Is the electrostatic precipitator controlled by high frequency power supply suitable for the electrostatic precipitator of sintering machine head?

1. For a long time, the electrostatic precipitator of sintering machine head in iron and steel plant has become a long-standing problem in the field of electrostatic precipitator, with low efficiency, small electric field current, low breakdown voltage and frequent flashover. Through the understanding and analysis of some sintering machine heads using high frequency power supply, it is found that high frequency power supply can effectively improve the working current of electric field and improve the efficiency of electrostatic dust removal. However, due to the complex working conditions and great changes of the sintering machine head, the FM high-frequency power supply currently used is difficult to adapt to its changes, especially under light load, and its operation reliability is poor. Using amplitude modulation high frequency power supply can solve this problem well.

2, FM high frequency power supply operation weakness

We know that high frequency power supply is a kind of power supply based on switching frequency conversion technology. The series resonance expansion circuit used in this technical circuit comes from ordinary high-frequency power supply, which generally emphasizes the stability of its output waveform, the load is relatively stable, and it works in non-discharge state. When applied to ESP, the electric field load changes greatly, and spark discharge often occurs. Using frequency modulation and voltage regulation, only the average output voltage of transformer is adjusted. Because the bus voltage is unchanged, the peak value of transformer output voltage is higher. When the working condition of the electrostatic precipitator at the sintering machine head changes greatly, the breakdown voltage is reduced and the flashover is frequent, the switching frequency of the equipment operation has to be reduced, which is only 6- 10 kHz, far less than the designed 20KHZ. Transformer impedance is reduced, current surge amplitude is large, power conversion efficiency is reduced, voltage regulation effect is not good, and reliability is reduced.

3. Introduction of thyristor IGBT amplitude modulation high frequency power supply.

Introduction of SCR-IGBT amplitude modulation high-frequency power supply Xiamen Tianyuan Xing Environmental Protection Technology Co., Ltd. has developed a new type of electrostatic dust removal high-frequency power supply to overcome the weakness of high-frequency power supply of sintering machine dust collector, which has five national patents. It overcomes the shortcomings of poor adaptability, low continuous output power and low frequency modulation efficiency of FM high-frequency power supply, and better adapts to the transformation of electrostatic precipitator at sintering machine head. Specific features:

1. Bus voltage control technology is adopted to make the primary input voltage of high-frequency transformer variable, so as to meet the demand of dynamic change of electrostatic precipitation.

2. The mode of amplitude modulation and voltage regulation makes the high-frequency inverter run at the designed switching frequency of 20KHZ for a long time, ensuring that the conversion efficiency of the transformer is >: 93% unchanged, and ensuring that the high-frequency transformer works at the designed frequency for a long time without being affected by the change of working conditions.

3. The maximum corona current is provided by continuous current mode, which overcomes the shortcoming that frequency modulation mode can not realize continuous current.

4. The flashover control adopts AM and FM * * *, which has small current impact and reliable recovery, and can be applied to harsh environment.

Double shell design ensures the stability and reliability of outdoor work.

5. Under the same working conditions, the corona power of AM high frequency power supply is 20% higher than that of FM high frequency power supply, and the efficiency is improved by more than 10%.