Constant-current source intelligent control cabinet for crude oil electric dehydration

Abstract

The invention discloses a constant-current source intelligent control cabinet for crude oil electric dehydration. According to the constant-current source intelligent control cabinet, thyristor devices are connected in a power supply main loop to serve as switches to control on-off of the main loop, inductors in the main loop are also controlled by the thyristor devices as switches, and the on andoff of each thyristor device are controlled by an intelligent special controller; detecting, displaying and controlling devices for a working state are all connected to a PLC and control; And the PLCcontroller is composed of a CPU ST40 of the Siemens S7-200SMART series and an expansion module EM AE04. According to the invention, 1, compared with a device adopting a contactor, the maintenance work and the cost can be saved, the service life is greatly prolonged, and the explosion-proof grade and safety of the cabinet are improved; and 2, due to the adoption of a PLC controller, the reliability of detection and control work is improved, and the system is convenient to expand and suitable for the change of on-site conditions.

Description

technical field [0001] The invention relates to a control cabinet, in particular to a constant current source intelligent control cabinet for electric dehydration of crude oil. Background technique [0002] At present, most of my country's oil fields have entered the stage of high water-cut production. The water content of crude oil has caused great troubles to oilfield gathering, transportation and refining, and its discharge will also pollute the environment. Therefore, crude oil dehydration has become an indispensable process in oil fields. Chinese Patent No. CN203942152U discloses a product of "Crude Oil Electric Dehydration Constant Current Source Automatic Control Cabinet", which can provide a power control device for the crude oil electric dehydration process. However, the control circuit and main circuit of this product use ordinary electrical devices. Compared with electronic devices and power electronic devices, not only are the devices less integrated, less reliab...

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Problems solved by technology

However, the control circuit and main circuit of this product use ordinary electrical devices. Compared with electronic devices and power electronic devices, not only the device has lower integration, poor reliability, and shorter life, but also does not have intelligence. Therefore, the performance of this product is limited to a certain extent, and it is difficult to adapt to the complex on-site environment of crude oil dehydration production

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