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

doi:10.11949/j.issn.0438-1157.20151205

CIESC Journal ›› 2016, Vol. 67 ›› Issue (2): 519-529.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

CHE Yu¹, TIAN Zhou², ZHANG Rui³, GAO Yuxin³, ZOU Enguang³, WANG Sihan³, LIU Boping¹

1 State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;
3 Daqing Petrochemical Research Center, Petrochemical Research Institute of PetroChina, Daqing 163714, Heilongjiang, China

Received:2015-07-27 Revised:2015-09-18 Online:2016-02-05 Published:2016-02-05
Supported by:
supported by the National Basic Research Program of China (2012CB720502), the National Natural Science Foundation of China (21406061), the Shanghai Municipal Natural Science Foundation (14ZR1410600), the Program of Introducing Talents of Discipline to Universities (B08021) and the Fundamental Research Funds for the Central Universities.

乙烯气相聚合流化床反应器内Geldart B类和Geldart D类颗粒流动特性的三维数值模拟

车煜¹, 田洲², 张瑞³, 高宇新³, 邹恩广³, 王斯晗³, 刘柏平¹

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

通讯作者: 田洲, 刘柏平
基金资助:
国家重点基础研究发展计划项目(2012CB720502);国家自然科学基金项目(21406061);上海市自然科学基金项目(14ZR1410600);引智计划项目(B08021);中央高校基本科研业务费专项资金项目。

Abstract

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.

Key words: fluidized-bed, polyethylene, CFD, Geldart D particles, non-pelletizing PE production process, particle size distribution

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。

关键词: 流化床, 聚乙烯, 计算流体力学, Geldart D 类颗粒, 免造粒工艺, 粒度分布

CLC Number:

TQ316.3

CHE Yu, TIAN Zhou, ZHANG Rui, GAO Yuxin, ZOU Enguang, WANG Sihan, LIU Boping. 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, 67(2): 519-529.

车煜, 田洲, 张瑞, 高宇新, 邹恩广, 王斯晗, 刘柏平. 乙烯气相聚合流化床反应器内Geldart B类和Geldart D类颗粒流动特性的三维数值模拟[J]. 化工学报, 2016, 67(2): 519-529.

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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

乙烯气相聚合流化床反应器内Geldart B类和Geldart D类颗粒流动特性的三维数值模拟

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