煤矿安全2025，Vol.56Issue(5)：9-19,11.DOI:10.13347/j.cnki.mkaq.20250163
压力和粒径影响下原生煤和构造煤非稳态扩散特性研究
Study on unsteady diffusion characteristics of primary coal and tectonic coal under the influence of pressure and particle size
摘要
Abstract
In order to further study the characteristics of gas desorption and diffusion in coal,the gas desorption and diffusion experi-ments of primary coal and tectonic coal with different gas pressures(0.8,1.3,2.4,3.3 MPa)and different particle sizes(0.074-0.250,0.250-0.500,0.500-1.000,1.000-3.000 mm)were carried out.The effects of pressure and particle size on gas desorption and gas de-sorption rate in primary coal and tectonic coal were discussed.The unsteady diffusion model of gas was established and the unsteady diffusion characteristics of coal samples were analyzed.The main conclusions are as follows:the gas desorption amount of primary coal and tectonic coal increases with the increase of pressure.The growth rate of gas desorption amount of primary coal with the in-crease of pressure is larger than that of tectonic coal,which leads to the decrease of the total gas desorption amount gap between the two.The gas desorption amount of primary coal and tectonic coal increases with the decrease of particle size.The decrease of particle size only changes the growth trend of gas desorption amount of primary coal,but does not change the growth trend of gas de-sorption amount of tectonic coal.The increase of pressure has little effect on the change of gas desorption rate of primary coal and tectonic coal.The decrease of particle size makes the change trend of gas desorption rate of primary coal change from fast to slow to rapid decrease,but does not make the change trend of gas desorption rate of tectonic coal change.The unsteady diffusion character-istics of tectonic coal gas diffusion coefficient change more obviously with the increase of pressure,while the diffusion characterist-ics of primary coal gas do not change much.The decrease of particle size can make the gas desorption and diffusion characteristics of primary coal change from steady state to unsteady state,and the decrease of particle size leads to the unsteady characteristics of gas desorption and diffusion of tectonic coal more obvious,but it does not change the essence of unsteady diffusion.关键词
非稳态扩散/瓦斯解吸/构造煤/解吸压力/煤样粒径Key words
unsteady diffusion/gas desorption/tectonic coal/desorption pressure/coal sample particle size分类
矿山工程引用本文复制引用
卢守青,檀鲁锐,秦玉金,撒占友,刘杰,张永亮..压力和粒径影响下原生煤和构造煤非稳态扩散特性研究[J].煤矿安全,2025,56(5):9-19,11.基金项目
国家自然科学基金资助项目(51804176,52374209,52474235) （51804176,52374209,52474235）
山东省自然科学基金资助项目(ZR2023ME031,ZR2023ME012,ZR2024ME025) （ZR2023ME031,ZR2023ME012,ZR2024ME025）
中国博士后科学基金资助项目(2019M652346) （2019M652346）
