Optimization Of Operational Parameters Of Reaction- Regeneration System In FCC Unit

As the main process unit of liquefied petroleum gas, gasoline, diesel and other light oil, FCC unit holds an important position in today's society, which needs to upgrade fuel oil products and has serious environmental issues. The demand for high-quality gasoline and diesel is increasing, that means higher requirement for FCC. How to optimize the catalytic cracking unit reactor-regeneration system operating conditions, increase light oil yield, improve product quality, maximize economic efficiency, has become a hot research topic.This paper is based in 21 lumped kinetic model, explore the internal mechanism of the catalytic cracking of a fluidized bed reactor, and is designed to predict the distribution of products, optimize the operating parameters, and improve product liquid yield and economic benefits. For a petrochemical 650,000 tons/year catalytic cracking unit, using HYSYS simulation software for device simulation model and use of feed and product data to calibrate the model parameters, results in an error within the permissible range.Firstly, on general catalytic cracking, to products liquid received and economic for target function, respectively on reaction-regeneration system in the reaction temperature, and into material preheat temperature, and reaction pressure, and reaction time and back refining than, independent variable for single variable sensitivity analysis, investigation its on agent oil than, and conversion rate, and products distribution and products nature of effects, get each independent variable of best operation conditions.Secondly, the paper studies the cold catalytic cracking process regenerated catalyst circulation, the use of external agents take the heat regeneration technology, the regenerated catalyst temperature without burning effect limit and become independently adjustable, the successful resolution of the reaction temperature, feed preheat temperature, regeneration temperature and catalyst to oil ratio and other issues of mutual coupling parameters, in-depth study of the impact parameter essentially improved reactor reaction, and the reaction temperature and the catalyst to oil ratio sensitivity analysis. The study found that different from conventional catalytic cracking, when oil ratio changes, the optimum reaction temperature constant, and vice versa, that is, the reaction temperature and catalyst to oil ratio of the reaction is independent, can be optimized separately. Further, at the same time using the Optimizer Optimizer multivariate optimization, we found no return refining, should be using a larger oil ratio, the lower the reaction time, the reaction temperature is moderate operating conditions; the case back to the refining, should be large Back refining ratio, low oil ratio, and lower reaction temperatures, in order to improve the yield of diesel and liquid yield.Whether conventional catalytic cracking catalyst regeneration cycle or cold catalytic cracking process, after optimized, liquid yield and economic benefits are greatly improved, which has some significance for field operations.