摘要
针对乙苯催化脱氢制苯乙烯过程的特点,给出多输入多输出系统的预测函数控制算法应用设计。同时基于Lyapunov函数方法分析了闭环控制系统的稳定性能,是判断不确定性存在时控制系统具有鲁棒能力的一种定量指标。选取某苯乙烯厂乙苯进量、蒸汽过热炉A出口温度、蒸汽过热炉B出口温度、主蒸汽流量、压缩机入口压力5个量为控制输入,乙苯脱氢转化率及脱氢选择性为被控变量,应用所设计预测函数控制算法实现了脱氢系统的控制。实验结果表明,该算法对于乙苯脱氢生产过程具有好的鲁棒性和抗干扰性。
For the dehydrogenation of ethylbenzene to styrene, a predictive functional control algorithm was presented. The robust stability conditions of the closed-loop system quantitatively based on Lyapunov function was provided to assure the stability of the designed closed-loop system. Furthermore, the presented algorithm was applied to a styrene unit, in which ethylbenzene feed, outlet temperatures of furnace A and furnace B, steam flowrate, inlet pressure of compressor were manipulated variables, and the conversion rate and selectivity of the process of dehydrogenation of ethylbenzene to styrene were controlled variables. Despite perturbation, the simulations showed that the presented algorithm could guarantee the conversion rate in an expected range, which was attributed to the stability of production.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第7期1640-1645,共6页
CIESC Journal
关键词
预测函数控制
乙苯脱氢过程
鲁棒稳定性
转化率
predictive functional control
dehydrogenation of ethylbenzene
robust stability condition
conversion rate
