Intelligent medium-frequency high-voltage double-output direct current power supply for electric dust removal

Abstract

The invention discloses an intelligent medium-frequency high-voltage double-output direct current power supply for electric dust removal. The direct current power supply comprises a three-phase air switch with a tripper, a three-phase rectifier, a filter, a single-phase medium-frequency inverter, an air switch, a medium-frequency step-up transformer, a medium-frequency double half-wave rectifier,a first high-voltage direct current output sampling circuit, a second high-voltage direct current output sampling circuit, an isolating driver and a digital signal processing (DSP) controller, wherein the medium-frequency double half-wave rectifier of the direct current power supply is used for outputting two paths of direct current high voltage; the two paths of direct current high voltage are fed back to the DSP controller through two paths of sampling circuits; and a control signal is output to the single-phase medium-frequency inverter by the DSP controller to adjust frequency and amplitude. The direct current power supply has the characteristics of high output voltage, balanced power grid input and capability of greatly reducing pollution to a power grid and improving the utilizationefficiency of power; and a medium-frequency high-voltage silicon rectifier double-output transformer which is matched with the direct current power supply has the characteristics of small volume, light weight, low manufacturing cost and high efficiency. The direct current power supply has a wide application range and can be applied to construction of a new dust removal electric field, synergetic reconstruction of an old electric field and the like.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrostatic dust removal, and in particular relates to an intelligent intermediate-frequency high-voltage dual-output DC power supply for electric dust removal involving intermediate frequency technology, double-output transformer technology and automatic control technology. Background technique [0002] Since a large amount of flue gas and fly ash are inevitably produced in industrial production, and the flue gas also contains a large amount of fine particle dust, if these fly ash and dust are directly discharged into the environment, it will cause serious environmental pollution, thus It not only causes different degrees of damage to the ecological environment, but also brings harm to people's health. For quite some time in the past, electrostatic precipitators have played a very important role in the process of controlling air pollution, and they have contributed a lot; however, with the...

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Problems solved by technology

Looking at the above, they are all unable to keep up with the objective requirements of the environmental protection standard "energy saving, sustainable development". The core problem is that the operating frequency of the power supply is 50HZ, which causes the power transformer and filter inductor and capacitor of the power supply to be bulky. , Consumes energy materials, consumes space, and affects the improvement of dust removal efficiency

The traditional low-frequency rectifying power supply 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, which makes the transformer and filter bulky. It is heavy and consumes a lot of copper and iron, which is not in line with sustainable development. At the same time, the price is high and the cost performance is low; the third is that the power input is a two-phase 380v AC power frequency power supply, and the power frequency phase is adjusted, resulting in low input power factor If it is below 0.7, it will cause great electromagnetic interference to the power grid, poor electromagnetic compatibility, and does not conform to 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. The fifth is that 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 fails to meet the new requirements of dust emission standards in the field of environmental protection (2004 China's firepower The power plant dust emission standard was reduced from 200 mg / m3 in the 1990s to 50 mg / m3)

Although there is a kind of electrostatic precipitator changed from three electric fields to five electric fields, it still cannot meet the requirement of 50mg / m3 emission concentration

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