Experimental study on cryo-compressed hydrogen ignition and flame
Experimental study on cryo-compressed hydrogen ignition and flame
复制标题
低温压缩氢气点火及火焰实验研究
DOI：
10.1016/j.ijhydene.2019.12.091
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发表时间：
2020
影响因子：
7.2
通讯作者：
Kota Miyanabe
中科院分区：
文献类型：
--
作者：
Hiroaki Kobayashi;Daiki Muto;Yu Daimon;Yutaka Umemura;Yuichiro Takesaki;Yusuke Maru;Tsuyoshi Yagishita;Satoshi Nonaka;Kota Miyanabe
为建立燃料电池汽车(FCV)氢气站处理的高压氢的安全标准，进行了氢气点火试验。在实验中，从针孔喷嘴中泄漏了加压到80 Mpa以上的低温氢气，并测量了点火时的爆炸压力和稳定燃烧时的火焰长度。实验中使用的供氢设备最大流量为100千克/小时，最大放电压力为90兆帕，温度调节范围为50千克-300千克。用0.2 mm、0.4 mm、0.7 mm和1.0 mm泄漏氢气。在实验中，研究了针孔喷嘴直径、供氢压力和温度以及点火器位置对爆炸压力和火焰长度的影响。点火器放置正确后，一旦形成稳定的火焰，即使关闭点火源，燃烧也会继续，这就需要停止氢气供应来扑灭大火。实验结果表明，爆炸压力与火焰长度可表示为氢气泄漏流量的关联式。然而，即使泄漏流量相同，我们也发现火焰长度随着供氢温度的降低而增加。我们给出了一个低温压缩氢火焰长度的关联式，该关联式比以前提出的300K氢焰的关联式长约30%。
This paper presents a hydrogen ignition experiment conducted to establish safety standards for high-pressure hydrogen handled at the hydrogen stations for fuel cell vehicles (FCV). In the experiment, cryogenic hydrogen pressurized to over 80 MPa was leaked from a pinhole nozzle, and the blast pressure at the ignition and the flame length during steady combustion were measured. The hydrogen supply equipment used in the experiment has a maximum flow rate of 100 kg/h, a maximum discharge pressure of 90 MPa, and a temperature adjustment range of 50 K–300 K. Four types of pinhole nozzles with different outlet diameters, viz. 0.2 mm, 0.4 mm, 0.7 mm, and 1.0 mm were used to leak the hydrogen. In the experiment, the effects of the pinhole nozzle diameter, hydrogen supply pressure and temperature, and an igniter location on the blast pressure and flame length were evaluated. The igniter being appropriately positioned, once a steady flame was formed, combustion continued even if the ignition source was turned off, which necessitated the stopping of hydrogen supply to extinguish the fire. As a result of the experiment, it was found that the blast pressure and the flame length can be expressed as the correlation equations of the hydrogen leakage flow rate. However, even if the leakage flow rate was the same, we found that the flame length increases with decreasing the hydrogen supply temperature. We presented a correlation equation for the cryo-compressed hydrogen flame length that is about 30% longer than the previously presented equations for 300 K hydrogen flame.