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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Design Improvement Survey for NO_x Emissions Reduction of a Heavy-Duty Gas Turbine Partially Premixed Fuel Nozzle Operating With Natural Gas: Numerical Assessment
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Design Improvement Survey for NO_x Emissions Reduction of a Heavy-Duty Gas Turbine Partially Premixed Fuel Nozzle Operating With Natural Gas: Numerical Assessment

机译：用天然气运行的重型燃气轮机部分预混合燃料喷嘴的NO_x排放降低设计改进调查：数值评估

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摘要

A numerical investigation of a low NO_x partially premixed fuel nozzle for heavy-duty gas turbine applications is presented in this paper. Availability of results from a recent test campaign on the same fuel nozzle architecture allowed the exhaustive comparison study presented in this work. At first, an assessment of the turbulent combustion model was carried out, with a critical investigation of the expected turbulent combustion regimes in the system and taking into account the partially premixed nature of the flame due to the presence of diffusion type pilot flames. In particular, the fluent partially premixed combustion model and a flamelet approach are used to simulate the flame. The laminar flamelet database is generated using the flamelet generated manifold (FGM) chemistry reduction technique. Species and temperature are parameterized by mixture fraction and progress variable. Comparisons with calculations with partially premixed model and the steady diffusion flamelet (SDF) database are made for the baseline configuration in order to discuss possible gains associated with the introduced dimension in the FGM database (reaction progress), which makes it possible to account for nonequilibrium effects. Numerical characterization of the baseline nozzle has been carried out in terms of NO_x. Computed values for both the baseline and some alternative premixer designs have been then compared with experimental measurements on the reactive test rig at different operating conditions and different split ratios between main and pilot fuel. Numerical results allowed pointing out the fundamental NO_x formation processes, both in terms of spatial distribution within the flame and in terms of different formation mechanisms. The obtained knowledge would allow further improvement of fuel nozzle design.
机译：本文介绍了用于重型燃气轮机应用的低NO_x部分预混合燃料喷嘴的数值研究。最近在相同的燃油喷嘴结构上进行的测试活动的结果的可用性，使这项工作中提出的详尽比较研究成为可能。首先，对湍流燃烧模型进行了评估，并对系统中预期的湍流燃烧状态进行了严格的研究，并考虑了由于存在扩散型引燃火焰而导致的火焰的部分预混特性。特别地，使用流利的部分预混燃烧模型和小火焰方法来模拟火焰。层流小火焰数据库是使用小火焰生成歧管（FGM）化学还原技术生成的。物种和温度通过混合比例和过程变量进行参数化。对基线配置与部分预混模型和稳态扩散小火焰（SDF）数据库的计算进行了比较，以便讨论与FGM数据库中引入的尺寸相关的可能收益（反应进度），从而可以解决不平衡问题。效果。基准喷嘴的数值表征已根据NO_x进行。然后将基线和一些替代性预混器设计的计算值与在不同操作条件下以及主燃料和引燃燃料之间的分流比不同的反应性试验台上的实验测量值进行了比较。数值结果可以指出基本的NO_x形成过程，包括火焰内部的空间分布以及不同的形成机理。获得的知识将允许进一​​步改进燃料喷嘴的设计。

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  • 来源
    《Journal of Engineering for Gas Turbines and Power》 |2016年第1期|011501.1-011501.9|共9页
  • 作者

    Alessandro Innocenti; Antonio Andreini; Bruno Facchini; Matteo Cerutti; Gianni Ceccherini; Giovanni Riccio;

  • 作者单位

    Department of Industrial Engineering, University of Florence, Via S. Marta 3, Florence 50139, Italy;

    Department of Industrial Engineering, University of Florence, Via S. Marta 3, Florence 50139, Italy;

    Department of Industrial Engineering, University of Florence, Via S. Marta 3, Florence 50139, Italy;

    GE Oil & Gas Nuovo Pignone s.r.l., Via F. Matteucci 2, Florence 50127, Italy;

    GE Oil & Gas Nuovo Pignone s.r.l., Via F. Matteucci 2, Florence 50127, Italy;

    GE Oil & Gas Nuovo Pignone s.r.l., Via F. Matteucci 2, Florence 50127, Italy;

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