Fuels and Combustion
Stack heat losses can be minimised by

Controlling the excess air
Using low c.v. fuels
Maintaining proper draft in the furnace
Oxygen enrichment of combustion air

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Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Enhanced sensible heat loss in the flue gas
High exit flue gas temperature from the furnace
Intermittant and uncontrolled combustion of the fuel
Excessive power requirement of air blower

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