6. Study of Gas Sampling Equipment and Methods in the Mine Fire Area

The chapter begins by discussing the importance of gas sampling during the closure of mine fire areas, highlighting the role of differential pressure measurements and the impact of atmospheric pressure on gas sampling accuracy. It then delves into various gas sampling instruments such as portable gas detectors, detection tubes, optical interference gas detectors, and infrared and laser gas sensors, outlining their advantages and limitations. The chapter also covers the basic principles of gas sampling and analysis in mine fire areas, emphasizing the importance of following specific sampling principles to ensure accurate representation of the fire zone environment. Additionally, it discusses common indicator gases used to determine the combustion status of coal and the challenges associated with gas sampling in complex environments. The chapter concludes with a case study of the Datong coalfield in Shanxi Province, analyzing the impact of atmospheric pressure and temperature on gas sampling and providing insights into effective gas sampling measures and methods.