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
Reduction in the temperature of furnace gases
Increase in heating capacity/m² of floor space

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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
Development of hot spots in the fuel bed and an abnormally high rate of gasification
All of these

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