室内受限空间中掺氢天然气爆炸模拟

将氢气掺入天然气中形成掺氢天然气,并利用现有天然气管道或管网进行输送被认为是大规模输氢的有效方式。由于氢气的最小点火能量远低于天然气、最低爆炸极限小于天然气,因此掺氢天然气泄漏后更容易发生爆炸事故,造成严重事故后果。本文采用FLACS软件研究了室内受限空间中的掺氢天然气爆炸事故,分析了掺氢比、打火点位置、计算区域是否开放和燃烧程度四种因素对掺氢天然气爆炸事故特征和演化规律的影响。结果表明，掺氢比越大,掺氢天然气爆炸发生时间越早；距离打火点越近的位置在爆炸过程中温度和超压越先开始变化；受限空间掺氢天然气爆炸的威力远大于开放空间掺氢天然气爆炸；燃烧当量比越高,爆炸威力越强。

Simulation of the Explosion of Hydrogen-Enriched Natural Gas In the Indoor Confined Space

Blending a certain proportion of hydrogen into the natural gas and using the existing natural gas pipelines or pipe networks for transportation is considered to be an effective way of large-scale hydrogen delivery. Because the minimum ignition energy of hydrogen is far lower than that of natural gas, and the lower explosion limit of hydrogen is smaller than that of natural gas, it is more likely to cause explosion accidents after the leakage of hydrogen-enriched natural gas, resulting in serious accident consequences. In this paper, FLACS software is used to study the explosion accident of hydrogen-enriched natural gas in an indoor confined space, and the influence of hydrogen blending ratio, ignition point location, ventilation of computational domain and combustion degree on the accident characteristics and evolution law of hydrogen-enriched natural gas explosion is analyzed. The results show that the higher the hydrogen blending ratio is, the earlier the explosion occurs; The closer to the ignition point, the earlier the temperature and overpressure begin to change in the explosion process; The explosion power of hydrogen-enriched natural gas in the confined space is much greater than that in the open space; The higher the equivalence ratio is, the stronger the explosion power is.