| With the Chinese economic boom,the requirement for energy continues increasing.However,limited to China's energy storage conditions,coal in the next few decades will still be China's major energy sources.In the process of coal mining,gas outburst has always been the number one threat to coal mining in China.In the practice of large number of coal mining,it is found that there are also a lot of gas in the direct roof of some high gas coal mines.The gas emission in the goaf far exceeds the gas content of the directly falling coal,so the scholars put forward that the mudstone in the coal seam roof of the high gas coal mine may have certain gas adsorption and desorption performance.In order to reveal the influence of gas adsorption and desorption characteristics of such roof on gas emission,this project was carried out.According to previous research,a research of gas adsorption and desorption properties of mudstone.Through experimental research,theoretical analysis and experimental study of gas adsorption and desorption in coal seam and coal seam roof,comparative study on adsorption desorption characteristics of coal seam roof mudstone under different pressure in different moisture conditions.The article groundbreaking the study has a certain guiding significance.This paper consisting four chapters:(1)This paper describes the situation of the exploitation of coalbed methane,and the status of CBM exploitation in China,and introduces the research status of gas adsorption and desorption at home and abroad,and describes the purpose of studying this paper.(2)The gas adsorption theory is introduced,and the coal gas adsorption desorption test is carried out.In two kinds of particle gas adsorption and desorption experiment of coal sample size,the size of a large coal adsorption and desorption of less than the small particle size of coal adsorption desorption.(3)Gas adsorption and desorption experiment of coal seam roof mudstone.In three rock samples,there is a certain gap between different roadway of same size and shale gas adsorption capacity,the gas adsorption properties of mudstone roof with certain geographical differences.In the samples with different particle sizes,rock rock adsorption particle adsorption small size is larger than the diameter of the particle desorption.On the whole,the adsorption desorption adsorption of mudstone is far less than coal desorption,under the same conditions,the adsorption amount of mudstone only accounts for 0.32 of the total adsorption amount?(4)The influence of water on the shale gas adsorption and desorption,compared to the different rock roadway,different size,different pressure,adsorption and desorption characteristics under different moisture conditions,analyzes and summarizes the general rules of shale gas adsorption and desorption of mudstone.Always in the first set of pressure,the adsorption rate is linear,with the increase of gas pressure phase adsorption amount is reduced,but the overall cumulative adsorption amount increased.The adsorption desorption of all water samples were reduced,the water will restrict the shale gas adsorption and desorption.Although the experimental design operation there are still some shortcomings,but through analyzing the test data,summed up the characteristics of gas adsorption and desorption properties of mudstone,the enriched gas adsorption and desorption in blank field,with scientific significance. |
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