Abstract: In the process of hot oil pipeline transport, the buried depth of the soil temperature field has a great influence , and the additional insulation layer around the pipe also influenced thermal characteristics of pipeline own. The relationship between the hot oil pipeline with additional thermal insulation layer and the soil temperature field around it was researched under the conditions of different temperature and the different buried depth. The deeper the hot oil pipeline is buried, the less influence the hot oil pipeline is caused by the temperature of the earth. The results show that in summer the deeper the pipeline is buried, the lower is the soil temperature before transport; the temperature of the exterior is cooler for the pipeline buried deeply than the one buried shallowly after stably transporting oil. And in winter, the deeper the pipeline is buried, the higher is the soil temperature before transport; the temperature of the exterior is higher for the pipeline buried deeply than the one buried shallowly after stably transporting oil. Therefore the pipe insulation layer should chose economic thickness to optimize the temperature of the oil pipe, reduce the energy consumption and improve the economic efficiency. 

Key words: Buried pipeline,    ,  Soil temperature field,     ,  Pipeline buried depth,    ,  Insulation layer

摘要： 在热油管道的输送过程中，管道埋深对其周围土壤温度场有很大影响，而且管道附加的保温层对管道自身的热力特性也产生影响。研究了不同温度、不同埋深下附加保温层的热油管道与其周围土壤温度场的关系。热油管道埋地深度越深，受地表温度影响越小。结果表明，在夏季，管道埋地越深，输油前土壤温度越低；稳定输油之后，埋地较深的管道其外壁温度比埋地较浅的管道低；在冬季，管道埋地越深，输油前土壤温度越高；稳定输油之后，埋地较深的管道其外壁温度反而比埋地较浅的管道高。因此，保温层应选取经济厚度，以期达到优化管道输送油品的温度、降低能耗、提高经济效益的目的。

关键词: 埋地管道 , 土壤温度场 , 管道埋深 , 保温层