甲烷吸附前后高阶煤煤岩孔隙结构变化特征研究
Change of pore structure for high rank coal before and after methane adsorption
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摘要: 为了查清甲烷吸附作用对煤岩孔隙结构的影响，对采集自西南多煤层地区的高阶煤开展了30 ℃、最大测试压力12 MPa的甲烷高压等温吸附测试，并对甲烷吸附作用前后煤岩的孔隙结构分别使用氮气探针和二氧化碳探针进行了测试。实验结果表明：高阶煤甲烷等温吸附在低压条件下表现出快速吸附的特征，过剩吸附量在达到最大值后下降；甲烷吸附作用后，煤岩低温液氮吸附滞后环减小，低温二氧化碳吸附量也减小，煤岩孔隙结构发生变化，煤岩中微孔、介孔和大孔的孔容和孔比表面积均下降，微孔孔容和孔比表面积下降明显，且不同孔径孔容、孔比表面积的减少具有分段效应，主要为孔径小于1 nm的微孔和孔径小于8 nm的介孔；高阶煤煤岩孔隙结构的改变与甲烷吸附作用中较高的测试压力有关。Abstract: In order to find out the influence of methane adsorption on the pore structure of coal rock, a high rank coal sample was collected from southwestern China, and the methane adsorption under 30 ℃ with the maximum measurement pressure of 12 MPa was carried out, and the pore structure of the coal sample before and after the methane adsorption was also investigated with the low-pressure nitrogen adsorption and low-pressure carbon dioxide adsorption. The experimental results show that the isothermal adsorption of methane from high-rank coal exhibits the typical characteristics of rapid adsorption at low pressure, and the excess adsorption of coal and rock decreases after the excess adsorption reaches the maximum value; after methane adsorption, the adsorption hysteresis loop of low temperature liquid nitrogen decreases, and the adsorption amount of low temperature carbon dioxide also decreases, indicating that the pore structure of coal rock changes after methane adsorption; after methane adsorption, the pore volume and specific surface area of micropores, mesopores and macropores in coal rocks all decreased, especially the micropores and specific surface area decreased obviously, and the decrease of pore volume and specific surface area of different pore sizes has segmentation effect, which is mainly due to the decrease of pore volume and specific surface area of micropores with pore size less than 1 nm and mesopores with pore size less than 8 nm; the change of pore structure of high rank coal is related to the higher test pressure of methane adsorption.
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