Dynamic simulation of grade transition for ethylene slurry polymerization process based on simultaneous approach

doi:10.3969/j.issn.0438-1157.2012.09.005

CIESC Journal ›› 2012, Vol. 63 ›› Issue (9): 2703-2709.DOI: 10.3969/j.issn.0438-1157.2012.09.005

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Dynamic simulation of grade transition for ethylene slurry polymerization process based on simultaneous approach

LIU Mengmeng¹, ZHAN Zhiliang¹, SHAO Zhijiang¹, CHEN Xi¹, GU Xueping²

1. State Key Laboratory of Industrial Control Technology, Department of Control Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2. State Key Laboratory of Chemical Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2012-06-15 Revised:2012-06-22 Online:2012-09-05 Published:2012-09-05
Supported by:
supported by the National Basic Research Program of China(2012CB720503),the National Natural Science Foundation of China(61074148),the High-tech Research and Development Program of China(2012AA040305)and the Fundamental Research Funds for the Central Universities.

基于联立法的乙烯淤浆聚合牌号切换过程动态模拟

刘蒙蒙¹, 占志良¹, 邵之江¹, 陈曦¹, 顾雪萍²

1. 工业控制技术国家重点实验室, 浙江大学控制科学与工程系, 浙江杭州 310027;
2. 化学工程联合国家重点实验室, 浙江大学化学工程与生物工程学系, 浙江杭州 310027

通讯作者: 顾雪萍
作者简介:刘蒙蒙(1989-),女,硕士研究生。
基金资助:
国家重点基础研究发展计划项目(2012CB720503);国家自然科学基金项目(61074148);国家高技术研究发展计划项目(2012AA040305);中央高校基本科研业务费专项资金。

Abstract

Abstract: Dynamic rigorous model including kinetics and thermodynamics is established for the ethylene slurry polymerization plant.Thermodynamic properties are estimated by Kriging technique with the maximum relative error less than 2%.Based on the equation oriented model,control and state variables are synchronously discretized using orthogonal collocation finite elements(OCFE) method to develop simultaneous dynamic simulation for grade transition operations.The results are validated by comparing steady state data of five different grades obtained by Aspen Plus.The dynamic grade transition based on average molecular weight is also presented,which is close to that in Aspen Dynamic.

Key words: ethylene slurry polymerization, simultaneous approach, grade transition

摘要： 以乙烯淤浆聚合流程为研究对象,建立了包含动力学和热力学的动态机理模型,采用有限元正交配置法对控制变量和状态变量同步离散化,实现了全联立动态模拟。热力学物性计算采用Kriging函数估计,可适用于多个工况,最大误差不超过2%。利用Aspen Plus 5个牌号工况的数据,进行了模型稳态验证,并实现了牌号切换动态模拟,计算了平均分子量等质量指标,与Aspen Dynamic曲线吻合较好,为牌号切换的优化奠定了基础。

关键词: 乙烯淤浆聚合, 联立法, 牌号切换

CLC Number:

TQ325

LIU Mengmeng, ZHAN Zhiliang, SHAO Zhijiang, CHEN Xi, GU Xueping. Dynamic simulation of grade transition for ethylene slurry polymerization process based on simultaneous approach[J]. CIESC Journal, 2012, 63(9): 2703-2709.

刘蒙蒙, 占志良, 邵之江, 陈曦, 顾雪萍. 基于联立法的乙烯淤浆聚合牌号切换过程动态模拟[J]. 化工学报, 2012, 63(9): 2703-2709.

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Dynamic simulation of grade transition for ethylene slurry polymerization process based on simultaneous approach

基于联立法的乙烯淤浆聚合牌号切换过程动态模拟

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