Furnace Technology
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

Preheating the combustion air
Oxygen enrichment of combustion air
Preheating the fuel gas
Increasing the draft in the furnace

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Furnace Technology
The amount of combustible escaping uncon-sumed from the furnace, depends upon the

All of these
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
Air supplied and furnace temperature
Burner design (thoroughness of mixing versus stratification)

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