Abstract
When there are installations of air velocity sensors in the mining industry for real-time airflow monitoring, a problem exists with how the monitored air velocity at a fixed location corresponds to the average air velocity, which is used to determine the volume flow rate of air in an entry with the cross-sectional area. Correction factors have been practically employed to convert a measured centerline air velocity to the average air velocity. However, studies on the recommended correction factors of the sensor-measured air velocity to the average air velocity at cross sections are still lacking. A comprehensive airflow measurement was made at the Safety Research Coal Mine, Bruceton, PA, using three measuring methods including single-point reading, moving traverse, and fixed-point traverse. The air velocity distribution at each measuring station was analyzed using an air velocity contour map generated with Surfer®. The correction factors at each measuring station for both the centerline and the sensor location were calculated and are discussed.
Highlights
As the lifeblood of a mine, ventilation provides fresh air for personnel to breathe and dilutes and carries away toxic or explosive gases and dust
A comprehensive airflow measurement was made at the Safety Research Coal Mine, Bruceton, PA, using three measuring methods including single-point reading, moving traverse, and fixed-point traverse
The Safety Research Coal Mine (SRCM), Bruceton, PA, at the Pittsburgh Mining Research Division (PMRD) of the National Institute for Occupational Safety and Health (NIOSH) has an atmospheric monitoring systems (AMS) equipped with eight monitoring stations to collect real-time underground environment data for research purposes, including air velocity, carbon monoxide, temperature, oxygen, etc
Summary
As the lifeblood of a mine, ventilation provides fresh air for personnel to breathe and dilutes and carries away toxic or explosive gases and dust. Most of the real-time airflow sensors obtain a fixed-point air velocity at designated installation locations. The fixed-point air velocities need to be converted to average volume airflow rates to be used in ventilation design and ventilation performance evaluations. The Safety Research Coal Mine (SRCM), Bruceton, PA, at the Pittsburgh Mining Research Division (PMRD) of the National Institute for Occupational Safety and Health (NIOSH) has an AMS equipped with eight monitoring stations to collect real-time underground environment data for research purposes, including air velocity, carbon monoxide, temperature, oxygen, etc. The fixed-point air velocity monitoring data from the airflow sensors are frequently required to be converted to average volume airflow rate to analyze and evaluate the ventilation performance.
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