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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >IMPROVING EMISSION AND BLOW-OUT CHARACTERISTICS OF NOVEL NATURAL GAS LOW NOX BURNERS FOR HEAVY DUTY GAS TURBINE
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IMPROVING EMISSION AND BLOW-OUT CHARACTERISTICS OF NOVEL NATURAL GAS LOW NOX BURNERS FOR HEAVY DUTY GAS TURBINE

机译：改善重载燃气轮机新型天然气低NOx燃烧器的排放和吹出特性

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摘要

The development and the optimization of a novel dry low NOx burner may require several steps of improvement. The first step of the overall development process has been documented by authors in a previous paper and included an exhaustive experimental characterization of a set of novel geometries. The in-depth results analysis allowed to correlate the investigated design parameters to burner performances, discovering possible two-fold optimization paths. Recurrent verifications of the assumptions made to define prototypes design are considered a mandatory step to avoid significant deviation from the correct optimization path, which strongly depends on both objective function definition and selection of design variables. Concerning the objective function, a proper mathematical formulation was proposed in the previous work, which represented a balance between two apparently conflicting aspect like flame stability and low emissions. Concerning design variables, outcomes of the first test campaign have been used in the present work to define new burner geometries. Starting from a new baseline who has showed the widest low NOx operating window, additional geometrical features have been considered in this survey as potentially affecting flame stabilization. Thanks to the degree of freedom offered by DMLM technology, rapid prototyping of alternative geometries allowed to easily setup a new experimental plan for the second optimization step. Exploiting the same approach used in the first test campaign, new geometries have been tested in a single-cup test rig at gas turbine relevant operating conditions, showing Stable low-NOx operating windows have been evaluated throughout dedicated objective functions for all geometries and results showed lower NOx and CO emissions as a consequence of the newly introduced geometrical modifications. Moreover, the comparison with the estimates of the previous campaign proved the existence of the identified optimization path. Indeed, it furnished valid elements for further using of the proposed methodology for the improvement of emission and blow-out characteristics of novel burners and, more in general, for the development of a novel dry low NOx technology.
机译：新型干燥低NOx燃烧器的开发和优化可能需要几个改进步骤。整体开发过程的第一步已经被先前论文中的作者记载，包括一组新颖几何形状的详尽实验表征。深入的结果分析允许将调查的设计参数与燃烧器性能相关联，发现可能的双倍优化路径。用于定义原型设计的假设的经常性验证被认为是强制性的步骤，以避免与正确的优化路径的显着偏差，这强烈取决于目标函数定义和设计变量的选择。关于目标函数，在以前的工作中提出了适当的数学制定，这在两个明显相互冲突的方面之间表示平衡，如火焰稳定和低排放。关于设计变量，在本工作中使用了第一次测试活动的结果来定义新的燃烧器几何形状。从新的基线开始，谁展示了最宽的低Nox操作窗口，在该调查中考虑了额外的几何特征，可能影响火焰稳定。由于DMLM技术提供的自由度，允许替代几何形状的快速原型设计，可以轻松设置第二种优化步骤​​的新实验计划。利用在第一个测试活动中使用的相同方法，在燃气轮机相关操作条件下在单杯试验台上测试了新的几何，显示出稳定的低NOx操作窗口，这些窗口已经在整个几何形状和结果的专用目标功能中进行了评估由于新引进的几何修改，降低了NOx和CO排放。此外，与先前运动的估计的比较证明了所识别的优化路径的存在。实际上，它提供了有效的元素，以进一步使用所提出的方法，以改善新型燃烧器的排放和吹出特性，更一般地用于开发一种新型干燥低NOx技术。

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