2114 高炉内の気流とコークス粒子の運動の数値シミュレーション : 羽口角度の影響(G01-1 計算力学(1),G01 計算力学)

抄録

We have numerically simulated the particle and gas flows in the raceway region in a real blast furnace of which dimension is the same as that of Nippon Steel Co., Oita No.1 BF using Distinct Element Method for the computation of the multi body interaction among coke particles, Hard Sphere Model for two-body interaction of powder particles based on Direct Simulation of Monte-Carlo Method and Finite Difference Method for the numerical analysis of Navier-Stokes equations with the interaction terms between gas and particles for the gas flows. We have taken the existence of softening melting cohesive zones into account. In this study, we have examined the effects of tuyere angles on the flow stability in the raceway region. Calculated results indicate the raceway pattern, its fluctuations and its various periods. The results also indicate the velocity distributions of coke, powder and gas, and packing ratio distributions of these particles. The calculated data show that steady state raceway is formed at about seven degrees downward in the tuyere angle.