吸收稳定系统工艺流程及操作优化

针对目前催化裂化装置吸收稳定系统普遍存在的燃料干气中C3+液化气组分携带严重即"干气不干"和能耗较高的问题，从流程结构和操作参数两方面进行分析，找出造成干气不干和能耗高的主要原因，并以此为基础集成现有先进研究成果针对性地提出一个优化的吸收稳定系统工艺流程和操作方案：解吸塔设置中间再沸器并采用全冷进料；稳定塔新增下部侧线，抽出轻汽油代替稳定汽油作吸收塔补充吸收剂；适当提高凝缩油罐操作温度和降低吸收塔操作温度。与现有流程和操作相比，提出的优化流程及操作方案可使干气中C3+液化气组分体积分数降低42.09%、系统能耗降低17%。

OPTIMIZATION OF PROCESS AND OPERATION IN ABSORPTION-STABILIZATION SYSTEM

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.