Abstract
The dynamic simulation of the continuous catalytic reforming process is of great significance to the performance prediction and optimization of the entire process. In this study, a 34-lumped mechanism model described by differential algebra was established based on the actual process conditions of the continuous catalytic reforming process in China, and an efficient dynamic simulation solution method based on simultaneous equations was proposed. First, a 34-lumped differential–algebraic mechanism model was established based on the basic principles of reforming kinetics, thermodynamics, material balance, and energy balance. Secondly, in order to solve and simulate the mechanism model composed of 144 differential equations and several algebraic equations, the method of finite-element collocation is used to discretize the differential equations and convert them into large-scale, nonlinear programming problems, and the interior point algorithm is used to estimate its parameters and verify the model. In addition, in order to avoid the problem of too long derivative solution time and too large memory in the solution process, methods such as sparse derivative and Broyden–Fletcher–Goldfarb–Shanno (BFGS) with limited storage are used to solve the problem. Finally, on the basis of model verification, dynamic simulation and sensitivity analysis of the whole process are carried out by modifying different input parameters. The results show that the mechanism model and solution method presented in this paper can quickly and accurately simulate the continuous catalytic reforming process dynamically.
Highlights
Continuous catalytic reforming is one of the main processing techniques in the petrochemical industry
Based on the basic principles of reforming kinetics, thermodynamics, material balance, energy balance, etc., a 34-lumped mechanism model described by differential algebra is established in this paper
The differential equations are discretized through the simultaneous equations method of finite-element collocation to transform them into large-scale nonlinear programming problems, so as to solve and simulate the mechanism model consisting of 144 differential equations and several algebraic equations, and adopt the internal point algorithm for parameter estimation and model verification
Summary
Continuous catalytic reforming is one of the main processing techniques in the petrochemical industry. Compared with foreign countries, researches on lumped reaction kinetic models in China are relatively late, mainly including the following: Based on Ramage’s 13-component lumped reaction kinetics model, Weng et al lumped n-alkanes and isoparaffins separately, and proposed a 16-component lumped reaction kinetic model. In order to make the continuous catalytic reforming process run better, this paper established a general mechanism model in line with the actual situation of our country, and combined the more efficient and rapid dynamic simulation method with it, which would improve the yield and obtain better economic benefits.
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