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Integrated treatment method and device for crude oil electric desalting device oil-containing cutting water

A comprehensive treatment and electric desalination technology, applied in centrifugal separation of water/sewage treatment, grease/oily substance/float removal device, separation method, etc., can solve the problems of inconvenient operation, complex structure, large investment, etc. The effect of convenience, simple device structure and low energy consumption

Active Publication Date: 2008-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention is to solve the problems of poor oil-water separation effect, inability to effectively remove dissolved oil, emulsified oil and dispersed oil in sewage, and complex process, as well as the existing treatment device with complex structure, large investment, inconvenient operation and poor adaptability and the problem of large area

Method used

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  • Integrated treatment method and device for crude oil electric desalting device oil-containing cutting water
  • Integrated treatment method and device for crude oil electric desalting device oil-containing cutting water
  • Integrated treatment method and device for crude oil electric desalting device oil-containing cutting water

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Referring to Figure 1, after the electric desalination cut water is cooled to below 100°C by the heat exchanger 1, it enters the sewage cyclone degreaser 4 through the filter 2 and the mixer 3, and is centrifugally separated by the swirl tube in the cyclone 4 , the oily sewage is separated into watery sewage oil and saline sewage, the saline sewage is directly discharged outside, and the watery sewage oil overflows into the intermediate demulsification tank 5 . The intermediate demulsification tank 5 is equipped with multi-layer sloping plates or structured packing to mechanically demulsify the emulsified sewage oil. The intermediate demulsification tank 5 should also have a demulsifier injection port. Aids in demulsification. After the water-containing sewage oil stays in the intermediate demulsification tank for 10 to 60 minutes, it is boosted by the frequency conversion speed-regulating pump 6 and sent to the sewage oil cyclone dehydrator 7 for cyclone dehydration, a...

Embodiment 2

[0027] Referring to Figure 2, when the electric desalination cutting water has a high oil concentration, a two-stage cyclone oil removal process is adopted. After the electric desalination cutting water is cooled to below 100°C by the heat exchanger 1, it enters the first-stage sewage cyclone degreaser 4 through the filter 2 and the mixer 3. Under the centrifugal separation of the swirl tube in the cyclone, the oily sewage Separation into water-containing sewage oil and low-oil-containing saline sewage, water-containing sewage oil enters the intermediate demulsification tank 5, low-oil-containing saline sewage directly enters the secondary sewage cyclone degreaser 13 to continue oil-water separation, and is separated into water-containing sewage oil and Saline sewage, the saline sewage is directly discharged outside, and the oily sewage overflows to the intermediate demulsification tank 5 . The intermediate demulsification tank 5 is equipped with multi-layer sloping plates or ...

Embodiment 3

[0029] Referring to Figure 3, the electric desalination cut water enters the sewage cyclone degreaser 4 through the filter 2 and the mixer 3, and under the centrifugal separation of the swirl tube in the cyclone, the oily sewage is separated into watery sewage oil and low oil content. Saline sewage, water-containing sewage oil enters the intermediate demulsification tank 5, and low-oil-contained saline sewage enters the heat exchanger 1 to cool down to below 100°C before being discharged. The oily sewage overflowed from the cyclone degreaser 4 overflows to the intermediate demulsification tank 5 through the overflow outlet. The intermediate demulsification tank 5 is equipped with multi-layer inclined plates or structured packing to mechanically demulsify the emulsified waste oil. The intermediate demulsification tank 5 should also have a demulsifier injection port. When the emulsification of the water-containing sewage oil is serious, inject a chemical demulsifier Aids in demu...

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Abstract

The invention relates to a comprehensive process method and a process device of oiliness water draining of crude electric desalter, desalter waste water exhausted from a crude electric desalter is separated into hydrous waste oil and saliferous waste water by utilizing a high efficiency swirl oil-removal technology; the hydrous waste oil is sent to a waste oil dehydration device through pump pressurization after being demulsification-processed by an oil and water coalescer; qualified waste oil is sent to waste oil tank areas, a coking unit or is injected to a raw material oil tube line for recycling after dehydration. The oil content of the exhausted waste water of the electric desalter is reduced from thousands of ppm or even hundreds of thousands of ppm to less than 100 ppm by the device, meanwhile, the water content of the recycled waste oil is reduced to less than 1 percent, thereby waste water drainage standard is ensured and recycling on site of the waste oil is achieved. The device has the advantages that the oil removal effect of the waste water is good, the water content of recycled oil of the device is low, separating property is stable, applicability is good, operation range is wide, structure is compact and operation expense is low, etc. The invention can replace conventional oil removing and dehydration technologies of gravity settling and oil separation tank, etc., and can be applied to and promoted in the industries of petroleum and chemical engineering, etc.

Description

technical field [0001] The invention relates to a comprehensive treatment method for oily cut water of an electric desalination device in an oil refinery and a device used for implementing the method, belonging to the technical field of sewage and dirty oil treatment, and can be widely used in the field of petroleum refining. Background technique [0002] As most of the domestic oilfields have entered the final stage of secondary recovery and the stage of tertiary recovery, the emulsification and heavy quality of crude oil are becoming more and more serious. On the one hand, with the gradual application of tertiary oil recovery technology, the produced fluid is mostly an oil-in-water emulsion or a complex emulsion in which oil-in-water and water-in-oil alternate. The addition of a large number of polymer injection materials and chemical additives in the oil production process greatly increases the difficulty of crude oil desalination and dehydration; The continuous increase...

Claims

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Application Information

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IPC IPC(8): C02F1/40C02F1/38C10G32/00
Inventor 王振波金有海刘仁桓王建军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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