关键词: 炼油厂清罐污油, 机械清洗, 预处理, 卧式螺旋离心机, 轻相离心机, 重相离心机, 效益分析

Abstract:

The cleaning of crude oil tank mainly adopts the method of mechanical cleaning. A refinery has a total of 12 crude oil tanks, and the tank cleaning waste oil by mechanical cleaning is about 6,000 TPY. The iron mass fraction of the waste oil is as high as 5,692 μg/g, with high impurity content and unstable properties, making it difficult to directly utilize. The refinery uses SOTU(slop oil treatment unit) waste oil treatment technology to purify the tank cleaning waste oil, effectively separating oil, water, and solid residues from the waste oil. After separation, the water mass fraction of the purified oil is 1.6%, and the iron mass fraction is 359.8 μg/g, which meets the requirements of the downstream unit for recycling; the oil mass concentration of sewage is 100.88 mg/L, which can be directly sent to the sewage treatment unit; the water mass fraction of solid residues is 25.7%, which can be entrusted to hazardous waste recovery department. Using SOTU technology to purify the tank cleaning waste oil can effectively improve its the utilization value and further realize the reduction of hazardous waste. The recovery benefit of one ton waste oil can be 3,550 yuan, which has good economic benefits and application prospects.

Key words: refinery tank cleaning waste oil, mechanical cleaning, pretreatment, horizontal screw centrifuge, light phase centrifuge, heavy phase centrifuge, benefit analysis