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为了将超细水雾技术应用于抑制井下采空区遗煤自燃,通过搭建超细水雾抑制受限空间煤燃烧的小尺寸试验台,研究了超细水雾抑制受限空间煤燃烧的有效性及影响因素。研究表明,施加超细水雾后,煤的热释放速率下降速度和受限空间O_2体积分数的下降速度增大,CO_2的生成量逐渐减少,而CO的生成量在短时间内急剧增大后又减少,最终趋于稳定。这说明超细水雾可以有效降低煤的热释放速率和组分生成速率。超细水雾抑制煤燃烧的效果依赖于其雾通量、开始施加时刻和施加时间等因素。雾通量充足时,在煤燃烧初期施加超细水雾,熄灭煤火焰的效果较好,待煤充分燃烧时,再施加超细水雾,熄灭煤火焰的时间延长;雾通量不足时,超细水雾无法抑制煤的燃烧。对充分燃烧的煤施加超细水雾的时间越长,熄灭煤火焰的效果越好。
In order to apply the superfine water mist technology to suppress spontaneous combustion of coal left in the underground goaf, the ultrafine water fog suppression limited space coal combustion is effectively controlled by setting up a small size test bench for superfine water mist suppression in limited space coal combustion Sexual and influential factors. The results show that after the superfine water mist is applied, the rate of decline of the heat release rate of coal and the rate of decline of O_2 volume fraction in the confined space increase, while the formation of CO 2 gradually decreases, while the CO formation increases sharply in a short period of time Reduce and eventually stabilize. This shows that ultra-fine water mist can effectively reduce the heat release rate of coal and the formation rate of components. The effect of ultrafine water mist on coal combustion depends on factors such as the fog flux, the start of application and the time of application. Fog flux is sufficient, the early stage of coal combustion to apply ultra-fine water mist, the effect of extinguishing coal flame is better, when the coal is fully burned, and then apply ultra-fine water mist, extinguish the flame of the coal longer; fog flux is insufficient, Superfine water mist can not inhibit the combustion of coal. The longer it takes to apply a fine mist to a fully burned coal, the better the effect of extinguishing the coal flame.