无沉降器催化裂化装置的必要性和可行性分析

Analysis of necessity and feasibility of fluidized catalytic cracking unit without a disengager

目前的分子筛催化裂化工业装置基本上是沿用微球合成硅铝催化裂化工艺的装备,保留再生器和反应器,增加提升管。结果油气的反应过程转移至提升管反应器内,原来的反应器蜕变为沉降器。随着催化裂化工艺技术的改进,这些装备的不适应性逐渐凸现,有些甚至形成了工艺运行的瓶颈,如沉降器中大空间的存在造成了油气的二次裂化反应和油气结焦等问题,尤其是对于重油催化裂化工艺。在叙述沉降器的演变,油气的二次裂化反应,停留时间,结焦等问题的基础上,分析了取消沉降器的必要性,同时提出几种无沉降器催化裂化工艺装置方案,讨论了技术上的可行性,以期能从装备上提高催化裂化工艺技术的水平。

The fluid catalytic cracking（FCC） equipment remains yet unimproved when the amorphous alumina catalysts are replaced by zeolite catalysts, the regenerator and reactor are still kept, and the riser reactor is added, which makes the original reactor transformed to be the disengager, because the cracking reaction of oil gas happens inside the riser reactor. With the advance of the FCC technology, some of the equipment are unadapted for the operation of fluid catalytic cracking unit perfectly and efficiently. The original reactor contains a large volume space, which results in over cracking of oil gas and coke deposition, especially for the RFCC process. Based on the evolution of the reactor function, the non disengager fluid catalytic cracking （NODFCC） unit is proposed according to the problems in the secondary cracking of oil gas, resident time and coking. The reasonableness and feasibility of the NODFCC device are to be explored. The result is helpful to the development of the new FCC technology.