大型催化裂化装置系统设计压力分析与探讨

催化裂化装置系统压力提高受设备制造、装置规模及再生形式等影响,同时又会影响产物分布、能耗及机械设备运行等。因此,大型催化裂化装置系统压力设计需综合考虑加工规模、能耗、投资、设备制造、产物分布等多方面因素,进行经济核算和评估,得出最佳设计方案。经分析,在选择高效顺流快速床富氧两段再生形式的情况下,大、中型装置不受设备制造能力的限制,再生压力可设计为0.42~0.56 MPa;特大型装置再生压力可调整为0.28~0.42 MPa,以适应设备制造限制。

STUDY OF DESIGN PRESSURE OF LARGE-SCALE FCCU

In order to enlarge the capacity and to reduce energy consumption of the fluidization catalytic cracking unit (FCCU), increasing the pressure of FCCU is a trend. However, the enhancement of the FCCU pressure is influenced by equipment manufacturing, capacity, regeneration mode and other factors. Meanwhile, the changes of pressure also affect the product distribution, energy consumption and the operation of mechanical equipment. So，the design of FCCU pressure should consider the processing scale, energy consumption, investment, equipment manufacturing, product slate, and conduct economic accounting and evaluation to get the optimum design proposal. In the selection of higher performance, downstream, fast bed-turbulent, oxygen-enriched regeneration mode, large and medium-sized FCCU are not constrained by equipment manufacturing, the regeneration pressure can be designed as 0.42-0.56 MPa; oversize FCCU is restricted by the manufacture of mechanical equipment, the pressure can be adjusted to 0.28-0.42 MPa.