Citation

Fan S, Chen S, He W, Tian F, Liu C, Liu G. China Saf. Sci. J. 2022; 32(3): 158-166.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.03.022

PMID

unavailable

Abstract

In order to effectively improve the efficiency of heat and wet energy extraction from mine exhaust, effects of nozzle atomization pressure and airflow speed on up-spray droplet group's characteristic particle size and dispersed phase fraction were tested by using Malvern laser particle size analyzer in the mine exhaust heat and humidity extraction device with upper spray type, and data of 21 engineering conditions were tested and collected. Then, influence of nozzle operation parameters and exhaust airflow mechanical parameters on dispersed phase fraction of droplet groups was determined by using critical Weber number and ligament diameter calculation formula. Finally, a single droplet's migration correlation with droplet group characteristic particle size was derived by introducing dispersed phase fraction. The results show that the primary breakage type of liquid film is linear instability breakage with long wavelength. When nozzles' atomizing pressure increases, particle size of liquid droplets decreases while fraction of dispersed phase increases. The resistance coefficient increases with the introduction of dispersed phase fraction, which has a quasi-lubrication effect on droplet migration. © 2022 China Safety Science Journal. All rights reserved.

Language: zh