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Flu-Gas Desulfurization (FGD) is a set of technologies used to remove sulphur-dioxide (SO2) from exhaust flue gases of fossil-fuel power plants. Why is this process important?
1.Plants with FGD earn progressive carbon credits because the exhaust gas after FGD does not contain any pollutants.
2.SO2 emissions are a primary contributor to acid rain and are being regulated in India.
Which of the above is/are correct?
1 only
2 only
Both 1 and 2
None
Flue Gases is mixture of gases produced by combustion of fuel and other materials in power stations and various industrial plants and released via flu (ducts) in atmosphere. It largely contains oxides of nitrogen derived from combustion of air, sulphur oxides, carbon dioxide, carbon monoxide, water vapour, excess oxygen, particulate matter like soot. Justification: Statement 1: It does not remove all the pollutants. For a typical coal-fired power station, FGD system may remove 90% or more of the SO2 in the flue gases. Others may remain so. Learning: Common methods used in FGD are wet scrubbing method, Wet and Dry lime scrubbing method, Spray-dry scrubbing method, SNOX method, Dry sorbent injection method, etc. The practice of FGD is in line with major environmental regulations in India and abroad.
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