What type of air is introduced above the fuel bed for better combustion?

The introduction of secondary air above the fuel bed is crucial for enhancing combustion efficiency. Secondary air refers to the additional air supplied to the combustion process after the primary air has already been introduced. This secondary air plays a vital role in ensuring that the fuel burns more completely by providing the necessary oxygen required for combustion at the later stage of the fuel burning process.

When secondary air is introduced, it helps mix with the combustion gases, promoting more thorough mixing and enabling the combustion of any unburned fuel particles. This process not only improves the combustion efficiency but also reduces harmful emissions, as it assists in burning off pollutants that may otherwise escape unburned. In controlled environments, the proper management of secondary air can lead to better temperature regulation and heat distribution, contributing to a more efficient and cleaner combustion process overall.