Furnace Technology
Oxygen enrichment of combustion air does not result in increase of the

Oxygen in the flue gas
Stack loss
Heat transfer rate in the furnace
Flame temperature

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

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