含硫油品储罐自燃灾源温度场的数值模拟

目前在役储罐的温度场难以准确的描述,对安全作业造成隐患。基于国内外储罐自燃机理研究,建立了含自燃灾源的储罐物理模型和数学模型,利用ANSYS有限元平台分析了自燃灾源、保温层厚度、环境温度及空气对流系数对含硫油品储罐温度场的影响.数值模拟结果表明,随着自燃灾源的持续氧化,外壁温度场异常区域逐渐明显;增加保温层厚度,外壁异常区域温差减小的趋势由大变小,当厚度达到30mm时,最大温差降至0.4℃;升高环境温度,外壁异常区域温差均匀降低,当环境温度达到35℃时,外壁温度基本趋于环境温度;增加空气对流系数,外壁异常区域温差快速减小,当空气对流系数达到100W/(m·℃)时,外壁温度接近环境温度,且外壁温差基本趋于一致.

Numerical simulation of temperature field of spontaneous combustion disaster sources for oil tanks containing sulfur

The temperature field of the storage tanks in service is difficult to accurately describe, which will cause potential safety hazard. In this paper the physical and mathematical model of a storage tank containing the spontaneous combustion accident source were established, based on the research of spontaneous combustion mechanism at home and abroad. The effect of the thickness of the insulation layer, the environment temperature and the air convection coefficient on temperature field was studied based on the ANSYS finite element analysis. The simulation results show that the anomaly area become obvious gradually with continuous oxidization of the spontaneous combustion accident source. Temperature of the outer wall decreases with the insulation layer thickness increasing. The maximum temperature difference decreases to 0.4 ℃ when the thickness increases to 30 mm. As the environment temperature increases gradually, temperature difference of the outer wall decreases evenly. When temperature reaches 35 ℃, the surface temperature of storage tanks tend to the environment temperature. Temperature difference of the outer wall decreases sharply with increasing of the air convection coefficient. When the air convection coefficient reaches 100 W/（m · ℃）, temperature of the outer wall is closed to the environment temperature and the surface temperature curve is basically consistent.