氯乙烯精馏高沸塔的双层结构模型预测控制策略  

Double-layered Model Predictive Control Strategy of High Boiling Column of Vinyl Chloride Distillation

作　　者：苏宝玉[1] 邹涛[2] 臧春华[1] 孔庆儒[3] 

机构地区：[1]沈阳化工大学信息工程学院,辽宁沈阳110142 [2]中国科学院沈阳自动化研究所,辽宁沈阳110016 [3]沈阳华控科技发展有限公司,辽宁沈阳110142

出　　处：《信息与控制》2015年第4期403-410,共8页Information and Control

基　　金：国家自然科学基金资助项目(61374112);中国科学院网络化控制系统重点实验室自主课题资助项目(WLHKZ2014010)

摘　　要：针对氯乙烯精馏高沸塔存在的高耗能,多变量耦合,大滞后,高沸物排放控制及回流优化问题,提出一种高沸塔双层结构模型预测控制策略.该策略考虑了精馏段的温差,在实现高沸塔精馏过程控制的前提下,具有优化回流节能的功能.通过考虑塔底温度和塔底液位设计出高沸物排放逻辑,并结合双层结构模型预测控制实现高沸物自动排放.最后实验仿真结果表明该方法可以减少进料流量变化引起的过程波动、实现高沸物自动排放和优化回流.A double-layered model predictive control strategy is designed for the process of vinyl chloride distillation in order to address problems associated with high energy consumption, multivariable coupling, large time delays, high-boiling compounds that cannot be automatically discharged, and reflux optimization control of a high-boiling column. The strategy considers the temperature difference of the rectification section; thus, with the aim of achie- ving process control in high-boiling column distillation, the developed strategy optimizes reflux energy savings. In addition, the logic associated with the auto discharge of high-boiling compounds is designed by considering the rec- tifier-bottom temperature and level, and it is shown that this logic is effective for its purpose. Simulation results show that the proposed strategy can indeed reduce the process fluctuation of high-boiling columns caused by feed disturbance and achieve auto discharge of high-boiling compounds and optimization of the reflux.

关 键 词：氯乙烯精馏 高沸塔 高沸物 模型预测控制 温差控制 稳态优化 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]