Atmospheric monitoring systems in underground coal mines revisited: a study on sensor accuracy and location
by Kemal Baris; Yusuf Aydin
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 23, No. 3, 2020

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]

Online publication date: Fri, 13-Mar-2020

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