储能科学与技术 ›› 2014, Vol. 3 ›› Issue (2): 137-141.doi: 10.3969/j.issn.2095-4239.2014.02.008

• 研究及进展 • 上一篇    下一篇

输油管道停输期间温度场数值模拟

陈小榆, 朱盼, 冯碧阳, 苏鑫, 凌沛文   

  1. 西南石油大学石油与天然气工程学院,四川 成都 610500
  • 收稿日期:2013-09-04 出版日期:2014-03-01 发布日期:2014-03-01
  • 作者简介:第一作者及通讯联系人:陈小榆(1962--),男,硕士,副教授,主要从事程流体力学及应用,油气集输工艺理论与技术研究,E-mail:952033493@qq.com.

Numerical simulations of temperature field of an oil pipeline when transportation is stopped

CHEN Xiaoyu, ZHU Pan, FENG Biyang, SU Xin, LING Peiwen   

  1. Oil Engineering Institute,Southwest Petroleum University,Chengdu 610500,Sichuan,China
  • Received:2013-09-04 Online:2014-03-01 Published:2014-03-01

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摘要： 对于高凝点原油,管线停输后很容易出现凝管现象,确定安全停输时间是保证安全启动的重要条件.原油的储热能力,管道系统向周围土壤传热能力及土壤的温度场分布决定着管线安全停输时间,研究热油管线停输期间温降规律显得尤为重要.利用CFD软件,在非稳态传热条件下,模拟出不同停输时刻管道温度场分布及温降曲线.结果表明:停输初期管内原油自然对流传热强烈,温度下降较快,后期下降缓慢,这种变化趋势和传热方式的变化相对应.当停输21 h时,原油温度降为38 ℃(高于凝点3 ℃),即安全停输时间为21 h.

关键词: 海底管道, 原油储热, 温降, 数值模拟, FLUENT

Abstract: For crude oils with a high solidifying point, freezing can easily occur when the flow is stopped. Determining the maximum stopping time is therefore crucially important for safe rebooting of the system. This stopping time depends on the heat storage capacity of crude oil, heat transfer conditions of the pipeline system and surrounding soil temperature field. This paper reports a numerical study on the unsteady state heat transfer of an oil transportation line under the stopping conditions. The results indicate a strong natural convection in the crude oil and the temperature of crude oil in pipeline drops rapidly in the initial stage of the stopping transportation, and the temperature decrease slows down with time. Such a change in the time dependence of temperature is related to the change of heat transfer mode from natural convection and conduction in the initial stage to conduction in the late stage. For the conditions considered in this work, the oil temperature drops to 38 ℃ after 21 hours, suggesting the stopping time should not exceed 21 hours.

Key words: submarine pipeline, crude oil heat storage, temperature drop, numerical simulation, FLUENT

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