The Open Fuels & Energy Science Journal

2016, 9 : 47-54
Published online 2016 September 21. DOI: 10.2174/1876973X01609010047
Publisher ID: TOEFJ-9-47

RESEARCH ARTICLE
 Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

Jing Shen1 and Mingran Chang2, *

* Address correspondence to this author at the Ding on the 11, Xueyuan Rd, Haidian District, Beijing, 100083, China; Tel: 18810538369; E-mail: changmingran0216@163.com

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.