Citation

Jing D, Jia X, Zhang T, Meng X, Ma M, Wang Z. China Saf. Sci. J. 2021; 31(6): 121-127.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.06.016

PMID

unavailable

Abstract

In order to control dust in the process of coal falling, based on generation mechanism of vortex and migration feature of dust particles in vortex airflow field, a vortex blowing-suction dust removal technology was put forward to control dust dispersion during coal falling. Then, with a coal falling tower as an example, numerical simulation was used to analyze variance law of airflow field. Finally, a simulation experiment model was built, optimal vortex performance of devices was studied, and dust removal performance of proposed technology was compared with that of single suction one. The results show that vortex airflow is formed during coal falling process, and most of dust particles are collected by vortex, migrating bottom-up in a spiral pattern. Vortex performance will be the best at an optimal blowing ratio of 4. 814. And dust removal performance of vortex blowing-suction dedusting technology is better than that of single one, with dust collection concentration per unit time being 314. 27 and 191. 94mg/ m3, dust removal efficiency of 93. 25% and 41. 19%, and escape rate of 6. 31% and 46. 60% respectively. © 2021 China Safety Science Journal. All rights reserved.

Language: zh