海底热油管道的悬空段由于没有周围泥沙的保温蓄热作用,停输之后管内温降比埋入海底泥沙中的管段快得多,故而其温降成为停输过程的关键.针对海底管线悬空段的热力特性,考虑原油凝固潜热对停输温降的影响,利用CFD软件,对其停输温降过程进行数值模拟.分析温降变化规律、不同海水温度对温降的影响,从而确定最佳停输时间,为海底热油管道制定再启动方案提供理论依据.%With no heat preservation effect of the sediment around the oil pipeline, temperature drop of the suspended sector of submarine oil pipeline is faster than the temperature of the sector embedded in the submarine sediment. So the temperature drop process becomes the key of stopping transportation. According to the thermal characteristics of the suspended sector of submarine oil pipeline, considering the impact of solidified the latent heat, temperature drop is simulated in submarine pipeline during shutdown with time by the CFD software. Change rule of temperature drop and the influence of the temperature of seawater are analyzed, which decide optimum time for shutdown and provides a theoretical guidance for safe submarine oil pipeline startup.
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