Observing Experiment and Analyzing Research of CO Occurrence in Original Coal Seam

Coal has a strong adsorption capacity, adsorbed gas in coal seam is mostly CO₂, CH₄ and N₂, only a little is CO. In upper corners and some other spots of mining face of some mine CO often transfinite, but due to being unclear about its source, fire preventing and controlling measures are often inefficient which directly threat safe production of coal mine. through determining and analyzing data of four site experimental boreholes in eastern 31 mining face of CUIJIAZHAI coal mine, content of CO contained by raw coal itself is found to be 0%~0.0019%, and with time develops, producing rate of CO slow down gradually, and concentration of CO increase with depth of borehole increase, so part of CO in mining face is concluded to stem from occurrence of original coal seam.