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首页> 外文期刊>Fuel >Effect analysis on energy conversion enhancement and NOx emission reduction of ammonia/hydrogen fuelled wavy micro-combustor for micro-thermophotovoltaic application
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Effect analysis on energy conversion enhancement and NOx emission reduction of ammonia/hydrogen fuelled wavy micro-combustor for micro-thermophotovoltaic application

机译：氨/氢气波状微燃烧器能量转换增强和NOx排放减排的影响分析

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摘要

Ammonia (NH3) is regarded as an alternative fuel not only as a carbon-free fuel but also as a renewable hydrogen-carrier. It is possible that the safety in micro-combustor can be improved through partial NH3 substitution for hydrogen. However, knowledge of the thermal performance and nitrogen oxides (NOx) emission of ammonia/hydrogen combustion, especially in the micro-combustor, has been insufficient. In order to enhance thermal performance, reduce NOx emission and improve flame stabilization of ammonia/hydrogen fuelled micro-combustors for thermophotovoltaic (TPV) application, three types of micro-combustors with a wavy profile are designed and evaluated. For this, a three-dimensional (3D) numerical model with a detailed chemical reaction mechanism has been verified and applied to assess the thermal performance of the modified micro combustors in terms of the outer wall temperature distributions. The average temperature of these wavy combustors is found to be much higher than that of the conventional smooth combustor, regardless of the hydrogen/ammonia mixture flow velocity. Moreover, the wavy is a more effective measure to improve temperature uniformity when the mixture velocity is greater than 12 m/s. Comparing the flame stability behaviours of hydrogen/ammonia/air blended combustion in both the conventional and the proposed wavy combustors reveals that the blowout limit is effectively broadened. Finally, the effects of 1) hydrogen/ammonia blended ratio and 2) fuel-air equivalence ratio on NOx emissions are examined in detail. It is found that approximately 21.2% of NOx emission reduction could be achieved in the ARC wavy micro-combustor. NOx emission reduction can be gradually improved, as the nitrogen fuel mass ratio is increased. This present research sheds lights on an effective design of a micro-combustor with enhanced thermal performance and reduced NOx emission.
机译：氨（NH3）不仅被视为替代燃料，不仅是碳燃料，而且是可再生氢载体。通过用于氢气的部分NH 3取代可以改善微燃烧器的安全性。然而，了解氨/氢燃烧的热性能和氮氧化物（NOx），特别是在微燃烧器中的发射不足。为了提高热性能，降低NOx排放和改善氨/氢气燃料微燃烧器的火焰稳定，用于蒸发器（TPV）应用，设计并评估了具有波浪型材的三种微型燃烧器。为此，已经验证了具有详细化学反应机理的三维（3D）数值模型，并应用于在外壁温度分布方面评估改性微燃烧器的热性能。无论氢/氨混合流速如何，都发现这些波浪燃烧器的平均温度远高于传统光滑燃烧器的温度。此外，当混合物速度大于12m / s时，波浪是一种更有效的措施，以提高温度均匀性。比较常规和所提出的波浪燃烧器中的氢/氨/空气混合燃烧的火焰稳定性行为揭示了井喷限量有效地扩大。最后，详细研究了1）氢/氨共混比和2）燃料空气等效比的影响。发现，在弧形波浪微燃烧器中可以实现约21.2％的NOx排放减少。随着氮燃料质量比增加，可​​以逐渐改善NOx排放减少。本研究揭示了一种有效设计的微燃烧器，具有增强的热性能和减少的NOx排放。

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  • 来源
    《Fuel》 |2021年第1期|119755.1-119755.10|共10页
  • 作者

    Han Lei; Li Junwei; Zhao Dan; Xi Yunzhi; Gu Xingpeng; Wang Ningfei;

  • 作者单位

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China|Univ Canterbury Dept Mech Engn Coll Engn Christchurch 8140 New Zealand;

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

    Univ Canterbury Dept Mech Engn Coll Engn Christchurch 8140 New Zealand;

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energy conversion performance; Blended fuel; Micro-combustion; Wavy profile; Blowout limit; NOx emissions;

    机译：能量转换性能;混合燃料;微燃烧;波浪概况;井喷限制;NOx排放;
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