Experimental Study of Deformation Risk and Interpolation Analysis of Temperature for Water Walls under Flexible Low-Load Conditions
Publication: Journal of Energy Engineering
Volume 149, Issue 5
Abstract
With the development of renewable energy in power generation, a large number of thermal power plants operate under flexible working conditions. To study water wall deformation risk under flexible low-load conditions, a lab-scale opposed firing boiler was built to measure and analyze the temperature and thermal stress of the water wall under low-load flexible operating conditions with several nontypical burner arrangements. The results showed that flame radiation and flue gas convection heat transfer induced a high-temperature zone. Thermal stress was mainly caused by thermal expansion of the metal and expansion or extrusion deformation of other areas. Also, local thermal stress fluctuations and excessive values appeared under variable conditions. In addition, the burners’ symmetrical arrangement in the center effectively reduced thermal stress fluctuations and overall thermal stress under flexible working conditions. Finally, based on the limited temperature measurement points in this experiment, the optimal power parameter for the inverse distance weighted (IDW) method and the shape parameter for the radial basis function (RBF) method were found to make a reasonable interpolation prediction of the temperature distribution of the water wall. This study highlights the recommended burner arrangements under flexible low-load conditions and the optimal parameters of the IDW and the RBF methods for estimating temperature in guiding safe operation of the water wall.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is supported by the National Key Research and Development Program of China (No. 2021YFC3001803).
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 149 • Issue 5 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 8, 2023
Accepted: Apr 12, 2023
Published online: Jun 19, 2023
Published in print: Oct 1, 2023
Discussion open until: Nov 19, 2023
ASCE Technical Topics:
- Continuum mechanics
- Deformation (mechanics)
- Disaster risk management
- Energy engineering
- Energy sources (by type)
- Engineering fundamentals
- Engineering mechanics
- Hydro power
- Measurement (by type)
- Renewable energy
- Risk management
- Solid mechanics
- Stress (by type)
- Structural analysis
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Temperature effects
- Temperature measurement
- Thermal loads
- Thermal properties
- Thermodynamics
- Walls
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