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



Related Terms

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.

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.

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.

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.

INTERCOOLED CYCLE

A gas turbine employing two compressors, the compressed air from the first compressor is cooled before being discharged into a second compressor.

ATMOSPHERIC BURNER

A gas burner in which all air for combustion is supplied by natural draft, the inspiriting force being created by gas velocity.

UPPER EXPLOSIVE LIMIT

UEL - the concentration of hydrocarbon gas in air above which combustion cannot take place.

DUCT

A passage for air or gas flow.

AERATION TANK

A fluid-holding tank with provisions to aerate its contents by bubbling air or another gas through the liquid or by spraying the liquid into the air.

PURGE INTERLOCK

A device so arranged that an air flow to the furnace above a minimum must exist for a definite time interval before the interlocking system will permit an automatic ignition torch to be placed in operation.

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