摘要
从汽水系统腐蚀产物迁徙过程入手,探讨了超临界机组汽水系统腐蚀产物的来源,即低压加热器和高压加热器等部件发生流动加速腐蚀产生大量腐蚀产物,进入工质随工质进行迁徙。由于工质物性参数的变化,腐蚀产物溶解度降低,大量腐蚀产物沉积在高温管道。研究发现,炉管氧化皮的生成一方面来源于自身高温氧化,另一方面来自腐蚀产物沉积。结果表明,汽水系统不同部件内腐蚀形式不同,可以通过提高给水品质来抑制腐蚀产物迁徙对机组的影响,保证机组安全稳定运行。
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 sol- ubility 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 prod- ucts 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.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2016年第4期343-348,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金项目(51471069)
北京市自然科学基金项目(2152029)
中央高校基本科研业务费专项资金项目(2015ZD005)资助
关键词
超临界机组
汽水系统
腐蚀产物
离子迁徙
supercritical unit, steam-water system, corrosion product, transport process
