理化检验-物理分册2024，Vol.60Issue(5)：74-78,5.DOI:10.11973/lhjy-wl202405019
超超临界火电机组给水泵汽轮机20Cr13钢动叶片断裂原因
Cause of 20Cr13 steel moving blade fracture in the feed pump turbine of ultra supercritical thermal power units
臧利永 1张涛2
作者信息
- 1. 内蒙古京宁热电有限责任公司,乌兰察布 012000
- 2. 内蒙古电力科学研究院,呼和浩特 010020
- 折叠
摘要
Abstract
During the operation of a certain ultra supercritical unit,a fracture accident occurred on the fourth stage 20Cr13 steel moving blade of the feedwater pump turbine.The causes of blade fracture were analyzed using methods such as macroscopic observation,chemical composition analysis,metallographic examination,mechanical property testing,scanning electron microscopy and energy spectrum analysis.The results show that some moving blades of the feed pump turbine were improperly assembled,and the gap between the blade root and the blade root groove was too large,resulting in obvious loosening of the blades.During the long term high speed rotation of the rotor,the blades bore a high level of alternating cyclic load.Some moving blade roots with large assembly gaps and the contact area of the blade root groove experienced micro fatigue damage.The circumferential edge of the blade root underwent bi-directional multi-source fatigue cracking,and the cracks gradually expanded,ultimately led to blade fracture.关键词
给水泵汽轮机/动叶片/断裂/微动疲劳/装配间隙/交变循环载荷Key words
feed pump turbine/moving blade/fracture/micro motion fatigue/assembly clearance/alternating cyclic load分类
通用工业技术引用本文复制引用
臧利永,张涛..超超临界火电机组给水泵汽轮机20Cr13钢动叶片断裂原因[J].理化检验-物理分册,2024,60(5):74-78,5.
