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| 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) |
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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.
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Received: 25 April 1988
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Cite this article:
Li Shouchen Zhang Lihua Situ Meijuan Cao Tieliang Shi Shengtai (Shanghai Instiute of Metallurgy; Academia Sinica). 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.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1988/V8/I2/166
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