首页|Simulation of gas-solids heat transfer in cyclone pyrolyzer using CFD-DEM model

Simulation of gas-solids heat transfer in cyclone pyrolyzer using CFD-DEM model

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Fast heat transfer in the pyrolyzer can increase the yield of pyrolysis gas and tar,and improve the quality of tar.Compared with the downer pyrolyzer,the cyclone pyrolyzer can simultaneously achieve high solids holdup and violent turbulence,and correspondingly faster heat transfer.In this work,the heat transfer behavior in the cyclone pyrolyzer is specifically studied using the computational fluid dynamics-discrete element method.The simulation results reveal that the gas-solids heat convection contributes mainly to the heat transfer process,and the heat radiation and conduction are relatively small and almost negligible,respectively.Compared with the downer pyrolyzer under the same operating conditions,the heating rate is significantly increased in the cyclone pyrolyzer.By analyzing the flow characteristics in the cyclone pyrolyzer,it is found that the region of high convective heat transfer rate coincides with that of natural cyclone length.Additionally,the final coal temperature increases with the increase of gas velocity and exists a maximum value.These results can offer some qualitative understanding of the heat transfer behavior in the cyclone pyrolyzer.

Cyclone pyrolyzerRapidly heatingHeat convectionNatural cyclone lengthCFD-DEM

Nan Zhang、Xueer Pan、Jingxuan Yang、Qian Liu、Wenhao Lian、Xiao Du、Zhonglin Zhang、Xiaogang Hao、Guoqing Guan

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College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan,030024,China

School of Chemistry and Chemical Engineering,North University of China,Taiyuan,030051,China

Shanxi Jinke Technology Service Company Limited,Taiyuan,030000,China

Laboratory of Energy Conversion Engineering,Institute of Regional Innovation(IRI),Hirosaki University,3-Bunkyocho,Hirosaki,036-8561,Japan

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Fundamental Research Program of Shanxi ProvinceNational Natural Science Foundation of ChinaShanxi Province Science Foundation for YouthsShanxi Province Foundation for ReturnessFund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province

20220302121116422108262202103021246002022-13820220014

2024

10.1016/j.partic.2023.03.025

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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