Furnace Technology
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of

Thoria
Graphite powder
Beryllium
Zircon powder

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Furnace Technology
Recuperator is

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

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