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The purpose of the catalytic cracking process fluid bed is conversion of heavy oil to light hydrocarbon at a lower cost and more reliable method. Some of the products include with the distillates, gasoline and light olefins. Efficient performance of catalytic cracking fluidized bed for the refinery economy is essential and important process in oil refineries. The efficiency of the FCC unit depends to a large number of parameters such as feed composition, residence time, temperature, the ratio of catalyst to feedstock oil, catalytic properties, the partial pressure of hydrocarbons and hydrodynamic riser.In this study fluidized bed catalytic cracking process modeling was performed and operating conditions as input to the program and the results obtained. The modeling of kinetic model was used four lumps, first order and changes in radius is ignored. The balance of energy, mass and momentum are written that yield can be calculated via the mass balance, velocity can be achieved through the momentum equation and temperature profiles during reactor can be obtained via energy balance. Products yield, profiles of temperature and velocity of the gas phase were obtained by using the proposed model. The results showed that feed efficiency is increased and products yields are reduced during reactor length. It was observed that during the process catalyst performance is decreased and also compare the results with experimental results indicate good agreement between the proposed model and industrial results that these results can be used to achieve high-precision products. The mean error is 3.3% for gasoline yield, 5.5% for coke yields and 2% for reactor temperature. |
