某电厂1000MW超超临界机组给水加氧异常原因分析  

Analysis of Abnormal Feedwater Oxygenation in a 1000MW Ultra Supercritical Unit of a Power Plant

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)

机构地区：[1]国能四川天明发电有限公司,四川绵阳621700 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《全面腐蚀控制》2024年第4期97-100,共4页Total Corrosion Control

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.

关 键 词：加氧处理 水汽系统 Y型过滤器 溶解氧 

分 类 号：TM621[电气工程—电力系统及自动化]