Method and apparatus for high-efficient crude oil desalination / dehydration

A crude oil dehydration and desalination technology, which is applied in the field of petrochemical industry, can solve the problems of electric field collapse, transformer tripping, desalination/dehydration effect deterioration, etc., and achieve the elimination of stabilization effect, reduction of crude oil water content, desalination/dehydration rate and stable operation improvement Effect

Inactive Publication Date: 2014-04-30
GUANGZHOU BOXENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the electric field strength will promote the formation of water chains, causing the electric field to collapse, causing the transformer to trip, and deteriorating the desalination / dehydration effect

Method used

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  • Method and apparatus for high-efficient crude oil desalination / dehydration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Crude oil density is 846.6Kg / m 3 , with a salt content of 17.0 mgNaCl / l. The combination of filtration method and first-stage electric desalination is adopted. The filter medium layer is polyester fiber with oxidized surface layer, the thickness is 0.25m, and the initial pressure drop is 0.02MPa; the demulsifier model is EC2425A, and the dosage is 5μg / g; The washing water mixed with crude oil and demulsifier is salt-free industrial purified water, PH=7.9, and the dosage is 4% of the crude oil; the electric field form of the electric desalting tank is an alternating electric field, and the electric field strength in the strong field area is 850 V / cm, the electric field strength in the weak field region is 400 V / cm; the temperature of the oil-water emulsion is 110°C. The salt content of a stripped crude oil is 1.3 mgNaCl / L, and the water content is 0.05%.

Embodiment 2

[0034] Crude oil density is 883.2Kg / m 3 , with a salt content of 87.4 mgNaCl / L. The combination of filtration method and two-stage electric desalination is adopted. The filter medium layer is glass fiber paper with a thickness of 0.10m and an initial pressure drop of 0.04MPa; the demulsifier model is FC9303, and the dosage is 10μg / g; the washing water is salt-free industrial purified water, PH=6.7, the secondary water injection volume is 7% of the crude oil, and the secondary saline sewage is mixed with the crude oil and demulsifier before returning to the static mixer; the electric field form of the electric desalination tank is an AC-DC electric field, The electric field intensity of the first-stage electric desalination tank is 900V / cm, and that of the second-stage electric desalination tank is 1000V / cm; the temperature of the oil-water emulsion is 125°C. The salt content of the dide crude oil is 2.6 mgNaCl / L, and the water content is 0.18%.

Embodiment 3

[0036] Crude oil density is 933.6Kg / m 3 , with a salt content of 128.4 mgNaCl / L. The combination of filtration method and two-stage electric desalination is adopted. The filter medium layer is polyester fiber with oxidized surface layer, the thickness is 0.50m, and the initial pressure drop is 0.046MPa; the demulsifier model is EC2425A, and the dosage is 10μg / g; The desalination of this crude oil is quite difficult, and the secondary salty sewage is no longer reused. When mixing with this crude oil and demulsifier, industrial purified water without salt is directly used, its pH=8.5, and the dosage is 13% of the crude oil; The quality of the water used for mixing the primary water injection with crude oil and demulsifier is the same, and the dosage is 8% of the crude oil; the electric field form of the electric desalting tank is a pulse electric field, and the pulse electric field strength of the primary electric desalting tank is 2500V / cm, and the pulse frequency is 1000Hz , ...

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Abstract

The invention belongs to the technical field of petrochemical industry, and particularly relates to a method and an apparatus for high-efficient crude oil desalination / dehydration by a combined filtration-electric field coalescence method. The apparatus for high-efficient crude oil desalination / dehydration of the invention comprises a raw material conveying system, a mixing device, a dehydration filtration device, and an electrical desalting device which are connected in order. The method for high-efficient crude oil desalination / dehydration of the invention is realized by using the apparatus for high-efficient crude oil desalination / dehydration of the invention and through the steps of raw material preheating, mixing, preliminary demulsification, and electrical desalination / dehydration. The invention adopts a combined filtration-electric field coalescence method for crude oil desalination / dehydration, which can overcome respective disadvantages of performing desalination / dehydration process by a filtration method or an electric field coalescence method, decrease running severity of both the two methods, not only improves the adaptability of the crude oil desalination process, the desalination / dehydration rate, and the stable running rate, but also reaches the purposes of energy saving and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method and equipment for high-efficiency crude oil desalination / dehydration combined by filtration and electric field coalescence method. Background technique [0002] Crude oil inevitably contains a certain amount of salt and water, and contains trace amounts of heavy metals. The salts are mainly dissolved in the tiny water droplets contained in crude oil in the form of alkali metal and alkaline earth metal hydrochloride, and these water droplets are mostly suspended in the oil phase in the form of "water-in-oil" (W / O) emulsion , particle diameter of 10 ~ 20nm, with high stability. The salt contained in crude oil is the main cause of equipment corrosion and scaling, so the first process of crude oil processing is desalination / dehydration. [0003] At present, there are more than ten kinds of crude oil desalination / dehydration methods: mechanical me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
CPCC10G31/08
Inventor 肖天存黄瑜
Owner GUANGZHOU BOXENERGY TECH
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