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天然气管道随动流量掺氢实验及新认识

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如何获得高掺混均匀度和精度的掺氢天然气是天然气管道掺氢输送的核心问题之一.虽然目前常采用随动流量掺氢工艺,但国内外尚未见公开报道的实验数据,氢气和天然气的掺混均匀度和掺混精度得不到实验验证,在一定程度上制约了掺氢天然气管道输送技术的进一步发展.为此,研究了天然气管道随动流量掺氢工艺,并基于高效静态混合器、氢组分浓度三维在线检测和双反馈随动流量定比掺氢,搭建了天然气管道随动流量掺氢实验系统,最后开展了掺氢流量 100 Nm3/h以内、掺氢比 5.0%～20.0%的实验研究.研究结果表明:①设计搭建的随动流量掺氢实验系统的掺混均匀度大于 95%,不考虑测量误差影响时掺氢精度绝对值小于等于 1.67%,考虑测量误差影响时,当掺氢比大于等于 10.0%时掺氢精度绝对值小于等于 3.30%,而掺氢比为 20.0%时掺氢精度绝对值小于等于 1.70%,随动流量掺氢性能优于标准规范技术指标;②相同实验条件下,受氢气分析仪精度等级和量程的影响,掺氢比越小,掺氢精度越低;③为合理表征掺氢精度,在制定相关标准规范时建议根据掺氢比范围分级定义随动流量掺氢精度.结论认为,该成果认识可为掺氢天然气管道输送技术的发展和相关标准规范的制定提供重要理论和技术参考.
An experimental study on servo-flow hydrogen blending in natural gas pipelines:New understandings
How to obtain hydrogen-blended natural gas(HBNG)with high mixing uniformity and accuracy is one of the core issues in HBNG pipeline transportation.The servo-flow hydrogen blending process is commonly used now;however,there is no publicly reported experimental data on servo-flow hydrogen blending in natural gas pipelines.The mixing uniformity and accuracy of hydrogen and natural gas cannot be experimentally verified,which restricts to some extent the development of HBNG pipeline transportation technology.This paper discusses the servo-flow hydrogen blending in natural gas pipelines.Based on an efficient static mixer,three-dimensional online detection of hydrogen component concentration,and bi-feedback servo-flow hydrogen blending with constant hydrogen blending ratio(HBR),an experimental system for servo-flow hydrogen blending in natural gas pipelines is built,and then used at the hydrogen blending flow rate below 100 Nm3/h and the HBR of 5.0%-20.0%.The results show that the mixing uniformity of HBNG obtained by the experimental system for servo-flow hydrogen blending in natural gas pipelines is greater than 95%.If the measurement error is ignored,the absolute blending accuracy is≤1.67%;if the measurement error is considered,the absolute blending accuracy is≤3.30%when the HBR is≥10.0%,and≤1.70%when the HBR is 20.0%.The servo-flow hydrogen blending performance overrides the technical indicators in applicable standards and specifications.Under the same experimental conditions,affected by the accuracy level and measurement range of the hydrogen gas analyzer,the smaller the HBR,the lower the blending accuracy.To reasonably characterize the hydrogen blending accuracy,it is recommended to define the servo-flow hydrogen blending accuracy based on the range of HBR when formulating relevant standards and specifications.The research findings provide important theoretical and technical references for the development of HBNG pipeline transportation technology and the formulation of relevant standards and specifications.

Hydrogen-blended natural gasPipeline transportationHydrogen blending processMixing uniformityBlending accuracyServo-flowStatic mixerExperimental study

李敬法、宇波、李璐伶、段鹏飞、刘翠伟、李玉星

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北京石油化工学院机械工程学院

长江大学石油工程学院

深圳燃气集团股份有限公司

中国石油大学(华东)储运与建筑工程学院

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掺氢天然气 管道输送 掺氢工艺 掺混均匀度 掺氢精度 随动流量 静态混合器 实验研究

国家重点研发计划"氢能技术"重点专项国家自然科学基金项目福建省"揭榜挂帅"引导性项目

2021YFB4001602523723112023H0054

2024

10.3787/j.issn.1000-0976.2024.07.014

天然气工业
四川石油管理局 中国石油西南油气田公司 中国石油川庆钻探工程公司

天然气工业

CSTPCD北大核心EI
影响因子：2.298
ISSN：1000-0976
年,卷(期)：2024.44(7)