Anti-fatigue Design Method for Thick-walled Components of Utility Boilers Based on Material Nonlinear Damage Evolution

WANG Yuanliang; HAN Zhaowei; PAN Peiyuan; ZHU Zhongliang; NI Yongzhong; XU Hong

doi:10.19805/j.cnki.jcspe.2026.250039

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Anti-fatigue Design Method for Thick-walled Components of Utility Boilers Based on Material Nonlinear Damage Evolution

更新时间：2026-10-10

- Anti-fatigue Design Method for Thick-walled Components of Utility Boilers Based on Material Nonlinear Damage Evolution
- Chinese Journal of Power Engineering Vol. 46, Issue 5, Pages: 74-81(2026)
- 作者机构：
- 作者简介：
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- DOI：10.19805/j.cnki.jcspe.2026.250039
  CLC： TK225
- Published：2026
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王元良, 韩兆威, 潘佩媛, 朱忠亮, 倪永中, 徐鸿. 基于材料非线性损伤演化的电站锅炉厚壁部件抗疲劳设计方法[J]. 动力工程学报, 2026, 46(5): 74-81.
王元良, 韩兆威, 潘佩媛, 朱忠亮, 倪永中, 徐鸿. 基于材料非线性损伤演化的电站锅炉厚壁部件抗疲劳设计方法[J]. 动力工程学报, 2026, 46(5): 74-81. DOI： 10.19805/j.cnki.jcspe.2026.250039.

DOI： 10.19805/j.cnki.jcspe.2026.250039

摘要

针对电站锅炉厚壁部件在灵活性运行条件下的热机械疲劳损伤和寿命管理问题

提出了一种非线性损伤累积的疲劳寿命计算方法

同时给出了相应的抗疲劳设计及其逆向应用方法。开展了锅炉联箱三通结构的疲劳强度校核和700 ℃等级电站锅炉热态启动方案的设计与优化。结果表明:所建立的双曲正弦函数形式的损伤演化模型能够较好地描述Inconel 617合金在不同应变幅下的低周疲劳损伤演化行为;在机组"两班制"的运行方式下

联箱三通结构在热态启动过程中的最大弹塑性等效应变幅不超过0.17%才能满足30 a的服役寿命要求;当锅炉热态启动时间缩短至45 min时

基于Neuber法和G-M法

由弹性解计算出的联箱三通结构服役寿命分别为38和50 a。

Abstract

To address the issues of thermo-mechanical fatigue damage and life management for thick-walled components of utility boilers under flexible operating conditions

a fatigue life calculation method based on nonlinear damage accumulation was proposed

and corresponding anti-fatigue design and its inverse application methods were presented. Fatigue strength verification was conducted for the boiler header tee structure

and the design and optimization of hot start-up scheme for a 700 ℃ class utility boiler were carried out. Results show that the established damage evolution model in the form of a hyperbolic sine function can effectively describe the low-cycle fatigue damage evolution behavior of Inconel 617 alloy under different strain amplitudes. Under the "two-shift" operating mode

the maximum elastic-plastic equivalent strain amplitude of the header tee structure during the hot start-up should not exceed 0.17% to meet 30 a service life requirement. When the hot start-up time of the boiler is reduced to 45 min

the service lives of the header tee structure calculated by Neuber's method and the G-M method

are 38 and 50 a

respectively.

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references

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