Furnace Technology
Recuperator is

A continuous waste heat recovery equipment
Not used for fuel gas preheating
Heavier than regenerator meant for the same duty
An intermittant waste heat recovery equipment

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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)
Burner design (thoroughness of mixing versus stratification)
Air supplied and furnace temperature

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