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Exergy-based analysis combined with LCA for waste heat recovery in coal-fired CHP plants

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  • Zhang, Qi
  • Gao, Jintong
  • Wang, Yujie
  • Wang, Lin
  • Yu, Zaihai
  • Song, Dayong

Abstract

Coal-fired power generation brings about severe environmental impacts, such as air emissions, water pollution, and solid wastes. An exergy-based (exergetic, exergoeconomic, and exergoenvironmental) study of a coal-fired CHP system with waste heat recovery has been conducted. Firstly, waste heat profile is plotted with the extracted data to evaluate the recovery potential and feasibility. Models of rolling-cylinder ash cooler (RAC) and absorption heat pump (AHP) are developed and integrated in the CHP system. Then, an analysis method that combines thermodynamic with economic analysis and life cycle assessment is proposed for thermal-economic-environmental considerations. Finally, the method is applied in three cases, named base case (without heat recovery), R1 case (applying RAC and AHP), and R2 case (applying RAC, AHP, and a new steam turbine). The results show that the overall efficiency increases from 32.94% (base) to 34.14% (R1) and 34.89% (R2). Solid waste and global warming are dominant impacts caused by coal burning. The unit cost and environmental impact of hot water have a sharp decrease (28.3% and 29.1%, respectively) in R2 case, which shows a better economic and environmental performance.

Suggested Citation

  • Zhang, Qi & Gao, Jintong & Wang, Yujie & Wang, Lin & Yu, Zaihai & Song, Dayong, 2019. "Exergy-based analysis combined with LCA for waste heat recovery in coal-fired CHP plants," Energy, Elsevier, vol. 169(C), pages 247-262.
    • Handle: RePEc:eee:energy:v:169:y:2019:i:c:p:247-262
    DOI: 10.1016/j.energy.2018.12.017
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    3. Hu, Zhengbiao & He, Dongfeng & Zhao, Hongbo, 2023. "Multi-objective optimization of energy distribution in steel enterprises considering both exergy efficiency and energy cost," Energy, Elsevier, vol. 263(PB).
    4. Llera, Rocio & Vigil, Miguel & Díaz-Díaz, Sara & Martínez Huerta, Gemma Marta, 2022. "Prospective environmental and techno-economic assessment of steam production by means of heat pipes in the steel industry," Energy, Elsevier, vol. 239(PD).
    5. Martin N. Nwodo & Chimay J. Anumba, 2020. "Exergetic Life Cycle Assessment: A Review," Energies, MDPI, vol. 13(11), pages 1-19, May.
    6. Ren, Siyue & Feng, Xiao & Wang, Yufei, 2021. "Emergy evaluation of the integrated gasification combined cycle power generation systems with a carbon capture system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 147(C).

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