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Steady-state and dynamic simulation of gas phase polyethylene process

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Steady-state and dynamic simulation of gas phase polyethylene process
Gas-phase polyethylene(PE)processes are among the most important methods for PE production.A deeper understanding of the process characteristics and dynamic behavior,such as properties of PE and reactor stability,holds substantial interest for both academic researchers and industries.In this study,both steady-state and dynamic models for a gas-phase polyethylene process are established as a simulation platform,which can be used to study a variety of operation tasks for commercial solution polyethylene processes,such as new product development,process control and real-time optimization.The copolymerization kinetic parameters are fitted by industrial data.Additionally,a multi-reactor series model is developed to characterize the temperature distribution within the fluidized bed reactor.The accuracy in predicting melt index and density of the polymer,and the dynamic behavior of the developed models are verified by real plant data.Moreover,the dynamic simulation platform is applied to compare four practical control schemes for reactor temperature by a series of simulation experiments,since temperature control is important in industrial production.The results reveal that all four schemes effectively track the setpoint temperature.However,only the demineralized water temperature cascade control demonstrates excellent performance in handling disturbances from both the recycle gas sub-system and the heat exchange subsystem.

Gas-phase polyethylene processSteady stateDynamic modelingControl

Xiaodong Hong、Wanke Chen、Zuwei Liao、Xiaoqiang Fan、Jingyuan Sun、Yao Yang、Chunhui Zhao、Jingdai Wang、Yongrong Yang

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State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China

Engineering Research Center of Functional Materials Intelligent Manufacturing of Zhejiang Province,ZJU-Hangzhou Global Scientific and Technological Innovation Center,Hangzhou 311215,China

Ningbo Research Institute,Zhejiang University,Ningbo 315100,China

State Key Laboratory of Industrial Control Technology,College of Control Science and Engineering,Zhejiang University,Hangzhou 310027,China

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Gas-phase polyethylene process Steady state Dynamic modeling Control

2024

10.1016/j.cjche.2024.07.026

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.75(11)