Furnace Technology
The advantages of firing pulverised coal in the furnace lies in the fact that, it

Permits the use of high ash content coal
Permits the use of low fusion point ash coal
All of these
Accelerates the burning rate and economises on fuel consumption

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Furnace Technology
Turn down ratio of a burner

Should be 1:1 for a batch type furnace.
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 as low as possible i.e., 1 : 2

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