施国忠,刘春红
SHI Guozhong,LIU Chunhong

• 1:浙江浙能技术研究院有限公司

摘要(Abstract)：

传统的给水加氧工艺由于存在过热器氧化皮剥落风险,危及机组安全运行,而给水低氧处理工艺又无法彻底解决给水和汽液相变区流动加速腐蚀的问题。对超超临界发电机组高压加热器汽液相变区采用氧化处理技术,实现精确、定点、定量加氧处理,成功解决了高压加热器汽液相变区的流动加速腐蚀问题,又避免了过热器氧化皮剥落的风险,提高了机组的安全经济性。高加汽液相变区进行氧化处理后,致密的Fe2O3氧化膜转化速度快,高加疏水Fe浓度下降达85%,Fe浓度小于1μg/L。
The traditional oxygenated treatment of feedwater jeopardizes operation safety of units due to falling-off of oxide skin of superheater. However, low oxygenated treatment of feedwater can not drastically eliminate flow accelerated corrosion of feedwater and steam-liquid phase transition zone. After oxygenated treatment in steam-liquid phase transition zone of high-pressure heater of ultra-supercritical units, accurate, fixedpoint and quantitative oxygenated treatment is achieved and flow accelerated corrosion of phase transition zone for high-pressure heater is successfully eliminated; in the meantime, the risk of oxide skin falling-off of superheater is prevented and the security and economical efficiency of the units are improved. After oxygenated treatment of steam-liquid phase transition zone, conversion speed of the dense Fe2O3 oxide film is fast, Fe concentration of high-pressure heater drainage decreases by 85% and Fe concentration is less than 1 μg/L.

关键词(KeyWords)： 超超临界机组;高压加热器;汽液相变区;氧化处理;腐蚀
ultra-supercritical units;high-pressure heater;steam-liquid phase transition zone;oxygenated treatment;corrosion

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 施国忠,刘春红
SHI Guozhong,LIU Chunhong

DOI: 10.19585/j.zjdl.2015.11.004

参考文献(References)：

• [1]DL/T 805.4-2004火电厂汽水化学导则第4部份:锅炉给水处理[S].北京:中国电力出版社,2004.
• [2]何辉纯.重视水流加速腐蚀(FAC)的危害[C]//第六届全国电厂化学学术研讨会论文集,2000.
• [3]ALEXANDER Y,SUPERFIN,PRABHAT KUMAR SINHA.Alternative boiler feedwater treatment by using the oxygenated technique[C]//International Water Conference,1993.
• [4]徐洪.给水加氧处理引发蒸汽通道氧化皮剥落的机理[J].动力工程学报,2011,31(9):672-677,699.
• [5]徐洪.基于“环境破坏说”的氧化皮剥落理论[J].动力工程学报,2012,32(9):733-740.