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Influence of pore structure on thermal stress distribution inside coal particles during primary fragmentation

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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.

Coal particlePrimary fragmentationThermal stressPore structurePorosity

Kai Qiao、Shan Zhong、Siyang Tang、Ke Yang、Hairong Yue、Kui Ma、Lei Song、Bin Liang

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School of Chemical Engineering,Sichuan University,Chengdu,610065,China

Institute of New Energy and Low-carbon Technology,Chengdu,610207,China

National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationKey Research & Development Program of Sichuan Province,ChinaSichuan University Post-Doctoral Interdisciplinary Innovation Initial Funding

219081502019M65340422ZDYF 1839

2024

10.1016/j.partic.2023.03.021

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.85(2)
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