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为研究氮气防灭火三相泡沫在采空区的稳定暨固氮特性,设计试验,采用自制的煤岩颗粒模拟采空区多孔介质,首次应用气体分析法研究了含氮气泡沫在多孔介质中的稳定性,解决了由三相泡沫在多孔介质中赋存状态的不可视性而带来的不能直接观察其稳定时间的难题,考察了三相泡沫在多孔介质中的稳定时间,分析了其影响因素。结果表明:三相泡沫在采空区多孔介质中具有较长稳定时间,可达11h以上;稳定时间除与三相泡沫基液浓度有关外,还受多孔介质空隙率的影响,空隙率大稳定时间短,反之稳定时间较长。最后分析了三相泡沫在采空区稳定性对其防治煤炭自燃特性的影响。
In order to study the stability and nitrogen fixation characteristics of nitrogen fire-extinguishing three-phase foam in mined-out area, the self-made coal-rock particles were used to simulate the porous media in the mined-out area. The gas analytical method was used for the first time to study the stability of nitrogen-containing foam in porous media The problem of inability to directly observe the stabilization time caused by the invisibility of the phase state of three-phase foam in porous media is solved. The stabilization time of the three-phase foam in porous media is investigated, and the influencing factors . The results show that the three-phase foam has a longer settling time in porous media in goaf, up to 11h. The stability time is also affected by the porosity of porous media and the stability of porosity is stable Short time, on the contrary, the stability time is longer. Finally, the effect of three-phase foam stability in goaf on its prevention and control of spontaneous combustion of coal was analyzed.