气固流化床启动阶段挡板内构件受力特性的CFD-DEM模拟  

CFD-DEM simulation of the force acting on immersed baffles during the start-up stage of a gas-solid fluidized bed

作　　者：李铁男 赵碧丹 赵鹏 张永民[1] 王军武[2,3,4] LI Tienan;ZHAO Bidan;ZHAO Peng;ZHANG Yongmin;WANG Junwu(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Green Manufacture,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]中国科学院大学化学工程学院,北京100049 [4]中国科学院绿色过程制造创新研究院,北京100190

出　　处：《化工学报》2022年第6期2649-2661,共13页CIESC Journal

基　　金：国家自然科学基金项目(21978295,21276273,91834303);中国科学院绿色过程制造创新研究院自主部署项目(IAGM-2019-A13)。

摘　　要：流化床启动阶段内构件会受到较大的破坏性载荷冲击,为了保障流化床内构件的长周期可靠性,需要掌握这个阶段内构件在流化床内的受力特性。首先提出了一种统计内构件表面受力的方法,将微观颗粒-挡板作用信息转换为宏观挡板受力载荷信息。在此基础上采用CFD-DEM方法,统计分析了流化床启动阶段床层中水平挡板内构件的受力载荷特性。研究结果表明:CFD-DEM方法可半定量复现实验中启动阶段内构件表面受到的动态载荷信号,并复现了表观气速和颗粒粒径对挡板峰值载荷强度的影响规律。本研究证明了内构件表面受力载荷强度统计方法的正确性和CFD-DEM统计分析受力载荷的可行性。In the start-up stage of a fluidized bed,the internal components will be impacted by a large destructive load.In order to ensure the long-term reliability of the internal components of the fluidized bed,it is necessary to master the force characteristics of the internal components in the fluidized bed at this stage.To this end,a method for statistically calculating the stress exerted on the internals from CFD-DEM simulation was proposed,and the simulation results were validated.It was found that the experimentally measured dynamic load impact can be reproduced semi-quantitatively,the effects of superficial gas velocity and particle properties on the load impact can also be predicted.Present study proved not only the correctness of the proposed statistical method,but also the feasibility of extracting the stress exerted on the internals using CFD-DEM method.

关 键 词：内构件 介尺度结构 流化床 CFD-DEM方法 多相流 数值模拟 

分 类 号：TQ021.1[化学工程]