Implementation method for electric dust removal of high-frequency high-voltage SIR power supply

Abstract

The invention relates to an implementation method for electric dust removal of a high-frequency high-voltage SIR power supply. The implementation method comprises the following steps of: inputting a three-phase 380V 50-60HZ alternating-current power supply, and performing three-phase controllable rectifying and wave-filtering to form about 520V direct-current voltage; carrying out high-frequency inversion on the 520V direct-current voltage by virtue of an IGBT module, and inputting the 520V direct-current voltage subjected to the high-frequency inversion into a high-frequency rectifying transformer; boosting inversion waveforms to be about 70 kv by virtue of a high-frequency transformer, and rectifying by virtue of a high-frequency rectifying bridge to obtain voltage waveforms, and supplying the voltage waveforms to a polar plate of an electric dust collector through a current-limiting resistor R0; outputting current and voltage, and feeding back the output current and voltage to a DSP controller to change pulse working efficiency or pulse width, and feeding the changed pulse working efficiency or the pulse width to an IGBT full-bridge high-frequency inverter through an isolating driver to regulate output current and voltage; and realizing output open circuit protection, short circuit protection, overheat protection on transformer oil and an IGBT, output flashover control and processing, and the like by virtue of the DSP controller of a digital signal processor.

Description

technical field [0001] The invention relates to a novel electric dust removal technology for a power supply, in particular to a method for realizing a high frequency and high voltage power supply suitable for the field of electric dust removal. It belongs to the field of environmental protection. Background technique [0002] With the rapid development of modern industry, it inevitably brings environmental pollution problems. During the production process of industrial products, a large amount of dust will be emitted, which will seriously pollute the air and endanger human health if the dust spreads with the wind. Therefore, industrial flue gas must be dust-treated before it is discharged into the atmosphere. There are two main traditional dust removal methods, one is filtration technology, which separates dust from air; the other is to separate gas from dust through centrifugal force; these two methods are used in industry, but There are disadvantages such as low efficie...

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Problems solved by technology

Throughout the above, they cannot keep up with the continuous improvement of environmental protection standards and the objective requirements of energy saving and sustainable development. The core problem is that the operating frequency of the power supply is 50HZ, resulting in the volume of the power transformer and filter inductor capacitor of the power supply. Huge, consumes energy materials, consumes space, and affects the improvement of dust removal efficiency

[0006] To sum up, the traditional low-frequency rectifying power T / R of the electrostatic precipitator has five major disadvantages: first, the operating frequency is low, and the conversion efficiency is as low as 75%, which consumes electric energy; second, the operating frequency is low, and the size of the transformer and filter Big, heavy, consume a lot of copper and iron, not in line with sustainable development, and at the same time high price, low cost performance; third, the power input is two-phase 380v AC power frequency power supply, and the power frequency phase adjustment, resulting in input power factor As low as 0.7, it will cause a lot of electromagnetic interference to the power grid, and the electromagnetic compatibility is poor, which is not in line with the natural and harmonious development; fourth, the bulky power control and adjustment chassis and the power frequency transformer for isolation and boosting are separated into two places, which consumes space and increases Infrastructure costs; Fifth, the output ripple is large, resulting in low corona voltage, and the waveform is a single power frequency wave, which makes it impossible to adapt to the working conditions of high specific resistance and fail to meet the new requirements of dust emission standards in the field of environmental protection (2004 China The dust emission standard of thermal power plants has been reduced from 200 mg / m3 in the 1990s to 50 mg / m3)

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