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输油管道土壤温度场的数值计算
引用本文:吴明,江国业,安丙威.输油管道土壤温度场的数值计算[J].石油化工高等学校学报,2001,14(4):54-57.
作者姓名:吴明  江国业  安丙威
作者单位:1. 抚顺石油学院储运工程系,
2. 大庆石油管理采油五厂,
基金项目:东北输油管理局资助项目(1999-0012).
摘    要:评价埋地热油管道的热工状况,首要的问题是计算管道周围土壤的非稳态温度场,通常采用汇源法对其进行计算.汇源法把输油管在常输过程中的传热视为稳定过程,具有一定的局限性.根据埋地热油管道的传热特征,采用二维非稳定传热方程来描述输油管道的传热过程,在边界条件中充分考虑了地面温度的变化以及管径等参数的影响,建立了土壤温度场的计算模型,运用有限差分法对计算模型进行计算.在差分网格的划分中使用了混合网格法,在土壤内部的大部分区域使用矩形网格划分,在管壁附近使用极网格.这虽然是一种近似方法,但只要网格划分很小,仍可得到足够精确的解.在VC环境中编制了相应的软件,实现基础数据输入,温度场迭代和不同时间点管道周围土壤温度场中等温线绘制的功能.这一模型的建立,为后续的管道停输再启动的研究提供了科学的依据.

关 键 词:土壤温度场    差分    网格    输油管道
文章编号:1006-396(2001)04-0054-04
修稿时间:2000年12月4日

Numerical Calculation for Soil Temperature Field of Oil Pipeline
WU Ming ,JIANG Guo-ye ,AN Bing-wei.Numerical Calculation for Soil Temperature Field of Oil Pipeline[J].Journal of Petrochemical Universities,2001,14(4):54-57.
Authors:WU Ming  JIANG Guo-ye  AN Bing-wei
Affiliation:WU Ming 1,JIANG Guo-ye 1,AN Bing-wei 2
Abstract:To evaluate the thermal conditions of a underground heated pipeline, the first thing to do is to calculate unstable temperature field around the pipeline. Usually, source-convergence method is used for this purpose. The method regards oil pipeline's heat transfer in common transmission as a stable process, therefore it has usage limit. According to the heat transfer character of usual buried heated pipeline, the heat transfer course of it is described with two dimensions unstable heat transfer equations, The effect of ground surface temperature change and pipe diameter on pipe temperature drop is considered in boundary conditions, and mathematical model of soil temperature field is established, the finite difference theory is used for calculation. A mixed mesh method is presented, that is, rectangular mesh is used in the inner field, and normal line mesh is used near the pipe surface. Though the method is approximate one, if the mesh is very smaller the solution accurate enough still can be gotten. A software in VC visual studio has been programmed to input necessary data, finish iteration and draw equal temperature lines around the pipe on different time. The establishment of this model has laid the scientific base for later research on breaking down and restarting of pipeline.
Keywords:Soil temperature field  Difference  Mesh  Oil transmission pipeline  
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