超(超)临界机组高压加热器疏水加氧处理的研究  

Research on Oxygenated Treatment for High Pressure Heater Drainage Water of Ultra Supercritical Units

作　　者：孟龙[1] 贾兰 张文帅[3] 杨水养 吕鹏 李俊菀[1] MENG Long;JIA Lan;ZHANG Wenshuai;YANG Shuiyang;LV Peng;LI Junwan(Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710032,China;Shenhua Guohua Ningdong Electricity Generating Co.,Ltd.,Lingwu 750408,China;Tianjin SDIC Jinneng Electricity Generating Co.,Ltd.,Tianjin 300480,China;Guangdong Shaoguan Yuejiang Electricity Generating Co.,Ltd.,Shaoguan 512132,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]神华国华宁东发电有限责任公司,宁夏灵武750408 [3]天津国投津能发电有限公司,天津300480 [4]广东省韶关粤江发电有限责任公司,广东韶关512132

出　　处：《中国电力》2020年第6期172-178,共7页Electric Power

摘　　要：为规避给水高浓度加氧处理(高氧处理)可能出现的促进过热器、再热器奥氏体钢氧化皮集中剥落的风险,一些电厂给水采用低浓度加氧处理(低氧处理),而给水低氧处理无法解决高压加热器疏水系统的腐蚀问题。为此研究了"给水低氧处理+高压加热器疏水单独加氧处理"的全保护加氧处理工艺,并将此工艺用于某660 MW超超临界机组。研究结果表明:全保护加氧处理工艺可以兼顾解决水汽系统的腐蚀问题及规避高氧处理潜在风险;高压加热器疏水加氧能够快速显著降低铁腐蚀产物含量,尤其是悬浮铁含量,加氧运行后高加疏水铁质量浓度<1μg/L;空气是高加疏水加氧最为安全的介质,对水汽品质(氢电导率、pH值等)的影响可忽略不计。In order to avoid the potential risk of extensive oxidation skin peeling in the superheater and reheater that arises from dosing high concentration oxygen(a.k.a high oxygenated treatment), some power plants adopt the low concentration oxygenated treatment(a.k.a. low oxygenated treatment). However, this type of low oxygenated treatment of the feed water cannot solve the corrosion problem of the high-pressure heater drainage system. Therefore full protective oxygenated treatment of "feed water treatment with low concentration oxygen plus high pressure heater drainage treatment with individual dosing oxygen" is developed and applied to a 660 MW ultra-supercritical unit. The results show that with the implementation of this full protective oxygenated treatment the corrosion problem of water steam system can be addressed without taking the potential risk of oxygenated treatment using high concentration oxygen. Oxygenated treatment can significantly reduce the content of iron corrosion products especially those of suspended iron. The iron concentration of high pressure heater drainage is less than 1 μg/L after oxygenated treatment. Also air is the safest medium for oxygenated treatment, which has negligible influence on water quality(such as hydrogen conductivity and pH value).

关 键 词：给水 高压加热器 疏水 加氧处理 水汽品质 水汽系统防腐 

分 类 号：TM621[电气工程—电力系统及自动化]