Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

doi:10.1016/j.cjche.2023.03.023

Chinese Journal of Chemical Engineering ›› 2023, Vol. 62 ›› Issue (10): 281-290.DOI: 10.1016/j.cjche.2023.03.023

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Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

Xiaoqiang Fan^1,2, Jingyuan Sun², Jingdai Wang², Zhengliang Huang³, Zuwei Liao², Guodong Han⁴, Yongrong Yang²

1. Ningbo Research Institute, Zhejiang University, Ningbo 315100, China;
2. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
3. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou 310027, China;
4. Sinopec Tianjin Company, Tianjin 300271, China

Received:2022-11-27 Revised:2023-03-21 Online:2023-12-23 Published:2023-10-28
Contact: Jingyuan Sun,E-mail:sunjy@zju.edu.cn
Supported by:
The authors gratefully acknowledge financial supports from the Project of the National Natural Science Foundation of China (22178304, 22108239) and the Start-up Funding of Ningbo Research Institute of Zhejiang University (20201207Z0204).

Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

Xiaoqiang Fan^1,2, Jingyuan Sun², Jingdai Wang², Zhengliang Huang³, Zuwei Liao², Guodong Han⁴, Yongrong Yang²

1. Ningbo Research Institute, Zhejiang University, Ningbo 315100, China;
2. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
3. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou 310027, China;
4. Sinopec Tianjin Company, Tianjin 300271, China

通讯作者: Jingyuan Sun,E-mail:sunjy@zju.edu.cn
基金资助:
The authors gratefully acknowledge financial supports from the Project of the National Natural Science Foundation of China (22178304, 22108239) and the Start-up Funding of Ningbo Research Institute of Zhejiang University (20201207Z0204).

Abstract

Abstract: A set of hydrodynamic similarity laws is applied to the scale-up of ethylene polymerization fluidized bed reactors (FBRs) under the condensed mode operation. The thermal stability of open-loop controlled FBRs is investigated by the homotopy continuation method. And the Hopf bifurcation point is selected as an index of the thermal stability similarity. The simulation results show the similarity in state variables, operation parameters, the space–time yield (STY), and the thermal stability of FBRs with different scales. Furthermore, the thermal stability behaviors and similarity of the closed-loop controlled FBRs with different scales are analyzed. The observed similar trend of Hopf bifurcation curves reveals the similarity in the thermal stability of closed-loop controlled FBRs with different scaling ratios. In general, the results of the thermal stability similarity confirm that the hydrodynamics scaling laws proposed in the work are applicable to the scale-up of FBRs under the condensed mode operation.

Key words: Stability, Scale-up, Polymerization, Bifurcation theory, Fluidized bed

摘要： A set of hydrodynamic similarity laws is applied to the scale-up of ethylene polymerization fluidized bed reactors (FBRs) under the condensed mode operation. The thermal stability of open-loop controlled FBRs is investigated by the homotopy continuation method. And the Hopf bifurcation point is selected as an index of the thermal stability similarity. The simulation results show the similarity in state variables, operation parameters, the space–time yield (STY), and the thermal stability of FBRs with different scales. Furthermore, the thermal stability behaviors and similarity of the closed-loop controlled FBRs with different scales are analyzed. The observed similar trend of Hopf bifurcation curves reveals the similarity in the thermal stability of closed-loop controlled FBRs with different scaling ratios. In general, the results of the thermal stability similarity confirm that the hydrodynamics scaling laws proposed in the work are applicable to the scale-up of FBRs under the condensed mode operation.

关键词: Stability, Scale-up, Polymerization, Bifurcation theory, Fluidized bed

Xiaoqiang Fan, Jingyuan Sun, Jingdai Wang, Zhengliang Huang, Zuwei Liao, Guodong Han, Yongrong Yang. Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization[J]. Chinese Journal of Chemical Engineering, 2023, 62(10): 281-290.

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Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

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