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

All of these
Use of fuel having too low an ash fusion temperature
Use of coal/coke containing a high % of fines and ash
Development of hot spots in the fuel bed and an abnormally high rate of gasification

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Furnace Technology
Which is not accomplished in an underfired furnace?

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

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