Furnace Technology
Fuel economy in an industrial furnace operation can not be achieved by the use of

Recupterators
Stoichiometric combustion air
Non-preheated combustion air
Combustion air not enriched with oxygen

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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 fuel having too low an ash fusion temperature
All of these
Use of coal/coke containing a high % of fines and ash

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