本文主要研究埋地输油管道热水单向预热过程的传热计算。埋地输油管道启输过程是三维非稳定传热问题,启输过程中管周土壤温度场的变化受管内热水温度和启输前地表面温度年波幅的影响,可将传热微分方程和边值条件线性组合成两个定解问题,用电子计算机进行数值求解,得出计算公式,以确定预热阶段管路任一点任一时刻的热水介质温度。本文建立的计算方法可用于工程计算。 This paper mainly studies the heat transfer calculation of unidirectional preheating of hot water in buried pipeline. The process of initiation and transportation of buried oil pipeline is a three-dimensional unsteady heat transfer problem. The change of soil temperature field in the pipe circumference during start-up is influenced by the annual hot water temperature in the pipeline and the annual amplitude of ground surface temperature before start-up. The heat transfer differential equation The boundary conditions are linearly combined into two fixed solutions, and the numerical calculation is carried out by computer. The calculation formula is obtained to determine the temperature of the hot water medium at any point of the piping in the preheating stage. The calculation method established in this paper can be used for engineering calculation.