北极多年冻土区埋地输气管道周边温度场数值分析

李欣泽; 金会军; 吴青柏; 魏彦京; 温智

doi:10.11867/j.issn.1001-8166.2021.010

地球科学进展 >

2021 , Vol. 36 >Issue 1: 69 - 82

DOI: https://doi.org/10.11867/j.issn.1001-8166.2021.010

研究论文

北极多年冻土区埋地输气管道周边温度场数值分析

李欣泽 ,
金会军 ,
吴青柏 ,
魏彦京 ,
温智

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^1.中国科学院西北生态环境资源研究院冻土工程国家重点实验室，甘肃兰州 730000
^2.中国科学院大学，北京 100049
^3.中石化石油工程设计有限公司，山东东营 257000
^4.东北林业大学土木工程学院与寒区科学与工程研究院，黑龙江哈尔滨 150000
^5.中国建筑东北设计研究院有限公司，沈阳 110006

李欣泽（1987-），男，新疆克拉玛依人，博士研究生，主要从事冻土与寒区工程研究. E-mail：slecclxz@sina.com

金会军（1967-），男，陕西岐山人，教授，主要从事冻土学和寒区工程、环境及其管理方面的研究. E-mail：hjjin@lzb.ac.cn

收稿日期: 2020-11-21

修回日期: 2020-12-26

网络出版日期: 2021-03-19

基金资助

中石化石油工程技术服务有限公司科研课题“阿拉斯加天然气管道建设关键技术可行性研究”(SG18-50J)

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Numerical Analysis of Temperature Field Around Buried Gas Pipeline in Arctic Permafrost Regions

Xinze LI ,
Huijun JIN ,
Qingbai WU ,
Yanjing WEI ,
Zhi WEN

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^1.State Key Laboratory of Frozen Soils Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China
^3.Sinopec Petroleum Engineering Co. ，Dongying Shandong 257000，China
^4.School of Civil Engineering/Northeast-China Observatory and Research-Station of Permafrost Geo-Environment— Ministry of Education/Institute of Cold-Regions Engineering，Science and Technology，Northeast Forestry University，Harbin 150000，China
^5.China Northeast Architectural Design and Research Institute Co. ，Shenyang 110006，China

LI Xinze (1987-）， male， Karamay City， Xinjiang Uygur Autonomous Region， Ph.D student. Research areas include permafrost and cold engineering. E-mail：slecclxz@sina.com

JIN Huijun (1967-)， male， Qishan County， Shannxi Province， Professor. Research areas include permafrost， cold zone engineering， environment and project management. E-mail：hjjin@lzb.ac.cn

Received date: 2020-11-21

Revised date: 2020-12-26

Online published: 2021-03-19

Supported by

the Applied Science of Sinopec Petroleum Engineering Construction Co. ”Feasibility study on key technologies for Alaska natural gas pipeline construction”(SJ18-50J)

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摘要

以北极规划输气管道工程为依托，建立埋地管道与冻土热交换相互作用数值计算模型，探究了埋地管道在连续多年冻土区、非连续多年冻土区和季节冻土区内，按照不同操作温度（5、-1和-5 ℃）运行情况下管道周围冻土温度演化过程。计算结果表明：同一区域不同管温对冻土上限值影响差异较大，尤其是在非连续多年冻土区，无论管道是正温输送还是负温输送，由于管道的运营，极大地影响了冻土上限值。5 ℃正温管道将导致冻土上限下降1~3倍管径；-1 ℃和-5 ℃负温管道将有助于提高冻土人为上限。建议在连续多年冻土区管道采用-1 ℃输送温度；在非连续多年冻土区冬季采用-1 ℃输送温度，夏季可以是正温，接近环境大气温度，但全年输气平均温度要小于0 ℃；在季节冻土区，若按照负温输送，反而容易引起管基土冻胀，建议输气温度不作特别控制，与温带地区管道类似，正温输送。希望能够为北极多年冻土区天然气管道建设提供新的思路。

关键词： 多年冻土; 输气管道; 管土换热; 数值模拟; 冷却输送工艺

本文引用格式

李欣泽 , 金会军 , 吴青柏 , 魏彦京 , 温智 . 北极多年冻土区埋地输气管道周边温度场数值分析[J]. 地球科学进展, 2021 , 36(1) : 69 -82 . DOI: 10.11867/j.issn.1001-8166.2021.010

Abstract

Based on one planned arctic gas pipeline project which will cross continuous， discontinuous and sporadic permafrost zones and zones of seasonal frost from north to south， with 5 ℃， -1 ℃ and -5 ℃ settings of gas-flow in buried pipeline， a geothermal model for the interactions between pipeline and permafrost was established to investigate the thermal effect of pipelines on the freezing and thawing of soil around pipeline and thermal stability of permafrost by using a commercially available finite-element program for numerical analysis. The results show that different pipeline gas flow temperatures influence the permafrost table greatly. Especially in discontinuous permafrost zones the permafrost table is influenced in both positive temperature and negative temperature. The warm （+5 ℃） gas pipeline could lower permafrost table by about 1 to 3 times of pipe diameter and aggravate the degradation of permafrost around pipeline； The cold （-1 ℃） and chilled （-5 ℃） gas pipeline can effectively raise the permafrost table and maintain the thermal stability of frozen soil， but the temperature of soils under the chilled （-5 ℃） pipeline decreases obviously， which may lead to frost heave hazards. In terms of thermal stability around pipeline， it is advised that a transporting temperature of gas flow as -1 ℃ should be adopted in continuous permafrost zone all year round which causes only little disturbance to the permafrost environment； in discontinuous permafrost zone pipeline could operate above freezing in the summer months with the station discharge temperature trending the ambient air temperature， but the discharge temperature must be maintained as -1 ℃ throughout the winter months； in zone of seasonal frost the cold （-1 ℃） and chilled （-5 ℃） pipeline may cause frost heave， therefore pipeline should run in positive temperature without extra temperature cooling control. Finally， the initial framework solutions are proposed in hope of supplementing existing gas transporting process theory and identifying new approaches for gas pipeline in northern and upland permafrost regions.

Key words： Natural gas pipeline; Permafrost regions; Pipe-soil heat exchange; Numerical simulation; Chilled transporting processes

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