Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler

Kuang YU; Jiaan WANG; Taoying WANG; Chen CHEN

doi:10.12096/j.2096-4528.pgt.18149

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Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler

Power Generation and Environmental protection | 更新时间：2025-06-06

- Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler
- Power Generation Technology Vol. 40, Issue 2, Pages: 192-195(2019)
- 作者机构：
  
  华电电力科学研究院有限公司, 浙江省杭州市 310030
- 作者简介：
- 基金信息：
- DOI：10.12096/j.2096-4528.pgt.18149
  CLC：
- Received：14 August 2018，
  
  Published：30 April 2019
- 稿件说明：
移动端阅览
Kuang YU, Jiaan WANG, Taoying WANG, et al. Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler[J]. Power Generation Technology, 2019, 40(2): 192-195.
DOI：

Kuang YU, Jiaan WANG, Taoying WANG, et al. Cause Analysis of Burst Tube of Final-Stage Superheater Tube in a Power Station Boiler[J]. Power Generation Technology, 2019, 40(2): 192-195. DOI： 10.12096/j.2096-4528.pgt.18149.

摘要

在长期过热的运行工况下，锅炉高温过热器极易产生材料的劣化以及材料组织和性能的下降，最终引发爆管事故。通过宏观检查、布氏硬度测试、抗拉强度测试和金相组织检验对某电厂末级过热器爆管原因进行分析。结果表明，该末级过热器管由于在长期高温高压下超温运行，导致碳化物在晶界富集，晶界强度下降，在拉应力的作用下，晶界产生蠕变空洞及蠕变裂纹，使得珠光体耐热钢的持久强度和抗拉强度下降，最终产生断裂失效。

Abstract

In the long-term overheating operation condition

the boiler high temperature superheater is easy to cause the deterioration of materials and the decline of material structure and performance

and causes the pipe explosion accident. The causes of burst tube of final-stage superheater tube in a power plant boiler were analysed through macroscopic examination

Brinell hardness test

tensile strength test and metallographic structure test. The analysis results show that final-stage superheater tube operates at high temperature and pressure for a long time

resulting in the carbide enrichment at grain boundary and weaken the grain boundary strength. Under the action of tensile stress

creep cavities and creep cracks occur at grain boundary

resulting in the decrease of durable strength and tensile strength of pearlite heat-resistant steel

and finally the fracture failure occurs.

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references

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