热力发电2017，Vol.46Issue(2)：120-124,5.DOI:10.3969/j.issn.1002-3364.2017.02.120
俄供机组低温再热器腐蚀分析
Analysis on corrosion of low temperature reheater in a Russian-made power plant
张广文 1胡杨 2刘锋 2王德军 3张翠伶 4王凤仙 2刘永兵2
作者信息
- 1. 神华国华(北京)电力研究院有限公司,北京100025
- 2. 西安热工研究院有限公司,陕西西安710032
- 3. 神华国华绥中发电有限责任公司,辽宁葫芦岛 125200
- 4. 神华国华盘山发电有限责任公司,天津301900
- 折叠
摘要
Abstract
The heating surface of Russian-made power plants suffers various corrosion during the downtime and standby period,especially at the bending area of low temperature reheater inlet.Thus,this paper inspects the corrosion condition of the inlet pipes of low temperature reheater in a Russian-made unit,and optical microscope,electron diffraction spectrometer and X-ray diffraction analyzer were used to analyze the corrosion location,composition and morphology of the corrosion products.The results indicate that,the dissolved oxygen corrosion occurred during the laying up of the plant is the major reason for inlet pipes corrosion of low temperature reheater.Because the pipe materials,location structure and design are inaccordance with the actual installation,some condensation water will deposit in the inlet pipes of low temperature reheater during the unsuitable shutdown process.The corrosive ion Cl and SO42-in the condensed water can promote the development of corrosion and the dissolved oxygen can induce the corrosion of pipes after the air leaked into the system.Therefore,during the shutdown process of the Russian-made unit,the production of condensed water in the low temperature reheater should be avoided,and necessary boiler stopshut down protective agent should be considered.关键词
俄供机组/低温再热器/停用腐蚀/溶解氧/凝结水/腐蚀电池/氧化皮Key words
Russian-made power plant/low temperature reheater/laying up corrosion/dissolved oxygen/condensate water/corrosion cell/oxide scale分类
能源科技引用本文复制引用
张广文,胡杨,刘锋,王德军,张翠伶,王凤仙,刘永兵..俄供机组低温再热器腐蚀分析[J].热力发电,2017,46(2):120-124,5.
