褐煤煤尘云在不同环境气氛的燃爆特性
|
摘要
为了研究褐煤煤尘云在不同环境气氛的燃爆特性,对褐煤的微观结构(煤质、粒径及形貌)进行表征分析的基础上,分别应用Godbert-Greenwald加热炉和20 L近球形爆炸装置,对褐煤煤尘云最低着火温度和最大爆炸压力等燃爆特性参数开展实验研究,分析了煤尘粒径、点火延迟时间对褐煤-空气燃爆特性的影响,并分析了煤尘浓度、可燃气体体积比对褐煤-甲烷-空气燃爆特性的影响。结果表明:随着煤尘粒径的减小,褐煤煤尘云的最低着火温度单调递减。随着点火延迟时间的增大,褐煤-空气最大爆炸压力先增大后减小。随着煤尘浓度增加,褐煤-甲烷-空气混合物最大爆炸压力Pmm先增大后减小;随着可燃气体体积比的增大,Pmm依次减小。当煤尘浓度为400 g/m3,可燃气体体积比为1∶3时,Pmm达到峰值0.781 MPa.这些参数对煤矿井下电力设备工业过程及表面温度的控制和煤矿井下通风、泄爆、惰化等措施的实施具有参考价值。
To study the ignition and explosion characteristics of lignite coal dust cloud in different environment atmosphere,the particle size distribution,coal quality and morphology of lignite coal were characterized,and the explosion characteristics of lignite coal dust cloud were studied using GodbertGreenwald furnace and 20 L nearly spherical explosive device,respectively. The effects of coal dust particle size and ignition delay time on explosive properties of lignite coal air was analyzed,the effects of coal dust concentration and volume ratio of combustible gas on explosive properties of lignite coalmethane-air were analyzed. The results show that with the decrease of coal dust particle size,the minimum ignition temperature of lignite coal decreases monotonically. With the increase of ignition delay time,the maximum explosion pressure of coal dust-air mixture first increases and then decreases. With the increase of coal dust concentration,Pmmfirst increases and then decreases. With the increase of volume ratio of flammable gas,Pmmdecreases. When the coal dust concentration is 400 g/m~3,the volume ra-tio of flammable gas is 1∶ 3,Pmmreaches its peak of 0. 781 MPa. The parameters are of reference value for the control of the industrial process and surface temperature of the coal mine underground power equipment and the implementation of measures such as underground ventilation,blow-out and inerting.
To study the ignition and explosion characteristics of lignite coal dust cloud in different environment atmosphere,the particle size distribution,coal quality and morphology of lignite coal were characterized,and the explosion characteristics of lignite coal dust cloud were studied using GodbertGreenwald furnace and 20 L nearly spherical explosive device,respectively. The effects of coal dust particle size and ignition delay time on explosive properties of lignite coal air was analyzed,the effects of coal dust concentration and volume ratio of combustible gas on explosive properties of lignite coalmethane-air were analyzed. The results show that with the decrease of coal dust particle size,the minimum ignition temperature of lignite coal decreases monotonically. With the increase of ignition delay time,the maximum explosion pressure of coal dust-air mixture first increases and then decreases. With the increase of coal dust concentration,Pmmfirst increases and then decreases. With the increase of volume ratio of flammable gas,Pmmdecreases. When the coal dust concentration is 400 g/m~3,the volume ra-tio of flammable gas is 1∶ 3,Pmmreaches its peak of 0. 781 MPa. The parameters are of reference value for the control of the industrial process and surface temperature of the coal mine underground power equipment and the implementation of measures such as underground ventilation,blow-out and inerting.
引文
[1]谭章禄,单斐.近十年我国煤矿安全事故时空规律研究[J].中国煤炭,2017,43(9):102-107.TAN Zhang-lu,SHAN Fei.Research on spatiotemporal regularity of coal mine safety accidents in China during last decade[J].China Coal,2017,43(9):102-107.
[2]Kundu,Sazal K,Zanganeh,et al.Explosion severity of methane-coal dust hybrid mixtures in a ducted spherical vessel[J].Powder Technology,2018(323):95-102.
[3]Ajrash,Mohammed Jabbar,Zanganeh,et al.The effects of coal dust concentrations and particle sizes on the minimum auto-ignition temperature of a coal dust cloud[J].Fire and Materials,2017,7(41):908-915.
[4]Manju Mittal.Limiting oxygen concentration for coal dusts for explosion hazard analysis and safety[J].Journal of Loss Prevention in the Process Industries,2013,26(6):1106-1112.
[5]Weiguo Cao,Qingfeng Qin,Wei Cao,et al.Experimental and numerical studies on the explosion severities of coal dust/air mixtures in a 20 L spherical vessel[J].Powder Technology,2017,310:17-23.
[6]LI Qing-zhao,LIN Bai-quan,DAI Hua-ming,et al.Explosion characteristics of H2/CH4/air and CH4/coal dust/air mixtures[J].Powder Technology,2012,229:222-228.
[7]冯永安,胡双启,胡立双,等.基于20 L球形爆炸装置的甲烷煤尘混合爆炸实验[J].中国安全生产科学技术,2012,8(7):16-19.FENG Yong-an,HU Shuang-qi,HU Li-shuang,et al.Coal dust/methane mixture explosion experiment based on 20 L spherical explosive device[J].Journal of Safety Science and Technology,2012,8(7):16-19.
[8]SI Rong-jun,LI Run-zhi,WANG Lei,et al.Experiment study on the propagation laws of gas and coal dust explosion in coal mine[J].Journal of Coal Science and Engineering(China),2009,15(3):262-266.
[9]司荣军.矿井瓦斯煤尘爆炸传播实验研究[J].中国矿业,2008,17(12):81-84.SI Rong-jun.Experiment study on the propagation laws of gas and coal dust explosion in coal mine[J].China Mining Magazine,2008,17(12):81-84.
[10]游天龙,谭迎新,许航.水平管道内甲烷-煤尘混合爆炸压力的研究[J].中北大学学报:自然科学版,2014,35(4):449-452.YOU Tian-long,TAN Ying-xin,XU Hang.Study on methane-coal dust explosion pressure in a horizontal pipeline[J].Journal of North University of China:Natural Science Edition,2014,35(4):449-452.
[11]赵飞,曹雄.水平管道内甲烷-煤尘混合爆炸的试验研究[J].安全,2015,36(4):28-30.ZHAO Fei,CAO Xiong.Experimental study on methanecoal dust mixed explosion in horizontal pipeline[J].Safety,2015,36(4):28-30.
[12]曲志明,王育德.甲烷煤尘燃烧爆炸试验研究[J].中国安全科学学报,2012,22(11):55-61.QU Zhi-ming,WANG Yu-de.Experimental study on methane and coal dust combustion and explosion[J].China Safety Science Journal,2012,22(11):55-61.
[13]樊保龙.大尺度条件下甲烷-空气和煤尘-空气混合及爆炸特性研究[D].北京:北京理工大学,2015.FAN Bao-long.Study on the characteristics of methaneair&coal dust-air mixing process and explosion in large scale conditions[D].Beijing:Beijing Institute of Technology,2015.
[14]李润之.瓦斯爆炸诱导沉积煤尘爆炸的数值模拟[J].爆炸与冲击,2010,30(5):529-534.LI Run-zhi.Numerical simulation of coal dust explosion induced by gas explosion[J].Explosion and Shock Waves,2010,30(5):529-534.
[15]王者鹏.低浓度瓦斯对煤尘爆炸下限的影响研究[J].煤矿安全,2017,48(2):26-27,32.WANG Zhe-peng.Study on influence of low concentration gas on lower explosive limit of coal dust[J].Coal Mine Safety,2017,48(2):26-27,32.
[16]李雨成,刘天奇,周西华.煤尘爆炸最大压力随点火延迟时间的时序性分析[J].中国安全科学学报,2016,26(5):30-34.LI Yu-cheng,LIU Tian-qi,ZHOU Xi-hua.Times series analysis of maximum pressure of coal dust explosion as a function of ignition delay time[J].China Safety Science Journal,2016,26(5):30-34.
[17]李雨成,毕秋苹,刘天奇.混合煤质协同作用下煤尘爆炸火焰特性研究[J].煤炭科学技术,2017,45(4):68-71,88.LI Yu-cheng,BI Qiu-ping,LIU Tian-qi.Study on flame features of coal dust explosion under coordinated role of mixed coal qualities[J].Coal Science and Technology,2017,45(4):68-71,88.
[18]郭晶,王庆.密闭空间煤粉爆炸特性的实验研究[J].爆破,2017,34(3):31-36.GUO Jing,WANG Qing.Experimental studies on explosion characteristics of coal dust in confined space[J].Blasting,2017,34(3):31-36.
[19]王岳.煤尘-甲烷爆炸的实验研究[D].大连:大连理工大学,2006.WANG Yue.Experimental studies on explosions of coal dust-methane mixture[D].Dalian:Dalian University of Technology,2006.
[2]Kundu,Sazal K,Zanganeh,et al.Explosion severity of methane-coal dust hybrid mixtures in a ducted spherical vessel[J].Powder Technology,2018(323):95-102.
[3]Ajrash,Mohammed Jabbar,Zanganeh,et al.The effects of coal dust concentrations and particle sizes on the minimum auto-ignition temperature of a coal dust cloud[J].Fire and Materials,2017,7(41):908-915.
[4]Manju Mittal.Limiting oxygen concentration for coal dusts for explosion hazard analysis and safety[J].Journal of Loss Prevention in the Process Industries,2013,26(6):1106-1112.
[5]Weiguo Cao,Qingfeng Qin,Wei Cao,et al.Experimental and numerical studies on the explosion severities of coal dust/air mixtures in a 20 L spherical vessel[J].Powder Technology,2017,310:17-23.
[6]LI Qing-zhao,LIN Bai-quan,DAI Hua-ming,et al.Explosion characteristics of H2/CH4/air and CH4/coal dust/air mixtures[J].Powder Technology,2012,229:222-228.
[7]冯永安,胡双启,胡立双,等.基于20 L球形爆炸装置的甲烷煤尘混合爆炸实验[J].中国安全生产科学技术,2012,8(7):16-19.FENG Yong-an,HU Shuang-qi,HU Li-shuang,et al.Coal dust/methane mixture explosion experiment based on 20 L spherical explosive device[J].Journal of Safety Science and Technology,2012,8(7):16-19.
[8]SI Rong-jun,LI Run-zhi,WANG Lei,et al.Experiment study on the propagation laws of gas and coal dust explosion in coal mine[J].Journal of Coal Science and Engineering(China),2009,15(3):262-266.
[9]司荣军.矿井瓦斯煤尘爆炸传播实验研究[J].中国矿业,2008,17(12):81-84.SI Rong-jun.Experiment study on the propagation laws of gas and coal dust explosion in coal mine[J].China Mining Magazine,2008,17(12):81-84.
[10]游天龙,谭迎新,许航.水平管道内甲烷-煤尘混合爆炸压力的研究[J].中北大学学报:自然科学版,2014,35(4):449-452.YOU Tian-long,TAN Ying-xin,XU Hang.Study on methane-coal dust explosion pressure in a horizontal pipeline[J].Journal of North University of China:Natural Science Edition,2014,35(4):449-452.
[11]赵飞,曹雄.水平管道内甲烷-煤尘混合爆炸的试验研究[J].安全,2015,36(4):28-30.ZHAO Fei,CAO Xiong.Experimental study on methanecoal dust mixed explosion in horizontal pipeline[J].Safety,2015,36(4):28-30.
[12]曲志明,王育德.甲烷煤尘燃烧爆炸试验研究[J].中国安全科学学报,2012,22(11):55-61.QU Zhi-ming,WANG Yu-de.Experimental study on methane and coal dust combustion and explosion[J].China Safety Science Journal,2012,22(11):55-61.
[13]樊保龙.大尺度条件下甲烷-空气和煤尘-空气混合及爆炸特性研究[D].北京:北京理工大学,2015.FAN Bao-long.Study on the characteristics of methaneair&coal dust-air mixing process and explosion in large scale conditions[D].Beijing:Beijing Institute of Technology,2015.
[14]李润之.瓦斯爆炸诱导沉积煤尘爆炸的数值模拟[J].爆炸与冲击,2010,30(5):529-534.LI Run-zhi.Numerical simulation of coal dust explosion induced by gas explosion[J].Explosion and Shock Waves,2010,30(5):529-534.
[15]王者鹏.低浓度瓦斯对煤尘爆炸下限的影响研究[J].煤矿安全,2017,48(2):26-27,32.WANG Zhe-peng.Study on influence of low concentration gas on lower explosive limit of coal dust[J].Coal Mine Safety,2017,48(2):26-27,32.
[16]李雨成,刘天奇,周西华.煤尘爆炸最大压力随点火延迟时间的时序性分析[J].中国安全科学学报,2016,26(5):30-34.LI Yu-cheng,LIU Tian-qi,ZHOU Xi-hua.Times series analysis of maximum pressure of coal dust explosion as a function of ignition delay time[J].China Safety Science Journal,2016,26(5):30-34.
[17]李雨成,毕秋苹,刘天奇.混合煤质协同作用下煤尘爆炸火焰特性研究[J].煤炭科学技术,2017,45(4):68-71,88.LI Yu-cheng,BI Qiu-ping,LIU Tian-qi.Study on flame features of coal dust explosion under coordinated role of mixed coal qualities[J].Coal Science and Technology,2017,45(4):68-71,88.
[18]郭晶,王庆.密闭空间煤粉爆炸特性的实验研究[J].爆破,2017,34(3):31-36.GUO Jing,WANG Qing.Experimental studies on explosion characteristics of coal dust in confined space[J].Blasting,2017,34(3):31-36.
[19]王岳.煤尘-甲烷爆炸的实验研究[D].大连:大连理工大学,2006.WANG Yue.Experimental studies on explosions of coal dust-methane mixture[D].Dalian:Dalian University of Technology,2006.