基于损伤模式的在役冷凝器湿硫化氢应力腐蚀案例分析

Case Study of Set Hydrogen Sulfide Stress Corrosion of In-service Condenser Based on Damage Mode

首先叙述了冷凝器的作用和定义以及特种设备安全的重要性,由于压力容器运行中受到设备本身、外界环境、压力、温度与介质等多种因素的影响,导致在役压力容器出现不同形态的损伤模式。概述了承压类特种设备损伤模式腐蚀减薄、环境开裂、材质劣化、机械损伤的分类,进而探讨了在役压力容器设备损伤模式基本数据的资料确定、在役压力容器损伤模式筛查及基于损伤形态和失效形态的主要损伤模式确认。最后研究分析了一台典型在役冷凝器湿硫化氢应力腐蚀案例,包括冷凝器出现异常的确认,现场情况核查,冷凝器设备资料档案的审查,设备使用环境的甄别,以及具体的湿硫化氢应力腐蚀模式的确认,目的在于进一步保证在役压力容器运行的安全性能,以期对以后的相类似压力容器检验检测工作起到一定的指导作用。

Firstly,the function and definition of condenser and accident safety of special equipment are described.The operation of pressure vessel is affected by various factors such as equipment province,external environment,pressure,temperature and medium,this results in different damage modes of the pressure vessel in service.The classification of damage modes such as corrosion thinning,environmental cracking,material degradation and mechanical damage of pressure special equipment is summarized.Further,the determination of basic data of damage mode of in-service pressure vessel equipment,screening of damage modes of in-service pressure vessels and confirmation of main damage modes based on damage and failure modes are discussed.Finally,a typical wet hydrogen sulfide stress corrosion case of in-service condenser is studied and analyzed,including the confirmation of condenser anomalies,field situation verification,review of condenser equipment data files,identification of equipment use environment and confirmation of specific wet hydrogen sulfide stress corrosion mode.The purpose is to further ensure the safety performance of the in-service pressure vessel,and to play a certain guiding role for the inspection and testing of similar pressure vessels in the future.