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The Scientific World Journal
Volume 2014, Article ID 293142, 9 pages
http://dx.doi.org/10.1155/2014/293142
Research Article

Impact of Heat and Mass Transfer during the Transport of Nitrogen in Coal Porous Media on Coal Mine Fires

Bobo Shi1 and Fubao Zhou1,2,3

1School of Safety Engineering, China University of Mining and Technology (CUMT), Xuzhou 221116, China
2Key Laboratory of Gas and Fire Control for Coal Mines, CUMT, Xuzhou 221116, China
3National Engineering Research Center for Coal and Gas Control, CUMT, Xuzhou 221116, China

Received 11 April 2014; Accepted 3 June 2014; Published 25 June 2014

Academic Editor: Mingfa Yao

Copyright © 2014 Bobo Shi and Fubao Zhou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The application of liquid nitrogen injection is an important technique in the field of coal mine fire prevention. However, the mechanism of heat and mass transfer of cryogenic nitrogen in the goaf porous medium has not been well accessed. Hence, the implementation of fire prevention engineering of liquid nitrogen roughly relied on an empirical view. According to the research gap in this respect, an experimental study on the heat and mass transfer of liquid nitrogen in coal porous media was proposed. Overall, the main mechanism of liquid nitrogen fire prevention technology in the coal mine is the creation of an inert and cryogenic atmosphere. Cryogenic nitrogen gas vapor cloud, heavier than the air, would cause the phenomenon of “gravity settling” in porous media firstly. The cryogen could be applicable to diverse types of fires, both in the openings and in the enclosures. Implementation of liquid nitrogen open-injection technique in Yangchangwan colliery achieved the goals of fire prevention and air-cooling. Meanwhile, this study can also provide an essential reference for the research on heat and mass transfer in porous media in the field of thermal physics and engineering.