供水压力对气水喷雾雾化特性及降尘效果的影响
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摘要
为了掌握供水压力对气水喷雾雾化特性及降尘效果的影响,基于自主研发的气水喷雾降尘实验平台,对不同供水压力下的气水喷雾喷嘴流量、雾化特性参数及降尘效率进行了测定.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;喷嘴雾化射程和雾滴体积浓度均随着供水压力的增加而增大,而雾化角先增大后减小;随着供水压力的增加,雾滴粒径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供水压力越高;随着供水压力的增加,气水喷雾对全尘和呼吸性粉尘的降尘效率均呈现先升高后降低的变化规律;气水喷雾对不同粒径粉尘的降尘效率存在差异,分级效率随着粉尘粒径的增加呈现先增大后减小的变化规律;气水喷雾分级效率存在一峰值,位于峰值粒径区域的粉尘保持较高的降尘效率,峰值粒径与雾滴粒径保持相同的变化趋势.在矿山采掘工作业场所进行气水喷雾降尘时,供水压力即不能过高也不能过低,为确保全尘和呼吸性粉尘的降尘效率,应选择接近且略高于供气压力的供水压力.
In order to master the influence of water supply pressure on the atomization characteristics and dust-settling efficiency of air-water spray in underground,based on experimental system designed by authors for air-water spray,the nozzle flow,spray performance parameters and dustsettling efficiency of air-water were measured under different water supply pressure. 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 water supply pressure,the spray range and droplet volume concentration of air atomizing nozzle both increase,but the spray angle increases first and then decreases. With the increase of water supply pressure,the particle size of droplets increases first and then declines slightly,and the inflection pressure raises as the air supply pressure increase. The efficiencies of reducing total dust and respirable dust both increase first and then decrease as the water supply pressure rises. There are differences in dust-settling efficiency for the dust with different particle size,the classification efficiency raises first and then declines as the particle size increases. There is a classification efficiency peak,the dust in the area of peak particle size has high dust-settling efficiency,and the peak particle size keep similar variation trend with droplet size. The water supply pressure should not be too high and too low,the water supply pressure close to and slightly above the air supply pressure should be selected,which can insure the dust-settling efficiency of total dust and respirable dust.
In order to master the influence of water supply pressure on the atomization characteristics and dust-settling efficiency of air-water spray in underground,based on experimental system designed by authors for air-water spray,the nozzle flow,spray performance parameters and dustsettling efficiency of air-water were measured under different water supply pressure. 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 water supply pressure,the spray range and droplet volume concentration of air atomizing nozzle both increase,but the spray angle increases first and then decreases. With the increase of water supply pressure,the particle size of droplets increases first and then declines slightly,and the inflection pressure raises as the air supply pressure increase. The efficiencies of reducing total dust and respirable dust both increase first and then decrease as the water supply pressure rises. There are differences in dust-settling efficiency for the dust with different particle size,the classification efficiency raises first and then declines as the particle size increases. There is a classification efficiency peak,the dust in the area of peak particle size has high dust-settling efficiency,and the peak particle size keep similar variation trend with droplet size. The water supply pressure should not be too high and too low,the water supply pressure close to and slightly above the air supply pressure should be selected,which can insure the dust-settling efficiency of total dust and respirable dust.
引文
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[18]王鹏飞,程卫民,周刚,等.供气压力对煤矿井下气水喷雾降尘的影响[J].煤炭学报,2016,41(增刊1):137-143Wang Pengfei,Cheng Weimin,Zhou Gang,et al. Influence of air supply pressure on the air-water spraying dust-settling in underground coal mine[J]. Journal of China Coal Society,2016,41(suppl 1):137-143
[19]宋文超,阚景文,王明,等.气水喷雾降尘系统在采煤机上的应用研究[J].工业安全与环保,2015,41(8):60-64Song Wenchao,Han Jingwen,Wang Ming,et al. Study on application of gas-water spraying dust suppression system in coal mining machines[J]. Industrial Safety and Environment Protection,2015,41(8):60-64
[20]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):131-133Ju Haiyang,Ling Biaocan,Peng Chi,et al. Application of water-air two-phase spray device on coal shearer in fully mechanized tunneling working site[J]. Coal Engineering,2015,47(4):131-133
[21]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):30-32Li Ruisheng,Song Zhaoqian. Experiment and application of the technology of air-water spray and dust suppression[J].Science and Technology of Shandong Coal,2004,22(2):30-32
[22]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):653-656Liu 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):1117-1121Shi 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]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):609-615Nie 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
[4] Zhou Gang,Zhang Qi,Bai Ruonan,et al. Characterization of coal micro-pore structure and simulation on the seepage rules of low-pressure water based on CT scanning data[J]. Minerals,2016,6(3):1-16
[5] Wang Pengfei,Feng Tao,Liu Ronghua. 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
[6] 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
[7]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):2053-2059Zhou 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
[8]程卫民,周刚,左前明,等.喷嘴喷雾压力与雾化粒度关系的实验研究[J].煤炭学报,2010,35(8):1308-1313Cheng Weimin,Zhou Gang,Zuo Qianming,et al. Experimental research on the relationship between nozzle spray pressure and atomization particle size[J]. Journal of China Coal Society,2010,35(8):1308-1313
[9]马素平,寇子明.喷雾降尘效率与喷雾参数匹配研究[J].中国安全科学学报,2006,16(5):84-89Ma Suping,Kou Ziming. Study of efficiency of dust suppression by mist spray and its matched parameters[J]. China Safety Science Journal,2006,16(5):84-89
[10] 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
[11] Dariusz Prostanski. Using of air-water spraying systems for improving dust control in mines[J]. Journal of Sustainable Mining,2013,12(2):29-34
[12]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):56-60,87Cao 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
[13] 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
[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):47-49Ji 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):79-86Zheng 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]蒋仲安,王明,陈举师,等.气水喷嘴雾化特征及降尘效果分析[J].哈尔滨工业大学学报,2017,49(2):151-157Jiang Zhong'an,Wang Ming,Chen Jushi,et al. Atomization characteristics and dust suppression mechanism of a gaswater nozzle[J]. Journal of Harbin Institute of Technology,2017,49(2):151-157
[17]王鹏飞,刘荣华,桂哲,等.煤矿井下气水喷雾雾化特性及降尘效率理论研究[J].煤炭学报,2016,41(9):2256-2272Wang Pengfei,Liu Ronghua,Gui Zhe,et al. Theoretical research on atomization characteristics and dust suppression efficiency of air-water spray in underground coal mine[J]. Journal of China Coal Society,2016,41(9):2256-2272
[18]王鹏飞,程卫民,周刚,等.供气压力对煤矿井下气水喷雾降尘的影响[J].煤炭学报,2016,41(增刊1):137-143Wang Pengfei,Cheng Weimin,Zhou Gang,et al. Influence of air supply pressure on the air-water spraying dust-settling in underground coal mine[J]. Journal of China Coal Society,2016,41(suppl 1):137-143
[19]宋文超,阚景文,王明,等.气水喷雾降尘系统在采煤机上的应用研究[J].工业安全与环保,2015,41(8):60-64Song Wenchao,Han Jingwen,Wang Ming,et al. Study on application of gas-water spraying dust suppression system in coal mining machines[J]. Industrial Safety and Environment Protection,2015,41(8):60-64
[20]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):131-133Ju Haiyang,Ling Biaocan,Peng Chi,et al. Application of water-air two-phase spray device on coal shearer in fully mechanized tunneling working site[J]. Coal Engineering,2015,47(4):131-133
[21]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):30-32Li Ruisheng,Song Zhaoqian. Experiment and application of the technology of air-water spray and dust suppression[J].Science and Technology of Shandong Coal,2004,22(2):30-32
[22]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):653-656Liu 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