Technical Seminar - 2004
ELECTROSTATIC PRECIPITATORS
Presented by
Dipti Ranjan Khuntia
Roll # EE200117115
Under the Guidance of
Mr. GAYADHAR PANDA
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Introduction:
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Particulate Collection Device used in
industries to minimize air pollution
Principle of operation Electrostatic
attraction
Efficiency of 99% in many industries
Can handle large gas volumes with a wide
range of inlet temperatures, pressures, dust
volumes, and acid gas conditions
Can collect particles of varying sizes in dry
and wet states
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Theory of Precipitation:
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Theory of PrecipitationCharging, Collecting & Rapping
Particle charging Discharge & Collection Electrodes
Corona Discharge Avalanche Multiplication
Ionization of gas molecules
Particle Charging Mechanism Field charging, Diffusion
charging, Electron charging
Particle Collection
Particle Removal
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Particle Charging:
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Corona Discharge
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
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Ionization of Gas
Molecules
Particle Charging
Field charging,
Diffusion charging,
Electron charging
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
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Particle collection
Particle Removal by
rapping
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Components of an Electrostatic Precipitator
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Discharge electrodes
Collection electrodes
High voltage electrical systems
Rappers
Hoppers
Shell
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Discharge Electrodes:
Typical wire discharge electrodes Rigid frame discharge electrode design
Typical rigid discharge electrode
Flat-plate discharge electrode
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Collection Electrodes:
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
High Voltage Electrical system
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Transformerrectifier (T-R) sets
Primary voltmeter
Primary ammeter
Secondary
voltmeter
Secondary
ammeter
Spark meter
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Rappers:
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Typical
hammer/anvil
rappers for
collection plates
Typical magneticimpulse rappers
for collection plates
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Hoppers:
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Strike plates
Poke holes
Vibrators
Rappers
Rotary airlock discharge device
Hopper
Double-dump discharge device
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Conveyors:
Drag conveyor
Screw conveyor
Pneumatic conveyor for transporting dust from ESP
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Types of Electrostatic Precipitators
Gas Flow through a tubular precipitator
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Tubular Precipitators
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Plate Precipitators
Gas flow through a plate precipitator
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Cold-side ESPs
Cold side ESP’s
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Cold side ESPs
1) volume of flue gas that
is handled is less
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3)
less costly
overall size of the unit
is smaller
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used to remove fly
ash from boilers that burn
high sulfur coal
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Hot Side ESPs
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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
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Wet Side ESPs
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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
reentrainment or with
back corona
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Dry Side ESPs
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Particles are charged
and collected in a dry
state
Dust particles
collected are removed
by rapping
Used in steel
furnaces, cement
kilns and fossil-fuelfired boilers
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Conclusion
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All ESPs, no matter how they are grouped, have
similar components and operate by charging
particles or liquid aerosols, collecting them, and
finally removing them from the ESP before
ultimate disposal in a landfill or reuse in the
industrial process
The precipitator should be designed to provide
easy access to strategic points of the collector
for internal inspection of electrode alignment, for
maintenance, and for cleaning electrodes,
hoppers, and connecting flues during outages
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Presented by :- Dipti Ranjan Khuntia (EE200117115)
Technical Seminar - 2004
Presented by :- Dipti Ranjan Khuntia (EE200117115)