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| Moving Process of Corrosion Products in Steam-water System of Supercritical Power Units |
Dongfang JIANG1,Yang BAI2,Zhongliang ZHU1,Naiqiang ZHANG1( ),Zhuonan XIAO1,Hong XU1 |
1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
2. Electric Power Research Institute of Ningxia Electric Power Corporation, Yinchuan 750001, China |
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Abstract The explosion of boiler tubes induced by the oxide scale causes a great influence on the safety and economy of power plants. The source of corrosion products in supercritical power plants is analyzed based on the physical and chemical properties of supercritical water, while the moving process of corrosion products can be described as follows: the corrosion products generated in the low pressure heaters and high pressure heaters, and then they are moving with the water. As the solubility of the corrosion products in the water was changed, which depended on both the pH and temperature, therewith the corrosion products deposit on the high temperature tubes. It follows from the analysis that the oxide scales on the boiler wall seem to be from two origins: the one is the high temperature corrosion of the tube wall itself, the other one is the deposition of corrosion products from upstream. Furthermore, the effect of the moving of corrosion products on the operation of power unit may be modified by properly inducing feed water of high quality in the steam-water system, thereby to ensure the safe and stable operation of the supercritical power unit.
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