首页> 中文期刊>动力工程学报 >超临界锅炉SOFA对高温受热面吸热偏差影响的试验研究

超临界锅炉SOFA对高温受热面吸热偏差影响的试验研究

     

摘要

To solve the problems of steam side oxidation and overtemperature tube burst concerning superheater and reheater of a 600 MW supercritical boiler,experimental tests were carried out to study the influence of separated overfire air (SOFA) on heat absorption deviation of the high-temperature heating surfaces,under conditions of the SOFA nozzle being arranged respectively at tangent and reverse tangent angle of 15°,so as to analyze the effect of flue gas temperature distribution at furnace outlet and in horizontal flue duct on the steam temperature distribution in the superheater and reheater.Results show that it obviously helps to reduce the tangential circle diameter of upper furnace and minimize the heat absorption deviation in horizontal flue duct,when the SOFA nozzle is arranged at a reverse tangent angle.Uniform tube wall temperature distribution can be obtained in the high-temperature superheater by reasonable arrangement of air distribution,in which case the peak temperature at left side of final stage superheater is to be reduced by about 10 K.%针对某电厂600 MW超临界锅炉存在过热器和再热器管内生成氧化皮及超温爆管的现象,通过试验研究了该锅炉分离燃尽风(SOFA)喷嘴正切15°和反切15°情况下,不同的SOFA比例对高温受热面管屏间吸热偏差分布的影响,分析了炉膛出口和水平烟道烟气温度分布特性对过热器和再热器蒸汽温度分布的影响.结果表明:SOFA喷嘴反切对减小炉膛上部切圆直径、降低水平烟道内吸热偏差的作用明显;合理的配风能使高温过热器管壁温度分布更均衡,末级过热器左侧吸热峰值温度降低10K.

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