Simulations of biomass pyrolysis using glued-sphere CFD-DEM with 3-D intra-particle models

热解 粒子(生态学) 传热 流化床 CFD-DEM公司 材料科学 粒径 生物量(生态学) 比奥数 机械 离散元法 传质 球体 化学工程 热力学 物理 地质学 工程类 航空航天工程 海洋学
作者
Liqiang Lu,Xi Gao,Mehrdad Shahnam,William A. Rogers
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:419: 129564-129564 被引量:56
标识
DOI:10.1016/j.cej.2021.129564
摘要

The shape of biomass particles influences intra-particle heat transfer, particle-particle collisions, interphase momentum, heat transfer, and pyrolysis yield. In this research, the effects of these multi-scale phenomena are captured using a glued-sphere computational fluid dynamic discrete element method (CFD-DEM) with 3-D intra-particle models. The glued-spheres resolved the shapes of particles and intra-particle temperature and species distributions. The implementation was validated using the pyrolysis data of a spherical particle and a cylindrical particle. Then, the influences of biomass shapes and sizes on pyrolysis were investigated. The results revealed the significant influence of surface areas and mass distributions on interphase heat transfer and chemical reactions. The intra-particle heat transfer is neglectable for a Biot number smaller than 0.41. Finally, the pyrolysis of irregularly shaped biomass particles in a fixed bed, fluidized bed, and spouted bed was simulated. Analysis of conversion distributions showed the largest deviations in the fixed bed and the slowest conversion rate in the spouted bed. A good balance between uniform and fast conversion is achieved in the fluidized bed. The multi-scale method proposed in this research provides a tool for the evaluation of large irregular-shaped biomass particle pyrolysis in different types of reactors.
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