sqb5362_mine.doc - Air Flow Measurements in a Mine Tunnel...

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Air Flow Measurements in a Mine Tunnel for Ventilation Analysis Simon Balean, [email protected], 03 September, 2017 Abstract Ventilation measurements help mine tunnel developers provide safe, functioning, and sustainable underground mining operations. Data collected by air flow measurements allow mine developers in the mining industry to optimize working conditions and fan placement to create optimal working conditions for every specific mining operation. The specific mining conditions of every locations influence how a mining operation builder will build a mine. Today, mine tunnel fans feed fresh outside air into distributed and connected mining tunnels. Mine tunnels fans push methane and other harmful hydrocarbons out by driving out concentrated mine air with powerful high-speed fans. Mine tunnel gases are pushed out of the mine by controlled dilution. The goals are to dilute the mine tunnel gas levels to those below explosion-capable levels and to maintain high mining productivity levels. To aid mine developers, this study measured air flow at three separate locations with cross-sectional areas of 21.9, 22.0, 22.0 ft 2 . The three fan frequency settings were 5, 8, and 14Hz. The air flow rates were measured with both a mechanical 4-inch anemometer and a digital anemometer . The average volumetric flow rates at 5 Hz were 128, 285, and 417 ft 3 /min for the 3 locations. At the frequency fan setting of 8 Hz the average volumetric flow rates were 157, 217, 465 ft 3 /min for the 3 locations. Lastly, at 14 Hz the volumetric flow rates of the 3 locations were 160, 255, 410. The uncertainty of this data is that the averages are too far from each other. This lab does not have enough samples and runs. In the future, more runs and samples must be generated to come to a better conclusion based on more evidence. Uncertainties are abound due to poor air flow distribution from incorrect body placement, unwanted human interation with the anemometers, unwanted contact of the anemometer with tunnel walls, and abnormal anemometer movement across the cross- sectional areas of the tunnel. The data from this mine tunnel could also be due to friction from sharp bends and obstructions in the mine tunnel such as storage products from the Penn State University and other lab members. The data from this lab should be compared to the data from air flow measurements in other mine tunnels to analyze patterns in data caused by similar walls, bends, and lab-taking mistakes. This pooled data from multiple sources, lab teams, locations, and environments can be analyzed and used for locating the best places to place fans and how to best build mine tunnels to increase air flow, save lives, and ensure that mining operations are left working as often as possible. The implications are that mine tunnels will save as much as money as possible by being left to work as long as possible. The data suggests that mine tunnels should maintain fan operations so that mining operations do not have to spend money fixing the damage caused by explosions and deaths. The actions of mine builders and maintainers are to
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