| As an important process in the secondary processing of oil refining industry, fluid catalytic cracking (FCC) is the main equipment to process crude oil deeply and to improve the yield of light oil and economic benefits. Therefore, it has the vital significance to research the process of fluid catalytic cracking further.Base on the refinery’s data, the software Aspen Plus is adopted to simulate and optimize the united process of main fractionate and absorption-stabilization system. And a reasonable evaluation on the different processes of absorption-stabilization system is also given in the paper.As a result, the quality of both gasoline and diesel can be controlled by adjusting the main fractionator overhead recycle and mid cycle heat extraction. For absorption stabilization system, increasing supplement absorbent flow can improve the absorption effect significantly; increasing the stability of tower reflux ratio and the number of theoretical plates can improve the quality of liquefied petroleum gas and gasoline; stabilization column overhead flow rate has a great influence on quality of liquefied petroleum gas; raising desorber feed temperature can reduce the load of desorber reboiler; reducing the reabsorption tower lean absorption oil temperature can improve the dry gas quality. The different processes of absorption-stabilization system are simulated. And the results are as followed:the system energy consumption of hot feed process is the highest; two-condensation process can reduce the system energy consumption effectively, reduce the flow rate of desorption gas and vapor-phase load of desorber. The simulation results have an important guiding significance for the design and operation of FCC separation system. |
