Furnace Technology
Tunnel kilns are usually used for

Melting of glass
Drying/tempering of refractories
Reheating of slabs
Roasting of pyrites

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Furnace Technology
Which is not accomplished in an underfired furnace?

Reduction in the temperature of furnace gases
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

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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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