催化裂化反再系统动态建模与仿真研究

Dynamic Modeling and Simulation of FCCU Reactor-Regenerator System

催化裂化是以重油为原料,反应生成轻质油产品的一项重要炼油工艺。针对并列式双器两段再生新工艺,建立了反应再生系统的动态机理数学模型,由5集总反应动力学模型和并列式双器两段再生器模型构成。采用Marquardt改进算法进行动态模型参数估计,利用4阶Runge-Kutta法对模型求解,得到了各集总组分分布图及主要变量稳态值。仿真结果表明,该模型具有较高的精度,为反应再生系统的先进控制和操作优化提供了支持。

Fluid Catalytic Cracking Unit（FCCU）is one of the most important processes in a refinery,which converts molecular-weight gas oils into lighter hydrocarbon products.The mechanistic dynamic model was developed for the FCCU reactor-regenerator system,which was composed of the five-lump dynamic mechanism model and the two-stage regenerator model.The Marquardt algorithm was adopted to evaluate model parameters,and fourth order Runge-Kutta method was used for the equations.Axial distribution of lump components in riser and key steady-state variable values were obtained.The results show that the model can describe the products rate with satisfied accuracy and can be used directly for the advanced control and process optimization.