CIESC Journal ›› 2016, Vol. 67 ›› Issue (8): 3491-3498.DOI: 10.11949/j.issn.0438-1157.20160414

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Self-optimizing control based on multi-objective optimization for heavy oil catalytic pyrolysis in two-stage riser

WANG Ping1,2, ZHAO Hui1, YANG Chaohe1   

  1. 1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, China;
    2 College of Information and Control Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2016-04-01 Revised:2016-06-13 Online:2016-08-05 Published:2016-08-05
  • Supported by:

    supported by the National Basic Research Program of China (2012CB215006) and the Fundamental Research Funds for the Central Universities (2015010109).

基于多目标优化的两段提升管重油催化裂解自优化控制

王平1,2, 赵辉1, 杨朝合1   

  1. 1 中国石油大学(华东)重质油国家重点实验室, 山东 青岛 266580;
    2 中国石油大学(华东)信息与控制工程学院, 山东 青岛 266580
  • 通讯作者: 杨朝合
  • 基金资助:

    国家重点基础研究发展计划项目(2012CB215006);中央高校基本科研业务费专项资金项目(2015010109)。

Abstract:

Considered economic requirement for maximizing propylene yield of fluidized catalytic pyrolysis process in two-stage riser, as well as complex characteristics of the FCC process such as strong nonlinearity, coupling multivariable and unavailability in online measurement of product yields, a self-optimizing control strategy on a basis of multi-objective optimization was proposed. First, a multi-objective optimization framework for maximizing propylene yield while minimizing dry gas output was created from steady state model and operational constraints of the process, and solved for optimal operation condition with a complete and uniform Pareto distribution by standardized normal constraint method. Secondly, a self-optimizing scheme of cascade controls was generated from relationships between the optimal operation condition and the active constraints. Product yield that could not be measured online were estimated by an unscented Kalman filter transformation. Compared to the tracking control on temperature setpoints at the riser outlet, the self-optimizing control method could spontaneously adjust operating condition under circumstances of interference and reduce the disadvantageous impact of noise factors to optimizing process operation.

Key words: optimization, process control, numerical simulation, catalytic pyrolysis, two-stage riser

摘要:

针对两段提升管重油催化裂解过程经济运行要求和工艺特点,从多目标优化角度出发,提出一种自优化控制方法。首先,基于过程稳态模型,考虑操作约束条件,构造同时最大化丙烯产量和最小化干气产量的多目标操作优化问题,并采用标准化法向约束方法求解获得完整、均匀分布的Pareto最优解;然后,根据多目标优化结果所揭示的最优操作条件与积极约束之间的关系,提出了一种基于串级控制的自优化控制策略。仿真结果表明,与传统的提升管出口温度设定值跟踪控制相比,本文方法在干扰作用下能够及时调整操作条件,降低干扰对过程优化运行的不利影响。

关键词: 优化, 过程控制, 数值模拟, 催化裂解, 两段提升管

CLC Number: