Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation
Jing Shen1, Mingran Chang2, *
1 Beijing Academy of Safety Engineering and Technology, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China
2 School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, P. R. China
Abstract
One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.
Keywords: Coal Mine Gob, Coal Spontaneous Combustion, Nitrogen Injection, Numerical Simulation, “Oxidation Zone”, Temperature Programming Experiment.
Article Information
Article History:
Received Date: 15/10/2015
Revision Received Date: 04/08/2016
Acceptance Date: 06/08/2016
Electronic publication date: 21/09/2016
Collection year: 2016
© Shen and Chang; Licensee Bentham Open
open-access license:
This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0)
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work is properly cited.
*
Address correspondence to this author at the Ding on the 11th, Xueyuan Rd, Haidian District, Beijing, 100083, China; Tel: 18810538369; E-mail: changmingran0216@163.com
Open Peer Review Details |
Manuscript submitted on 15-10-2015 |
Original Manuscript |
Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation |