Furnace Technology
Circulation of gases in furnace is caused by the

All of these
Furnace pressure in conjunction with draft in flues
Change in volume during a change of temperature
Difference in density between hot and cold gases

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

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