Creep-Fatigue Damage Assessment of a Superheater Header Based on Different Evaluation Codes

ZHANG Hao; XIA Xianxi; ZHANG Tianyu; TIAN Genqi; WANG Xiaowei; GONG Jianming

doi:10.19805/j.cnki.jcspe.2025.230713

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Creep-Fatigue Damage Assessment of a Superheater Header Based on Different Evaluation Codes

更新时间：2026-01-21

- Creep-Fatigue Damage Assessment of a Superheater Header Based on Different Evaluation Codes
- Chinese Journal of Power Engineering Vol. 45, Issue 2, Pages: 205-213(2025)
- 作者机构：
  
  1. 南京工业大学机械与动力工程学院,江苏,南京,211816
  2. 南京工业大学高端装备可靠性制造研究院,江苏,南京,211816
  3. 苏州热工研究院有限公司,江苏,苏州,215004
  4. 上海发电设备成套设计研究院有限责任公司,上海,200240
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.230713
  CLC： TM621
- Published Online：15 February 2025，
  
  Published：2025
- 稿件说明：
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张浩,夏咸喜,张天宇,田根起,王小威,巩建鸣. 基于不同评估规范的过热器联箱蠕变-疲劳损伤分析动力工程学报, 2025, 45(2): 205-213 https://doi.

org/10.19805/j.cnki.jcspe.2025.230713
张浩,夏咸喜,张天宇,田根起,王小威,巩建鸣. 基于不同评估规范的过热器联箱蠕变-疲劳损伤分析动力工程学报, 2025, 45(2): 205-213 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.230713.

org/10.19805/j.cnki.jcspe.2025.230713 DOI：

摘要

超临界机组过热器出口联箱长期在高温、高压的恶劣工况下工作

高温环境下频繁启停及长时间稳态运行导致联箱承受典型的蠕变-疲劳损伤。为确保超临界机组的长周期稳定运行

应选取合适的损伤评估方法对机组损伤状态进行评价。以某发电厂超临界机组过热器联箱为分析对象

基于有限元软件Abaqus获取机组运行期间联箱应力的分布情况

分别采用ASME-Ⅲ标准、RCC-MRx标准、R5规程进行损伤评价。结果表明:ASME-Ⅲ标准评估的许用时间与检修年限相当;RCC-MRx标准评价结果偏大

过于保守;R5规范评价结果非保守

明显小于前两者;因此

对于此类设备可优先选用ASME-Ⅲ规范作为损伤评估准则

在ASME-Ⅲ标准评估结果趋于保守时

可采用R5规范作为替代方案。

Abstract

Supercritical unit superheater outlet headers operate under chronic high-temperature and high-pressure conditions

the frequent start-stops and long-time steady-state operations under high temperature lead to typical creep-fatigue damages in the header. An appropriate method should thus be selected to evaluate the damage state of the unit to ensure long-term steady operation of supercritical units. A numerical simulation based on finite element software Abaqus was carried out on the superheater header of a supercritical power generation unit. During the operation of the unit

the distribution of stress on the header was obtained

and the damage was evaluated with three different codes: ASME-III

RCC-MRx and R5

respectively. Results show good agreement in the allowable time evaluated by the ASME-III code with the maintenance life

conservative and overpredicted damage by the RCC-MRx code

and underpredicted damage by the R5 code with significantly less damage than the other codes. Therefore

the ASME-III code should be selected first as the criteria of the damage evaluation for this type of equipment

and the R5 code can be used as an alternative when the ASME-III code gives conservative results.

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references

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