New Hybrid CHP System Integrating Solar Energy and Exhaust Heat Thermochemical Synergistic Conversion with Dual-Source Energy Storage

  • QIN Yuanlong ,
  • LIU Taixiu ,
  • LI Peijing ,
  • ZHAO Kai ,
  • JIAO Fan ,
  • PEI Gang ,
  • LIU Qibin
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  • 1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
    4. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Online published: 2024-04-30

Supported by

This study is financially supported by the Distinguish Young Scholars of the National Natural Science Foundation of China (No. 52225601) and the National Natural Science Foundation of China (Grant No. 52006214).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

For the efficient use of solar and fuels and to improve the supply-demand matching performance in combined heat and power (CHP) systems, this paper proposes a hybrid solar/methanol energy system integrating solar/exhaust thermochemical and thermal energy storage. The proposed system includes parabolic trough solar collectors (PTSC), a thermochemical reactor, an internal combustion engine (ICE), and hybrid storage of thermal and chemical energy, which uses solar energy and methanol fuel as input and outputs power and heat. With methanol thermochemical decomposition reaction, mid-and-low temperature solar heat and exhaust heat are upgraded to chemical energy for efficient power generation. The thermal energy storage (TES) stores surplus thermal energy, acting as a backup source to produce heat without emitting CO2. Due to the energy storage, time-varying solar energy can be used steadily and efficiently; considerable supply-demand mismatches can be avoided, and the operational flexibility is improved. Under the design condition, the overall energy efficiency, exergy efficiency, and net solar-to-electric efficiency achieve 72.09%, 37.65%, and 24.63%, respectively. The fuel saving rate (FSR) and the CO2 emission reduction (ERCO2) achieve 32.97% and 25.33%, respectively. The research findings provide a promising approach for the efficient and flexible use of solar energy and fuels for combined heat and power.

Cite this article

QIN Yuanlong , LIU Taixiu , LI Peijing , ZHAO Kai , JIAO Fan , PEI Gang , LIU Qibin . New Hybrid CHP System Integrating Solar Energy and Exhaust Heat Thermochemical Synergistic Conversion with Dual-Source Energy Storage[J]. Journal of Thermal Science, 2024 , 33(3) : 970 -984 . DOI: 10.1007/s11630-024-1906-3

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