Fugitive emissions from a residential natural gas system and appliances operating on hydrogen-blended natural gas (HBNG) fuels

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-03-19 DOI:10.1016/j.ijhydene.2025.03.097

Theodore E. Street, Amel Ali, Cash Bertolo, Michael J. Pegg

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Abstract

Methane/hydrogen leaks are tested for four appliances and three pipework sections found in post-meter natural gas installations with 5% and 20% hydrogen using a static flux and pressure drop test method. Appliance emissions ranged from 0.75–37.1 mg CH₄ h^-1 when measured shortly after the appliance had been turned off and 0.29–5.9 mg CH₄ h⁻¹ after the appliance had been turned off for 8 h. Appliance leakage testing must take into account these two different leak rate periods. Adding hydrogen decreased methane emissions 1.12–36.99% for a 5% H₂ blend and 1.61–68.78% for a 20% blend. Pipework sections leaked less although a steel/PTFE piping section leaked 101.85 mg CH₄ h⁻¹. Observed hydrogen leakage was 4–4.5 vol% for the 5% blend and 13–14 vol% for the 20% blend. This suggests that HBNG mixtures do not leak at a significantly greater rate than natural gas.

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住宅天然气系统和使用氢混合天然气（HBNG）燃料的电器的逸散排放

使用静态通量和压降测试方法，对仪表后天然气装置中含有5%和20%氢气的四个设备和三个管道段进行甲烷/氢气泄漏测试。在器具关闭后不久测量的器具排放物范围为0.75-37.1 mg CH4 h-1，在器具关闭8小时后测量的排放物范围为0.29-5.9 mg CH4 h-1。器具泄漏测试必须考虑这两个不同的泄漏率周期。氢气的加入使5% H2混合物的甲烷排放量减少了1.12-36.99%，20%混合物的甲烷排放量减少了1.61-68.78%。管道段泄漏较少，钢/聚四氟乙烯管道段泄漏101.85 mg CH4 h−1。观察到5%共混物的氢气泄漏率为4-4.5 vol%， 20%共混物的氢气泄漏率为13-14 vol%。这表明，HBNG混合物的泄漏率不会明显高于天然气。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.