Optimization research on cooler heat recovery in S-CO2 coal-fired power generation system

被引：0
|
作者：
Guo Y. [1 ,2 ]
Sun E. [1 ,2 ]
Xu J. [2 ]
Wang Z. [1 ,2 ]
Liu G. [2 ]
机构：
[1] Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology, North China Electric Power University, Baoding
[2] Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2024年 / 54卷 / 02期
关键词：
cooler flow reduction; cooler heat recovery; cycle split method; double channel; S-CO[!sub]2[!/sub] cycle coal fired power generation system;
D O I：
10.1360/SST-2022-0269
中图分类号：
学科分类号：
摘要：
The cooling process of the S-CO2 cycle is heat released with variable temperatures. Thus, the cooler heat recovery method with air as a heat transfer medium can effectively improve the thermal efficiency of the system. When the cooler heat recovery is applied to SCO2 coal-fired power generation, the residual heat absorption in the tail flue is a crucial problem. To solve this problem, based on the recompression cycle with reheating and intercooling, the dual-channel tail flue and cooler heat recovery method are applied, which enables the air in air preheat to absorb the flue gas heat in a wider temperature zone, and the residual flue heat absorption of the boiler is improved. When the main vapor parameters of the S-CO2 cycle are 620°C and 30 MPa, compared to a single channel in the tail flue and heat recovery method, the thermal efficiency can be improved from 51.95% (RC+RH+IC+CHR) to 52.36% (RC+RH+IC +DCHR). To further optimize the coupling relationship between the cooler heat recovery and the residual flue gas absorption, the original cooler flow reduction method (CFR) is proposed herein, and the split method is introduced to prove the effectiveness of the CFR. The results show that the regenerative degree of the system is improved, and the ratio of a cycle with 100% efficiency is increased by the CFR. Finally, the cycle thermal efficiency is increased from 51.95% (RC+RH+IC+CHR) to 52.52% (RC+RH+IC +DCHR+CFR). © 2024 Chinese Academy of Sciences. All rights reserved.
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页码：225 / 235
页数：10
相关论文
共 22 条
  • [1] China Energy Statistics Yearbook, (2015)
  • [2] Xu J, Liu C, Sun E, Et al., Perspective of S-CO<sub>2</sub> power cycles, Energy, 186, (2019)
  • [3] Yang D L, Tang G H, Li X L, Et al., Capacity-dependent configurations of S-CO<sub>2</sub> coal-fired boiler by overall analysis with a unified model, Energy, 245, (2022)
  • [4] Wu P, Ma Y, Gao C, Et al., A review of research and development of supercritical carbon dioxide Brayton cycle technology in nuclear engineering applications, Nucl Eng Des, 368, (2020)
  • [5] Yang J, Yang Z, Duan Y., A review on integrated design and off-design operation of solar power tower system with S-CO<sub>2</sub> Brayton cycle, Energy, 246, (2022)
  • [6] Ahn Y, Bae S J, Kim M, Et al., Review of supercritical CO<sub>2</sub> power cycle technology and current status of research and development, Nucl Eng Tech, 47, pp. 647-661, (2015)
  • [7] Sun E H, Zheng Y W, Wang G, Et al., Thermodynamics analysis of S-CO<sub>2</sub> recompression-reheating cycle for coal fired power plant, Chin Sci Bull, 64, pp. 234-244, (2019)
  • [8] Yang H Y, Yang X Y, Zhang D X, Et al., Key technology research of evolutionary sodium-cooled fast reactor coupled with supercritical CO<sub>2</sub> power conversion system (in Chinese), Sci Sin Tech, 51, pp. 324-340, (2021)
  • [9] Osorio J D, Hovsapian R, Ordonez J C., Dynamic analysis of concentrated solar supercritical CO<sub>2</sub>-based power generation closed-loop cycle, Appl Thermal Eng, 93, pp. 920-934, (2016)
  • [10] Romeo L M, Bolea I, Lara Y, Et al., Optimization of intercooling compression in CO<sub>2</sub> capture systems, Appl Thermal Eng, 29, pp. 1744-1751, (2009)
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