A pulse power supply control system for electrostatic dust removal

Abstract

The invention discloses an electrostatic-precipitation pulse power supply control system, which comprises a major loop, a controller and a trigger driving sampling loop, wherein the major loop comprises a first loop which provides a continuous fundamental wave voltage for a dust remover, and a second loop which provides a discontinuous pulse voltage for the dust remover; the controller controls the fundamental wave voltage to be lower than full breakdown voltage of spark discharge inside the electric field of the dust remover; and the controller controls the pulse voltage to be 3-5 times of the fundamental wave voltage. The voltage output by the system is large; when the dust remover performs spark discharge, the turn-off time is not required; the field energy is quickly recovered; the back corona site can be overcome; the dust collection effect is obvious, in particular to small dust in the electrostatic precipitator; the working frequency is high; the power factor is large; a three-phase power supply is used for supplying power; the three-phase power grid is balanced, so that the harmonic pollution to the power grid is low, the volume and the weight of a transformer are reduced, and the consumable is saved.

Description

technical field [0001] The invention relates to the field of electrostatic precipitators, in particular to a control system for electrostatic precipitator pulse power supply. Background technique [0002] The electrostatic precipitator is a kind of flue gas purification equipment. Its working principle is: when the dust particles in the flue gas pass through the high-voltage electrostatic field, they collide with the positive and negative ions and electrons between the electrodes and are charged (or charged during the ion diffusion movement). Electricity), the dust particles with electrons and ions move to the opposite electrode and accumulate on the opposite electrode under the action of the electric field force, and the dust on the electrode falls into the collection ash hopper by vibration, etc. The flue gas of the device is purified to achieve the purpose of protecting the atmosphere and the environment. [0003] At present, the traditional electrostatic precipitator po...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional electrostatic precipitator power supply method at home and abroad has a thyristor phase-controlled voltage-regulated rectifier power supply device, which has the advantages of simple structure and large capacity, but also has some shortcomings: 1. The working frequency is 50Hz (or 60Hz abroad), and the frequency Low, the conversion efficiency is as low as 75%, which consumes electric energy; 2. Due to the low operating frequency, the transformer and filter components are large in size and weight, and consume a lot of steel and copper; 3. The power input is two-phase power, which is a load on the grid Unbalanced and power frequency phase-controlled voltage regulation, not only the power factor is low, but also the input and output terminals contain a lot of low-order harmonic pollution that is difficult to filter, which greatly interferes with the power grid

4: The thyristor is a semi-controlled device, and the output voltage cannot be adjusted immediately when the spark discharge or short circuit occurs, and the dynamic response speed is slow

5: 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 difficult to meet the new requirements of dust emission in the field of environmental protection

The above reasons have become the bottleneck for the further improvement of the traditional electrostatic precipitator power supply performance. With the improvement of the country's environmental protection requirements, the traditional electrostatic precipitator power supply precipitators are difficult to meet the national environmental protection requirements.

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