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华能淮阴电厂200MW机组的670t/h锅炉在投运3年后高温级再热器发生严重的高温氧化腐蚀现象,从1996年(1993年投产)开始每次中、小修都要更换腐蚀特别严重的管段。论文分析了该锅炉设计所依据的热力方法的缺陷,使炉膛出口和对流烟道烟温的计算值严重偏低;分析了高温级再热器的吸热不均和流量不均的严重性,对其室温进行了计算,指出高温氧化腐蚀发展较快的原因在于管壁严重超温;并提出了为缓和管子超温所应采取的对策和根本解决这一问题的改造措施。
Huaneng Huaiyin Power Plant 200MW unit 670t / h boiler put into operation three years after the high-temperature reheater serious high temperature oxidation corrosion occurred from 1996 (put into operation in 1993) every time, minor repairs have to replace the corrosion is particularly serious Pipe section. The paper analyzes the defects of the thermodynamic method on which the boiler is designed and makes the calculated values of the flue gas temperature at the exit of the furnace and the convective flue seriously lower. The imbalance of heat absorption and nonuniformity of the high temperature reheater are analyzed, The calculation of room temperature shows that the rapid development of high temperature oxidation corrosion is due to severe overheating of the pipe wall. The measures to be taken to ease overheating of the pipe and the reform measures to solve this problem are put forward.