原生微生物降解煤对煤体孔隙结构影响的研究  

Study on the Effect of Primary Microbial Degradation of Coal on the Pore Structure of Coal

作　　者：张远远 薛生 李峰[1,2] ZHANG Yuanyuan;XUE Sheng;LI Feng(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan Anhui 232001,China;Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001 [2]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [3]安徽理工大学煤炭安全精准开采国家地方联合工程研究中心,安徽淮南232001

出　　处：《安全》2023年第9期23-30,共8页Safety & Security

基　　金：安徽省重点研究与开发计划项目(2022I07020020)。

摘　　要：为探究原生微生物降解煤对煤体孔隙结构及分形特征的影响,选用焦家寨煤矿新鲜煤样,采用半胱氨酸和生理盐水浸提其中原生微生物并进行厌氧培养;通过液氮吸附实验和压汞实验对煤体的孔隙结构进行测定,结合分形理论定量分析煤体孔隙特征。结果表明:微生物处理后,微孔孔容增加35.08%,比表面积增加48.06%;小孔孔容增加131.15%,比表面积增加98.60%;中孔孔容减少10.45%,比表面积减少2.81%;大孔孔容增加15.45%,比表面积增加9.60%;处理组微小孔分形维数为2.50263,比对照组降低1.5%;中孔分形维数为2.03579,比对照组增加8.05%。微生物厌氧降解处理对煤体孔隙发育效果显著;微小孔分形维数降低,煤体表面变得光滑、均匀质增强;中孔分形维数具有明显的分形特征。In order to explore the effect of primary microbial degradation of coal on pore structure and fractal characteristics of coal,fresh coal samples from Jiaojiazhai Coal mine were selected,and the primary microorganisms were extracted with cysteine and normal saline,and then anaerobic culture was carried out to study the effect of primary microbial activities on pore structure of coal.The pore structure of coal was measured by liquid nitrogen adsorption experiment and mercury injection experiment,and the pore characteristics of coal were quantitatively analyzed by combining fractal theory.The results showed that the pore volume and specific surface area of micropores increased by 35.08% and 48.06% after microbial treatment.The pore volume and specific surface area of the pore increased by 131.15% and 98.60% respectively.The pore volume and specific surface area of mesopore decreased by 10.45% and 2.81% respectively.Large pore volume increased by 15.45%;The specific surface area of macropore increased by 9.60%.According to the fractal theory,the fractal dimension of micropores in the treatment group was 2.50263,which was 0.03926 lower than that in the control group.The fractal dimension of the hole in the treatment group was 2.03579,which was 8.05% higher than that in the control group.Microbial anaerobic degradation of coal promotes the development of micropores,small pores and large pores,and anaerobic degradation treatment has a significant effect on the development of coal pores and promotes the development of pores.The fractal dimension of micropores decreases,the surface of coal becomes smooth and the uniform quality increases.The fractal dimension of mesopore has obvious fractal characteristics.

关 键 词：微生物 煤孔隙 液氮 压汞 分形维数 

分 类 号：X936[环境科学与工程—安全科学] TD7[矿业工程—矿井通风与安全]