MINE VENTILATION
Gaining air time
Ventilation on Demand solutions form part of a package of digital , automation and electrification technologies that , when deployed together , can transform underground mines into safer , more efficient environments , ABB says
The integration of hardware and software continues to make a difference to the ventilation processes at underground mines , Dan Gleeson reports
As the mining industry continues to prioritise productivity and sustainability , new-generation smart ventilation fans are playing a crucial role in helping mines achieve their safety and production targets , according to Chris McCabe , Electrical Business Unit Manager , Becker Mining Australia .
In this regard , the introduction of Becker Mining Australia ’ s latest 200 kW smart auxiliary ventilation fans stands out . Designed and manufactured in Australia , the innovative design , advanced technical features and operational advantages set a new benchmark in underground ventilation systems , it says .
Traditionally , ventilation systems operate at a constant rate , irrespective of the actual flow required . However , Becker Mining Australia ' s smart auxiliary fan systems integrate seamlessly into mine networks via Wi-Fi and fibre optics , according to the company . This allows the end user to optimise air flow in real time based on operational activities to enhance efficiency and safety .
Equipped with advanced sensors and data processing capabilities for real-time monitoring , mines can monitor critical parameters including temperature , vibration , motor current , air flow and pressure . The results are processed by the PLC and displayed locally on the fan ’ s interface and in real time via the mine ' s SCADA system to allow remote monitoring and preventative maintenance scheduling .
The semi-autonomous capabilities of Becker Mining Australia ’ s smart ventilation fans can detect blockages or lack of air flow , prompting automatic shutdowns or alerts , the company says . This provides the capability to prevent operations from continuing without the proper ventilation .
“ When integrated with the Becker Mining SmartFlow™ system , it provides feedback and information remotely in real time , allowing the end user to adjust air flow based on factors such as occupancy , equipment usage and environmental changes to ensure efficient ventilation ,” McCabe says .
As the underground mining sector knows , ventilation control is critical for optimal air quality and safety in these environments .
Becker Mining ’ s smart auxiliary ventilation fans employ Variable Inlet Vanes ( VIV ) for precise air volume adjustment . Additionally , the fans are equipped with an air dilution valve ( ADV ) designed to dilute plugs of methane gas that may accumulate in ventilation tubes following fan stoppages , further mitigating potential safety hazards .
A solid centrifugal impeller , coupled to a flameproof 1,000 V AC motor positioned outside the air stream , ensures optimal performance in all ( Group I Zone I ) underground coal environments . The VIV guides air flow onto the impeller , optimising ventilation efficiency , while the ADV ’ s robust design prevents damage from debris passing through the fan , McCabe says . Accessibility features such as the stone drop-out box , accessible from either side of the ADV , enables debris removal during operation , ensuring continuous and effective air flow management without interruption , the company states .
“ By optimising air flow distribution , the fans
contribute significant cost savings over its operational lifespan , reducing operational expenditures associated with ventilation systems ,” McCabe says .
With a 200 kW capacity , Becker Mining Australia ’ s auxiliary ventilation fan is the largest capacity fan in the industry , the company claims . Its ventilation and static pressure capabilities allow operators to extend ventilation tubing lengths , accommodating larger and longer setups without sacrificing static pressure or ventilation efficiency at the face . “ This translates into tangible operational benefits , including the ability to accommodate more personnel and equipment at the working face , ultimately leading to improved production capabilities and faster progress underground ,” McCabe says .
In addition to real-time monitoring and semiautomation capabilities , Becker Mining Australia fans are mechanically engineered for reliability and longevity , according to the company .
The aero foil design employed for its latest 200 kW impeller fan achieves an airflow of 25 m 3 / s and maximum pressure performance of 9.3 kPa . This innovative design , combined with solid fan blades and a reinforced steel subframe , minimises the risk of damage from foreign objects and ensures stable operation even in the most challenging conditions .
The narrow frame of Becker Mining ’ s auxiliary fans addresses a common operational challenge encountered in many underground operations , allowing the fan to fit alongside conveyors and other confined spaces to optimise space usage , without compromising performance . “ The adaptability of the design allows for various modifications and installation options , including skid , track , monorail and wheel mounting , catering to diverse operational requirements ,” McCabe says . “ The enclosures can also be reached from either side of the machine , offering
22 International Mining | JUNE 2024