Study on relaxation rule of over temperature creep stress in superheater tube of ultra-supercritical boiler

LIN Qidie; YAN Zhenrong; WANG Huanan; CHEN Le; WEI Jingtao

Volume 35 Issue 4

Feb. 2022

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Article Navigation > Journal of Shanghai University of Engineering Science > 2021 > 35(4): 333-339

LIN Qidie, YAN Zhenrong, WANG Huanan, CHEN Le, WEI Jingtao. Study on relaxation rule of over temperature creep stress in superheater tube of ultra-supercritical boiler[J]. Journal of Shanghai University of Engineering Science, 2021, 35(4): 333-339.

Citation:

LIN Qidie, YAN Zhenrong, WANG Huanan, CHEN Le, WEI Jingtao. Study on relaxation rule of over temperature creep stress in superheater tube of ultra-supercritical boiler[J]. Journal of Shanghai University of Engineering Science, 2021, 35(4): 333-339.

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Study on relaxation rule of over temperature creep stress in superheater tube of ultra-supercritical boiler

1.
School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2.
Shanghai Institute of Supervision & Inspection Techniques for Special Equipment, Shanghai 200062, China

Received Date: 2021-09-07
Publish Date: 2022-02-23

Abstract

Abstract

The superheater tube in the outlet area of the high-temperature superheater box of ultra-supercritical boiler is easy to be exposed to overtemperature environment, resulting in creep stress relaxation and material failure. Based on Norton creep model, the stress relaxation behavior and creep distribution of T91 superheater tube wall during long-term thermal induction were simulated under the operating conditions of flue gas temperature of 750℃, steam temperature of 600℃ and steam pressure of 26 MPa. The simulation results show that stress relaxation phenomenon of the heat pipe firstly occurs on the inner wall and spreads along the radial direction with time accumulation. After 10000 h, the inner wall surface appears stress relaxation and relaxation accelerates. At the same time, high temperature creep behavior also occurs on the tube wall during the stress relaxation process, and the creep behavior firstly appears on the inner wall and spreads along the radial direction, and the creep degree of the inner wall is higher than that of the outer wall. After 10000 h, the thickness of pipe wall begins to decrease. The results show that the overtemperature operation of superheater tube of ultra-supercritical boiler for 10000 h is the time point from creep stress relaxation to creep damage.
- ultra-supercritical boiler,
- superheater tube,
- creep,
- stress relaxation,
- time point

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References(20)

References

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