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| THE FAILURE ANALYSIS OF THE SECONDARY SUPERHEATER TUBES IN WASTE HEAT BOILER IN THE PRODUCTION OF SULFURIC ACID FROM SULFUR |
| Li Shouchen Zhang Lihua Situ Meijuan Coo Tieliang Shi Shengtai (Shanghai Institute of Metallurgy; Academia Sinica) |
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Abstract In order to find out the causes of failure of the secondary superheater tubes in waste heat boiler in the production of sulfuric acid from sulfur, samples from an uncoated 12CrMoV tube after ten months' service, an aluminium-sprayed 12CrMoV tube and an 18-8 stainless steel tube both after one year service in the Nanjing Fertilizer Plant have been examined by metallography, EMPA, X-ray diffraction and chemical analysis. Results obtained indicate that service failure of the secondary superheater tubes was mainly caused by the corrosion of tube surface, the nature of corrosion was high temperature sulfidation and oxidation.The uncoated 12CrMoV tube suffered from severe corrosion, and the corrosion products consisted of nonprotective oxide and sulfide of iron, while the aluminium-sprayed 12CrMoV tube and the 18-8 stainless steel tube had much better performance in this corrosion environment, because of the formation of protective Al_2O_3 and Cr_2O_3 scale which appeared to prevent ingress of oxygen and sulfur to the metal.On the basis of experimental results, possible mechanisms of corrosion and methods of solving the corrosion problem are proposed.
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Received: 25 April 1988
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Cite this article:
Li Shouchen Zhang Lihua Situ Meijuan Coo Tieliang Shi Shengtai (Shanghai Institute of Metallurgy; Academia Sinica). THE FAILURE ANALYSIS OF THE SECONDARY SUPERHEATER TUBES IN WASTE HEAT BOILER IN THE PRODUCTION OF SULFURIC ACID FROM SULFUR. J Chin Soc Corr Pro, 1988, 8(2): 159-165.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1988/V8/I2/159
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