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对采用烟气循环富氧燃烧方式设计的50 kW微型燃气轮机的低NOx燃烧室,运用数值软件进行了燃烧模拟计算,从入口氧浓度、水分、进口温度等几个方面对组分分布、及NOx生成规律进行了研究。结果表明:燃烧室出口NOx浓度随着入口温度增加、水分减少、入口氧浓度增加而增大。燃烧室内低NOx生成速率等势面充满整个火焰管,高NOx生成速率等势面分布于火焰下游的氧化性氛围增强的过渡区和掺混冷却区。微型燃气轮机燃烧室采用富氧循环烟气预混燃烧方式,不论入口参数如何变化,燃烧室出口NOx排放浓度都小于5×10-5mol/mol,可以实现低NOx清洁燃烧。
The combustion simulation of a low NOx combustion chamber of a 50 kW microturbine designed with flue gas recirculation and oxyfuel combustion was carried out by using numerical software. The composition distribution and NOx emission were analyzed from several aspects such as inlet oxygen concentration, moisture and inlet temperature, Generated rules were studied. The results show that the NOx concentration at the exit of combustion chamber increases with the increase of inlet temperature, the decrease of moisture and the increase of inlet oxygen concentration. In the combustion chamber, the potential of the low NOx formation rate is full of the entire flame tube, and the high NOx formation rate is distributed in the oxidation zone enhanced transition zone and the blending cooling zone downstream of the flame. The micro-gas turbine combustion chamber adopts oxygen-enriched circulating flue gas premixed combustion mode. No matter the inlet parameter changes, the NOx emission concentration at the exit of the combustion chamber is less than 5 × 10 -5 mol / mol, which can realize low-NOx clean combustion.