Dispersion Behavior after Leakage of Hydrogen-Blended Natural Gas.
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| Title: | Dispersion Behavior after Leakage of Hydrogen-Blended Natural Gas. |
|---|---|
| Authors: | Ting Zhao1 zhaoting202201@163.com, Zhicheng Guo1 |
| Source: | Journal of Engineering Science & Technology Review. 2025, Vol. 18 Issue 3, p237-249. 13p. |
| Subjects: | Flammable limits, Chemical kinetics, Pipeline failures, Transport equation, Conditioned response, Alarms |
| Abstract: | Hydrogen exhibits high diffusivity, a wide flammable range, and strong chemical reactivity. When mixed with natural gas, hydrogen substantially intensifies the dispersion risk during leakage events and increases the probability of explosions, posing serious threats to industrial operations as well as the safety of nearby personnel and infrastructure. In order to investigate the dispersion behavior and associated safety risks of hydrogen-blended natural gas (HBNG) under pipeline failure scenarios, this study developed a three-dimensional numerical model simulating HBNG leakage and dispersion. The model employed the standard k-e turbulence framework coupled with species transport equations and was validated against existing experimental data. Using this model, the study systematically examined the influence of key factors, including hydrogen blending ratio, leakage rate, leakage direction, ventilation conditions, and the presence of obstacles, on the dispersion process. The spatiotemporal evolution of gas concentrations reaching the alarm concentration and the lower explosive limit was comprehensively analyzed. Results demonstrate a significant negative correlation between the hydrogen blending ratio, leakage rate, and emergency response time. At a constant mass leakage rate, increasing the hydrogen content to 20% shortens the alarm response time by 22%, compared to a 17.5% reduction under constant volumetric leakage conditions. Additionally, impaired ventilation conditions reduce the response time from 500 s to only 25 s, while the presence of obstacles decreases it by 50 s, notably exacerbating safety hazards. This study reveals the mechanisms behind the multifactor coupling effects on HBNG dispersion in complex environments and provides theoretical insights and technical support for safety assessment and risk mitigation strategies in industrial applications. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Engineering Science & Technology Review is the property of Technological Education Institute of Kavala and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 186704375 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dispersion Behavior after Leakage of Hydrogen-Blended Natural Gas. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ting+Zhao%22">Ting Zhao</searchLink><relatesTo>1</relatesTo><i> zhaoting202201@163.com</i><br /><searchLink fieldCode="AR" term="%22Zhicheng+Guo%22">Zhicheng Guo</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Engineering+Science+%26+Technology+Review%22">Journal of Engineering Science & Technology Review</searchLink>. 2025, Vol. 18 Issue 3, p237-249. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Flammable+limits%22">Flammable limits</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Pipeline+failures%22">Pipeline failures</searchLink><br /><searchLink fieldCode="DE" term="%22Transport+equation%22">Transport equation</searchLink><br /><searchLink fieldCode="DE" term="%22Conditioned+response%22">Conditioned response</searchLink><br /><searchLink fieldCode="DE" term="%22Alarms%22">Alarms</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Hydrogen exhibits high diffusivity, a wide flammable range, and strong chemical reactivity. When mixed with natural gas, hydrogen substantially intensifies the dispersion risk during leakage events and increases the probability of explosions, posing serious threats to industrial operations as well as the safety of nearby personnel and infrastructure. In order to investigate the dispersion behavior and associated safety risks of hydrogen-blended natural gas (HBNG) under pipeline failure scenarios, this study developed a three-dimensional numerical model simulating HBNG leakage and dispersion. The model employed the standard k-e turbulence framework coupled with species transport equations and was validated against existing experimental data. Using this model, the study systematically examined the influence of key factors, including hydrogen blending ratio, leakage rate, leakage direction, ventilation conditions, and the presence of obstacles, on the dispersion process. The spatiotemporal evolution of gas concentrations reaching the alarm concentration and the lower explosive limit was comprehensively analyzed. Results demonstrate a significant negative correlation between the hydrogen blending ratio, leakage rate, and emergency response time. At a constant mass leakage rate, increasing the hydrogen content to 20% shortens the alarm response time by 22%, compared to a 17.5% reduction under constant volumetric leakage conditions. Additionally, impaired ventilation conditions reduce the response time from 500 s to only 25 s, while the presence of obstacles decreases it by 50 s, notably exacerbating safety hazards. This study reveals the mechanisms behind the multifactor coupling effects on HBNG dispersion in complex environments and provides theoretical insights and technical support for safety assessment and risk mitigation strategies in industrial applications. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Engineering Science & Technology Review is the property of Technological Education Institute of Kavala and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.25103/jestr.183.23 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 237 Subjects: – SubjectFull: Flammable limits Type: general – SubjectFull: Chemical kinetics Type: general – SubjectFull: Pipeline failures Type: general – SubjectFull: Transport equation Type: general – SubjectFull: Conditioned response Type: general – SubjectFull: Alarms Type: general Titles: – TitleFull: Dispersion Behavior after Leakage of Hydrogen-Blended Natural Gas. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ting Zhao – PersonEntity: Name: NameFull: Zhicheng Guo IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 17912377 Numbering: – Type: volume Value: 18 – Type: issue Value: 3 Titles: – TitleFull: Journal of Engineering Science & Technology Review Type: main |
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