煤质技术2025，Vol.40Issue(4)：1-10,10.DOI:10.3969/j.issn.1007-7677.2025.04.001
炼焦煤热解胶质体原态特性及其演化规律
In-situ characteristics and evolutionary law of plastic layer during pyrolysis of coking coal
摘要
Abstract
To investigate the characteristics thoroughly of the plastic mass developed during coking process of coking coal,and the changes of the microstructure of coal coke during the pyrolysis process,in-situ pyrolysis experiments were carried out on Gu jiao coking coal(JM),Lin fen rich coal(FM)and Huai Nan 1/3 coking coal(1/3JM)samples by in-situ pyrolysis equipment,and the colloid in situ semi-coke was prepared.Combined with the thermos gravimetric(TG)and Gieseler fluidity characteristics of coal samples,Raman spectroscopy(Raman),X-ray dif-fraction(XRD),scanning electron microscopy(SEM)and coke micro-strength index(MSI)were used to charac-terize in-situ semi-coke at different temperatures,and the softening-melt-curing process of the colloids was analyzed.The results showed that the maximum thermogravimetric rates(Kmax)of JM,FM and 1/3JM coal samples were 0.3%/min,0.58%/min and 0.84%/min,respectively.And the corresponding temperature points(Tmax)were 482.2,462.3 and 431.2℃,which overlapped with the melting stage of the plastic layer.As the pyrolysis tempera-ture T increased from the initial softening temperature(Ts)to the curing temperature(Tr),the semi-coke half-peak width(FWHM)increased,the relative absorption strength(AG/Aall)increased,AD3/AG decreased,AD1/AG decreased,and AD4/AG decreased first and then increased.These showed that the order degree of semi-coke was in-creased,the defects were reduced,and the microcrystalline structure units were gradually improved.Among the T from Tsto Tr,the AG/Aall values of JM,FM and 1/3JM increased from 16.38%to 17.21%,15.29%to 17.76%and 14.75%to 17.01%,respectively.Also,for FWHM values,JM＜FM＜1/3JM.As T increased from Tsto Tr,the crystallite structure parameters such as aromaticity(fa),carbon crystallite stacking thickness(Lc)and carbon plane size(La)increased of semi-coke.From Tsto Tr,the La of JM,FM and 1/3JM increased from 2.87 to 3.47 nm,2.34 to 3.38 nm and 2.40 to 3.36 nm,respectively.In addition,Lc increased from 2.13 to 2.27 nm,2.04 to 2.24 nm and 2.02 to 2.18 nm,respectively.With T increased from Tsto Tr,the diameter of aperture and pore size of the semi-coke surface increased gradually.1/3JM coal samples were pyrolyzed at different pyrolysis tempera-tures from 401℃to 950℃.When T was less than Tr,the MSI value of coke samples was close to zero.When T in-creased from 474℃(Tr)to 950℃,MSI value of coke sample increased from 10.20%to 56.95%.关键词
胶质体/原态特性/炼焦煤/微晶结构/相对吸收强度/吉氏流动度/芳香度/堆叠厚度Key words
plastic layer/in-situ characteristics/coking coal/crystallite structure/relative absorption strength/Gieseler fluidity/aromaticity/stacking thickness分类
化学化工引用本文复制引用
白效言..炼焦煤热解胶质体原态特性及其演化规律[J].煤质技术,2025,40(4):1-10,10.基金项目
天地科技股份有限公司科技创新创业资金专项资助项目(2021-TD-QN001) （2021-TD-QN001）
