What are the advantages and application scope of wet electrostatic precipitator?
What is wet electrostatic precipitator
There are several structural forms of wet electrostatic precipitator. One is to use corrosion-resistant conductive materials (non-metallic materials with excellent conductivity or corrosion-resistant metal materials) as the dust collector, and the other is to use non-metallic materials with conductive water film formed by spraying or water injection as the dust collector.
Wet electrostatic precipitators can be divided into horizontal (horizontal) and vertical (vertical). The horizontal flow type is mostly plate structure, and the flow direction of gas is in and out in the horizontal direction. Its structure is similar to dry electrostatic precipitator. The vertical flow is mostly tubular flow, and the air flow direction is vertical flow. Generally speaking, under the same ventilation cross-sectional area, the efficiency of vertical flow wet electrostatic precipitator is twice that of horizontal flow.
Working principle of wet electrostatic precipitator
The dust deposited on the plate can be washed off with water. Wet cleaning can avoid dust generation from dust collection and achieve high dust removal efficiency. Since there is no vibration device, the operation is more reliable. The device using spray water or overflow water to form conductive film on the surface of dust collector has problems such as corrosion, sludge and sewage treatment. It can only be used when the dust concentration is low and the dust removal efficiency is high. The wet electrostatic precipitator uses corrosion-resistant conductive materials as the precipitator, which does not need long-term spraying or overflow water. According to the operation of the system, it only needs to be washed regularly, the water consumption is very small, it can be recycled, and the dust collection system basically has no secondary pollution.
The advantages of environmental friendly wet electrostatic precipitator are as follows
1. Double cone tower is used for dust removal to prevent mud and water from contacting the cylinder wall and prevent dust blockage.
2. A large amount of water is used for dust removal to accelerate the circulating water. The water temperature is low, which can solve the problems of pipeline scaling, reducing water evaporation and poor dust removal effect.
3. The nozzle is installed outside the area with dust, so that the dust does not contact the nozzle, so as to solve the problem that the nozzle is blocked and the water cannot be sprayed, which affects the dust removal effect.
4. The two towers are directly installed on the two chimneys of the shaft kiln to avoid the resistance caused by the flue gas walking on the curved road. The equipment resistance is very low and there is no need to use induced wind to produce flue gas.
5. All circulating water shall be used and shall not be discharged or wasted under the kiln.
6. After dust collection, sewage can be quickly separated from mud and water through mud water separator. The separated sludge does not need any sludge discharge equipment and is continuously discharged into the biaxial mixer in the form of porridge. The recovered mud is 100% recovered, without secondary pollution caused by discharge to the ground.
Application scope of wet electrostatic precipitator:
Blue smoke / yellow smoke, "gypsum rain" and "fertilizer rain" produced by PM2.5 (including S03 acid mist, fly ash particles, gypsum particles, sulfuric acid crystals, fine droplets, mercury and other pollutants) after wet flue gas desulfurization (denitrification).
High humidity electrostatic demisting (dust), acid fog, toxic heavy metals, and inhalable particles, especially good combined PM2.5, excellent dust removal effect, reduce the emission of multi dust in coal-fired boilers, steel sintering machines, glass furnaces, coal and other industries, reduce air pollution and reduce the risk of haze weather.
It is applicable to the treatment of PM2.5, aerosol, acid mist and oil fume after desulfurization and denitrification in coal-fired boilers, non-ferrous metal furnaces, glass furnaces, cement kilns, chemical production lines, textile production lines and other industries.