Experimental Research on Pore Structure and Gas Adsorption Characteristic of Deformed Coal  

作　　者：Guo Deyong Guo Li Miao Xinhui 

机构地区：[1]School of Resource and Safety Engineering, China University of Mining and Technology (Beijing)

出　　处：《China Petroleum Processing & Petrochemical Technology》2014年第4期55-64,共10页中国炼油与石油化工（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.41172144);supported by the Key(Key Grant)Project of Chinese Ministry of Education(No.311022)

摘　　要：The pore structure and gas adsorption property of deformed coal with different degrees of metamorphism were tested by low-temperature nitrogen adsorption and isothermal adsorption experiments. The fractal theory and the Langmuir adsorption theory were used to analyze the experimental data. The test results showed that the deformed coal had more heterogeneous pore structures and open pores, and its specific surface area(SSA) and fractal dimension(D) were higher. There is a polynomial relationship between D and specific surface area as well as gas adsorption capacity(VL). The gas adsorption capacity of deformed coal is influenced by pore structure, coal rank, deformation and stress together, among which the pore structure is the main influencing factor for the adsorption capacity of deformed coal. The test pressure could affect the accuracy of the adsorption constants a and b, so the highest experiment pressure should be greater than the actual pressure of coal seam in order to reduce the deviation of adsorption constants.The pore structure and gas adsorption property of deformed coal with different degrees of metamorphism weretested by low-temperature nitrogen adsorption and isothermal adsorption experiments. The fractal theory and the Langmuiradsorption theory were used to analyze the experimental data. The test results showed that the deformed coal had more heterogeneouspore structures and open pores, and its specific surface area （SSA） and fractal dimension （D） were higher. Thereis a polynomial relationship between D and specific surface area as well as gas adsorption capacity （VL）. The gas adsorptioncapacity of deformed coal is influenced by pore structure, coal rank, deformation and stress together, among which the porestructure is the main influencing factor for the adsorption capacity of deformed coal. The test pressure could affect the accuracyof the adsorption constants a and b, so the highest experiment pressure should be greater than the actual pressure ofcoal seam in order to reduce the deviation of adsorption constants.

关 键 词：DEFORMED COAL PORE structure NITROGEN ADSORPTION ISOTHERMAL ADSORPTION 

分 类 号：TQ536[化学工程—煤化学工程] O647.3[理学—物理化学]