Component

Heat Value (Kcal)

Sponge iron sensible heat; assuming ∆t = 1045˚C

+124

Char sensible heat; assuming ∆t = 1045˚C

+13

Flue gas sensible heat; assuming ∆t = 1045˚C

+1555

Heat loss due to moisture present in the coal

+66

Heat loss due to vapor formed from hydrogen of coal

+49

Heat of iron reduction reaction (exothermic)

−758

Heat gain from burning of VM of coal

−1300

Net heat surplus in overall Kiln reaction

−251

Total additional heat/coal requirement to produce 1 Kg sponge iron

nil