Factors affecting Fuel Rate

1.Gas Utilization   

2.Hot Blast Temperature 

3.Sinter %  

4.Steam Enrichment  

5.Heat loss 

6.Flux Rate  

7.Coke ash  

8.Coal ash

9.Coal RR

10.Slag Rate

11.Fines carryover

12.Metalloids Mn, Ti, P, Si

Fe in Burden

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