摘要
建立冻土区埋地热油管道停输过程水力、热力数学模型,并进行数值计算,考虑了土壤水分迁移、冰水相变及原油凝固潜热、自然对流换热对停输过程管内原油温降的影响,得到了停输期间土壤温度场分布。通过与不考虑水分迁移、冰水相变的停输温降进行对比。研究表明:受水分迁移、冰水相变的影响,管道周围土壤温度等值线向管道两侧移动范围较大,土壤平均温度与不考虑水分时相比偏高,在停输过程中管内原油温降速率小于不考虑水分时的情况,受土壤中水分的影响,停输过程管道周围土壤等温线延Y轴略向下偏移。
A hydraulic and thermal mathematical model for the buried hot oil pipeline shutdown process at frozen soil area was established,and numerical calculation was carried out by the software.Effects of soil moisture migration,ice-water phase change and latent heat of crude oil solidification on oil temperature drop in pipe during the shutdown process were analyzed,temperature distribution in the soil during the shutdown process was obtained,and compared with shutdown temperature drop of without effects of water transfer and ice-water phase change.The results show that scope of the soil temperature field contour around the pipeline is much larger influenced by the water migration and ice-water phase change.Compared with the situation without moisture,the average temperature of the soil is slightly higher.The temperature falling velocity of the crude oil is smaller than the case to neglect the water effect during shutdown process.The soil temperature field contour around the pipeline migrates down along Y axis because of soil water effect.
出处
《当代化工》
CAS
2010年第6期702-705,共4页
Contemporary Chemical Industry
关键词
停输
水分迁移
冰水相变
温降
数值模拟
Shutdown
Moisture migration
Ice-water phase transition
Temperature drop
Numerical simulation
