Abstract: Most of the absorption-stabilization systems of FCCUs are troubled by serious C3+ components entrained in dry gas and high energy consumption, in this paper, analysis of process and operation is carried out to find out the causes, and based on integrating new techniques an optimized process and operation scheme is proposed, including desorption tower is equipped with a re-boiler at the middle and feeding full cold feed, adding a side cut line at the lower part of the stabilization column to draw out light gasoline for the replacement of stabilized gasoline as supplement absorbent, increase the operation temperature of condensed oil tank and decrease the operation temperature of absorption tower appropriately. Results of a case study applying said proposal showed that the volume fraction of entrained C3+ components in dry gas decreased by 42.09% and the energy consumption of the system reduced 17% as compared with prior to optimization.

Key words: catalytic cracking, absorption-stabilization system, optimization, energy saving, dry gas