摘要
某炼化公司新建50万t/a催化裂化装置加工原料大庆油品质较好、装置油浆正常外甩量小、回炼混合C4比例高达70%、配套气体分馏装置设计规模为45万t/a,按常规催化裂化装置进行设计,将面临反应-再生系统热量不平衡,需要外补燃料油、气体分馏装置低温热源缺口较大等问题。为此,本设计采用了产品油浆全部回炼方案,实现了反应-再生系统热量平衡,提高了装置操作灵活性。同时,设计取消了回炼油系统、采用原料油进分馏塔底直接换热、取消部分低温位物流间换热,将更多的热量直接传递给热媒水的设计方案,实现了简化装置操作流程、降低设备投资、提高装置可靠性的目的,为装置安全长周期运行创造了条件。
The new 500kt/a FCC unit at a refining and petrochemical company takes the high quality Daqing Crude as the feedstock.The mass flow of slurry oil product is little,the recycling ratio of mixed C_4 hydrocarbon is as high as 70%,and the following gas separation unit has a design capacity of 450,000 tons per year.If conventional design scheme is adopted,some big problems will emerged,such as the heat imbalance between reactor and regenerator and the big gap in low temperature heat for the gas separation unit.Therefore,this unit adopts the scheme of recycling all the slurry product,so as to achieve the balance between reactor and regenerator and improve the operation flexibility.At the same time,the recycle oil system is removed,the oil feedstock is pumped to the bottom of the main column for direct heat exchange,and some of the heat exchangers between low-temperature streams are eliminated,so as to simplify the process flow,reduce the equipment investment and improve the reliability of the unit,thus creating favorable conditions for the long-cycle safe operation of the unit.
出处
《石油化工设计》
CAS
2016年第1期17-19,1-2,共3页
Petrochemical Design
