Furnace Technology
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.

Underfired
Covered
Sidefired
Recirculating

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

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