Effect of Flexible Operation on Residual Life of High-Temperature Components of Power Plants
Abstract
:1. Introduction
2. Methodology
2.1. Thermo-Structural Analysis for Evaluation of Strain Range during Flexible Operation
2.2. Creep–Fatigue Damage Theory
2.3. Machine Learning Techniques
2.3.1. Feedforward Neural Network Model
2.3.2. Hyperparameter Optimization Using Random Search
3. Numerical Examples
3.1. Validation for Thermo-Structural FE Model
- (a)
- Radiant and convective heat transfer from combustion gas at the outer wall;
- (b)
- Conduction in the tube wall;
- (c)
- Convection at the inner wall of the working fluid.
3.2. Estimation of Fatigue Life under Cyclic Thermal Loads
3.3. Creep and Fatigue Life of the Header
3.4. Response Surface Model
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Elements | C | Mn | Si | Cr | Ni | N | Nb | P |
---|---|---|---|---|---|---|---|---|
Composition (wt%) | 0.07–0.13 | 1.00 | 0.010 | 17.0–19.0 | 7.5–10.5 | 0.05–0.12 | 0.30–0.60 | 0.040 |
Material Property | Value at 300 °C | Value at 500 °C | Value at 700 °C |
---|---|---|---|
Density, ρ ) | 7790 | 7700 | 7610 |
Thermal expansion coefficient, α | 9.7 | 10.05 | 10.3 |
Elastic modulus E | 164.78 | 148.93 | 132.38 |
Poisson’s ratio ν | 0.2874 | 0.2946 | 0.3018 |
Thermal conductivity, k | 21.461 | 24.923 | 30.98 |
Specific heat, c | 542.62 | 579.71 | 616.81 |
Boundary Condition | Under 100% Condition | Under 30% Condition | ||
---|---|---|---|---|
Tube | Inlet | 501.71 | 474.22 | |
Outlet | 502.29 | 475.32 | ||
Inlet | 1057.89 | 1066.17 | ||
Outlet | 843.19 | 857.56 | ||
Internal pressure p | Inlet | 25.303 | 9.787 | |
Outlet | 25.298 | 9.786 | ||
() | 8.582 | 8.216 | ||
5436.24 | 1620.95 | |||
Emissivity | 0.8 | |||
0.281 | ||||
Header | 596 | 572 | ||
Convective film coefficient, () | 2403.8 | 980.54 | ||
Internal pressure, p () | 4.599 | 1.483 |
Part | Num. of Nodes | Num. of Elements |
---|---|---|
Tube | 31,648 | 24,021 |
Header | 24,324 | 17,527 |
Value | At Header Component | At Tube Component |
---|---|---|
Maximum temperature over time (°C) | 595.52 ° | 527.70 ° |
Minimum temperature over time (°C) | 566.20 ° | 513.34 ° |
Maximum von Mises stress over time (MPa) | 228.09 | 113.61 |
Minimum von Mises stress over time (MPa) | 13.169 | 74.761 |
Maximum strain range |
Value | |||
---|---|---|---|
Max | 2 | 50 | 0.1 |
Min | 1 | 5 | 0.000001 |
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Heo, J.; Park, M.; Kim, J.-M.; Jang, D.-W.; Han, J.-H. Effect of Flexible Operation on Residual Life of High-Temperature Components of Power Plants. Processes 2023, 11, 1679. https://doi.org/10.3390/pr11061679
Heo J, Park M, Kim J-M, Jang D-W, Han J-H. Effect of Flexible Operation on Residual Life of High-Temperature Components of Power Plants. Processes. 2023; 11(6):1679. https://doi.org/10.3390/pr11061679
Chicago/Turabian StyleHeo, Jun, Mingyu Park, Jeong-Myun Kim, Dong-Won Jang, and Ji-Hoon Han. 2023. "Effect of Flexible Operation on Residual Life of High-Temperature Components of Power Plants" Processes 11, no. 6: 1679. https://doi.org/10.3390/pr11061679