Influence of Water Mist and Sliding Device on Explosion Characteristics of Premixed Methane/Air
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摘要: 大量甲烷爆炸事故表明，甲烷/空气预混气体爆炸容易造成大量人员伤亡和巨大财产损失。利用10 cm × 10 cm × 100 cm透明实验管道，探究了细水雾协同滑动装置对甲烷爆炸特性的影响，并着重分析爆炸火焰和超压。结果表明：协同作用下，细水雾对燃烧区超压的影响较小，对未燃区超压峰值有明显衰减作用，甲烷体积分数为11.5%时衰减幅度最大，为44.71%。细水雾对指形火焰有冲毁作用，可加快火焰传播速度，甲烷体积分数为11.5%时，火焰传播速度的提升幅度最大，为62.50%。滑动装置反向压缩火焰至细水雾作用区，加速火焰焠熄。甲烷体积分数为9.5%和11.5%时，火焰焠熄时间明显下降，分别为20.76%和29.65%；甲烷体积分数为7.5%时，火焰焠熄时间下降3.5 ms。Abstract: A large number of methane explosion accidents show that premixed methane/air gas explosion is easy to cause huge casualties and property losses. The influence of the water mist cooperating with sliding device on the explosion characteristics of methane was explored by using the 10 cm × 10 cm × 100 cm transparent experimental pipe, and the explosion flame and overpressure was analyzed emphatically. The results show that the effect of water mist on the overpressure in the combustion zone is little under the synergistic effect. It has a significant attenuation effect on the peak overpressure in the unburned zone, and the maximum attenuation is 44.41% when the methane concentration is 11.5%. The water mist can destroy the finger flame and accelerate the flame propagation. When the methane concentration is 11.5%, the flame propagation speed increases by 62.50%. The sliding device reversely compresses the flame to the water mist action area to accelerate the flame extinction. When the methane concentration was 9.5% and 11.5%, the flame quenching time decreased significantly, which are 20.76% and 29.65%, respectively. When the methane concentration was 7.5%, the flame quenching time decreased by 3.5 ms.
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Key words:
- water mist /
- sliding device /
- cooperative /
- methane /
- explosion
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图 2 滑动装置作用下甲烷爆炸超压变化
Figure 2. Overpressure changes of methane explosion under the action of sliding device
图 3 细水雾协同滑动装置作用下甲烷爆炸超压变化
Figure 3. Overpressure changes of methane explosion under the action of water mist and sliding device
图 4 添加细水雾与无细水雾工况下压力对比
Figure 4. Pressure comparison chart between water mist added and no water mist
图 5 滑动装置存在下火焰前锋传播示意图
Figure 5. Schematic diagram of flame front propagation in the presence of a sliding device
图 6 添加细水雾工况下火焰前锋传播示意图
Figure 6. Schematic diagram of flame front propagation under the condition of adding water mist
图 8 火焰前锋传播速度和滑动装置滑移速度
Figure 8. Propagation velocity of flame front and sliding velocity of sliding device
表 1 压力传感器位置
Table 1. Distribution of pressure sensors along the pipeline
Location of sensor Voltage sensitivity/(mV·MPa−1) Range/MPa Installation position/cm P1 7 180 0–0.69 17.5 P2 7 608 0–0.69 100.0 
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表 2 实验工况
Table 2. Experimental conditions
Condition No. $\varphi$/% Water mist/MPa Condition No. $\varphi$/% Water mist/MPa 1 (C1) 7.5 4 (C4) 7.5 0.1 2 (C2) 9.5 5 (C5) 9.5 0.1 3 (C3) 11.5 6 (C6) 11.5 0.1
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表 3 细水雾作用下P1和 P2测量点处压力
Table 3. Pressure at P1 and P2 measuring points under the action of water mist
$\varphi $/% Overpressure/kPa Percentage drop/% P1 P2 7.5 15.0 9.2 38.67 9.5 19.0 14.0 26.32 11.5 15.0 9.4 37.33
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[1] 丁小勇. 甲烷-空气爆炸火焰传播的微观研究[D]. 太原: 中北大学, 2013.DING X Y. Microscopic research of flame propagation on methane-air explosion [D]. Taiyuan: North University of China, 2013. [2] 王秋菊. 细水雾作用于甲烷爆炸数值模拟[D]. 大连: 大连理工大学, 2016.WANG Q J. Numerical simulation of methane explosion affected by fine water mist [D]. Dalian: Dalian University of Technology, 2016. [3] 陆守香, 何杰, 于春红, 等. 水抑制瓦斯爆炸的机理研究 [J]. 煤炭学报, 1998, 23(4): 417–421.LU S X, He J, YU C H, et al. Mechanism of gas explosion suppression by water [J]. Journal of China Coal Society, 1998, 23(4): 417–421. [4] WINGERDEN K V. Mitigation of gas explosions using water deluge [J]. Process Safety Progress, 2000, 19(3): 173–178. doi: 10.1002/prs.680190309 [5] MEDVEDEV S P, GELl'FAND B E, POLENOV A N, et al. Flammability limits for hydrogen-air mixtures in the presence of ultrafine droplets of water (fog) [J]. Combustion Explosion and Shock Waves, 2002, 38(4): 381–386. doi: 10.1023/A:1016277028276 [6] 张鹏鹏. 超细水雾增强与抑制瓦斯爆炸的实验研究[D]. 大连: 大连理工大学, 2013.ZHANG P P. Experimental study of enhancing and mitigating the methane/air explosion by ultrafine water mist [D]. Dalian: Dalian University of Technology, 2013. [7] YU M G, WAN S J, XU Y L, et al. The influence of the charge-to-mass ratio of the charged water mist on a methane explosion [J]. Journal of Loss Prevention in the Process Industries, 2016, 41: 68–76. doi: 10.1016/j.jlp.2016.03.020 [8] 余明高, 万少杰, 徐永亮, 等. 荷电细水雾对管道瓦斯爆炸超压的影响规律研究 [J]. 中国矿业大学学报, 2015, 44(2): 227–232.YU M G, WAN S J, XU Y L, et al. Study on the overpressure of gas explosion in the pipeline affected by charged water mist [J]. Journal of China University of Mining and Technology, 2015, 44(2): 227–232. [9] 余明高, 杨勇, 裴蓓, 等. N2双流体细水雾抑制管道瓦斯爆炸实验研究 [J]. 爆炸与冲击, 2017, 37(2): 194–200. doi: 10.11883/1001-1455(2017)02-0194-07YU M G, YANG Y, PEI B, et al. Experimental study on suppression of pipeline gas explosion by N2 two-fluid water mist [J]. Explosion and Shock Waves, 2017, 37(2): 194–200. doi: 10.11883/1001-1455(2017)02-0194-07 [10] 裴蓓, 余明高, 陈立伟, 等. CO2-双流体细水雾抑制管道甲烷爆炸实验 [J]. 化工学报, 2016, 67(7): 3101–3108.PEI B, YU M G, CHEN L W, et al. Suppression effect of CO2-twin fluid water mist on methane/air explosion in vented duct [J]. CIESC Journal, 2016, 67(7): 3101–3108. [11] 贾海林, 项海军, 李第辉, 等. 含NaCl超细水雾对不同阻塞率管道内爆炸的抑制 [J]. 爆炸与冲击, 2020, 40(4): 042201. doi: 10.11883/bzycj-2019-0268JIA H L, XIANG H J, LI D H, et al. Suppression of explosion in pipelines with different blocking ratios by ultrafine water mist containing sodium chloride [J]. Explosion and Shock Waves, 2020, 40(4): 042201. doi: 10.11883/bzycj-2019-0268 [12] 贾海林, 翟汝鹏, 李第辉, 等. 三种盐类超细水雾抑制管道内甲烷-空气预混气爆炸的差异性 [J]. 爆炸与冲击, 2020, 40(8): 082201.JIA H L, ZHAI R P, LI D H, et al. Differences of premixed methane-air explosion in pipelines suppressed by three ultrafine water mists containing different salts [J]. Explosion and Shock Waves, 2020, 40(8): 082201. [13] DUAN Y L, YANG Y L, LI Y B, et al. Study on the explosion characteristics of methane/air premixed gas under the inhibition of sliding airtight device [J]. Energy Sources Part A Recovery Utilization and Environmental Effects, 2020: 1–17. [14] XIAO H H, WANG Q S, SHEN X B, et al. An experimental study of premixed hydrogen/air flame propagation in a partially open duct [J]. International Journal of Hydrogen Energy, 2014, 39(11): 6233–6241. doi: 10.1016/j.ijhydene.2013.05.003 [15] YU M G, YANG X F, ZHENG K, et al. Experimental study of premixed syngas/air flame propagation in a half-open duct [J]. Fuel, 2018, 225: 192–202. doi: 10.1016/j.fuel.2018.03.127 -
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