Method for dehydrating highly emulsified sump oil and device adopted by method

Abstract

The invention discloses a method for dehydrating highly emulsified sump oil. The method comprises the following steps: injecting highly emulsified sump oil and a demulsifier into a jet-static mixer for full contact and mixing to obtain a preliminarily separated oil-water mixture; injecting the preliminarily separated oil-water mixture into an efficient separator for gravity settling separation orcoalescence separation to obtain sump oil and wastewater of which the water content meets the requirements. The invention further discloses a device adopted by the method. The invention aims to solvethe problems that large refinery sump oil yields and high sump oil moisture contents cause huge dirty oil storage pressure on a refinery plant; the dirty oil is difficult to recycle; and the like. Onthe basis of the demulsification and coalescence sedimentation principle, a complete set of separation device integrating the jet-static mixer and the efficient separator is developed, efficient removal of water in sump oil is achieved, the separation device is simplified while it is guaranteed that a final product is qualified, and resource utilization of water-containing sump oil is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for dehydrating highly emulsified waste oil and a device used in the method. Background technique [0002] Sludge oil will be produced in the normal production and abnormal production process of the refinery, such as the start-up and shutdown of equipment, equipment maintenance, machine pump switching, coking cold coke water tank cutting oil, etc. Due to the many parts of dirty oil, the components are also particularly complex: there are lighter gasoline components and heavier residual oil components. In addition, dirty oil has the characteristics of colloid, high asphaltene, strong emulsifying ability, high impurity content, and serious aging degree. Impurities in dirty oil come from drilling mud, fracturing fluid and sewage treatment agents, flocculants, coagulants, scale inhibitors, corrosion inhibitors, bactericides, caustic soda, etc. The reco...

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Problems solved by technology

The gravity sedimentation method occupies a large area, takes a long time to process, and has poor separation effect on the emulsified water-containing sewage oil; the membrane separation method has low energy consumption, convenient operation, and compact structure, but its stability and heat resistance are limited, and its cost is high. Uneconomical; the filtration method has high power consumption, is easy to block, and the separation effect is general; the flotation method has the advantages of large device processing capacity, less sludge generation and high separation efficiency, but it has long residence time and troublesome device manufacturing and maintenance. Disadvantages such as high energy consumption; ultrasonic separation method has the disadvantages of high energy consumption and limited actual operation effect; cyclone separation method has the advantages of simple structure, convenient operation, easy maintenance, etc. The difference is not big, so the effect of cyclone separation is actually limited; the one-time investment of chemical demulsification method is small, the process equipment is simple, the power consumption and comprehensive treatment cost are low, but the adaptability to raw materials is poor and the effect is limited

Electrocoagulation has the advantages of simple operation and fast separation speed, but high energy consumption and high operating costs

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