Predicting radiative heat fluxes and flammability envelopes from unintended releases of hydrogen
Predicting radiative heat fluxes and flammability envelopes from unintended releases of hydrogen
复制标题
预测氢气意外释放的辐射热通量和可燃性包络线
DOI：
10.1016/j.ijhydene.2006.04.009
复制
发表时间：
2007
影响因子：
7.2
通讯作者：
R. Schefer
中科院分区：
文献类型：
--
作者：
W. Houf;R. Schefer
预测高压贮氢系统发生故障时的射流火焰辐射热通量对氢的安全使用具有重要意义。关于热辐射暴露随与氢射流火焰的距离以及火焰的长度和持续时间的变化的信息对于确定氢的处理和储存的安全距离是重要的。一个同样重要的问题是确定周围空气中未点燃的氢气射流的浓度衰减，以及浓度福尔斯低于氢气可燃性下限的位置的包络。本文讨论并提出了从氢气射流火焰的辐射热传递和未点燃的氢气射流的浓度衰减的意外释放事件，涉及高压气体存储系统和燃料分配器的模型的结果。该模型是基于经验相关性和分析模型的组合，以及一个数值模型的时间吹下来的储氢罐。对于氢射流火焰，辐射热通量的预测显示和文献中记载的暴露极限相比。对于未点燃的氢气射流，浓度等值线，并计算到可燃下限的距离。并与相同压力、相同有效泄漏面积的天然气储罐泄漏进行了比较。
The prediction of the radiative heat flux from a turbulent-jet flame issuing from a damaged, high-pressure hydrogen storage system is an issue of importance for the safe use of hydrogen. Information about the variation of the thermal radiation exposure with distance from the hydrogen jet flame as well as the length and duration of the flame is important in determining safe distances for the handling and storage of hydrogen. An equally important issue is the determination of the concentration decay of an unignited hydrogen jet in the surrounding air, and the envelope of locations where the concentration falls below the lower flammability limit for hydrogen. This paper discusses and presents results from models for the radiative heat transfer from hydrogen jet flames and the concentration decay of unignited hydrogen jets for unintended release events involving high-pressure gas storage systems and fuel dispensers. The models are based on a combination of empirical correlations and analytical models, as well as a numerical model of the temporal blow-down of a hydrogen storage tank. For hydrogen jet flames, predictions of the radiative heat flux are shown and compared to exposure limits documented in the literature. For unignited hydrogen jets, concentration contours are presented and the distance to the lower flammability limit is computed. Comparisons are made with natural gas leaks from tanks at the same pressure with the same effective leak area.