Research on Methane Measurement and Interference Factors in Coal Mines

Abstract

The detection of methane has always been an important part of coal mine safety. In order to improve the methane measurement accuracy in coal mines and to determine the influence of environmental interference factors on the measurement results, we designed a spherical, experimental chamber simulating the on-site environment of an underground coal mine containing methane, in which various environmental interference factors can be superimposed. The simulation chamber can generate a uniform and controllable dust environment, a controllable methane environment with concentrations below that which would trigger an alarm, controllable humidity, and environments characterized by other interference factors. Based on computational simulations of the experimental chamber with varying dust-particle-concentration distributions using a single particle size, an optimal design for the chamber has been realized in terms of the rapid mixing of dust and the flow field. Finally, we constructed an underground methane concentration measurement system for coal mines and assessed the influences of different dust concentrations and relative humidity values on the performance of methane measurements, providing a means for improving the measurement accuracy of underground coal mine, spectral, absorption-type methane sensors.

European Climate Policy in the Context of the Problem of Methane Emissions from Coal Mines in Poland

“…In addition to environmental benefits, the reduction in methane emissions enhances safety within coal mines [73]. Methane is not only a potent greenhouse gas but also poses a significant explosion risk in underground coal mines.…”

Intensity analysis of frictional heat source during core tube sampling and drilling

“…Therefore, the accuracy of the direct approach for determining the coalbed methane content is primarily dependent on the accuracy of the calculation of coalbed methane loss 15 . Sampling techniques for the direct method conclusion of CBM content consist primarily of core pipe sampling, twist drill pipe sampling, compressed air sampling, and negative pressure ejection sampling 16–18 . However, twist drill pipe sampling has the disadvantages of uncertain sampling location and inaccurate determination of desorption time.…”

“…15 Sampling techniques for the direct method conclusion of CBM content consist primarily of core pipe sampling, twist drill pipe sampling, compressed air sampling, and negative pressure ejection sampling. [16][17][18] However, twist drill pipe sampling has the disadvantages of uncertain sampling location and inaccurate determination of desorption time. Compressed air sampling has the disadvantage that fixed-point sampling cannot be performed.…”