Thermal fatigue failure analysis for drainage-tank in hot section of reheat pipeline in an ultra supercritical 1 000 MW unit

LOU Yumin; PENG Yichao; TU Rongfeng; XU Haohao; WANG Xianming

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Thermal fatigue failure analysis for drainage-tank in hot section of reheat pipeline in an ultra supercritical 1 000 MW unit

Thermal Power Generation Issue 12, (2017)

更新时间：2025-09-28

- Thermal fatigue failure analysis for drainage-tank in hot section of reheat pipeline in an ultra supercritical 1 000 MW unit
- 作者机构：
  
  1. 浙江浙能技术研究院有限公司,浙江,杭州,310003
  2. 浙江浙能中煤舟山煤电有限责任公司,浙江,舟山,316131
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG115
- Published Online：04 January 2018，
  
  Published：2017
- 稿件说明：
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LOU Yumin, PENG Yichao, TU Rongfeng, et al. Thermal fatigue failure analysis for drainage-tank in hot section of reheat pipeline in an ultra supercritical 1 000 MW unit[J]. Thermal Power Generation, 2017, (12).
DOI：

LOU Yumin, PENG Yichao, TU Rongfeng, et al. Thermal fatigue failure analysis for drainage-tank in hot section of reheat pipeline in an ultra supercritical 1 000 MW unit[J]. Thermal Power Generation, 2017, (12). DOI：

摘要

超超临界机组再热热段疏水罐发生泄漏会对人身和设备安全构成极大威胁。为了研究造成疏水罐泄漏的因素，本文以发生泄漏的某1 000 MW机组热段疏水罐为研究对象，对其内壁缺陷位置进行了无损检测、成分检验、组织分析、力学性能试验等，并从疏水罐的疏水逻辑、疏水阀位置、水位测量管路布置等多个角度进行分析。结果表明：这种泄漏主要由冷凝水与内壁作用导致的热疲劳引起；疏水不尽、疏水阀位置远离疏水罐底部、蒸汽在水位测量管路遇冷液化是造成疏水罐中冷凝水形成的重要原因；疏水罐罐口的湍流侵入效应、机组负荷变化、水位计管口冷凝水回流等因素使得疏水罐底部冷凝水液位面上下波动，造成较大范围热疲劳裂纹。为避免再次发生泄漏，需要在疏水罐的疏水逻辑、疏水阀位置、水位测量管路等方面进行改进。

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