Furnace Technology
Turn down ratio of a burner

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
Is the ratio of maximum to minimum permissible heat input rates

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Furnace Technology
Which is not accomplished in an underfired furnace?

Elimination of cold spot at the bottom of the charge
Increase in heating capacity/m² of floor space
Reduction in the temperature of furnace gases
Portection of the periphery of the charge from excessive radiation

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