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Electrostatic precipitator

Air volume: 37000-353000m³/h

Maximum operating temperature: 400℃

Electrostatic precipitator (ESP), also known as high voltage electrostatic precipitator, electrostatic dust collector, is a dust collector using electric power. It is one of the commonly used environmental protection equipment for dust gas purification. It is widely used in electric power, metallurgy, building materials, chemical industry, and other industries. Compared to other types of dust collectors, the electrostatic precipitator has the advantages of less energy consumption, high dust removal efficiency.

The power supply of the electrostatic precipitator is composed of a control box, a booster transformer, and a rectifier. The output voltage of the power supply also has a great influence on the efficiency of dust collection. Therefore, the operating voltage of the electrostatic precipitator should be kept at 40-75kV, even above 100KV.

Advantages of electrostatic precipitator

High efficiency of dust collection

Electrostatic precipitators can improve collecting efficiency by lengthening the electric field length. When the dust in the flue gas is in a general state, the collection efficiency can reach more than 99%. Using 4 or 5 electric precipitators will improve efficiency. When the ESP operates for several years, the efficiency of dust collection will decrease due to electrode corrosion and other reasons.

Large air volume

Because the structure is easy to modularize, the dust collector can be scaled up. At present, the smoke handling capacity of a single electrostatic precipitator has reached 200X104m3/h. It is not easy and economical to deal with such a large amount of smoke by bag filter or cyclone dust collector.

Low resistance, low energy consumption

The energy consumption of the electrostatic precipitator mainly includes resistance loss, power supply device, heating and insulation, and vibration motor. Because of the low energy consumption, rarely replace the wearing parts, so the operating cost is much lower than the bag filter.

Advanced structural design of components

The shell of the ESP adopts a frame structure with high strength, good stability. And it can be designed according to different pressure and temperature resistance requirements. The air inlet and outlet can be designed into various forms according to the process layout and flue gas characteristics, and the process layout is flexible.

Wide application and the small investment cost

The electrostatic precipitator can collect high-temperature flue gas with particle size less than 0.1um and 300 ~ 400~C. Electrostatic precipitators also can be used for high temperatures and high pressure of flue gas. The practice shows that the higher the amount of smoke, the more economical the investment and operation cost of the electrostatic precipitator.

Good performance

Blocking and diversion type airflow is adopted. The airflow is evenly distributed and there is no ash blocking phenomenon. The discharge electrode is properly connected to the frame, without any disconnection.

Electrostatic precipitator in cement plant
electrostatic precipitator project

Specifications of electrostatic precipitator

ModelsEffective sectional areaAir volume (m³/h)Max operating temperature (℃)Pressure resistance (Pa)Wind speed(m/s)Design efficiencyInlet dust concentration (g/Nm³)Outlet dust concentration (g/Nm³)Resistance loss (Pa)
15-III153700040060000.7-0.9≥99.9<500<50mg<200
20-III205100040060000.7-0.9≥99.9<500<50mg<200
30-III3075600040060000.7-0.9≥99.9<500<50mg<200
40-III4010000040060000.7-0.9≥99.9<500<50mg<200
50-III5012600040060000.7-0.9≥99.9<500<50mg<200
60-III6015200040060000.7-0.9≥99.9<500<50mg<200
70-III417700040060000.7-0.9≥99.9<500<50mg<200
80-III0821000040060000.7-0.9≥99.9<500<50mg<200
90-III0923000040060000.7-0.9≥99.9<500<50mg<200
100-III10025200040060000.7-0.9≥99.9<500<50mg<200
110-III11028000040060000.7-0.9≥99.9<500<50mg<200
120-III12030000040060000.7-0.9≥99.9<500<50mg<200
140-III14035300040060000.7-0.9≥99.9<500<50mg<200
150-III15037800040060000.7-0.9≥99.9<500<50mg<200

Electrostatic precipitator working principle

The electrostatic precipitator uses high voltage to separate the gas and dust. The electric field is designed with a linear discharge electrode (cathode) and a platy dust-collecting electrode (anode). When dc high voltage is added between the electrodes, an uneven electric field will be generated between the electrodes due to the different forms of discharge electrode and dust-collecting electrode. When the applied DC voltage reaches a certain value, the electric field in the local area around the discharge electrode is strong enough to ionize the gas and generate electrons and positive and negative ions. The positive ions quickly reach the discharge electrode and are neutralized, while a large number of electrons and negative ions move towards the dust collecting electrode under the action of electric field force, which are corona discharge and corona current.

When the dusty gas passes through the channel between the electrodes, the electrons and negative ions in the corona current (because positive ions have a small area of action, most of the dust is adsorbed by electrons and negative ions) will be adsorbed on the dust, making the dust charged. Under the action of electric field force, the charged dust moves towards the dust collecting electrode, depositing on the dust collector plate and releasing the charge. When the dust is deposited to a certain thickness, the dust is cleaned into the dust hopper and discharged through the vibration device, and the separation process is completed.

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