Numerical Analysis of Blast Furnace with Injection of COREX Export Gas After Removal of CO₂

Abstract

Blast furnace (BF) injection of COREX export gas after removal of CO₂ (CEG) displays many ecological and environmental advantages. A static model of BF operation of CEG was developed according to mass and heat balance. The effect of CEG injection on the raceway adiabatic flame temperature (RAFT), the amount and composition of bosh gas, and the shape of raceway were studied. The acceptable injection volume of CEG under different thermal compensation measures was investigated. The results show that under no thermal compensation, with the increase of CEG injection, the RAFT decreases but the volume of bosh gas increases. The content of CO and H₂ increases with the increase of CEG injection. Based on the standard of maintaining the RAFT and volume of bosh gas, addition of oxygen, reducing blast humidity and increasing blast temperature are effective measures of thermal compensation to increase the quantity of CEG injection. The characteristics of high temperature zone of BF under different suitable CEG injection volumes were also studied. The findings of this work can be used as a theoretical basis to guide plant operations for CEG injection in BF.