聚丙烯反应升温优化控制的设计与实现

Design and Realization of the Optimized Heating Control for Propylene Polymerization Reaction

针对间歇丙烯聚合过程中的非线性、时变性和纯滞后特性,提出一种基于集散控制系统实现丙烯聚合反应的优化控制方案。给出了软手操、预测函数控制(PFC)和PID优化控制相结合的升温控制策略,并详细介绍了方案设计、PFC模块组态与参数设定、消除方案切换波动等问题。运行结果表明,该方案在升温阶段(60～75℃)的跟随性好、控制精度高,在恒温恒压阶段(75℃,3.5 MPa)的超调小,较好地满足了设计要求。

Aiming at the features of intermittent polymerization process of propylene, e.g. , nonlinearity, time varying and pure time delay, the DCS-based optimized control strategy for propylene polymerization reaction is proposed. The heating control strategy that is composed of soft manual operation, predictive function control （ PFC ） and PID optimized control is given. The design of the strategy, configuration and parameter setting of PFC module, and the elimination of fluctuation due to strategy switching are introduced in detail. The result of operation shows that the strategy offers good follow up performance and high control accuracy in heating phase （60 -75 ℃ ） ; and small overshooting in constant temperature and pressure phase （75 ℃, 3.5 MPa） , to well meet the requirement of design.