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为探究煤自燃规律,选取陕西彬长集团大佛寺煤矿40106工作面不同回采时期的2组煤样作为试验样品,开展贫氧条件下煤放热特性试验研究。采用计算机智能动态稳定配气装置,并利用差示扫描量热仪(DSC)测试煤样放热数据。试验数据分析表明:随着煤样温度的升高,煤样放热量受氧体积分数的影响程度逐渐增大;随着环境贫氧程度的增大,即氧体积分数从21%降至5%,煤自燃过程放热速率的分界点温度基本呈线性增高趋势,煤自燃加速氧化阶段被延迟;由分界点确定的缓慢放热阶段与加速放热阶段的活化能均随着氧体积分数的降低而呈线性缓慢升高,贫氧条件对煤样反应及热效应有饱和抑制作用。
In order to explore the law of spontaneous combustion of coal, two groups of coal samples from 40106 working face of Dafosi coal mine in Shaanxi Binchang Group were selected as test samples to test the exothermic behavior of coal under oxygen-leaking conditions. Using computer intelligent dynamic stable gas distribution device, and the use of differential scanning calorimetry (DSC) test coal sample radiating data. Experimental data analysis shows that as the temperature of coal sample increases, the amount of exothermic heat of coal sample increases gradually with the increase of oxygen volume fraction. With the increase of oxygen levitation, the oxygen volume fraction decreases from 21% to 5% , The temperature of the exothermic rate at the boundary point of coal spontaneous combustion basically linearly increased, and the spontaneous combustion phase of coal spontaneous combustion was delayed. The activation energy of slow exothermic phase and accelerated exothermic phase determined by the demarcation point decreased with the decrease of oxygen volume fraction But linearly increased slowly. The condition of oxygen-depletion has a saturated inhibition effect on coal-like reaction and thermal effect.