硫铁矿制酸系统余热锅炉二级过热器管失效原因分析

中国腐蚀与防护学报

1988, Vol. 8

Issue (2): 166-172

研究报告

本期目录 | 过刊浏览

硫铁矿制酸系统余热锅炉二级过热器管失效原因分析

李守臣;张丽华;司徒美娟;曹铁梁;石声泰

中国科学院上海冶金研究所;中国科学院上海冶金研究所;中国科学院上海冶金研究所;中国科学院上海冶金研究所;中国科学院上海冶金研究所

THE FAILURE ANALYSIS OF SECONDARY SUPERHEATER TUBES IN WASTE HEAT BOILER IN THE PRODUCTION OF SULFURIC ACID FROM PYRITE

Li Shouchen Zhang Lihua Situ Meijuan Cao Tieliang Shi Shengtai (Shanghai Instiute of Metallurgy; Academia Sinica)

全文: PDF(1468 KB)

摘要: 分析了余热锅炉中二级过热器管(材质为12CrMoV)的失效原因,结果表明管子的腐蚀和超温可能与失效过程有关,但管子表面腐蚀是二级过热器管失效的主要原因。利用X-射线衍射、金相、电子探针、红外、差热分析和化学分析等方法,研究了取自现场的腐蚀产物形貌、化学组份和结构。腐蚀产物主要是Fe_2O_3、Fe_2(SO_4)_3和铁的硫化物。因此腐蚀机制可能是Fe_2(SO_4)_3在高温下分解产生高分压的SO_3所引起的硫化和氧化。在分析结果的基础上,提出了解决这种问题的可能途径。

Abstract：Exploration of the causes of failure of secondary superheater tubes made of 12CrMoV in waste heat boiler has been carried out. The results show that corrosion of tube surface is responsible for the service failure of secondary superheater tubes, though erosion and superheating of tubes may be involved in the failure processes.The structure, chemical composition and morphology of corrosion products on the damaged tube were studied by means of X-ray diffraction metallography, EMPA, IR, DTA and chemical analysis. The corrosion products are mainly composed of Fe_2O_3, Fe_2 (SO_4)_3 and sulfide of iron. Therefore, it is snggested that the mechanism of corrosion is sulfidation and oxidation caused by high partial pressure of SO_3 from decomposition of Fe_2 (SO_4)_3 at elevated temperatures in the system.On the basis of experimental results, possible methods to combat corrosion are proposed.

收稿日期: 1988-04-25

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引用本文:

李守臣;张丽华;司徒美娟;曹铁梁;石声泰. 硫铁矿制酸系统余热锅炉二级过热器管失效原因分析[J]. 中国腐蚀与防护学报, 1988, 8(2): 166-172.
. THE FAILURE ANALYSIS OF SECONDARY SUPERHEATER TUBES IN WASTE HEAT BOILER IN THE PRODUCTION OF SULFURIC ACID FROM PYRITE. J Chin Soc Corr Pro, 1988, 8(2): 166-172.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1988/V8/I2/166

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[2] 吴非文,火力发电厂高温金属运行,p.332～341
[3] 上海闸北发电厂金属监督试验组,上海硫酸厂中压硫酸余热锅炉过热器管爆破事故分析报告,p.3～4,(1984)
[4] 张克忠、苏元复.无机工业化学,商务印书馆,P.110～112,(1950) .
[5] 李守臣、张丽华、司徒美娟,模拟硫酸铁分解引起的加速腐蚀试验(待发表).

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