Furnace Technology
Advantages of use of preheated combustion air are

Saving in fuel consumption
Reduction in scale losses
Increase in flame temperature
All of these

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

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

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