Furnace Technology
Which is not accomplished in an underfired furnace?

Elimination of cold spot at the bottom of the charge
Portection of the periphery of the charge from excessive radiation
Increase in heating capacity/m² of floor space
Reduction in the temperature of furnace gases

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

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