高温状态下锅炉给水氧化还原电位监测与模拟实验研究

doi:10.11902/1005.4537.2017.155

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 487-494 DOI: 10.11902/1005.4537.2017.155

研究报告

本期目录 | 过刊浏览

高温状态下锅炉给水氧化还原电位监测与模拟实验研究

乔越, 朱志平(

), 杨磊, 刘志峰

长沙理工大学化学与生物工程学院电力与交通材料保护湖南省重点实验室长沙 410004

Monitoring and Simulated Experiments of Oxidation-Reduction Potential of Boiler Feedwater at High Temperatures

Yue QIAO, Zhiping ZHU(

), Lei YANG, Zhifeng LIU

Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China

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摘要:

通过实验室动态模拟给水实验,研究了氧化还原电位 (ORP) 与溶氧量、pH值、温度、流速的关系,并提出ORP经验计算式。结果表明,水溶液体系ORP随溶氧量的增大而增大,随pH值及温度的升高而减小,且受流速影响较小。相对于常温ORP测量,高温ORP信号有灵敏度高、精确性好的特点,能够实现对痕量溶氧的有效测量。在电厂实际运行中,可根据高温在线ORP监测结果,结合金属电位-pH值图判断金属腐蚀倾向,进而优化给水ORP。

关键词 ：氧化还原电位, 溶氧量, pH值, 20#碳钢, 高温给水环境

Abstract：

Oxidation reduction potential (ORP) measurement can be an effective means for maintaining the state of feedwater for power station to be oxidizing, neutral, or reducing. In order to investigate the characteristics of ORP and its correlation with metal corrosion in high temperature water, a series of experiments including electrochemical measurement and simulated corrosion experiment were carried out. The results show that the ORP increases with the increase of dissolved oxygen content, while decreases with the increase of pH and temperature. Besides the flow rate has no effect on the ORP. It follows that ORP measurements for high-temperature and -pressure waters, as compared to the ones for low-temperature ORP waters, can act as a more sensitive and accurate method to effectively detect the trace amount of dissolved oxygen. In summary, ORP measurements can be used to understand, monitor and control the corrosion of steels in feedwater.

Key words： oxidation reduction potential dissolved oxygen content pH value 20# carbon steel high-temperature feedwater environment

收稿日期: 2017-09-27

ZTFLH:

TG172.4

基金资助:湖南省科技计划重点项目 (2013GK2016) 和湖南省研究生科研创新项目 (CX2017B488)

作者简介:

作者简介乔越,男,1992年生,硕士生

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引用本文:

乔越, 朱志平, 杨磊, 刘志峰. 高温状态下锅炉给水氧化还原电位监测与模拟实验研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 487-494.
Yue QIAO, Zhiping ZHU, Lei YANG, Zhifeng LIU. Monitoring and Simulated Experiments of Oxidation-Reduction Potential of Boiler Feedwater at High Temperatures. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 487-494.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.155 或 https://www.jcscp.org/CN/Y2018/V38/I5/487

图1 动态模拟测量试验装置

图2 不同温度下ORP随DO变化曲线

图3 不同温度下ORP与lgDO的关系

表1 不同温度下ORP-lgDO线性拟合式

图4 高温条件下ORP与氧含量对数的关系

图5 常温下ORP与pH值的关系

图6 高温下ORP与pH值的关系

表2 不同温度下ORP-pH线性拟合式

图7 80 ℃下ORP随水样流量变化趋势图

图8 ORP与温度的关系

图9 不同温度下ORP与DO、pH值的关系

表3 不同温度下ORP-DO-pH线性拟合式

表4 80 ℃下ORP经验计算值与测量值Wilcoxon检验统计结果

表5 120 ℃下ORP经验计算值与测量值Wilocoxon检验统计结果

图10 80 ℃下Fe-H2O体系电位-pH图

图11 80 ℃下Cu-H2O体系电位-pH图

图12 20#碳钢腐蚀电位与溶液ORP关系图

[1]	National Energy Administration.DL/T 1480-2015 Test method for oxidation-reduction potential of water [S]. Beijing: China Electric Power Press, 2015(国家能源局. DL/T 1480-2015 水的氧化还原电位测量方法[S].北京: 中国电力出版社, 2015)
[2]	Macdonald D D.Viability of hydrogen water chemistry for protecting in-vessel components of boiling water reactors[J]. Corrosion, 1992, 48: 194
[3]	Macdonald D D.Redox potential measurements in high temperature aqueous systems[J]. J. Electrochem. Soc., 1981, 128: 250
[4]	Jones R L, Nelson J L.Hydrogen water chemistry for BWRs: A status report on the EPRI development program[J]. Nucl. Eng. Des., 1990, 124: 33
[5]	Hicks P D, Grattan D A.Method and device for creating and analyzing an at temerature and pressure oxidation-reduction potential signature in hot water systems for preventing corrosion [P]. US Pat, US7955853, 2011
[6]	Gray D M.The role of dissolved oxygen and ORP measurements in power plant chemistry[J]. Power Plant Chem., 2008, 10: 320
[7]	Olson V G.Evaluating on-line high purity water oxidizing-reducing potential analysis for boiler feedwater quality[J]. Power Plant Chem., 2010, 12: 110
[8]	Gray D M.Practical quality assurance of on-line analytical measurements[J]. Power Plant Chem., 2010, 12: 492
[9]	Lendi M, Wuhrmann P.Impact of film-forming amines on the reliability of online analytical instruments[J]. Power Plant Chem., 2012, 14: 560
[10]	Hicks P D, Grattan D A, White P M, et al.Feedwater redox stress management: a detailed @T ORP? study at a coal-fired electric utility[J]. Power Plant Chem., 2007, 9: 324
[11]	Zheng L L, Dong J, Li H B, et al.Optimization of oxidation - reduction potential in water [A]. Annual Meeting of the Chinese Society for Environmental Science[C]. Haikou, 2016: 1045(郑琳琳, 董捷, 李海滨等. 水中氧化还原电位测定方法优化 [A]. 2016中国环境科学学会学术年会[C]. 海口, 2016: 1045)
[12]	Kerner Z, Balog J, Nagy G.Testing of high temperature reference electrodes for light water reactor applications[J]. Corros. Sci., 2006, 48(8): 1899
[13]	Xiang J, Xu L P, Li H P, et al.Research on and application of oxidation-reduction potential[J]. Earth Environ., 2014, 42: 430(向交, 徐丽萍, 李和平等. 氧化还原电位的研究及应用[J]. 地球与环境, 2014, 42: 430)
[14]	Xu H C, Xu X J, Wang K, et al.An analysis of factors affecting the oxidation reduction potential in drinking water[J]. J. Univ. Sci. Technol. Suzhou (Eng. Technol.), 2007, 20(2): 63(徐华成, 徐晓军, 王凯等. 饮用水氧化还原电位的影响因素分析[J]. 苏州科技学院学报(工程技术版), 2007, 20(2): 63)
[15]	Huang Q, Song J X, Wang S H, et al.Influencing factors of ORP measurement for reverse osmosis influent water in thermal power plants[J]. Ind. Water Treat., 2015, 35(6): 75(黄茜, 宋敬霞, 汪思华等. 火电厂反渗透进水ORP测量的影响因素[J]. 工业水处理, 2015, 35(6): 75)
[16]	Hoare J P.On the interaction of oxygen with platinum[J]. Electrochim. Acta, 1982, 27: 1751
[17]	Niedrach L W, Stoddard W H.Corrosion potentials and corrosion behavior of AISI 304 stainless steel in high-temperature water containing both dissolved hydrogen and oxygen[J]. Corrosion, 1986, 42: 696
[18]	Jia J M, Chen J G, Li Z G, et al.Countermeasures against massive exfoliation of oxidation scale on the internal surface of coarse grained 18-8 type stainless steel boiler tubes[J]. Electr. Power, 2008, 41(5): 37(贾建民, 陈吉刚, 李志刚等. 18-8系列粗晶不锈钢锅炉管内壁氧化皮大面积剥落防治对策[J]. 中国电力, 2008, 41(5): 37)
[19]	Lu J T, Gu Y F.High-temperature steam oxidation behavior of alloys used for key parts of the power plant boiler[J]. J. Chin. Soc. Corros. Prot., 2014, 34: 19(鲁金涛, 谷月峰. 电站锅炉关键部件材料高温蒸汽氧化研究进展[J]. 中国腐蚀与防护学报, 2014, 34: 19)
[20]	Liu C H, Shi G Z.Study on accurate control of feed-water oxygenated treatment for capital construction 1000 MW ultra-supercritical unit[J]. Technol. Water Treat., 2013, 39(6): 109(刘春红, 施国忠. 基建超超临界1000 MW机组精确给水加氧处理技术的研究[J]. 水处理技术, 2013, 39(6): 109)
[21]	Chen T Y, Moccari A A, Macdonald D D.Development of controlled hydrodynamic techniques for corrosion testing[J]. Corrosion, 1992, 48: 239
[22]	Macdonald D D, Lin C C.Discussion on "electrochemical potential measurements under simulated BWR water chemistry conditions"[J]. Corrosion, 1993, 49: 90
[23]	Eason E D.Modeling ECP of stainless steel in simulated BWR environments with hydrogen peroxide addition [R]. Palo Alto, CA: Electric Power Research Institute, 1991
[24]	Shu Y D, Yang X Y.Modern Electrochemical Research Methods [M]. Changsha: Central South University Press, 2015: 34(舒余德, 杨喜云著. 现代电化学研究方法 [M]. 长沙: 中南大学出版社, 2015: 34)
[25]	Zhou B Q, Chen Z H.Water Treatment in the Thermal Power Plant [M]. 4th Ed.,Beijing: China Electric Power Press, 2009: 595(周柏青, 陈志和. 热力发电厂水处理 [M]. 第4版. 中国电力出版社, 2009: 595)

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