氧化煤是经历过升温又降温过程的煤，在矿井火区启封、分层开采、遗煤复采等一直广泛存在，这些区域煤炭开发利用产生的煤尘为氧化煤尘。由于煤发生了不同程度的氧化，内部结构受到影响，所产生氧化煤尘的爆炸特性发生改变。
       本文以不同终止温度作为样品煤的预氧化程度，采用程序升温法对大佛寺不粘煤样制备了温度为 、 、 和 的氧化煤样，并以原煤样为辅助对照组，对氧化煤尘爆炸在不同变量(点火延迟、氧化煤尘浓度、氧化煤尘粒径)条件下的变化规律进行研究分析，以及氧化煤尘与甲烷共混体系在不同氧化煤尘、甲烷含量下的爆炸特性变化特征，探究了煤预氧化程度对煤尘及其与甲烷共混爆炸特性的影响规律，为相关矿井预防爆炸事故提供理论依据。所得结论如下：
       氧化煤尘爆炸过程可分为初始负压、高压喷尘、爆炸升压和压力衰减四个阶段。氧化煤尘爆炸特性随点火延迟时间增加，先增强后减弱，且在60ms时，爆炸特性达到极值。氧化煤尘浓度对纯氧化煤尘爆炸特性影响，随浓度增加，而呈二次函数规律，而爆炸特性的影响随氧化煤尘颗粒增大而单调减弱。
       煤的预氧化作用并未改变氧化煤尘爆炸最危浓度。氧化煤尘爆炸特性与氧化温度T之间，随氧化温度T升高，先增强后减弱，且遵循T115＞T75＞T155＞T25＞T195的变化规律，当煤经低温氧化后，煤尘具有更强爆炸威力，而较高温度氧化下的煤，其爆炸特性较弱。
       氧化煤尘甲烷共混爆炸过程包含压力骤升、压力极值和压力衰减阶段。氧化煤尘甲烷共混爆炸特性在氧化煤尘浓度单一影响下，因浓度增加而发生先增大后减小变化。在氧化煤尘体系中，甲烷的混入，会造成氧化煤尘爆炸特性增强，当甲烷含量大于7%时，其共混爆炸特性随甲烷增加，呈单调递减变化规律。
       共混爆炸体系中，煤的预氧化作用并未改变氧化煤尘最危浓度，与纯氧化煤尘爆炸特性规律一致。氧化温度T在升高的同时，氧化煤尘-甲烷共混爆炸特性并未与温度变化同步，而是遵循氧化温度T115＞T75＞T155＞T25＞T195的顺序，先增大后减弱。经低温氧化后的煤尘在甲烷环境下较原煤尘与甲烷混合产生更强的爆炸威力。但随着氧化程度加深，与纯氧化煤尘变化规律相似，共混爆炸威力朝弱化方向变化。
 

         Oxidation of coal undergoes a heating and cooling process, which has been prevailingly used in the unsealing of fire district, layered exploitation and re-mining of leftover coal in mines. The dust manufactured from these regions during production, has been called Oxidation of coal dust. Due to the different degrees of oxidation of coal has taken place, the internal structure is affected, resulting in the exploitation of the properties of oxidized coal dust explosion produces differently.
         In this paper, different termination temperatures are used as the pre-oxidation degree of the sample coal, and the temperature-programmed method was used to prepare oxidized coal samples with termination temperatures of 75℃, 115℃, 155℃ and 195℃ on non-stick coal samples from Dafo Temple, with raw coal as auxiliary Control group. Oxidation of coal dust blow-up in the different variables (ignition delay oxide dust strenth, dust oxide particle diameter) under the conditions of changes of research and analysis, and the explosive characteristics of the oxidized coal dust and methane blend system under different oxidized coal dust and methane content. The influence of the degree of pre-oxidation on the explosive property of coal dust and its blending with   is discussed, which can make a guidance for related mines on the precaution of explosion distress as a theoretical justification. Conclusions are as follows.
            The blow-up process of oxidized smut dust can be compartmentalized into four sections: initial vacuum, high-pressure dust spray, pressure boosting and attenuation phase. Explosive properties with the ignition postponement time increases, decreased after the first enhancement, and at the time of 60ms, it is in the mount. Consistence of pure oxide dust coal dust blowout property of the oxide, with increasing consistency, whereas a quadratic function rule, explosive characteristics of the impact of dust and oxide with increasing monotonically decreased.
            Pre-oxidation did not change the optimal denseness of oxidized coal dust blow-up. Explosion quadratic function trait trend between the oxidation temperature T, with T increases, the first reinforcing weakened, and follows T115＞T75＞T155＞T25＞T195, when the low temperature oxidation of coal, dust owns stronger explosive power, while the explosive consistency of coal under higher temperature oxidation are weaker.
          Blending process involves the explosion pressure swells, extremes and decay phase. Blending trait at a single Oxidation dust consistency is increased to reduce the variation due to the increasing consistency occurs. Because of methane, blended explosive feature is enhancing. When the content is more than 7% of methane, which is blended with the explosive characteristics of methane increases monotonically decreasing variation.
           The pre-oxidation of coal does not change the optimal concentration of oxidized coal dust in the mixed setup, which is consistent with the explosion features of pure oxidized dust. Oxidation of coal and methane blend explosive characteristics gap than a single significant oxidation of the coal dust blow-up, the methane denseness of 7%, the maximum gap, and with the methane content increases, this gap is shrike. Oxidation temperature while the elevated oxide dust-methane blend explosive properties are not synchronized with the change in temperature, but follow the sequence of the temperature T115＞T75＞T155＞T25＞T195, and enhances first and then downed. After being oxidized at low temperature, the coal dust produces stronger explosive power in the methane situation than raw coal dust mixed with methane in a methane environment. Whereas, with the deepening degree of oxidation, the explosive power of the admixture from the relative high temperature oxidation changes in the opposite direction, which is consistent with the change law of pure oxidized coal dust.
 

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