Pore and gas desorption characteristics of primary coal with different degrees of metamorphism

被引：5

作者：

Chen, Yong ^{[1
,2
,3
,4
,5
,6
]}

Liu, Ronghua ^{[1
,2
]}

Wang, Gang ^{[5
,6
,10
,11
]}

Ma, Jinkui ^{[7
]}

Wu, Jiaokun ^{[3
,4
,8
]}

Wang, Pengfei ^{[1
,2
]}

Wu, Kuan ^{[9
]}

Guo, Xiaomin ^{[7
]}

机构：

[1] Hunan Univ Sci & Technol, Sch Resource & Environm & Safety Engn, Xiangtan, Hunan, Peoples R China

[2] Work Safety Key Lab Prevent & Control Gas & Roof D, Xiangtan, Hunan, Peoples R China

[3] Natl Key Lab Gas Disaster Detecting Preventing & E, Chongqing, Peoples R China

[4] China Coal Technol Engn Grp Chongqing Res Inst, Chongqing, Peoples R China

[5] Shandong Univ Sci & Technol, State Key Lab Strata Intelligent Control & Green M, Qingdao, Peoples R China

[6] Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao, Peoples R China

[7] China Coal Technol Engn Grp Shenyang Res Inst, Shenyang, Liaoning, Peoples R China

[8] Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian, Shanxi, Peoples R China

[9] Hunan City Univ, Coll Civil Engn, Yiyang, Hunan, Peoples R China

[10] Shandong Univ Sci & Technol, State Key Lab Strata Intelligent Control & Green M, 579, Qianwangang Rd, Qingdao 266590, Shandong, Peoples R China

[11] Shandong Univ Sci & Technol, Minist Sci & Technol, 579, Qianwangang Rd, Qingdao 266590, Shandong, Peoples R China

来源：

ENERGY SCIENCE & ENGINEERING | 2023年 / 11卷 / 09期

基金：

中国国家自然科学基金;

关键词：

degree of metamorphism; gas desorption; pore volume; primary coal; specific surface area; ADSORPTION;

D O I：

10.1002/ese3.1513

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：

Pore 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 cm(3)/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.

引用

页码：3185 / 3203

页数：19

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