Shuohao Li , Songwei Wu , Bo Wang , Jiyuan Zhang , Liang Wang
{"title":"水分应力约束下低阶烟煤内部瓦斯解吸和扩散研究","authors":"Shuohao Li , Songwei Wu , Bo Wang , Jiyuan Zhang , Liang Wang","doi":"10.1016/j.fuel.2024.132320","DOIUrl":null,"url":null,"abstract":"<div><p>Gas extraction is one of the primary methods for guaranteeing secure coal mining and the effective use of high-quality energy. It is crucial to study the CH<sub>4</sub> desorption and diffusion pattern of low-rank bituminous coals under moisture and stress conditions. Because in low-rank bituminous coals, moisture in the coal will occupy the adsorption position and diffusion channel of methane (CH<sub>4</sub>), affecting the efficiency of coalbed methane extraction. Herein, low-rank bituminous coals with varying moisture contents were prepared using the salt solution method, and their physical characteristics were described. CH<sub>4</sub> desorption characteristics were investigated across particle and lump coal to analyze the impact of moisture, adsorption equilibrium pressure, and confining pressure. The applicability of the unipore and time-varying diffusion models in elucidating CH<sub>4</sub> diffusion characteristics was evaluated. The small-molecule models of low-rank bituminous coals with different moisture contents were established using the molecular simulation method, which was also used to conduct diffusion kinetic simulations to characterize the diffusion behaviors. Finally, the mechanism of moisture, confining pressure, and adsorption equilibrium pressure on CH<sub>4</sub> desorption and diffusion properties were investigated. The findings can serve as a theoretical foundation for estimating the risk of coal and gas outbursts and guiding methane extraction management in low-rank bituminous coal mines.</p></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation of desorption and diffusion of gas within low-rank bituminous coal under moisture-stress constraints\",\"authors\":\"Shuohao Li , Songwei Wu , Bo Wang , Jiyuan Zhang , Liang Wang\",\"doi\":\"10.1016/j.fuel.2024.132320\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Gas extraction is one of the primary methods for guaranteeing secure coal mining and the effective use of high-quality energy. It is crucial to study the CH<sub>4</sub> desorption and diffusion pattern of low-rank bituminous coals under moisture and stress conditions. Because in low-rank bituminous coals, moisture in the coal will occupy the adsorption position and diffusion channel of methane (CH<sub>4</sub>), affecting the efficiency of coalbed methane extraction. Herein, low-rank bituminous coals with varying moisture contents were prepared using the salt solution method, and their physical characteristics were described. CH<sub>4</sub> desorption characteristics were investigated across particle and lump coal to analyze the impact of moisture, adsorption equilibrium pressure, and confining pressure. The applicability of the unipore and time-varying diffusion models in elucidating CH<sub>4</sub> diffusion characteristics was evaluated. The small-molecule models of low-rank bituminous coals with different moisture contents were established using the molecular simulation method, which was also used to conduct diffusion kinetic simulations to characterize the diffusion behaviors. Finally, the mechanism of moisture, confining pressure, and adsorption equilibrium pressure on CH<sub>4</sub> desorption and diffusion properties were investigated. The findings can serve as a theoretical foundation for estimating the risk of coal and gas outbursts and guiding methane extraction management in low-rank bituminous coal mines.</p></div>\",\"PeriodicalId\":325,\"journal\":{\"name\":\"Fuel\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.7000,\"publicationDate\":\"2024-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fuel\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0016236124014686\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fuel","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0016236124014686","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Investigation of desorption and diffusion of gas within low-rank bituminous coal under moisture-stress constraints
Gas extraction is one of the primary methods for guaranteeing secure coal mining and the effective use of high-quality energy. It is crucial to study the CH4 desorption and diffusion pattern of low-rank bituminous coals under moisture and stress conditions. Because in low-rank bituminous coals, moisture in the coal will occupy the adsorption position and diffusion channel of methane (CH4), affecting the efficiency of coalbed methane extraction. Herein, low-rank bituminous coals with varying moisture contents were prepared using the salt solution method, and their physical characteristics were described. CH4 desorption characteristics were investigated across particle and lump coal to analyze the impact of moisture, adsorption equilibrium pressure, and confining pressure. The applicability of the unipore and time-varying diffusion models in elucidating CH4 diffusion characteristics was evaluated. The small-molecule models of low-rank bituminous coals with different moisture contents were established using the molecular simulation method, which was also used to conduct diffusion kinetic simulations to characterize the diffusion behaviors. Finally, the mechanism of moisture, confining pressure, and adsorption equilibrium pressure on CH4 desorption and diffusion properties were investigated. The findings can serve as a theoretical foundation for estimating the risk of coal and gas outbursts and guiding methane extraction management in low-rank bituminous coal mines.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.