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

heated sufficiently

burnt in excess air

heated to its ignition point

burnt as powder