Fuels and Combustion
Preheating of __________ the flame temperature.

Combustion air decreases
The gaseous fuel before combustion decreases
Either the fuel or the air or both, increases
Either the fuel or the air does not affect

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Fuels and Combustion
Combustion of pulverised fuel

All of these
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Requires larger combustion chamber than rich gaseous fuel
Suppresses the discharge of fine dust and grit into atmosphere

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