气孔对镁铝尖晶石耐火材料的温度场和热应力场的影响模拟

Simulation of Porosity Effect on Temperature Field and Thermal Stress Field of Magnesia Alumina Spinel Refractory

为研究气孔对镁铝尖晶石耐火材料温度场和热应力场的影响,设计气孔率分别为23%、30%、40%,气孔直径分别为0.023、0.041、0.054 mm的9种模型,采用Ansys分析软件计算温度分布云图、温度梯度分布云图和热应力分布云图。结果表明:随气孔直径增大或气孔率的增大,镁铝尖晶石的散热速度减小;当气孔率一定时,随气孔直径增大,镁铝尖晶石温度梯度减小,热应力减小;当气孔直径一定时,随气孔率增大,镁铝尖晶石温度梯度增大,热应力增大。

9porosity models,whose porosity ratios are23%,30%and40%,and porosity diameters are0.023mm,0.041mm,and0.054mm,respectively,were designed in order to study the porosity effect of the magnesium alumina spinel refractory on its temperature field andthermal stresses field.The temperature distribution,temperature gradient,and thermal stress were calculated by using Ansys analysis software.Results indicate that the heat dissipation rate of the spinel decreases with the increase of the porosity ratio or the increase of the pore diameter.When the porosity is constant,the temperature gradient and thermal stress of the spinel decrease with the increase of the pore diameter;whenthe pore diameter is constant,the temperature gradient and thermal stress of the spinel increase with the increase of the porosity ratio.