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注惰是矿井火灾救灾措施之一,但在救灾实践中向封闭火区注惰却诱发了爆炸,因此研究注惰对封闭火区可燃气体运移规律的影响十分必要。从理论上分析了封闭火区内发生的化学反应和气体组分,并依据质量守恒定律建立了封闭火区内气体浓度的数学模型和注入惰气后气体浓度变化的数学模型;设计、实施了封闭巷道内充注惰气模拟实验,实验结果证实矿井火灾可产生H2和烷烯烃类化合物等可燃性气体;通过对实验数据中O2、CO注惰前后浓度变化分析得出,充注惰气对封闭火区可燃气体具有改变风流流动状态的“活塞”推动作用;通过对比注惰前后CO理论计算值和实验测试值验证了理论分析和数学模型的可靠性。研究结果对于煤矿火灾救灾过程中防止次生灾害的发生具有重要意义。
Injecting inertia is one of mine fire relief measures, but injecting inert gas into the closed fire zone in the disaster relief practice induces an explosion. Therefore, it is necessary to study the influence of inerting on the law of combustible gas migration in a closed fire zone. The chemical reactions and gas components in closed fire zone are theoretically analyzed. Based on the law of mass conservation, a mathematical model of gas concentration in enclosed fire zone and a mathematical model of gas concentration change after inert gas injection are established. The closed tunnel filled with inert gas simulation experiments, the experimental results confirmed that the mine fire can produce H2 and alkane compounds and other flammable gases; through the experimental data in the O2, The combustible gas in the closed fire area has the function of “piston” promoting the flow state of the wind flow. The theoretical analysis and the reliability of the mathematical model are verified by comparing the theoretical calculated values of CO and experimental values before and after injection. The research results are of great significance for the prevention of secondary disasters during the disaster relief of coal mine fires.