Affiliation:
1. School of Resource & Environment and Safety Engineering Hunan University of Science and Technology Xiangtan Hunan China
2. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Xiangtan Hunan China
3. National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling Chongqing China
4. China Coal Technology Engineering Group Chongqing Research Institute Chongqing China
5. State Key Laboratory of Strata Intelligent Control and Green Mining Co‐founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China
6. China Coal Technology Engineering Group Shenyang Research Institute Shenyang Liaoning China
7. College of Safety Science and Engineering Xian University of Science and Technology Xian Shanxi China
8. College of Civil Engineering Hunan City University Yiyang Hunan China
Abstract
AbstractPore difference characteristics and adsorption/desorption experiments of primary coal with different degrees were explored to study the characteristics of pore structure and gas desorption. The results show that the pore volume increases with the increase in the degree of metamorphism. In primary coal with different degrees of metamorphism, the distribution of micropores, small pores, and medium‐sized pores (by volume) is WY < PM < CY. The distribution of large pore volume and visible pore volume was WY > PM > CY. According to the pore volume distribution law of different metamorphic primary coals, the average pore diameters of WY, PM, and CY were 68.40, 45.60, and 30.50 nm, respectively. The porosity and specific surface area of primary coal with different degrees of metamorphism show a distribution pattern such that WY > PM > CY. For large pore and visible pore, the pore volumes of WY, PM, and CY coal were 0.0785, 0.0587, and 0.0300 mL/g, respectively, and the proportions were 81.86%, 74.49%, and 55.25%, respectively. The porosity of WY, PM, and CY were 11.57%, 9.03%, and 6.57%, respectively, and the specific surface areas were 6.917, 5.826, and 5.611 cm3/g. According to the desorption characteristics of coal bodies with different metamorphic degrees at different time nodes found that the gas desorption at different time nodes shows similar changes under the same adsorption equilibrium pressure. The higher the degree of coal metamorphism, the greater the amount of gas desorption, and the faster the desorption amplitude. The desorption intensity of WY coal is significantly higher than that of PM and CY coal with the increase of desorption time which also verifies the measurement results of pore structure and adsorption constant.
Funder
National Natural Science Foundation of China
Subject
General Energy,Safety, Risk, Reliability and Quality
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