周期性边界条件下埋地热油管道传热影响因素的分析

Analysis of Factors affecting Heat Transfer of Buried Oil Pipeline With Periodic Boundary Conditions

建立土壤多孔介质模型,采用有限容积法对地表温度周期性波动条件下埋地热油管道非稳态传热过程进行数值计算。考虑了土壤中水相、气相迁移对管道传热的影响,对比分析了有、无保温层及保温层厚度、保温层导热系数、土壤导热系数、土壤含水率、管径、埋深等因素对埋地管道非稳态传热规律的影响。研究表明:保温层厚度、导热系数、土壤导热系数对埋地热油管道非稳态传热的影响相对较大。管径、埋深对管道传热的影响相对次之,且埋深对管道的影响冬季远要大于夏季,而土壤含水率对管道传热的影响相对较小。

The porous media model of soil was established,the finite volume method was used to calculate the buried hot oil pipeline unsteady heat transfer process under conditions of cyclical fluctuations of surface temperature.Soil water phase and gas transfer was taken into account in the heat transfer.Effects of insulation layer and insulation layer thickness,thermal conductivity of insulation layer,soil thermal conductivity,heat capacity of soil,soil moisture content,diameter,depth and other factors on non-steady state heat transfer of buried pipelines were discussed.The results show that： the relatively larger factors on unsteady heat transfer of buried oil pipeline are insulation layer thickness,thermal conductivity and the rmal conductivity of soil,others influencing factors are diameter and depth ofthe pipe,impact of winter on the pipeline depth is far greater than in summer,and soil moisture has a small impact on heat transfer pipes than others.