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

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

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Furnace Technology
Turn down ratio of a burner

Should be 1:1 for a batch type furnace.
Is the ratio of maximum to minimum permissible heat input rates
Should be as low as possible i.e., 1 : 2
Is normally much more for a continuous furnace as compared to a batch furnace

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