Furnace Technology
Fuel economy in an industrial furnace operation can not be achieved by the use of

Combustion air not enriched with oxygen
Stoichiometric combustion air
Recupterators
Non-preheated combustion air

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Furnace Technology
Recuperator is

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

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