CIESC Journal ›› 2022, Vol. 73 ›› Issue (10): 4754-4761.DOI: 10.11949/0438-1157.20220795

• Process safety • Previous Articles     Next Articles

Inhibition of hydrogen/air detonation propagation by inert gases

Mingchuan LEI(), Jianliang YU(), Xingqing YAN, Xianshu LYU, Yujie HOU, Xiaobing ZHAN   

  1. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2022-06-07 Revised:2022-07-14 Online:2022-11-02 Published:2022-10-05
  • Contact: Jianliang YU

惰性气体对氢气/空气爆轰传播的抑制作用

雷明川(), 喻健良(), 闫兴清, 吕先舒, 侯玉洁, 詹潇兵   

  1. 大连理工大学化工学院,辽宁 大连 116024
  • 通讯作者: 喻健良
  • 作者简介:雷明川(1998—),男,硕士研究生,1039024894@qq.com
  • 基金资助:
    国家自然科学基金项目(52174167)

Abstract:

Under normal temperature and pressure conditions, an experimental study on the suppression of hydrogen/air detonation by inert gas was carried out in a stainless steel pipe with an inner diameter of 52 mm. By changing the equivalence ratio (0.6, 0.8, 1.0, 1.2, 1.4) and inert gas species (CO2, N2, Ar), the effects of three inert gases on the detonation flame velocity were discussed. The results indicate that the detonation wave is decoupled and the flame velocity declines obviously as hydrogen/air detonation passes through the interface between combustible gas and inert gas. Flame velocity descending process can be divided into three stages: fast descent stage, slow fluctuating descent stage and flame extinction stage. CO2 has the most obvious inhibition effect, and then followed by Ar and N2. Compared with the specific heat difference, the molecular weight difference of Ar and N2 plays a dominant role in detonation suppression. Compared with the stoichiometric concentration, the attenuation degree of detonation in inert medium is larger in both fuel-lean and fuel-rich conditions. Especially, the attenuation degree of detonation in inert medium is more obvious in fuel-rich condition.

Key words: explosion, hydrogen, safety, inert gas, equivalent ratio, detonation attenuation

摘要:

常温常压条件下,在内径52 mm的不锈钢管道中开展了惰性气体对氢气/空气(H2/air)爆轰的抑制实验研究,通过改变当量比(0.6、0.8、1.0、1.2、1.4)和惰性气体种类(CO2、N2、Ar)探讨了三种惰性气体对爆轰火焰速度的影响。结果表明,H2/air爆轰通过可燃气与惰性气体分界面后,爆轰波发生解耦,火焰速度大幅度下降。整个速度下降过程分为快速下降、波动缓慢衰减、火焰消失三个阶段。三种惰性气体中CO2的抑制效果最明显,其次是Ar和N2。相较比热容差异影响,Ar和N2的分子量差异在爆轰抑制中起到主导性作用。贫燃和富燃条件下爆轰在惰性介质中衰减程度均比化学计量比工况下明显,其中富燃条件下爆轰在惰性介质中的衰减更为明显。

关键词: 爆炸, 氢, 安全, 惰性气体, 当量比, 爆轰衰减

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