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An innovative waste-to-energy system integrated with a coal-fired power plant

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  • Chen, Heng
  • Zhang, Meiyan
  • Xue, Kai
  • Xu, Gang
  • Yang, Yongping
  • Wang, Zepeng
  • Liu, Wenyi
  • Liu, Tong

Abstract

An advanced waste-to-energy system integrated with a coal-fired power plant has been proposed to improve the energy utilization of municipal solid waste. In the new design, the energy gained from the waste-to-energy boiler is employed to heat the feedwater and partial cold reheat steam of the coal power plant, and the feedwater of the waste-to-energy boiler is provided by the heat regeneration system of the coal power plant. Consequently, the energy obtained from the waste incineration products is injected into the steam cycle of the coal power plant, and the waste-to-electricity efficiency can be significantly boosted. Based on a 500 t/day waste-to-energy plant and a 630 MW coal power plant, the proposed hybrid scheme was evaluated compared with the conventional separate one. The results show that the waste-to-electricity efficiency is promoted by 9.16% points with an additional net power output of 3.71 MW, attributed to the suggested integration. Furthermore, the energy-saving mechanism of the novel concept was revealed by energy and exergy analyses. Finally, the new design was economically examined, which indicates that the dynamic payback period of the proposed waste-to-energy plant is only 3.55 years, which is 5.87 years shorter than that of the conventional one.

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  • Chen, Heng & Zhang, Meiyan & Xue, Kai & Xu, Gang & Yang, Yongping & Wang, Zepeng & Liu, Wenyi & Liu, Tong, 2020. "An innovative waste-to-energy system integrated with a coal-fired power plant," Energy, Elsevier, vol. 194(C).
    • Handle: RePEc:eee:energy:v:194:y:2020:i:c:s0360544219325885
    DOI: 10.1016/j.energy.2019.116893
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