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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。
Starting from the process of the corrosion products migration of the steam-water system, the sources of the corrosion products of the steam-water system of the supercritical units are discussed. That is, a large amount of corrosion products are produced by the accelerated flow corrosion of components such as low-pressure heaters and high-pressure heaters, and the working fluid migrates with the working fluid. Due to changes in the physical parameters of the working substance, the solubility of the corrosion products is reduced, and a large amount of corrosion products are deposited in the high-temperature pipe. The study found that the formation of scale oxide tube from the one hand, its own high-temperature oxidation, on the other hand from the deposition of corrosion products. The results show that the different forms of corrosion in the different parts of the steam and water system can improve the quality of the water supply to restrain the influence of corrosion product migration on the unit and ensure the safe and stable operation of the unit.