矿热炉塌料事故CO扩散非稳态数值模拟

建立了铁合金车间自然通风三维k～ε模型,在动量方程中考虑浮力影响,利用Fluent软件模拟了车间内风流组织和矿热炉塌料事故下的CO非稳态扩散.结果表明:各呼吸面的风流结构可分为主流区、涡流区和停滞区,在烟囱附近存在涡流分布,在主流出口边壁处存在停滞区;分析了不同风向和风速下不同通风时刻CO的迁移过程和分布规律,CO浓度在主流卷吸作用下从涡流中心向周围逐渐降低;通过回归分析得到了通风时间跟风速呈指数下降关系,为铁合金车间通风设计提供理论依据和参考.

Unsteady-numerical Simulation of CO Diffusion in Submerged Arc Furnace during Collapse

Fluent software was used to simulate the wind flow state and CO diffusion in submerged arc furnace during collapse,where a three dimensional k ~ ε model was adopted,and the effect of buoyancy was taken into consideration.The simulation results show that wind flow for each respiratory surface can be divided into three zones,namely,mainstream zone,eddy zone and stagnation zone.Eddy zones appear at chimney sites while stagnation zones can be found at the wall of mainstream outlet.From the analysis of CO diffusion and distribution at different wind velocities and directions,it can be concluded that CO concentration decreases from eddy center to periphery driven by mainstream entrainment.Regression analysis shows that ventilation time decreases exponentially with wind speed increase.