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密闭容器内氢气-甲烷-空气的爆炸特性
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福州大学环境与安全工程学院

作者简介:

王金贵(1987- ),男,博士,副教授,主要从事含能材料爆炸效应与安全防护研究。e-mail: wjgfzu@126.com

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福建省自然科学基金(2020J01505)


Experimental and Numerical sdudy on the Explosion Characteristics of Hydrogen-Methane-Air in a Closed Vessel
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College of Environment and Safety Engineering, Fuzhou University

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    摘要:

    为了氢气-甲烷混合燃料的安全使用,利用内径和长度皆为300mm的圆柱形密闭容器进行爆炸实验,研究了掺氢比(XH2=0~100%)和当量比(Φ=0.6~1.4)对火焰演化和爆炸压力特性的影响,并采用CHEMKIN软件分析了氢气-甲烷-空气预混气体的层流燃烧速度及其敏感性。结果表明,在当量比(Φ)不变的情况下,随着掺氢比(XH2)的增加,最大爆炸压力(pmax)、最大压力上升速率((dp/dtmax)、爆炸指数(KG)以及层流燃烧速度增大,到达最大压力和最大压力上升速率的时间(tAtB)逐渐缩短。点火后,火焰表面由最初的较为光滑,逐步形成蜂窝状的火焰晶格结构。在相同当量比(Φ)下,随着掺氢比(XH2)的增加,从点火到爆炸结束的时间大幅缩短,且在同一时刻,火焰半径增大,火焰表面皱褶增多。反应敏感性计算结果表明,基元反应H+O2?O+OH(R38)和H+CH3(+M)?CH4(+M)(R52)对层流燃烧速度的影响最大;关键自由基(H·、O·、OH·)的最大摩尔分数与层流燃烧速度存在正相关的关系,且掺氢比(XH2)的增加,使得关键自由基的最大摩尔分数显著增大;基元反应R38和OH+H2?H+H2O(R84)是影响关键自由基生成速率(ROP)的最主要反应。

    Abstract:

    In order to guide the application of hydrogen/methane mixture as fuel, explosion experiments were carried out using a cylindrical closed vessel with an inner diameter and length of 300 mm. The effects of hydrogen fraction (XH2) from 0 to 100% and equivalence ratio (Φ) from 0.6 to 1.4 on the flame evolution and explosion pressure were investigated. Meanwhile, CHEMKIN software was introduced to analyze the laminar burning velocity and sensitivity coefficient of the H2-CH4-air premixed gas. The results showed that, for a certain Φ, the maximum explosion pressure (pmax), the maximum pressure rise rate ((dp/dtmax), the explosion index (KG), and the laminar burning velocity increased monotonically with the increase of XH2. The duration to reach pmax and (dp/dtmax , named tA and tB, respectively, decreased gradually. After ignition, the flame surface gradually transformed from a smooth structure to a honeycomb flame lattice structure. With a constant Φ and an increasing XH2, the duration from ignition to the termination of the explosion decreased dramatically. Meanwhile, at the same moment the flame radius increased but the fold on the flame surface increased. The simulation results showed that the elementary reactions R35 and R52 had the most significant influence on the laminar burning velocity. The maximum molar fractions of the key radicals (H, O, and OH) had a positive correlation with the laminar burning velocity, and the increase of XH2 lead to a significant increase in the maximum molar fractions of the key radicals. The primitive reactions R38 and R84 were the dominant reactions affecting the rate of production (ROP) of key radicals.

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梅亮,郭进,黄时凯,等. 密闭容器内氢气-甲烷-空气的爆炸特性[J]. 含能材料,DOI:10.11943/CJEM2024186.

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  • 收稿日期: 2024-07-10
  • 最后修改日期: 2024-10-23
  • 录用日期: 2024-10-15
  • 在线发布日期: 2024-10-25
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