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

various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

fuel constituents as percent by volume of moisture, volatile, fixed carbon and ash

fuel constituents as percent by weight of moisture, volatile, fixed carbon and ash