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首页> 外文会议>ASME Turbo Expo >Combustion under Flue Gas Recirculation Conditions in a Gas Turbine Lean Premix Burner
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Combustion under Flue Gas Recirculation Conditions in a Gas Turbine Lean Premix Burner

机译：燃气涡轮机贫料燃烧器中烟气再循环条件下的燃烧

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An EV burner as installed in Alstom's dry low NO_x gas turbines was experimentally investigated under different Flue Gas Recirculation (FGR) and engine conditions. FGR enables the reduction of the high exhaust volume flow while significantly increasing the exhaust CO_2 concentration. This may substantially improve the post-combustion capture of CO_2. However, FGR introduces consequent changes in the gas turbine combustion process mainly because of the oxygen depletion and CO_2 increase within the oxidizer. N_2 and CO_2 were mixed with air in order to obtain at the burner inlet a synthetic oxidizer mixture reproducing O_2 and CO_2 levels spanning different FGR levels of interest for engine operation. In addition, various degrees of unmixedness of the reactive mixture were investigated by varying the ratio of fuel injected at different port locations in the investigated burner set. Stable operation was achieved in all tested conditions. The lean premix flame shifts downstream when O_2 is depleted due to the decrease of the reactivity, although it always stays well within the combustion chamber. The potential for NO_x reduction when using FGR is demonstrated. Changes of the NO_x formation mechanism are described and compared to the experimental data for validation. Unmixedness appears to be less detrimental to NO_x emission when under high FGR ratio. However, CO emission is shown to increase when FGR ratio is increased. Meanwhile, with the present gas turbine combustor, the CO emission follows the equilibrium limit even at high FGR ratio. Interestingly, it is observed that when the burner inlet pressure is increased (and consequently the inlet burner temperature), the increase of CO emission due to FGR is lowered while the NO_x emission stays at a very low level. This present an argument for using a higher cycle pressure in gas turbines optimized for FGR operation.
机译：在不同的烟道气再循环（FGR）和发动机条件下实验研究了Alstom干燥低NO_X燃气轮机中安装的EV燃烧器。 FGR使得能够减少高排气量流量，同时显着增加排气CO_2浓度。这可能大大改善了CO_2的燃烧后捕获。然而，FGR主要是由于氧化剂内的氧耗尽和CO_2增加而引入燃气涡轮机燃烧过程的改变。将N_2和CO_2与空气混合，以便在燃烧器入口处获得合成氧化剂混合物，再现O_2和CO_2水平，跨越不同的FGR对发动机操作的感兴趣的影响。另外，通过改变在研究的燃烧器组中的不同端口位置处注入的燃料的比例来研究反应混合物的各种程度的未混合。在所有测试条件下实现稳定的操作。尽管在燃烧室内始终保持良好时，当O_2耗尽时，当O_2被耗尽时，贫液预混火焰在下游移位。演示使用FGR时NO_X减少的可能性。描述了NO_X形成机制的变化，并与实验数据进行了描述了验证。在高FER率下，突发性似乎对NO_X发射不太有害。然而，当FGR率增加时，共同发射增加。同时，利用本发明的燃气涡轮机燃烧器，CO发射即使在高FGR率下也遵循平衡限制。有趣的是，观察到，当燃烧器入口压力增加时（并且因此入口燃烧器温度），由于FGR引起的CO发射的增加降低，而NO_X排放保持在非常低的水平。本发明的一个参数用于在优化用于FGR操作的燃气轮机中使用更高循环压力。

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