Furnace Technology
The main function of a muffle in the muffle furnace is to

Smooth out temperature inequalities on the combustion side of the muffle wall
Both A & B
Protect the charge from the effects of the products of combustion
Neither A nor B

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Furnace Technology
Recuperator is

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

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