High-frequency intelligent response electro-desalting power supply device

Abstract

The invention relates to a high-frequency intelligent response electro-desalting power supply device to solve the problems of high consumption of electricity for refining crude oil, reduction of electric field strength, low effect of electric desalting and dewatering, and the like due to increase of electric field current when the crude oil with high water content, high conductivity or severe emulsification is treated through the conventional electric desalting and dewatering. The high-frequency intelligent response electro-desalting power supply device comprises an electric desalting and dewatering pot, an in-pot electrode plate, a high-frequency intelligent response control cabinet (comprising a bridge rectifier, a capacitor filter, an insulated gate bipolar translator (IGBT) module, a programmable logic controller (PLC) control protection circuit and a current and voltage monitoring circuit), and an explosionproof high-frequency transformer. According to properties of different oil products, different frequencies are selected, and the aim of breaking emulsion is fulfilled under lower electric field strength; therefore, the current is reduced and electric energy is saved.

Description

technical field [0001] The invention belongs to the fields of electric dehydration of crude oil in oil fields and electric desalination of crude oil in oil refineries, and is mainly applicable to the desalination and dehydration of heavy and low-quality crude oil with high water content, high salt content and easy emulsification. Background technique [0002] With the rapid development of the world economy, the demand for crude oil is also increasing. The oil field has adopted various new technologies for oil recovery, which has increased the intensity and depth of extraction, making the nature of the extracted crude oil more and more complex. To reduce costs, some ground oil and heavy low-quality crude oil with high specific gravity, high viscosity, high acid value, high water content, high salt content and easy emulsification will also be refined. When processing these crude oils, the existing electric desalting technology usually has increased operating current, high powe...

AI Technical Summary

Problems solved by technology

The positive and negative electrode plates alternate with the oil-water interface to form an AC weak electric field, and a DC strong electric field is formed between the positive and negative electrode plates, but there is no direct circuit between the positive and negative electrode plates, which greatly saves electric energy compared with the AC transformer. The power consumption is about 0.18kWh, but there is also the fact that the greater the current, the greater the useless work consumed by the reactor, the power consumption is still high when refining poor oil products, the desalination and dehydration rate of the electric field is reduced, and it is difficult to achieve desalination. Requirements for salt content less than 3mg / L

[0006] The third is the high-speed electric desalination technology (patent number: CN0120753.1). The power supply part of this technology has not been changed, and it is still a full-impedance transformer. It mainly improves the internal parts of the tank to meet the requirements of large processing capacity. Requirements, in the refining of complex oil products, the power consumption is still relatively high, and there are also problems such as incomplete demulsification and oily drainage.

[0007] In addition, there is an energy-saving broadband transformer (ZL 200820218988.9). This transformer is also connected in series with a reactor, which also has the problem of energy consumption. The frequency is adjustable from 5-100Hz. In this range of frequency, it is not conducive to the demulsification of crude oil emulsion. of

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