低碳化学与化工2024，Vol.49Issue(10)：47-55,9.DOI:10.12434/j.issn.2097-2547.20230405
不同变质程度煤在胶质体阶段的碳结构演变探究
Study on carbon structure evolution of coal with different metamorphism degrees in colloidal stage
摘要
Abstract
The clean and efficient utilization of coal is of great significance for achieving the dual carbon goals.Five types of coking coal(Guanyintang coking coal,Matou coking coal,Wugou fat coal,Xiaoxian fat coal and Yanzhouxi gas coal)were pyrolyzed into coke using a self-made coke oven,and coal samples at different temperature ranges were extracted.The carbon structures of coal samples were investigated by combining characterization methods such as Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD).The FTIR results show that the aromatic structures of the five types of raw coal are mainly benzene ring disubstituted and tetrasubstituted,with relative contents exceeding 50％.As the temperature increases,the relative content change of benzene ring disubstituted in the five types of coal samples decreases to varying degrees,while the relative content of benzene ring tetrasubstituted and pentasubstituted shows a two-stage pattern.The fatty structures of five types of raw coal are mainly composed of methyl and methylene.As the temperature increases,the relative contents of methylene in Guanyintang coking coal,Matou coking coal,Wugou fat coal and Xiaoxian fat coal decrease by 18.85％,13.75％,16.50％and 12.65％,respectively.The relative content of methylene in Yanzhouxi gas coal reaches the lowest at 450 ℃,followed by a rapid decrease in methenyl content from 42.11％to 22.87％after 450 ℃.The FTIR structural parameters of the five coal samples were calculated,and it is found that the aromatic carbon and hydrogen rates of the coal samples significantly increase during the stage from 450 ℃ to 550 ℃,while alkyl chain length rapidly decreases.The XRD results show that as the temperature increases,the interplanar spacings of coking coal and fat coal decrease to 0.344 nm to 0.346 nm,while the interplanar spacing of gas coal only decreases by 0.007 nm.The lateral dimensions of the five coal samples show a trend of first decreasing and then increasing,while stacking heights show an increasing trend.The carbon structure parameters of coking coal and fat coal show significant changes,with the aromaticity of coking coal increasing to around 0.82,fat coal increasing to around 0.73,and gas coal having an aromaticity of only 0.57.关键词
煤热解/胶质层/傅立叶变换红外光谱/X射线衍射/碳结构Key words
coal pyrolysis/colloidal layer/fourier transform infrared spectroscopy/X-ray diffraction/carbon structure分类
化学化工引用本文复制引用
许恒光,田露,戚悦昕,徐秀丽,窦金孝,余江龙..不同变质程度煤在胶质体阶段的碳结构演变探究[J].低碳化学与化工,2024,49(10):47-55,9.基金项目
国家自然科学基金(22078141,22378180) （22078141,22378180）
辽宁省"揭榜挂帅"重点项目(2022JH1/10800065) （2022JH1/10800065）
辽宁省教育厅面上项目揭榜挂帅服务地方项目(JYTMS20230960). （JYTMS20230960）
