Furnace Technology
Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an

Steam superheater
All of these
Air preheater
Economiser

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

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

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