不同煤质煤尘层最低着火温度特性及其影响因素研究
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摘要
为研究不同煤质的煤尘层最低着火温度特性及其影响因素,选取褐煤、长焰煤、不粘煤、气煤、焦煤、瘦煤、贫煤和无烟煤8种不同变质程度的煤尘样品,测试分析8种煤尘层的最低着火温度及最低着火温度工况下煤尘层着火类型、着火时间,并研究了粒径和煤尘层厚度对煤尘层最低着火温度的影响。结果表明,随变质程度由褐煤逐渐增大,最低着火温度T_L由290℃不断增大。褐煤、长焰煤、不粘煤和气煤为a类着火,其着火时间较为接近,均值为19. 5 min,而焦煤、瘦煤和贫煤为c类着火,着火时间均值为11 min,表明随变质程度增大,虽然T_L增大,但着火时间明显缩短。通过分析最低着火温度工况下不同煤质的温度T-时间t变化情况,认为褐煤、长焰煤、不粘煤和气煤煤尘层温度曲线中出现明显上下波动现象,是因为煤尘层厚度有限,无法长时间积聚能量。通过构建T_L与粒径r、煤尘层厚度d的三维空间拟合模型,发现粒径小、厚度大的煤尘层具有更大的着火敏感性和爆炸潜伏性,更应加强防范。
The present paper is inclined to choose 8 different kinds of coal dust samples with different metamorphism levels to trace and examine their minimum ignition temperatures of the coal dust layers and their influential factors,such as the coal of ignition temperature,the long flame coal,the non-stick coal,the gas coal,the coking coal,the lean coal,as well as the meagre coal and anthracite. What is more,we have also tested the minimum ignition temperatures of the said 8 kinds of coal dust layers with their ignition type and time under way of examination. Besides,we have also inspected and checked the impact of their particle size and thickness of their dust layers on the minimalist ignition temperature. The above said investigation and examination results show that: with the gradual increase of the degree of metamorphism from the initial ignition,it would be possible for the minimum ignition temperature of the coal dust layer to increase continuously from the temperature of 290 ℃. The ignition types of the lignite,the long-flame coal,the non-coking coal and the gas coal can all be categorized into Type a,whose ignition time should be relatively close and similar to each other for an average initial time length of 19. 5 min. As to the ignition types of the coking coal,lean coal and meagre coal,they can all be categorized into Type c, whose average ignition time length should be about 11 min. Therefore,the above said situation indicates that,the greater the degree of the metamorphism,the shorter the length their ignition time length would be. Therefore,through the analysis of the T-t changing trends of different kinds of coal features and qualities under the testing condition of the minimalist ignition temperature,it can be concluded that there may lie an obvious upward-and-downward fluctuation tendency or trend in the coal dust layer ignition temperature fluctuation curve,indicating the lignite,long flame coal,non-coking coal and the gas coal,just for their different degrees of thickness of the coal dust layer with their different potential energy accumulations for the long historical time lengths. Thus,it can be seen that,by constructing the 3-D space fitting model of the minimalist ignition temperature and r,d,it can be deduced that: the smaller the particle size,the greater the ignition sensitivity of the coal dust layers. And,in turn,the greater the thickness of the coal dust layer,the greater the explosion latency should be and would be.
The present paper is inclined to choose 8 different kinds of coal dust samples with different metamorphism levels to trace and examine their minimum ignition temperatures of the coal dust layers and their influential factors,such as the coal of ignition temperature,the long flame coal,the non-stick coal,the gas coal,the coking coal,the lean coal,as well as the meagre coal and anthracite. What is more,we have also tested the minimum ignition temperatures of the said 8 kinds of coal dust layers with their ignition type and time under way of examination. Besides,we have also inspected and checked the impact of their particle size and thickness of their dust layers on the minimalist ignition temperature. The above said investigation and examination results show that: with the gradual increase of the degree of metamorphism from the initial ignition,it would be possible for the minimum ignition temperature of the coal dust layer to increase continuously from the temperature of 290 ℃. The ignition types of the lignite,the long-flame coal,the non-coking coal and the gas coal can all be categorized into Type a,whose ignition time should be relatively close and similar to each other for an average initial time length of 19. 5 min. As to the ignition types of the coking coal,lean coal and meagre coal,they can all be categorized into Type c, whose average ignition time length should be about 11 min. Therefore,the above said situation indicates that,the greater the degree of the metamorphism,the shorter the length their ignition time length would be. Therefore,through the analysis of the T-t changing trends of different kinds of coal features and qualities under the testing condition of the minimalist ignition temperature,it can be concluded that there may lie an obvious upward-and-downward fluctuation tendency or trend in the coal dust layer ignition temperature fluctuation curve,indicating the lignite,long flame coal,non-coking coal and the gas coal,just for their different degrees of thickness of the coal dust layer with their different potential energy accumulations for the long historical time lengths. Thus,it can be seen that,by constructing the 3-D space fitting model of the minimalist ignition temperature and r,d,it can be deduced that: the smaller the particle size,the greater the ignition sensitivity of the coal dust layers. And,in turn,the greater the thickness of the coal dust layer,the greater the explosion latency should be and would be.
引文
[1] BI Mingshu(毕明树). Gas and dust explosion prevention engineering sciences(气体和粉尘爆炸防治工程学)[M]. Beijing:Chemical Industry Press,2012:12-15.
[2] JIN Longzhe(金龙哲). Dust prevention theory in mine(矿井粉尘防治理论)[M]. Beijing:Science Press,2010:21-30.
[3] LI Yucheng(李雨成). Dust prevention theory and technology in mine(矿井粉尘防治理论及技术)[M]. Beijing:China Coal Industry Publishing House,2015:29-32.
[4] CHENG Weimin(程卫民). Mine dust prevention theory and technology(矿井粉尘防治理论与技术)[M]. Beijing:China Coal Industry Publishing House,2016:29-36.
[5] HU Shuangqi(胡双启). Combustion and explosion(燃烧与爆炸)[M]. Beijing:Beijing Institute of Technology Press,2015:23-32.
[6] SI Rongjun(司荣军). Study on 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.
[7] ECKHOFF R. Understanding dust explosions. The role of powder science and technology[J]. Journal of Loss Prevention in the Process Industries,2009,22(1):105-116.
[8] ADDAI E K,GABEL D,KRAUSE U. Experimental investigation on the minimum ignition temperature of hybrid mixtures of dusts and gases or solvents[J]. Journal of Hazardous Materials,2016,301(4):314-426.
[9] ZHONG Yingpeng(钟英鹏),XU Dong(徐冬),LI Gang(李刚),et al. Experimental test of minimum ignition temperature of magnesium dust cloud[J]. Explosion and Shock Waves(爆炸与冲击),2009,29(4):429-433.
[10] PANG Lei(庞磊),MA Ran(马冉),GAO Jiancun(高建村),et al. Particle size scale effect of minimum ignition temperature of dust cloud[J]. China Powder Science and Technology(中国粉体技术),2017,23(1):68-70.
[11] PANG Lei(庞磊),MA Ran(马冉),GAO Jiancun(高建村),et al. Effect of dust cloud concentration on minimum ignition temperature of HDPE dust cloud[J]. Journal of Safety Science and Technology(中国安全生产科学技术),2017,13(5):5-9.
[12] ZHAO Jiangping(赵江平),WAN Hangwei(万杭炜).Experimental study on minimum ignition temperature of mulberry dust[J]. China Safety Science Journal(中国安全科学学报),2017,27(12):26-31.
[13] WANG Qinghui(王庆慧),YUAN Shuai(袁帅),WEI Yuanmeng(卫园梦),et al. Study on factors affecting the minimum ignition temperature of corn starch dust cloud based on interactive orthogonal test[J]. Explosion and Shock Waves(爆炸与冲击),2018,36(2):1-7.
[14] REN Ruie(任瑞娥). Testing research on minimum ignition temperature of combustible dust(可燃粉尘最低着火温度的测试研究)[D]. Taiyuan:North University of China,2015.
[15] LI Runzhi(李润之). Study on the variation rule of minimum ignition temperature of different volatile coal dust layers[J]. Journal of Safety and Environment(安全与环境学报),2017,17(3):954-957.
[2] JIN Longzhe(金龙哲). Dust prevention theory in mine(矿井粉尘防治理论)[M]. Beijing:Science Press,2010:21-30.
[3] LI Yucheng(李雨成). Dust prevention theory and technology in mine(矿井粉尘防治理论及技术)[M]. Beijing:China Coal Industry Publishing House,2015:29-32.
[4] CHENG Weimin(程卫民). Mine dust prevention theory and technology(矿井粉尘防治理论与技术)[M]. Beijing:China Coal Industry Publishing House,2016:29-36.
[5] HU Shuangqi(胡双启). Combustion and explosion(燃烧与爆炸)[M]. Beijing:Beijing Institute of Technology Press,2015:23-32.
[6] SI Rongjun(司荣军). Study on 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.
[7] ECKHOFF R. Understanding dust explosions. The role of powder science and technology[J]. Journal of Loss Prevention in the Process Industries,2009,22(1):105-116.
[8] ADDAI E K,GABEL D,KRAUSE U. Experimental investigation on the minimum ignition temperature of hybrid mixtures of dusts and gases or solvents[J]. Journal of Hazardous Materials,2016,301(4):314-426.
[9] ZHONG Yingpeng(钟英鹏),XU Dong(徐冬),LI Gang(李刚),et al. Experimental test of minimum ignition temperature of magnesium dust cloud[J]. Explosion and Shock Waves(爆炸与冲击),2009,29(4):429-433.
[10] PANG Lei(庞磊),MA Ran(马冉),GAO Jiancun(高建村),et al. Particle size scale effect of minimum ignition temperature of dust cloud[J]. China Powder Science and Technology(中国粉体技术),2017,23(1):68-70.
[11] PANG Lei(庞磊),MA Ran(马冉),GAO Jiancun(高建村),et al. Effect of dust cloud concentration on minimum ignition temperature of HDPE dust cloud[J]. Journal of Safety Science and Technology(中国安全生产科学技术),2017,13(5):5-9.
[12] ZHAO Jiangping(赵江平),WAN Hangwei(万杭炜).Experimental study on minimum ignition temperature of mulberry dust[J]. China Safety Science Journal(中国安全科学学报),2017,27(12):26-31.
[13] WANG Qinghui(王庆慧),YUAN Shuai(袁帅),WEI Yuanmeng(卫园梦),et al. Study on factors affecting the minimum ignition temperature of corn starch dust cloud based on interactive orthogonal test[J]. Explosion and Shock Waves(爆炸与冲击),2018,36(2):1-7.
[14] REN Ruie(任瑞娥). Testing research on minimum ignition temperature of combustible dust(可燃粉尘最低着火温度的测试研究)[D]. Taiyuan:North University of China,2015.
[15] LI Runzhi(李润之). Study on the variation rule of minimum ignition temperature of different volatile coal dust layers[J]. Journal of Safety and Environment(安全与环境学报),2017,17(3):954-957.