Safety of hydrogen and natural gas blends

安全处理氢气和氢气天然气混合物需要了解泄漏产生的危险和相关风险。这些包括(但不限于)由可燃云层的范围定义的危险距离，以及喷射火焰的热效应。对于典型的连接，必须了解泄漏条件对扩散的影响。随着各国迈向氢混合网络，对潜在物理现象的理解是关键。需要努力调整安全区，以考虑到氢气混合。该项目的一个目标是扩展阿尔斯特分析模型，用于未点火和点火的喷射，以考虑甲烷和氢气-甲烷混合物。浮力对释放的影响也应考虑在内。这项研究将重点放在分析建模和计算流体动力学(CFD)建模的组合上。可交付成果--未点燃和点燃的氢以及氢-甲烷释放的关键文献回顾、危害识别和分析、可信的事故情景、氢危险的建模方法；-模拟未点燃和点燃的混合物释放的当代模型--对照现有的相关实验数据验证和/或确认模型；-模拟选定的事故情景；-制定新的安全战略和工程解决方案；

Safe handling of hydrogen and hydrogen natural gas blends requires an understanding of hazards and associated risks arising from leaks. These include (but are not limited to) hazard distances defined by the extent of the flammable cloud, and thermal effects from jet fire. The impact of leak conditions on dispersion must be understood for typical connections. Understanding of the underlying physical phenomena is key as countries move towards a network with hydrogen blends. Work is needed to adjust safety zones to account for hydrogen blends. An objective of this project is to expand Ulster analytical models for unignited and ignited jets to account for methane and hydrogen-methane blends. The effect of buoyancy on the releases should also be accounted for. The study will focus on a combination of analytical modelling and computational fluid dynamics (CFD) modelling. Deliverables-Critical literature review of unignited and ignited hydrogen, and hydrogen-methane releases, hazards identification and analysis, credible incident scenarios, modelling approaches for hydrogen hazards;-Contemporary models for simulation of unignited and ignited releases of blends-Verification and/or validation of models against available experimental data as relevant;-Simulation of selected incident scenarios;-Formulation of novel safety strategies and engineering solutions;