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

44119
45-50
25-30
65-70

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Furnace Technology
The reason for excessive clinker formation in gas producers is the

Development of hot spots in the fuel bed and an abnormally high rate of gasification
Use of coal/coke containing a high % of fines and ash
Use of fuel having too low an ash fusion temperature
All of these

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