Ultrasonic control method for electric desalination

Abstract

The present invention relates to the technical field of electric desalination and dehydration of crude oil, and specifically relates to an ultrasonic control method for electric desalination, specifically: the control unit adjusts the output power of the ultrasonic wave according to the average current of the electric desalination tank, specifically, P=a-bI, Among them, P is the ultrasonic output power, I is the average current of the electric desalination tank, a is an adjustable constant, and b is an adjustable coefficient. The parameters a and b are based on the upper and lower end values ​​of the ultrasonic output power and the corresponding average current of the electric desalination tank. Calculate the upper and lower end values ​​of the current. The invention can accurately control the output power of the ultrasonic wave used for electric desalination, and adapt to the change of the properties of crude oil and the change of the salt and water content of the crude oil.

Description

technical field [0001] The invention relates to the technical field of electric desalination and dehydration of crude oil, in particular to an ultrasonic control method for electric desalination. Background technique [0002] Electric desalting is the first pretreatment process for crude oil entering the refinery from the oil field. The electric desalting process requires water injection to remove the water-soluble inorganic salts contained in the crude oil, mainly to remove NaCl salts. In the process of electric desalination, the crude oil mixed with water is desorbed from water and water-soluble inorganic salts under the action of high-voltage electric field. In production, ultrasonic waves are used to prevent sludge deposition in electric desalination tanks, and ultrasonic waves are used to break the emulsion of crude oil after water injection. Ultrasonic waves have been gradually applied to the electric desalination industry. [0003] For the oil-water emulsion formed a...

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Problems solved by technology

[0003] For the oil-water emulsion formed after water injection in the electric desalination process, excessive ultrasonic intensity will easily lead to aggravated emulsification, difficulty in desalination and dehydration, affecting the effect of electric desalination, and also causing deterioration of the water quality of electric desalination drainage, resulting in oily and COD values ​​in electric desalination drainage Too high; for the oil-water emulsion formed after water injection in the electric desalination process, the ultrasonic intensity is too small, which will easily lead to insufficient ultrasonic effect, resulting in poor effect of preventing sludge deposition in the electric desalination tank, or insufficient demulsification of oil-water emulsification and demulsification effect. Difference

[0004] The Chinese patent whose notification number is CN02213619 discloses a crude oil ultrasonic-electric field combined desalting device, the Chinese patent whose notification number is CN03253324 discloses a kind of demulsification device for oil-water emulsion, and the Chinese patent whose notification number is CN03139172 discloses a smooth A method and device for demulsifying oil-water emulsions through the combined action of current and countercurrent ultrasonic waves. The Chinese patent application number 201020573668.2 discloses a single-channel feeding ultrasonic-electric desalination combined device. The Chinese patent application number 201020575233.1 discloses a A multi-channel feeding parallel ultrasonic-electric desalination combined device, the above-mentioned several patent schemes all propose that the ultrasonic sound intensity is not greater than 0.5W / cm 2 , the existing defect is: With the change of crude oil properties and the change of salt and water content of crude oil, it is impossible to carry out fine adjustment of ultrasonic parameters

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