Hydrogen addition effects on high intensity distributed combustion
Hydrogen addition effects on high intensity distributed combustion
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DOI：
10.1016/j.apenergy.2012.11.004
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发表时间：
2013-04
期刊：
影响因子：
11.2
通讯作者：
A. Khalil;A. Gupta
中科院分区：
文献类型：
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作者：
A. Khalil;A. Gupta
分布式燃烧在燃气轮机的高强度条件下有显著的改善，提供均匀的热场(改进的模式因子)、超低污染、增强稳定性和更高的效率。新鲜空气/燃料气流与热反应物质之间的混合是导致分布式反应和自燃的关键。对燃料的氢浓缩进行了研究，重点考察了在旋流条件下的燃烧稳定性和排放。结果表明，在贫油条件下，氢对甲烷(质量分数为4-15%，体积分数为25-58.5%)的浓缩对燃烧特性的影响。在预混燃烧条件下，富氢显著降低了CO排放，对NO排放的影响很小。氢气的加入扩大了燃烧室的稀薄运行极限，燃烧稳定，没有火焰波动或回火。结果表明，近体积分布的高强度燃烧具有超低排放(<；3ppm NO和<；9PPM CO)和较低当量比下的高性能。数值与实验相结合的方法能更真实地预测富氢甲烷燃烧过程中的NO排放。
Distributed combustion provides significant improvements under high intensity conditions characteristic of gas turbine to provide uniform thermal field (improved pattern factor), ultra-low pollution, enhanced stability and higher efficiency. Mixing between fresh air/fuel stream with hot reactive species is critical to result in distributed reactions and spontaneous ignition. Hydrogen enrichment of fuel is examined with emphasis on combustion stability and emissions under swirling flow conditions. Results are presented on the role of hydrogen enrichment to methane (4–15% by mass, 25–58.5% by volume) on the combustion characteristics under fuel-lean conditions. CO emission was substantially reduced with hydrogen enrichment, with minimal effect on NO emission under premixed combustion. Hydrogen addition extended the lean operational limits of the combustor with stable combustion and no flame fluctuations or flashback. Results obtained on pollutants emission and flame marking via OH*chemiluminescence revealed near volume distributed high intensity combustion with ultra-low emission (<3PPM NO and <9PPM CO) and high performance at lower equivalence ratio. Hybrid numerical–experimental approach can provide more realistic prediction of NO emission from hydrogen enriched methane combustion.