采空区遗煤氧化标志性伴生气体对瓦斯爆炸的影响
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摘要
为了研究采空区遗煤氧化过程中标志性伴生气体对瓦斯爆炸的影响,通过对煤样进行试验测定,确定遗煤升温不同阶段的标志性伴生气体。基于动力学模型CHEMKIN中Senkin的GRI 3.0甲烷燃烧反应机理,在定容条件下设定加速、激烈氧化2个阶段瓦斯与标志性伴生气体体积分数,模拟计算瓦斯爆炸温度、压力、中间产物及关键反应步敏感性系数。结果表明:随着标志性伴生气体体积分数的增加,在加速氧化阶段,爆炸时间提前了约0.003 0 s,爆炸压力及温度分别升高了约0.012 MPa和30 K;在激烈氧化阶段,爆炸时间提前了约0.000 2 s,爆炸压力升高了约0.007 MPa,两阶段自由基OH体积分数均逐渐降低,促进甲烷生成的关键反应步敏感性系数降低幅度均较大,即促进了瓦斯爆炸。
In order to study the symbolic associated gas during the oxidization process of the left coal in the mine goaf affected to the gas explosion,with the experiment measurement conducted on the coal samples,the symbolic associated gas at the different temperature rising stage of the left coal was determined. Based on the GRI 3.0 methane combustion reaction mechanism of the Senkin in CHEMKIN,under the condition of the constant volume,the volume fractions of the gas and symbolic associated gas in the two stages of the acceleration and intense oxidation were set up and the gas explosion temperature,pressure,intermediates and key reaction step sensitivity coefficient were simulated and calculated. The results showed that with the volume fraction of the symbolic associated gas increased,at the acceleration oxidation stage,the explosion time was about 0.003 0 s in advance and the explosion pressure and temperature were increased by 0.012 MPa and 30 K individually. In the intense oxidation stage,the explosion time was about 0.000 2 s in advance and the explosion pressure was increased by 0.007 MPa. The free radical OH volume fractions were steadily reduced at the two stages,thus the sensitive coefficient of key reaction step was highly reduced and could promote the gas explosion.
In order to study the symbolic associated gas during the oxidization process of the left coal in the mine goaf affected to the gas explosion,with the experiment measurement conducted on the coal samples,the symbolic associated gas at the different temperature rising stage of the left coal was determined. Based on the GRI 3.0 methane combustion reaction mechanism of the Senkin in CHEMKIN,under the condition of the constant volume,the volume fractions of the gas and symbolic associated gas in the two stages of the acceleration and intense oxidation were set up and the gas explosion temperature,pressure,intermediates and key reaction step sensitivity coefficient were simulated and calculated. The results showed that with the volume fraction of the symbolic associated gas increased,at the acceleration oxidation stage,the explosion time was about 0.003 0 s in advance and the explosion pressure and temperature were increased by 0.012 MPa and 30 K individually. In the intense oxidation stage,the explosion time was about 0.000 2 s in advance and the explosion pressure was increased by 0.007 MPa. The free radical OH volume fractions were steadily reduced at the two stages,thus the sensitive coefficient of key reaction step was highly reduced and could promote the gas explosion.
引文
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[2]张春,题正义,李宗翔.综放采空区遗煤自燃的三维数值模拟研究[J].中国安全科学学报,2013,23(5):15-21.Zhang Chun,Ti Zhengyi,Li Zongxiang.Three dimensional numerical simulation of spontaneous combustion of coal in goaf of fully mechanized caving mining[J].China Journal of Safety Science,2013,23(5):15-21.
[3]王德明.矿井火灾学[M].徐州:中国矿业大学出版社,2008.
[4]宋万新,杨胜强,徐全.基于氧气体积分数的高瓦斯采空区自燃“三带”的划分[J].采矿与安全工程学报,2012,29(2):271-276.Song Wanxin,Yang Shengqiang,Xu Quan.The division of spontaneous combustion"three zone"in high gas mining area based on oxygen volume fraction[J].Journal of Mining and Safety Engineering,2012,29(2):271-276.
[5]殷文韬.煤矿瓦斯爆炸事故的不安全动作原因研究[D].北京:中国矿业大学(北京),2014.
[6]焦宇,段玉龙,周心权,等.煤矿火区密闭过程自燃诱发瓦斯爆炸的规律研究[J].煤炭学报,2012,37(5):850-856.Jiao Yu,Duan Yulong,Zhou Xinquan,et al.Coal mine fire of closed process of gas explosion induced by spontaneous combustion of coal[J].Journal of China Coal Society,2012,37(5):850-856.
[7]余明高,梁栋林,徐永亮,等.荷电细水雾抑制瓦斯爆炸实验研究[J].煤炭学报,2014,39(11):2232-2238.Yu Ming,Liang Donglin,Xu Yongliang,et al.Electrically charged water mist suppression gas explosion experimental research[J].Journal of China coal society,2014,39(11):2232-2238.
[8]贾智伟,徐胜铭,景国勋.瓦斯爆炸冲击波在单向分叉管道内的传播规律试验研究[J].中国安全科学学报,2015,25(12):51-55.Jia Zhiwei,Xu Shengming,Jing Guoxun.Experimental study on propagation law of gas explosion shock wave in one direction branch pipe[J].Journal of Safety Science of China,2015,25(12):51-55.
[9]司荣军.温度压力耦合对甲烷爆炸极限影响的试验研究[J].安全与环境学报,2014,14(4):32-35.Si Rongjun.Experimental study on the effect of temperature and pressure on the explosion limit of methane[J].Journal of Safety and Environment,2014,14(4):32-35.
[10]魏春荣.多孔材料对瓦斯爆炸抑制作用研究[D].哈尔滨:哈尔滨工业大学,2012.
[11]余明高,万少杰,徐永亮.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):228-232,261.Yu Minggao,Wan Shaojie,Xu Yongliang.Study on the over pressure of gas explosion in the pipeline affected by charged water mist[J].Journal of China University of Mining and Technology,2015,44(2):228-232,261.
[12]贾宝山,胡如霞,皮子坤,等.采空区遗煤自燃产生的C2H4促进瓦斯爆炸特性[J].辽宁工程技术大学学报:自然科学版,2015,34(6):677-682.Jia Baoshan,Hu Ruxia,Pi Zikun,et al.Promoting gas explosion characteristics of C2H4produced by spontaneous combustion of residual coal in gob[J].Journal of Liaoning Technical University:Natural Science,2015,34(6):677-682.
[13]刘星魁,刘鹏飞,朱红青,等.高位巷瓦斯抽采下采空区自燃危险性数值分析及应用[J].中国安全科学学报,2012,22(11):119-125.Liu Xingkui,Liu Pengfei,Zhu Hongqing,et al.Numerical analysis of spontaneous combustion danger in goaf under high level methane drainage and related application[J].Journal of China Safety Science,2012,22(11):119-125.
[14]题正义,张春,李宗翔.复杂沟通条件下遗煤自燃规律的数值模拟[J].辽宁工程技术大学学报:自然科学版,2012,31(5):577-580.Ti Zhengyi,Zhang Chun,Li Zongxiang.Numerical simulation on spontaneous combustion of residual coal with complicated contacts[J].Journal of Liaoning Technical University:Natural Science,2012,31(5):577-580.
[15]Gregory P,Smith D G.Gri-Mech 3.0[EB/OL].[2016-11-20].http://www.me.berleley.edu/gri_mesh/version 30/text30.html,2005/2007.
[16]宋万新.含瓦斯风流对煤自燃氧化特性影响的理论及应用研究[D].徐州:中国矿业大学,2012.
[17]Kee R J,Rupley F M,Meeks E,et al.CHEMKIN-III:A fortran chemical kinetics package for the analysis of gas phase chemical and plasma kinetics[R].United States:Sandia National Laboratory Report CA96-8216,1996.
[18]梁运涛.瓦斯爆炸反应动力学特性及其抑制机理[M].北京:科学出版社,2013.
[19]贾宝山,王小云,张师一,等.受限空间中CO与水蒸汽阻尼瓦斯爆炸的反应动力学模拟研究[J].火灾科学,2013,22(3):131-139.Jia Baoshan,Wang Xiaoyun,Zhang Shiyi,et al.Kinetic simulation of CO and water vapor damping the gas explosion in an enclosed space[J].Fire Safety Science,2013,22(3):131-139.