Citation

Luo Z, Wang Z, Su B, Li K, Shi J. China Saf. Sci. J. 2020; 30(4): 1-7.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.04.001

PMID

unavailable

Abstract

In order to investigate influence of multi-component combustible gases on explosion characteristics of CH4 in fire area of mines, a 20 L multifunctional spherical gas explosion device was used for experiments to collect explosion pressure parameters. Then, emission spectra of key free radicals OH∗ and CH2O∗ of CH4 explosion were obtained through a digital oscilloscope. Finally, influence of multi-component combustible gases on explosion characteristics of CH4 was analyzed from macro and micro aspects, and they were correlated and compared. The research shows that their influence indicates different characteristics due to different oxygen contents. An increase in multi-component combustible gas content under an oxygen-depleted state can inhibit explosion of CH4. But its inhibition effect gradually weakens as oxygen content increases until an oxygen-rich state is reached. Relative intensity of key radical emission spectra is basically consistent with corresponding changes of explosion pressure parameters. Although different radicals have the same change trend in participating in reaction process, they are affected by oxygen content to different degrees, and CH2O∗, compared with OH∗, is more susceptible to oxygen content during the process. © 2019 China Safety Science Journal

Language: zh