Receding horizon control for grade transition of large-scale polypropylene production plants

HE Defeng; ZOU Tao; YU Li

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Receding horizon control for grade transition of large-scale polypropylene production plants

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- Receding horizon control for grade transition of large-scale polypropylene production plants
- CIESC Journal Issue 2, Pages: 405-412(2010)
- 作者机构：
  
  浙江工业大学信息工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 February 2010，
  
  Published：05 February 2010
- 稿件说明：
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HE Defeng, ZOU Tao, YU Li. Receding horizon control for grade transition of large-scale polypropylene production plants[J]. CIESC Journal, 2010, (2): 405-412.
DOI：

HE Defeng, ZOU Tao, YU Li. Receding horizon control for grade transition of large-scale polypropylene production plants[J]. CIESC Journal, 2010, (2): 405-412. DOI：

摘要

基于滚动时域优化控制策略，提出了一种大型双环管聚丙烯生产过程最优牌号切换控制方法。首先结合机理分析，以Hammerstein模型描述聚丙烯牌号切换过程中质量指标动态特性;其次，根据牌号切换的性能指标，滚动优化计算每个时刻各反应器中聚合温度、氢气与丙烯浓度比、共聚单体乙烯与丙烯浓度比等操作变量。进一步结合双层控制结构和状态观测器设计，实现聚丙烯产品牌号切换的滚动优化闭环控制，并预测聚合物产品各质量指标的动态轨迹。最后，通过给出多个牌号切换实例仿真验证本文结果的有效性和实用性。

Abstract

Based on the receding horizon optimized control strategy

an optimal control method of grade transition was presented for the large-scale bi-tubular polypropylene production process.Firstly

with mechanism analysis

the Hammerstein model was used to represent the dynamics of resin quality in the grade transition process.Secondly

by receding optimization of the performance index of grade transition

the controlled variables in all reactors were computed in each sampling time

such as polymerization temperature

ratio of hydrogen to propylene and ratio of ethylene to propylene.Moreover

introducing the two-tie control structure and design of state estimator yielded receding optimized closed-loop control of polypropylene grade transition and predicted the dynamic trajectories of the polymer quality in all bi-tubular reactors.Finally

an example of simulation of multi-grade transition control was used to illustrate the effectiveness of the result in this paper.

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