蜡油加氢裂化装置生产工业白油的改造思路

REVAMPING OF GAS OIL HYDROCRACKING UNIT TO PRODUCE INDUSTRIAL WHITE OIL

鉴于目前柴油产品经济效益差的现状,从中海油惠州石化有限公司4.0 Mt/a蜡油加氢裂化装置柴油产品及其馏分性质着手,拟采用柴油产品的中间馏分生产经济效益更好的5号工业白油,因而使用SIMSCI PROⅡ软件对装置分馏系统进行全流程模拟,提出并实施了主分馏塔降压至0.1 MPa以下、提高柴油再沸返塔温度等优化措施,然而在现有设施基础上的优化调整无法将柴油初馏点提高至目标值。因此,以柴油产品中切割出220~360℃馏分生产5号工业白油为技术改造研究目标,提出增设蒸汽汽提塔和原柴油侧线汽提塔停用再沸器、改用蒸汽汽提的两个改造方案,两个方案均能将柴油初馏点提高至220℃,生产出合格的5号工业白油,从而将柴油转变为经济效益更好的白油产品,降低全厂柴汽比、提升全厂经济效益。

In view of the current situation of poor economic benefits of diesel products,starting from the study on the properties of diesel and its narrow fractions of 4.0 Mt/a gas oil hydrocracking unit of Huizhou Petrochemical Company,it was found that the middle fraction of the diesel product was suitable for the production of No.5 industrial white oil with better economic benefits.Therefore,the distillation system of the unit was simulated and evaluated,and the optimization measures were proposed and implemented,such as reducing the pressure of the main fractionation column to below 0.1 MPa and increasing the reboiler returning temperature of the diesel stripper.However,these measures based on existing facilities failed to raise the initial boiling point of diesel to the target value.In order to produce No.5 industrial white oil,the 220—360℃fraction of diesel products was cut off and used as a raw material.Two techniques:(ⅰ)adding a steam stripper to the diesel side-line stripper flow,(ⅱ)stopping the original reboiler of the diesel side-line stripper to use steam stripping,were proposed.The results showed that both proposals could increase the initial boiling point of diesel to 220℃and produce the qualified No.5 industrial white oil.It is proved that revamping measures are helpful to turn diesel into white oil product with better economic benefits and improve the economic benefits of the whole plant.