针对带有缺陷的炉膛试件的内部传热建立了三维物理和数学模型，运用有限体积法研究了 在不同方位进行缺陷检测时的表面温度分布及红外特征。计算分析表明，耐火砖在炉膛保温效果方面起到主要作用。 当耐火砖出现故障时，外表面温度出现异常，缺陷处的最高温度与正常工作时的温差随缺陷深度的增加近似呈指数关系。

Three-dimensional physical and mathematic models are established for the internal heat transfer in a defective furnace. The temperature distribution and infrared characteristics of the surface when the defect in a furnace is detected in different positions are studied. The analysis result shows that the firebricks play a major role in the thermal insulation of the furnace. When the firebricks break down, the temperature of the outer surface of the furnace is abnormal. In the position of the defect, the difference between the maximum temperature and the normal operation temperature increases exponentially with the defect depth.