某电厂1000MW超超临界机组除氧器入口溶解氧异常原因分析及处理  

Cause Analysis and Treatment of Abnormal Dissolved Oxygen at Deaerator inlet of a 1000MW Ultra-supercritical Unit in a Power Plant

作　　者：姬定西 晏海能 陈永光 程爱勇 廖娟子 王俊武 JI Ding-xi;YAN Hai-neng;CHEN Yong-guang;CHENG Ai-yong;LIAO Juan-zi;WANG Jun-wu(Xi’an Thermal Power Research Institute,Xi’an 710054,China;Sujin Shuozhou Coal Gangue Power Generation Co.,Ltd.Shuozhou 036800,China;Guoneng(Fuzhou)Thermal Power Co.,Ltd.Fuqing 350309,China;Guoneng Zhejiang Zhoushan Power Generation Co.,Ltd.Zhoushan 316100,China;Jiangxi Datang International Xinyu Second Power Generation Co.,Ltd.Xinyu 338013,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]苏晋朔州煤矸石发电有限公司,山西朔州036800 [3]国能(福州)热电有限公司,福建福清350309 [4]国能浙江舟山发电有限责任公司,浙江舟山316100 [5]江西大唐国际新余第二发电有限责任公司,江西新余338013

出　　处：《全面腐蚀控制》2023年第9期21-24,共4页Total Corrosion Control

摘　　要：某电厂1000MW超超临界机组给水处理工况从氧化性全挥发处理(AVT(O))向加氧处理(OT)转化时,出现除氧器入口溶解氧异常现象。从在线监测仪表的准确性、水汽低温取样系统严密性和低压加热器严密性等方面查找原因。结果表明:低加汽侧呈负压且密封不严,导致空气吸入低加汽侧,含有较高溶氧的低加疏水经疏水泵回收至8号低加水侧出口,引起除氧器入口溶解氧升高。When the feed water treatment condition of a 1000MW ultra-supercritical unit in a power plant changes from oxidizing total volatilization treatment(AVT(O))to Oxygenated treatment(OT),the dissolved oxygen at the deaerator inlet is abnormal.Find out the reasons from the accuracy of online monitoring instruments,the tightness of water and steam low-temperature sampling system and the tightness of low-pressure heater.The results show that the low pressure heater steam side is negative pressure and the seal is not tight,resulting in air being sucked into the low pressure heater steam side,and the low pressure heater drain water containing high dissolved oxygen is recycled to the outlet of the water side of the No.8 low pressure heater through the drain pump,resulting in the increase of dissolved oxygen at the deaerator inlet.

关 键 词：凝结水 溶解氧 低加疏水 加氧处理 

分 类 号：TM628[电气工程—电力系统及自动化]