CO对瓦斯爆炸反应影响机理研究

霍小泉; 寇义民; 闫振国; 范智海; 贺雁鹏

doi:10.13272/j.issn.1671-251x.2021080033

CO对瓦斯爆炸反应影响机理研究

doi: 10.13272/j.issn.1671-251x.2021080033

1.
1. 陕西陕煤铜川矿业有限公司, 陕西铜川 727000;
2.
2. 西安科技大学安全科学与工程学院, 陕西西安 710054;
3.
3. 西安科技大学能源学院, 陕西西安 710054

基金项目:

陕西省自然科学基础研究计划（S2019-JC-LH-QY-SM-0065）。

详细信息

作者简介:
霍小泉(1975-),男,陕西周至人,高级工程师,主要从事煤矿安全及生产技术管理工作,E-mail:huoty001@163.com。

中图分类号: TD712
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-12
- 修回日期: 2022-01-29
- 网络出版日期: 2022-03-01

Study on the effect mechanism of CO on gas explosion reaction

1.
Shaanxi Coal Tongchuan Mining Co., Ltd., Tongchuan 727000, China;
2.
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China;
3.
College of Energy Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

摘要

摘要: 目前针对瓦斯爆炸的研究大多以CH₄与空气混合气体为研究对象，而煤矿瓦斯爆炸并非单独的CH₄爆炸，往往存在CO等组分，对瓦斯爆炸产生一定影响。为揭示CO对瓦斯爆炸反应的影响机理，在20 L球形爆炸罐中测试了9.5% CH₄与0~4%CO混合气体的爆炸压力，结果表明：随着CO浓度增大，混合气体最大爆炸压力呈先增大后减小趋势，CO体积分数为2%时最大，为624.9 kPa。在Chemkin-Pro数值模拟软件中，采用GRI-mech 3.0机理，从化学动力学角度对CO，CH₄与空气混合气体爆炸反应进行了温度敏感性和关键自由基分析，得出CO对瓦斯爆炸反应的影响机理：在9.5%CH₄中添加少量CO可使爆炸反应体系中燃料浓度接近实际化学计量值，此时CO对瓦斯爆炸反应的促进作用占主导地位，宏观上体现为最大爆炸压力随CO浓度增大而增大；随着CO浓度继续增大，爆炸反应体系出现贫氧状态，阻碍温度升高的98，120号基元反应得到促进，促进温度升高的57，170号基元反应被抑制，宏观上体现为随着CO浓度增大，爆炸反应体系温度降低，最大爆炸压力减小；CO对自由基峰值物质的量浓度出现时间起延迟作用，添加CO后爆炸反应的点火延迟时间增大，从而降低了爆炸反应速率。
- 瓦斯爆炸 /
- 瓦斯爆炸压力 /
- 瓦斯爆炸超压 /
- 瓦斯爆炸温度 /
- 基元反应 /
- 温度敏感性 /
- 自由基
Abstract: At present, most of the research on gas explosion takes the mixed gas of CH₄ and air as the research object, but the gas explosion in coal mine is not a separate CH₄ explosion, there are often CO and other components, which have a certain effect on gas explosion. In order to reveal the effect mechanism of CO on gas explosion reaction, the explosion pressure of 9.5% CH₄ and 0-4% CO mixed gas is measured in a 20 L spherical explosion tank. The results show that with the increase of CO concentration, the maximum explosion pressure of the mixed gas increases first and then decreases, and the maximum explosion pressure is 624.9 kPa when the CO volume fraction is 2%. In the numerical simulation software of Chemkin-Pro, the temperature sensitivity and key free radicals of the gas explosion reaction of CO, CH₄ and air mixed gas are analyze from the chemical kinetics point of view by adopting the GRI-mech 3.0 mechanism, and the effect mechanism of CO on gas explosion reaction is obtained. Adding a small amount of CO to 9.5% CH₄ can make the fuel concentration in the explosion reaction system close to the actual stoichiometric value. At this time, the promotion effect of CO on the gas explosion reaction is dominant. Macroscopically, the maximum explosion pressure increases with the increase of CO concentration. As the concentration of CO continues to increase, the explosion reaction system appears lean oxygen state, the 98 and 120 elementary reactions that hinder the temperature increase are promoted, and the 57 and 170 elementary reactions that promote the temperature increase are inhibited. Macroscopically, it is reflected that with the increase of CO concentration, the temperature of the explosion reaction system decreases, and the maximum explosion pressure decreases. CO delays the appearance time of the peak amount of substance concentration of free radicals, and the ignition delay time of the explosion reaction increases after adding CO, thereby reducing the explosion reaction rate.
- gas explosion /
- gas explosion pressure /
- gas explosion overpressure /
- gas explosion temperature /
- elementary reaction /
- temperature sensitivity /
- free radicals

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参考文献(16)

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