3D numerical simulation of flow characteristics for Geldart B and Geldart D particles in gas phase ethylene polymerization fluidized-bed reactor

CHE Yu; TIAN Zhou; ZHANG Rui; GAO Yuxin; ZOU Enguang; WANG Sihan; LIU Boping

doi:10.11949/j.issn.0438-1157.20151205

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3D numerical simulation of flow characteristics for Geldart B and Geldart D particles in gas phase ethylene polymerization fluidized-bed reactor

更新时间：2025-12-10

- 3D numerical simulation of flow characteristics for Geldart B and Geldart D particles in gas phase ethylene polymerization fluidized-bed reactor
- CIESC Journal Issue 2, Pages: 519-529(2016)
- 作者机构：
  
  1. 华东理工大学化学工程联合国家重点实验室,上海,200237
  2. 华东理工大学化工过程先进控制与优化技术教育部重点实验室,上海,200237
  3. 中国石油石油化工研究院大庆化工研究中心,黑龙江,大庆,163714
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151205
  CLC： Q316.3
- Online First：05 February 2016，
  
  Published：05 February 2016
- 稿件说明：
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CHE Yu, TIAN Zhou, ZHANG Rui, et al. 3D numerical simulation of flow characteristics for Geldart B and Geldart D particles in gas phase ethylene polymerization fluidized-bed reactor[J]. CIESC Journal, 2016, (2): 519-529.
DOI：

CHE Yu, TIAN Zhou, ZHANG Rui, et al. 3D numerical simulation of flow characteristics for Geldart B and Geldart D particles in gas phase ethylene polymerization fluidized-bed reactor[J]. CIESC Journal, 2016, (2): 519-529. DOI： 10.11949/j.issn.0438-1157.20151205.

摘要

乙烯气相聚合流化床反应器的设计、操作和优化依赖于对聚合物颗粒粒径大小和分布、气泡运动特性及聚合反应状况的准确描述。采用Eulerian-Eulerian 双流体模型和群体平衡模型耦合方法对某乙烯气相聚合中试规模的工业流化床反应器分别处于常规聚合工艺(属Geldart B 类颗粒)和免造粒工艺(属Geldart D 类颗粒)时床体的气固流动特征以及不同颗粒类型对反应器操作状态和颗粒运动特性的影响进行了三维数值模拟研究。与传统聚乙烯生产工艺相比

免造粒工艺时的Geldart D 类聚合物颗粒更易聚集于气体入口处区域

而且会产生明显的旋涡并出现较大的气泡。研究结果可为免造粒聚乙烯生产工艺的工业推广应用提供参考。

Abstract

The status of polyethylene (PE) particle size and distribution

bubble generation and movement

and polymerization reaction in gas phase ethylene polymerization fluidized-bed reactor (FBR) is significant for PE production process

reactor design

optimization and control. Based on 3 dimensional (3D) Eulerian-Eulerian two-fluid model combined with a population balance model (PBM)

this work aims to explore the two-phase flow characteristics and the effects of traditional PE production process (Geldart B particles) and non-pelletizing PE production process (Geldart D particles) on the operating behaviors in a pilot-plant FBR. The simulation results match well with the industrial measured pressure drop and temperature data. It is also found that the polymer particles observably concentrated on the bed inlet region for the effects of Geldart D particles and superfical gas velocity. In addition

the obvious vortexes and large bubbles can be clearly observed in the bed height direction. The results could provide foundation for the extension and application of the non-pelletizing PE production process.

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