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Experimental and numerical evaluations on characteristics of vented methane explosion

甲烷-空气泄爆特性的实验与数值模拟

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Abstract

To research the characteristics of vented explosion of methane-air mixture in the pipeline, coal mine tunnel or other closed space, the experiments and numerical simulations were carried out. In this work, explosion characteristics and flame propagation characteristics of methane in pipeline and coal mine tunnel are studied by using an explosion test system, combined with FLACS software, under different vented conditions. The numerical simulation results of methane explosion are basically consistent with the physical experiment results, which indicates that the numerical simulation for methane explosion is reliable to be applied to the practice. The results show that explosion parameters (pressure, temperature and product concentration) of methane at five volume fractions have the same change trend. Nevertheless, the explosion intension of 10.0% methane is the largest and that of 9.5% methane is relatively weak, followed by 11.0% methane, 8.0% methane and 7.0% methane respectively. Under different vented conditions, the pressure and temperature of methane explosion are the highest in the pipeline without a vent, followed by the pipeline where ignition or vent position is in each end, and those are the lowest in the pipeline with ignition and vent at the same end. There is no significant effect on final product concentration of methane explosion under three vented conditions. For coal mine tunnel, it is indicated that the maximum explosion pressure at the airproof wall in return airway with the branch roadway at 50 m from goaf is significantly decreased while that in intake airway does not change overwhelmingly. In addition, when the branch roadway is longer or its section is larger, the peak pressure of airproof wall reduces slightly.

摘要

为研究甲烷-空气混合物在管道、煤矿巷道等封闭空间内的通风爆炸特性,进行了相关实验和数值模拟。本文利用爆炸实验系统,结合FLACS 软件,研究了不同泄爆条件下甲烷在管道和煤矿巷道中的爆炸特性和火焰传播特性。数值模拟与物理实验结果基本一致,说明甲烷爆炸的数值模拟是可靠的,且可应用于实际。研究结果表明,五种体积分数下甲烷的爆炸参数(压力、温度和产物浓度)变化趋势相同,但10.0%甲烷的爆炸强度最大,9.5%甲烷,11.0%甲烷,8.0%甲烷,7.0%甲烷的爆炸强度依次减弱。在不同泄爆条件下,甲烷爆炸压力和温度在无泄压条件的管道中最高,其次是在异端点火和泄压的管道,在同端点火和泄压的管道中最小。然而,三种泄爆条件对甲烷爆炸的最终产物浓度没有明显影响。对于煤矿巷道,距采空区50 m 处的支巷使回风巷道的最大爆炸压力明显减小,而进风回风巷道的最大爆炸压力变化不大。此外,当支巷道较长或支巷截面较大时,密闭墙处峰值压力略有降低。

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Authors and Affiliations

  1. School of Safety Science & Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Bin Su  (苏彬), Zhen-min Luo  (罗振敏) & Tao Wang  (王涛)

  2. School of Energy, Xi’an University of Science and Technology, Xi’an, 710054, China

    Lang Liu  (刘浪)

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  1. Bin Su  (苏彬)
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  2. Zhen-min Luo  (罗振敏)
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  3. Tao Wang  (王涛)
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  4. Lang Liu  (刘浪)
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Correspondence to Zhen-min Luo  (罗振敏).

Additional information

Foundation item: Project(51674193) supported by the National Natural Science Foundation of China; Project(2019-JLM-9) supported by the Natural Science Foundation of Shaanxi Province, China; Project(2019-M-663780) supported by the Postdoctoral Science Foundation, China

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Su, B., Luo, Zm., Wang, T. et al. Experimental and numerical evaluations on characteristics of vented methane explosion. J. Cent. South Univ. 27, 2382–2393 (2020). https://doi.org/10.1007/s11771-020-4456-1

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  • DOI: https://doi.org/10.1007/s11771-020-4456-1

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