Kinetic characteristics of desorption and diffusion in raw coal and tectonic coal and their influence on coal and gas outburst

被引：65

作者：

Guo, Haijun ^{[1
,2
,3
]}

Yu, Yingjie ^{[1
,2
]}

Wang, Kai ^{[1
,2
]}

Yang, Zhe ^{[1
,2
]}

Wang, Liang ^{[3
]}

Xu, Chao ^{[1
,2
]}

机构：

[1] China Univ Min & Technol Beijing, Beijing Key Lab Precise Min Intergrown Energy & Re, Beijing 100083, Peoples R China

[2] China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China

[3] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China

来源：

FUEL | 2023年 / 343卷

基金：

中国国家自然科学基金;

关键词：

Raw coal; Tectonic coal; Composite coal seam; Gas desorption; diffusion characteristics; Coal and gas outburst; PORE STRUCTURE; ADSORPTION; SORPTION; MINES;

D O I：

10.1016/j.fuel.2023.127883

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The basic physical parameters and gas desorption characteristics of raw coal and tectonic coal composite seams in northern China were tested, and the gas diffusion kinetic characteristics of raw coal and tectonic coal were investigated. The difference in gas hazard between the raw coal seam and tectonic coal seam was analysed based on this. The results found that: under the same conditions, the adsorption capacity, initial gas discharge rate, accumulated gas desorption volume, initial gas desorption rate and effective diffusion coefficient of tectonic coal are higher than those of raw coal, while Protodyakonov's coefficient of tectonic coal is much smaller than that of raw coal. This, together with the lower permeability of tectonic coal seam, easily leads to the formation of a gas enrichment zone in tectonic coal seam easily and triggers coal and gas outburst when the external stress environment changes. Under the same conditions, raw coal is more sensitive to changes in initial gas adsorption equilibrium pressure, and the development of cleats and fractures of raw coal is higher than that of tectonic coal, which makes the gas in the area of raw coal easier to extract than that in the area of tectonic coal. When carrying out gas control in the composite coal seam of raw coal and tectonic coal, it is necessary to consider the gas desorption and diffusion characteristics in the raw coal and tectonic coal and to develop precise coal seam gas control measures based on the principles of safety and economy. The results of this study are of great relevance to the prevention and control of coal and gas outburst disasters in raw coal and tectonic coal seams to ensure the safe and efficient mining of coal resources.

引用

页数：9

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