煤矿井下气水喷雾雾化特性实验研究
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摘要
为了分析煤矿井下气水喷雾雾化特性,基于自行设计的气水喷雾实验平台,采用电磁流量计、空气质量流量计及马尔文实时高速喷雾粒度分析仪对空气雾化喷嘴流量特性、雾化粒度的空间分布规律及影响因素开展了实验研究。结果表明:随着供水压力的增加,喷嘴耗气量以指数形式不断递减,而耗水量以指数形式递增;喷嘴耗气量随供气压力以指数形式递增,而喷嘴耗水量基本呈现线性递减趋势。雾滴粒径沿喷嘴轴线方向不断增大;距离喷嘴较近的纵断面上,雾滴粒径沿径向不断增大,并呈现不对称分布;位于雾流中部的纵断面上,轴线附近区域雾滴粒径沿径向不断增大,而雾流外部区域雾滴粒径呈现沿重力方向增大的趋势;在靠近雾流末端衰减区内,雾滴粒径沿重力方向不断增大。供气压力一定时,雾滴粒径随着供水压力的增加呈现先增大后减小的变化规律,且供气压力越大所对应的拐点水压越高;随着供气压力的增加,雾滴粒径不断减小,且减小幅度随供气压力增加而有所下降。
In order to study the atomization characteristics of air-water spray in underground coal mine,the electromagnetic flowmeter,air-mass flowmeter and Malvern droplet particle size analyzer were used to make a systematic investigation on the nozzle flow characteristics and the spatial distribution law and influence factors of atomized particle size based on the experimental system designed by authors.The study results indicate that the water consumption of nozzle appears exponential growth with the increase of water supply pressure,and the air consumption decreases in the way of exponential.With the increase of air supply pressure,the air consumption of nozzle increases in the way of exponential,and the water consumption appears linearly decrease.The particle size of droplets increases with the distance away from nozzle in axial direction.On the longitudinal section near the nozzle,the particle size of droplets increases from inside to outside,and the particle size presents an asymmetric distribution.On the longitudinal section located in central spray flow,the particle size of droplets near the central axis increases with the distance away from the axis,and it presents anincrease trend along gravity direction in the outer domain of spray flow. In the attenuation zone of the spray flow,the particle size of droplets increases continuously along gravity direction. With the increase of water supply pressure,the particle size of droplets increases first and then declines slightly. The particle size of droplets decreases with the increase of air supply pressure,and the amplitude shows a decrease trend.
In order to study the atomization characteristics of air-water spray in underground coal mine,the electromagnetic flowmeter,air-mass flowmeter and Malvern droplet particle size analyzer were used to make a systematic investigation on the nozzle flow characteristics and the spatial distribution law and influence factors of atomized particle size based on the experimental system designed by authors.The study results indicate that the water consumption of nozzle appears exponential growth with the increase of water supply pressure,and the air consumption decreases in the way of exponential.With the increase of air supply pressure,the air consumption of nozzle increases in the way of exponential,and the water consumption appears linearly decrease.The particle size of droplets increases with the distance away from nozzle in axial direction.On the longitudinal section near the nozzle,the particle size of droplets increases from inside to outside,and the particle size presents an asymmetric distribution.On the longitudinal section located in central spray flow,the particle size of droplets near the central axis increases with the distance away from the axis,and it presents anincrease trend along gravity direction in the outer domain of spray flow. In the attenuation zone of the spray flow,the particle size of droplets increases continuously along gravity direction. With the increase of water supply pressure,the particle size of droplets increases first and then declines slightly. The particle size of droplets decreases with the increase of air supply pressure,and the amplitude shows a decrease trend.
引文
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[9]聂文,程卫民,周刚.综掘工作面压风气幕形成机理与阻隔效果分析[J].煤炭学报,2015,40(3):609-615.Nie Wen,Cheng Weimin,Zhou Gang.Formation mechanism of pressure air curtain and analysis of dust suppression’s effects in mechanized excavation face[J].Journal of China Coal Society,2015,40(3):609-615.
[10]Zhou Q C,Steve N.Research on numerical emulator of mine methane and coal dust explosion[J].Journal of Coal Science and Engineering(China),2008,14(3):447-452.
[11]程卫民,刘伟,聂文,等.煤矿采掘工作面粉尘防治技术及其发展趋势[J].山东科技大学学报(自然科学版),2010,29(4):77-82.Cheng Weimin,Liu Wei,Nie Wen,et al.The prevention and control technology of dusts in heading and winning faces and its development tendency[J].Journal of Shandong University of Science and Technology(Natural Science),2010,29(4):77-82.
[12]Nie Wen,Cheng Weimin,Han Li,et al.Simulation on dissolute and dust dispersion in comprehensive mechanized heading face with forced-exhaust ventilation[J].Journal of Coal Science and Engineering(China),2011,17(3):298-304.
[13]周刚,聂文,程卫民,等.煤矿综放工作面高压雾化降尘对粉尘颗粒微观参数影响规律分析[J].煤炭学报,2014,39(10):2053-2059.Zhou Gang,Nie Wen,Cheng Weimin,et al.Influence regulations analysis of high-pressure atomization dust-settling to dust particle’s microscopic parameters in fully mechanized caving coal face[J].Journal of China Coal Society,2014,39(10):2053-2059.
[14]吉晓莉,陈家炎,赵云惠.内混式空气雾化喷嘴的研究[J].武汉工业大学学报,1998,20(3):47-49.Ji Xiaoli,Chen Jiayan,Zhao Yunhui.Study on internal blend airblast atomizer[J].Journal of Wuhan University of Technology,1998,20(3):47-49.
[15]郑斌,姬丽霞,路春美,等.电厂SCR空气雾化喷嘴的雾化特性研究[J].环境工程,2009,27(3):79-86.Zheng Bin,Ji Lixia,Lu Chunmei,et al.Study on atomization characteristics of the SCR airblast atomizer in electric power plant[J].Environment Engineering,2009,27(3):79-86.
[16]Anubhav Sinha,R Surya Prakash,A Madan Mohan,et al.Airblast spray in crossflow-structure,trajectory and droplet sizing[J].International Journal of Multiphase Flow,2015,72(1):97-113.
[17]Ma Rui,Dong Bo,Yu Zhongqiang,et al.An experimental study on the spray characteristics of the air-blast atomizer[J].Applied Thermal Engineering,2015,88(12):149-156.
[18]Raj Mohan B,Jain R K,Meikap B C.Comprehensive analysis for prediction of dust removal efficiency using twin-fluid atomization in a spray scrubber[J].Separation and Purification Technology,2008,63(5):269-277.
[19]曹建明,朱辉,郭广祥,等.空气助力改善液滴雾化质量的研究[J].实验流体力学,2013,27(1):56-60,87.Cao Jianming,Zhu Hui,Guo Guangxiang,et al.Study on assistant to improve quality of droplet atomization[J].Journal of Experiments in Fluid Mechanics,2013,27(1):56-60,87.
[20]侯腾彦,高贵军,刘邱祖.矿用风水雾化器液滴破碎机理及其降尘效率研究[J].矿山机械,2014(7):132-135.Hou Tengyan,Gao Guijun,Liu Qiuzu.Study on droplet breakup mechanism and dust-fall efficiency of mine wind-water atomizer[J].Mine Machinery,2014(7):132-135.
[21]句海洋,凌标灿,彭驰,等.综掘工作面机载气水两相喷雾装置的应用[J].煤炭工程,2015,47(4):131-133.Ju Haiyang,Ling Biaocan,Peng Chi,et al.Application of waterair two-phase spray device on coal shearer in fully mechanized tunneling working site[J].Coal Engineering,2015,47(4):131-133.
[22]李瑞升,宋召谦.采掘面风水喷雾降尘技术试验与应用[J].山东煤炭科技,2004,22(2):30-32.Li Ruisheng,Song Zhaoqian.Experiment and application of the technology of air-water spray and dust suppression[J].Shandong Coal Science and Technology,2004,22(2):30-32.
[23]刘联胜,傅茂林,吴晋湘,等.气泡雾化喷嘴喷雾平均直径在下游流场中的分布[J].工程热物理学报,2001,22(5):653-656.Liu Liansheng,Fu Maolin,Wu Jinxiang,et al.The distribution of SMD downstream the discharge orifices of effervescent atomizers[J].Journal of Engineering Thermophysics,2001,22(5):653-656.
[2]时训先,蒋仲安,周姝嫣,等.综采工作面粉尘分布规律的实验研究[J].煤炭学报,2008,33(10):1117-1121.Shi Xunxian,Jiang Zhong’an,Zhou Shuyan,et al.Experimental study on dust distribution regularity of fully mechanized mining face[J].Journal of China Coal Society,2008,33(10):1117-1121.
[3]时训先,蒋仲安,褚燕燕.煤矿综采工作面防尘技术研究现状及趋势[J].中国安全生产科学技术,2005,1(1):41-43.Shi Xunxian,Jiang Zhong’an,Chu Yanyan.Current development an trend of dust control technology research of fully mechanized coal faces[J].Journal of Safety Science and Technology,2005,1(1):41-43.
[4]Wang Pengfei,Feng Tao,Liu Roughua.Numerical simulation study on the dust distribution of full-mechanized face under the isolation effect of air curtain[J].Mining Science and Technology,2011,21(1):65-69.
[5]徐厚学,施国华,郑彦奎.综采面采煤机割煤粉尘分布特性及防治技术[J].煤矿安全,2013,44(3):75-77.Xu Houxue,Shi Guohua,Zheng Yankui.Distribution characteristics of dust produced in cutting coal and prevention technology at fully-mechanized coal face[J].Journal of Coal Mine Safety,2013,44(3):75-77.
[6]陈贵,王德明,王和堂,等.大断面全岩巷综掘工作面泡沫降尘技术[J].煤炭学报,2012,37(11):1859-1864.Chen Gui,Wang Deming,Wang Hetang,et al.The technology of controlling dust with foam for fully mechanized excavation face of large cross-section rock tunnel[J].Journal of China Coal Society,2012,37(11):1859-1864.
[7]程卫民,聂文,姚玉静,等.综掘工作面旋流气幕抽吸控尘流场的数值模拟[J].煤炭学报,2011,36(8):1342-1348.Cheng Weimin,Nie Wen,Yao Yujing,et al.Numerical simulation on the flow field of swirling flow air curtain aspiration control dust in fully mechanized workface[J].Journal of China Coal Society,2011,36(8):1342-1348.
[8]王鹏飞,刘荣华,汤梦,等.煤矿井下高压喷雾雾化特性及其降尘效果实验研究[J].煤炭学报,2015,40(9):2124-2130.Wang Pengfei,Liu Ronghua,Tang Meng,et al.Experimental study on atomization characteristics and dust suppression efficiency of highpressure spray in underground coal mine[J].Journal of China Coal Society,2014,40(9):2124-2130.
[9]聂文,程卫民,周刚.综掘工作面压风气幕形成机理与阻隔效果分析[J].煤炭学报,2015,40(3):609-615.Nie Wen,Cheng Weimin,Zhou Gang.Formation mechanism of pressure air curtain and analysis of dust suppression’s effects in mechanized excavation face[J].Journal of China Coal Society,2015,40(3):609-615.
[10]Zhou Q C,Steve N.Research on numerical emulator of mine methane and coal dust explosion[J].Journal of Coal Science and Engineering(China),2008,14(3):447-452.
[11]程卫民,刘伟,聂文,等.煤矿采掘工作面粉尘防治技术及其发展趋势[J].山东科技大学学报(自然科学版),2010,29(4):77-82.Cheng Weimin,Liu Wei,Nie Wen,et al.The prevention and control technology of dusts in heading and winning faces and its development tendency[J].Journal of Shandong University of Science and Technology(Natural Science),2010,29(4):77-82.
[12]Nie Wen,Cheng Weimin,Han Li,et al.Simulation on dissolute and dust dispersion in comprehensive mechanized heading face with forced-exhaust ventilation[J].Journal of Coal Science and Engineering(China),2011,17(3):298-304.
[13]周刚,聂文,程卫民,等.煤矿综放工作面高压雾化降尘对粉尘颗粒微观参数影响规律分析[J].煤炭学报,2014,39(10):2053-2059.Zhou Gang,Nie Wen,Cheng Weimin,et al.Influence regulations analysis of high-pressure atomization dust-settling to dust particle’s microscopic parameters in fully mechanized caving coal face[J].Journal of China Coal Society,2014,39(10):2053-2059.
[14]吉晓莉,陈家炎,赵云惠.内混式空气雾化喷嘴的研究[J].武汉工业大学学报,1998,20(3):47-49.Ji Xiaoli,Chen Jiayan,Zhao Yunhui.Study on internal blend airblast atomizer[J].Journal of Wuhan University of Technology,1998,20(3):47-49.
[15]郑斌,姬丽霞,路春美,等.电厂SCR空气雾化喷嘴的雾化特性研究[J].环境工程,2009,27(3):79-86.Zheng Bin,Ji Lixia,Lu Chunmei,et al.Study on atomization characteristics of the SCR airblast atomizer in electric power plant[J].Environment Engineering,2009,27(3):79-86.
[16]Anubhav Sinha,R Surya Prakash,A Madan Mohan,et al.Airblast spray in crossflow-structure,trajectory and droplet sizing[J].International Journal of Multiphase Flow,2015,72(1):97-113.
[17]Ma Rui,Dong Bo,Yu Zhongqiang,et al.An experimental study on the spray characteristics of the air-blast atomizer[J].Applied Thermal Engineering,2015,88(12):149-156.
[18]Raj Mohan B,Jain R K,Meikap B C.Comprehensive analysis for prediction of dust removal efficiency using twin-fluid atomization in a spray scrubber[J].Separation and Purification Technology,2008,63(5):269-277.
[19]曹建明,朱辉,郭广祥,等.空气助力改善液滴雾化质量的研究[J].实验流体力学,2013,27(1):56-60,87.Cao Jianming,Zhu Hui,Guo Guangxiang,et al.Study on assistant to improve quality of droplet atomization[J].Journal of Experiments in Fluid Mechanics,2013,27(1):56-60,87.
[20]侯腾彦,高贵军,刘邱祖.矿用风水雾化器液滴破碎机理及其降尘效率研究[J].矿山机械,2014(7):132-135.Hou Tengyan,Gao Guijun,Liu Qiuzu.Study on droplet breakup mechanism and dust-fall efficiency of mine wind-water atomizer[J].Mine Machinery,2014(7):132-135.
[21]句海洋,凌标灿,彭驰,等.综掘工作面机载气水两相喷雾装置的应用[J].煤炭工程,2015,47(4):131-133.Ju Haiyang,Ling Biaocan,Peng Chi,et al.Application of waterair two-phase spray device on coal shearer in fully mechanized tunneling working site[J].Coal Engineering,2015,47(4):131-133.
[22]李瑞升,宋召谦.采掘面风水喷雾降尘技术试验与应用[J].山东煤炭科技,2004,22(2):30-32.Li Ruisheng,Song Zhaoqian.Experiment and application of the technology of air-water spray and dust suppression[J].Shandong Coal Science and Technology,2004,22(2):30-32.
[23]刘联胜,傅茂林,吴晋湘,等.气泡雾化喷嘴喷雾平均直径在下游流场中的分布[J].工程热物理学报,2001,22(5):653-656.Liu Liansheng,Fu Maolin,Wu Jinxiang,et al.The distribution of SMD downstream the discharge orifices of effervescent atomizers[J].Journal of Engineering Thermophysics,2001,22(5):653-656.
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