焦炉气撞击火焰碳烟生成特性与影响机制研究
Study on the characteristics and influence mechanism of soot formation of COG impinging flame
探究氧燃比(λ)与无量纲撞击距离(L/De)对火焰射流撞击壁面时的特性及碳烟分布的影响。通过实验与模拟相结合的方法,研究发现,随λ增大,火焰温度与热流密度升高,分布更趋均匀;OH*化学发光强度呈先增后减趋势,主导因素由化学反应转为撞击效应。当λ=0.5时,碳烟生成主导,浓度最高;λ>0.5时,氧化作用增强,碳烟减少。此外,减小撞击距离使火焰形态转变,亮度减弱而温度与热流密度上升,碳烟因混合增强而减少。研究结果对理解此类火焰行为及碳烟调控具有参考价值。
This study aims to investigate the effects of the equivalence ratio (λ) and dimensionless impingement distance (L/De) on flame characteristics and soot distribution during flame jet impingement on a wall.By combining experimental and simulation methods,the study reveals that as λ increases,flame temperature and heat flux density rise,with a more uniform distribution.The OH* chemiluminescence intensity initially increases and then decreases,as the dominant factor shifts from chemical reactions to impingement effects.At λ=0.5,soot formation dominates,resulting in the highest soot concentration.When λ>0.5,enhanced oxidation reduces soot.Additionally,reducing the impingement distance alters the flame structure,weakening luminosity while increasing temperature and heat flux density.Improved mixing under these conditions further reduces soot content.The findings provide valuable insights into flame behavior and soot control.
coke oven gas / impinging flame / soot / spectroscopic diagnosis / heat transfer
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鄂尔多斯高校科研创新“三清零四提升”项目(KYQN25Z010)
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