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| Corrosion Mechanism of Key Heat Exchanger Tubes for Diesel Hydrogenation Unit |
| Received:May 02, 2017 Revised:September 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.09.013 |
| KeyWord:diesel hydrogenation unit heat exchanger tube 15CrMo steel 321 stainless steel corrosion mechanism |
| Author | Institution |
| XU Xiu-qing |
Tubular Goods Research Institute of China National Petroleum Corporation, Xi′an , China |
| LIU Jin-wen |
Jian′an Company of Changqing Oilfield Machinery Manufacturing General Factory, Xi′an , China |
| LAI Wei-ya |
Tubular Goods Research Institute of China National Petroleum Corporation, Xi′an , China |
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| Abstract: |
| Object To make clear the cause of corrosion failure of refinery heat exchanger tubes (15CrMo steel and 321 stainless steel) for diesel hydrogenation unit of Lanzhou Petrochemical Company. Methods High-temperature autoclave was used to test and simulate the corrosion mechanism of 15CrMo and 321 stainless steel in corrosion medium. Results The failure form of 15CrMo steel exhibited quick uniform corrosion under ammonium salt scale and pitting corrosion for others. On the contrary, the main failure form of 321 stainless steel showed pitting under ammonium salt scale. Conclusion To avoid corrosion perforation caused by ammonium salt crystallization, it is suggested to improve the outlet temperature of the heat exchanger to 230 ℃ above, change the water injection technology for the outlet of the heat exchanger to note neutralization corrosion inhibitor, and supply a dechlorination can at the outlet of the hydrogenation reactor. |
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