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精对苯二甲酸(Pured Terepthalic Acid,PTA)作为工业上生产聚酯的重要原料,主要是由对二甲苯(p-xylene,PX)在高温下液相催化氧化获得。PX氧化的生产过程是一个多变量、多尺度、动态、强耦合、非线性的复杂系统,而目前工业上应用较多的传统单回路PID(比例、积分、微分)控制在处理复杂的多变量系统时存在很多不足。为此,在所建立的基于Aspen Dynamics的PX氧化反应器动态模型基础上,采用动态矩阵多变量预测控制(DMC)方法对反应器的平稳控制进行仿真研究。仿真结果表明,由于该动态模型是基于机理建立的,能够较好反映实际工业反应过程,以此为基础建立的DMC多变量预测控制方法对对PX氧化反应过程的平稳控制具有良好的效果,可以作为指导工业预测控制实施的依据。
Pured Terepthalic Acid (PTA), as an important raw material for industrial production of polyester, is mainly obtained by liquid phase catalytic oxidation of p-xylene (PX) at high temperature. The production process of PX oxidation is a multi-variable, multi-scale, dynamic, strongly coupled and nonlinear complex system. At present, the traditional single-loop PID (Proportional, Integral, Derivative) There are many deficiencies in the system. Based on the established dynamic model of PX oxidation reactor based on Aspen Dynamics, a dynamic matrix multivariable predictive control (DMC) method is used to simulate the steady control of the reactor. The simulation results show that this dynamic model is based on mechanism and can well reflect the actual industrial reaction process. The DMC multivariable predictive control method based on this model has a good effect on the steady control of PX oxidation reaction. As a guide to guide the implementation of industrial forecasting control.