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Storing electricity in the low-rank coal: The heat-upgrading carnot battery concept and a comprehensive thermodynamic analysis

Author

Listed:
  • Sun, Yang
  • Zhang, Xiang
  • Xu, Cheng
  • Li, Chao
  • Shao, Mingxuan
  • Wang, Dechang
  • Yang, Qirong
  • Sun, Hongchen

Abstract

Promoting the energy/exergy performance of Carnot batteries is beneficial for future applications. This work proposed a Carnot battery concept deeply integrated with the low-rank coal (LRC) power plant (LCPP) for (1) enhancing the energy/exergy performance and (2) reducing LCPP's carbon emission and the minimum technical output (to adopt excess renewable power). The enhancement is attributed to the heat-upgrading effect of LRC pre-drying process and the energy complementarity between the subunits. A thermodynamic model based on the typical LCPP and Carnot battery cases is established to assess and analyze the proposed system. As the results show: (1) Daily average round-trip/exergy efficiencies reach 70.92 % and 54.28 %, and 3.36 % of carbon emission (126.52 ton/day) is reduced in 24 h, significantly higher than the conventional HP-ORC Carnot battery integrated with LCPP. (2) The performance of the proposed Carnot battery cannot be directly predicted from the subunits' performance due to the discharge during the charging periods; however, as long as the integrated charging capacity is not too small, the energy/exergy performance can maintain an elevated level. (3) For a generalized HP-ORC Carnot battery, low exergy input of discharging cycle limits the performance improvement; however, in the proposed system, the energy-upgrading effect compensates for this shortcoming.

Suggested Citation

  • Sun, Yang & Zhang, Xiang & Xu, Cheng & Li, Chao & Shao, Mingxuan & Wang, Dechang & Yang, Qirong & Sun, Hongchen, 2024. "Storing electricity in the low-rank coal: The heat-upgrading carnot battery concept and a comprehensive thermodynamic analysis," Energy, Elsevier, vol. 312(C).
    • Handle: RePEc:eee:energy:v:312:y:2024:i:c:s0360544224033450
    DOI: 10.1016/j.energy.2024.133567
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