Reactor Model Of Counter-current Continuous Catalyst-regenerative Reforming Process

The catalytic reforming process is important in the refining and petrochemical industries.The traditional continuous reforming has the disadvantages that the catalyst activity in each reactor does not match the reaction requirements very much.The emergence of the counter-current continuous catalyst-regenerative reforming technology solves this problem,making it possible for catalyst activity to be better applied.Nowadays,it plays a more and more important role in the catalytic reforming process.In this paper,according to the guiding principles of lumping theory,a new kinetic model involving 44 lumped pseudo-components and 70 reactions for catalytic reforming was developed to satisfy the commercial counter-current continuous catalyst-regenerative reforming unit.Besides,to meet the requirements of real-time optimization,the reactor model was constructed with the Equation Oriented method,which takes less time than the traditional Sequential Modular method and can avoid the problem of non-convergence.To construct EO equations,the orthogonal collocation method was used to transform the differential equations of the model into algebraic equations.In this study,the model kinetic parameters were obtained by Sequential Quadratic Programming method on MATLAB.The validation results showed that the good agreement of material compositions and catalyst coke content at the exit of the fourth reactor,as well as the temperature and pressure at the exit of each reactor,was obtained between simulated values and actual values.Among them,the average relative errors of temperature and pressure are 0.23%and 0.47%,respectively;the relative average error of carbon deposition is 3.57%;the average absolute error of molar flow rate of components is 0.33kmol/h.Moreover,the reactor kinetic model was also used to predict the influence of process parameters.The combination conditions were also optimized.This model has high computational efficiency,which can provide a good foundation for real-time optimization of the counter-current continuous catalyst-regenerative reforming.