原油差温顺序输送管道温度场的数值模拟研究

原油差温顺序输送管道的温度场不同于输送单种原油的热油管道,探明其规律有助于管道的设计和运行方案的制定.建立了非稳态传热的数学模型,采用有限容积法和热力特征线法相结合的数值算法进行了求解.用国内某差温顺序输送原油管道的现场实测数据对编制的计算程序进行了检验.受原油种类和出站温度交替变化的影响,油流温度场和土壤温度场均呈现出周期性变化的特点;不同位置温度的变化周期相同,但可能存在滞后时间;停输时机不同,管道的安全停输时间可能不同.

Numerical simulation of the temperature fields in the crude oil within pipeline and in the soil around the pipeline for sequentially transporting the crude oils of different property

The temperature fields within and around the pipeline for sequentially transporting the crude oils with different property are different from those within and around the pipeline for transporting the crude oil of the same property.The study on the temperature fields is helpful to the design of the pipeline and the establishment of its running project.The mathematical model of the unsteady heat transfer within and around the pipeline is established and it is solved numerically by combining the finite volume method with the thermal characteristic line method.The temperature fields of some pipeline for sequentially transporting the crude oils are simulated.The results show that the temperature fields periodically vary due to the effects of different kinds of oil crude and different outlet temperatures.The periods at different spots are the same,but there is a delay time.The safe shutdown time of the pipeline is related to the initial time of shutdown.The reliability of the computation program is verified by the measured temperature data of some crude pipeline with different outlet temperatures in China.