Study on the influence of mining conditions on the occurrence law of CO in coal seams with low metamorphic grade

摘要

The CO emission during the coal mining process is easy to cause the index gas prediction method to be out of alignment. Through the self-developed gas constant temperature desorption experiment device, combined with FLAC simulation, the influence of mining conditions on the occurrence of CO is studied. The results show that the mining stress can affect the occurrence of CO by affecting the permeability of coal. The coal seams not affected by mining have the same tendency to desorb the primary CO as the coal seams affected by mining. The desorption process of primary CO is fitted by Matlab and its content in lignite is mathematically analyzed. The results show that the desorption process of primary CO is consistent with the binomial exponential fitting and contains about 380 mL of native CO per ton of lignite.