Citation

Jing D, Wang Z, Ge S, Zhang T, Ren S, Jia X. China Saf. Sci. J. 2022; 32(11): 82-89.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2022.11.2718

PMID

unavailable

Abstract

In order to solve the problem of dust pollution in the coal mine, a new ultra-fine spiral atomization nozzle with small droplet size and strong dust-falling ability was developed according to the principle of gas-water spray and the characteristics of vortex airflow generation. Firstly, the numerical simulation software was used to simulate the velocity and streamline distribution characteristics of the airflow field inside the airflow guide under different parameters, and the optimal spiral effect parameters of the airflow guide were obtained. Then, an experimental platform was built to determine the performance parameters of the ultra-fine spiral atomization nozzle. Finally, through the comparative test of ultrasonic dry fog dust suppression efficiency,the dust suppression performance of the ultra-fine spiral atomizing nozzle was studied, and a set of high-efficiency dust removal facilities was deigned and applied to the 06 return airway of Mindong No.1 mine. The results show that when the angle α between the spiral groove and the conical wall is α = 30° and the ratio of the top surface diameter of the airflow guide to the height d is 1. 25, the directional air flow spiral effect of the air flow guide is the best. When the spray pressure is 0. 4 MPa, the atomization angle of the ultra-fine spiral atomization nozzle is the largest, and the diameter of fog droplets, which account for 90% of the number of droplets, is less than 19. 7 μm, and the comprehensive atomization performance is the best. At this time, the total dust reduction efficiency is 92. 18%, which is 10. 21% higher than that of ultrasonic dry fog dust suppression. The dust removal efficiency of the full-section spiral pneumaticfog curtain with ultra-fine spiral atomizing nozzles as the core is 88. 8%-91. 58%. © 2022 China Safety Science Journal. All rights reserved.

Language: zh