8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

A multi-coupled three-dimensional transient model is proposed for simulation of blast-furnace (BF) iron-making processes. The model couples the whole thermo-fluid flow regions in the BF internal, including shaft, belly, hearth and raceway. Furthermore, the internal fluid flow, heat/mass transfer process is coupled with the heat transfer taking place in the outside refractory walls enclosing the BF internal fluid domain. The coupled simulation of processes in BF upper, middle and bottom parts, and fluid-solid conjugate heat transfer approach adopted in this model allows one to avoid applying artificial boundary conditions between different regions of the BF. The model is validated against the temperature measurements by the embedded thermal-couples, and the cross-sectional temperature measurement at the BF throat. Very good agreement is achieved for temperature at thermal-couple sampling locations, between the measured and calculated temperatures. The model is capable of predicting transient behaviour of BF processes, such as non-uniform descending velocity of burden, time-varying distribution of different burden materials (coke, pellet, ore and sinter), distribution of porosity, cohesive zone. Distributions of temperature, pressure, velocity and volume fractions of gas mixture, solid particles, liquid iron and slag. The model is applied for detailed analysis of BaoSteel’s No. 2 BF in the Baoshan base, Shanghai.