电站汽水系统流动加速腐蚀机理及对策研究
发布时间：2018-08-26 11:50
【摘要】：电站汽水系统流动加速腐蚀(FAC)导致了很多重大事故,比如1995年Pleasant Prairie火力发电厂因FAC造成了5死6伤的严重事故,2004年日本美滨电厂因FAC造成了4死4伤的严重事故,这些事故引起了世界各国对于FAC的重视。目前随着我国超临界机组的爆发式增长,也发生了一些因腐蚀产生的爆管问题,因此本课题的研究对于抑制这种事故的产生具有一定的意义。 流动加速腐蚀是一个碳钢或者低合金钢表面保护性氧化膜溶解到水流或者湿蒸汽中的电化学腐蚀过程。此过程造成了管道壁面的减薄,进而造成了管道设备使用寿命的减短以及安全运行性能的降低。FAC机理可以从动静态两个方面进行理解,从动态角度进行理解,它是静态水中均匀腐蚀的延伸。 本文深入研究了流动加速腐蚀的机理、特征、易产生部位以及影响因素,较为系统的阐述了流动加速腐蚀。通过对于流动加速腐蚀的研究,本文对现有的加氧处理技术和工艺做了改进,提出了一种新的给水处理方式。最后本文以某超临界机组为案例深入分析了管道钝化过程的实验,并综合分析了各个参数对于FAC的影响,提出了抑制FAC的对策,对于电厂化学控制具有一定的指导意义。
[Abstract]:The accelerated corrosion of (FAC) in steam and water systems in power stations has led to many serious accidents, such as the five deaths and six injuries caused by FAC in the Pleasant Prairie thermal power plant in 1995, and the four deaths and four injuries caused by FAC in the Meihama power plant in Japan in 2004. These accidents have aroused the attention of countries all over the world to FAC. At present, with the explosive growth of supercritical units in our country, there are some pipe burst problems caused by corrosion, so the research of this subject has certain significance to restrain the occurrence of this kind of accident. Flow-accelerated corrosion is an electrochemical corrosion process in which a protective oxide film on the surface of carbon steel or low alloy steel is dissolved into water or wet steam. This process has resulted in the thinning of the pipe wall, and thus resulted in the reduction of the service life of the pipeline equipment and the reduction of the safety performance. FAC mechanism can be understood from the dynamic and static aspects, and from the dynamic point of view, the mechanism can be understood from the dynamic point of view. It is an extension of uniform corrosion in static water. In this paper, the mechanism, characteristics, location of flow accelerated corrosion and its influencing factors are studied, and the flow accelerated corrosion is systematically expounded. Through the study of flow accelerated corrosion, the existing technology and process of oxygen treatment are improved, and a new treatment method of feed water is put forward. Finally, taking a supercritical unit as an example, the experiment of pipeline passivation process is deeply analyzed, and the influence of each parameter on FAC is analyzed synthetically, and the countermeasures to restrain FAC are put forward, which is of certain guiding significance for the chemical control of power plant.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
[Abstract]:The accelerated corrosion of (FAC) in steam and water systems in power stations has led to many serious accidents, such as the five deaths and six injuries caused by FAC in the Pleasant Prairie thermal power plant in 1995, and the four deaths and four injuries caused by FAC in the Meihama power plant in Japan in 2004. These accidents have aroused the attention of countries all over the world to FAC. At present, with the explosive growth of supercritical units in our country, there are some pipe burst problems caused by corrosion, so the research of this subject has certain significance to restrain the occurrence of this kind of accident. Flow-accelerated corrosion is an electrochemical corrosion process in which a protective oxide film on the surface of carbon steel or low alloy steel is dissolved into water or wet steam. This process has resulted in the thinning of the pipe wall, and thus resulted in the reduction of the service life of the pipeline equipment and the reduction of the safety performance. FAC mechanism can be understood from the dynamic and static aspects, and from the dynamic point of view, the mechanism can be understood from the dynamic point of view. It is an extension of uniform corrosion in static water. In this paper, the mechanism, characteristics, location of flow accelerated corrosion and its influencing factors are studied, and the flow accelerated corrosion is systematically expounded. Through the study of flow accelerated corrosion, the existing technology and process of oxygen treatment are improved, and a new treatment method of feed water is put forward. Finally, taking a supercritical unit as an example, the experiment of pipeline passivation process is deeply analyzed, and the influence of each parameter on FAC is analyzed synthetically, and the countermeasures to restrain FAC are put forward, which is of certain guiding significance for the chemical control of power plant.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
【参考文献】
相关期刊论文 前7条
1 周臣;钱洲亥;祝郦伟;肖修林;于志勇;冯礼奎;曹求洋;;锅炉给水加氧处理中钝化膜性能的试验研究[J];电力建设;2011年07期
2 刘春波;郑玉贵;;核电行业中流动促进腐蚀的模型和数值模拟研究进展[J];腐蚀科学与防护技术;2008年06期
3 束国刚;薛飞;怓文新;汪小龙;陆念文;刘鹏;戴忠华;;核电厂管道的流体加速腐蚀及其老化管理[J];腐蚀与防护;2006年02期
4 谭华安;;给水加氧技术在节能降耗上的应用[J];广州化工;2011年04期
5 Masanori Naitoh;陈耀东;Shunsuke Uchida;Hidetoshi Okada;;流动加速腐蚀引起的管壁减薄分析及验证[J];金属学报;2011年07期
6 李志刚,李贵成,沈保中,龚秋霖;华能石洞口电厂600MW超临界机组给水加氧、加氨联合处理应用研究[J];热力发电;1998年06期
7 黄兴德;游U，
本文编号：2204780
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2204780.html
