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Thermodynamic performance study on solar-assisted absorption heat pump cogeneration system in the coal-fired power plant

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  • Zhang, Hongsheng
  • Zhao, Hongbin
  • Li, Zhenlin

Abstract

A new cogeneration system which integrates a solar-assisted absorption heat pump (SAAHP) into a coal-fired power plant for waste heat recovery of exhausted steam from a steam turbine is presented to improve utilization efficiency of fossil fuels. This study compares the performances of three cogeneration systems which differ in their driving heat source of AHP in the heating system. The following cogeneration systems are considered: conventional cogeneration system (CCS), cogeneration system with AHP driven by extracted steam (CSAES) and cogeneration system with AHP driven by solar (CSAS). Compared with the CCS and CSAES, output power respectively increases by about 11.43 and 6.48 MW; coal consumption rate reduces by 26.27 and 14.29 g/kWh in the CSAS with 11529 kJ heating capacity at 100% THA (Turbine heat acceptance) condition. The integral thermal and exergy efficiency of the CSAS are 58.32% and 36.26%. Meanwhile, reduced coal consumption rate and increased power both increase with increasing heating capacity. It is found that thermal efficiency and exergy efficiency for solar energy utilization both increase with the increasing load.

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  • Zhang, Hongsheng & Zhao, Hongbin & Li, Zhenlin, 2016. "Thermodynamic performance study on solar-assisted absorption heat pump cogeneration system in the coal-fired power plant," Energy, Elsevier, vol. 116(P1), pages 942-955.
    • Handle: RePEc:eee:energy:v:116:y:2016:i:p1:p:942-955
    DOI: 10.1016/j.energy.2016.09.125
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    3. Zhang, Hongsheng & Liu, Xingang & Liu, Yifeng & Duan, Chenghong & Dou, Zhan & Qin, Jiyun, 2021. "Energy and exergy analyses of a novel cogeneration system coupled with absorption heat pump and organic Rankine cycle based on a direct air cooling coal-fired power plant," Energy, Elsevier, vol. 229(C).
    4. Yang, Bo & Jiang, Yi & Fu, Lin & Zhang, Shigang, 2018. "Modular simulation of cogeneration system based on absorption heat exchange (Co-ah)," Energy, Elsevier, vol. 153(C), pages 369-386.
    5. Zhihua Ge & Fuxiang Zhang & Shimeng Sun & Jie He & Xiaoze Du, 2018. "Energy Analysis of Cascade Heating with High Back-Pressure Large-Scale Steam Turbine," Energies, MDPI, vol. 11(1), pages 1-15, January.
    6. Wu, Wei & Zhai, Chong & Huang, Si-Min & Sui, Yunren & Sui, Zengguang & Ding, Zhixiong, 2022. "A hybrid H2O/IL absorption and CO2 compression air-source heat pump for ultra-low ambient temperatures," Energy, Elsevier, vol. 239(PB).

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