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

A crude oil dehydration and desalination technology, applied in the field of petrochemical industry, can solve problems such as electric field collapse, transformer tripping, desalination/dehydration effect deterioration, etc., to eliminate stabilization, reduce crude oil water content, desalination/dehydration rate and stable operation improvement Effect

Inactive Publication Date: 2011-10-26
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

Method used

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

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] The density of crude oil is 846.6Kg / m 3 , The salt content is 17.0 mgNaCl / l. Using a combination of filtration method and first-level electrical desalination, the filter medium layer is an oxidized polyester fiber on the surface, the thickness is 0.25m, and the initial pressure drop is 0.02MPa; the demulsifier model is EC2425A, and the dosage is 5μg / g; and The washing water mixed with crude oil and demulsifier is salt-free industrial purified water, PH=7.9, and the amount is 4% of the crude oil; the electric field of the electric desalination tank is an AC electric field, and the electric field intensity in the strong field area is 850 V / cm, the electric field strength in the weak field area is 400 V / cm; the temperature of the oil-water emulsion is 110°C. The salt content of the crude oil is 1.3 mgNaCl / L and the water content is 0.05%.

Example Embodiment

[0034] Example 2

[0035] The density of crude oil is 883.2Kg / m 3 , The salt content is 87.4 mgNaCl / L. Using a combination of filtration and two-stage electrical desalination, the filter medium layer is glass fiber paper, the thickness is 0.10m, and the initial pressure drop is 0.04MPa; the demulsifier model is FC9303, and the dosage is 10μg / g; the washing water is salt-free The industrial purified water, PH=6.7, the secondary water injection volume is 7% of the crude oil, the secondary salty sewage is mixed with the crude oil and the demulsifier before returning to the static mixer; the electric field of the electric desalination tank is an AC-DC electric field, The electric field intensity of the primary electric desalination tank is 900V / cm, the electric field strength of the secondary electric desalination tank is 1000V / cm; the temperature of the oil-water emulsion is 125°C. The salt content of the secondary crude oil is 2.6mgNaCl / L, and the water content is 0.18%.

Example Embodiment

[0036] Example 3

[0037] The density of crude oil is 933.6Kg / m 3 , The salt content is 128.4 mgNaCl / L. Using a combination of filtration and secondary electrical desalination, the filter medium layer is an oxidized polyester fiber on the surface, with a thickness of 0.50m, and an initial pressure drop of 0.046MPa; the demulsifier model is EC2425A, and the dosage is 10μg / g; The crude oil is difficult to desalinate. The secondary salty wastewater is no longer reused. When mixed with the crude oil and demulsifier, salt-free industrial purified water is used directly, its PH=8.5, and the amount is 13% of the crude oil; The quality of the water used when the first-level water injection is mixed with crude oil and demulsifier is the same, and the amount is 8% of the crude oil; the electric field form of the electric desalination tank is a pulse electric field, the pulse electric field strength of the first-stage electric desalination 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

[0001] technical field [0002] 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 [0003] 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. [0004] At present, there are more than ten kinds of crude oil desalination / dehydration methods: me...

Claims

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Application Information

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IPC IPC(8): C10G53/02
CPCC10G31/08
Inventor 肖天存黄瑜
Owner GUANGZHOU BOXENERGY TECH
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