Effect of oxygenated treatment on corrosion of the whole steam–water system in supercritical power plant
Effect of oxygenated treatment on corrosion of the whole steam–water system in supercritical power plant
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DOI：
10.1016/j.applthermaleng.2015.10.098
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发表时间：
2016-01
影响因子：
6.4
通讯作者：
Dongfang Jiang;Hong Xu;Bo Deng;Liang Mengyuan;Zhuonan Xiao;Naiqiang Zhang
中科院分区：
文献类型：
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作者：
Dongfang Jiang;Hong Xu;Bo Deng;Liang Mengyuan;Zhuonan Xiao;Naiqiang Zhang
给水化学对化石发电机组的整体腐蚀和可靠性至关重要。分析了给水系统中溶解氧对碳钢腐蚀的影响。进行了锅炉管钢在含不同溶解氧的超临界水中的腐蚀试验。明确了溶解氧对汽水系统不同部位腐蚀的不同影响机理。溶解氧可以控制低温给水系统的流动加速腐蚀，但溶解氧会从腐蚀速率、SCC裂纹扩展速率和铬的蒸发消耗速率三个方面加速高温锅炉管的失效。考虑到整个汽水系统的腐蚀性，提出了一种更为有效的给水化学处理方法。
The feedwater chemistry is critical to the overall corrosion and reliability of the fossil fired generating units. The effect of dissolved oxygen on corrosion of carbon steels in feedwater system is analyzed. The corrosion experiments of boiler tube steels in supercritical water containing different dissolved oxygen are carried out. The different effect mechanics of dissolved oxygen on corrosion in different parts of steam–water system are defined. Flow accelerated corrosion in low temperature feedwater system can be controlled by dissolved oxygen, but dissolved oxygen can accelerate failure of boiler tubes at high temperature from three aspects: corrosion rate, crack growth rate of SCC, and evaporating consumption rate of chromium. Considering the corrosion of the whole steam–water system, a more effective feedwater chemistry treatment method is proposed.