High-voltage DC power supply, also known as DC high-voltage power supply, is a power supply that is input by AC power or three-phase power and output by DC voltage of thousands of volts or tens of thousands of volts or more. The output power is from hundreds to thousands of watts, which can be stabilized or stabilized. In the past, DC high-voltage power supply transformed AC power supply or three-phase power supply from power-frequency high-voltage transformer to AC high-voltage power supply, and then rectified and filtered to obtain DC high-voltage power. Because of the low frequency, the volume and weight of the power supply are relatively large, and the conversion efficiency and stability are poor. With the development and maturity of switching power supply technology, high-frequency switching technology combined with the characteristics of high-voltage power supply has become the mainstream of high-voltage DC power supply.

It is composed of two parts: constant current high voltage DC power supply and coke capture body (mechanical tower body). The former uses CS-III constant current high voltage DC power supply for electrostatic deposition; the latter uses TD sleeve type (concentric circle type), GD tube type, FD honeycomb type or SJD wet tube type in structure. The four structures are mainly composed of cylinder, discharge electrode (corona electrode) and suction and trapping electrode (precipitation electrode). High-voltage distributed DC power supply is a new type of DC power supply equipment, which is mainly used in small switching stations and user terminals. It provides reliable and uninterrupted power supply for secondary control lines (such as intelligent terminals such as microprocessor protection, indicator lights, analog indicators, etc.). It avoids the loss of protection of microprocessor protection when AC power failure occurs, and solves the problem of UP caused by overvoltage and harmonics. S failure leads to failure of microprocessor-based protection. At the same time, DC operation power supply can be provided for primary switchgear (spring mechanism vacuum circuit breaker, permanent magnet mechanism vacuum circuit breaker, electric load switch, etc.) which meets the power requirements of the device.

It is mainly used for gas purification in chemical fertilizer, coking, city gas, metallurgy, building materials, carbon, ceramics and other industries. It is used to recover tar from gas and coke oven gas, and remove impurities such as dust and water mist, so as to achieve the dual effects of material recovery and gas purification. It also plays a vital role in ensuring the normal and stable operation of equipment in the later section of the process.

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