文献类型：期刊文献

英文题名：Investigation into the caking mechanism of hydro-modified coal based on subfraction separation

作者：Cao, Song[1,2];Huang, Sheng[1,2];Zhou, Jie[1,2];Wu, Youqing[1,2];Wu, Shiyong[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Coal Liquificat Gasificat & Utilizat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon Containing W, Minist Educ, Shanghai 200237, Peoples R China

年份：2026

卷号：408

外文期刊名：FUEL

收录：;EI(收录号：20254819622476);WOS:【SCI-EXPANDED(收录号:WOS:001630675200007)】；

基金：We gratefully acknowledge the financial support of this work by the National Natural Science Foundation of China (22378129 and 22578128) and the National Key R & D Program of China (2022YFB4101300) .

语种：英文

外文关键词：Caking coal; Hydro-modification; Solvent fractionation; Asphaltene subfractions; Caking mechanism

摘要：The caking mechanism of hydro-modified coal was investigated through a novel approach combining sequential solvent fractionation and extraction of subfractions. The modified coal was separated into five components, identifying asphaltene (AS), preasphaltene (PA), and THF insoluble pyridine-soluble fractions (PS) as the caking components. PA demonstrated superior caking properties compared to AS and PS, primarily attributed to a synergistic interaction between its CS2-soluble (CSF) and NMP-soluble (WNF) subfractions. This synergy arises from their complementary structural characteristics: CSF provides fluidity and partial expansibility through its aliphatic-rich structures, while WNF contributes essential viscosity and supplementary expansibility through its condensed aromatic clusters. The synergy of CSF and WNF facilitates the formation of a continuous plastic phase during the thermoplastic stage. This plastic phase effectively encapsulates inert particles, leading to superior caking properties. These findings elucidate the relationship between subfraction structure and caking behavior, establishing a fundamental theoretical basis for converting low-rank coals into high-quality caking coals through hydro-modification.