1. INTRODUCTION TO PRECIPITATORS
ELECTROSTATIC PRECIPITATOR
RABINDRA NATH DUTTA()
SHRI SHANKARACHARYA INSTITUTE OF TECHNOLOGY AND MANAGEMENT,BHILAI
NEED OF ESP
Environment protection has become a crucial problem and the authorities are requested to set increasingly more stringent limits , one of which is the emissions from the industrial plants of solid particulate and other gaseous pollutants.
COMPONENTS USED IN ELECTROSTATIC PRECIPITATOR
Electrodes
440V 50HZ 3φ AC supply
High voltage transformer
Rectifier
Insulators
Hooper
ELECTRODES
Discharge electrode:- Electrodes wire which carries negatively charged high voltage (between 20 to 80KV) act as discharge or emitting electrodes.
Collector electrode :- Electrode plate / wire which carries positively charged high voltage act as Collecting electrodes. Collector electrodes Discharge electrode
INTRODUCTION TO PRECIPITATORS
 An electrostatic precipitator is a large, industrial emission-control unit. It is designed to trap and remove dust particles from the exhaust gas stream of an industrial process. Precipitators are used in these industries:
Power/Electric
Cement
Chemicals
Metals
Paper
WORKING
Electrostatic precipitation removes particles from the exhaust gas stream of an industrial process. Often the process involves combustion, but it can be any industrial process that would otherwise emit particles to the atmosphere. Six activities typically take place:
Ionization - Charging of particles
Migration - Transporting the charged particles to the collecting surfaces
Collection - Precipitation of the charged particles onto the collecting surfaces
Charge Dissipation - Neutralizing the charged particles on the collecting surfaces
Particle Dislodging - Removing the particles from the collecting surface to the hopper
Particle Removal - Conveying the particles from the hopper to a disposal point.
TECHNICAL SPECIFICATION
ADVANTAGES OF E.S.P
This is more effective to remove very small particles like smoke, mist and fly ash.
The dust is collected in dry form and can be removed either dry or wet.
FACTORS AFFECTING THE PERFORMANCE OF E.S.P
Corona characteristics
Resistivity of the particles.
Gas velocity
Rapping behavior