What does "flue gas" refer to?

Flue gas refers specifically to the exhaust gases generated as a byproduct of the combustion process within a boiler. When fuel (such as natural gas, oil, or coal) is burned, it reacts with oxygen to produce energy, and this chemical reaction releases various gases. The primary components of flue gas typically include carbon dioxide (CO2), water vapor (H2O), nitrogen (N2), and smaller amounts of other substances, depending on the fuel used and the combustion conditions.

Understanding flue gas is crucial in power engineering, as it not only represents the emissions that must be managed to comply with environmental regulations, but also affects the efficiency of the combustion process. Proper management of flue gases can lead to better energy recovery systems and improved overall boiler performance.