3. Introduction
Wet Scrubbers are air pollution
control devices for removing
particles and gases from
industrial exhaust stream.
It is operated by introducing the
dirty gas stream with a scrubbing
liquid as water. Then gases are
collected in the scrubbing liquid.
Wet scrubbers are usually the
most appropriate air pollution-
control device for collecting
both, particulate and gas in a
single system alone.
4. Features
1. Gives high collection efficiency
of solid & gaseous pollutant.
2. Provides Maximum pressure
drop.
3. Fumes are also be absorbed
4. Maintenance cost is low
5. Complete wetting of the product
6. Emission of minimum product
through exhaust
7. Ability to handle high
temperature
5. Designing Procedure
The design of wet scrubbers depend on the
industrial process conditions and the nature of the
air pollutants involved in device.
Inlet gas features and dust properties (if present)
are of more importance.
Scrubbers can also be designed to collect
particulate matter and gaseous pollutants.
The versatility of wet scrubber allows it to be
built in numerous configurations.
And all are designed to provide good contact
between the liquid and polluted gas streams.
7. Working Principle
It relays on the liquid spray to remove dust particles from
gas streams. It is also used for the fume absorption hence
it is very useful in fume extraction system. It removes all air
pollutants by inertia of diffusional impaction and
reactions with absorbent.
8. Types of Wet Scrubber
Since wet scrubbers vary in complexity and its
method of operation so we divide it in following
categories. Scrubbers for particle collection are
categorized by the gas-side pressure drop of the
systems.
1. Low-energy scrubbers have pressure drops of less
than 12.7 cm of water.
2. Medium-energy scrubbers have pressure drops
between 12.7 and 38.1 cm of water.
3. High-energy scrubber have pressure drops greater
than 38.1 cm of water.
10. Advantages
Small space requirements: Scrubbers reduce the
temp & volume of the unsaturated exhaust
streams. So vessel sizes, fans and ducts downstream
are smaller than those of other control devices. It
results in lower capital costs and more flexibility.
No secondary dust sources: Once particulate
matter is collected, it cannot escape from hoppers or
during transport.
Handles high-temperature, high-humidity
gas streams: There is no temperature limit or
condensation problem can occur in bag-houses
11. Disadvantages
Corrosion Problems: Generally water and dissolved
pollutants can form highly corrosive acid solution. So
proper construction materials are very important and
wet-dry interface areas can also result in corrosion.
High power requirements: The high collection
efficiencies for particulate matter are attainable only at
high pressure drops which results in high operating
costs.
Water-disposal problems: The settling ponds or
sludge clarifier is needed to meet waste-water
regulation meter.
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