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引起的危害和相关风险。这些包括（但不限于）由易燃云的范围定义的危险距离以及喷射火的热效应。对于典型的连接，必须了解泄漏条件对扩散的影响。随着各国走向氢混合网络，了解潜在的物理现象是关键。需要调整安全区以考虑氢混合物。该项目的一个目标是扩展未点火和点火喷气机的阿尔斯特分析模型，以解释甲烷和氢-甲烷混合物。还应考虑浮力对释放的影响。该研究将重点关注分析建模和计算流体动力学（CFD）建模的结合。可交付成果 - 未点燃和点燃的氢气以及氢气-甲烷释放的关键文献综述、危害识别和分析、可信的事件场景、氢气危害的建模方法； - 用于模拟混合物未点燃和点燃释放的当代模型 - 根据相关的可用实验数据验证和/或验证模型； - 选定的事件场景的模拟； - 制定新颖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;