Table of Contents
Thermal power plants are significant sources of air pollution, releasing pollutants such as sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter. Implementing emission control technologies is essential to reduce environmental impact. This article highlights real-world examples of emission control measures and the engineering solutions employed in various thermal power plants.
Flue Gas Desulfurization (FGD) Systems
Many power plants utilize FGD systems to remove SO2 from flue gases. These systems often use limestone or lime scrubbers to chemically react with sulfur dioxide, forming gypsum or other by-products. An example is the plant in Gujarat, India, which installed a wet FGD system, achieving over 90% SO2 removal efficiency.
Selective Catalytic Reduction (SCR) for NOx Control
SCR technology is widely adopted to reduce nitrogen oxides emissions. It involves injecting ammonia or urea into the flue gas and passing it over a catalyst to convert NOx into nitrogen and water. The plant in Taiwan successfully implemented SCR, reducing NOx emissions by approximately 80%.
Electrostatic Precipitators (ESPs)
Electrostatic precipitators are used to control particulate matter emissions. They charge particles in the flue gas and collect them on oppositely charged plates. A coal-fired power plant in South Africa installed ESPs, resulting in particulate emissions well below regulatory limits.
Innovative Engineering Solutions
Some plants adopt integrated approaches combining multiple technologies. For example, a power station in China employs FGD, SCR, and ESPs simultaneously to meet strict emission standards. Advances in flue gas cleaning and process optimization continue to improve emission control efficiency.