Question

Why is secondary air necessary in hand fired boilers?

a) Necessary to burn the combustible gases
b) if primary air should fail
c) used only if sulfur content is high

Answer 1

Secondary air is necessary in hand fired boilers for complete combustion, as well as to serve as a backup for primary air in case of failure.

Step-by-step explanation:

Secondary air is necessary in hand fired boilers for several reasons:

1. Burning combustible gases: Secondary air helps in the complete combustion of combustible gases that are released during the burning process. It provides additional oxygen to ensure thorough combustion and efficient heat transfer.
2. Backup for primary air: If the primary air supply should fail, secondary air can serve as a backup to maintain the combustion process. This ensures continuous heat generation and prevents shutdowns.

Therefore, secondary air is essential for achieving optimal combustion efficiency and maintaining the operation of hand fired boilers.