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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >EMISSION CHARACTERISTICS OF NO AND NO_2 IN RICH-LEAN COMBUSTION OF HYDROGEN
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EMISSION CHARACTERISTICS OF NO AND NO_2 IN RICH-LEAN COMBUSTION OF HYDROGEN

机译：富氢燃烧中NO和NO_2的排放特征

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摘要

Hydrogen is expected as a clean and renewable alternative to the conventional hydrocarbon fuels. Because the only possible pollutants from the hydrogen combustion are nitrogen oxides (NO_x), it is crucial to reduce the NO_x emission in the hydrogen utilization. The rich-lean combustion is well known as a technique to reduce the emission of the Zel'dovich NO from the continuous combustion burners for such as gas turbines and boilers. Because the Zel'dovich NO occupies a large part of the total NO_x emission, the rich-lean combustion is quite effective to reduce the NO_x emission. However, the NO_x reduction effect of the rich-lean combustion has not yet been proven for the hydrogen fuel, while the effect has been demonstrated for the hydrocarbon fuels. On the other hand, the prompt NO is emitted from the hydrocarbon combustion especially under the fuel-rich conditions. Though the amount of the prompt NO is quite small for premixed or diffusion combustion, it could be a relatively significant part in the total NO emission from the rich-lean combustion due to the decreased Zel'dovich NO. The authors estimate that hydrogen is more suitable for the rich-lean combustion compared with hydrocarbons, because hydrogen does not emit the prompt NO even under the fuel-rich conditions which necessarily exist in the rich-lean combustion. This research proposes the rich-lean combustion as a method to reduce the NO_x emission from hydrogen combustion and experimentally analyzes the characteristics using a coaxial rich-lean burner with varying the mixture conditions.
机译：氢有望成为传统碳氢燃料的一种清洁和可再生的替代品。由于氢燃烧中唯一可能的污染物是氮氧化物（NO_x），因此减少氢利用中的NO_x排放至关重要。稀混合气燃烧是众所周知的减少来自诸如燃气轮机和锅炉的连续燃烧燃烧器的Zel'dovich NO排放的技术。由于Zel'dovich NO占NO_x排放总量的很大一部分，因此稀薄燃烧对于减少NO_x排放非常有效。然而，对于氢燃料，还没有证明浓稀混合气燃烧的NO_x减少效果，而对于碳氢化合物燃料，已经证明了该效果。另一方面，特别是在燃料丰富的条件下，从碳氢化合物燃烧中排放出迅速的NO。尽管对于预混合或扩散燃烧而言，即时NO的量非常少，但由于Zel'dovich NO的减少，在稀燃燃烧的NO排放总量中可能占相当大的一部分。作者估计，与碳氢化合物相比，氢更适合于稀混合气燃烧，因为即使在稀混合气燃烧中必不可少的富燃料条件下，氢也不会立即释放出NO。这项研究提出了浓稀混合气燃烧作为减少氢燃烧产生的NO_x排放的方法，并通过使用同轴的稀稀混合气燃烧器在不同的混合条件下进行了实验分析。

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