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《Journal of Safety and Environment》 2004-06
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Numeral simulation model and application of temperature rise process caused by natural burn of lossed coal in goaf

LI Zong-xiang~1, WU Zhi-jun~2, WANG Zhen-xiang~2( 1 College of Vocational, Liaoning Technical University, Fuxin 123000, Liaoning, China; 2 Wulong Mine, Fuxin 123000, Liaoning, China)  
The present paper aims to introduce the author's visual numerical simulation of temperature-rising process due to the spontaneous combustion in goaf. The simulation model has been established on the basis of the seepage equation of air leakage, the seepage flow-diffusion-consumption equation of oxygen concentration and heat transfer equation, as well as the non-steady numerical model of spontaneous combustion in goaf, all of which are combined and solved by the windward finite element based numerical simulation. As an example, air leakage seepage flow, oxygen concentration distribution, temperature distribution in goaf and their accelerated variation process with time are discussed first theoretically, and then quantitatively and emphatically as to the relation between the oxygen consumption of the losing coal during the spontaneous combustion and temperature rising. Thus, it can be concluded that usually high temperature zone appears at the inlet air side, where boundary air leakage has little influence. Therefore, it is necessary to point out that the traditional tri-zone division is ambiguous as to the cooled zone, the spontaneous combustion zone and the suffocating zone, while the mode presented in the paper will enable to solve the spontaneous combustion problem more ideally. The simulated result shows that the temperature rise during spontaneous combustion is an accelerated process and the conclusion would accord with the law obtained by the experimental analysis and actual observation.
【CateGory Index】: TD752.2
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