煤尘云质量浓度对瓦斯爆炸压力影响的试验研究
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摘要
煤矿井下煤尘无处不在,而煤尘的参与会使瓦斯爆炸事故进一步扩大,继而造成更大的人员伤亡和财产损失。为认清煤尘对瓦斯爆炸压力特性的影响规律,运用20 L爆炸特性测试系统,试验研究了不同煤尘云质量浓度条件下的瓦斯爆炸压力变化情况。结果发现,当瓦斯体积分数大于最佳爆炸体积分数时,煤尘对瓦斯爆炸压力和压力上升速率有抑制作用;当瓦斯体积分数小于最佳爆炸浓度时,煤尘对瓦斯爆炸压力和压力上升速率呈现先促进后抑制的作用。
The present paper is devoted to an investigation and identification of the influential regularity of the coal dust on the characteristic features of the gas explosion pressure through an experiment on the variation of the said explosion pressure under different gas concentration conditions via the 20 L explosion. The experimental test system is supposed to consist of an air bag,an explosion tank,an air flask,with computer and vacuum pump being taken as its research tools. The experiment we have conducted observed and traced the different ratios between the gas concentration and that of the coal dust by means of the said air bags and air flasks,whereas the vacuum pump has been used for pressure control with the computer being taken to control and register the relevant procedures and the data changes of the gas explosion pressure. As a result,we have found that,under the different gas concentration conditions,the influence of the coal dust concentration on the gas explosion can be gained by analyzing the experimental data of coal dust concentration changes related to the gas maximum explosion pressure and its maximum pressure rising rates. The results show that when the gas volume concentration is greater than the optimal explosion concentration,the coal dust has an inhibitory effect on the gas explosion pressure and the pressure rise rate. When the concentration of gas volume is less than the optimal explosion concentration,coal dust first promotes and then inhibits the gas explosion pressure and the pressure rise rate.Thus,the above said inhibitive tendency can be expected to provide important theoretical bases not only for the mechanism of coexisting gas and coal dust explosion,but also for preventing from the accidents of the co-existing gas and coal dust explosion effectively.
The present paper is devoted to an investigation and identification of the influential regularity of the coal dust on the characteristic features of the gas explosion pressure through an experiment on the variation of the said explosion pressure under different gas concentration conditions via the 20 L explosion. The experimental test system is supposed to consist of an air bag,an explosion tank,an air flask,with computer and vacuum pump being taken as its research tools. The experiment we have conducted observed and traced the different ratios between the gas concentration and that of the coal dust by means of the said air bags and air flasks,whereas the vacuum pump has been used for pressure control with the computer being taken to control and register the relevant procedures and the data changes of the gas explosion pressure. As a result,we have found that,under the different gas concentration conditions,the influence of the coal dust concentration on the gas explosion can be gained by analyzing the experimental data of coal dust concentration changes related to the gas maximum explosion pressure and its maximum pressure rising rates. The results show that when the gas volume concentration is greater than the optimal explosion concentration,the coal dust has an inhibitory effect on the gas explosion pressure and the pressure rise rate. When the concentration of gas volume is less than the optimal explosion concentration,coal dust first promotes and then inhibits the gas explosion pressure and the pressure rise rate.Thus,the above said inhibitive tendency can be expected to provide important theoretical bases not only for the mechanism of coexisting gas and coal dust explosion,but also for preventing from the accidents of the co-existing gas and coal dust explosion effectively.
引文
[1] SI Rongjun(司荣军). Study on the propagation laws of gas and coal dust explosion in coal mine(矿井瓦斯煤尘爆炸传播规律研究)[D]. Qingdao:Shandong University of Science and Technology,2007.
[2] ZHOU Xinquan(周心权),WU Bing(吴兵),XU Jingde(徐景德). Basic characteristics of coal mine gas explosion[J]. China Coal(中国煤炭),2002,28(9):8-11.
[3] NAGY J,CONN J W,VERRAKIS H C. Explosion development in a spherical vessels[J]. Minerva,1968,6(3):388-397.
[4] TORRENT J G,FUCHS J C. Flammability and explosion propagation of methane-coal dust hybrid mixtures[J]. Combustion Science and Technology(燃烧科学与技术),1989,113(1):629-639.
[5] AMYOTTE P R,MINTZ K J,PEGG M J,et al. Laboratory investigation of the dust explosibility characteristics of the three nova scotia coals[J]. Journal of Loss Prevention in the Process Industry,1991,4(2):102-109.
[6] AMYOTTE P R,MINTZ K J,PEGG M J,et al. The ignitability of coal dust-air and methane-coal dust-air mixtures[J]. Fuel,1993,72(5):671-679.
[7] AJRASH M J,ZANGANEH J,MOGHTADERI B. Methane-coal dust hybrid fuel explosion properties in a large scale cylindrical explosion chamber[J]. Journal of Loss Prevention in the Process Industries,2016,40:317-328.
[8] ZHANG Yinhe(张引合),ZHANG Yansong(张延松),REN Jianxi(任建喜). Study on the influence of coal dust on low concentration gas explosion[J]. Mining Safety&Environmental Protection(矿业安全与环保),2006,33(6):20-21.
[9] LI Jiangbo(李江波). Experimental study of methane-coal dust compound explosion in closed vessel(密闭管内甲烷—煤粉复合爆炸实验研究)[D]. Dalian:Dalian University of Technology,2010.
[10] LI Runzhi(李润之). Study of the influence of ignition energy and initial pressure on the gas explosion characteristics(点火能量与初始压力对瓦斯爆炸特性的影响研究)[D]. Qingdao:Shandong University of Science and Technology,2010.
[11] XU Hang(许航). Research on methane-coal dust compound explosion pressure in horizontal pipe(水平管道内甲烷-煤尘复合爆炸压力研究)[D]. Taiyuan:North University of China,2013.
[12] GB/T 16425—1996 Determination for minimum explosive concentration of dust cloud(粉尘云爆炸下限浓度测定方法)[S].
[13] GB/T 16426—1996 Determination for maximum explosion pressure and maximum rate of pressure rise of dust cloud(粉尘云最大爆炸压力和最大压力上升速率测定方法)[S].
[14] ZHAO Hengyang(赵衡阳). Explosion principle of gas and dust(气体和粉尘爆炸原理)[M]. Beijing:Beijing Institute of Technology Press,1996.
[15] ASTM E918—2011 Standard practice for determining limits of flammability of chemicals at elevated temperature and pressure[S].
[2] ZHOU Xinquan(周心权),WU Bing(吴兵),XU Jingde(徐景德). Basic characteristics of coal mine gas explosion[J]. China Coal(中国煤炭),2002,28(9):8-11.
[3] NAGY J,CONN J W,VERRAKIS H C. Explosion development in a spherical vessels[J]. Minerva,1968,6(3):388-397.
[4] TORRENT J G,FUCHS J C. Flammability and explosion propagation of methane-coal dust hybrid mixtures[J]. Combustion Science and Technology(燃烧科学与技术),1989,113(1):629-639.
[5] AMYOTTE P R,MINTZ K J,PEGG M J,et al. Laboratory investigation of the dust explosibility characteristics of the three nova scotia coals[J]. Journal of Loss Prevention in the Process Industry,1991,4(2):102-109.
[6] AMYOTTE P R,MINTZ K J,PEGG M J,et al. The ignitability of coal dust-air and methane-coal dust-air mixtures[J]. Fuel,1993,72(5):671-679.
[7] AJRASH M J,ZANGANEH J,MOGHTADERI B. Methane-coal dust hybrid fuel explosion properties in a large scale cylindrical explosion chamber[J]. Journal of Loss Prevention in the Process Industries,2016,40:317-328.
[8] ZHANG Yinhe(张引合),ZHANG Yansong(张延松),REN Jianxi(任建喜). Study on the influence of coal dust on low concentration gas explosion[J]. Mining Safety&Environmental Protection(矿业安全与环保),2006,33(6):20-21.
[9] LI Jiangbo(李江波). Experimental study of methane-coal dust compound explosion in closed vessel(密闭管内甲烷—煤粉复合爆炸实验研究)[D]. Dalian:Dalian University of Technology,2010.
[10] LI Runzhi(李润之). Study of the influence of ignition energy and initial pressure on the gas explosion characteristics(点火能量与初始压力对瓦斯爆炸特性的影响研究)[D]. Qingdao:Shandong University of Science and Technology,2010.
[11] XU Hang(许航). Research on methane-coal dust compound explosion pressure in horizontal pipe(水平管道内甲烷-煤尘复合爆炸压力研究)[D]. Taiyuan:North University of China,2013.
[12] GB/T 16425—1996 Determination for minimum explosive concentration of dust cloud(粉尘云爆炸下限浓度测定方法)[S].
[13] GB/T 16426—1996 Determination for maximum explosion pressure and maximum rate of pressure rise of dust cloud(粉尘云最大爆炸压力和最大压力上升速率测定方法)[S].
[14] ZHAO Hengyang(赵衡阳). Explosion principle of gas and dust(气体和粉尘爆炸原理)[M]. Beijing:Beijing Institute of Technology Press,1996.
[15] ASTM E918—2011 Standard practice for determining limits of flammability of chemicals at elevated temperature and pressure[S].