采用Chemkin软件中的OPPDIF（对冲扩散火焰）模型对H2/CO合成气燃烧产生的NOx排放特性进行了数值研究,分析了合成气扩散火焰中H2体积分数对NOx形成的影响。使用OPT（光学薄辐射）模型考察了辐射散热对模拟火焰的影响，采用GRI-Mech 3.0详细化学反应机理研究了NOx的生成机制。数值模拟结果表明：非绝热条件下，随着合成气中H2体积分数的增加，层流对冲扩散火焰的峰值温度单调增加；在绝热条件下，合成气火焰的峰值温度会随H2体积分数的增加而略微下降；同时，随着H2 体积分数的增加，合成气燃烧产生的NO含量明显增加，其中热力型NO的生成量随H2体积分数的增加变化明显，主导着NO生成量的变化趋势。

This paper reports a numerical investigation of H2/CO syngas NOx emission in opposed-flow diffusion flame by using Chemkin. An analysis of how hydrogen fraction influence the NOx emission by changing mole fraction of hydrogen is provided. Optical thin model is applied to consider the influence of radiation heat to the flame, using GRI-Mech 3.0 as reaction mechanism. The computational predictions showed that the flame temperature increases monotonously with H2 fraction increasing. However, the flame temperature under adiabatic condition decreases with hydrogen fraction increasing. Meanwhile, with hydrogen fraction increasing, the NOx emission of syngas flame increases obviously, and the thermal route contributes the largest part of NO emission increasing, leading the variation of NOx emission.

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国家自然科学基金资助项目（51706107）；江苏省高校自然科学研究面上项目(16KJB470011)；江苏省产学研联合创新资金项目（BY2013001-02）