Control of Air Pollution

Control of air pollution

1) Particulate control

I. Mechanical collectors (dust cyclones, multicyclones)

II. Electrostatic precipitators

An electrostatic precipitator (ESP) or electrostatic air cleaner is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge.

2) Bag houses

Designed to handle heavy dust loads, a dust collector consists of a blower, dust filter, a filter-cleaning system, and a dust receptacle or dust removal system (distinguished from air cleaners which utilize disposable filters to remove the dust).

3) Particulate scrubbers

Wet scrubber is a form of pollution control technology. The term describes a variety of devices that use pollutants from a furnace flue gas or from other gas streams. In a wet scrubber, the polluted gas stream is brought into contact with the scrubbing liquid, by spraying it with the liquid, by forcing it through a pool of liquid, or by some other contact method, so as to remove the pollutants.

4) Scrubbers

1. Baffle spray scrubber
2. Cyclonic spray scrubber
3. Ejector venture scrubber
4. Mechanically aided scrubber
5. Spray tower
6. Wet scrubber

5) NOx control

1. Low NOx burners
2. Selective catalytic reduction (SCR)
3. Selective non-catalytic reduction (SNCR)
4. NOx scrubbers
5. Exhaust gas recirculation
6. Catalytic converter (also for VOC control)

6) VOC abatement

1. Adsorption systems, such as activated carbon
2. Flares
3. Thermal oxidizers
4. Catalytic oxidizers
5. Bio filters
6. Absorption (scrubbing)
7. Cryogenic condensers
8. Vapor recovery systems

7) Acid Gas/SO₂ control

1. Wet scrubbers
2. Dry scrubbers
3. Flue gas desulfurization

8) Mercury control

I. Sorbent Injection Technology

II. Electro-Catalytic Oxidation (ECO)

III. K-Fuel