Furnace Technology
Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of

Blast furnace gas with oxygen
Furnace oil with oxygen
Blast furnace gas with air
Furnace oil with air

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Furnace Technology
Turn down ratio of a burner

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

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