催化裂化分离与轻烃回收一体化流程模拟

Aspen Plus simulation on integrated processes of FCCU fractionation and light hydrocarbon recovery

回收催化裂化装置生产的乙烷、乙烯、丙烷、丙烯等轻烃可以使轻烃资源得到充分利用,在油品向化工转型的炼化一体化趋势之下具有重要意义。催化裂化分离与轻烃回收一体化流程整合现有工艺中的分馏、吸收稳定、双脱、气体分离和碳二回收流程,简化现有分离流程,减少全流程中设备的数量,降低物料在系统中的循环量,从而降低能耗和投资。文中利用Aspen Plus对该一体化工艺中部分关键流程设置进行模拟研究,模拟结果表明:选择前脱丙烷流程,选用顶循环回流作为甲烷氢再吸收塔的再吸收剂,以及富气压缩机设置三级压缩可以有效降低能耗指标、优化催化裂化分离与轻烃回收一体化流程。

Recovering the light hydrocarbons,such as ethane,ethylene,propane,propylene,etc.,from fluidized catalytic cracking units(FCCU) can significantly enhance the utilization of light hydrocarbon resources in refineries,which is essential to a refining/petrochemical integration scope.An integrated process of FCCU fractionation and light hydrocarbon recovery reconfigures current FCCU sections and subsequent gas treatment and separation steps,including reactor effluent fractionation,gas concentration,gas treatment,gas separation and C_(2) recovery.The proposed integration simplifies the current process,decreases the number of pieces of equipment,and reduces the material recirculation in the system,thus saving energy consumption and capital investment.Aspen Plus simulation results show that adopting depropanizer-deethanizer configuration,selecting the top cycle oil as the absorbent for methane/hydrogen product and employing three-stage wet gas compression can effectively save the energy consumption and optimize the process.