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Air pollution control at the end of process at emission point in industries and
vehicle often demand air pollution control equipment followed by flue-gas stack
(smoke stack, chimney stack or simply referred as stack). The air pollution equipment selection and design depend on the following (Chandrappa and
Kulshrestha 2016):
1. Abrasiveness, conductivity, corrosivity, density, flash point, humidity, particulate shape, particle size distribution, pressure, resistivity, temperature, volumetric flow rate, viscosity, reactivity, toxicity and vapour point of air stream
2. Aesthetic considerations
3. Ambient conditions
4. Available space
5. Concentration of pollutants
6. Contribution of air pollution control system to wastewater and land pollution
7. Equipment location
8. Physical and chemical properties of pollutants
9. Quantity of emissions
10. Statutory requirements
Stack is provided for easy dispersion of air pollutants at a height where the emissions would not harm the people on the ground. The height of the stack varies from
few meters to several hundred of meters above the roof of emission emitting source.
Sources of higher emission such as thermal power plant and atomic power plant
would require chimney as high as 250 m (Fig. 6.3).
What feeds into chimney is important apart from the chimney height. Poor maintenance of air pollution equipment and induction draft (ID) fan (Fig. 6.4) can hardly
contribute to objection of pollution reduction at ground level by dispersion.
Conventional air pollution equipment for controlling particulate matter from stationary sources include:
Fig. 6.2 Water sprinkling
in a mining area
6.2 Engineering Control
Air pollution control at the end of process at emission point in industries and
vehicle often demand air pollution control equipment followed by flue-gas stack
(smoke stack, chimney stack or simply referred as stack). The air pollution equipment selection and design depend on the following (Chandrappa and
Kulshrestha 2016):
1. Abrasiveness, conductivity, corrosivity, density, flash point, humidity, particulate shape, particle size distribution, pressure, resistivity, temperature, volumetric flow rate, viscosity, reactivity, toxicity and vapour point of air stream
2. Aesthetic considerations
3. Ambient conditions
4. Available space
5. Concentration of pollutants
6. Contribution of air pollution control system to wastewater and land pollution
7. Equipment location
8. Physical and chemical properties of pollutants
9. Quantity of emissions
10. Statutory requirements
Stack is provided for easy dispersion of air pollutants at a height where the emissions would not harm the people on the ground. The height of the stack varies from
few meters to several hundred of meters above the roof of emission emitting source.
Sources of higher emission such as thermal power plant and atomic power plant
would require chimney as high as 250 m (Fig. 6.3).
What feeds into chimney is important apart from the chimney height. Poor maintenance of air pollution equipment and induction draft (ID) fan (Fig. 6.4) can hardly
contribute to objection of pollution reduction at ground level by dispersion.
Conventional air pollution equipment for controlling particulate matter from stationary sources include:
Fig. 6.2 Water sprinkling
in a mining area
6.2 Engineering Control