Flue gas
Context: Flue Gas Desulphurisation (FGD) units are pollution control systems used in coal-fired thermal power plants to remove sulphur dioxide (SO2) from flue gases, reducing harmful emissions that contribute to respiratory problems and environmental damage, but their high installation costs and implementation challenges have led to calls for policy reconsideration in India.
Important Pointers:
Flue Gas: Flue gas, also known as exhaust gas or stack gas, is the gas released from combustion plants as a by-product of burning fossil fuels.
Composition: It contains a mixture of gases including carbon monoxide (CO), carbon dioxide (CO₂), water vapor (H₂O), nitrogen oxides (NO and NO₂), sulfur dioxide (SO₂), trace pollutants, and particulate matter.
Origin of Name: The term 'flue gas' comes from the gas escaping through long pipes, chimneys, or ducts called ‘flues’.
Fuel Dependency: The exact composition of flue gas depends on the type of fuel used and combustion conditions.
Pollutant Concern: Flue gas often contains pollutants that must be treated or removed before being released into the atmosphere.
Flue Gas Analysis (FGA): FGA is crucial for assessing combustion efficiency, environmental compliance, and operational safety.
Air-to-Fuel Ratio: Optimal air-to-fuel ratios improve energy output and reduce emissions and particulate matter.
Burner Efficiency: Regular analysis helps improve burner efficiency in boilers and furnaces, lowering fuel consumption and costs.
Pollutant Monitoring: Tracking levels of nitrogen oxides (NOx) and sulfur dioxide (SO₂) is vital for meeting environmental regulations and preventing equipment damage.