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针对典型烟煤合成气湍流预混火焰,利用平面激光诱导荧光技术测量燃烧中间产物OH自由基分布,研究H2含量和湍流强度对实际合成气火焰结构的影响。实验结果表明,H2对合成气火焰中OH生成具有正向促进作用,H2含量高的合成气在实际燃烧中更容易稳定着火,且燃烧速度更快,有利于合成气充分燃烧。湍流强度的增加使合成气火焰锋面的皱褶程度增大,且使火焰中OH自由基增多,强化了合成气燃烧。合成气湍流火焰的脉动特性受H2含量的影响不大,主要与湍流强度有关。
Aiming at the premixed flame of a typical bituminous coal syngas turbulent flow, the distribution of OH radicals in the combustion intermediate product was measured by a planar laser induced fluorescence technique, and the effect of H2 content and turbulence intensity on the flame structure of the actual syngas was investigated. The experimental results show that H2 promotes the formation of OH in the syngas flame, and the syngas with high H2 content can stabilize the fire more easily in the actual combustion, and the combustion speed is faster, which is favorable for the syngas to be fully burned. The increase of turbulence intensity increases the wrinkle of the flame front of the syngas and increases the OH radicals in the flame, which enhances the syngas combustion. The pulsation characteristics of the turbulent flame of syngas are not affected by the content of H2, which is mainly related to the turbulence intensity.