长期气体作用下焦煤微观孔隙特性研究
Study on Micro-pores Characteristics of Coking Coal Under Long-term Gas Action
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摘要: 通过研究煤在长时气体氛围作用下,山西焦煤孔隙结构的演化规律,定性描述了三轴应力及气体吸附后焦煤的孔隙演化特征,为煤层气的开采以及煤矿瓦斯安全从微观方面给出理论依据;焦煤的孔隙结构特征采用高压压汞实验结合扫描电镜SEM的方法,实验测得吸附性气体N2长期作用后山西焦煤试样对比原焦煤试样:孔比表面积提高了27.8%,孔容降低了10.6%;非吸附性气体He长期作用后山西焦煤试样对比原焦煤试样:孔比表面积降低了21.9%,孔容提高了76.6%。结果表明:吸附性气体主要对焦煤孔隙结构中微孔、小孔产生影响;非吸附性气体主要对焦煤孔隙结构中中孔、大孔、可见孔产生影响;吸附性气体的吸附作用在一定程度会降低气体孔隙压对孔隙的扩张作用。Abstract: By studying the evolution law of coal pore structure under the action of long-term gas atmosphere, this paper qualitatively describes the pore evolution characteristics of coke coal after long-term adsorption of gas, and gives guidance for micro-environmental aspects of coalbed methane mining and coal mine gas safety. The pore structure of coking coal is characterized by high pressure mercury injection test and SEM. After measuring the adsorption gas N2, the Shanxi coking coal sample was compared with the original coking coal sample: the specific surface area of the hole increased by 27.8%; the pore volume decreased by 10.6%. After the non-adsorbing gas He acts, the Shanxi coking coal sample is compared with the original coking coal sample: the specific surface area of the hole is reduced by 21.9%, and the pore volume is increased by 76.6%. The results show that the adsorptive gas mainly affects micro-pores and pores; non-adsorbed gases mainly affect meso-pores, macro-pores and visible pores. The adsorption of the adsorptive gas will reduce the pore expansion of the pores to a certain extent.
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Keywords:
- pore structure /
- adsorption /
- mercury intrusion /
- pore pressure /
- SEM
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