Abstract: 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.

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摘要： 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Mar quardt 改进算法进行动态模型参数估计, 利用4 阶Rung e -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。

关键词: 催化裂化 , 反再系统 , 机理建模 , 动态仿真