为研究复杂漏风条件下煤矿井下密闭区内煤氧化温升特性,利用大煤堆自然发火实验台,开展了持续漏风(风量0.6 m3/h)、微漏风(风量0.6 m3/h→0)及间断漏风(风量0.4,1.2,0.4 m3/h)条件下煤氧化过程与温度变化特性的研究.实验结果得到了持续漏风条件下风流的散热及供氧能力对煤自燃温升的影响特性,表明密闭区的“呼吸”漏风现象是引发煤氧化温升突变的原因,尤其是密闭区内注氮灭火后,煤体氧化温度的变化对“呼吸”漏风非常敏感.从理论上分析了复杂漏风环境下高温点的形成条件和演化规律.通过实验,获得了密闭区煤氧化高温点形成的判断依据,为密闭区煤自燃防治技术提供了理论依据.%In order to study the coal oxidation and temperature characteristics of complex air leakage in the underground fire zone,a big spontaneous combustion experimental platform was used and conducted the tests of coal oxidation and temperature characteristics under the conditions of continued leakage(air supply volume is 0.6 m3/h),micro-leakage(air supply volume is 0.6 m3/h→0) and intermittent leakage(air supply volume is 0.4,1.2,0.4 m3/h).The experimental obtains the impact properties of coal spontaneous combustion and temperature rising of wind flow for cooling and providing oxygen capacity under the continued leakage conditions,it was showed that "Breathing" phenomenon caused the oxidation and temperature mutation of coal.Especially after injection nitrogen replacing oxygen,the temperature of oxidation coal was very sensitive to repeated leakage;and the formation and evolution law of high temperature points were theoretically analyzed under the complex leakage condition.Through experiments the judgment rules of coal oxidation heat point are gotten in closed area,and a theoretical basis is provided for the spontaneous combustion controlling techniques in enclosed area.
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