摘要
对汕头热电一厂4号锅炉水冷壁管频繁爆管进行了检查分析,根据水冷壁管爆口外观特征、金相检验、垢样化验和机组水质检查结果,可确认垢下碱性腐蚀是造成爆管的主要原因。阐述了垢的形成及垢下碱性腐蚀的机理。在更换失效管段以后,通过改造除氧器及加强水质化学监控等措施,有效地解决了水冷壁爆管问题。
By way of visual checking and metallographic examination on the rupture surfaces of tubes of boiler No. 4 in Shantou No. 1 Thermal Power Plant and based on water quality analysis, under-deposit alkali corrosion has been found to be the main cause of tube burst failures frequently occurring to the boiler. The formation process of deposit and the mechanism of under-deposit alkali corrosion are illustrated. After replacement of the failed tube section, the problem has been effectively solved by altering relevant deaerators and enhancing water quality control.
出处
《发电设备》
2008年第1期49-52,共4页
Power Equipment
关键词
能源与动力工程
锅炉
水冷壁
爆管
垢下碱性腐蚀
给水
除氧
水质监控
energy and power engineering
boiler
water wall
tube burst
under-deposit alkali corrosion
feedwater deaeration
water quality control
