Fuels and Combustion
Stack heat losses can be minimised by

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

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Fuels and Combustion
Washing of coal

All of these
Controls its ash fusibility and increases its calorific value
Reduces its sulphur and ash content
Improves its coking properties

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