Safety of hydrogen and natural gas blends

氢和氢天然气混合物的安全处理需要了解泄漏引起的危害和相关风险。这些包括（但不限于）由可燃云的范围和喷射火的热效应定义的危险距离。对于典型的连接，必须了解泄漏条件对分散的影响。随着各国向氢混合燃料网络迈进，了解潜在的物理现象是关键。需要调整安全区域以考虑氢混合物。该项目的一个目标是扩展未点燃和点燃射流的阿尔斯特分析模型，以考虑甲烷和甲烷氢混合物。浮力对释放的影响也应考虑在内。该研究将集中于分析建模和计算流体动力学（CFD）建模的结合。可交付成果：对未点燃和点燃的氢、氢甲烷释放、危害识别和分析、可信的事件场景、氢危害建模方法的关键文献综述；-用于模拟未点燃和点燃混合物释放的现代模型-根据相关的可用实验数据验证和/或验证模型；-模拟选定的事件情景；-制定新的安全策略和工程解决方案；

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;