催化裂化装置动态机理模型的应用——反应控制策略分析

APPLICATION OF DYNAMIC MECHANISM MODEL OF FLUID CATALYTIC CRACKING UNIT ——Analysis of Reaction Control Strategies

应用催化裂化装置动态机理模型及其仿真软件平台， 对反应温度和反应热两种反应控制策略进行了分析比较。在反应压力控制回路处于开环的情况下，反应温度控制时系统不稳定，而采用反应热控制时系统则是稳定的。反应压力闭环控制后，从控制器给定值改变后各变量的动态响应来看，反应温度控制时系统动态变化时间较长， 各变量变化幅度较大， 而采用反应热控制时系统动态变化时间短， 各变量变化幅度也较小。

The simulator (HERS) for software Windows (Microsoft) and the dynamic mechanism model of fluid catalytic cracking unit(FCCU)with a high efficiency regenerator were applied to the analysis of the reaction control strategies.The simulated results of the reaction temperature controlled method and the reaction heat controlled method were compared with that of PID conventional method.As the reactor pressure controller is at the open loop position,with the reaction temperature controlled the reactor/regenerator section of the unit is unstable,while it is stable with reaction heat controlled.As the reactor pressure is under control,according to the transient responses to the step wise changes of the setpoint of the controlled variables,the system with reaction temperature controlled has larger overshoot than that with reaction heat controlled.It is concluded that controlling the cracking reaction within the riser reactor with reaction heat control is better than that with reaction temperature control.