Fuels and Combustion
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

Increase
Decrease
Not change
Increase or decrease depending on the fuel type

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Fuels and Combustion
Combustion of pulverised fuel

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

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Fuels and Combustion
Producer gas containing least amount of tar is produced by the

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
High pressure gasification of coal (e.g. in Lurgi gasifier)
Partial combustion of coal
Partial combustion of large size (< 50 mm) coke

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