3.5Mt/a重油催化裂化装置加工渣油加氢尾油的影响及分析

The Influence of 3.5Mt/a RFCC Unit Processing RDS Tail Oil

大连石化3.5Mt/a重油催化裂化装置2008年8月开始加工RDS尾油。掺炼RDS尾油后,原料变重,轻组分含量下降;干气收率基本相当,液化气、柴油收率增加,汽油、油浆收率下降,轻油收率下降,总液收增加;虽然原料中硫含量增加,但产品中硫含量均下降,烟气、焦炭中硫含量上升,外送含硫污水中硫含量下降,产品中的硫主要集中在油浆中,大大降低了后续脱硫装置的负荷,有利于产品质量提升;加工RDS尾油有利于装置降低能耗,综合能耗下降1.76kg标油/t;由于原料中污染物含量以及产品中硫含量下降,从而减少了催化剂消耗,降低了后续精制工序的操作难度,使液碱与脱硫剂消耗大幅下降。如何降低催化原料中的硫含量和氮含量,并使原料中的硫、氮不以SO2、NOx的形式排放到大气,而是将其转移到产品中,以减少对大气的污染,是今后工作中的主要任务。

PetroChina Dalian Petrochemical Company＇s 3.5Mt/a RFCC unit began to process RDS tail oil in August 2008.After RDS tail oil was introduced,the feedstock became heavier and the contents of light components dropped.The yield of dry gas stayed about the same;the yields of LPG and diesel fuel increased, while those of gasoline,slurry oil and naphtha dropped.The yield of total liquids increased.Although the con- tent of sulfur in the feedstock increased,that in products all dropped.The contents of sulfur in flue gas and coke rose but the content of sulfur in sewage discharged out of the company dropped.Most sulfur in products is concentrated in slurry oil and this greatly reduced the load of desulfurizing units,which is instrumental to the improvement of the quality of products.Processing RDS tail oil can help units reduce energy consumption. The overall energy consumption of Dalian Petrochemical Company＇s RFCC unit dropped by 1.76kg of oil e- quivalent per ton of feedstock.As a result of the drop in the content of pollutants in the feedstock as well as the content of sulfur in products ,the consumption of catalysts dropped ,reducing the difficulty of operating subsequent refining processes and significantly reducing the consumption of liquid caustic soda and desulfuriz- ing agents.The main tasks for Dalian Petrochemical Company in the future will be reducing the contents of sulfur and nitrogen in catalytic feedstock and transferring sulfur and nitrogen in the feedstock into products instead of discharging them into the atmosphere in the forms of SO2 and NOx to mitigate air pollution