Furnace Technology
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

Quantity & temperature of waste gas
Corrosive nature of the waste gas
All of these
Dust concentration & nature of dust in waste gas

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Furnace Technology
Turn down ratio of a burner

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

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