Abstract A comprehensive analysis of the autoignition tendency of binary mixtures of hydrogen and carbon monoxide diluted with carbon dioxide is carried out in this paper. Methane Number (MN) measurements of these mixtures were performed by using a method analogous to the standard method for Octane Number (ON) measurement. The experimental MNs ranged from 46.0 to 139.1 according to experimental data. These results are compared with the MNs calculated by programs released for natural gas MN estimations. A comparative analysis concluded that these programs are not suitable to calculate MN of syngas. A method to isolate the effect of carbon dioxide on the autoignition tendency of binary mixtures of hydrogen and carbon monoxide is proposed. Results reveal that increments of carbon dioxide concentration in the mixtures, exponentially increase the MN of the mixtures. At low carbon dioxide concentration, the MN of the ternary mixtures can be approximated by the MN of their equivalent binary mixtures of hydrogen and carbon monoxide. Based on this observation, the MNs of coal gases reported in the literature are estimated.

中文翻译：

---

用二氧化碳稀释的氢气/一氧化碳混合物的甲烷值测量，用于合成气火花点火内燃机应用

摘要 本文综合分析了用二氧化碳稀释的氢气和一氧化碳二元混合物的自燃倾向。这些混合物的甲烷值 (MN) 测量使用类似于辛烷值 (ON) 测量的标准方法的方法进行。根据实验数据，实验 MN 的范围从 46.0 到 139.1。这些结果与为天然气 MN 估计发布的程序计算的 MN 进行了比较。比较分析得出结论，这些程序不适合计算合成气的 MN。提出了一种分离二氧化碳对氢气和一氧化碳二元混合物自燃趋势影响的方法。结果表明，混合物中二氧化碳浓度的增加，以指数方式增加混合物的 MN。在低二氧化碳浓度下，三元混合物的 MN 可以通过其等效的氢气和一氧化碳二元混合物的 MN 来近似。根据这一观察，估计了文献中报道的煤气的 MNs。