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- Title
超超临界锅炉过热器管超温蠕变 应力松弛规律研究.
- Authors
林齐叠; 严祯荣; 王化南; 陈 乐; 卫荆涛
- Abstract
The superheater tube in the outlet area of the high-temperature superheater box of ultrasupercritical 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 10 000 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 10 000 h, the thickness of pipe wall begins to decrease. The results show that the overtemperature operation of superheater tube of ultra-supercritical boiler for 10 000 h is the time point from creep stress relaxation to creep damage.
- Publication
Journal of Shanghai University of Engineering Science / Shanghai Gongcheng Jishu Daxue Xuebao, 2021, Vol 35, Issue 4, p333
- ISSN
1009-444X
- Publication type
Article