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Optimization Potentials for the Waste Heat Recovery of a Gas-Steam Combined Cycle Power Plant Based on Absorption Heat Pump

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Abstract

A new waste heat recovery system is presented to recover exhausted steam waste heat from the steam turbine by absorption heat pump (AHP) in a gas-steam combined cycle (GSCC) power plant. The system can decrease energy consumption and further improve the energy utilization. The performance evaluation criteria are calculated, and exergy analysis for key components are implemented in terms of the energy and exergy analysis theory. Besides, the change of these criteria is also revealed before and after modification. The net power output approximately increases by 21738 kW, and equivalent coal consumption decreases by 5.58 g/kWh. A 1.81% and 1.92% increase in the thermal and exergy efficiency is respectively obtained in the new integrated system as the heating load is 401095 kJ at 100% condition. Meanwhile, the appropriate extraction parameters for heating have been also analyzed in the two systems. The proposed scheme can not only save energy consumption but also reduce emission and gain great economic benefit, which is proven to be a huge potential for practical application.

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Acknowledgments

The research is supported by National Natural Science Foundation of China No. 51274224, and the China Scholarship Council (CSC) (No. 201706440092).

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Authors and Affiliations

  1. College of Machinery and Transportation Engineering, China University of Petroleum, Beijing, 102249, China

    Hongsheng Zhang, Hongbin Zhao & Zhenlin Li

  2. School of Mechanical Engineering, the University of Adelaide, Adelaide, SA, 5005, Australia

    Hongsheng Zhang & Eric Hu

  3. Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, 102249, China

    Hongsheng Zhang, Hongbin Zhao & Zhenlin Li

Authors
  1. Hongsheng Zhang
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  2. Hongbin Zhao
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  3. Zhenlin Li
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  4. Eric Hu
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Correspondence to Hongbin Zhao.

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Zhang, H., Zhao, H., Li, Z. et al. Optimization Potentials for the Waste Heat Recovery of a Gas-Steam Combined Cycle Power Plant Based on Absorption Heat Pump. J. Therm. Sci. 28, 283–293 (2019). https://doi.org/10.1007/s11630-018-1055-7

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  • DOI: https://doi.org/10.1007/s11630-018-1055-7

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