ELECTROSTATIC PRECIPITATORS. Presented by-Deepak keshri IEC -CET Section- ee 1. Introduction. Particulate Collection Device used in industries to minimize air pollution. Principle of operation Electrostatic attraction. Efficiency of 99% in many industries.
Presented by-Deepak keshri
*Ionization of Gas Molecules
*Particle Removal by rapping
Typical wire discharge electrodes
Rigid frame discharge electrode design
Typical rigid discharge electrode
Flat-plate discharge electrode
*Transformer-rectifier (T-R) sets
*Typical hammer/anvil rappers for collection plates
*Typical magnetic-impulse rappers
for collection plates
Rotary airlock discharge device
Double-dump discharge device
Pneumatic conveyor for transporting dust from ESP
Cold side ESPs
1) volume of flue gas that is handled is less
2) less costly
3) overall size of the unit is smaller
4) used to remove fly ash from boilers that burn high sulfur coal
*used in high-temperature applications (Cement kiln)
*the gas volume treated in the ESP is larger
*the overall size of the precipitator is larger making it more costly
*structural and mechanical problems occur in the precipitator shell
*Wet ESPs are used for industrial applications where the potential for explosion is high .
*When dust is very sticky, corrosive, or has very high resistivity .
*It does not have problems with rapping rentrainment or with back corona .
*Particles are charged and collected in a dry state .
*Dust particles collected are removed by rapping.
*Used in steel furnaces, cement kilns and fossil-fuel-fired boilers.