Influence of pore structure on thermal stress distribution inside coal particles during primary fragmentation
作者机构：School of Chemical EngineeringSichuan UniversityChengdu610065China Institute of New Energy and Low-carbon TechnologyChengdu610207China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2024年第85卷第2期
页 面：49-61页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by National Natural Science Foundation of China(grant No.21908150) China Postdoctoral Science Foundation(grant No.2019M653404) the Key Research&Development Program of Sichuan Province,China(grant No.22zDYF 1839) Sichuan University Post-Doctoral Interdisciplinary Innovation Initial Funding.
主 题：Coal particle Primary fragmentation Thermal stress Pore structure Porosity
摘 要：Thermal stress is an important reason of coal particle primary fragmentation,during which the role of pore structure is ambiguous.Thermal stress induced fragmentation experiments were conducted with low volatile coal/char particles,and the results show that the fragmentation severity enhances with increasing porosity.Various porous thermal stress models were developed with finite element method,and the influences of the pore shape,size,position and porosity on the thermal stress were discussed.The maximum thermal stress inside particle increases with pore curvature,the pore position affects the thermal stress more significantly at the particle center and surface.The expectation of the maximum tensile thermal stress linearly increases with porosity,making the particles with higher porosity easier to fragment,contrary to the conclusion deduced from the devolatilization theory.The obtained results are valuable for the analysis of different thermal processes concerning the thermal stresses of the solid feedstocks.
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