Question

Name the two harmless gas is released by thermal power plants or smelters?

Answer 1

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➡️. the two harmless gases which are released by thermal power plants or smelters are given below :

❤. nitrogen

❤. oxygen

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Answer 2

Burning Coal in a power plant produces a number of pollutants. Some of these pollutants are specific to the type of fuel or is part of the combustion process or related to the design and configuration of the plant. This article highlights the major pollutants discharged from the power plant.

Carbon Dioxide (CO2)

CO2 was thought of as a product of combustion and not as a pollutant. Kyoto protocol, effects of Green House gases and global warming issues have changed the way we look at CO2. CO2 has turned to be the major greenhouse gas. A fossil fuel power plant is the major contributor of CO2.

One MJ of heat input produces 0.1 kg of CO2. The only way to eliminate CO2 is to capture it before leaving to atmosphere. After capturing it has to be stored permanently or sequestered. Commercially viable capture and sequestration systems are yet to be in place. Till such time the only way is to

Improve the power plant efficiency so that the reduced coal consumption reduces CO2 per kwhr.

Switch over from Fossil based energy sources to renewable sources like wind, solar or hydro power.

Reduce Deforestation and increase Afforestation to absorb the excess CO2 produced.

Sulphur Dioxide (SO2)

This is a product of Combustion and depends on the amount of Sulfur in Coal.This is also referred to as SOx.

Sulphur in Coal ranges for 0.1 % to 3.5% depending on type and rank. During combustion Sulfur combines with Oxygen to form SO2.

Power plants are the largest emitters of SO2. In the presence of other gases SO2 forms Sulphuric acid and can precipitate down as acid rain leading to destruction of eco systems.

Use of low Sulfur coals is the best ways to reduce the SO2 emissions. Desulphurisation plants downstream of the boilers also reduce emissions. Fluidized bed combustion of coal is another effective method to reduce SO2 emissions..