文献类型：期刊文献

英文题名：Coupled CFD-PBM simulation of bubble size distribution in a 2D gas-solid bubbling fluidized bed with a bubble coalescence and breakup model

作者：Wang, Teng[1];Xia, Zihong[1];Chen, Caixia[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：202

起止页码：208

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20191306676646);WOS:【SCI-EXPANDED(收录号:WOS:000463879900019)】；

基金：This work is supported by National Natural Science Foundation of China (NSFC) under Grant No. 21276085, and Yankuang Energy R&D Co., Ltd, Shanghai.

语种：英文

外文关键词：Gas-solid bubbling fluidized bed; Bubble size distribution; CFD-PBM; Bubble coalescence and breakup model; Pseudo bubble-emulsion drag model

摘要：A coupled model of computational fluid dynamics and population balance model (CFD-PBM) scheme was developed to simulate bubble size distribution in gas-solid bubbling fluidized beds. The bubbling gas fluidized bed was divided into a discrete bubble phase and a dense emulsion including a pseudo solids continua modeled by the kinetic theory of granular flow (KTGF). A modified bubble coalescence and breakup model was proposed and implemented in the population balance model. A pseudo bubble-emulsion drag force model was derived based on the bubble size distribution and used for simulating the gas-solid momentum exchanges between gas bubbles and the solids belong to the emulsion phase. By taking into account the effects of bubble coalescence and breakup, the coupled CFD-PBM model was capable of predicting the hydrodynamic behavior of a bubbling gas-solid fluidized bed. A benchmark simulation showed good agreements between the computation results and the literature experimental data. Particularly, the predicted time-averaged bubble local hold-up maps, bubble size distributions and their evolution agreed well with the measurement data. Grid convergence simulation results demonstrated that the present model is able to predict the major hydrodynamic behavior of a 2D bubbling fluidized bed using coarse computational grids, which makes the present model a promising tool for applications in large-scale fluidized bed reactors. (C) 2019 Elsevier Ltd. All rights reserved.