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To burn oil the temperature must be raised to vaporisation temperature, this can not be done in heaters due to gassing but is done by radiant heat in the flame. The lighter hydrocarbons in the atomised spray are rapidly heated and burnt in the primary flame. The heavier fractions pass through this achieving their vaporisation temperature. The primary flame is essential to good combustion. By design the primary flame exists where it receives maximum reflected heat from the shape of the quarl. The size of the primary flame ( shown smaller than actual in drawing) just fills the quarl space. Too large and impingement leads to carbon deposits building up. Too small unheated secondary air reduces combustion efficiency. The tip plate creates vortices reducing the mixing time for the air/fuel and reduces the forward speed of the flame.

Related Terms

ABMA

American Boiler Manufacturers Association.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

ASME SECTION VII SUBSECTION C6

Operation of boiler auxiliaries.

ASME SECTION VII SUBSECTION C4

Prevention of direct causes of boiler failure.

ASME SECTION VII SUBSECTION C2

Operating and maintaining boiler appliances.

CONDENSATE POLISHER

A device used to clean the returning condensate to the boiler feedwater system.

CALCIUM

A scale forming element found in boiler feed water.

PRIMARY AIR

Air introduced with fuel at the burners.

DE-CARBONATION

Refers to the removal of carbon dioxide from the boiler feedwater.

SECONDARY COMBUSTION

Combustion which occurs as a result of ignition at a point beyond the furnace.
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