摘要
采用宏观检查、化学成分分析、显微组织分析、扫描断口观察以及能谱分析等方法,对二联合加氢改质反应流出物蒸汽发生器管板/换热管泄漏原因进行了分析。分析结果表明:该换热管泄漏主要是因为胀接工艺不当,管子与管孔缝隙处发生碱脆引起开裂,开裂后管程介质渗出,在开裂处又形成高温硫化物腐蚀,腐蚀进一步加剧,最终导致设备停用。
Leakage of steam generator tube sheet/heat exchanger tube was analyzed by means of macroscopic examination, chemical composition analysis, microstructural analysis, scanning fracture observation and energy spectrum analysis. It is concluded that alkali brittleness cracks was caused by improper expansion process. As a result, high-temperature sulfide stress corrosion accumulated on cracking position which aggravated corrosion process and resulted in equipment shutdown.
作者
李金梅
齐文宽
蒋春宏
史伟
杨莉
LI Jinmei;QI Wenkuan;JIANG Chunhong;SHI Wei;YANG Li(Lanzhou LS Test Technology Co.,Ltd.,Lanzhou 730314,China;Gansu Engineering Laboratory of Materials Characterization and Safety Evaluation for Machinery Equipment,Lanzhou 730314,China)
出处
《石油化工腐蚀与防护》
CAS
2019年第4期51-54,共4页
Corrosion & Protection In Petrochemical Industry
关键词
管板
换热管
碱脆
高温硫化物腐蚀
tube sheet
heat exchanger tube
alkali brittleness
high-temperature sulfide corrosion