CO_2-超细水雾对CH_4/Air初期爆炸特性的影响
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摘要
为了研究CO_2和超细水雾对9.5%甲烷/空气初期爆炸特性的影响,采用高速纹影系统和定容燃烧弹对9.5%甲烷/空气初期爆炸特性进行了研究。分别改变CO_2稀释体积分数和超细水雾质量浓度,分析在二者单独和共同作用下球形火焰传播过程、火焰传播速度和爆炸超压的变化规律。结果表明:58.3g/m~3超细水雾增强了火焰不稳定性,促进了火焰加速和爆炸超压增加,表明超细水雾不足能产生促爆作用,只有当超细水雾充足时才会抑制甲烷爆炸;CO_2和超细水雾共同作用时能避免因超细水雾带来的促爆现象,可以明显减弱火焰不稳定性,减小火焰传播速度,降低爆炸超压和平均压升速率,以及明显推迟超压峰值来临时间。
In order to study the effect of CO_2 and ultrafine water mist on the initial 9.5% methane/air explosion characteristics,a high speed schlieren system and a constant volume combustion bomb were used to study the 9.5% methane/air explosion characteristics.By changing the dilution volume fraction of CO_2 and mass concentration of ultrafine water mist respectively,the change rules of flame propagation speed and explosion overpressure were analyzed under two separate and combined actions.The results show that the ultrafine water mist with a mass concentration of 58.3g/m~3 enhanced the instability of the flame and accelerated flame acceleration and explosion overpressure.This indicates that the insufficiency of the ultrafine water mist can produce detonation promotion,and the methane explosion will be suppressed only when the ultrafine water mist is sufficient.When CO_2 and ultrafine water mist act together,it can avoid the explosion phenomenon caused by ultrafine water mist,weaken the instability of spherical flame significantly,reduce the propagation velocity of the spherical flame,decrease the explosion overpressure and the mean rate of pressure rise,and delay the arrival time of the overpressure peak.This study can provide a guidance for the prevention of methane explosion.
In order to study the effect of CO_2 and ultrafine water mist on the initial 9.5% methane/air explosion characteristics,a high speed schlieren system and a constant volume combustion bomb were used to study the 9.5% methane/air explosion characteristics.By changing the dilution volume fraction of CO_2 and mass concentration of ultrafine water mist respectively,the change rules of flame propagation speed and explosion overpressure were analyzed under two separate and combined actions.The results show that the ultrafine water mist with a mass concentration of 58.3g/m~3 enhanced the instability of the flame and accelerated flame acceleration and explosion overpressure.This indicates that the insufficiency of the ultrafine water mist can produce detonation promotion,and the methane explosion will be suppressed only when the ultrafine water mist is sufficient.When CO_2 and ultrafine water mist act together,it can avoid the explosion phenomenon caused by ultrafine water mist,weaken the instability of spherical flame significantly,reduce the propagation velocity of the spherical flame,decrease the explosion overpressure and the mean rate of pressure rise,and delay the arrival time of the overpressure peak.This study can provide a guidance for the prevention of methane explosion.
引文
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[20]CHELLIAH H K,LAZZARINI A K,WANIGARATHNE P C,et al.Inhibition of premixed and non-premixed flames with fine droplets of water and solutions[J].Proceedings of the Combustion Institute,2002,29(1):369-376.DOI:10.1016/S1540-7489(02)80049-9.
[21]暴秀超,刘福水,孙作宇.预混火焰胞状不稳定性研究[J].西华大学学报:自然科学版,2014,33(1):79-83.DOI:10.3969/j.issn.1673-159X.2014.01.019.BAO Xiuchao,LIU Fushui,SUN Zuoyu.Study on instability of outwardly propagating spherical premixed flame[J].Journal of Xihua University:Natural Science Edition,2014,33(1):79-83.DOI:10.3969/j.issn.1673-159X.2014.01.019.
[22]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,2013:35-37.
[23]暴秀超,刘福水,张正芳.不同初始压力下氢气燃烧的胞状不稳定性及自加速性[J].燃烧科学与技术,2014,20(1):38-43.DOI:10.11715/rskxjs.R201307020.BAO Xiuchao,LIU Fushui,ZHANG Zhengfang.Cellular instability and self-acceleration of hydrogen combustionat various initial pressure[J].Journal of Combustion Science and Technology,2014,20(1):38-43.DOI:10.11715/rskxjs.R201307020.
[2]SCHWER D A,KAILASANATH K.Numerical simulations of the mitigation of unconfined explosions using water-mist[J].Proceedings of the Combustion Institute,2007,31(2):2361-2369.DOI:10.1016/j.proci.2006.07.145.
[3]ANANTH R,WILLAUER H D,FARLEY J P,et al.Effects of fine water mist on a confined blast[J].Fire Technology,2012,48(3):641-675.DOI:10.1007/s10694-010-0156-y.
[4]HOLBORN P G,BATTERSBY P,INGRAM J M,et al.Modelling the mitigation of lean hydrogen deflagrations in a vented cylindrical rig with water fog[J].International Journal of Hydrogen Energy,2012,37(20):15406-15422.DOI:10.1016/j.ijhydene.2012.07.131.
[5]LENTATI A M,CHELLIAH H K.Physical,thermal,and chemical effects of fine-water droplets in extinguishing counterflow diffusion flames[J].Symposium on Combustion,1998,27(2):2839-2846.DOI:10.1016/S0082-0784(98)80142-2.
[6]YOSHIDA A,OKAWA T,EBINA W,et al.Experimental and numerical investigation of flame speed retardation by water mist[J].Combustion and Flame,2015,162(5):1772-1777.DOI:10.1016/j.combustflame.2014.11.038.
[7]CAO X Y,REN J J,BI M S,et al.Experimental research on methane/air explosion inhibition using ultrafine water mist containing additive[J].Journal of Loss Prevention in the Process Industries,2016,43:352-360.DOI:10.1016/j.jlp.2016.06.012.
[8]GU R,WANG X S,XU H L.Experimental study on suppression of methane explosion with ultra-fine water mist[J].Fire Safety Science,2010,19(2):51-59.DOI:10.3969/j.issn.1004-5309.2010.02.001.
[9]HOLBORN P G,BATTERSBY P,INGRAM J M,et al.Modelling the mitigation of hydrogen deflagrations in a vented cylindrical rig with water fog and nitrogen dilution[J].International Journal of Hydrogen Energy,2013,38(8):3741-3487.DOI:10.1016/j.ijhydene.2012.12.134.
[10]MODAK A U,ABBUD-MADRID A,DELPLANQUE J P,et al.The effect of mono-dispersed water mist on the suppression of laminar premixed hydrogen-,methane-,and propane-air flames[J].Combustion and Flame,2006,144(1):103-111.DOI:10.1016/j.combustflame.2005.07.003.
[11]BOECK L R,KINK A,OEZDIN D,et al.Influence of water mist on flame acceleration,DDT and detonation in H2-air mixtures[J].International Journal of Hydrogen Energy,2015,40(21):6995-7004.DOI:10.1016/j.ijhydene.2015.03.129.
[12]BATTERSBY P N,AVERILL A F,INGRAM J M,et al.Suppression of hydrogen-oxygen-nitrogen explosions by fine water mist:Part 2.Mitigation of vented deflagrations[J].International Journal of Hydrogen Energy,2012,37(24):19258-19267.DOI:10.1016/j.ijhydene.2012.10.029.
[13]INGRAM J M,AVERILL A F,BATTERSBY P N,et al.Suppression of hydrogen-oxygen-nitrogen explosions by fine water mist:Part 1.Burning velocity[J].International Journal of Hydrogen Energy,2012,37(24):19250-19257.DOI:10.1016/j.ijhydene.2012.09.092.
[14]VOLLMER K G,ETTNER F,SATTELMAYER T.Deflagration-to-detonation transition in hydrogen/air mixtures with a concentration gradient[J].Combustion Science and Technology,2012,184(10/11):1903-1915.DOI:10.1080/00102202.2012.690652.
[15]GIERAS M.Flame acceleration due to water droplets action[J].Journal of Loss Prevention in the Process Industries,2008,21(4):472-477.DOI:10.1016/j.jlp.2008.03.004.
[16]余明高,安安,游浩.细水雾抑制管道瓦斯爆炸的实验研究[J].煤炭学报,2011,36(3):417-422.DOI:10.13225/j.cnki.jccs.2011.03.025.YU Minggao,AN An,YOU Hao.Experimental study on inhibiting the gas explosion by water spray in tube[J].Journal of China Coal Society,2011,36(3):417-422.DOI:10.13225/j.cnki.jccs.2011.03.025.
[17]曹兴岩,任婧杰,周一卉,等.超细水雾增强与抑制甲烷/空气爆炸的机理分析[J].煤炭学报,2016,41(7):1711-1719.DOI:10.13225/j.cnki.jccs.2015.1726.CAO Xingyan,REN Jingjie,ZHOU Yihui,et al.Analysis on the enhancement and suppression of methane/air explosions by ultrafine water mist[J].Journal of China Coal Society,2016,41(7):1711-1719.DOI:10.13225/j.cnki.jccs.2015.1726.
[18]CAO X Y,REN J J,ZHOU Y H,et al.Suppression of methane/air explosion by ultrafine water mist containing sodium chloride additive[J].Journal of Hazardous Materials,2015,285:311-318.DOI:10.1016/j.jhazmat.2014.11.016.
[19]PEI B,YU M G,CHEN L W,et al.Experimental study on the synergistic inhibition effect of nitrogen and ultrafine water mist on gas explosion in a vented duct[J].Journal of Loss Prevention in the Process Industries,2016,40:546-553.DOI:10.1016/j.jlp.2016.02.005.
[20]CHELLIAH H K,LAZZARINI A K,WANIGARATHNE P C,et al.Inhibition of premixed and non-premixed flames with fine droplets of water and solutions[J].Proceedings of the Combustion Institute,2002,29(1):369-376.DOI:10.1016/S1540-7489(02)80049-9.
[21]暴秀超,刘福水,孙作宇.预混火焰胞状不稳定性研究[J].西华大学学报:自然科学版,2014,33(1):79-83.DOI:10.3969/j.issn.1673-159X.2014.01.019.BAO Xiuchao,LIU Fushui,SUN Zuoyu.Study on instability of outwardly propagating spherical premixed flame[J].Journal of Xihua University:Natural Science Edition,2014,33(1):79-83.DOI:10.3969/j.issn.1673-159X.2014.01.019.
[22]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,2013:35-37.
[23]暴秀超,刘福水,张正芳.不同初始压力下氢气燃烧的胞状不稳定性及自加速性[J].燃烧科学与技术,2014,20(1):38-43.DOI:10.11715/rskxjs.R201307020.BAO Xiuchao,LIU Fushui,ZHANG Zhengfang.Cellular instability and self-acceleration of hydrogen combustionat various initial pressure[J].Journal of Combustion Science and Technology,2014,20(1):38-43.DOI:10.11715/rskxjs.R201307020.