东北电力技术2026，Vol.47Issue(1)：54-57,62,5.
低温过热器泄漏原因分析及预防措施
Cause Analysis and Preventive Measures of Low-Temperature Superheater Leakage
周杰1
作者信息
- 1. 华能嘉祥发电有限公司,山东 济宁 272400
- 折叠
摘要
Abstract
The frequent low-load operation of coal-fired power plants due to their participation in peak shaving lead to low flue gas tem-peratures at the inlet of SCR systems,to address this issue,adding an economizer flue gas bypass is a commonly adopted technical so-lution.After the bypass flue is put into operation,the inlet pipe of the low-temperature superheater is repeatedly scratched and cracked.Firstly,for Unit 1 boiler in some power plant,a bypass flue is created by making openings on the fins of tube panels below the inlet header of the low-temperature superheater,diverting high-temperature flue gas to the SCR system inlet.Secondly,through a comprehensive analysis of the causes of crack formation,it concludes that restricted expansion and alternating stress concentration are the main reasons for crack generation.Fianlly,it proposes preventive measures,a non-metallic expansion joint is implemented to effectively separate the economizer bypass flue from the rear wall of the rear flue.This flexible connection allows independent thermal expansion of both components without mutual interference,thereby eliminating safety risks in the boiler's"four tubes".It can provide a reference for low-temperature superheaters with similar problems.关键词
烟气旁路/低温过热器/疲劳裂纹/柔性连接/泄漏Key words
flue gas bypass/low-temperature superheater/fatigue crack/flexible connection/leak分类
信息技术与安全科学引用本文复制引用
周杰..低温过热器泄漏原因分析及预防措施[J].东北电力技术,2026,47(1):54-57,62,5.
