多元可燃性混合气体爆炸中间产物发射光谱特性实验研究

从矿井火区实际出发，选用类似于煤矿开采现场产生的多元可燃性气体:CH4，C2H6 ，C2H4，CO，H2 ，利用瞬态光谱测量系统探究了爆炸引发阶段中间产物的光谱特征，分析了组分配比、组分浓度和甲烷浓度对压力特性和中间产物光谱的影响。研究结果表明:在多组分气体加入量较小（未形成体系贫氧状态）时，3种自由基发射光谱峰值出现时间随着甲烷浓度的增大先缩短后延长；在多组分气体加入量较大（形成体系贫氧状态）时，自由基发射光谱峰值出现时间随着甲烷浓度的增大不断延长；当其以任意比例混合后，微观反应过程中关键自由基的出现顺序为:OH自由基先于O自由基， O自由基先于H自由基出现。

Experimental study on emission spectral characteristics of intermediate products in multi-component combustible gas mixture explosion

Beginning with the actual situation of mine fire area, the multi-component combustible gases including CH4, C2H6, C2H4, CO and H2 were selected, which are similar to the coal mining field. The spectral characteristics of the intermediate products in the explosion initiation stage were investigated by using the transient spectroscopy measurement system, and the influence of composition ratio, components concentration and methane concentration on the pressure characteristics and the spectrum of intermediate products were analyzed. The results showed that when adding the multi-component gas with small amount (without forming a system lean oxygen state), the appearance time of peak value for the emission spectrums of three kinds of free radicals shortened first and then extended with the increase of methane concentration. However, when adding the multi-component gas with large amount (forming a system lean oxygen state), the appearance time of peak value for the emission spectrums of free radicals extended continuously with the increase of methane concentration. When mixing with any proportion, the key free radicals in the microscopic reaction process appeared with the order of OH free radical, O free radical and H free radical from earlier to later.