Study On The Co-coking Law Of FCC Slurry And Vacuum Residue

The delayed coking process is one of the most important heavy oil lightweight technologies in the modern world.This process can deal with many heavy components,like vacuum residue,deoiled asphalt,coal tar and so on.FCC slurry is a low-valued product;I think it might be a feasible way to add the FCC slurry to vacuum residue for delayed coking for raising the economic efficiency.The product yield of delayed coking reaction is mainly influenced by operation conditions and raw material properties.In this paper,delayed coking experiments of various raw materials are carried out on an accurate evaluation device for heavy oil thermal processing in order to observe the experimental results of delay coking with vacuum residue which is blended into different types of FCC slurry.The reaction time ranges from 15 minutes to 150 minutes,and the reaction temperature ranges from 470℃ to 490℃.Mixing ratio of FCC slurry is 5%,10% and 15%.The experimental results show that the suitable operation temperature of the experiment is between 480℃ and 490℃ and the suitable operation time of the experiment is 90 minutes or more.After mixing the FCC slurry,the products yield of delay coking is changed,the yield of gas,coke and the wax oil is increased and the yield of gasoline.diesel oil is decreased.The most suitable mixing ratio is depended by the device operating conditions and the type of the mixed slurry.Based on the results of the small test experiment,this paper carried out a delayed coking experiment on the pilot experiment for further analysis of the experimental products.Establishing a Delayed Coking Five-lumped Dynamic Model to fit coking product yield and heavy oil conversion curve.This model can predict the each product yield of delayed coking.