Closed-loop optimization of ethylene cracking furnace based on online measurement of methane yield

doi:10.16085/j.issn.1000-6613.2015.05.011

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (05): 1246-1253.DOI: 10.16085/j.issn.1000-6613.2015.05.011

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Closed-loop optimization of ethylene cracking furnace based on online measurement of methane yield

MEI Hua¹, WANG Zhe², HE Yanfeng^1,2, WANG Zhenlei¹

1. Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;
2. Olefin Department, Sinopec Shanghai petrochemical company limited, Shanghai 200540, China

Received:2014-10-08 Revised:2014-12-29 Online:2015-05-05 Published:2015-05-05

基于甲烷收率在线测量技术的乙烯裂解炉闭环优化方法

梅华¹, 王哲², 何燕锋^1,2, 王振雷¹

1. 华东理工大学化工过程先进控制和优化技术教育部重点实验室, 上海 200237;
2. 中国石化上海石油化工股份有限公司烯烃部, 上海 200540

通讯作者: 王振雷,教授,博士生导师,从事复杂化工过程控制、建模与优化方法、故障检测与诊断等领域的研究.E-mailwangzhen_l@ecust.edu.cn.
作者简介:梅华(1977—),男,博士,讲师,从事过程控制、建模与优化方法及工程应用的研究.E-mailhmei2006@ecust.edu.cn.
基金资助:
国家自然科学基金项目(U1162202)、“十二五”国家科技支撑计划项目(2012BAF05B00)、上海市科技攻关项目(12dz1125100)、上海市“科技创新行动计划”研发平台建设项目(13DZ2295300)及上海市重点学科建设项目(B504).

Abstract

Abstract: Due to insufficient information on the absolute yields of the cracking product distribution,the existing optimization strategies for ethylene cracking furnace need to predict the cracking product distribution based on some cracking reaction models,and optimize the cracking furnace operation in an open-loop mode. The results of the optimization depend on the accuracy of the models. In this paper presented online measurement of methane yield (by weight),an important parameter in the cracking furnace operation,by modifying the cracking gas online sampling system in the ethylene cracking furnace. A closed-loop optimization method was proposed in order to obtain optimal ethylene and propane yield based on the online data of olefin-to-methane ratio(OMR),which was used in the iterative calculation of coil output temperature(COT). The proposed method was able to minimize the nonlinearity of the sensitive functions and the measuring errors of the online analyzers. In addition,this optimization procedure was independent on the feedstock properties and cracking reaction models,allowing less investment for the optimal system,and thus could have prospective industrial applications.

Key words: ethylene cracking furnace, methane yield, gas-liquid flow, separation, closed-loop optimization

摘要： 由于缺乏裂解产物收率绝对量信息,现有的乙烯裂解炉优化策略需要依靠裂解反应模型对裂解产物分布进行预测并依此进行开环优化计算,其优化结果完全依赖于裂解反应机理模型的精度.本文通过改进乙烯裂解炉裂解气取样系统实现了甲烷质量收率这一关键参数指标的在线测量,并在此基础上进一步提出一种裂解炉闭环优化运行新方法.该方法针对乙烯和丙烯收率和(简称“双烯”收率)最大这一优化目标,根据甲烷收率和双烯/甲烷比(烯甲比)的在线测量数据迭代求解获得最优炉管出口温度(COT).该方法采用闭环迭代寻优的方式,能够有效克服灵敏度函数的非线性以及在线分析仪表本身的测量误差,具有良好的鲁棒性;另一方面,由于不需要借助任何裂解原料与裂解反应模型,从而大大减少了裂解炉优化系统实施的投资,因此具有很好的工业应用前景.

关键词: 乙烯裂解炉, 甲烷收率, 气液两相流, 分离, 闭环优化

CLC Number:

MEI Hua, WANG Zhe, HE Yanfeng, WANG Zhenlei. Closed-loop optimization of ethylene cracking furnace based on online measurement of methane yield[J]. Chemical Industry and Engineering Progree, 2015, 34(05): 1246-1253.

梅华, 王哲, 何燕锋, 王振雷. 基于甲烷收率在线测量技术的乙烯裂解炉闭环优化方法[J]. 化工进展, 2015, 34(05): 1246-1253.

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Closed-loop optimization of ethylene cracking furnace based on online measurement of methane yield

基于甲烷收率在线测量技术的乙烯裂解炉闭环优化方法

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