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Criteria Development for Gas Turbine Premixer Flameholding Tendencies of Natural Gas and High Hydrogen Content Fuels.

机译：天然气和高氢含量燃料的燃气轮机预混器火焰保持趋势的标准制定。

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摘要

Due to increasingly stringent air quality requirements, stationary power gas turbines have moved to lean-premixed operation, which reduces pollutant emissions but can result in flashback. Flashback can cause serious damage to the premixer hardware. Curtailing flashback can be difficult with hydrocarbon fuels and becomes even more challenging when the fuel contains hydrogen. The two main approaches for coping with flashback are either to design a combustor that is resistant to flashback, or to design a premixer that will not anchor a flame if flashback occurs. Even with a well-designed combustor, flashback can occur under certain circumstances. Thus it is necessary to determine how to avoid flameholding within the premixer passageways of a gas turbine. To this end, an experiment was designed that would determine the flameholding propensities at elevated pressures and temperatures of three different classes of geometric features commonly found in gas turbine premixers, with both natural gas and hydrogen containing fuel.;Experiments to find the equivalence ratio at blow off were conducted within an optically accessible test apparatus with four flameholders: 0.25 and 0.50 inch diameter cylinders, a reverse facing step with a height of 0.25 inches, and a symmetric airfoil with a thickness of 0.25 inches and a chord length of one inch. Tests were carried out at temperatures between 300 K and 750 K, at pressures up to 9 atmospheres. Typical bulk velocities were between 40 and 100 m/s. The effect of the airfoil's angle of rotation was also investigated. Blow off for hydrogen reactions was found to occur at much lower adiabatic flame temperatures than natural gas reactions. Additionally it was observed that at high pressures and high turbulence intensities, reactant velocity does not have a noticeable effect on the point of blow off due in large part to corresponding increases in turbulent flame speed. Finally a semi empirical correlation was developed that predicts flame extinction for both natural gas and hydrogen containing reactions.
机译：由于对空气质量的要求越来越严格，固定式燃气轮机已转向稀薄预混合运行，这减少了污染物排放，但可能导致回火。闪回会严重损坏预混器硬件。对于碳氢化合物燃料而言，减少反燃可能很困难，而当燃料中含有氢时，则更具挑战性。应对闪回的两种主要方法是设计一种耐闪回的燃烧器，或者设计一种在发生闪回时不会锚定火焰的预混器。即使使用设计合理的燃烧室，在某些情况下也会发生回火。因此，有必要确定如何避免在燃气轮机的预混合器通道内出现火焰。为此，设计了一个实验，该实验将确定燃气轮机预混器中常见的三种不同类别的几何特征（在天然气和氢气中都含有燃料）在升高的压力和温度下的耐燃性;在具有四个火焰保持器的光学可访问的测试设备中进行吹气：直径为0.25和0.50英寸的圆柱体，高度为0.25英寸的反向台阶，厚度为0.25英寸，弦长为1英寸的对称翼型。测试是在300 K和750 K之间的温度下，在高达9个大气压的压力下进行的。典型的整体速度在40至100 m / s之间。还研究了翼型旋转角度的影响。发现氢反应的吹散发生在绝热火焰温度比天然气反应低得多的情况下。另外观察到，在高压和高湍流强度下，反应物速度在吹扫点上没有显着影响，这在很大程度上是由于湍流火焰速度的相应增加。最后，建立了一个半经验相关性，可以预测天然气和含氢反应的火焰熄灭。

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  • 作者

    Sullivan-Lewis, Elliot Gregory.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Engineering Mechanical.;Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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