What are the basic requirements for the power supply of the electrostatic precipitator?

The electrostatic precipitator adopts the power frequency thyristor power supply, and the dust removal effect will be significantly reduced when the dust specific resistance is relatively high and the anti-corona phenomenon is prone to occur, which generally fails to meet the design indicators and environmental protection emission standards of the original electrostatic precipitator.

Power frequency power supplies have the following disadvantages:

1) The working frequency is low, and the efficiency conversion is low (generally below 70%), so the energy consumption is high;

2) The power input is a two-phase 380V AC power frequency power supply, and it is also a power frequency phase adjustment, which causes the input power factor to be as low as below, which is easy to cause the imbalance of the power distribution system;

3) The output ripple is large, and the average voltage is about 25% lower than the pulsating peak voltage, resulting in low corona voltage, and the waveform is a single power frequency wave, which is difficult to meet the environmental protection emission requirements under high concentration of dust, high specific resistance and other working conditions;

4) The working frequency is low, the transformer and filter are large in size and heavy in weight;

5) The huge power control and regulation cabinet and the power frequency transformer for isolation and step-up are separated from each other, which consumes space, wastes cables, and increases infrastructure investment costs.

The high-voltage electrostatic precipitator is based on the principle of electrostatics, adding DC high voltage to the electrode and the dust collector to form an electric field. Under the action of the electric field, the gas in the electric field is ionized, forming a corona, once the dust-containing gas passes through the electric field, the dust particles will be charged, forming ions and moving to the dust collector pole. The efficiency of the electrostatic precipitator is determined by a variety of factors, and its power supply mode and thin supply characteristics are all important factors.

Under the same conditions, the higher the voltage added by the electric sitter, the higher the efficiency of dust collection, and the breakdown voltage borne by the electric field is determined by the mechanical structure form of the electric field and the nature, concentration, humidity, flow rate, etc. of the smoke. Therefore, it is necessary to select the power supply mode and power supply characteristics of the power supply device according to the actual situation of the electric field, so as to obtain the best effective corona power and achieve the highest dust removal efficiency. The electrostatic precipitator requires that the power supply device should first meet the requirements of establishing the electric field voltage, and have good control characteristics and complete protection performance.

Introduction: The electrostatic precipitator is the equipment that every thermal power plant must be equipped with, and its main function is to remove the harmful particulate matter contained in the exhaust gas emitted from the stove or oil-fired boiler, so as to reduce the pollution degree of the exhaust gas emitted by them to nature. This article mainly introduces what are the national standards for electrostatic precipitators.

The national calendar and home standard of electrostatic precipitator

According to the National Development and Reform Commission of the People's Republic of China on December 14, 2004 issued the "People's Republic of China Electric Power Industry Standard - Electrostatic Precipitator".The standard of the electrostatic dust collector includes its inspection rules, packaging, marking, storage and transportation, installation and testing. This standard was revised by the General Office of the National Development and Reform Commission to DL T514-1993.

The electrostatic precipitator can be designed differently according to different types of work and engineering conditions, and there is no longer any restriction on the applicable engineering conditions.

GB T 1184 represents the tolerance between the shape and position of the electrostatic precipitator and the unmarked tolerance value;

GB T 1804 represents the linearity of tolerances not specified in general tolerances and the tolerances between angles and dimensions;

GB T 13931 represents a method for testing the performance of electrostatic precipitators;

DL T 461 represents the code of conduct for the operation and maintenance of electrostatic precipitators in coal-fired power plants;

DL T 678 represents the general technical conditions required for the welding of steel structures in power stations;

DL T 5031 represents the technical specifications and acceptance criteria for the construction and construction of electric power (pipelines);

DL T 5047 represents the technical specifications and acceptance standards for power construction and construction (boiler units);

JB T stands for Electrostatic Precipitator with Porcelain Sleeve as Porcelain Insulator;

JB T stands for electrostatic precipitator with a porcelain shaft as a porcelain insulator;

JB T stands for Electrostatic Precipitator with Wall Sleeve as Porcelain Insulator;

JB T 9688 represents a complete set of equipment for high-voltage electrostatic precipitators.

The bulk resistance of a single electrostatic precipitator must be less than or equal to

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High voltage power supply for electrostatic precipitator:

When the deposition electric field produces spark discharge for some reason, because the output current of the power supply is "constant current", the current in the electric field will not increase, and the input current of the power grid is greatly reduced, only 10 of the rated value, which ensures the safety of the power supply equipment. At the same time, due to the "constant current", the discharge channel disappears by itself and does not transition to arc discharge, which protects the corona wire and cathode plate.

It can adapt to the change of working conditions, overcome the secondary poplar dust caused by rapping, and has the ability to inhibit corona occlusion and cathode hypertrophy. When the dust concentration in the electric field increases and the flow rate accelerates, the electric field is in a high-impedance state, because the output current "constant current" remains unchanged, the voltage in the electric field will automatically rise, and the electric field will get more electric energy, and the purification effect is good.

The operating voltage is high, and it can suppress discharge, and is insensitive to mechanical defects.

The power supply structure is simple, the parallel modular design is adopted, the maintenance is convenient, and the power failure rate is low.

There is fast overvoltage protection and responds to 1ms

The power factor cos does not change with the operating power level, and the power saving effect is obvious.

Electrostatic precipitator high voltage power supply.

Electrostatic precipitators can only achieve high efficiency when they are well powered. With the increase of the power supply voltage, the corona current and corona power increase sharply, and the effective driving speed and dust removal efficiency also increase rapidly. Therefore, in order to fully play the role of the electrostatic precipitator, the power supply unit should be able to provide sufficient high voltage and have sufficient power.

The power supply device of the electrostatic precipitator mainly includes: step-up transformer, rectifier and control device, in addition, there is a high-voltage cable that outputs the rectified high-voltage direct current, and the direct current is input into the electrostatic precipitator through the high-voltage cable. The basic requirements for the power supply device are:

It provides high electric field strength and corona current required for dust charge and dust collection, reliable operation, long service life, and less inspection and maintenance.

In order to improve the efficiency of an electrostatic precipitator, the supply voltage must be as high as possible. However, when the voltage rises to a certain value, a spark discharge will be generated, and the voltage drops between the poles in an instant, and the disturbance of the spark causes secondary dust on the plates. A large number of practical experiences have shown that each electrostatic precipitator or each electric field has an optimal spark rate (the number of sparks produced per minute is called the spark rate), which is generally about 50 100 min, when the gain from the increase in voltage is exactly offset by the loss caused by the spark.

If the voltage rises again, the gain will not be enough to offset the loss. Generally speaking, the electrostatic precipitator has the highest average voltage and the highest dust collection efficiency when operating at the optimal spark rate. Therefore, with the help of an instrument that measures the average voltage, the electrostatic precipitator can be easily adjusted to the optimal operating conditions.