在加热原油管道停输过程中 ,油品温度下降 ,粘度上升 ,有时甚至出现冻管事故 ,常常给再启动带来困难。合理地进行热油管道停输后的温度计算 ,模拟原油的凝固过程 ,有利于确定安全停输时间 ,制订再启动方案。针对加热原油管道停输后油品、管道及周围介质的相互关系和它们的不稳定传热 ,提出了热力计算的数学模型。该模型综合考虑了有关物性参数随温度的变化以及在冷却过程中油品的凝固问题。采用保角变换和盒式积分法对数学模型进行了处理 ,并构造出问题的差分方程。通过数值计算分析管道停输后油品冷却和冷凝规律 ,运用文中所提出的方法 ,对加热原油管道停输温度变化和冷凝过程进行了计算 ,与实测数据和文献中计算方法相比 ,该计算结果更符合实际情况 In the process of stopping the heating of crude oil pipeline, the temperature of the oil drops, the viscosity rises, and sometimes the freezing pipe accident occurs, which often brings difficulties to restarting. It is helpful to calculate the temperature of the hot oil pipeline after shutting down and simulate the solidification process of the crude oil, which is helpful for determining the safe shut-down time and formulating the restarting plan. Aiming at the interrelationship between oil, pipeline and surrounding medium and their unstable heat transfer after the shutdown of heated crude oil pipeline, a mathematical model of thermal calculation is proposed. The model takes into account the changes of physical parameters with temperature and the solidification of the oil during the cooling process. The mathematical model is processed by conformal mapping and box integral method, and the difference equation of the problem is constructed. Through the numerical calculation and analysis of the cooling and condensing rules of the oil products after the pipeline is shut down, the temperature drop and the condensation process of the heating crude oil pipeline are calculated by the method proposed in the paper. Comparing with the measured data and the calculation method in the literature, The result is more in line with the actual situation