Control of the DWC for separating the mixture of benzene，toluene，xylene

Abstract

Abstract: Control strategy and dynamic performance of dividing wall column for separating BTX were studied on the basis of steady-state simulation. PID parameters were tuned by using relay feedback test and Tyreus-Luyben settings. Comparative analysis of four typical composition control structures namely LV/DSB，DV/LSB，LB/DSV and LV/DSB were made on platform of Aspen Dynamic. Then the temperature control，temperature combined with composition control and temperature-composition cascade control strategies were inverstiagated on the basis of LV/DSB. The simulation results showed that DWCs have good controllability properties for various persistent disturbances in the feed flow rate and composition. Setting time TS and composition disturbances of the three desired products were all less than 2.97 h and 0.0015.

Key words: benzene, toluene, xylene, dividing wall column, dynamic simulation, control strategy

摘要： 在稳态模拟的基础上，研究了用于苯、甲苯、二甲苯分离的隔壁塔的控制策略和动态特性。动态模拟中采用继电反馈法和Tyreus-Luyben准则进行PID参数整定，在Aspen Dynamic平台上，对比分析了DB/LSV、DV/LSB、LB/DSV 和LV/DSB 4种典型组成控制策略的动态特性，并重点考察了LV/DSB基础上的温度控制、温度组成联合控制和温度组成串级控制策略。结果表明，当出现进料组成或流率干扰时，隔壁塔具有很好的可控性，调节时间TS最短至2.97 h，产品质量要求与设定值之间的摩尔最大偏差A最低至0.0015。

关键词: 苯, 甲苯, 二甲苯, 隔壁塔, 动态模拟, 控制策略

LI Jun1，WANG Chunzheng2，MA Zhanhua 1，SUN Lanyi1. Control of the DWC for separating the mixture of benzene，toluene，xylene[J]. Chemical Industry and Engineering Progree.

李军1，王纯正2，马占华1，孙兰义1. 隔壁塔用于苯、甲苯、二甲苯分离的控制[J]. 化工进展.

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Control of the DWC for separating the mixture of benzene，toluene，xylene

隔壁塔用于苯、甲苯、二甲苯分离的控制

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