理化检验-物理分册2016，Vol.52Issue(12)：888-891,896,5.DOI:10.11973/lhjy-wl201612012
300MW亚临界机组锅炉屏式过热器管爆裂原因分析
Bursting Causes Analysis of Platen Superheater Tube of a 300 MW Sub-critical Unit
句光宇1
作者信息
- 1. 中国大唐集团科学技术研究院有限公司华中分公司,郑州450000
- 折叠
摘要
Abstract
The T91 (10Cr9Mo1VNb) steel platen superheater tube of a boiler burst after 8 × 104 h service and the bursting reasons were analyzed by means of macroscopic analysis,metallographic examination,hardness test,and SEM and EDS analysis.The results show that because of longtime overheating,bulge firstly appeared on the brush-fire superheater tube,then the elbow constantly deformed and burst when its stress reached the creep rupture strength.The mechanism of first fracture site was plastic fracture while the mechanism of rest was brittle fracture.The main reason of bursting of the platen superheater tube was longtime overheating,which resulted in serious aging and significant creep of microstructure of the tube.And the longtime overheating was caused by the decrease of steam flow resulting from oxides accumulation at the tube elbow.关键词
屏式过热器管/爆裂/老化/蠕变/长时过热Key words
platen superheater tube/burst/aging/creep/longtime overheating分类
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句光宇..300MW亚临界机组锅炉屏式过热器管爆裂原因分析[J].理化检验-物理分册,2016,52(12):888-891,896,5.
