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14. Axial Fans in the Deep: Ventilation Challenges in Mining and Tunneling
Ventilation is an absolute necessity and a primary safety concern in underground operations such as mining, tunneling, and subterranean construction[9]. Toxic gases (like methane and carbon monoxide), dust particles, and web page the heat generated by machinery must be continuously removed and replaced with fresh, breathable air[11]. Axial fans are the preferred solution for this highly demanding application[11]. These fans, known as Mine Ventilation Fans or Auxiliary Mine Fans, are typically large-scale, heavy-duty Tubeaxial or Vaneaxial units designed to deliver massive volumes of air through long, restrictive ductwork that runs hundreds or thousands of meters underground[18]. Since the system resistance (static pressure) in such long ducts is high, these fans must be engineered for high-pressure capability[18]. Often, multiple fans are installed in series (booster fans) along the length of the tunnel to incrementally raise the pressure and maintain the required airflow velocity[11]. A crucial feature is the need for reversible axial fans, which can quickly change the direction of airflow to clear smoke and fumes in the event of an emergency, such as a fire, facilitating emergency egress and rescue operations[23]. The reliable, continuous operation and high-pressure capability of these specially built axial fans are literally life-saving, making them one of the most mission-critical pieces of equipment in the deep-earth environment.
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