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重油火焰的低NOx排放非常重要,另外,油气锅炉容积热负荷大,极易发生燃烧振动。文中在9?MW燃烧重油试验台上进行试验,研究了投运燃尽风、喷水和喷蒸汽对重油NOx排放的影响,同时利用光谱仪进行火焰闪烁和火焰稳定性的研究。结果显示,投运燃尽风(over fire air,OFA)可有效降低NOx的排放浓度,不过,在开启OFA条件下,喷水法和喷蒸汽法对尾部NOx浓度影响都很小,喷水使火焰振荡频率升高,开启OFA下喷蒸汽会使火焰振荡频率降低,火焰振荡频率越小,火焰稳定性越差。试验结果证实了火焰频谱特性测试系统的有效性。
Low NOx emissions of heavy oil flame is very important, in addition, oil and gas boiler volume heat load, prone to combustion vibration. The experiment was carried out on a 9? MW combustion heavy oil test rig to study the influence of put-to-burn air, water spray and steam on the NOx emission of heavy oil. At the same time, flame flashes and flame stability were studied by spectrometer. The results show that OFA can effectively reduce the NOx emission concentration. However, when OFA is turned on, both the water injection method and the steam injection method have little effect on the tail NOx concentration. When the flame oscillation frequency increases, turning on the steam at OFA will reduce the flame oscillation frequency. The smaller the flame oscillation frequency is, the worse the flame stability will be. The test results confirm the effectiveness of the flame spectral characteristics test system.