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借助大型埋地工业试验环道,模拟生产管道的投产预热和停输再启动过程,开展埋地热油管道传热规律的试验研究,从蓄热量、等温线等角度对土壤温度场的建立以及停输再启动后土壤温度场的恢复时间等问题进行了关联分析。研究表明:埋地管道的预热过程,投油7 d后,管外土壤等温线形态固定,但温度值随着时间的延长逐渐上移增大;投油10 d后,等温线呈椭圆形分布于管道周围,水平方向半径为1.2 m,垂直方向半径为0.9 m;在距离管壁1.4～2.0 m的范围内,土壤温度浮动较小。对于计划停输,再启动后的前3 h,土壤蓄热量的增长速率最大,需要保持原油温度的稳定,在再启动后的前10 h内,尽量减少工况变动,以利于土壤温度场的恢复。
With the aid of large-scale buried industrial test circuit, the production pipeline preheating and shutdown and restarting process are simulated and the heat transfer of buried hot oil pipeline is studied. The establishment of soil temperature field from the perspective of heat storage and isotherms, and After restarting, the soil temperature field recovery time and other issues were analyzed. The results show that the soil isotherms are fixed after 7 days of oil application, but the temperature increases gradually with the time increasing. After being dosed for 10 days, the isotherms are oval Distributed around the pipeline, the horizontal radius is 1.2 m and the vertical radius is 0.9 m. The soil temperature fluctuates within a range of 1.4-2.0 m from the pipe wall. For the first 3 h after planned shutdown and restart, the maximum rate of soil heat storage should be maintained, and the temperature of the crude oil should be kept stable. During the first 10 h after restarting, the change of working conditions should be minimized in order to facilitate the soil temperature field restore.