The working principle of the wet electrostatic precipitator is similar to that of the dry type. The high-voltage corona discharge charges the dust or water mist, and the charged particles reach the dust collecting plate under the action of the electric field force, but the dust is removed. The dry type electrostatic precipitator uses mechanical rapping, while the wet type electrostatic precipitator uses the flushing liquid to rinse the electrode, and the dust captured on the dust collecting board is flushed into the ash hopper and discharged. Compared with the dry dust collector, the wet electrostatic precipitator has high dust removal efficiency, small pressure loss, simple operation, low energy consumption, no moving parts, no secondary dust, low maintenance cost, short production downtime, and can work. Due to the compact structure of the flue gas, it can be combined with other flue gas treatment equipment and diversified design forms due to its compact structure.
1. When the same energy consumption is used, the efficiency of the wet dust collector is higher than that of the dry dust collector. The high energy wet dust collector washes the dust particles below 0.5 mm, and the dust removal efficiency is still high.
2. The dust removal efficiency of the wet dust collector is not only comparable to that of cloth bags and electrostatic precipitators, but also to the dust removal conditions that these dust collectors cannot. The wet dust collector has high exhaust gas treatment efficiency for purifying high specific resistance, high humidity, high temperature, flammable and explosive dust-containing gas.
3. The wet dust remover can remove the water vapor and some toxic and harmful gas pollutants in the gas while removing the dust particles of the dusty gas. Therefore, the wet dust collector can remove dust and treat the gas as exhaust gas.
Disadvantages of wet scrubbers:
1. The sediment discharged from the wet dust collector needs to be treated. The clarified washing water should be reused repeatedly, otherwise it will not only cause secondary pollution, but also cause waste of water resources.
2. When purifying corrosive pollution, the washing water (or liquid) will have a certain degree of corrosiveness. Therefore, the dedusting equipment should have certain anti-corrosion measures.
3. Wet dust collectors are not suitable for the treatment of organic waste gas containing water-repellent and hydraulic dust.
4. The application of wet scrubbers in cold areas is prone to freezing, so anti-freeze measures should be taken.
The wet dust collector, also known as the "water precipitator", is a device that brings dusty gas into close contact with the liquid, and uses the inertial collision of water droplets and particles and other functions to trap or enlarge the particles.
The wet scrubber combines the two forms of water bath and spray. First, the suction of the high-pressure centrifugal fan is used to press the dust-containing gas into a water tank filled with a certain height of water, and the water bath will adsorb a part of the dust in the water.
After a uniform split, the gas flows from bottom to top, while the high pressure spray head sprays water mist from top to bottom to capture the remaining dust particles. Its filtration efficiency can reach more than 85%.