• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
基于氮气吸附-扫描电镜的构造煤孔隙特征研究
  • Title

    Pore characteristics of tectonic coal based on nitrogen adsorption and SEM

  • 作者

    霍中刚席志哲郭建行汪东

  • Author

    HUO Zhonggang;XI Zhizhe;GUO Jianhang;WANG Dong

  • 单位

    煤炭科学研究总院煤炭科学技术研究院有限公司煤矿灾害防控全国重点实验室

  • Organization
    Chinese Institute of Coal Science China Coal Research Institute
    China Coal Research Institute Mine Safety Technology Branch, China Coal Research Institute
    State Key Laboratory of Coal Mine Disaster Prevention and Control
  • 摘要
    煤的孔隙结构特征与瓦斯的吸附和运移密切相关,构造煤的孔隙结构特征由于受到构造应力的破坏而趋于复杂,因此开展构造煤孔隙发育的研究是提升瓦斯治理水平的重要方向。以西山煤田南部东于煤矿三组构造煤和一组原生煤为研究对象,采取低温液氮吸附法和扫描电子显微镜(SEM),联合观测构造煤与原生煤的孔隙特征。研究表明:三组构造煤的氮气吸附量为原生煤的2.04倍、1.49倍和2.90倍,三组构造煤的孔容为原生煤的2.08倍、1.53倍和2.96倍;三组构造煤的孔容大部分由微孔和小孔提供均达到69.71%以上,孔比表面积大部分由微孔提供均达到了79.04%以上;原生煤的孔容大部分由微孔和小孔提供达到了89.38%,孔比表面积微孔占比93.97%;三组构造煤的孔隙结构相比原生煤更加复杂,具有更大的分形维数(2.6985~2.7106);三组构造煤(10000倍)表面分形维数分别为1.962、1.979、1.947均大于原生煤1.945,构造煤与原生煤相比有更为发育的孔隙特征;分形维数D1与总孔比表面积、微孔比表面积成正比;挥发分含量在一定范围内与总孔比表面积、微孔比表面积、小孔比表面积成正比。
  • Abstract
    The pore structure characteristics of coal are closely related to gas absorption and transport. Due to damage caused by structural stress, the pore structure characteristics of tectonic coal tend to be complicated. Thus, investigating the development of tectonic coal pores is an important direction for improving the gas treatment level. In this paper, three groups of tectonic coal and a group of intact coal from the Dongyu Coal Mine in the southern part of the Xishan Coalfield were taken as the research object.Besides, the pore characteristics of tectonic coal and intact coal were jointly observed using low-temperature liquid nitrogen adsorption and scanning electron microscopy (SEM). As shown by the research, the nitrogen adsorption amount of the three groups of tectonic coal is 2. 04 times, 1. 49 times, and 2. 90 times that of intact coal. The pore volume of the three groups of tectonic coal is 2. 08 times, 1. 53 times and 2. 96 times that of intact coal, respectively. The pore volume of the three groups of tectonic coal in micropores and small pores is more than 69. 71%. The proportion of micropores in the pore specific surface area of the three groups of structural coal exceeds 79. 04%. The micropores and small pores of intact coal provide 89. 38% of the pore volume, and the pore specific surface area of micropores accounts for 93. 97%. The pore structure of the three groups of tectonic coal is more complex than that of the intact coal and had larger fractal dimension (2. 6985 to 2. 7106). The fractal dimensions of three groups’ tectonic coal (10, 000 times) are 1. 962, 1. 979, and 1. 947, respectively, greater than that of intact coal. In comparison to intact coal, tectonic coal had more developed pore system; the fractal dimension D1 is directly proportional to the total pore specific surface area and microporous surface area. The volatile content is directly proportional to the total pore surface area, microporous surface area, and small pore surface area within a certain range.
  • 关键词

    构造煤孔隙特征液氮吸附电镜扫描分形维数挥发分

  • KeyWords

    tectonic coal;pore characteristics;liquid nitrogen adsorption;electron microscopy scan;fractal dimension;volatile content

  • DOI
  • 引用格式
    霍中刚, 席志哲, 郭建行, 等. 基于氮气吸附-扫描电镜的构造煤孔隙特征研究 [J]. 煤炭工程, 2024, 56(3): 149-156.
相关问题

主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

©版权所有2015 煤炭科学研究总院有限公司 地址:北京市朝阳区和平里青年沟东路煤炭大厦 邮编:100013
京ICP备05086979号-16  技术支持:云智互联