Analysis on the effect of air quantity of coal mining face to air leakage and spontaneous combustion in goaf
Wang Dong
Abstract：In order to obtain an air distribution volume of the coal mining face under U type ventilation mode affected to the air leakage intensity of the goaf,a study was conducted with the numerical simulation and the site actual measurement combined method.Based on No.1312 coal mining face in Zhangjie Mine as a prototype,a nonlinear seepage 3D mathematical and physical model of the U type ventilation goaf was established.A simulation calculation was conducted on the flow field of the goaf under different air velocity of the air intake gateway.The site actual measured resuhs were fitted to the numerical simulation results.With the application of the irregular area calculation software and the Origin numerical analysis software,the distribution function of the air velocity area density in the goaf was obtained,and the calculation formula of the corresponding area in the arbitrary air velocity area of the goaf was deduced.According to the air leakage intensity,the spontaneous combustion zones of the goaf were divided.The study results showed that the area and width of the spontaneous combustion zone in the goaf would be increased in the Langmuir function with the air velocity in the air intake gateway increased.According to the limit width of the spontaneous combustion zone in the goaf,a minimum forward speed of the coal mining face was obtained.The actual forward speed of the coal mining face was higher than the obtained minimum forward speed of the coal mining face could be one of the important conditions to judge no spontaneous combustion occurred in the goaf.
Keywords：air velocity in air intake gatewayair velocity area density in goafLangmuir functionspontaneous combustion zone of goaf
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 96-101 )