Furnace Technology
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

750
1050
1250
350

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

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

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