Electrostatic Precipitators
An electrostatic precipitator is air pollution control device used to separate solid particulate matter from a contaminated air stream. Contaminated air flows into an ESP chamber and is ionized by electron emitting electrodes also known as the corona chamber. The suspended particles are charged by the electron field and migrate to a collection plate. Accumulate particulate matter is removed from the collection plates at periodic intervals by rapping or hitting the plates with rappers (mallets type hammers). Heavy particles fall to the base of the ESP where hoppers hold the removed particles for disposal.
Features:
- Refuse & sewerage sludge dryers and incinerators
- Coaland oil-fired boilers, coal driers and coal mills
- Production plants for the cement, limestone, gypsum, pulp and paper industry (kilns, mills, driers and coolers)
- Electro-metallurgical, chemical, gas and detergent manufacturing plants
- SO2, SO3, acid mist and ammonia control (wet ESPs)
ESP Advantages:
- ESPs are very efficient (up to 99% efficiency), even for small particles
- They are generally more economical than other particulate control devices: Operating costs are reduced by low energy consumption, minimal maintenance requirements and reduced cost on spare parts
- Can be designed to handle wet and dry gas compositions for a wide range of gas temperatures
- Can handle large volumes of gas flow with low pressure drop
