Numerical simulation of blast furnace raceway with coke oven gas injection

A raceway mathematical model of blast furnace with coke oven gas (COG) injection was established based on the theory of mass and heat balances. The effects of COG injection volume on the coke mass flow rate, theoretical flame temperature, bosh gas volume, bosh gas compositions and raceway shape were investigated systemically. The results showed that the theoretical flame temperature tends to decreasing and bosh gas volume tends to increasing, when COG injection volume increasing with the benchmark operation of blast furnace unchanged. The theoretical flame temperature and bosh gas volume can be constant by decreasing blast volume and increasing oxygen enrichment when blast furnace operating with coke oven gas injection. After thermal compensation, with increasing COG injection volume, the coke mass flow rate and reducing gas volume in bosh gas tend to increasing, and the raceway cubic capacity tends to narrowing. With 1 m3/s increasing of COG injection, the coke mass flow rate increases by 1.74%, the reducing gas volume in bosh gas increases by 2.04% and the raceway cubic capacity decreases by 1.98%.