Study On Lumped Kinetic Model Of Karamay Atmospheric Residue Slurry-bed Hydrocracking

With the increasing severity of the properties of crude oil in the world,the residue slurry-bed hydrocracking receives broad attention as an effective process to make the heavy oil lighter.The establishment of a kinetic model which can accurately describe the residue slurry-bed hydrocracking process and predict the distribution of the product is of great significance to direct the reactor design and the optimization of operation conditions.The hydrocracking of Karamay atmospheric residue is studied in the autoclave under different conditions in order to simulate the residue slurry-bed hydrocracking process.Based on the experimental data,the applicability of the 6-lump kinetic model is studied.A 9-lump kinetic model is developed on the basis of the reaction rules and the applicability result.The effects of different reaction conditions on the slurry-bed hydrocracking of Karamay atmospheric residue are different.The effect of temperature is greater than the reaction time and the initial pressure.Higher temperature,lower pressure and longer reaction time are conducive to the slurry-bed hydrocracking of Karamay atmospheric residue.The parameters of the 6-lump kinetic model of Gudao residue are not suitable for the slurry-bed hydrocracking of Karamay atmospheric residue.Parameters are re-estimated by MATLAB programming based on the experimental data,using the Runge-Kutta method and the least squares method,and then the 6-lump kinetic model of Karamay atmospheric residue is established.The application of the 6-lump kinetic model of Karamay atmospheric residue is better,but the relative errors of resin and asphaltene are large.Based on study,the gas+distillate lump is divided and the 9-lump kinetic model is developed,which includes gas,gasoline,diesel fuel,gas oil,saturate,aromatic,resin,asphaltene and coke.According to the reaction rules,the reaction network is constructed and the kenitic equation is derived.After solving the kinetic parameters,all the errors are less than 10%,most of the errors are within5%.The model is verified through the experimental data under the condition of 435℃ and7 MPa.The prediction relative error of each product is within 10%,the relative error of light oil is less than 5%.The 9-lump kinetic model is applied to the slurry-bed hydrocracking of Karamay atmospheric residue and of high degree of accuracy,which can provide some guidance to the development of the slurry-bed hydrocracking.