先进控制在线性低密度聚乙烯生产中的应用.doc

先进控制在线性低密度聚乙烯生产中的应用黄华杰 The Application of Advanced Process Control to Polyethylene Processes Huang Huajie 摘要: 线性低密度聚乙烯作为工业生产的重要原料, 基于非线性特性差、检测周期长等特点, 常规控制已无法满足平稳生产的要求。本文通过对反应器内部各组分的动态情况进行模拟, 对产品的质量进行预测,采用 Aspen 公司 Apollo 软件对产品质量、反应器的总压、乙烯分压、反应器温度进行先进控制。结果表明,机理模型能反映物质在反应器内真实情况, 通过先进控制可以实现各项指标的平稳控制,稳定生产。 Abstract: Linear low density polyethylene (LLDPE) as an important raw material for Industrial production, due to highly nonlinear and lack of on-line analyzer Etc, is difficult to control by the traditional process control techniques for the requirements of stable production. In this paper, the trends of ponent in the reactor were simulated by theoretical algorithm, the quality of product was predicted. The pressure of the reactor, the partial pressure of ethylene, the temperature of the reactor, the quality of LLDPE were controlled by the Apollo software supplied by the pany. The results show that the simulative and the actual trends of ponent in the reactor were closely, the simulative results can reflect the actual trends. The target that steady control and stable production can been achieved by the advanced process control. 关键词:先进控制;线性低密度聚乙烯;产品质量;机理模拟 Key words: advanced process control; linear low density polyethylene; the quality of product; theoretical model 1. 引言聚乙烯是合成树脂工业中的重要原料, 在国民经济中发挥着重要的作用, 聚乙烯的产量常用作为工业发展的标度。但是工业聚合过程是一类典型的多变量非线性系统, 在生产中精密控制聚乙烯的主要质量指标( 熔融指数和密度) 有很大的难度