What type of heat absorption regulation does flue gas recirculation provide?

Flue gas recirculation reduces heat absorption in a combustion system by returning a portion of the flue gases back into the combustion chamber. This process effectively lowers the temperature of the combustion process and reduces the formation of nitrogen oxides (NOx), which are polluting byproducts of high-temperature combustion.

By introducing the cooler, previously burned gases into the combustion process, the overall temperature is moderated, thereby limiting excessive heat absorption. This temperature control not only aids in emissions reduction but also helps prevent damage to the boiler and other components due to overheating.

Other options might imply enhancements or maintenance of heat absorption that misrepresent the purpose and function of flue gas recirculation. The primary goal is to manage the combustion environment for efficiency and emissions control, underscoring why reducing heat absorption is the correct characterization of flue gas recirculation's effect.