Furnace Technology
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.

65-70
44119
45-50
25-30

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Furnace Technology
Recuperator is

An intermittant waste heat recovery equipment
Not used for fuel gas preheating
A continuous waste heat recovery equipment
Heavier than regenerator meant for the same duty

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