文献类型：期刊文献

英文题名：Coking behavior and mechanism of direct coal liquefaction residue in coking of coal blending

作者：Chen, Zhihui[1];Wu, Youqing[1,2];Huang, Sheng[1,2];Wu, Shiyong[1,2];Gao, Jinsheng[1,2]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：280

外文期刊名：FUEL

收录：;EI(收录号：20202908950558);WOS:【SCI-EXPANDED(收录号:WOS:000563985100011)】；

基金：This research was supported by the National Key Research and Development Program of China (2018YFB0604602) and the National Natural Science Foundation of China (Grant Nos. 21878096).

语种：英文

外文关键词：Direct coal liquefaction residue; Coal blending for coking; Cold mechanical strength; Thermal strength

摘要：Direct coal liquefaction residue (DCLR) was directly blended with five coke-making coals for the first time in this study. The effect of DCLR addition on coke quality was investigated. The coking mechanism of DCLR as a binder in blending coals was also elucidated. Results showed that 5% and 10% DCLR addition to blending coal could reduce 8% and 13% high caking property coals respectively without causing any great impairment in cold mechanical strength. Compared with JM (coking coal) and FM (fat coal) asphaltenes, DCLR asphaltene exhibited obvious differences as it contained higher percentages of aromatic C=C and aliphatic -CH2- functional groups which could indirectly enhance the caking property of blending coal and improve the cold mechanical strength of coke resulting in cold mechanical strength M-13 increasing from 90.31% to 96.77%. The roles of DCLR participating in coking can be summarized in two stages. Firstly, DCLR can fully moisten the surface of coal particles in the early stage of coal pyrolysis (350-380 degrees C) and suppress the gas escaping from coal particles, resulting in a higher internal pressure. Secondly, internal gas breaks through the metaplast layer and squeezes the sticky metaplast produced by DCLR into holes between coal particles in the key stage of coal pyrolysis (380-450 degrees C), leading to high quality coke.