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小型流化床干燥器气固流动和干燥的CPFD数值模拟

CPFD simulation of gas-solid flow and drying in a small-scale fluidized bed dryer
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摘要 为掌握炼焦煤工业流化床的颗粒干燥和分级过程,基于计算颗粒流体力学(CPFD)理论方法,以0.3mm为分级粒径对实验室规模的炼焦煤流化床干燥分级过程进行模拟研究.颗粒干燥模型由颗粒汽液平衡推导得出.曳力模型采用不考虑颗粒球形度的Wen-Yu/Ergun模型和考虑颗粒球形度的Ganser模型结合.研究结果发现:两种曳力模型结合得到的模型可更准确地预判流化床中不同粒径段颗粒的分布位置;此外,颗粒干燥模型结果与实验结果吻合,流化风风速越大或风温越高,颗粒干燥时间越短.同时在气固流动方面揭示了流化床干燥器中颗粒的流动特性:粗颗粒集中在流化床底部,而细颗粒分布在流化床上部;颗粒直径越大,颗粒速度越小.研究验证了CPFD手段预测流化床干燥器中气固流动和干燥过程的潜力和可行性,为后续的工业化放大和结构优化打下了基础. To improve classification and drying process in an industrial fluidized bed,particles with classification size of 0.3mm was taken to study the multiphase flow and drying process by experiment and simulation with 5kg/h lab scale fluidized bed dryer.The particle drying model was derived from the particle vapor-liquid equilibrium.The simulation applied a computational particle fluid dynamics(CPFD)modelling approach,which combined the Wen-Yu/Ergun drag model not considering the particle sphericity and the Ganser drag model considering the particle sphericity as its new drag model.The results show that the model combining two drag models is more appropriate to predict the distribution of particles with different particle sizes in the flu-idized bed.The results of particle drying model well match the findings of experiments.The particle drying time decreases with the increase of the velocity or temperature of the fluid gas.In terms of gas-solid flow,the results also demonstrate the flow characteristics of particles in the fluidized bed dryer in detail.Larger particles distribute at the bottom of the fluidized bed,while smaller particles distribute at the top.The particle velocity decreases with the increase of their own diameters.This research presents a potential feasibility of applying the CPFD simulation to predict the multiphase flow and drying process in the fluidized bed dryer,which lays a foundation for subsequent industrialization enlargement and structural optimization.
作者 陈祁 刘慧慧 汪大千 曾阔 鲍俊芳 陈鹏 杨海平 陈汉平 CHEN Qi;LIU Huihui;WANG Daqian;ZENG Kuo;BAO Junfang;CHEN Peng;YANG Haiping;CHEN Hanping(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China;Hubei Key Laboratory for Coking Coal Utilization,Wuhan Iron and Steel Group Corporation,Wuhan,Hubei 430080,China)
出处 《中国矿业大学学报》 EI CAS CSCD 北大核心 2019年第2期415-421,共7页 Journal of China University of Mining & Technology
基金 国家重点研发计划专项资助(2017YFB0304300 2017YFB0304303).
关键词 炼焦煤 分级 流化床 干燥 数值模拟 非球形颗粒 coking coal classification fluidized bed drying simulation non-spherical particles
作者简介 通信作者:杨海平(1977-),女,河南省许昌市人,教授,博士生导师,工学博士,从事生物质热解气化方面的研究.E-mail:yhping2002@163.com Tel:15926285917
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