某四角切向燃烧锅炉12Cr1MoV钢高温过热器爆管失效模式研究  

Study on Tube Burst Failure Mode of 12Cr1MoV Steel High Temperature Superheater of a Tangentially-Fired Boiler

作　　者：李俊 谷树超 蒋鹏 王松 LI Jun;GU Shuchao;JIANG Peng;WANG Song(Shanghai Minghua Electric Power Science&Technology Co.,Ltd.,Shanghai 200090,China)

机构地区：[1]上海明华电力科技有限公司,上海200090

出　　处：《锅炉技术》2023年第5期54-60,共7页Boiler Technology

摘　　要：针对某电厂四角切向燃烧锅炉12Cr1MoV高温过热器管近年来发生多次爆管事故,结合其锅炉结构、爆管现场检验结果与爆管失效分析结果,研究其过热器爆管失效模式及机理。研究发现:过热器爆管均为过热失效,爆口位置主要在管屏迎烟侧,其迎烟侧和背烟侧材料力学性能、组织球化和氧化皮厚度普遍存在明显的差异。研究表明:在炉内高温烟气作用下,过热器局部管屏迎烟侧管壁超温,由此引起其组织球化、材料力学性能劣化、蠕变裂纹的生成,多项因素的叠加导致最终爆管。Several high-temperature superheater tube burst accidents have occurred in a tangentially-fired boiler in recent years.The failure mode and mechanism of burst tube of superheater were studied by combining the boiler structure,tube field inspection results and tube failure analysis results.It was found that all the tubes of superheater failed due to overheating,and the explosion location was mainly on the smoke facing side of the tube.There were obvious differences in the mechanical properties,microstructure spheroidization and oxide thickness between the smoke facing side and the back side.The results show that under the action of high temperature flue gas in the furnace,same tubes of the superheater were overheated,which lead to the spheroidization of microstructure,the deterioration of the mechanical properties of the material and the generation of creep cracks,resulting in the final tube failure.

关 键 词：过热器 爆管 氧化皮 12CR1MOV 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]