| Failure analysis of corrosion cracking and simulated testing for a fluid catalytic cracking unit |
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| 作者姓名： | HuaChen XiaogangLi ChaofangDong MingLi JinwenYang |
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| 作者单位： | [1]MaterialsScienceandEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083 [2]MaterialsScienceandEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083／／StateKeyLaboratoryforCorrosionandProtection,InstituteofMetalResearch,ChineseAcademyofSciences,Shenyang110016,China [3]JiujiangBranchCorp.ofSINOPEC,Jiujiang332000 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，Petrochemical Company of China fund |
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| 摘 要： | The failure of a fluid catalysis and cracking unit (FCCU) in a Chinese refinery was investigated by using nondestructive detection methods, fracture surface examination, hardness measurement, chemical composition and corrosion products analysis. The results showed that the failure was caused by the dew point nitrate stress corrosion cracking. For a long operation period, the wall temperature of the regenerator in the FCCU was below the fume dew point. As a result, an acid fume NOx-SOx-H2O medium presented on the surface, resulting in stress corrosion cracking of the component with high residual stress. In order to confirm the relative conclusion, simulated testing was conducted in laboratory, and the results showed similar cracking characteristics. Finally, some suggestions have been made to prevent the stress corrosion cracking of an FCCU from re-occurring in the future.
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| 关 键 词： | 故障分析方法 模拟测试技术 催化裂化装置 炼油工业 再生器 |
Failure analysis of corrosion cracking and simulated testing for a fluid catalytic cracking unit |
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| HuaChen XiaogangLi ChaofangDong MingLi JinwenYang.Failure analysis of corrosion cracking and simulated testing for a fluid catalytic cracking unit[J].Journal of University of Science and Technology Beijing,2005,12(2):172-177. |
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| Authors: | Hua Chen Xiaogang LI Chaofang Dong Ming Li Jinwen Yang |
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| Abstract: | The failure of a fluid catalysis and cracking unit (FCCU) in a Chinese refinery was investigated by using nondestructive detection methods, fracture surface examination, hardness measurement, chemical composition and corrosion products analysis. The results showed that the failure was caused by the dew point nitrate stress corrosion cracking. For a long operation period, the wall temperature of the regenerator in the FCCU was below the fume dew point. As a result, an acid fume NOx-SOx-H2O medium presented on the surface, resulting in stress corrosion cracking of the component with high residual stress. In order to confirm the relative conclusion, simulated testing was conducted in laboratory, and the results showed similar cracking characteristics. Finally, some suggestions have been made to prevent the stress corrosion cracking of an FCCU from re-occurring in the future. |
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| Keywords: | stress corrosion cracking fluid catalytic cracking unit dew point failure |
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