PTA装置溶剂脱水系统中共沸剂回收塔的动态模拟及控制  

Dynamic Simulation and Control of Entrainer Recovered Tower in Solvent Dehydration System of PTA Plant

作　　者：黄秀辉 王俊[1] 王应飞 李泽秋 HUANG Xiu-hui;WANG Jun;WANG Ying-fei;LI Ze-qiu(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《华东理工大学学报（自然科学版）》2018年第4期548-556,共9页Journal of East China University of Science and Technology

基　　金：上海高校青年教师培养资助计划(ZZsl15002;ZZsl15006)

摘　　要：针对以醋酸正丙酯为共沸剂的工业醋酸回收系统中的共沸剂回收塔,基于Aspen Plus和Aspen Dynamics平台在稳态模型的基础上对其进行了动态模拟及动态控制策略研究,设计了两种控制结构并分别对其动态响应特性进行了分析。结果表明,本文方法通过直接调节供热流股来控制灵敏板温度具有更好的控制性能,并且能在扰动出现后更快、更稳地达到所需分离要求,回到稳态值、缩短过渡过程并减少相应的物耗及能耗损失,为以后进行共沸剂回收过程的动态实时优化、先进控制等研究以及实现PTA装置的高效优化运行提供有用的理论基础。In the production of pure terephthalic acid （PTA）, acetic acid （HAc） recovery system is one of the most important operation units. p-Xylene （PX） is oxidized to form PTA using HAc as the solvent, and water is generated in the reaction process, while there are unreacted reactant PX and by-product methyl acetate （MA） in the HAc solvent besides water. To reduce material consumption, the solvent mixture should be separated and concentrated for recycling by azeotropic distillation with an entrainer introduced into the system. How to realize the optimized operation of the process has always been the focus as well as a difficulty of the research. In recent years, most of the researches about the HAc dehydration system were dedicated to the issues of process synthesis, steady-state simulation and optimal design. A few works focused on the dynamic simulation and control of the process, but mainly aimed at the HAc dehydration tower. This paper is aimed at the dynamic simulation and control of another important tower of the system：entrainer recycle tower. Based on the steady-state model of our previous research, the dynamic simulation of entrainer recycle tower in the industrial acetic acid recovery system using n-propyl acetate as entrainer is carried out on the basis of Aspen Plus and Aspen Dynamics. Two kinds of dynamic control structures are designed for studying the dynamic control strategy to realize both high-efficiency and stability of the operation. The strategy 1 chooses sensitive board temperature signal to control the proportion of flow controllers, and the sensitivity of the plate temperature is used as a proportional controller＇s parameters to indirectly adjust. The strategy 2 chooses temperature-flow cascade controller to control heating through the measured sensitivity plate temperature directly, to adjust the separation tower by flow S3 flow. Then, the dynamic response is analyzed. In view of the simple structure of strategy 2, when the adjustment time and the stable value of strategy 1 a

关 键 词：醋酸回收系统 共沸剂回收塔 动态模拟 动态控制 

分 类 号：TQ028.4[化学工程]