Spray characteristics and dust removal efficiency of internal- mixing air atomizing nozzle

被引：0
|
作者：
Wang P. [1 ,3 ]
Li Y. [2 ]
Liu R. [2 ,3 ]
Tan X. [2 ]
Tian C. [2 ]
机构：
[1] Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science & Technology, Xiangtan
[2] School of Resource, Environment & Safety Engineering, Hunan University of Science & Technology, Xiangtan
[3] Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science & Technology, Xiangtan
来源：
Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷 / 05期
关键词：
Air atomizing; Atomization characteristics; Dust removal efficiency; Pressure nozzle;
D O I：
10.13225/j.cnki.jccs.2018.0488
中图分类号：
学科分类号：
摘要：
In order to study the spray characteristics and dust removal properties of internal-mixing air atomizing nozzle, based on the experimental platform designed by authors for spray and dust removal, the dust removal efficiencies and spray performance parameters of the internal-mixing air atomizing nozzle and the X-type swirl pressure nozzle were measured. The spray performance parameters measured in the experiment include flow rate, droplet size, droplet volume concentration, spray angle and droplet velocity. The study results indicate that the water flow rate of air atomizing nozzle appears exponential growth with the increase of water supply pressure, and the air flow rate decreases in the way of exponential. The air-liquid mass flow ration (ALR) decreases with the increase of water supply pressure. For the pressure nozzle, the water flow rate increases with the increase of the water supply pressure, and the water flow rate is proportional to the square root of water pressure. With the increase of water supply pressure, the spray range, droplet volume concentration and droplet velocity of two kinds of nozzle all increase. The atomization angle of swirl pressure nozzle is significantly larger than that of air atomizing nozzle, which has wider coverage. As the water supply pressure increases, the atomization angle of atomizing nozzle increases first and then decreases, and it decreases continuously at a modest pace for the X-type swirl pressure nozzle. With the help of compressed air, the atomizing nozzle can acquire the ideal droplet size under low water pressure, and the droplet size increases with the increase of the water supply pressure. For the pressure nozzle, the droplet size shows a change rule of decreasing with the further increase of the water supply pressure, only when the water pressure is high can reach the appropriate droplet size. Under the same water pressure, the droplet size and water flow rate of air atomizing nozzle are both less than those of pressure nozzle, but the droplet volume concentration, droplet velocity and dust removal efficiency are all higher than those of pressure nozzle. Compared with the pressure spray, the air-water spray has a significant advantage. For the same dust removal efficiency, the water consumption of air-water spray is merely half of those of pressure spray. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.
引用
收藏
页码：1570 / 1579
页数：9
相关论文
共 20 条
  • [1] Nie W., Peng H., Jin H., Et al., The effect of spray pressure on atomization characteristics of external spray nozzle on coal mining machine, Journal of China University of Mining & Technology, 46, 1, pp. 41-47, (2017)
  • [2] Zhou F., Li J., Li S., Et al., Experimental investigation and application of dry-type filtering dust collection technology in fully mechanized excavation face, Journal of China Coal Society, 42, 3, pp. 639-645, (2017)
  • [3] Zhou G., Zhang Q., Cheng W., Et al., Numerical simulation on gunite dust of bolt-shotcrete operating area in coal mine and development of new wet spraying integral machine, Journal of Central South University(Science and Technology), 47, 2, pp. 606-614, (2016)
  • [4] Zhou G., Zhang Q., Bai R., Et al., Characterization of coal micro-pore structure and simulation on the seepage rules of low-pressure water based on CT scanning data, Minerals, 6, 3, pp. 1-16, (2016)
  • [5] Nie W., Cheng W., Han L., Et al., Simulation on dissolute and dust dispersion in comprehensive mechanized heading face with forced-exhaust ventilation, Journal of Coal Science and Engineering, 17, 3, pp. 298-304, (2011)
  • [6] Xu M., Liu X., Wen X., Full-mechanized excavation face efficient sprinkler & dust fall system, Journal of Hunan University of Science & Technology (Natural Science Edition), 30, 2, pp. 1-7, (2015)
  • [7] Wang P., Cheng W., Zhou G., Et al., Influence of air supply pressure on the air-water spraying dust-settling in underground coal mine, Journal of China Coal Society, 41, pp. 137-143, (2016)
  • [8] Jiang Z., Wang M., Chen J., Et al., Atomization characteristics and dust suppression mechanism of a gas-water nozzle, Journal of Harbin Institute of Technology, 49, 2, pp. 151-157, (2017)
  • [9] Dariusz P., Using of air-water spraying systems for improving dust control in mines, Journal of Sustainable Mining, 12, 2, pp. 29-34, (2013)
  • [10] Rui M., Bo D., Zhong Q., Et al., An experimental study on the spray characteristics of the air-blast atomizer, Applied Thermal Engineering, 88, 12, pp. 149-156, (2015)
12