Combustion and reaction

Numerical Investigation on the Heat Transfer Characteristics of Supercritical Water in a Non-Uniformly Heated Tube for a Supercritical CFB Boiler

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  • State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Online published: 2023-10-23

Supported by

This work is financially supported by the National Key Research & Development Program of China (2022YFB4100303).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Abstract

In this paper, a numerical model was built by ANSYS FLUENT to investigate the heat transfer performances of supercritical water in a circumferential non-uniformly heated vertical tube. The Shear Stress Transport (SST) k-ω model was adopted for describing turbulence. The operating parameters are chosen according to a 660 MW ultra-supercritical CFB boiler. The heat transfer performances under different operating parameters, such as boiler load, flow direction and heat flux distribution are analyzed. The temperature and heat flux on inner wall varies along the circumference and show symmetric distributions. The overall heat transfer performances at each cross section are better than the local heat transfer performance of midpoint of heating side. Flow direction has a great influence on heat transfer performance; it changes the radial distribution of axial velocity and then affects the turbulence distribution. Therefore, upward flow condition shows a better heat transfer performance. Smaller heat flux improves both the overall and local heat transfer performances. Reducing the heat flux area is not conducive to the overall heat transfer, but does not affect the local heat transfer at the midpoint of heating side. Finally, a new correlation is fitted based on the simulated results of supercritical water heat transfer with circumferential non-uniform heat flux distributions.

Cite this article

DU Xiaocheng, SONG Yuanyuan, XIANG Yuxuan, ZHOU Yanjun, WANG Aoyu, YANG Dong . Numerical Investigation on the Heat Transfer Characteristics of Supercritical Water in a Non-Uniformly Heated Tube for a Supercritical CFB Boiler[J]. Journal of Thermal Science, 2023 , 32(5) : 1807 -1818 . DOI: 10.1007/s11630-023-1852-5

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