| Autor: |
Xu, Jiaye, Fan, Haojie, Wu, Xiaojiang, Zhang, Jian, Ye, Nina, Zhang, Qichao, Zhang, Zhongxiao |
| Zdroj: |
Journal of Thermal Science; Nov2024, Vol. 33 Issue 6, p2372-2385, 14p |
| Abstrakt: |
Ultra-supercritical double-reheat boilers employ multiple temperature-regulating methods during flexible peak shaving. This exposes the boiler to significant tube-wall temperature deviations and overtemperatures. In this study, a compartment model was developed to subdivide the overlapping high-temperature heating surfaces of a 660-MW double-reheat boiler into smaller compartments. The model was verified using field experimental data and was applied to calculate the enthalpy and tube-wall temperature distributions under different loads. In addition, the effects of three temperature-regulating methods (swinging burners, regulating dampers, and flue gas recirculation) on the variation tendency and deviations of the tube-wall temperature were analysed. The results indicated that overtemperatures occurred in the high-temperature superheater under a low load. The regulating damper method caused the high-temperature secondary reheater to exceed the permissible temperature by 21.4°C. The tube-wall temperature exhibited a bimodal distribution along the width. At 0% flue gas recirculation, the maximum tube-wall temperature deviation attained 13.39°C, exceeding a reasonable value by 3.39°C. The swinging burner method was the least likely to cause tube-wall temperature deviations and overtemperatures. The reasonable regulation ranges for swinging burners, regulating dampers, and flue gas recirculation were −20° to 7°, 45% to 60%, and 8% to 24%, respectively. Based on different flexible peak shaving constraints, an appropriate temperature-regulating method was selected, and the regulation range was specified. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink