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Crude oil pulsing electrical desalting technique

A pulsed electric and secondary electric desalination technology, which is applied in the direction of electricity use/magnetic dehydration/demulsification, etc., can solve the problems of poor desalination effect, no technical process and process conditions of crude oil electric desalination, and high power consumption, so as to save electric energy. Effect

Inactive Publication Date: 2007-09-19
CHINA PETROLEUM & CHEM CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding problems of this technology are: poor desalting effect on heavy crude oil; high oil content in sewage; high power consumption, easy short circuit and tripping of electric desalting device
[0005] Dehydration of oil-water emulsion, due to the low pulse field strength, the desalination effect is not ideal
Chinese patents CN1358824, CN96202788 and CN95219078 are all high-frequency pulse electric dehydration devices, which are suitable for the electric dehydration process of oil field crude oil, and do not involve the process and process conditions of crude oil electric desalination

Method used

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  • Crude oil pulsing electrical desalting technique
  • Crude oil pulsing electrical desalting technique

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Experimental program
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Effect test

Embodiment 1

[0025] In this embodiment, on the basis of the existing electric desalination tank and its auxiliary facilities, the full-impedance transformer and its control system of the conventional electric desalination are replaced by a pulse transformer and its control system. The pulse power supply consists of a pulse generation controller 2 and a full-impedance high-frequency explosion-proof transformer 5 , the pulse generation controller 2 is installed in the operating room, and the high-frequency explosion-proof transformer 5 is installed on the electric desalination tank 4 . The input 380V power frequency power supply 1 is rectified and inverted by the pulse generator controller to become the required pulse signal, and then transmitted to the high-frequency explosion-proof transformer placed on the electric desalination tank through the cable 3, after boosting to the voltage required by the electric desalination process, The high-voltage cable 6 is connected to the inner pole plate...

Embodiment 2

[0029] The production equipment and technological process that present embodiment adopts are the same as embodiment 1.

[0030] Its crude oil density is 878.2Kg / m 3 , the salt content is 98.5mgNaCl / l; the desalination temperature is 120°C; the demulsifier is oil-soluble, the model is EC2425A; the water injection is industrial purified water, PH=6.0.

[0031] The addition amount of primary desalination demulsifier is 5 μg / g, the water injection volume is 5%, the pulse electric field strength in the strong field area is 2000V / cm, the pulse frequency is 1000Hz, and the duty cycle is 30%; the secondary desalination water injection volume is 5%, The pulse electric field strength in the strong field area is 2000V / cm, the pulse frequency is 1000Hz, and the duty cycle is 30%.

[0032] Salt content after removal / mgNaCl·l -1

Embodiment 3

[0034] The production equipment and technological process that present embodiment adopts are the same as embodiment 1.

[0035] Its crude oil density is 878.2Kg / m 3 , the salt content is 98.5mgNaCl / l; the desalination temperature is 135°C; the demulsifier is oil-soluble, the model is EC2425A; the water injection is industrial purified water, PH=8.0.

[0036] Salt content after removal / mgNaCl·l -1

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Abstract

The invnetion discloses a impulse electric desalting and dewatering technology, after heating crude oil mixed with demulsifier and wash water entered into desalting pot with two grades, technical condition of the first grade of the electric desalting is: 3%-15% of water injection, pulse electric field strength is 800 v / cm-5000 v / cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 6%-50%; technical condition of the second grade of the electric desalting is: 3%-12% of water injection, pulse electric field strength is 1500 v / cm-5000 v / cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 0%-50%. After desalting and dewatering in this technical condition, salinity >=3.0 mg NaCl / L, water content >=0.3%, dewatering oilness >=100 mg / L of treated crude oil to deeply desalt. The technique is suit for electric desalting of light, middle and heavy crude oil with advantages of high efficiency, low cost and environmental protection, general desalting efficient is more than 95%, saving power about 60% comparing with ordinary electric desalting technique.

Description

technical field [0001] The invention belongs to the technical field of petrochemical electric desalting process, and mainly relates to a crude oil pulse electric desalting process. Suitable for electric desalting process from light to heavy crude oil. Background technique [0002] In the process of petroleum processing, the salt contained in crude oil is the main cause of corrosion and fouling of equipment. With the heavy and inferior quality of crude oil and the continuous improvement of crude oil processing depth, downstream devices have put forward higher requirements for crude oil electric desalination. How to achieve deep crude oil desalination by means of high efficiency and low consumption is the development of crude oil electric desalination technology. direction. [0003] Salts in crude oil mainly exist in the form of alkali metal and alkaline earth metal salts. Most of these salts are enriched in the water contained in crude oil in the form of inorganic salts, an...

Claims

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Application Information

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IPC IPC(8): C10G33/02
Inventor 任满年李彬刘可非董力军李中新叶久良梁晓斌齐文瑞杨萍陈灵文田英爱徐娟杜瑞华陈卫平王正李丛梅
Owner CHINA PETROLEUM & CHEM CORP
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