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Performance of a solar aided power plant in fuel saving mode

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  • Hou, Hongjuan
  • Wu, Junjie
  • Yang, Yongping
  • Hu, Eric
  • Chen, Si

Abstract

Integrating solar energy into conventional fossil-fuel fired power plant has been proven to be an efficient way to use solar energy for power generation purpose. In a solar-aided power generation (SAPG) system without storage system, owing to the instability of solar radiation, the turbine and the boiler work under off-design conditions most of time. In this paper, a modified simulation model is established to analyze the off-design performance of SAPG system. In order to speed up the calculations of the model, improved Matrix Thermal Balance Equation (MTBE) approach is used. A solar-aided feedwater heating of a 330MW coal-fired power generation unit in fuel-saving operation mode is discussed as a case study. The results show that, in a SAPG system, when HP extraction steam is partly replaced, with the increasing solar energy being introduced, the temperature of exhaust flue gas decreases; boiler efficiency improves and standard coal consumption rate decreases. With more solar heat introduced the temperature of superheated and reheated steam keep constant at first and then decrease rapidly. However, in real project, the temperature drop should be no more the permissible limits, which should be considered. The results obtained in the current study could provide a promising approach to find the balance between coal saving and safe operation of the SAPG system.

Suggested Citation

  • Hou, Hongjuan & Wu, Junjie & Yang, Yongping & Hu, Eric & Chen, Si, 2015. "Performance of a solar aided power plant in fuel saving mode," Applied Energy, Elsevier, vol. 160(C), pages 873-881.
    • Handle: RePEc:eee:appene:v:160:y:2015:i:c:p:873-881
    DOI: 10.1016/j.apenergy.2015.01.092
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    13. Wu, Junjie & Hou, Hongjuan & Yang, Yongping & Hu, Eric, 2015. "Annual performance of a solar aided coal-fired power generation system (SACPG) with various solar field areas and thermal energy storage capacity," Applied Energy, Elsevier, vol. 157(C), pages 123-133.
    14. Huang, Chang & Hou, Hongjuan & Hu, Eric & Yu, Gang & Peng, Hao & Yang, Yongping & Wang, Lu & Zhao, Jin, 2019. "Performance maximization of a solar aided power generation (SAPG) plant with a direct air-cooled condenser in power-boosting mode," Energy, Elsevier, vol. 175(C), pages 891-899.
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    17. Zhang, Maolong & Xu, Chao & Du, Xiaoze & Amjad, Muhammad & Wen, Dongsheng, 2017. "Off-design performance of concentrated solar heat and coal double-source boiler power generation with thermocline energy storage," Applied Energy, Elsevier, vol. 189(C), pages 697-710.
    18. Jun Zhao & Kun Yang, 2020. "Allocating Output Electricity in a Solar-Aided Coal-Fired Power Generation System and Assessing Its CO 2 Emission Reductions in China," Sustainability, MDPI, vol. 12(2), pages 1-15, January.
    19. Huang, Chang & Hou, Hongjuan & Hu, Eric & Yu, Gang & Peng, Hao & Zhao, Jin & Yang, Yongping, 2019. "Stabilizing operation of a solar aided power generation (SAPG) plant by adjusting the burners’ tilt and attemperation flows in the boiler," Energy, Elsevier, vol. 173(C), pages 1208-1220.
    20. Wang, Jianxing & Duan, Liqiang & Yang, Yongping & Yang, Zhiping & Yang, Laishun, 2019. "Study on the general system integration optimization method of the solar aided coal-fired power generation system," Energy, Elsevier, vol. 169(C), pages 660-673.
    21. Li, Chao & Zhai, Rongrong, 2024. "A novel solar tower assisted pulverized coal power system considering solar energy cascade utilization: Performance analysis and multi-objective optimization," Renewable Energy, Elsevier, vol. 222(C).
    22. Huang, Chang & Hou, Hongjuan & Hu, Eric & Yu, Gang & Chen, Si & Yang, Yongping, 2020. "Measures to reduce solar energy dumped in a solar aided power generation plant," Applied Energy, Elsevier, vol. 258(C).
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    24. Al-Sulaiman, F.A., 2016. "On the auxiliary boiler sizing assessment for solar driven supercritical CO2 double recompression Brayton cycles," Applied Energy, Elsevier, vol. 183(C), pages 408-418.
    25. Liu, Ming & Wang, Shan & Yan, Junjie, 2021. "Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm," Energy, Elsevier, vol. 214(C).

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