Furnace Technology
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Low reactivity of carbonised residue containing high proportion of iron & sulphur
Thick firebed and preheated primary air
Low forced draft & fuel bed temperature
All of these

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Furnace Technology
Turn down ratio of a burner

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

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