Multivariable predictive control of p-xylene oxidation reaction process

doi:10.3969/j.issn.0438-1157.2012.09.009

CIESC Journal ›› 2012, Vol. 63 ›› Issue (9): 2726-2732.DOI: 10.3969/j.issn.0438-1157.2012.09.009

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Multivariable predictive control of p-xylene oxidation reaction process

XING Jianliang¹, ZHAO Jun², JIANG Pengfei², ZHONG Weimin³, YUAN Weikang¹

1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Department of Control Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
3. Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2012-06-15 Revised:2012-06-20 Online:2012-09-05 Published:2012-09-05
Supported by:
supported by the National Natural Science Foundation of China(61174118),the Major State Basic Research Development Program of Shanghai(10JC1403400),the Shanghai Leading Academic Discipline Project (B504) and Zhejiang Province Public Welfare Science and Technology Project(2011C21077).

PX氧化反应过程多变量预测控制

邢建良¹, 赵均², 蒋鹏飞², 钟伟民³, 袁渭康¹

1. 华东理工大学化学工程联合国家重点实验室, 上海 200237;
2. 浙江大学控制科学与工程学系, 浙江杭州 310027;
3. 华东理工大学化工过程先进控制与优化技术教育部重点实验室, 上海 200237

通讯作者: 袁渭康
作者简介:邢建良(1965-),男,教授级高工。
基金资助:
国家自然科学基金项目(61174118);上海市基础研究重点项目(10JC1403400);上海市重点学科建设项目(B504);浙江省公益科技项目(2011C21077)。

Abstract

Abstract: Purified terephthalic acid is one of the most important chemical raw materials.p-Xylene oxidation is a solid-liquid phased catalytic reaction process under high temperature and high pressure.The reactor is the core unit of purified terephthalic acid plant,which affects the product yield and quality noticeably.Current traditional control strategy can meet the demands of the industrial operation,but the variation of the key quality indexes-the concentration of 4-carboxybenzaldehyde in crude terephthalic acid and the oxygen content in the exhaust are big,which influence the further optimization of the process.In this paper,in order to solve this problem,a multivariable predictive control strategy fulfilled by the FRONT-Suite software is put forward.After the application,the control performance on the 4-carboxybenzaldehyde concentration in crude terephthalic acid and oxygen content in the exhaust of p-xylene oxidation process are improved obviously.

Key words: purified terephthalic acid, p-xylene oxidation reaction, multivariable predictive control

摘要： 精对苯二甲酸(purified terephthalic acid,PTA)是我国最重要的化工原料之一。对二甲苯(p-xylene,PX)氧化反应器是PTA装置的核心运行设备,PX氧化反应是高温高压下的固液相催化反应,其关系到整个装置的产量和消耗。目前,PX氧化反应过程的常规控制虽然可以满足工业装置的生产,但关键产品指标粗对苯二甲酸中对羧基苯甲醛(4-carboxybenzaldehyde,4-CBA)含量和尾气氧浓度波动范围较大,不利于工业装置的进一步优化操作。本文利用FRONT-Suite先进控制软件进行了工业PTA装置PX氧化反应过程的多变量预测控制,稳定优化了关键控制指标反应器尾氧浓度和第一结晶器尾氧浓度以及质量指标4-CBA含量的控制,取得了显著的控制效果。

关键词: 精对苯二甲酸, 对二甲苯氧化反应, 多变量预测控制

CLC Number:

XING Jianliang, ZHAO Jun, JIANG Pengfei, ZHONG Weimin, YUAN Weikang. Multivariable predictive control of p-xylene oxidation reaction process[J]. CIESC Journal, 2012, 63(9): 2726-2732.

邢建良, 赵均, 蒋鹏飞, 钟伟民, 袁渭康. PX氧化反应过程多变量预测控制[J]. 化工学报, 2012, 63(9): 2726-2732.

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Multivariable predictive control of p-xylene oxidation reaction process

PX氧化反应过程多变量预测控制

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