煤自燃预测气体及活化能变化研究

发布时间：2018-03-11 13:04

  本文选题：安全工程　切入点：煤自燃　出处：《安全与环境学报》2017年05期 　论文类型：期刊论文

【摘要】：为了研究煤在低温阶段的自燃活化能及气体产生规律,基于耗氧量与煤温间的计算模型,利用煤氧化动力学测试系统,分析了3种不同自燃性煤的低温氧化表征。结果表明:1)随着煤自燃倾向性增强,煤的耗氧量和耗氧速率逐渐增大,且其耗氧速率急剧增大的拐点温度逐渐升高;2)不同自燃性煤活化能变化规律存在显著差异,利用阶段耗氧量拐点计算出铜川和大同煤样温度分别为203℃、228℃时,活化能快速减小,开始进入自发氧化阶段;晋城煤样活化能经历先减小后增大的过程,其中过渡温度段91~135℃时,活化能最小;同时拟合出活化能(E)与指前因子(A)关系式满足动力补偿效应,验证了机理函数的合理性;3)依据复合气体CO_2/CO、CH_4/C_2H_6、C_2H_4/C_2H_6、C_3H_8/C_2H_6随温度的变化趋势,结合煤低温氧化特性,可预测煤样的氧化进程和煤体温度。
[Abstract]:In order to study the spontaneous combustion activation energy and gas production law of coal at low temperature, based on the calculation model between oxygen consumption and coal temperature, the coal oxidation kinetics test system was used. The low temperature oxidation characteristics of three kinds of coal with different spontaneous combustion properties were analyzed. The results showed that the oxygen consumption and oxygen consumption rate of coal increased with the increase of spontaneous combustion tendency of coal. Moreover, the inflection point temperature with sharply increasing oxygen consumption rate gradually increased. (2) there were significant differences in the change of activation energy of coal with different spontaneous combustion properties. When the temperature of Tongchuan and Datong coal samples were calculated by using the inflection point of phase oxygen consumption, the temperature of Tongchuan coal and Datong coal was calculated to be 203 鈩，

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