133
Table 6.1 (continued)
Type of
control
equipment
Types of
pollutants
removed
Examples of
pollutants
Control
efficiency
Device
considerations
and restrictions
Common
applications
Bag filters PM
Dust, cement,
fine powders,
abrasives
99.99% (even
for fine
particulates)
Abrasion,
corrosive
chemicals,
high
temperatures
(>290 °C) can
damage fabric
of bag
Shot blasting,
sand blasting,
cement packing
Cartridge
dust
collectors
PM
Dust, smoke,
fumes
99.99+%
Required
periodic
cleaning.
Filtration
media is
affected by
high humidity
Fabrication,
machining, and
finishing shops
Cyclone
separators
PM ≥10–
20 μm
Dust, ash,
fragments of
material
90% (for
particulates
≥10–20 μm
in diameter,
depending on
the equipment
design,
operating
conditions)
Not suitable
for
PM <10 μm.
Capable of
operation at
high gas
stream
temperatures
Metallurgical
plants, cement
manufacturing
ESP
PM
Dust, smoke,
fumes (for wet
ESPs)
99+% (for
particulates
≥1.0 μm in
diameter
depending on
the equipment
design,
operating
conditions)
Required high
investment and
safety
precaution
Power plants,
cement
manufacturing,
metallurgical
plants
Incinerators –
–
Thermal
oxidizers
Gaseous
compounds;
PM
VOCs
99.99% (for
VOCs,
99.99+%)
Halogen or
sulphur
compounds in
stream can
result in
formation of
corrosive gases
Oil and gas
refineries
Catalytic
oxidizers
Gaseous
compounds;
PM
VOCs
99.99%
Catalyst
contamination
will lead to
efficiency
reduction
Oil and gas
refineries
(continued)
6.2 Engineering Control