Abstract:

To study effects of C₂H₆/C₃H₈ on explosion limits and chemical kinetics, a standard test device was employed to investigate effects of C₂H₆/C₃H₈ on explosion limits of CH₄ and determine the critical parameters of CH₄ explosion. In addition, Chemkin software was used to simulate the influence of C₂H₆/C₃H₈ mixed gas on the concentration of intermediates during methane explosion, and sensitivity analysis was carried out. Results indicated that the presence of C₂H₆/C₃H₈ decreased the explosion limits of CH₄ while increased its explosion risk. In the inerting process, the reducing upper explosion limit and the rising lower explosion limit of CH₄ merged at the same point where the critical concentration of CH₄ and N₂ all gradually decreased with the addition of C₂H₆/C₃H₈. Moreover, the production of CO and·H gradually increased while that of CO₂,·O and·OH declined after adding C₂H₆/C₃H₈. It is suggested that the addition of C₂H₆/C₃H₈ promoted CH₄ explosion to some extend by sensitivity analysis. By contrast, it is found that the higher content of C₃H₈ indicated the greater influence on the related parameters in the process of methane explosion, which can provide a certain theoretical basis for the safety production of industrial and mining enterprises.

Key words: methane, explosion, C₂H₆/C₃H₈ mixture, limiting parameters, kinetics, sensitivity analysis

摘要：

为研究C₂H₆/C₃H₈对甲烷爆炸极限参数及动力学特性的影响，采用标准的可燃气体爆炸极限测定装置测定了不同配比的C₂H₆/C₃H₈混合气体对甲烷爆炸极限的影响规律，同时得出了氮气惰化条件下甲烷爆炸临界参数的变化规律。此外，利用Chemkin软件模拟了C₂H₆/C₃H₈混合气体对甲烷爆炸过程中中间产物浓度的影响情况，并进行了敏感性分析。结果表明，C₂H₆/C₃H₈的存在降低了甲烷的爆炸上下限，增大了甲烷的爆炸危险度；在氮气惰化过程中甲烷的爆炸上限下降，爆炸下限上升，最终爆炸上下限重合，重合点处甲烷浓度和氮气临界浓度均随C₂H₆/C₃H₈的添加而逐渐减小；此外，C₂H₆/C₃H₈混合气体使甲烷爆炸过程中CO和·H的生成量逐渐增大，而CO₂、·O和·OH的生成量则有下降趋势，通过对爆炸过程中甲烷体积的敏感性分析，发现C₂H₆/C₃H₈的存在在某种程度上促进了甲烷爆炸。对比不同配比的C₂H₆/C₃H₈混合气体，发现C₃H₈含量越高，其对甲烷爆炸过程中相关参数的影响越大，这可为工矿企业的安全生产提供一定的理论依据。

关键词: 甲烷, 爆炸, C₂H₆/C₃H₈混合气体, 极限参数, 动力学, 敏感性分析