Software Development Of Lumped Kinetic Model For Heavy Oil Fluid Catalytic Cracking

Based on the characteristics of reaction mechanism and product distribution in residue fluid catalyst cracking (RFCC) process, a 12-lumped reaction network for RFCC process was constructed and the mathematical expression of the kinetic model equation was established. The kinetic parameters of the model are solved by the method combining the Runge-Kutta method and the BFGS algorithm. Based on the commercial considerations, the software of 12-lumped kinetic model for RFCC process was developed by JavaScript, and the visual interface was developed by HTML and CSS, and the model software is intuitive and clear, and it can be operated easily. The model software has the functions of kinetic parameter estimation and product prediction. Based on the experimental data from a small riser FCC unit,57 kinetic parameters for the model were solved by the model software. The analysis results for the parameters show good consistence with the reaction rules and characteristics of heavy oil catalytic cracking. In order to facilitate the industrial application of the lumped model, the unit factors are introduced to modify the lumped model. The relative error of model prediction is less than 5%. It is shown that the lumped reaction network is reasonable, the model is reliable, the numerical methods used in the lumped model software were reliable and the software can meet the calculation requirement of the model.