Study on blowing process of oxide skin of steam pipeline in a 1000 MW unit

WANG Lin; WANG Hongyu; GAO Jinghui; ZHANG Yafu; CHENG Rui; MENG Yingqi

doi:10.19666/j.rlfd.201905087

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Study on blowing process of oxide skin of steam pipeline in a 1000 MW unit

更新时间：2025-09-28

- Study on blowing process of oxide skin of steam pipeline in a 1000 MW unit
- Thermal Power Generation Vol. 49, Issue 2, Pages: 93-98(2020)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 陕西能源赵石畔煤电有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201905087
  CLC： TG115;TK223.3+2
- Published Online：15 January 2020，
  
  Published：2020
- 稿件说明：
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WANG Lin, WANG Hongyu, GAO Jinghui, et al. Study on blowing process of oxide skin of steam pipeline in a 1000 MW unit[J]. Thermal power generation, 2020, 49(2): 93-98.
DOI：

WANG Lin, WANG Hongyu, GAO Jinghui, et al. Study on blowing process of oxide skin of steam pipeline in a 1000 MW unit[J]. Thermal power generation, 2020, 49(2): 93-98. DOI： 10.19666/j.rlfd.201905087.

摘要

为分析超超临界1 000 MW机组锅炉高温过热器管泄漏原因

对现场采集的管样进行了宏观形貌检查、理化性能试验、显微组织分析及材料硬度测试。结果表明

锅炉高温过热器管泄漏原因为管道内氧化皮剥落

堵塞管道

引起局部过热所致。对此

提出利用高低压旁路

进行常态化蒸汽吹扫

以实现锅炉蒸汽管道内氧化皮受控剥落、有序排出

保证机组后期的运行安全。氧化皮常态化吹扫方案实际应用效果良好

可为同类机组提供参考。

Abstract

In order to analyze the causes of leakage of high temperature superheater tubes in an ultra-supercritical 1 000 MW unit boiler

macro-morphology examination

physical and chemical properties test

microstructure analysis and material hardness test were carried out on the samples collected on site. The test results show that

the leak reason is that the oxide scales on the pipeline peel off

leading to blockage of the pipeline and local overheating. Thus

a preventive steam purging method using high and low pressure bypass is proposed to realize controlled peeling and orderly discharge of oxide scales on boiler steam pipes and ensure the safety of the later operation of the unit. The practical application effect of the oxide scale stripping and purging method is good

which can provide reference for similar units.

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ZHAO Mingzhong

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