Review of Release Behavior of Hydrogen & Natural Gas Blends from Pipelines

Technical Report · Sun Aug 01 04:00:00 EDT 2021

DOI:https://doi.org/10.2172/1817836· OSTI ID:1817836

Baird, Austin R. ^[1]; Glover, Austin M. ^[1]; Ehrhart, Brian D. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Hydrogen can be used to reduce carbon emissions by blending into other gaseous energy carriers, such as natural gas. However, hydrogen blending into natural gas has important implications for safety which need to be evaluated. Hydrogen has different physical properties than natural gas, and these properties affect safety evaluations concerning a leak of the blended gas. The intent of this report is to begin to investigate the safety implications of blending hydrogen into the natural gas infrastructure with respect to a leak event from a pipeline. A literature review was conducted to identify existing data that will better inform future hazard and risk assessments for hydrogen/natural gas blends. Metrics with safety implications such as heat flux and dispersion behavior may be affected by the overall blend ratio of the mixture. Of the literature reviewed, there was no directly observed separation of the hydrogen from the natural gas or methane blend. No literature was identified that experimentally examined unconfined releases such as concentration fields or concentration at specific distances. Computational efforts have predicted concentration fields by modified versions of existing engineering models, but the validation of these models is limited by the unavailability of literature data. There are multiple literature sources that measured flame lengths and heat flux values, which are both relevant metrics to risk and hazard assessments. These data can be more directly compared to the outputs of existing engineering models for validation.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office
• DOE Contract Number: NA0003525
• OSTI ID: 1817836
• Report Number(s): SAND2021-9802; 698868
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
42 ENGINEERING
54 ENVIRONMENTAL SCIENCES