Abstract
Problem statement: The aim of this study is to obtain a model that can simulate the performance of an industrial fluid catalytic cracking unit in steady state. Approach: The reactions in the riser occur in a transported bed with the fluid and the solids in ideal plug flow. One of the main advantages of the model is that it does not include any partial differential equations. This facilitates the solution of the equations and makes the model particularly suitable for control studies. Results: To simulate the FCC riser, the four-lump model involved gas oil, gasoline, light gas and coke (to predict the Gas oil conversion and the product distribution) has been developed. Conclusion: Simulation studies are performed to investigate the effect of changing various process variables, such as temperature, catalyst circulation rate and gasoil feed rate. The calculated data of the product distribution were agreed well with the experimental results.
Highlights
The Fluid Catalytic Cracking (FCC) unit is one of the most important processes in the petroleum refining industry
In the first kinetic model (3-lump), proposed by Weekman (1968), reactants and products were lumped into three major groups: Gas oil, gasoline and light gas plus coke
Dupain et al (2006) simplified the 5lump model of Corella and Frances (1991) for the specific case of the catalytic cracking of aromatic gas oil, by reducing the reactions involved in the lumping scheme
Summary
The Fluid Catalytic Cracking (FCC) unit is one of the most important processes in the petroleum refining industry. With presence of the high efficiency feed injection system in modern FCC units cause all cracking in the riser occur during the short time (about 1-5 sec) Based on this fact, it is explainable that many of the models found in the literature (Arandes and de Lasa, 1992; Arbel et al, 1995; Han and Chung, 2001; Ali and Rohani, 1997; Bollas et al, 2007), describe the riser reactor, with one-dimensional mass, energy and chemical species balances, so in the Corresponding Author: Mehran Heydari, Department of Chemical Engineering, Amir Kabir University of Technology, P.O. Box 15875-4413, 424, Hafez Ave, Tehran, Iran Tel:+989121752593
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