Australian Mine Ventilation Conference

Aria

Publish date: 21 Giugno 2024

The Australian Mine Ventilation Conference provides an opportunity to promote safe ventilation practices in mines. By sharing and disseminating knowledge gained from operations across the industry, we can help meet the demand for raw materials right here in Australia.

The Australian Mine Ventilation Conference is organised by AusIMM, the Australasian Institute of Mining and Metallurgy and has been running since 2011. The AusIMM committee calls on the knowledge and expertise within the mining industry, including academia, regulators and researchers. Each year, the Australian Mine Ventilation Conference showcases new and exciting innovations across various aspects of mine ventilation.

Underground ventilation in mining

Underground ventilation systems are a key component in the management of mine risks. These measures effectively control various activities, such as monitoring air quality to ensure a healthy working environment. Statutory ventilation offers in Australia’s coal and metalliferous mines are now required by law. The statutory function of the ventilation officer is to control and manage the ventilation activities and standards forming a part of the mining operations at the mine.

The re-emergence of pneumoconiosis in miners is one way that dust can cause damage to your lungs. It’s an occupational lung disease, meaning you are likely going to encounter these particles only while at work and not outside on walks or other activities where they may be present naturally. Over the past few years, significant developments in practice and research have helped ensure we maintain safety levels within our underground mines. These and other factors should provide an incentive for underground operators to contribute strongly to the Australian Mine Ventilation Conference.

Australian Mine Ventilation Conference

The 2024 Australian Mine Ventilation Conference will be held in Sydney from August 11th – 15th. This event brings together operators, equipment manufacturers and suppliers, consultants, government regulators and mining personnel to discuss strategies & technologies to improve mine ventilation. This event aims to promote safe ventilation practices to help improve the overall productivity and safety of mines in Australia and around the world.

Minetek is an exhibitor at the upcoming Australian Mine Ventilation Conference, showcasing our sophisticated and innovative underground ventilation technology. We’ve provided modular air management solutions to industry leaders around the world since 1984. Our deep domain engineering expertise enables mining operators to achieve safe, reliable operations while delivering guaranteed reductions in costs and increased profitability. Visit us at the Australian Mine Ventilation Conference to learn more about Minetek’s ventilation technology and innovative advancements.

Underground ventilation fan technology

Minetek’s ventilation fans have an innovative anti-still chamber, controlling the flow of air, capturing turbulent airflow and unstable pre-swirls. This technology eliminates critical stalls and has been proven to extend the operating range and overall performance of the fan across the entire curve.

Coupled with our Mine Air Control (MAC) system, you can seamlessly integrate with the operating layer of the underground mine to optimise airflow across the entire circuit. This enables operators to ramp up or down airflow, based on scheduling and vehicle movements, providing performance on-demand ventilation. Tailor pressure and power consumption without the need for VSD control, helping to reduce ventilation power costs and increase overall efficiency.

At Minetek we understand that unique scenarios require unique solutions. We manage all aspects of the project from end to end. Including the initial consultation, design and engineering, development, removal of old equipment, installation, commission, training, maintenance and ongoing servicing.

Aria

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Ventilation fan requirements for underground mining

Publish date: 20 Giugno 2024

Metals and minerals are essential to our everyday lives. No matter the product – from the cement we talk on, to the computer screen we work on, all items depend on mining production today for our society function as we know it.

Mining has been an integral part of human history since ancient times when people first began exploring below ground level looking at what they could find down there. Cave-ins, explosions, and extreme temperatures are some of the most perilous hazards observed in underground mining. Underground mining ventilation, however, is the most critical safety aspect in the operation of an underground mine.

The aim of underground ventilation

Metropolitana mining ventilation aims to control the environment by providing enough air to dilute and remove contaminants such as dust, diesel fumes, heat, and bad air. There are many types of ventilation fans used in mining depending on the size and scale of the operation, but all fans work to do the same thing – keep miners safe while they’re working.

Air pollution remains a prevalent issue for miners, with many at risk of developing a lung disease called pneumoconiosis. This can occur when miners are exposed to airborne respirable dust for long periods of time, leading to potential impairment, disability, and in extreme cases premature death.

Confined spaces, minimal ventilation and underground vehicle emissions can all compromise air quality underground. The main objective of an underground ventilation system is clear: provide air flows in sufficient quantity and quality to dilute contaminants to a safe amount.

Ventilation requirements are governed by government regulations in many countries. In QLD Australia, the Coal Mining Safety and Health Regulation 2017 sets out the requirement for a ventilation plan while also giving guidance on how to achieve an effective ventilation system.

The key to an effective underground mining ventilation system is good planning and design. By understanding all the potential hazards and mapping out a ventilation plan that takes these into account, miners can be sure they are safe while they work.

Underground mining poses hazards, including the build-up of methane and other gases along with limited oxygen. Without proper ventilation, this could result in explosions and multiple fatalities. Gas build-up must be monitored closely with evacuation and shut down procedures in place until the levels subside.

Air ventilation can dilute and remove toxic and potentially explosive gases. It is also necessary for regulating the temperature inside the mine. Temperature levels in underground mines range from extremity-numbing cold to such heat that can cause dehydration in a matter of minutes by profusely sweating.

It’s not just humans that are negatively affected by becoming sluggish in extreme heat or cold. Machines can overheat, freeze, or stop working in harsh environments. Even the support structure of the mine can become compromised in these conditions, leading to warping and collapse.

Primary & secondary underground ventilation fans

There are two main types of ventilation used in underground mines: primary and secondary. Typically primary fans are typically located at the surface while secondary fans are located underground. The main difference between primary and secondary ventilation is the size of the fan and the amount of air that is being moved. Primary ventilation is typically used to move a large volume of fresh air into the mine while secondary ventilation is used to help circulate the air that is already underground.

Efficient ventilation is critical for production and energy efficiency, with ventilation alone contributing between 42% and 49% of a typical mine’s energy cost. Minetek’s innovative engineering has resulted in groundbreaking features that can deliver economic savings, durability and flexibility simply not possible with traditional fans.

The flexible airflow using the Performance On Demand (POD) system can ramp up or down, accommodating changes in activity throughout the life of the mine. Coupled with the Mine Air Control (MAC) system, Minetek’s fans automatically track vehicles moving into the heading and adjust the airflow accordingly. The system is controllable from the surface above and allows synchronisation of the entire ventilation system.

Primary fan ventilation

Primary ventilation is the main airflow that is used to dilute contaminants. It is typically delivered through large, powerful fans that are located at the surface and blow fresh air into the mine. The basis of any adequate underground ventilation is the adequacy of the primary ventilation system. This is the total mine air volume flow through the significant underground workings, typically splitting into parallel circuits. Unlike conventional fans or competitors, Minetek’s primary ventilation ensures power saving, durability, and flexibility while guaranteeing a Return on Investment (ROI).

Secondary fan ventilation

Secondary ventilation is used to help circulate air that is already underground, supplementing the primary airflow. It typically does not move as much air as primary ventilation and is delivered through smaller fans that are located underground. Secondary fans ventilate the development ends, stopes and services facilities that constitute secondary circuits tapped off the primary circuit or main through the flow of air. These headings are typically ‘dead-end’ configurations and may have multiple parallel headings where airflow is unavailable.

Although secondary ventilation is not as critical as primary ventilation, it’s essential to manage airflow and temperature in specific areas of exploration. Minetek’s Secondary Axial fans are compact, 40% shorter, and 10% lighter than standard fans with low-profile ducting. The high-pressure capability of Minetek’s High Output (HO) axial fan is more than double of traditional fans of comparable size. This results in fewer fans needed overall, reducing overall ventilation power consumption.

Minetek’s Secondary Fans models cater to both impulse-bladed and vane axial versions. The concentrated power of Minetek’s High Output (HO) Axial Fans makes them the ideal solution for long duct runs. Complimented by the need for only a single duct run, PLC screen surface control and the bonus of being able to surge the fan past the critical duty point to clear gases and dust for fast re-entry make Minetek the ideal choice.

Underground ventilation requirements

It is the responsibility of the site’s mine manager to ensure that a plan of the ventilation system of the mind is kept at the mine. This helps to communicate the direction, course, and volume of air currents, as well as the position of all air doors, stoppings, fans, regulators, and ventilating devices, in the mine. Managers must understand the impact the following factors have in determining the effectiveness of the ventilation planning process:

- Underground mine plan and schedule

- Mine design and method

- Airflow modelling

- Development of ventilation plans and schedules

- Diesel equipment

- Naturally occurring and man-made contaminants

The manager of the mine must also ensure that the following ventilation requirements are met:

- The supply of air for any ventilating equipment used underground is obtained from the purest source available.

- The recirculation of air within any secondary ventilation circuit is maintained at the minimum level that is practicable.

- Where practicable, contaminated return air from any secondary ventilation circuit is exhausted directly to the primary return air exhaust system.

The use of underground fans is controlled by an approved system that will ensure the mechanical integrity of the fan and its associated ducting. All mine workings, plants, and equipment located within any ventilation circuit are Certified as explosion-proof. All air doors are constructed and installed in accordance with the requirements specified in the door schedule.

Importance of underground ventilation in mining

Maintaining good ventilation underground is critical to the health and safety of miners. It is also important for managing temperature and air quality. Minetek’s primary, secondary, booster, bulkhead, long duct and development ventilation fans are designed to meet the specific challenges of underground mining ventilation. Our underground mining ventilation solutions are compact, durable, and flexible while guaranteeing a return on investment.

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Secondary mine ventilation design

Publish date: 20 Giugno 2024

Secondario mine ventilation has been hamstrung by the availability of fans that satisfy many competing operational factors. The sometimes legislated requirement of adequate volume to the working face, the minimisation of excavation required to fit the selected secondary fan and the power requirements of various operational phases have, in the past, not been satisfied with just one system. The new system being introduced overcomes all these competing requirements in one simple unit with an added bonus of being very durable without loss of performance when wear occurs on the impeller.

Existing operational situation

Several studies have found that between 42% and 49% of mining energy costs are associated with mine ventilation, depending on the type of mine and the equipment used. If we then look at the general breakdown of installed power of the secondary fan to primary vent fans, the ratio is around 2:1. Thus the total energy costs of the secondary ventilation represent about 25% of the overall mining energy costs. It is of interest to note that the cost of running a typical two-stage axial vs the cost of purchasing and general maintenance cost of the same fan over a 10-year period, the breakdown will be conservatively in the order of 40:1.

The currently available secondary ventilation axial fan has one duty curve at any given time. Generally, this can be changed manually within the motor power parameters but requires a minor outage and removal of the fan to do the pitch adjustments.

As the bag vent ducts grow longer, the supplied air reduces to a point where inadequate air is supplied to the working face. This is exacerbated by underground equipment putting additional resistance in the heading and further reducing the supplied air at the working face. This shortfall is normally corrected by the installation of an additional fan in the system to overcome losses in the bag system but comes at a cost of production as the heading needs to be shut down to install the second fan. This also means that the heading is supplied with excessive air on the shorter runs with wastage of fan power.

Variable Speed Drives in their various forms increase the range of duties but this is limited and overspeed is usually not possible for a Standard axial impeller. There are many downsides to installing a fan with a Variable Speed Drive, as has been highlighted in a paper3 showing major fatigue issues with varying speeds of the fans. Other issues include that VSDs are generally considered unreliable in underground environments and require cooling whilst maintaining their IP cabinet rating. The heat load of the variable speed drive has also to be accounted for. The other main downside is that altering the speed of an impeller may lead to the excitation of an impeller or blade natural frequency which will result in a very premature failure of the fan.

Impact on secondary ventilation costs & compliance

Commonly underground trucks have a rated flywheel power of greater than 560 kW (751 hp). That combined with a loader power of 350 kW (470 hp) has increased the secondary ventilation requirement. Using the common rule of 0.05 m3/s of air per kilowatt of rated engine power for compliance4, this equates to 45 m3/s (95000 cfm) of air required in an area where a truck is being loaded. To achieve this with a traditional 1400 mm (55”) vane axial fan requires two stages and outlet pressure of lower than 2500 Pa. That is equivalent to having less than 150 m of 1400 mm (55”) standard duct installed on a twin 110 kW (147 hp) fan. This also assumes no holes in the duct. However, in most mines, it is not possible to run 1400 mm duct into an ore drive and therefore it is reduced to 1220 mm (48”). This, combined with leakage, has proven to be a constant problem for the industry.

Most secondary fans are running with outlet pressures well above 3500 Pa (0.5 psi). A twin 110 kW fan running at 3500 Pa consumes 190 kW and produces about 42 m3/s at the fan outlet and 40 m3/s at the face. That is 5 m3/s away from being compliant. A twin 90 kW fan running at 3500 Pa consumes 165 kW and produces about 38 m3/s at the fan outlet and 35 m3/s at the face. That is 10 m3/s away from being compliant. A fan consuming 190 kW with an electricity price of 15 c/kWh will cost $249,660 per year to run. That is a lot of money to pay and still be more than 11-30% away from compliance. An average mine has about 15 secondary fans. That’s total consumption of $3,744,900 per year, and still not compliant by more than 10%.

Secondary ventilation solution

The High Output Axial fan is designed with the mining industry in mind. Its high-pressure steel fabricated impeller is at the forefront of technology and allows for operation at pressures previously thought impractical for an axial fan. Additionally, prolonged life of the impeller in even the harshest environments is achievable compared with traditional axial fans.

The fan is supplied with a Performance On Demand (POD) system fitted to the inlet of the fan. It allows the fan to be regulated from very low flow requirements right through to more than double the duty point of a traditional vane axial fan.

The POD device offers a new level of control over secondary vent fans that have only previously been partially available with expensive and high-maintenance variable speed drives. The Performance On-Demand system allows the fan operation to be altered if the resistance is changed for any reason. This will ensure all working areas still receive the required airflow. Additionally, the POD can be opened up for blasting and can increase the airflow by up to an additional 30 m3/s, this can result in re-entry times being greatly reduced giving a direct economic impact. The Performance On-Demand controller is regulated on start-up for vent bag inflation, therefore soft starters are not always required. Bump starters are also not required.

After designing the new Minetek patented High Output Axial fan, it was very quickly realised that significant additional benefits could be realised with a level of automation. The thought that a loader operator would stop and change the fan settings, as well as open and close valves, was flawed. Therefore, the Mine Air Control (MAC) system was designed to bring the fan system together with complete automation.

Minetek Mine Air Control (MAC) system

The MAC system consists of a smart controller in each fan starter panel that controls the output at each heading. To achieve this, it receives signals from the flow meters and uses regulators to alter the flow at the face. The whole MAC system is designed to default to a preset flow at any given heading.

The MAC System receives a signal from a tracking system to alert of any machinery entering a heading. However, the default for any active heading is to have a small nominal flow above the amount required for personnel to enter the heading. This ensures its safe and allows machinery to drive straight into the heading. Without this nominal flow, machinery would need to wait at the entry to evacuate any fumes or gas. A simple RFID tracking system can be used or integrate with a pre-existing system.

Looking at the previous costs and introducing a typical timeline for activities in a development heading, the High Output Mine Air Ventilation system will supply over 50 m3/s at 400 m when required but only consume a total of about $118,493 in power per year for the given typical activities for a development heading. Given the average mine total of 15 secondary twin 110 kW fans, the saving in power would be $1,967,505 per year.

The system is simple when used in declines or single headings. All that is required is a flow meter near the face and controlling the POD to ensure the correct amount of air is delivered for the equipment in the heading.

When we introduce more headings things start getting more complex, with different equipment in different headings and the system pressure increasing and decreasing as the equipment regulates different headings. Using an RFID system, the patented regulation system of all the headings becomes straightforward to manage, as each piece of equipment has an assigned value to it and thus demand is controlled and the fan raises and reduces load based on the real time demand in the mine.

Below are various multi heading scenarios possible with Minetek Air fans.

High output axial fan for secondary ventilation

The Minetek High Output Axial Fan have other advantages compared with the market place standard Ø1400mm (55”) twin axial fans. The Minetek fan generates up to 11 dB less noise than a Ø1400 twin 110kW for the same volume flow. The overall diameter of the Minetek fan is slightly smaller than a Ø1400 twin stage axial but is 40% shorter in length and 10% lighter. It is also installed in the same way as all secondary mine vent fans.

Conventional axial fans can suffer greatly from wear on the blades. Just a 1 mm reduction in the blade nose due to wear can have a significant effect on the high-pressure portion of the fan curve. This then translates into a reduced stall point and thus the chance of failure due to stall is increased as the duct lengths get longer. The Minetek High Output Axial is not affected by wear on the blades and will perform to original duty points without adjustment.

The Minetek High Output Axial Fan will save money on operation and ensure compliance with any regulatory requirements. The Minetek High Output Fan has a very large operating range compared to a standard axial fan offering and thus is very versatile for underground mine operations.

References

- 1. Benchmarking the Energy Consumption of Canadian Underground Bulk Mines, Canadian Industry Program for Energy Conservation (CIPEC). ISBN 0-662-39539-5, Cat. No. M144-71/2005E, 2005.

- 2. Investigation of Current Research Related to the Reduction of Energy Usage in Mines Through Recycling, Reuse and Other Means, LCG Energy Management Group, May 2009.

- 3. Fatigue Implications for fans with Variable Speed Drives, K.J. Lownie & R. Bourcier, 13th United States/North American Mine Ventilation Symposium, 2010 – Hardcastle & McKinnon (Eds.), © 2010, MIRARCO

- 4. Ventilation requirements for diesel equipment in underground mines – Are we using the correct values?, Adrian Halim, 16th North American Mine Ventilation Symposium, June 2017, ed Jurgen F. Brune

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Understanding fan performance curves

Publish date: 20 Giugno 2024

The role of fans in maintaining the air quality and safety of underground mines cannot be overstated. These ventilation systems are indispensable in providing a constant flow of fresh air, preventing the build-up of toxic gases, and protecting workers from respiratory ailments. In addition to their critical role in maintaining air quality, fans also play a vital role in keeping mining equipment cool and operational. Any downtime in production can result in significant financial losses, making optimal fan performance essential.

Selecting the right fan is a crucial decision that demands careful consideration. However, not all fans are created equal, and their performance can vary greatly depending on various factors, such as diameter, speed, and blade pitch angle. This is where the concept of a fan curve comes in, providing an invaluable graphical representation of a fan’s performance and the relationships between its key parameters. By leveraging this information, mining operators can confidently select the right fan, safeguarding worker safety and the mine’s productivity.

What are fan performance curves?

Fan performance curves are a powerful tool that visually represents a fan’s ability to move air at different flow rates and pressures. Understanding these curves is crucial in selecting the most suitable fan for a specific application and operating it with peak efficiency.

Fan performance curves are typically plotted on a graph with volume flowrate and pressure as the two axes. Fan curve families have multiple curves depicted on the one graph, showing how the fan’s airflow and pressure change in response to various operating conditions. Each curve will represent how the fan’s airflow and pressure change in response to various operating conditions, including different diameters, running speeds, densities and impeller configurations.

When selecting a fan, it is paramount to consider both the flow rate and pressure requirements to determine the appropriate operating point where the system’s airflow resistance and the fan’s pressure capabilities intersect. This point indicates the actual flow rate the fan will produce at the given pressure.

Moreover, fan performance curves also aid in troubleshooting and diagnosing problems with the fan’s performance. Tracking the operating point makes it possible to identify issues such as clogged filters, closed dampers, or pressure, leading to a state of stall by exceeding the fan’s design capacity. Correcting these issues ensures efficient fan operation, avoids potential damage to the motor or fan down time.

Fan performance curves are a valuable resource for selecting the most appropriate fan for a given application, optimising its performance, and diagnosing issues that may arise during operation. Engineers and technicians can ensure that fans operate at their best by leveraging the power of fan performance curves, maintaining efficient airflow and pressure to achieve optimal system performance.

Key terminology to know when reading a fan performance curve

Reading a fan performance curve can be challenging, but it is a critical skill for efficiently selecting and operating a fan. Understanding the three primary parameters, namely static pressure (Pa or in.wg), volume flowrate (m³/s or CFM), and power (Kw or BHP), and their relationships is essential in interpreting fan performance curves.

Volume flowrate

Volume flowrate is a metric that measures the fan’s capability to generate air movement at different static pressure levels, which is typically displayed on the x-axis of the fan’s performance curve. In the United States, this is typically quantified in cubic feet per minute (CFM), while the internationally recognized unit of measurement for air volume flow rate is m³/s. The value of a fan is profoundly influenced by the speed at which it operates and the size of its awe-inspiring impeller blades, both of which play crucial roles in its exceptional performance.

Static pressure

Static pressure refers to the resistance that air encounters as it flows through a system, such as a duct or a filter. This pressure is exerted on the walls of the system and is quantified in inch water gage (in.wg). In the context of a fan’s performance, the static pressure (SP) value is typically illustrated on the y-axis of the performance curve. Higher SP values correspond to greater resistance in the system, resulting in lower m³/s values.

Potenza

Fan power is a crucial metric that quantifies the output of power required to propel a fan to its maximum potential. In the United States, this metric is conventionally measured in brake horsepower (BHP or HP), while kilowatts (kW) are the standard unit of measurement in most other regions such as Canada and Australia. The HP or Kw value reflects the optimal amount of power that the fan requires to achieve its designated speed and performance level.

Operating point and application

The operating point represents the intersection of the volume flowrate and SP values on the performance curve, corresponding to the conditions under which the fan operates. The application of the fan, such as ventilation, cooling, or extraction, determines the required operating point. To select the appropriate fan for an application, it is necessary to identify the operating point and match it with the fan’s performance curve.

What is stall, and why do they occur?

Measuring these different components, such as volume flowrate (CFM), static pressure (SP), and brake horsepower (BHP), can provide critical information for keeping the system running efficiently and preventing costly fan stalls.

Fan stalls occur when the airflow through a fan is disrupted or reduced to the point where the fan blades no longer have enough air to work against. This can be caused by a variety of factors, including changes in the system resistance due to dirty air filters or ductwork, incorrect fan speed settings, or inadequate maintenance.

The consequences of fan stalls can be severe, both in terms of energy efficiency and overall system performance. When a fan stalls the state of performance reduces and may trip on vibration, over temperature or other safeties – leading to the fan stopping, causing a complete loss of ventilation or cooling, which can be detrimental to the health and comfort of occupants in the vicinity. Additionally, when a fan stalls it can cause damage to the fan motor, impeller and bearings, reducing the lifespan of the equipment and leading to costly repairs or replacements.

Measuring the CFM, SP, and BHP of a ventilation system can help identify potential issues before they lead to fan stalls. Monitoring these components regularly makes it possible to detect changes in system performance and take corrective action before they escalate. For example, if the CFM value drops below the expected level, it may indicate a blockage or obstruction in the ductwork that needs to be cleared.

Plotting a fan performance curve

At Minetek, we pride ourselves on our ability to deliver exceptional fan solutions to our mining clients. We achieve this by creating a fan performance curve customised to the specific duty point required by the mine. This involves a meticulous selection process, where we carefully consider the client’s needs and select a fan that meets those needs and provides excellent value.

We offer an extensive range of primary and secondary fans, each with unique specifications and capabilities, ensuring that our clients can find a fan that is perfectly suited to their requirements. Our fan options range from 90kw all the way up to 1,110kw, providing a broad selection of solutions to choose from.

This is an example of a fan performance curve. Minetek, with its pioneering POD technology, boasts an expansive operating range that extends to the far reaches of the red area. Competitor fans, however, are constrained by a meagre operating range. Minetek fans, on the other hand, exhibit unprecedented versatility and can operate at peak performance levels across an extensive range of static pressures and airflows.

Minetek’s fan performance

Primary / Booster Fan range

Minetek’s Primario / Booster Fan Range boasts an extraordinary range of exceptionally high-performance fans meticulously designed to cater to the highly specialised needs of underground mining sites.

- Power range 200 – 2,700 HP / 150 – 2,000 kW

- Volume 106,000 – 2,119,000 CFM 50 – 1000 m3/s

- Pressure 200 – 27 in.wg / 200 – 8000 Pa

- Efficiency > 85%

Secondary / Auxiliary Fan range

Minetek’s Secondary/Auxiliary Fan Range presents an extensive array of fans precisely designed to meet the unique and specific demands of underground mine sites.

- Power range 120 – 500 HP / 90 – 375 kW

- Volume 22,120 – 211,900 CFM / 10 – 100 m3/s

- Pressure 0.80 – 27 in.wg / 200 – 6500 Pa

- Efficiency > 85

The benefits of Minetek’s High-Output Axial Fan

At Minetek, we strive to deliver cutting-edge ventilation technology through world-class engineering, intensive research and development, and breakthrough technology. Our underground ventilation technology is the pinnacle of innovation, providing unparalleled economic, operational, and safety benefits unmatched anywhere else in the world.

Minetek’s mine ventilation system features underground fans that enhance airflow and eliminates power wastage in underground mining applications. This remarkable system utilises a patented Mine Air Control (MAC) technology that enables the Performance on Demand (POD) units to sense the required airflow in any heading at any given time, maximising their performance. The system’s high-pressure, steel-fabricated impeller technology allows for operation in temperatures, and conditions once thought impossible for an Axial Fan.

The Axial Fan’s key feature is its POD system, which comprises an electronic controller that enables the fan to be regulated from low flow requirements to over double the duty point of a conventional vane axial fan, resulting in significant cost savings. The MAC System RFID trackers play a critical role in its cost-efficiency, continuously monitoring the movement of underground mining equipment and automatically adjusting the air volumetric flow to provide sufficient ventilation for the area and disperse the gases.

Minetek’s revolutionary anti-stall chamber is a feat of engineering, expertly regulating air movement by capturing turbulent airflow and unstable pre-swirls. This ingenious technology eliminates critical stalls and improves the fan’s operating range and overall performance, providing unparalleled outcomes for underground mining sites.

This modular system is custom-engineered and manufactured in Australia to meet the end user’s specific needs, making it a highly reliable and adaptable solution for various underground mining applications.

Contact us today to learn more about our underground ventilation solutions and how we can help you achieve optimal performance.

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Mine safety and the dangers of poor ventilation

Publish date: 20 Giugno 2024

Miniere is a notoriously dangerous profession, and underground mines are particularly hazardous environments. Every year, miners are injured and killed in accidents that could have been prevented with improved or adhered to safety measures. To ensure the safety of workers, mine operators must follow mine safety and inspection regulations to provide adequate ventilation. One key element of underground ventilation is the fan or ventilazione sotterranea system, which helps to circulate fresh air throughout the mine. This article discusses the importance of safety in mining and the dangers of poor ventilation in underground mining.

Underground ventilation systems need to be monitored closely in line with mine safety and inspection regulations as broken fans can be a source of danger if not properly maintained. Broken fans or inadequate ventilation systems can create pockets of stagnant air which can lead to a deadly build-up of methane gas.

One of the biggest dangers of an inefficient underground ventilation system is the risk of methane gas build-up. Methane is a colourless, odourless gas that is highly flammable. A build-up of methane can create an explosive environment and can lead to deadly accidents.

In addition to the risk of explosion, methane can also cause suffocation. When methane gas accumulates in an enclosed space, it displaces oxygen and can cause people to asphyxiate. Therefore it’s essential that mine operators take care to provide adequate ventilation in their mines as a broken fan or an inefficient ventilation system can have deadly consequences for miners.

In addition to the dangers of inadequate ventilation, workers can also be exposed to excessive levels of noise from fans, which can cause permanent damage to their hearing over time. Research suggested that permanent hearing damage can occur if you are exposed to sound levels at 85 dB or more for prolonged periods of time. The louder the sound of the fan or underground ventilation system, the quicker it can cause damage.

Mine Safety Measures

Mines safety and inspection regulations are in place to help mitigate the risks of methane gas build-up and prevent deadly accidents on mine sites. Operators should provide adequate safety gear, such as gas detectors, helmets and dust masks. Training workers on how to identify pockets of stagnate air and build-ups of methane gas can also help to meet mine safety KPIs.

Mineworkers should be trained in how to identify and respond to signs of methane gas build-up. If workers detect a dangerous level of methane gas in the air, they should evacuate the mine immediately. Mine operators should have an evacuation plan in place, and workers should know what to do in case of an emergency.

There are additional safety measures mineworkers can take to ensure the ventilation system is working properly;

- Monitoring the ventilation system regularly to ensure it is functioning correctly

- Reporting any problems with the ventilation system to a supervisor immediately

- Wearing appropriate safety gear, such as gas detectors, helmets and dust masks

- Training workers on how to identify and respond to signs of methane gas build-up

Interested in learning more about Minetek’s underground ventilation capabilities? Contatto.

Minetek’s underground fans are engineered with the mining industry in mind. We have ventilation systems installed across the globe, with successful projects in snowy Alaska to the desert in Western Australia.

Our underground fan technology has a vast operating range for a single fan which is regulated by the integrated POD (performance on demand) system. The high-pressure fabricated steel impeller is at the forefront of ventilation technology and allows for operation at pressures previously thought impossible for an axial fan. The on-demand energy efficiency features half’s the power consumption, saving 50% on operating costs. You have the ability to provide the correct amount of air when and where you need it.

The robust design ensures that the steel impellers are unaffected by blade wear helping to prolong the life of your fan, in even the harshest environments. Our fans are also designed to be low noise, so they don’t cause hearing damage as some other fans can.

Mining can be a dangerous profession, therefore it’s essential that mine operators provide PPE, follow safety and inspection regulations and have adequate ventilation in their mines. Minetek’s solutions help to improve mine safety and ensure safe operations.

Interested in learning more about Minetek’s underground ventilation capabilities? Contatto.

Minetek Underground Fans & Ventilation

Minetek’s underground fans are engineered with the mining industry in mind. We have ventilation systems installed across the globe, with successful projects in snowy Alaska to the desert in Western Australia.

Our underground fan technology has a vast operating range for a single fan which is regulated by the integrated POD (performance on demand) system. The high-pressure fabricated steel impeller is at the forefront of ventilation technology and allows for operation at pressures previously thought impossible for an axial fan. The on-demand energy efficiency features half’s the power consumption, saving 50% on operating costs. You have the ability to provide the correct amount of air when and where you need it.

The robust design ensures that the steel impellers are unaffected by blade wear helping to prolong the life of your fan, in even the harshest environments. Our fans are also designed to be low noise, so they don’t cause hearing damage as some other fans can.

Mining can be a dangerous profession, therefore it’s essential that mine operators provide PPE, follow safety and inspection regulations and have adequate ventilation in their mines. Minetek’s solutions help to improve mine safety and ensure safe operations.

Interested in learning more about Minetek’s underground ventilation capabilities? Contatto.

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Mine ventilation insights and innovations

Publish date: 21 Maggio 2024

After years of COVID-19, online seminars and virtual conferences, the in-person Mine Ventilation Conference organised by AusIMM came as a welcome change and demonstrated an engaged and growing market. There was an above-average turn-out of Mining managers, underground ventilation specialists, engineers, consultants, and ventilation solution providers at this Australian Mine Ventilation Conference. Key personnel from twelve countries, met for five days to discuss the latest in ventilazione sotterranea innovation and safety.

Covering both coal and metalliferous underground operations, speakers covered many topics with a focus on innovation and technology, examining the past, and looking to the future. Key themes explored technology with discussions around how it can be implemented in underground mining for safer and more efficient ventilation. Ideas like Minetek’s POD (Power on Demand) system were examined, as POD automated systems have been shown to drastically reduce operating costs for ventilation fans, by decreasing or increasing output to meet the needs of the mine site.

These themes demonstrate that a characteristically risk-adverse industry is growing, evolving, and adapting to utilise innovative technology, as the need for operational savings, safety, and for efficient, automation processes increase. The market has identified a growing need for quality airflow and optimisation of technology to deliver reliable air. This adaption to technology is encouraged by changes in Government Legislation like the recent changes in Western Australia. On 31 March 2022, the Work Health and Safety (WHS) laws replaced the health and safety elements of the Mines Safety and Inspection laws.

“Minetek has been excited to meet with industry experts and highlight our fans. We pride ourselves on not only performance and innovative technology, but our ability to understand unique project needs. We deliver a premium service, customised solutions, and responsive delivery that only a small, passionate, and incredibly hardworking team can deliver.”

– Matt Ryan, Minetek Air

Mine Ventilation Solutions

Minetek is internationally recognised as an innovative mining solutions provider. Facilitating commercially and environmentally sustainable outcomes for mining companies, whilst enabling safe, compliant, and profitable operations.

Word class engineering capabilities
Leaders in automation, technology, and customised solutions
Servicing underground mines world-wide
Control targeted air supply with no VSD (Variable Speed Drive) required
Power, performance and pressure on demand
Fan power range from zero load to full load
Savings in ventilation power consumption, up to 60%
Automated or manual ventilation configuration

Minetek’s POD device offers a new level of control over primary & secondary vent fans that has only previously been partially available with expensive and high maintenance variable speed drives. The POD system allows the fan operation to be altered as the demand or resistance is changed within the underground mine. This ensures all working areas receive the required air flow, at the lowest cost.

The future of underground ventilation

With projections estimating the global mine ventilation market is set to reach USD $401 million by 2024, combined with the recent announcement of Sydney hosting the International Mining Ventilation Conference in 2024, the ventilation community of Australia is in a prime position for future growth and innovation [1].

Industry surveys suggest that Australia has the highest penetration of innovative technologies across mine sites; with drones, mine management software, autonomous and remotely controlled vehicles at the forefront [2]. More than 77% of jobs within Australia’s mining sector will be improved by innovative technological advancements, increasing productivity by up to 23% [3]. Our adoption and innovation of smart technology assists with mine planning, collision avoidance and predictive maintenance for equipment and technology.

Mine site technologies at the forefront of investment;

Mine planning software
Mine communication systems
Predictive maintenance for mobile equipment
Battery / electric vehicles
Fatigue detection
Drones
Predictive maintenance for plants
Fully autonomous vehicles
Wearable technology
3D printing
Automation
Robotics

This positions Australia as the leading adopter of modern technology aiding future growth and innovation within the mining industry.

At Minetek we understand that unique scenarios require customised solutions. We manage your project from end to end, including the initial consultation, design and engineering, development, removal of old equipment, installation, commission, training, maintenance, and ongoing servicing.

References

Research and Markets – Global Mine Ventilation Markets, 2019-2024 – Leading (globenewswire.com)
Global Data – https://www.mining-technology.com/comment/australia-lead-mining-technology-adoption/
Mining Technology – https://www.mining-technology.com/sponsored/why-australia-is-leading-the-way-in-mining-technology-adoption/

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Minetek attends North American Mine Ventilation Symposium

Aria

Publish date: 21 Maggio 2024

The 2023 North American Mine Ventilation Symposium (NAMVS) and expo was held at South Dakota Mines University in Rapid City, South Dakota from Saturday June 17^th to Thursday June 22^nd. The industry event attracted ventilation professionals and manufacturers from across the United States and the world, providing a platform for exchange of new ventilation practices, innovation, and research. Organised by the Society for Mining, Metallurgy & Exploration Inc. (SME) and South Dakota Mines, NAMVS covered a broad variety of topics including mine ventilation planning, ventilation design, main and booster fans, auxiliary ventilation, and mine dust control.

This year, Minetek was a platinum sponsor and exhibitor at NAMVS, proudly supporting this peer-reviewed symposium. The event was a great opportunity for those in the underground metal and coal industry to promote and share fresh ideas and research to improve the performance and safety of mine ventilation.

Our attending Minetek Air representatives Jeremy Sutherland and Simon Bird were excited to join the mine ventilation discussion. As a globally recognised solutions provider of underground ventilation solutions, Minetek Air was eager to share the incredible innovation and technology utilised within our fans to improve safety, compliance, and profit for our clients.

Underground ventilation and the race to net zero emissions targets.

For almost 40 years Minetek Air has been delivering innovative, technology driven underground ventilation solutions. We help our clients achieve safe operations, regulatory compliance, reduced power consumption and increased profitability. In the race for mining operations worldwide to meet net zero emissions targets, reevaluating your ventilation system has never been more crucial. Up to 35% of today’s mining emissions can be attributed to Scope 2 non-renewable electricity generation and consumption, with 42% of underground mine electricity consumption attributed to ventilation systems and processes.

Reducing power consumed by on-site ventilation systems is an enormous step forward on the journey to net zero carbon emissions. Minetek’s sophisticated underground ventilation fans are proven to reduce power consumption by up to 50% with the unique ability to tailor pressure, power and performance with no fan stalls, no loss of air and no Variable Speed Drive (VSD) controls.

Missed out on NAMVS 2023?

If you weren’t able to attend this year’s event, please visit our NAMVS webpage to download our brochureware, book a call with Minetek Air’s USA representative, and read more about our underground ventilation solutions.

Aria

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Maximising mine ventilation efficiency

Publish date: 21 Maggio 2024

In the dynamic landscape of underground ventilation, innovation and technology play a pivotal role in ensuring compliance, productivity, profitability and above all, safety.

Minetek, a global leader in mining solutions, stands at the forefront of this technological evolution delivering a range of underground ventilation fans and accessories able to halve required power consumption costs and ensure compliance.

In this article, we delve into Minetek’s groundbreaking Underground Ventilation Technology, exploring the capabilities, applications and features of Minetek’s High Output Axial Fan Series and supplementary Mine Ventilation Louvres designed to work together in maximising airflow efficiency throughout the entire mine.

Minetek’s high output axial fan series

Engineered to excel in the demanding mining environment, Minetek’s High Output Axial Fan series redefines underground ventilation with its key features. The fan showcases a robust design, featuring a steel-fabricated impeller specifically designed for prolonged life in harsh mining environments. Proving its ability to ramp airflow up and down as needed, the fan has been demonstrated to reduce power consumption costs by up to 50% whilst simultaneously surpassing the performance of traditional larger fans. Adding to its versatility, these compact units can also be easily redeployed as mine workings evolve, providing a flexible and efficient solution for the dynamic needs of mining operations.

Minetek’s High Output Axial Fan Series comes with a multitude of advantages, making it a game-changer in the mining industry. With a vast operating range, this single-speed fan features Minetek’s Performance On Demand (POD) system, eliminating the need for Variable Speed Drive (VSD) controls. The robust design, equipped with wear-resistant blades, ensures durability in harsh mining environments. Minetek’s innovative approach simplifies ventilation processes, doing away with complex and costly Ventilation On Demand (VOD) controls, while also eliminating fan stalls for a safe and reliable solution. Furthermore, the fan’s efficiency contributes to a reduction in capital costs, as fewer fans are required for optimal performance.

High Output Axial Fans have a number of applications including Primary Fans, Booster/Intake Fans, Development Fans, Multiple Heading Ventilation, Secondary/Auxiliary Fans, Bulkhead, Long Duct Runs and Tunnel Fans.

Mine Air Control (MAC)

Minetek’s Mine Air Control (MAC) system seamlessly integrates into the mine’s operating layer, optimising airflow across the entire circuit. This innovative system adjusts air flow based on scheduling and vehicle movements, providing true performance on demand.

Performance on demand (POD)

Minetek’s POD technology enables operators to tailor pressure and power consumption without the need for Variable Speed Drives (VSDs). The system, controlled by fan vane inlets, optimises performance, reduces power consumption costs, and enhances overall operational efficiency.

Anti-stall Technology

Minetek’s anti-stall chamber revolutionises fan performance by capturing turbulent air flow and unstable pre-swirls. This technology eliminates critical stalls, extends the operating range, and enhances overall fan performance across the entire curve.

Extend mine efficiency further with Minetek louvres.

Designed to further maximise airflow efficiency throughout the entire mine, Minetek’s Underground Ventilation Louvres are a cost-effective solution able to be used in conjunction with primary fan, secondary/auxiliary fan, booster/intake fan, bulkhead, multiple heading ventilation and tunnel fan applications.

Minetek’s Underground Ventilation Louvres stand out in the mining industry, able to significantly reduce capital expenditure by maximising airflow and therefore minimising the need for additional fans.

Additionally, Minetek Louvres also contribute to lowering operating expenditure and serve as an integral component of fire management systems, enhancing safety measures within the mining environment. The low-maintenance design ensures hassle-free operation, adding to their appeal, and with Ventilation On Demand (VOD) capabilities, these louvres offer the flexibility to further adjust airflow based on operational needs. Moreover, mine sites can choose between manual and remote and local automated options, providing adaptability to suit diverse mining requirements.

To learn more about Minetek’s Mine Ventilation Louvres, download the product brochure here.

Ventilazione sotterranea innovativa

Minetek stands as a global leader in delivering innovative and cost-efficient air solutions tailored for the mining industry. Leveraging our cutting-edge POD technology, operators can accurately manage pressure and power, optimising airflow circuits without the necessity of Variable Speed Drive (VSD) control. The seamless integration with Ventilation On Demand (VOD), mine communication systems and ancillary products like Minetek Louvres provides a responsive solution, optimising performance, reducing power consumption costs, and enhancing overall operational efficiency.

Committed to aiding our clients in attaining sustainable ventilation management outcomes, Minetek offers a comprehensive range of solutions tailored to meet the unique needs of your mining operations.

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How Minetek Air is helping America’s net zero mining mission

Publish date: 23 Aprile 2024

The mining industry is undergoing a seismic shift towards sustainability, driven by global concerns over climate change and environmental impact. Worldwide, mining jurisdictions are formulating decarbonisation strategies in response to the Paris Accord, which holds nations accountable for their contributions to climate change and will directly impact mining companies.

Canada has pledged to achieve net zero emissions by 2050, while Australia, though not yet committed to net zero, is indicating an imminent shift as it aims for zero emissions as swiftly as possible, preferably by 2050. South Africa targets net zero emissions by 2050, and China aims to peak emissions before 2030 and achieve carbon neutrality by 2060, according to President Xi Jinping. Meanwhile, great strides are being made towards achieving net-zero mining in the United States.

The past few years have seen ambitious climate action from the United States. The Biden administration has set targets to cut greenhouse gas emissions in half by 2030 and reach net zero by 2050.

Recent legislative measures, such as the Inflation Reduction Act, Bipartisan Infrastructure Law, and proposed EPA regulation to accelerate electric vehicle adoption, position the United States as a leader in advancing sustainable mining practices globally.

American mining companies must seize this momentum towards net-zero mining by integrating sustainable practices into their operations. This involves transitioning to renewable energy sources, embracing efficient resource management techniques, employing advanced technologies to curb emissions and waste, and collaborating with innovative solution providers such as Minetek Air.

In today’s article, we will explore the demand for sustainable mining practices, the importance of future-proofing mining operations, and the potential contributions of companies like Minetek.

The journey to net-zero

America’s mining legacy is deeply ingrained in its history, tracing back to the nation’s earliest days of exploration and settlement. From the frenzied days of the California Gold Rush, where dreams of striking it rich lured prospectors from far and wide, to the rugged coal mines of Appalachia, which fuelled the nation’s industrial revolution, mining has left an indelible mark on the landscape of American economics and infrastructure.

With nearly 787,924 people directly employed in the sector and accounting for nearly 15 per cent of the total U.S. GDP, the mining industry has been a vital driver of economic growth and development, providing livelihoods for countless families and laying the groundwork for the nation’s prosperity. However, as we enter a new era of environmental consciousness and sustainability, the mining industry faces unprecedented challenges and opportunities.

While the global mining industry accounts for approximately 4% to 7% of worldwide greenhouse gas emissions, it will also play a key role in transitioning to a low-carbon economy. As society demands cleaner and more sustainable practices, mining companies must adapt to remain competitive and minimise their environmental impact. This shift towards sustainability not only aligns with global efforts to combat climate change but also presents opportunities for innovation, efficiency gains, and long-term resilience. Therefore, integrating sustainable practices into mining operations is not only a moral imperative but also a strategic necessity for continued success.

Mine-workers-ensure-safe-and-efficient-operations-with-proper-ventilation

America’s changing regulatory landscape and environmental compliance

The U.S. mining industry is set to play a crucial role in facilitating the transition to a green economy by supplying critical minerals. Currently, China holds a significant dominance, processing over 80% of all rare earth elements, more than 60% of cobalt, over 50% of lithium, and over 30% of nickel. Recognising the need to address China’s stronghold, the U.S. is actively seeking avenues to bolster domestic mining and processing capabilities.

Just last month, as part of President Biden’s Investing in America agenda, the U.S. Department of Energy (DOE) announced over $17 million for three projects aimed at supporting the establishment of facilities to extract rare earth elements and other critical minerals from coal-based resources. These projects, backed by the Bipartisan Infrastructure Law, have the potential to fortify domestic supply chains, meeting the escalating demand for critical minerals while reducing dependence on unreliable foreign sources. Producing critical minerals domestically will also allow the U.S. to maintain high standards and help meet the administration’s dual goals of creating good-paying American jobs and addressing climate change.

While this presents an opportunity for American mining companies, it also means that nearly every new mine in the United States will undergo rigorous review under the National Environmental Policy Act (NEPA), including developing Environmental Impact Statements. It is also important to note that the U.S. already has a network of strong environmental laws — including the Clean Air Act, the Clean Water Act, and the Resource Conservation and Recovery Act — which govern every aspect of a mine’s operation, require permits to be granted and provide for state regulator oversight of operations.

What is clear is that America is moving toward net-zero mining with a focus on sustainability and environmental responsibility. Minetek is ready to support mining companies in achieving the ambitious goal of reaching net-zero emissions with its innovative solutions while also maintaining compliance.

Minetek’s innovative solutions for sustainable operations

Minetek Air, a leading provider of industrial mining ventilation solutions worldwide, brings decades of expertise in assisting mining and industry leaders in achieving environmentally sustainable Underground Ventilation management outcomes, ensuring safe, reliable, and profitable operations.

Since 1984, Minetek Air has been delivering innovative, modular air management solutions tailored for underground miners. Our range is proven to boost productivity, cut operating costs, and offer the flexibility to regulate air delivery as per requirements. With a strong track record of engineering excellence established in Australia, Minetek Air is now ready to make a significant impact in the American mining sector.

Our High Output Axial Fan series is a sturdy and dependable underground ventilation fan with a wide operating range. Featuring an innovative steel fabricated impeller, it can operate at pressures previously deemed unattainable for an axial fan, ensuring a prolonged lifespan even in harsh environments. Minetek’s powerful single-speed fans have demonstrated up to 50% reduction in power consumption costs and improvements in underground mining ventilation systems. Compared to traditional larger fans, our compact units not only outperform larger alternatives but can also be swiftly redeployed to other locations as mine workings evolve.

Install-team-in-front-of-a-Minetek-Primary-and-Booster-Ventilation-Solution

While our Performance On Demand (POD) technology empowers operators to customise pressure and power consumption without requiring VSD control, seamless integration with all mining Ventilation On Demand (VOD) and mine communication systems provides a responsive solution that optimises performance, cuts power consumption costs and improves overall operational efficiency.

Minetek Air, with its extensive experience and innovative solutions, stands ready to support American mining companies in their transition towards sustainable and environmentally responsible operations. By delivering tailored underground ventilation solutions, we ensure that mining operations maintain their safety, reliability, and profitability while simultaneously minimising their environmental impact. With a proven track record of technological prowess and a commitment to excellence, Minetek Air is positioned to make a significant contribution to the American mining sector, assisting companies in achieving their objectives of reaching net-zero emissions.

Notizie e approfondimenti

Revolutionary underground mine ventilation technology

Publish date: 23 Aprile 2024

Since ancient times, the pursuit of extracting precious metals and minerals has driven miners to explore greater depths and risk their lives. From cave-ins, explosions, extreme temperatures, and high humidity to airborne dust and toxic gases, the underground environment poses significant risks to the health and safety of workers.

The modern mine site continues to undergo a drastic transformation as it embraces connected, automated, and innovative technology designed to improve safety, enhance operational efficiencies, maximise productivity and profitability, and secure long-term asset viability.

Despite the challenges and risks at stake, the demand for safe, reliable and efficient air supply underground remains a top priority in protecting miners. Like silica dust in construction and stone manufacturing, other lung diseases attributed to working below ground have forced mine operators to address air quality issues by adopting technology that mitigates these risks.

This is where underground ventilation systems play a critical role in controlling air quality by diluting and removing contaminants such as dust, diesel fumes, heat and toxic gases while regulating temperature and humidity levels.

Underground airflow & ventilation systems

Ventilation systems can also contribute to lowering a mine’s power consumption and emissions output by 30-50 per cent by switching to green electricity sources. Therefore, it’s no surprise the push toward achieving net-zero emissions targets and efforts to decarbonise and remain ESG compliant is driving asset owners to search for smarter ways to optimise airflow underground.

As pioneers in air ventilation, water management, sound attenuation, power supply and distribution, global industrial mining solutions provider Minetek has been known for introducing game-changing technology to the industry for over 30 years.

Having successfully delivered over 3,000 projects worldwide, the company’s air ventilation division Minetek Air is now synonymous with sophisticated modular air management solutions for underground mines that deliver the required airflow to all working areas at the lowest cost.

Engineered fans with mining in mind

Embracing agile ventilation technology assists operators in limiting airflow in parts of a mine with no scheduled activity, which reduces their energy consumption exponentially. Regarding world-class engineering, breakthrough technology, and intensive research and development, Minetek’s underground ventilation systems are the complete package.

It’s Primary Ventilation and Booster Fans are no exception. Primary (or main fans) are installed on the surface or below ground level in a bulkhead application and direct air into and out of a mine while removing contaminants in the process.

According to Minetek Air underground mining ventilation manager Jeremy Sutherland, the importance of selecting the right ventilation system in an underground mine can’t be overstated.

“Our ventilation fans were engineered to safely increase productivity, deliver cost savings, durability and flexibility not achieved with traditional fans,” said Mr Sutherland.

“Minetek’s primary fans suck air through a mine at 150 cubic metres per second, with the aim of replacing the air every 20-40 minutes. In larger or deeper mines, these fans can move between 450-900 cubic metres of air per second through their main decline with the support of booster fans or additional single return airways.

“Installing a booster fan in conjunction with the primary fan at the mine’s surface, helps increase air pressure of the ventilation passing through the air ducts, which can reduce pressure from the primary fan and provide the air pressures needed for deep underground mining operations.”

Secondary ventilation fans

Minetek’s Secondary (auxiliary) ventilation fans have also become a ‘fan favourite’ for mining operations wanting to effectively regulate airflow at greater depths. These secondary fans are used to supplement the primary ventilation system, particularly in deeper mines where airflow is stagnant.

Secondary fans essentially provide ventilation to development ends, stopes and services facilities that constitute secondary circuits tapped off the primary circuit or main through the flow of air.

Mr Sutherland says Minetek’s secondary fans are like no other on the market.

“They’re compact in size, 40 percent shorter and 10 percent lighter than standard fans, while the high-pressure capability of our high output axial fan is double that of standard fans comparable in size. This reduces the number of fans required, therefore minimising costs over the long-term, with low-profile ducting that makes installation more streamlined than other fans available.”

Minetek’s High Output Axial Fans incorporate a robust steel fabricated impeller designed for prolonged life and operation at pressures previously thought impossible, even in the harshest underground environments.

The concentrated power of these axial fans make them ideal for long duct-runs when operators need additional pressure to maintain airflow up to 1,500 metres, while minimising air volume loss across the vent line network. The fans can also surge past the required duty point to clear gases and dust for fast re-entry, increasing production and reducing capital costs over the mine’s lifecycle.

Sustainable fan performance & airflow on demand

It’s suggested that underground ventilation contributes 42-49% of a typical mine’s energy cost. With an increased focus on energy efficiency and ESG credentials, new innovations in ventilation technology are redefining how mining companies boost operational efficiencies and minimise power consumption.

Mr Sutherland highlighted that Minetek’s powerful single-speed primary and secondary fans had been proven to reduce power consumption costs by up to 50 per cent and improve underground mining ventilation systems.

“Compared to larger fans, our compact units outperform larger alternatives and can be re-deployed quickly and easily to other locations as mine operations evolve,” he said.

“The flexible airflow using our Performance On Demand (POD) system can ramp up or down, accommodating changes in mine activity, and only using as much power as required. This technology allows operators to tailor pressure and power consumption through our potentiometer without the need for Variable Speed Drive (VSD) controls.

“Our impulse-bladed impeller controls the POD system with anti-stall technology, which captures turbulent airflow and unstable pre-swirls to ensure optimal fan performance and prevent critical fan stalls.”

With the ability to integrate with all mining Ventilation On Demand (VOD) and mine communication systems, mines can benefit from lower power consumption costs and greater operational efficiencies.

When coupled with its Mine Air Control (MAC) system, Minetek fans provide a seamless, responsive solution that synchronises the entire ventilation circuit, allowing airflow from the fan to be controlled from the surface based on scheduling and vehicle movements identified using RFID trackers.

Contatto

Notizie e approfondimenti

Australian Mine Ventilation Conference

Underground ventilation in mining

Australian Mine Ventilation Conference

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