Failure analysis of corrosion cracking and simulated testing for a fluid catalytic cracking unit

作     者：HuaChen XiaogangLi ChaofangDong MingLi JinwenYang 

作者机构：MaterialsScienceandEngineeringSchoolUniversityofScienceandTechnologyBeijingBeijing100083 MaterialsScienceandEngineeringSchoolUniversityofScienceandTechnologyBeijingBeijing100083／／StateKeyLaboratoryforCorrosionandProtectionInstituteofMetalResearchChineseAcademyofSciencesShenyang110016China JiujiangBranchCorp.ofSINOPECJiujiang332000 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2005年第12卷第2期

页      面：172-177页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：This work was financially supported by the Major State Basic Research Development Program of China (973 Program No.19990970) and Petrochemical Company of China 

主　　题：stress corrosion cracking fluid catalytic cracking unit dew point failure 

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 present- ed 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 sug- gestions have been made to prevent the stress corrosion cracking of an FCCU from re-occurring in the future.