Furnace Technology
Which of the following furnaces will have maximum thermal efficiency?

Boiler furnace
Rotary kilns
Soaking pits
Walking beam reheating furnace

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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
Use of pulverised solid fuels
Imperfect mixing of fuel & air and infiltration of air
Use of non-preheated combustion air

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