关键词: 并行管道, 周期性边界条件, 土壤温度场, 数值模拟

Abstract: Hot oil pipeline and product pipeline with the parallel in the trench for the laying was studied for energy transfer process. Application of finite difference method analyzed the pipeline during normal operation of non-steady-state heat transfer model. And using finite volume method calculated the pipeline in parallel pipelines at different sections around the soil temperature field in numerical calculation. In the west pipeline, Shanshan-sibao, for example, the surface temperature with periodic boundary conditions, and obtained the discipline in different seasons at different locations along the soil temperature field. Research shows that with the cyclical changes of surface temperature, the impact of cold product pipeline to the soil temperature field around hot oil pipeline is different. And the impact on soil temperature field around the side of hot oil pipeline far away from the cold product pipeline is little. With the run-time increasing of pipeline, the impact of cold product pipeline to the soil temperature field surrounding the hot oil pipeline gradually weakened. Simulation results show that it is consistent with the practice. It provides theoretical guidance for the developing maintenance plans and intermittent delivery programs and determining safe shutdown time.

Key words: Parallel pipeline, Periodic boundary conditions, Soil temperature field, Numerical simulation