Crude oil processing unit containing electro-desalted sewage oil remover and method of crude oil processing unit

Abstract

The invention relates to a crude oil processing unit containing an electro-desalted sewage oil remover, and a method of the crude oil processing unit. The crude oil processing unit includes an electrical desalter and a primary tower, wherein the electrical desalter is provided with a crude oil inlet, an oil outlet and a water drain outlet; the primary tower is provided with an oil phase inlet; and the oil outlet of the electrical desalter is communicated with the oil phase inlet of the primary tower. The crude oil processing unit is characterized in that the electrical desalter is further connected with the primary tower through a centrifugal separation unit so as to separate water and oil in electro-desalted sewage; and the centrifugal separation unit includes an inlet, an oil phase outlet and a water phase outlet, wherein the inlet of the centrifugal separation unit is connected with the water drain outlet of the electrical desalter, and the oil phase outlet of the centrifugal separation unit is communicated with the oil phase inlet of the primary tower. The crude oil processing unit and the method thereof overcome the defects that the present electro-desalted sewage oil removing method and equipment are complicated to operate, have poor effects, good separation effect and high separation speed, are convenient to operate and suitable for long-period operation, realize on-site oil removal of the electro-desalted sewage and recycle of the dirty oil, and have high applicability and high impact resistance.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and relates to a new method and device for degreasing electric desalination sewage. Specifically, the invention relates to a method for degreasing electric desalination sewage by utilizing centrifugal separation equipment. The invention also relates to an apparatus for use in the method. Background technique [0002] Crude oil contains salts and impurities, which will adversely affect the production and processing of crude oil and the smooth operation and maintenance of equipment. Therefore, desalination must be carried out in refining. In recent years, the recoverable oil has developed in the direction of heavier and inferior quality, which has adversely affected the stable operation of the electric desalination device, making it difficult for the electric desalination sewage to reach the corresponding oil content index. Electric desalination wastewater has become one of the main s...

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Problems solved by technology

Luoyang Petrochemical adopts a sewage pre-oil removal facility that combines oil separation and coarse-graining, which can remove most of the floating oil in the electric desalination sewage, and the recovered waste oil is reinjected into the inlet of the electric desalination device, realizing a virtuous cycle and achieving a more significant potential tap For synergistic purposes, however, the separated slop oil has a high water content (greater than 10%)

Changling Branch cooperated with China University of Petroleum (East China) to use liquid-liquid cyclone separation technology in the electric desalination device to reduce the oil concentration in the cut water of the electric desalination device, but the biggest problem of this technology is: the separated dirty oil The water content is as high as 80-90%. In addition, it is difficult to ensure the separation effect when the oil content in the incoming water is high (the oil content is greater than 5%)

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