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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Furnace Technology
Recuperator is

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

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