Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
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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