操作苛刻度对RFCC沉降器内油气重组分的影响

在提升管催化裂化中试装置上,考察了操作苛刻度对重油催化裂化(RFCC)装置沉降器中油气重组分,特别是大于550℃的馏分以及油浆中胶质、沥青质的影响,并结合操作苛刻度对产品分布的影响规律,建立了操作苛刻度函数。结果表明,随着操作苛刻度的提高,油浆中的馏分呈现出中间馏分增加,两端馏分降低的变化趋势,并且油浆中大于550℃馏分的含量明显减少,油浆中的胶质、沥青质含量减少。随着操作苛刻度的提高,在一定范围内轻质油收率基本不变,但是达到一定反应程度后,轻质油产率明显降低。建立的操作苛刻度函数为合理控制操作条件,保证目的产物收率的同时降低了油气中重组分的含量,从而为防止沉降器结焦提供了操作依据。

Influence of operating severity on the heavy components of oil vapor in RFCC disengager

The influence of operating severity on the heavy components of oil vapor, especially the distillate above 550 ℃, resin and asphaltene in the oil slurry, were investigated in a technical scale riser FCC pilot plant. A correlation between the operation severity and the distribution of heavy components and products was established. The results show that with the increase of operation severity, the content of the distillate heavier than 550 ℃ and the resin and asphaltene in the oil slurry are decreased obviously. Up to a certain limit, the yield of light oil changes little with the increase of the operation severity; however, it may decrease rapidly when the operation severity exceeds this limit. The operation severity correlation obtained in this work may provide proper guidance for controlling the operating condition to obtain a desirable product distribution and preventing RFCC disengager from coke formation by decreasing the content of heavy compounds in the oil vapor.