蛇管与夹套冷却CSTR温度双重控制

连续搅拌釜式化学反应器(CSTR)是重要的化工设备。对蛇管与夹套双冷却CSTR单回路温度控制方案只利用一种操纵变量,无法兼顾动态性能与静态性能的不足进行了深入分析后,提出了CSTR温度双重控制系统方案。通过双重系统的协调控制,在温度出现偏差时由蛇管冷却器快速消除温度偏差,使温度迅速返回设定值;然后由冷却效率高的夹套冷却器逐步取代蛇管冷却器所承担的冷却负荷变化——即在动态过程,由动态性能好的操作变量(蛇管冷却器)进行控制,过渡过程短,动态偏差小;在平稳生产过程,CSTR冷却负荷主要由静态性能好的操作变量(夹套冷却器)承担,冷却效率高,冷却水用量少。CSTR温度双重控制充分发挥了CSTR蛇管与夹套冷却器各自的优势,使CSTR温度控制的动态性能与静态性能都达到较为理想水平。最后,通过半实物仿真实验验证了CSTR温度双重控制在动态性能和节能降耗二方面的优越性。该双重控制方案可应用于具有类似结构特征的其他生产系统。

Temperature dual control of CSTR with coil cooler and jacket cooler

The CSTR is important chemical industrys.The temperature dual temperature control system solution is proposed for CSTR with coil cooling and jacket cooling after researching the insufficiency the single loop control using only one manipulating variable and to be incapable satisfy the dynamic and static performance simultaneity.Under the dual control system,the coil cooler eliminates quickly the error and the temperature returns to set value as soon as the CSTR temperature error appear,then the coil cooler load variety for the CSTR cooling is replaced gradually by the more efficient jacket cooler,namely,CSTR temperature is controlled by the manipulating variable possessing finer dynamic property(coil cooler) in dynamic process,transition shorter and dynamic error smaller;and in the stable process,the main cooling load in the CSTR is shouldered by the jacket cooler,more cooling efficient and lower consumption of cooling water.The dual control solution takes advantage of coil cooling and jacket cooling respectively,so that both dynamic and static characteristic of the CSTR temperature control get more ideal.Finally,the advantage of the CSTR temperature dual control is verified for control precision and dynamic response,and energy-saving and consumption reducing by the semi-physical simulation.The dual control systems solution can also be applied to other production equipment or system with the similar structure features.