Effect of demineralization on pyrolysis characteristics of LPS coal based on its chemical structure  

作　　者：Lin Qian Jinkai Xue Chao Tao Chao Ma Xiaopeng Jiang Feiqiang Guo 

机构地区：[1]School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China [2]State Key Laboratory of Clean Energy Utilization,Zhejiang University,310027 Hangzhou,China

出　　处：《International Journal of Coal Science & Technology》2023年第2期181-195,共15页国际煤炭科学技术学报（英文）

基　　金：supported by the National Natural Science Foundation of China (51536002);the Fundamental Research Funds for the Central Universities (2015QNA12);the Open Sharing Fund for the Large-scale Instruments and Equipments of China University of Mining and Technology (CUMT).

摘　　要：The critical issue in developing mature Oxy-Coal Combustion Steam System technology could be the reactivity of deminer-alized coal which,is closely related to its chemical structure.The chemical structures of Liupanshui raw coal(LPS-R)and Liupanshui demineralized coal(LPS-D)were analyzed by FTIR and solid-state 13C-NMR.The pyrolysis experiments were carried out by TG,and the pyrolysis kinetics was analyzed by three iso-conversional methods.FTIR and 13C-NMR results suggested that the carbon structure of LPS coal was not altered greatly,while demineralization promoted the maturity of coal and the condensation degree of the aromatic ring,making the chemical structure of coal more stable.The oxygen-containing functional groups with low bond energy were reduced,and the ratio of aromatic carbon with high bond energy was increased,decreasing the pyrolysis reactivity.DTG curve-fitting results revealed that the thermal weight loss of LPS coal mainly came from the cleavage of aliphatic covalent bonds.By pyrolysis kinetics analysis of LPS-R and LPS-D,the apparent activation energies were 76±4 to 463±5 kJ/mol and 84±2 to 758±12 kJ/mol,respectively,under different conversion rates.The reactivity of the demineralized coal was inhibited to some extent,as the apparent activation energy of pyrolysis for LPS-D increased by acid treatment.

关 键 词：DEMINERALIZATION Chemical structure of coal Coal pyrolysis Pyrolysis kinetics Iso-conversional 

分 类 号：TD82[矿业工程—煤矿开采]