火力发电厂末级再热器G102钢管泄漏原因  

Causes of leakage of final reheater G102 steel pipe in thermal power plant

作　　者：王庆峰 WANG Qingfeng(North China Electric Power Test and Research Institute,China Datang Corporation Science and Technology General Research Institute Co.,Ltd.,Beijing 100040,China)

机构地区：[1]中国大唐集团科学技术研究总院有限公司、华北电力试验研究院,北京100040

出　　处：《理化检验（物理分册）》2023年第10期52-57,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某大型火力发电厂末级再热器G102钢管发生泄漏,采用宏观观察、化学成分分析、金相检验、扫描电镜及能谱分析、力学性能测试等方法分析了泄漏原因。结果表明:末级再热器G102钢管段运行了16万小时,组织老化、性能严重劣化;G102钢管管段内、外壁氧化皮影响了热交换,使金属壁温升高,加速了材料组织老化、性能劣化,最终使G102钢管达到蠕变寿命后期,并发生泄漏;设计及结构因素也加速了材料组织老化和性能劣化。最后对末级再热器G102钢管的安全稳定运行提出了相关建议。Leakage occurred to the G102 steel pipe of the final reheater in a large thermal power plant.The causes of leakage were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination,scanning electron microscopy and energy spectrum analysis,and mechanical property test.The results show that the G102 steel pipe section of the final reheater had been running for 160,000 hours,and the structure was aging and the performance was seriously degraded.The oxide skin of the inner and outer walls of the G102 steel pipe section affected the heat exchange,increased the temperature of the metal wall,accelerated the aging of the material structure and the deterioration of the performance,and finally made the G102 steel pipe reach the later stage of creep life and leak.The design and structural factors also accelerated the aging and performance degradation of the material.Finally,some suggestions were put forward for the safe and stable operation of the G102 steel pipe of the final reheater.

关 键 词：末级再热器 组织老化 氧化皮 G102钢 泄漏 

分 类 号：TG115.2[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]