文献类型：期刊文献

中文题名：工业聚乙烯流化床的气固流动特性数值模拟

英文题名：Numerical Simulation of Gas-Solid Flow Characteristics in Industrial Polyethylene Fluidized Bed

作者：刘信瑀[1];张海涛[1];马宏方[1];李涛[1]

机构：[1]华东理工大学大型工业反应器工程教育部工程研究中心,上海200237

年份：2022

卷号：48

期号：6

起止页码：736

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

语种：中文

中文关键词：两相流;流化床;数值模拟;CPFD;图像处理

外文关键词：two-phase flow;fluidized-bed;numerical simulation;CPFD;image processing

摘要：采用计算颗粒流体力学(CPFD)的数值模拟方法,对工业级聚乙烯流化床内的气固流动特性进行了冷态模拟,并利用Matlab的图像处理功能将图像的像素点与模拟网格进行对应来计算流化床内的气泡大小。从流化床流动结构、颗粒、气泡3个角度,研究了不同气速、不同初始物料量对工业级聚乙烯流化床的气固流动特性的影响。结果表明:从颗粒的轴径向分布情况可以看出,工业流化床内部的边壁效应明显较弱,密相区整体呈现较为均匀的颗粒分布;气速对于流化床气固流动的影响较大,当气速为0.46 m/s时,流化床内密相区的颗粒分布最为均匀,整体的流动较好;初始床层高度主要影响流化后密相区的高度,对于床层膨胀率的影响较小。
Based on computational particle fluid dynamics(CPFD), an industrial grade polyethylene fluidized bed model in cold state was established to simulate the gas-solid flow characteristics in fluidized bed, and the image processing function of MATLAB was used to calculate the bubble size in the fluidized bed by matching the image pixels with the simulated grid. The effects of gas velocity and initial material quantity on the gas-solid flow characteristics of industrial grade polyethylene fluidized bed were studied from the perspectives of fluidized bed flow structure, particles and bubble. The results show that compared with the equipment in pilot and experimental stages, the side-wall effect in the industrial fluidized bed is obviously weak, and the dense-phase zone presents a more uniform particle distribution. The gas velocity has a great influence on the gas-solid flow in the fluidized bed. Under the operating condition of 0.46 m/s gas velocity, the particle distribution in the dense-phase zone is the most uniform, and the bulk flow becomes steady. The initial bed height mainly affects the height of the dense phase zone after fluidization,but has little effect on the bed expansion rate.