CHE ENGG.

1. INDUSTRIAL AIR
POLLUTION CONTROL
EQUIPMENTS
SUBMITTED BY:
ANUPAM VERMA
CSJMA14001390191
CHEMICAL ENGINEERING
BATCH 2K14
University Institute of Engineering Technology
SUBMITTED TO:
Dr. BRISHTI MITRA
HOD(CHEMICAL
ENGINEERING)

2. Contents
• AIR POLLUTION
• EFFECTS OF AIR POLLUTION
• AIR POLLUTION CONTROL EQUIPMENTS
• PARTICLE POLLUTANT CONTROL
DEVICES
• GASES POLLUTANT CONTROL DEVICES
• REFERENCES
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3. AIR POLLUTION
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4. EFFECTS OF AIR POLLUTION
• HUMAN HEALTH
• GREEN HOUSE EFFECT & GLOBAL
WARMING
• ACID RAIN
• DEPLETION OF OZONE LAYER
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6. EQUIPMENT FOR AIR POLLUTION
CONTROL
PARTICULATE
Settling chamber
Cyclones
Electrostatic Precipitators
GASES
Absorption
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7. Used to remove particles with size
greater than 50 μm.
Velocity of flue gas reduced in large
chamber.
Particles settle under gravitational force.
Gravitational settling chamber
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8. D= [18Vhμ/ Lg(ρp- ρ)]1/2
D = is minimum size of particle that can be
removed in a settling chamber
V= horizontal velocity of carrier gas
g= acceleration due to gravity
ρp= density of particle
ρ = density of gas
μ= viscosity of gas
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9. Application
Used widely for removal of large solid
particulates from draft furnace, kilns.
Sometimes used in process industry, food and
metallurgical industry.
Used as pre-cleaners for high
efficiency collectors.
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10. Cyclone separator
Centrifugal force is utilized to separate the
particulate matter.
It can remove 10 to 50 μm particle size.
Used mostly in industries.
Cyclone efficiencies > 90 % with particle
dia of 10 μ
> 95 % with particle dia 20 μ.
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12. Dp, min= [9 μ B/ π V Nt(ρp- ρ)] ½
Dp, min= dia of smallest particles that can be
removed cm
μ = viscosity of the fluid
B= width of cyclone inlet duct
V= avg. inlet velocity
Nt= no of turns made by gas stream in cyclone
ρ p = density of particles
ρ = density of fluid
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13. Applications
Control gas borne particulate matter in industrial
operation such as cement manufacture, mineral
processing and textile industries.
Used in recovery of catalyst ducts in petroleum
industry and reduction of fly ash emission.
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14. Electrostatic precipitators
Works on the principle of electrical charging
of particulate Matter (-ve) and collecting it in a
(+ve) charged surface.
99% efficiency.
Can remove particle size range of 0.1 μm to
1μm.
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16. Application
Cement factories-cleaning the flue gases and
recovery of cement dust from kiln
Steel plants-cleaning blast furnace gases to use it
as fuel
Chemical industry-cleaning various type of gas
such as CO2 and SO2
Petroleum industry-recovery of catalytic duct
Electric power industry-collecting fly ash from
Coal fired boiler
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17. Absorption
Effluent gas passed through absorbers
which contain liquid absorbent.
Efficiency depends on
1. Amount of surface contact between gas and liquid
2. Contact time
3. Conc. of absorbing medium
4. Speed of reaction between the absorbent and gases
Absorbents used to remove SO2, H2S, SO3, HF
and oxides of nitrogen.
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18. Gaseous
pollutants
Common absorbents used in solution form
SO2 Dimethylaniline, ammonium sulphite,
ammonium sulphate, sodium sulphide, calcium
sulphite, alkaline water,
H2S NaOH and phenol mix (3:2), tripottasium
phosphate, sodium alamine, soda ash
HF Water, NaOH
NOX Water, aqueous nitric acid
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19. References
•http://www.eng.utoledo.edu/aprg/courses/iap/text/part_
ctrl1.html
•http://nptel.ac.in/courses/103107084/module2/lecture2/
lecture2.pdf
•http://www.ajer.org/papers/v5(04)/O050401300134.pdf
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