Dewatering power supply for rectangular-wave alternating-current crude oil

Abstract

The invention relates to a dewatering power supply for rectangular-wave alternating-current crude oil. The power supply consists of a main circuit 1, a control circuit 6 and an optimal control circuit 9 which are connected in series, wherein a full-bridge uncontrollable rectifying and filtering circuit 2, a voltage regulation circuit 3, a rectangular wave generating circuit 4 and an intermediate frequency transformer 5 in the main circuit 1 are sequentially connected in series; the control circuit 6 comprises a voltage regulation and control circuit 7 using a TL494 pulse width modulation chip as a core and a rectangular wave generation and control circuit 8 based on an SG3525 pulse width modulation chip and is responsible for the disconnection of IGB devices in the voltage regulation circuit 3 and the rectangular wave generating circuit 4 so as to regulate the output voltage, frequency and duty ratios; the optimal control circuit 9 consists of an industrial control touch screen 10 and a PLC control circuit 11 which are connected in series; the industrial control touch screen 10 is used as a man-machine interface for transmitting parameters or recipe data input by users to a PLC and displaying power supply running information in real time according to signals provided by the PLC; and the PLC control circuit 11 is responsible for receiving information input by external circuits, carrying out processing by software and outputting voltage control signals to the voltage regulation and control circuit 7 and the rectangular wave generating and control circuit 8.

Description

technical field [0001] The invention relates to a power supply device for electric demulsification and dehydration of crude oil emulsion, especially suitable for demulsification and dehydration of high water content crude oil and aged oil emulsion. Background technique [0002] At present, most oilfields use traditional DC dehydration, power frequency AC dehydration, AC-DC composite dehydration and other methods for demulsification and dehydration of crude oil emulsion. These methods use the dipole coalescence and oscillation coalescence produced by the electric field force to destroy the stability of the oil-water interface film of the emulsion, make it rupture, promote the aggregation of water particles into large water droplets, and make the water settle down from the crude oil to achieve Oil and water separation. However, the impact of the electric field generated by the conventional dehydration power supply on the oil-water interface film is weak, and it cannot be auto...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of weak demulsification, poor self-adaptability and unstable electric field when dehydrating crude oil with high water content and aging oil existing in conventional dehydration power supplies, the present invention provides a rectangular wave AC crude oil dehydration power supply

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