Furnace Technology
In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?

Recuperator
Waste heat boiler
Regenerator
None of these

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Furnace Technology
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of pulverised solid fuels
Imperfect mixing of fuel & air and infiltration of air
Use of excessive positive draft in the furnace
Use of non-preheated combustion air

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