Furnace Technology
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

Preheating the combustion air
Oxygen enrichment of combustion air
Preheating the fuel gas
Increasing the draft in the furnace

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Furnace Technology
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Thermal conductivity of the charge & structural materials of furnace
Nature of process ; whether batch, continuous or intermittant
Rate of firing and emissivity of flame
All of these

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