Lean combustible by-product gas resulting from burning coke with a deficiency of air in a blast furnace.



Related Terms

BLAST BURNER

A burner in which a controlled burst of air or oxygen under pressure is supplied to the illuminating gas used. Also known as blast lamp.

GLASS FURNACE

A large, covered furnace or tank for melting large batches of glass, in which heat is supplied by a flame playing over the glass surface, and regenerative heating of combustion air and gas is usually employed. Also known as glass tank.

EXPLOSIVE LIMITS

The upper and lower limits of percentage composition of a combustible gas mixed with other gases or air within which the mixture explodes when ignited.

NOx

Any combination of nitrogen and oxygen in a compound form. The most common in terms of environmental considerations is NO, which constitutes 90% of combustion NOx emissions, and NO2. All NO is eventually converted to NO2 in the atmosphere. Hence, most regulations are written to assume that the NOx which is emitted is in the form of NO2. Nox emissions are influenced by many factors, including furnace temperature, flame temperature, burner design, combustion air temperature, nitrogen content of liquid fuels, ammonia content of gas fuels, and other factors.

TRAMP AIR

Any air that enters (infiltrates) the furnace through leaks. This air may be measured by the O2 analyzer and often contributes to the burning of the fuel.

INCINERATION

The process of controlled burning to reduce combustible wastes to a non-combustible residue, carbon dioxide, and other gases.

GRAVITY TYPE FURNACE

A furnace where the heated air is circulated through the system by the force of gravity.

TERTIARY AIR

Air for combustion supplied to the furnace to supplement the primary and secondary air.

BALANCED DRAFT

The maintenance of a fixed value of draft in a furnace at all combustion rates by control of incoming air and outgoing products of combustion.

HORIZONTAL FIRING

The firing of fuel in a boiler furnace in which the burners discharge fuel and air into the furnace horizontally.

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