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A hybrid control approach for the cracking outlet temperature system of ethylene cracking furnace

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Abstract

The main objective of this paper is to show the design and application on the cracking outlet temperature (COT) system using a hybrid control approach including non-minimal state-space model predictive control with an adjustable factor (AFNMSSMPC) and humanoid intelligent multimodality control (HIMMC) in two 100 k tone/year SC-1 ethylene cracking furnaces. Compared with the conventional control structure, the advanced control structure is designed based on the existing control problem. The advanced controller is developed at the platform of APC-ISYS software made by Zhejiang Supcon Company and implemented in an industrial upper computer which sets over and is connected with a CS3000 distributed control system (DCS) through OPCServer. In order to reduce the fluctuation of the COT, AFNMSSMPC is chosen as feedback controller, which guarantees system robustness together with tracking ability, and meanwhile HIMMC is as feed-forward controller based on the change in chamber temperature (measured disturbance), which can eliminate the effect on cracking outlet temperature (COT) in advance. The application results on COT of two ethylene cracking furnaces labeled M and N furnaces in practice using AFNMSSMPC-HIMMC compared to the traditional proportional–integral–differential (PID) control are presented. The standard deviation of COT reduces by 54.03% and 60.87% for M and N furnaces, respectively. The results show that the designed COT system has the capability of good tracking and strong disturbance rejection.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant 61673199, 61703191, Natural Science Foundation of Liaoning Province 20180550905 and Natural Science Fund Project of Liaoning Province 2019-KF-03-05.

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Correspondence to Chengli Su or Ping Li.

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The authors declare no conflict of interest.

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Cite this article

Shi, H., Peng, B., Jiang, X. et al. A hybrid control approach for the cracking outlet temperature system of ethylene cracking furnace. Soft Comput (2020). https://doi.org/10.1007/s00500-020-04679-0

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Keywords

  • Cracking outlet temperature
  • Advanced control
  • Non-minimal state space
  • Predictive control
  • Ethylene cracking furnace