铝镁合金泡沫抑制甲烷-空气混合物爆炸火焰传播
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摘要
为探究铝镁合金泡沫材料对爆炸的抑制效果,用净尺寸为80 mm×80 mm×900 mm的爆炸管道,开展该泡沫材料在不同填充密度下的甲烷爆炸抑制试验;综合探讨该种材料对爆炸火焰传播速度、压力、火焰阵面形态的影响。结果表明:当填充密度为10 kg/m~3时,铝镁合金泡沫材料对火焰传播有微弱的强化作用;当填充密度大于20 kg/m~3时,它对火焰传播转变为抑制作用,随着填充密度的增加,火焰传播速度达到第一峰值的时间和管道密封膜片破裂的时间都进一步延长;填充密度达40 kg/m~3时,火焰传播被完全抑制。受填充材料的影响,火焰形态在穿越填充区域后由层流火焰变为湍流沙漏状火焰。该种材料的抑爆机制主要体现在湍流促进和冷却抑制2个方面。
For the sake of exploring the explosion suppression efficiency of aluminum-magnesium alloy-based foam composite, explosion suppression experiments were conducted by using an explosion chamber with 80 mm×80 mm in cross-section, and 900 mm in length. The influences of the filling density on the flame propagation speed, pressure and flame front morphology were observed. The results show that when the filling density is 10 kg/m~3, flame propagation is weakly enhanced by aluminum-magnesium,that when the filling density exceeds 20 kg/m~3, the effect of this material on flame propagation is transformed into suppression, that the time for the flame propagation velocity to reach the first peak and that for the explosion pressure to reach the rupture pressure are further extended with the increase of filling density, that when the filling density is 40 kg/m~3, the explosive flame propagation is completely suppressed. Affected by the filling material, the flame front morphology changes from laminar flame to turbulent "hourglass" flame after passing through the filling area. The mechanism of explosion suppression of the material is mainly reflected in both turbulence promotion and cooling inhibition.
For the sake of exploring the explosion suppression efficiency of aluminum-magnesium alloy-based foam composite, explosion suppression experiments were conducted by using an explosion chamber with 80 mm×80 mm in cross-section, and 900 mm in length. The influences of the filling density on the flame propagation speed, pressure and flame front morphology were observed. The results show that when the filling density is 10 kg/m~3, flame propagation is weakly enhanced by aluminum-magnesium,that when the filling density exceeds 20 kg/m~3, the effect of this material on flame propagation is transformed into suppression, that the time for the flame propagation velocity to reach the first peak and that for the explosion pressure to reach the rupture pressure are further extended with the increase of filling density, that when the filling density is 40 kg/m~3, the explosive flame propagation is completely suppressed. Affected by the filling material, the flame front morphology changes from laminar flame to turbulent "hourglass" flame after passing through the filling area. The mechanism of explosion suppression of the material is mainly reflected in both turbulence promotion and cooling inhibition.
引文
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[2] NFPA 69-2014, Standard on explosion prevention systems[S].
[3] BIRK A M. Review of expanded aluminum products for explosion suppression in containers holding flammable liquids and gases[J]. Journal of Loss Prevention in the Process Industries, 2008,21(5): 493-505.
[4] 田宏, 王旭, 高永庭. 网状聚氨酯泡沫材料的制备、性能及应用[J]. 沈阳航空工业学院学报,1998,15(2): 43-46.TIAN Hong, WANG Xu, GAO Yongting. Preparation, properties and application of mesoporous polyurethane foam[J]. Journal of Shenyang Institute of Aeronautical Engineering, 1998,15(2): 43-46.
[5] 喻健良, 闫兴清. 硅酸铝棉对火焰速度和爆炸超压的抑制作用[J]. 爆炸与冲击,2013,33(4): 363-368.YU Jianliang, YAN Xingqing. The suppression of aluminum silicate cotton on flame velocity and explosion overpressure[J]. Explosion and Shock Waves, 2013,33(4): 363-368.
[6] 习红军, 翟小伟, 邓军. 几种煤矿瓦斯阻隔爆新技术分析及展望[J]. 煤矿安全, 2016,47(3): 148-151.XI Hongjun, ZHAI Xiaowei, DENG Jun. Development and outlook of several new technologies for suppression and isolation on coal mine gas explosion[J]. Safety in Coal Mines, 2016,47(3): 148-151.
[7] 张巨峰, 王晖, 武元,等. 管道内多层金属丝网对预混可燃气体爆炸火焰传播的影响[J]. 湖南科技大学学报:自然科学版,2012,27(2): 18-21.ZHANG Jufeng,WANG Hui, WU Yuan, et al. The effect of multilayer wire mesh on flame propagation of premixed combustible gas explosion[J]. Journal of Hunan University of Science & Technology:Natural Science Edition, 2012,27(2): 18-21.
[8] CHEN Peng, HUANG Fujun, SUN Yongduo, et al. Effects of metal foam meshes on premixed methane-air flame propagation in the closed duct[J]. Journal of Loss Prevention in the Process Industries, 2017,47: 22-28.
[9] 魏春荣, 徐敏强, 王树桐,等.多孔材料抑制瓦斯爆炸火焰波的实验研究[J]. 中国矿业大学学报, 2013,42(2): 206-213.WEI Chunrong, XU Minqiang, WANG Shutong, et al. Experiment of porous materials for suppressing the gas explosion flame wave[J]. Journal of China University of Mining & Technology, 2013,42(2): 206-213.
[10] 南子江, 宋爱英, 曹法和, 等. 铝合金抑爆材料抑爆性能研究[J]. 兵器材料科学与工程,2001,24(4): 19-22.NAN Zijiang, SONG Aiying,CAO Fahe, et al. Study on explosion suppression performance of aluminum alloy[J]. Ordnance Materl Science and Engineering, 2001,24(4): 19-22.
[11] 邢志祥, 张贻国, 马国良. 网状铝合金抑爆材料抑爆性能研究[J]. 中国安全科学学报, 2012,22(2): 75-80.XING Zhixiang, ZHANG Yiguo, MA Guoliang. Research on explosion suppression performance of reticulate aluminum alloy explosion suppression material[J]. China Safety Science Journal, 2012,22(2): 75-80.
[12] ROBERT Z. Deflagration suppression using expanded metal mesh and polymer foams[J]. Journal of Loss Prevention in the Process Industries,2007,20 (4): 659-663.
[13] HANS K F, ROBERT E H. Expanded-metal networks:a safety net to thwart gas explosions[J]. Chemical Engineering Progress,2001,97(12): 66-71.