Air for combustion
divided into four types depending
upon its role and the design of the particular burner.
Air will be referenced in this manual and seminar as primary,
and dilution air.
air provides a percentage of the combustion air, but more
importantly, controls the amount of fuel that can be burned.
improves combustion efficiency by promoting the fuel to burn completely.
Power burners generally do not require secondary air.
However, air leaking in through access/clean out doors, burner
mounting flanges, boiler sections, etc., dilutes the flame and flue gas
temperatures, reducing operating efficiencies as well as our ability to
accurately monitor combustion conditions.
air is supplied to
the combustion process to ensure each fuel molecule is completely surrounded
by sufficient combustion air. As
a burner tune-up improves the rate at which mixing occurs, the amount of
excess air required can be reduced.
air does not
participate directly in the combustion process and is primarily required to
attempt to control stack draft and reduce the likelihood that moisture in
the flue gases will condense in the vent system which directly influences
combustion air intake, safety and efficiency.