埋地管道停输水热耦合土壤温度场数值计算  

Numerical computation on hydro-thermal coupling soil temperature field when buried pipeline is shut down

作　　者：武建军[1,2] 马贵阳[1] 杜明俊 曲道天[1] 张朝阳 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]中国煤炭科工集团武汉设计研究院,湖北武汉430064 [3]中国石油集团工程设计有限责任公司华北分公司,河北任丘062552

出　　处：《油气储运》2011年第3期192-195,5,共4页Oil & Gas Storage and Transportation

摘　　要：考虑水分迁移、冰水相变的影响,采用热传导模型和水热耦合模型对埋地热油管道停输过程中土壤温度场的变化进行数值计算,得到了不同时刻土壤温度场的变化规律和管内原油轴向温降曲线。研究表明:热油管道停输后,由水热耦合模型和热传导模型计算的管道轴向温降和空间径向不同位置土壤温度差异较大,前者计算得到的温度场明显高于后者的计算结果,而轴向温降速率前者明显低于后者;且随着停输时间的延长,水热耦合模型得到的土壤温度场等值线几乎呈中心对称的椭圆形分布,等温线移动相对较慢。水分迁移和冰水相变对埋地管道非稳态传热影响较大,计算时不可忽略。Considering the influence of moisture migration and ice-water phase change,heat conduction model and hydro-thermal coupling model are adopted to carry out numerical calculation in the light of the change of hydro-thermal coupling soil temperature field when buried hot oil pipeline is shut down. After that,the change laws of soil temperature field at different time and the axial temperature drop curve of crude oil pipeline are obtained. The results show that when the hydro-thermal coupling model and heat conduction model have respectively been used to calculate the pipeline axial temperature drop and the soil temperature of the radial space at different locations,the difference of calculation results is greater. The temperature field calculation results calculated by using the former model are significantly higher than the latter,but the axial temperature drop rate is significantly lower than the latter model. With the extending of the shutdown time,the soil temperature field contour that has been calculated by using the hydro-thermal coupling model appears centrosymmetric ellipse distribution. And the isotherms move relatively slowly. The moisture migration and ice-water phase change have a great influence on the non-steady heat transfer of buried pipeline, and the influence can not be ignored in the calculation process.

关 键 词：冻土 热油管道 停输 土壤温度场 轴向温降 水热耦合 模型 数值计算 

分 类 号：TE866[石油与天然气工程—油气储运工程]