文献类型：期刊文献

英文题名：CFD prediction of scale-up effect on the hydrodynamic behaviors of a pilot-plant fluidized bed reactor and preliminary exploration of its application for non-pelletizing polyethylene process

作者：Che, Yu[1];Tian, Zhou[2];Liu, Zhen[1];Zhang, Rui[3];Gao, Yuxin[3];Zou, Enguang[3];Wang, Sihan[3];Liu, Boping[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Key Lab Adv Control & Optimizat Chem Processes, Minist Educ, Shanghai 200237, Peoples R China;[3]Petrochem Res Inst PetroChina, Daqing Petrochem Res Ctr, Daqing City 163714, Heilongjiang Pr, Peoples R China

年份：2015

卷号：278

起止页码：94

外文期刊名：POWDER TECHNOLOGY

收录：;EI(收录号：20151300692714);WOS:【SCI-EXPANDED(收录号:WOS:000355023300011)】；

基金：This work is financially supported by the National High Technology Research and Development Program 863 (No. 2012AA040306), the National Natural Science Foundation of China (21406061), and the Shanghai Municipal Natural Science Foundation (14ZR1410600). The authors also express thanks to Prof. Huanxin Lai for his valuable suggestions and help.

语种：英文

外文关键词：Computational fluid dynamic (CFD); Non-pelletizing polyethylene process (NPPP); Pilot-plant fluidized bed reactor; Core-annulus structure; Scale-up effect

摘要：This work aims to explore the scale-up effect on the hydrodynamic natures in a pilot-plant gas phase ethylene polymerization fluidized bed reactor (FBR) based on two-dimensional (2D) transient Eulerian model integrating the kinetic theory of granular flow (KTGF). Unlike lab scale FOR, significant differences in the core-annulus structures caused by the scale-up effect are revealed. The core region in pilot-plant scale FBR is much broader, and the distribution is nearly flat for two phases. The annulus structure is thin, and exhibits a very small particle velocity fluctuation. The bed expanding section could reduce the solid velocity and improve the flow patterns of gas and polymer particles. Simulations are also performed to assess the effects of polymer particle size and gas velocity on the hydrodynamics for the non-pelletizing polyethylene process. With the increase of polymer particle diameter (446 mu m to 1338 mu m), the superficial gas velocity should be increased from 0.60 m/s to 0.90 m/s to achieve better steady fluidized state. The results are helpful for understanding how the local mean two phases' velocities and volume fractions vary in pilot-plant reactor for PE production caused by scale-up effect. (C) 2015 Elsevier B.V. All rights reserved.