摘要
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。
Serious oxidization corrosion phenomenon occurred in high temp. reheater of 670t/h boiler in 200MW unit of Huaneng Huaiyin Power Plant in three years after put into operation. Seriously corrosive tube sections need to be replaced at each routine maintenance after year 1996 (operation in 1993). Defects in thermal calculation method on which boiler design is based were analyzed. Such defects caused the calculated value of gas temp. at furnace outlet and convection Pass being lower. Seriousness of nonuniform heat absorption and flow in high temp. reheater was analyzed, and wall temp.was calculated. It was pointed that reason for rapid development of high temp. oxidization corrosion was overheat of tube wall. This paper also presented countermeasures for relieving overheat of tubes and the retrofit measures for solving the problem completely.
出处
《锅炉技术》
北大核心
1999年第12期15-21,33,共8页
Boiler Technology
关键词
锅炉
再热器
高温腐蚀
热力计算
防治对策
Boiler reheater
High temp, Corrosion
Thermal calcualation
Wall temp, calculation
