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基于煤炭自燃的自由基反应机理,采用电子自旋共振(ESR)测谱仪,直接测定煤体在破碎、低温氧化和紫外光照射过程中的自由基.结果表明,诸因素均能诱发煤自由基的形成:煤体被破碎地越细小,自由基浓度越大;氧化温度越高,煤自由基浓度越大,125℃之后,煤的自由基浓度明显上升;氧化时间越长,煤自由基浓度越大,但增加的速度比较慢;煤中自由基对紫外光也极其敏感,在刚开始光照和刚撤除光照的前10 m in内,自由基浓度变化最快.根据实验结果,对煤自燃过程中存在的一些现象作了解释.图4,表1,参11.
Based on the free radical reaction mechanism of spontaneous combustion of coal, the electron spin resonance (ESR) spectrometer was used to directly measure the free radicals of coal during crushing, low temperature oxidation and ultraviolet irradiation.The results showed that all factors could induce coal freedom The formation of the base: the smaller the coal is broken, the greater the concentration of free radicals; the higher the oxidation temperature, the greater the concentration of coal free radicals, after 125 ℃, the coal free radical concentration significantly increased; oxidation longer, coal free radicals The higher the concentration, the slower the increase rate. The free radicals in coal are also extremely sensitive to UV light, and the free radical concentration changes fastest during the first 10 mins of light and just after light removal. According to the experimental results, Some phenomena existing in the process of spontaneous combustion are explained in Figure 4, Table 1, Senate 11.