【摘要】：電站汽水系統(tǒng)流動(dòng)加速腐蝕(FAC)導(dǎo)致了很多重大事故,比如1995年P(guān)leasant Prairie火力發(fā)電廠因FAC造成了5死6傷的嚴(yán)重事故,2004年日本美濱電廠因FAC造成了4死4傷的嚴(yán)重事故,這些事故引起了世界各國對(duì)于FAC的重視。目前隨著我國超臨界機(jī)組的爆發(fā)式增長,也發(fā)生了一些因腐蝕產(chǎn)生的爆管問題,因此本課題的研究對(duì)于抑制這種事故的產(chǎn)生具有一定的意義。 流動(dòng)加速腐蝕是一個(gè)碳鋼或者低合金鋼表面保護(hù)性氧化膜溶解到水流或者濕蒸汽中的電化學(xué)腐蝕過程。此過程造成了管道壁面的減薄,進(jìn)而造成了管道設(shè)備使用壽命的減短以及安全運(yùn)行性能的降低。FAC機(jī)理可以從動(dòng)靜態(tài)兩個(gè)方面進(jìn)行理解,從動(dòng)態(tài)角度進(jìn)行理解,它是靜態(tài)水中均勻腐蝕的延伸。 本文深入研究了流動(dòng)加速腐蝕的機(jī)理、特征、易產(chǎn)生部位以及影響因素,較為系統(tǒng)的闡述了流動(dòng)加速腐蝕。通過對(duì)于流動(dòng)加速腐蝕的研究,本文對(duì)現(xiàn)有的加氧處理技術(shù)和工藝做了改進(jìn),提出了一種新的給水處理方式。最后本文以某超臨界機(jī)組為案例深入分析了管道鈍化過程的實(shí)驗(yàn),并綜合分析了各個(gè)參數(shù)對(duì)于FAC的影響,提出了抑制FAC的對(duì)策,對(duì)于電廠化學(xué)控制具有一定的指導(dǎo)意義。
[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.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621

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本文編號(hào)：2204780