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采用现场试验研究和数值模拟的方法对布置前后墙对冲燃烧器的某600MW超临界锅炉CO和NOx的排放特性进行了研究.结果表明:锅炉尾部烟气中CO质量浓度为500～2 500mg/m3,当主燃烧区过量空气系数α1为0.86～0.90时,高于该锅炉低NOx排放的设计过量空气系数(0.80),对应的燃尽风占二次风的比例约为27%～32%,NOx排放质量浓度出现拐点;锅炉的NOx排放特性与HT-NR3燃烧器的低NOx设计有关,并与该锅炉的CO排放特性呈负相关关系;在负荷为600MW和总风量一定的工况下,当燃尽风比例从32%提高至49%时,CO排放质量浓度显著下降,飞灰可燃物浓度降低,氧气量对CO和NOx排放的影响明显减弱,但NOx排放质量浓度升高,主燃烧区侧墙高温腐蚀的风险增大.
The emission characteristics of CO and NOx in a 600MW supercritical boiler with front-to-back wall hedge burner are studied by means of field test and numerical simulation.The results show that the CO concentration in the tail gas of the boiler is 500-2 500mg / m3 , When the excess air ratio α1 in the main combustion zone is 0.86 ~ 0.90, the design excess air ratio (0.80) is higher than the low NOx emission of the boiler, the corresponding ratio of the burned air to the secondary air is about 27% ~ 32%, and the NOx NOx emission characteristics of the boiler are related to the low NOx design of the HT-NR3 combustor and have a negative correlation with the CO emission characteristics of the boiler; when the load is 600MW and the total air volume is constant, when When the proportion of burnt-out wind increased from 32% to 49%, the concentration of CO emission decreased significantly, the concentration of combustibles in fly ash decreased, the effect of oxygen on CO and NOx emissions decreased significantly, but the concentration of NOx emission increased. The risk of high temperature corrosion of the sidewalls increases.