Treatment method and treatment system capable of realizing zero-emission purification of high-viscosity polymer-containing oil silt

Abstract

The invention relates to a treatment method and a treatment system for zero-emission purification of high-viscosity polymer-containing oil silt. The treatment method comprises the following implementation steps that: heating and overflowing are conducted in a pretreatment tank; water and chemicals are added into primary and secondary impurity removal machines to remove impurities; heating, homogenizing and overflowing are conducted in a heating homogenizing tank; a slurry pump is connected in series with a first-stage cavitation oil removal separation tank, a second-stage cavitation oil removal separation tank and a third-stage cavitation oil removal separation tank to treat the oil silt; a material from an upper outlet of a fine sand cyclone separator supplies liquid to centrifuges through a centrifugal machine liquid supply buffer tank, and a lower outlet discharges clean sand through a clean sand dehydration device; a primary fine mud treatment tank is used for receiving and treating oil water overflowing around; the effluent of the first-stage centrifuge and the effluent of the second-stage centrifuge enter a second-stage fine mud treatment tank to be treated; secondary centrifugal treatment is conducted on the fine mud through a mud stirring tank, and then clean mud is discharged; an aeration system and an oil scraping machine are mounted in an oil-water separation tank; awater pump is connected with a sewage treatment tank to form closed circulation through a heating furnace, and oil is output; and a building material cured product is prepared from clean silt. According to the invention, zero-emission purification treatment is completely achieved, and the problem of secondary pollution caused by purification treatment of the high-viscosity polymer-containing oilsilt is solved.

Description

technical field [0001] The invention relates to a purification treatment method and system, in particular to a zero-emission purification treatment method and treatment system for high-viscosity polymer-containing oil sludge sand. Background technique [0002] At present, a large number of high-viscosity polymer-containing oil sludge sands are produced in various links of crude oil development, production, refining, and transportation in old oilfields at home and abroad. The oil content of this oil sludge sand after purification treatment is higher than that of ordinary oil sludge sand purification treatment. 3-5 times, because this unqualified net mud sand contains polycyclic aromatic hydrocarbons, casual discharge will cause serious environmental pollution, and the harmful gas produced by incineration is several times higher than that of ordinary oil mud sand. This problem is the purification of oil mud sand There are still no effective solutions to the problems left over ...

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Problems solved by technology

[0006] (3) Use physical thermochemical water washing method to purify this kind of oil sludge sand. By adding a limited proportion of hot water, the oil sludge sand slurry cannot reach the optimum working temperature of 80°C for dissolving aged polymers, and the oil sludge sand is sorted and homogenized. When the quality is high, the temperature of more than 10°C will be lost, which is not conducive to the purification treatment of high-viscosity polymer-containing oil sludge sand

[0008] (5) When using the physical thermochemical water washing method, since high-viscosity oil and polymer have a certain viscosity, they have the ability to hold fine mud, and at the same time, the specific gravity is relatively close to water, so there will be oily polymer mixed into the centrifugal separation The clean mud and sand produced by the solidified material can only be used for pollutant discharge treatment, which causes environmental pollution and is not conducive to the recycling of resources.

[0009] (6) When using the physical thermochemical water washing method, the concentration of polymers in the water will continue to increase with the increase in the number of repeated use of hot water. When the concentration of polymers in the water reaches a certain value, the floating capacity of oil will be reduced, and the mud and sand will be difficult to get down. sink, so the polymer-containing water must be replaced, which causes secondary pollution

[0010] (7) All water washing methods to treat oil sludge sands have the phenomenon of centrifuge effluent and residue discharge after sewage settling

[0011] (8) When using physical thermochemical water washing method to treat high-viscosity polymer-containing oily sand, when the oil content of the centrifuge inlet material exceeds a certain value or the particle size of the material is very different, the oil content of the net sand separated by the centrifuge will be high. It is less than 2% of the building material conditions stipulated by the national standard, which makes it impossible to use these mud and sand as raw materials for building materials

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