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多年冻土区埋地管道保温方案的设计与有限元分析
Design and finite element analysis of insulation of pipeline buried in permafrost area
buried pipeline
; phase change; permafrost; defrostation circle; insulation多年冻土对埋地管道的危害极大,严重影响管道的运行安全,同时对周围环境造成破坏.利用有限元分析方法,综合考虑环境温度季节性变化及冻土的相变问题,对多年冻土区间歇性运营的埋地输油管道不保温时的冻土融化深度进行分析计算,论证了管道保温的必要性.分别计算了采用聚酚醛、硬质聚氨酯泡沫塑料和软质聚氨酯泡沫塑料3种保温方案时的融化深度,并对比保温效果,进而对冻土区管道保温方案的设计提出建议.
Permafrost is extremely adverse for a buried pipeline. It may seriously threaten the pipeline operation and damage the environment nearby. In this paper, with the finite element analysis and considering the seasonal variation of environmental temperature and the phase change of frozen soil, the depth at which the frozen soil can defrost is calculated when an intermittently-operating buried oil pipeline is not insulated, in order to demonstrate the necessity of pipeline insulation. Furthermore, for three insulation cases, i.e. phenolic, rigid polyurethane foam, and flexible polyurethane foam, the defrostation depths are calculated and their insulation effects are compared. On this basis, the design of insulation of pipeline buried in permafrost area is proposed.
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收稿日期:2013-12-25;改回日期:2014-10-14。
作者简介:赵树炳,工程师,1983年生,2009年硕士毕业于北京化工大学化工机械专业,现主要从事压力管道、压力容器的设计及有限元分析工作.Tel: 0316-2074192, Email: zhaoshubing@cnpc.com.cn