摘要
Large size utility boilers develop rapidly in China, both their reliability and economics have reached better level. The operating situations of various existing boilers on the basis of different coals are analyzed, it is held that, the notable energy imbalance of furnace exit, ever existing in the tangential firing boilers has been solved, with comparatively lower NOX emission concentration of gained. The higher NOX emission concentration and furnace slagging etc. problems existing in wall firing boilers are notable. The comprehensive analysis shows that, it is appropriate to choose lower furnace volume heat release rate and higher flame height in the type selection design of boilers, and sufficient margin should be kept in the selection of coal pulverizing mills.
我国大型电站锅炉迅速发展,其可靠性和经济性都达到了较好的水平。按不同煤种分析现有各类锅炉的运行状况可见,切圆燃烧锅炉炉膛出口烟气能量不平衡问题已基本解决,NO_x的排放浓度相对较低;墙式燃烧锅炉的NO_x较高,并有一些锅炉存在炉内结渣等问题;低挥发分煤锅炉运行的可靠性、经济性和NO_x排放问题较为突出;在锅炉的选型上也必须留有足够的余量。
