Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Speed of combustion of fuel
Heat transfer rate to the stock in the furnace
Flame temperature achieved
Calorific value of the fuel

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Fuels and Combustion
Combustion of pulverised fuel

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

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