受限空间沉积粉尘二次飞扬特征及数值分析
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摘要
为得到井工煤矿巷道内沉积粉尘二次扬尘运动特征,以梯形体沉积粉尘三维模型为研究对象,对环境风速、密度、粒径、含水率等4因素条件下扬尘分布进行研究,并采用CFD数值模拟与现场测定方法对实验准确性进行验证.研究结果表明:受限空间内环境风速是影响沉积粉尘的二次飞扬的主要因素;风速的增加改变了粉尘扩散的分布趋势;通过增大含水率,造成扬尘量显著降低,证明含水率的改变与扬尘量呈现出负指数变化;实验结果与数值模拟和现场实测数据较为吻合,该方法能准确研究粉尘的二次飞扬特征.
In order to obtain the secondary fugitive dust movement characteristics of the deposition dust in coal mining roadway, the three dimensional model of trapezoidal deposition dust was taken as the research object and the dust distribution under the four factors of ambient wind speed, density, particle size and water content was studied, and the CFD numerical simulation and field measurements data were used to verify the model accuracy. The results show that the ambient wind speed is the main factor affecting the secondary dust emission in confined space; Increasing of wind speed changes distribution trend of dust dispersion; By increasing the moisture content of dust, the amount of fugitive dust is significantly reduced, which proved that the change of moisture content and the secondary dust characteristics showed a inverse relation;The error between the three measurements data results are less in experimental conditions indicating that the method can more accurately describe the characteristics of secondary fugitive dust emission.
In order to obtain the secondary fugitive dust movement characteristics of the deposition dust in coal mining roadway, the three dimensional model of trapezoidal deposition dust was taken as the research object and the dust distribution under the four factors of ambient wind speed, density, particle size and water content was studied, and the CFD numerical simulation and field measurements data were used to verify the model accuracy. The results show that the ambient wind speed is the main factor affecting the secondary dust emission in confined space; Increasing of wind speed changes distribution trend of dust dispersion; By increasing the moisture content of dust, the amount of fugitive dust is significantly reduced, which proved that the change of moisture content and the secondary dust characteristics showed a inverse relation;The error between the three measurements data results are less in experimental conditions indicating that the method can more accurately describe the characteristics of secondary fugitive dust emission.
引文
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[14]荆德吉,葛少成,刘剑.基于欧拉-欧拉模型的落煤塔控尘技术研究[J].中国安全科学学报,2012,22(10):126-132.JING Deji,GE Shaocheng,LIU Jian.Study on control technology of dust at coal drop tower based on eulerian-eulerian model[J].China Safety Science Journal,2012,22(10):126-132.
[15]荆德吉,葛少成.闭环回旋控尘技术的三维数值模拟研究[J].中国安全生产科学技术,2015,11(3):79-84.JING Deji,GE Shaocheng.Study on 3D numerical simulation of closed-loop dust control technology[J].Journal of Safety Science and Technology,2015,11(3):79-84.
[2]朱传杰,林柏泉,江丙友,等.基于欧拉-欧拉方法的冲击波扬尘特征及其影响因素[J].中国矿业大学学报,2012,41(5):733-738.ZHU Chuanjie,LIN Boquan,JIANG Bingyou,et al.Dust lifting behind a shock wave.Analysis based on the E-E method[J].Journal of China University of Mining&Technology,2012,41(5):733-738.
[3]荆德吉,葛少成,刘剑,等.破碎站粉尘逸散规律及降尘技术的数值模拟及其应用[J].环境工程学报,2013,7(9):3 494-3 500.JING Deji,GE Shaocheng,LIU Jian,et al.Numerical simulation of dust diffusion rule and suppression technology in crushing station and its application[J].Chinese Journal of Environmental Engineering,2013,7(9):3 494-3 500.
[4]王晓珍,蒋仲安,王善文,等.煤巷掘进过程中粉尘浓度分布规律的数值模拟[J].煤炭学报,2007(4):386-390.WANG Xiaozhen,JIANG Zhongan,WANG Shanwen,et al.Numerical simulation of distribution regularities of dust concentration during the ventilation process of coal roadway driving[J].Journal of China Coal Society,2007(4):386-390.
[5]J Mo,L Wang,W Au,M Su.Prevalence of coal workers’pneumoconiosis in China:A systematic analysis of 2001-2011 studies[J].International Journal of Hygiene and Environmental Health,2014,217(1):46-51.
[6]张超光,蒋军成,郑志琴.粉尘爆炸事故模式及其预防研究[J].中国安全科学学报,2005(6):73-76,115.ZHANG Chaoguang,JIANG Juncheng,ZHENG Zhiqin.Study on the mode and prevention of dust explosion accident[J].China Safety Science Journal,2005(6):73-76,115.
[7]段振伟,李志强,景国勋.直线管道煤尘爆炸火焰传播规律的试验研究[J].中国安全科学学报,2012,22(3):103-108.DUAN Zhenwei,LI Zhiqiang,JING Guoxun.Experimental study on propagation of coal dust explosion flame in straight pipe[J].China Safety Science Journal,2012,22(3):103-108.
[8]丛晓春,陈志龙,詹水芬.露天煤场静态起尘量的实验研究[J].中国矿业大学学报,2010,39(6):849-853.CONG Xiaochun,CHEN Zhilong,ZHAN Shuifen.Experimental study of static dust emission from a coal pile in the open air yard[J].Journal of China University of Mining&Technology,2010,39(6):849-853.
[9]谭聪,蒋仲安,王明,等.综放工作面多尘源粉尘扩散规律的相似实验[J].煤炭学报,2015,40(1):122-127.TAN Cong,JIANG Zhongan,WANG Ming,et al.Similarity experiment on multi-source dust diffusion law in fully mechanized caving face[J].Journal of China Coal Society,2015,40(1):122-127.
[10]聂文,程卫民,陈连军,等.旋流风幕扰动硬岩综掘面风-尘流场数值模拟[J].中国安全科学学报,2014,24(3):120-125.NIE Wen,CHENG Weimin,CHEN Lianjun.et al.Numerical simulation of swirl air curtain disturbed air-dust flowing field at hard rock fully mechanized workface[J].China Safety Science Journal,2014,24(3):120-125.
[11]董子文,齐庆杰,于文惠,等.无轨胶轮车行驶巷扬尘影响因素数值模拟[J].中国安全科学学报,2015(10):146-152.DONG Ziwen,QI Qingjie,YU Wenhui,et al.Numerical simulation of factors influencing fugitive dust caused by trackless rubber tire vehicle running in roadway[J].China Safety Science Journal,2015(10):146-152.
[12]胡传新,白景峰,薛永华.紊流度对煤炭颗粒起动和来流风速影响研究[J].中国矿业大学学报,2016,45(1):189-194.HU Chuanxin,BAI Jingfeng,XUE Yonghua.Influence research of turbulence intensity on threshold and on-coming flow velocity of coal-dust particle[J].Journal of China University of Mining&Technology,2016,45(1):189-194.
[13]韩桂波,詹水芬,张晓春,等.煤炭粉尘颗粒起动风速影响因素及数学模型[J].煤炭学报,2009,34(10):1 359-1 363.HAN Guiho,ZHAN Shuifen,ZHANG Xiaochun,et al.Influence factors and mathematical model of coal dust particles threshold velocity[J].Journal of China Coal Society,2009,34(10):1 359-1 363.
[14]荆德吉,葛少成,刘剑.基于欧拉-欧拉模型的落煤塔控尘技术研究[J].中国安全科学学报,2012,22(10):126-132.JING Deji,GE Shaocheng,LIU Jian.Study on control technology of dust at coal drop tower based on eulerian-eulerian model[J].China Safety Science Journal,2012,22(10):126-132.
[15]荆德吉,葛少成.闭环回旋控尘技术的三维数值模拟研究[J].中国安全生产科学技术,2015,11(3):79-84.JING Deji,GE Shaocheng.Study on 3D numerical simulation of closed-loop dust control technology[J].Journal of Safety Science and Technology,2015,11(3):79-84.
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