What happens to Fuel carbon in BF?

•Input fuel

–Coke + Nut  420 kg/thm (from top)

–Coal  120 kg/thm (through tuyeres)

»102 kg/thm coke equivalent

–Total coke equivalent 522 kg/thm

•Out put

–In HM as carburization 4.5% say  52 kg/thm coke equivalent

•Remaining 470 kg/thm will be used in direct reduction and will burn in front of tuyeres.

•Now assume 30% DR

–The coke used in DR = 141 kg/thm

–Remaining 329 kg/thm will be burnt in front of tuyeres

–Out of which coal 120 kg/thm = 102 kg coke equivalent

–And the coke burnt in front of tuyeres = 227 kg/thm