Experimental study on atomization characteristics and dust-reduction performance of four common types of pressure nozzle
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Experimental study on atomization characteristics and dustreduction performance of four common types of pressure nozzles in underground coal mines Han Han1 • Pengfei Wang2,3
•
Ronghua Liu1 • Chang Tian1
Received: 12 October 2019 / Revised: 20 April 2020 / Accepted: 11 May 2020 The Author(s) 2020
Abstract Pressure nozzle is commonly used in the dust-reduction techniques by spraying of underground coal mines. Based on the internal structure, the pressure nozzle can be divided into the following types: spiral channel nozzle, tangential flow-guided nozzle and X-swirl nozzle. In order to provide better guidance on the selection of nozzles for the coal mine dust-reduction systems by spraying, we designed comparing experiments to study the atomization characteristics and dust-reduction performance of four commonly used nozzles in the coal mine underground with different internal structures. From the experimental results on the atomization characteristics, both the tangential flow-guided nozzle and the X-swirl nozzle have high flow coefficients. The atomization angle is the largest in the spiral non-porous nozzle, and smallest in both the X-swirl nozzle and the spiral porous nozzle. The spraying range and the droplet velocity are inversely proportional to the atomization angle. When the water pressure is low, the atomization performance of the spiral nonporous nozzle is the best among the four types of nozzles. The atomization performance of the X-swirl nozzle is superior to other types when the water pressure is high. Under the high water pressure, the particle size of the atomized droplets is smallest in the X-swirl nozzle. Through the experiments on the dust-reduction performance of the four types of nozzles and the comprehensive analysis, the X-swirl nozzle is recommended for the coal mine application site with low water pressure in the dust-reduction system, while at the sites with high water pressure, the spiral non-porous nozzle is recommended, which has the lowest water consumption and obvious economic advantages. Keywords Pressure nozzle Atomization characteristics Dust-reduction performance Droplets Dust
1 Introduction
& Pengfei Wang [email protected] 1
Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China
2
School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
3
Department of Civil and Architectural Engineering and Mechanic, University of Arizona, Tucson, AZ 85721, USA
A large amount of dust is generated in the coal mine production fields such as mining, tunneling, transport, etc. (Wang et al. 2019; Luo et al. 2017). The health condition and life safety of the coal mine workers, who work in the environments with high-concentration dust for a long time, are seriously threatened (Zhang et al. 2018; Reed et al. 2018; Zhou et al. 2017). At present, the spraying technology for dust reduction has been widely applied in coal
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