jbw5306_mine.doc - Measuring Air Flow in a Mine Tunnel John...

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Measuring Air Flow in a Mine Tunnel John Worthley, [email protected], 27 August, 2017 Abstract Ventilation systems push methane and gaseous hydrocarbons out of mine shafts by driving outside air in towards a mine shaft and filtering out all the air by dilution. The goal is to dilute the explosive mine shaft gases to levels below those that could trigger explosions, destroy lives, and thus prevent mining productivity. For this study, air flow rates were taken at 3 locations with different cross-sectional areas of 19.9 ft 2 ,21.9 ft 2 , 22.1ft 2 . The three different fan settings were 5 Hz, 8Hz, and 11Hz. The air flow rates were determined by both a mechanical, error-prone 4-inch anemometer and a less error-prone, digital anenometer . The average volumetric flow rates of the 3 locations at 5 Hz were 5087.8 ft 3 /min, 3216.4 ft 3 /min, 2924.6 ft 3 /min. At a fan setting of 8 Hz the average volumetric flow rates of the 3 locations were 4372.0 ft 3 /min, 7664.7 ft 3 /min, 7626.7 ft 3 /min. Lastly, at 11 Hz the volumetric flow rates of the 3 locations were 13916.7 ft 3 /min, 6241.5 ft 3 /min, 7172.0 ft 3 /min. The air flow in the mine shaft was decreased due to friction from bends, turns, and obstructions in the mine shaft corrider. In contrast, real world mine shafts do not have as simple as a layout. They will have dozens of corriders, bends, turns, and areas that could be prone to feared dead spots, areas that see no ventilation and put miners at extreme risk of death. By installing a dependable ventilation system, a mining shaft operation could run securely, safely, and reduce the risk of costs. Introduction Quickly and remotely calculating the ventilation status is of great importance when making crucial decisions by mine personnel and evac teams. 1 The ability to provide adequate ventilation to structures such as longwall are tremendous milestones towards the success of an installation, especially in gassy circumstances. 3 Hazardous gases such as coal mine methane must be captured because its removal is vital to the reduction of dangerous emissions as methane is much more destructive than CO2. 4 In order to ensure great enough airflow to effectively dilute gaseous hydrocarbons to below harmful levels, we have discovered that various air flow measurements at varying frequencies are required to determine fan settings at various locations. Given a certain mine shaft’s layout constraints due to irregular walls and air flow blockers, the optimal fan speed can be determined. The goal is to define the optimal air flow settings given a mine shaft’s constraints in layout and irregular dimensions. From evaluations such as these, specific
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  • Spring '14
  • MATHEWS,JONATHAN

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