水冷壁高温腐蚀倾向判断及H2S近壁面许用浓度研究

doi:10.11930/j.issn.1004-9649.201707164

中国电力 ›› 2018, Vol. 51 ›› Issue (7): 113-119.DOI: 10.11930/j.issn.1004-9649.201707164

水冷壁高温腐蚀倾向判断及H₂S近壁面许用浓度研究

许伟刚^1,2, 谭厚章², 刘原一², 魏博², 惠世恩²

1. 常州大学机械工程学院, 江苏常州 213164;
2. 热流科学与工程教育部重点实验室(西安交通大学), 陕西西安 710049

收稿日期:2017-07-25 修回日期:2018-01-23 出版日期:2018-07-05 发布日期:2018-07-31
作者简介:许伟刚(1987-),男,博士,从事锅炉高温腐蚀机理及防治研究,E-mail:451151098@qq.com;谭厚章(1965-),男,博士,教授,博导,从事煤粉洁净燃烧、生物质燃烧与结焦模拟、大型火电厂锅炉与关键辅机节能理论与应用等方面的教学与研究,E-mail:tanhz@mail.xjtu.edu.cn

Research on Determination of High Temperature Corrosion Tendency of Water Walls and Limiting Concentration Range of H₂S Near Walls

XU Weigang^1,2, TAN Houzhang², LIU Yuanyi², WEI Bo², HUI Shi'en²

1. School of Mechanical Engineering, Changzhou University, Changzhou 213164, China;
2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE(Xi'an Jiaotong University), Xi'an 710049, China

Received:2017-07-25 Revised:2018-01-23 Online:2018-07-05 Published:2018-07-31

摘要/Abstract

摘要： 为预防日益严重的锅炉水冷壁高温腐蚀，在300MW燃煤锅炉上研究了近壁面气氛分布规律，结合不同气氛下水冷壁材料12Cr1MoV的高温腐蚀动力学试验数据，预测了不同温度、气氛、腐蚀层开裂周期下的高温腐蚀速率，从而提出不同运行时间下锅炉水冷壁腐蚀的倾向判断标准；建立了腐蚀速率与H₂S浓度、腐蚀时间和腐蚀层开裂周期的关系式，并以腐蚀膜开裂周期12h和24h为例，求得了近壁面气氛的许用浓度。研究结果表明，近壁面硫化氢（H₂S）浓度与一氧化碳（CO）浓度成正比，而与氧气（O₂）浓度成反比；高温腐蚀速率与时间符合抛物线关系，与温度符合阿雷尼乌斯定律；只要将近壁面气氛控制在对应的H₂S许用浓度范围以内，就可以预防严重高温腐蚀的发生。

关键词: 燃煤锅炉, 水冷壁, 高温腐蚀, 硫化氢, 腐蚀判据, 腐蚀膜开裂

Abstract: To prevent the increasingly serious problems of high temperature corrosion of water walls in boilers, the research on the distribution of the near wall atmosphere is carried out in a 300MW boiler. With the test data of high temperature corrosion kinetics of the water wall materials 12Cr1MoV, the corrosion rate under different temperature, atmosphere and cracking period of corrosion layer is forecasted such that the corrosion tendency standard of water walls in boilers at different running time is put forward. The relationship between the corrosion rate and the H₂S concentration, the corrosion time and the cracking period of the corrosion film is established, and the limiting concentration of atmosphere near walls is obtained with the cracking period of 24 h and 48 h as examples. The results show that the concentration of H₂S near walls is proportional to the concentration of CO, but inversely proportional with the concentration of O₂. The high temperature corrosion rate change with time follows the parabolic law, while the change with temperature complies with the Arrhenius law. and the change with H₂S concentration follows the exponential law. As long as the atmosphere near walls is controlled within the limiting concentration range, the serious high temperature corrosion could be prevented.

Key words: coal fired boiler, water walls, high temperature corrosion, H₂S, corrosion judging standard, cracking of corrosion film

中图分类号:

TK223

许伟刚, 谭厚章, 刘原一, 魏博, 惠世恩. 水冷壁高温腐蚀倾向判断及H₂S近壁面许用浓度研究[J]. 中国电力, 2018, 51(7): 113-119.

XU Weigang, TAN Houzhang, LIU Yuanyi, WEI Bo, HUI Shi'en. Research on Determination of High Temperature Corrosion Tendency of Water Walls and Limiting Concentration Range of H₂S Near Walls[J]. Electric Power, 2018, 51(7): 113-119.

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https://www.electricpower.com.cn/CN/Y2018/V51/I7/113

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水冷壁高温腐蚀倾向判断及H₂S近壁面许用浓度研究

Research on Determination of High Temperature Corrosion Tendency of Water Walls and Limiting Concentration Range of H₂S Near Walls

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