Dynamic Modelling And Simulation Of An R2R FCCU Reactor-regenerator Section

In this paper, through mechanism analysis, a dynamic model of R2R (one riser and two regenerators) Fluidized catalytic cracking unit (FCCU) reactor-regenerator section is established. The dynamic model is consists of 6 parts altogether, reactor riser, stripping - disengaging section, first stage regenerator, lift part, second stage regenerator and control system, separately. Six lumps kinetic models are used in riser model, and the paper establish pseudo-steady model that think about axial coordinate in the riser; as the same as the riser, it is established a pseudo-steady tubular reactor model for lift; the paper assump stripping - disengaging section, first stage regenerator, second stage regenerator as continuous stirred tank, differently, cracking reaction isn't accured in stripping - disengaging section, and combustion reaction is accured in first stage regenerator and second stage regenerator. The paper determines the relationship of each important variables, and designs control scheme of R2R FCCU reactor-regenerator section. The control scheme includes 6 control loops. In the paper, the control loops are controlled by incremental PID algorithm. And then, solving the model with Matlab. Moreover, the simulation experiment is carried out. According to analysis on the reactor-regenerator section step curve, we have proved the models are available.Using modeling and control of FCC unit, the model is connected with the operation situation tightly for analyzing plant operation situation, optimizing production operation and so on. For the purpose of executing about production plans, it will make a good directive function. It will offer the theoretical basis for the improvement of models.