Simulation And Optimization Of 0.8Mt/a FCC Gasoline Hydrogenation Unit

In this study,a running hydrodesulfurization plant in a Chinese refinery was researched.The capacity of the unit is 0.8Mt/a.The Petro-SIM software of KBC was used in this simulation work.The operation data were collected from the plant,and the data acquisition time spanned six months.The reactor simulation process was a focus,so through the comparison of the simulation results and the actual data,the error was controlled in a reasonable range,that is,the error is within 4%.The important parameters of the reactor were obtained from the simulation results.These parameters determined the extent of reaction and were used to establish the reactor simulation model.The pre-hydrogenation section,the fractionation section,the dehydrogenation section,and the recycle hydrogen purification were also simulated.So all process simulation of the full set was established.Based on the simulation result,the effect of reaction temperature,hydrogen-oil ratio,space velocity and other operation conditions on product distribution,group compositon,RON and sulfur content was studied.The results show that the reactor temperature should be 260?-261?,which is 3-4?higher than that of now the device.The hydrogen-oil ratio is 260Nm³/m³,which increases 10 Nm³/m³ than that of the current operation of the device.The space velocity?LHSV?is 2.4h^-1-2.7h^-1.The operating conditions have a significant impact on the device.The optimized operating conditions can not only ensure the desulfurization effect,but also ensure the quality of gasoline in line with national standards.According to practical problems of the plant,some suggestion was proposed,such as,change space velocity,increase LCN yield,increase the hydrogen protection for pretreatment tank,and the preliminary separation of small molecule olefins.In addition,the arsenic removal device was increased to solve the problem of the rapid catalyst deactivation.