火电厂燃煤锅炉引风机主轴开裂的原因分析
Cause Analysis of Main Shaft Cracking of Induced Draft Fan of Coal-fired Boiler in a Power Plant
赵扶起 1王鹏 1周浩 2图嘎2
作者信息
- 1. 内蒙古大唐国际托克托发电有限责任公司,呼和浩特 010200
- 2. 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 100043
- 折叠
摘要
某火电厂燃煤锅炉引风机主轴运行约86 600 h,未到设计寿命即发生了开裂故障,为查明引风机主轴开裂的原因,通过宏观形貌分析、化学成分检验、显微组织分析及力学性能检验等方法进行了综合分析.结果表明,引风机主轴的化学成分、组织、布氏硬度及屈服强度均不符合国家标准要求,且其内部组织不均匀.分析认为,在运行过程中引风机中轴的表面发生了明显的磨损,出现应力集中的现象,这会导致主轴开裂.主轴开裂的主要原因是其承受力不足,且主轴材料的热处理工艺不当会降低引风机主轴的综合力学性能,加速其裂纹的扩展.最后提出了预防引风机主轴开裂的技术建议.
Abstract
The main shaft of induced draft fan of a coal-fired boiler runs for about 86 600 h and cracks occur be-fore its design life.A comprehensive analysis is carried out by means of macroscopic morphology analysis,chemical composition examination,microstructure analysis and mechanical properties examination.The results show that the chemical composition,microstructure,brinell hardness and yield strength of the spindle do not meet the standard requirements,and the microstructure is not uniform.The analysis shows that the obvious wear marks on the surface of the shaft in the course of running,which cause stress concentration.Insufficient bearing capacity of the shaft is the main cause of cracking,and due to improper heat treatment process,the com-prehensive mechanical properties of the main shaft of the induced draft fan are reduced,and the crack propaga-tion is accelerated.Finally,the technical suggestions to prevent the main shaft crack of induced draft fan are put forward.
关键词
火电厂/燃煤锅炉/引风机主轴/开裂/综合分析/运行工况Key words
power plant/coal-fired boiler/main shaft of induced draft fan/cracking/comprehensive analysis/oper-ating condition引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据