Furnace Technology
Recuperator is

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

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

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
Use of coal/coke containing a high % of fines and ash

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