Furnace Technology
Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?

Excessive fly ash discharge from the stack
Ash disposal problem
Erosion of induced draft fan blades
Higher power consumption in its transportation

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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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