轴向分级燃烧器中CH4、H2和NH3/H2预混火焰的结构和稳定性

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering for Gas Turbines and Power-transactions of The Asme Pub Date : 2023-10-11 DOI:10.1115/1.4063718
Aksel Ånestad, Ramgopal Sampath, Jonas Moeck, Andrea Gruber, Nicholas Worth
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引用次数: 0

摘要

摘要采用两级燃烧室设计,对CH4、H2和NH3/H2混合燃料的火焰结构、稳定性和排放性能进行了实验研究。主火焰区以预混钝体稳定火焰为主,辅以预混反喷火焰为主。在不同加注工况下,总功率和空气流量保持不变,而改变级间空气分裂和当量比,以探索与燃气轮机运行相关的条件。特别着重分析了二级相对射流火焰的结构。与之前关于横流中反应射流的文献相反,由于它们的靠近,这些相互作用显著,导致燃烧室中心撞击层的合并火焰区(MFZ)。随着射流与横流动量比的增加,MFZ的形状发生了变化,在甲烷的情况下接近壁面,但在几乎纯氢的情况下仍然非常紧凑。对于氢火焰,将更多的空气转移到第二级可以达到更高的总热功率条件,同时避免闪回和不稳定。对于氨氢火焰,燃料被保存在初级区域,当空气被转移到二级区域时,会产生一些局部丰富的条件。当主火焰以1.15的当量比运行时,会出现局部NOx最小值。火焰结构分析将NOx的减少与NH3热解联系起来,然后是二次H2逆扩散火焰。
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The Structure And Stability of Premixed CH4, H2, and NH3/H2 Flames in an Axially Staged Can Combustor
Abstract An experimental investigation of flame structure, stability, and emissions performance was conducted in a two-stage combustor design operated with CH4, H2, and NH3/H2 fuel blends. The main flame zone features a premixed bluff body stabilized flame, with a secondary premixed opposing jet flame. The total power and air flow rate are kept constant between the different fuelling cases, while the air split between stages and equivalence ratios are varied to explore conditions relevant to gas turbine operation. Special emphasis is given to analysing the structure of the opposing jet flames in the secondary stage. In contrast to previous literature on reacting jets in cross flow, these interact significantly due to their proximity, leading to a merged flame zone(MFZ) at the impingement layer in the centre of the combustion chamber. As the jet-to-crossflow momentum ratio increases, the MFZ changes shape, reaching close to the walls for the methane cases, but remaining very compact when operating with almost pure hydrogen. For the hydrogen flames, diverting more air to the second stage allows higher total thermal power conditions to be reached, while avoiding flashback and instability. For ammonia-hydrogen flames, the fuel is kept in the primary zone, resulting in some locally rich conditions when air is diverted to the secondary. A local NOx minima occurs when the primary flame is operated at an equivalence ratio of 1.15. Analysis of the flame structure links decreasing NOx to NH3 pyrolysis, followed by a secondary H2 inverse diffusion flame.
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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