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我厂两台408型400吨/时锅炉的对流过热器和后屏过热器,前几年由于饱和蒸汽品质欠佳和管排存在热偏差间题,曾多次发生超温爆管事故。近年来,经过汽包内部汽水分离结构改进,提高了饱和蒸汽品质,尽管对流过热器和后屏过热器管排的热偏差问题仍未解决,但由于加强了对Π11和10CrMo910钢管的防爆监察,及时更换超温变质的过热器管,已有
I plant two 408 400 t / h boiler convection superheater and the rear screen superheater, a few years ago due to the poor quality of saturated steam and tube row exist in the hot bias problem, has repeatedly occurred over-temperature burst tube accident. In recent years, steam drum internal steam-water separation structure improved to improve the quality of saturated steam, although the convection superheater and rear screen superheater tube thermal deviation remains unresolved, but due to strengthen the Π11 and 10CrMo910 steel explosion-proof monitoring, Timely replacement of overheated superheater tubes have been