This ppt helps to know the basic working of esp and its component description.......

1. Prepared by
s.yokesh

2. ELCTROSTATIC PRINCIPLE :-
An electrostatic precipitator (ESP) is
an device that removes dust particles from a
flowing gas (such as air) using the force of an
induced electrostatic attraction (i.e, like
charges repel; unlike charges attract)
Electrostatic precipitators are highly efficient
filtration devices that allow the flow of gases
through the device, and can easily remove fine
particulate matter such as dust and smoke from
the air stream.

3. COMPONENTS USED IN ELECTROSTATIC PRECIPITATOR
 Electrodes
 440V 50HZ 3φ AC supply
 High voltage transformer
 Rectifier
 insulators
 Hooper

4. 20 – 80 KV dc
BASIC DIAGRAM OF AN ELECTROSTATIC PRECITATOR
440V, 50Hz
Control cabinet High voltage
transformer
Rectifier Dust gas
Clean gas
Hooper
Discharge
electrode
Collector
electrode

5. Control cabinet
Control cabinet is used to interconnect the 3φ ac supply and
transformer through wires.
Transformer
Transformer is used to step up or step down the voltage as
per the design of Electrostatic precipitator.
Rectifier
Rectifier is used to convert the given ac supply into dc supply.
Hooper
Hooper is used to store the dust particles and ash content
coming out from the Electrostatic precipitator.

6. Electrodes : -
Based on DC current flow terminals
elctrodes can be divided as below:-
Discharge electrode :-
Electrodes wire which carries
negatively charged high voltage
(between 20 to 80KV) act as discharge or
emitting electrodes.
Collector electrode :-
Electrode wire which carries positively
charged high voltage act as
Collecting electrodes.
Collector
electrodes
Discharge
electrode

7. WORKING OF ELECTROSTATIC PRECIPITATOR
Several things happen very rapidly (in a matter of a millisecond) in the small area
around the discharge electrode. Electric field is emerged due to dc terminal
arrangement. The applied (-) voltage in discharge electrode is increased until it
produces a corona discharge, which can be seen as a luminous blue glow around
the discharge Electrode.
Due to the formation of corona discharge,
free electrons are emitted with high
velocity from discharge electrode.
This fast moving free electrons strikes the
gas molecule thus emission of free
electron from gas molecules takes place.
The positive ion molecule move towards
discharge electrode by electrostatic
attraction
As a result using gas molecule more
free electrons are emitted near the
discharge electrode.
Stage - 1

8. Stage - 2
As the electrons leave the strong
electrical field area around the
discharge electrode, they start
slowing down. This free electron
again strikes the gas molecule but
this time they are captured by gas
molecule and became negatively
charged ion.
As the gas molecule are negatively
ionized they move towards the (+)
electrode (i.e., collector electrode).
This negative gas ion fills the
space of Dust particle and
becoming negatively charged
particle.
This particle are captured by
collector electrode using