燃气轮机燃烧室空气加湿燃烧的实验研究

EXPERIMENTAL INVESTIGATION OF AIR HUMIDEFIED COMBUSTION IN GAS TURBINE COMBUSTOR

空气加湿燃烧是HAT循环的关键技术。本文通过中压全尺寸燃气轮机燃烧室空气加湿燃烧实验,研究了加湿度对燃烧特性的影响。实验中发现,燃烧室内温度分布、出口温度场、污染物生成(即NOx、CO、UHC)及燃烧稳定性都受到加湿度的影响。研究结果表明,空气加湿燃烧导致NOx排放显著下降, CO和UHC排放略有上升,燃烧室中压力振荡的频谱产生了变化,燃烧室出口温度场畸变加剧。作者从水蒸气影响燃烧的机理出发对实验结果进行了分析和解释。

The air humidified combustion is key technology of the humid air turbine (HAT) cycle. In this paper, an air humidified combustion experiment was carried out using mid-pressure full-dimension gas turbine combustor to determine the effects of humidity on combustion characteristics. It was detected that the temperature distribution within combustor, the temperature field at combustor exit, the pollutant emission (i.e. NOx, CO and UHC) and the stability of combustion were affected by humidity. The air humidified combustion may cause that NOx emission dramatically reduce, CO and UHC emission slightly increase, the spectrum of pressure oscillation within combustor changes, and the temperature field at combustor exit becomes more poor. These experimental results were analyzed and explained with the air humidified combustion mechanisms.