起伏天然气掺氢管道气体静置分层过程数值研究

doi:10.11885/j.issn.1674-5086.2022.06.20.02

西南石油大学学报(自然科学版) ›› 2022, Vol. 44 ›› Issue (6): 132-140.DOI: 10.11885/j.issn.1674-5086.2022.06.20.02

起伏天然气掺氢管道气体静置分层过程数值研究

朱红钧¹, 陈俊文², 粟华忠¹, 唐堂¹, 何山³

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500;
2. 中国石油工程建设有限公司西南分公司, 四川成都 610041;
3. 伊尔姆环境资源管理咨询(上海)有限公司, 上海虹口 200080

收稿日期:2022-06-20 出版日期:2022-12-10 发布日期:2023-01-16
通讯作者: 朱红钧,E-mail:zhuhj@swpu.edu.cn
作者简介:朱红钧,1983年生,男,汉族,江苏靖江人,教授,博士,主要从事海洋工程流动安全与控制、CFD、流致振动、流固耦合、多相流、海洋能源开发与利用等方面的研究工作。E-mail:zhuhj@swpu.edu.cn
陈俊文,1987年生,男,汉族,四川成都人,高级工程师,硕士,主要从事天然气储运研究与设计工作。E-mail:chenjunw_sw@cnpc.-com.cn
粟华忠,1997年生,男,汉族,四川眉山人,硕士研究生,主要从事海洋油气工程方面的研究。E-mail:1210264977@qq.com
唐堂,1993年生,女,汉族,四川南充人,博士研究生,主要从事海洋油气工程方面的研究。E-mail:sweetyT369@163.com
何山,1988年生,男,汉族,陕西西安人,硕士,主要从事石油天然气相关工艺安全评估工作。E-mail:heshanbest@163.com

Numerical Investigation of the Natural Gas-hydrogen Mixture Stratification Process in an Undulating Pipeline

ZHU Hongjun¹, CHEN Junwen², SU Huazhong¹, TANG Tang¹, HE Shan³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Southwest Company, China Petroleum Engineering & Construction Corporation, Chengdu, Sichuan, 610041, China;
3. Environmental Resources Management Consulting (Shanghai) Co. Ltd., Hongkou, Shanghai 200080, China

Received:2022-06-20 Online:2022-12-10 Published:2023-01-16

摘要/Abstract

摘要： 天然气管道掺氢输送被认为是当下清洁、经济转运氢能的方式之一。利用计算流体力学方法，研究了均匀掺入不同体积分数氢气的起伏天然气管道停输后气体静止分层的过程，重点分析了起伏高差对静置分层发展历程及稳定后氢气最高体积分数的影响。结果表明，倾斜管内气体剪切作用尤为明显，气体流动可分为4个阶段：剪切启动与增强阶段、剪切起旋与衰减阶段、旋涡消亡与流动平整阶段、流动减速与垂向分层阶段。气体流动的强弱直接决定了管内体积分数的变化历程。起伏高差和管道长度同时增加的条件下，气流剪切作用加剧，静置分层达到稳定所需的时间更长。因而，需依据氢气风险浓度确定停输检修的安全窗口期。

关键词: 起伏管, 掺氢输送, 数值模拟, 气体分层, 稳定时间

Abstract: The transportation of nature gas mixed with a specific volume of hydrogen is considered to be one of the green and economical ways to transmit hydrogen. In this research, a series of numerical simulations is conducted to capture the stratification process of natural gas mixed with different volume fractions of hydrogen in an undulating pipeline after the shutdown. The effects of the height of undulating pipeline on the process of gas stratification and the maximum hydrogen concentration are examined. An obvious shear effect between gas flows is observed in the inclined tubes of such undulating pipeline. The gas flow in the pipeline could be classified into four stages:initiation and enhancement stage of gas shear effect, vortex formation and shear attenuation stage, vortex extinction and flow stabilization stage, and flow deceleration and vertical stratification stage. The variation of gas concentration depends on the strength of gas flow. The increase of pipeline height or total volume intensifies the shear effect of gas flow, resulting in a longer consuming time for the stable stratification. Therefore, a safety window period for shutdown maintenance is important to be determined according to the risk value of hydrogen concentration.

Key words: undulating pipeline, transportation of nature gas mixed with hydrogen, numerical simulation, gas stratification, stabilization time

中图分类号:

TE832

朱红钧, 陈俊文, 粟华忠, 唐堂, 何山. 起伏天然气掺氢管道气体静置分层过程数值研究[J]. 西南石油大学学报(自然科学版), 2022, 44(6): 132-140.

ZHU Hongjun, CHEN Junwen, SU Huazhong, TANG Tang, HE Shan. Numerical Investigation of the Natural Gas-hydrogen Mixture Stratification Process in an Undulating Pipeline[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 132-140.

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起伏天然气掺氢管道气体静置分层过程数值研究

Numerical Investigation of the Natural Gas-hydrogen Mixture Stratification Process in an Undulating Pipeline

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