Burner Operating Principles
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nominal 550,000 BTU/foot
wide-range flame modulation
clean-burning natural gas or propane
all air for burner operation is introduced from outdoors
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Burner Operating Principles
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Fuel gas is fed directly into the make-up air burner. The air stream's
kinetic energy furnishes combustion air. It functions properly at the velocity and
pressures associated with usual ventilating systems.
The burner operation: the combination of velocity impact and suction
generated by the combustion-baffles shape induces air through the ports
into the combustion zone. The air supply is constant, though only mixes
with the gas flowing into the burner ports. When a very small quantity of
gas is admitted to the burner, sufficient air to gas mixing takes place
in the low-fire slot within the burner casting. Combustion takes place
in this zone. Since the burner casting contains the low-fire zone, the
casting shields the flame from uncontrolled air entry.
Increasing gas supply moves the flame out to the intermediate fire zone
for additional air. At full capacity, mixing occurs at the larger air
ports of the high-fire zone, enhanced by air spilling over the end of the
baffles. Reducing the gas supply reverses the sequence - flame recedes to the
air-supply location until the low-fire zone is reached.
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