Crude oil electric desalting method and electric desalting device

Abstract

The invention discloses a crude oil first-stage electric desalting method and a crude oil electric desalting device, which reduce the rinsing water consumption. According to the crude oil first-stage electric desalting method, under the condition that no rinsing water is added or a small amount of rinsing water is added, crude oil to be desalted is mixed with a demulsifier, and then is injected into an electric desalting tank under appropriate temperature to achieve oil-water separation in the electric desalting tank; and the separated oil is filtered by a filter positioned inside or outside the electric desalting tank to remove solid salt substances in the separated oil to become first-stage purified crude oil, and the separated water is deposited in the electric desalting tank and then discharged. The solid salt substances in the crude oil do not need to be dissolved with the rinsing water due to the arrangement of the filter, so that no rinsing water or only a small amount of rinsing water is added, the consumption of the rinsing water is reduced and even saved, and the discharging amount of waste water is reduced. The invention also discloses a crude oil Nth-stage (N is larger than 2) electric desalting method and a crude oil second stage electric desalting method.

Description

technical field [0001] The invention relates to crude oil electric desalting technology, in particular to a crude oil electric desalting method and an electric desalting device. Background technique [0002] Generally, crude oil contains water and different types of salts. These salts exist in two forms, one is salt in a solid state, and the other is water-in-oil in water. Therefore, after the extracted crude oil enters the refinery, it must first be desalted and dehydrated. At present, the electric desalination method is mainly adopted. The principle is to mix the crude oil with a demulsifier and washing water. The function of the demulsifier is to destroy the water-in-oil and promote the settlement of water, while the function of the washing water is to remove the demulsifier in the crude oil. Dissolve body salts, and finally realize oil-water separation under the action of an electric field to achieve the purpose of desalination and dehydration. Such as figure 1 As sho...

AI Technical Summary

Problems solved by technology

The above-mentioned electric desalination method not only consumes a large amount of washing water, but also produces a large amount of sewage, which is not convenient for subsequent treatment and also increases operating costs.

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