超临界直流锅炉引风机叶片断裂原因分析  

Analysis of the Blade Cracks of the ID Fan of a Supercritical Once Through Boiler

作　　者：郭春晖 王涛 刘艺虹 GUO Chunhui;WANG Tao;LIU Yihong(China Energy Group Shandong Electric Power Co.,Ltd.,Jinan 250000,China;China Energy Feixian Power Generation Co.,Ltd.,Linyi 273425,China)

机构地区：[1]国家能源集团山东电力有限公司,山东济南250000 [2]国家能源费县发电有限公司,山东临沂273425

出　　处：《山东电力技术》2021年第3期72-76,共5页Shandong Electric Power

基　　金：国家能源集团新技术新工艺类项目“#1、2炉引风机可靠性升级改造”(CHN ENERGY-火电板块-2020-502)。

摘　　要：某超临界机组锅炉轴流引风机运行中发生两次叶片断裂,通过对断裂叶片样本进行宏观检验、化学成分分析、金相分析、硬度检测和常温机械性能检验等试验分析,并通过风机阻力特性分析了风机与锅炉风烟系统的匹配性。分析结果表明导致风机叶片断裂的主要因素是裂纹源和应力,叶片受烟气作用力长时间在高位区间,加剧了叶片应力疲劳。In order to analyze the cause of the blade fracture of the axial⁃flow induced draft fan of a supercritical boiler,the macro examination,chemical composition analysis,metallographic analysis,hardness test and mechanical property test at room temperature were carried out on the fractured blade samples.The matching between the fan and the air and flue gas system of the boiler was analyzed through the resistance characteristics of the fan.The results show that the main factors leading to the fracture of fan blade are crack source and stress.The stress fatigue of the blade is aggravated when the blade is subjected to flue gas force for a long time in the high position range.

关 键 词：叶片断裂 金相分析 裂纹源 应力疲劳 

分 类 号：TK223.27[动力工程及工程热物理—动力机械及工程]