Development of Pressurized Reducing Combustor for over 1500ﾟC-class Gas turbine

1500℃以上燃气轮机增压减压燃烧室的开发

• 批准号: 05555202
• 负责人: ARAI Norio
• 金额: $ 5.89万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555202/
• 关键词: gas turbine; reducing combustion; c; c composite; high pressure; methane; nitrogen oxides; combustor; 高温; NO_X

In this study, the characteristics of the fuel-rich combustions of air-methane under pressurized conditions were experimentally investigated to develop a novel gas turbine, named Chemical Gas Turbine.The fuel-lean limit for the stable combustion does not depend on the methane flow rate and is constant while the fuel-rich limit extends over a wide region of the equivalence ratios.This result suggests that the stable combustor of air-methane system can be easily realized rather under fuel-rich conditions than in fuel-lean ones. Concentrations of product gases under various equivalence ratios were measured. The measured CO_2 concentrations were slightly higher than those calculated. The concentrations of CO,however, were lower than those theoretically calculated. Trace amount of O_2 was detected under a condition of phi>1.1 although the calculation predicted the absence of O_2. Methane was also detected even in a fuel-lean combustion regions. It is suggested by these results that much sufficient mixing of methane and air is necessary to attain preferable combustion conditions. Swirring or improvement of the injector may be promising for overcoming this problem. From the relationships theoretically and experimentally obtained between NOx emissions and the equivalence ratio, it was recognized that pressurization can control the NOx emissions particularly on fuel-rich side. Although it was well-known that prompt NOx mainly contributed to total NOx emissions in fuel-rich hydrocarbon combustion, the measured NOx emissions decreased with the increase in equivalence ratio as mentioned above.

为了开发一种新型的燃气轮机--化学燃气轮机，对加压条件下空气-甲烷系统的富燃料燃烧特性进行了实验研究。稳定燃烧的燃料贫化极限不依赖于甲烷流量，并且是恒定的，而富燃料极限在很大的当量比范围内是恒定的。这一结果表明，空气-甲烷系统的稳定燃烧器在富燃料条件下比在燃料贫化条件下更容易实现。测量了不同当量比下的产物气体浓度。测得的CO_2浓度略高于计算值。然而，CO的浓度却低于理论计算值。在PHi&gt；1.1的条件下检测到了微量的O_2，尽管计算预测了没有O_2。即使在贫油燃烧区域也检测到了甲烷。这些结果表明，甲烷和空气的充分混合对于获得较佳的燃烧条件是必要的。喷油器的旋转或改进有望克服这一问题。从理论和实验获得的NOx排放与当量比之间的关系可以看出，加压可以控制NOx的排放，特别是在燃料丰富的一侧。尽管众所周知，在富含燃料的碳氢化合物燃烧中，瞬时NOx主要贡献于总NOx排放，但如上所述，测量的NOx排放随着当量比的增加而减少。