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基于CFD-DEM方法的加压鼓泡床气固流动特性数值模拟

Numerical simulation of gas-solid flow characteristics in pressurized bubbling fluidized bed based on CFD-DEM method
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摘要 为明确加压鼓泡流化床内气固两相流动基本规律以及压力的影响机制,为多种工业过程领域加压鼓泡流化床反应器的设计、运行和放大提供有益参考.文中基于CFD-DEM方法,以开源软件Mfix为计算框架,开展了加压鼓泡流化床气固两相流动数值模拟研究.首先依托薄矩形加压鼓泡流化床试验台数据进行模型验证,在此基础上,系统地研究了操作压力对Geldart B类颗粒临界流化速度的影响,获得了不同操作压力下床层内颗粒运动与分布规律以及气泡尺寸和频率分布.数值模拟结果表明:在0.1~0.7 MPa,随着操作压力的升高,Geldart B类颗粒临界流化速度减小,并且在低操作压力下临界流化速度随操作压力变化更加明显;同时,随着操作压力的升高,床层内气泡尺寸减小,床层均匀性有所改善. Numerical simulation study on a pressurized bubbling fluidized bed was carried out based on a coupled CFD-DEM approach using an open-source software(Mfix)in order to clarify the basic laws of gas-solid two-phase flow in a pressurized bubbling fluidized bed and the influencing mechanism of pressure,which provides useful reference for the design,operation and scale-up of pressurized bubbling fluidized bed reactors in various industrial processes.Firstly,the numerical model was verified by the experimental data from the thin rectangular pressurized bubbling fluidized bed.Based on this,the influence of operating pressure on the critical fluidization velocity of Geldart B-type particles,the particle movement and distribution laws,as well as the bubble size and frequency distribution at different operating pressures were systematically studied.The numerical simulation results show that the critical fluidization velocity of Geldart B-type particles decreases with the increase of operating pressure in the range of 0.1 MPa to 0.7 MPa,and the critical fluidization velocity changes more obviously with the increasing pressure under low operating pressure conditions.In addition,as pressure increases,the bubble size decreases,leading to improvement in bed uniformity.
作者 李玥嬛 朱晓丽 王振波 柳毅博 LI Yuehuan;ZHU Xiaoli;WANG Zhenbo;LIU Yibo(College of New Energy,China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处 《排灌机械工程学报》 CSCD 北大核心 2024年第6期570-575,共6页 Journal of Drainage and Irrigation Machinery Engineering
基金 国家自然科学基金资助项目(52106216)。
关键词 加压鼓泡床 气固流动特性 临界流化速度 气泡特性 pressurized bubbling fluidized bed gas-solid flow characteristics critical fluidization velocity bubble characteristics
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