Abstract
This study covers the long-term measurements and applications done between 15 January 2015 and 21 October 2016 in the Kozlu Colliery, one of the five collieries of Turkish Hardcoal Enterprise (TTK), Zonguldak, Turkey. It intends to address the practical problems encountered with the gas and air velocity sensors used in underground coal mines, and attempts to justify the accuracy of sensors. It also aims at determining the correct locations of the gas and air velocity sensors within cross-section of mine entries. Moreover, air densities were calculated to interpret the positions of individual gases within the mine air. The results showed that the infrared CH4 sensors used in the mine do not accurately measure CH4 concentrations at their current locations. Moreover, they are affected by relative humidity and thus necessitate more frequent calibration at places having high relative humidity. The air velocity sensors used in the mine are completely ineffective in their current state. Changing their locations led to better yet ineffective results. It was found that a correction factor of 1.25 is needed to correct air velocity sensor readings. It was concluded that air velocity, CH4 and CO sensors must be installed to points where air flow is higher, considering the Amagat's law. [Received: October 17, 2017; Accepted: April 4, 2018]
Published Version
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