provide air around burners for obtaining optimum combustion

transport and dry the coal

convert CO (formed in lower zone of furnace) into C02 at higher zone

air delivered by induced draft fan

the content of sulphur

the content of ash and heating value

the proximate analysis

the exact analysis

high calorific value

produce minimum smoke and gases

ease in storing

high ignition point

causing clinkering and slagging

corroding air heaters

spontaneous combustion during coal storage

all of the above.

form lumps or masses of coke

burn freely

show little or no fusing action

burn completely