Furnace Technology
Thermal efficiency of furnaces can be improved by

All of these
Minimising heat losses from furnace walls
Maintaining proper draught
Waste heat recovery from flue gas

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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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