Application of three-phase foam in extinguishing spontaneous combustion of coal

Y. Zhang, X. Zhang, J. C. Tien, D. Wang

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

In underground coal mining, one of the biggest challenges is spontaneous combustion, which will not only present safety hazards but result in reserve losses as a result of burnt coal. The released heat coupled with other combustible gases commonly encountered underground will significantly increase the risk of explosion. In this paper, three-phase foam as an environment-friendly fire fighting agent composed of nitrogen, water and fry ash is introduced. The nitrogen facilitates inertization of the fire zone; the water helps cool down the fire and the fly ash can closely cover the coal to isolate the oxygen. What's more, the fry ash and the foaming agent are good free radical absorption. The comprehensive merits mentioned above make three-phase foam quite effective in quenching spontaneous combustion. Experiments indicate that three-phase foam can significantly slow down the temperature rise of coal during oxidation. The comparison between slurry and three-phase foam shows that the latter one is capable of flowing upward in the porous media so as to extinguish the high-point fire and concealed fire.

Original languageEnglish
Title of host publicationSME Annual Meeting and Exhibit and CMA 113th National Western Mining Conference 2011
Pages553-558
Number of pages6
Publication statusPublished - 2011
Externally publishedYes
EventSME Annual Meeting and Exhibit and CMA 113th National Western Mining Conference 2011 - Denver, CO, United States of America
Duration: 28 Feb 20112 Mar 2011

Conference

ConferenceSME Annual Meeting and Exhibit and CMA 113th National Western Mining Conference 2011
CountryUnited States of America
CityDenver, CO
Period28/02/112/03/11

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