摘要
某1000MW超超临界机组在给水加氧出现了省煤器入口溶解氧异常降低的现象。通过排查机组运行日志、加氧系统、水汽品质和取样系统,结果表明:给水取样系统在高负荷下的加氧转化不完全,引起氧的消耗量增大,导致省煤器入口溶解氧降低。高温取样架运行排污过程中,高温、高压、高流速样水经过未完全钝化的Y型过滤器滤网,表面的钝化膜发生部分脱落,再度修复引起氧的消耗量增大,造成省煤器入口溶解氧降低。
The certain ultra supercritical 1000MW unit experienced an abnormal decrease in dissolved oxygen at the inlet of the economizer in the water steam system during oxygenation treatment.By checking the unit operation logs,oxygenation system,water and steam quality,and sampling system,the results showed that the oxygenation conversion of the feedwater system was incomplete under high load,resulting in an increase in oxygen consumption and a decrease in dissolved oxygen at the inlet of the economizer.The Y-shaped filter screen of the high-temperature sampling rack has not been completely passivated,and the high-temperature,high-pressure,and high-speed sample water generated during the sewage discharge process has a scouring effect on the filter screen,causing partial detachment of the oxide film.Repairing it again will cause an increase in oxygen consumption,leading to a decrease in dissolved oxygen in the feedwater.
作者
包呼群
王芳兰
张彬
张伟
姬定西
侯明辉
BAO Hu-qun;WANG Fang-lan;ZHANG Bin;ZHANG Wei;JI Ding-xi;HOU Ming-hui(Guoneng Sichuan Tianming Power Generation Co.,Ltd.Mianyang 621700,China;Xi’an Thermal Power Research Institute Co.,Ltd.Xi’an,710054,China)
出处
《全面腐蚀控制》
2024年第4期97-100,共4页
Total Corrosion Control
关键词
加氧处理
水汽系统
Y型过滤器
溶解氧
oxygenation treatment
water vapor system
Y-shaped filter
dissolved oxygen
