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Techno-economic evaluation of the novel hot air recirculation process for exhaust heat recovery from a 600 MW hard-coal-fired boiler

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  • Ma, Youfu
  • Wang, Ziwen
  • Lyu, Junfu
  • Wang, Zirui

Abstract

To increase the efficiency of thermal power plants, we have recently proposed and analyzed a novel exhaust heat recovery process called hot air recirculation (HAR), applied to a brown-coal-fired power unit as a test case. However, the performance of HAR, applied to a hard coal-fired power unit, is not clearly understood yet. In this study, the HAR process was redesigned to match the actual supply air and flue gas layout of a hard-coal-fired boiler. The thermo- and techno-economic performances of HAR, as well as the conventional bypass flue (CBF) process, applied to a 600 MW hard-coal-fired power unit, were analyzed in detail. The results indicate that, when the boiler exhaust heat is recovered from 122 to 90 °C, the net coal savings, initial capital cost, and payoff period of HAR are 3.49 g/(kW·h), $1.473 million, and 1.34 years, respectively, whereas those of CBF are 2.98 g/(kW·h), $2.528 million, and 3.04 years, respectively. Therefore, it is established that HAR can benefit a hard-coal-fired power plant with a greater saving on coal consumption and a more economical project investment, in addition to providing a safe and reliable operation, as compared to similar processes.

Suggested Citation

  • Ma, Youfu & Wang, Ziwen & Lyu, Junfu & Wang, Zirui, 2020. "Techno-economic evaluation of the novel hot air recirculation process for exhaust heat recovery from a 600 MW hard-coal-fired boiler," Energy, Elsevier, vol. 200(C).
    • Handle: RePEc:eee:energy:v:200:y:2020:i:c:s0360544220306654
    DOI: 10.1016/j.energy.2020.117558
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    References listed on IDEAS

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    1. Zhang, Wei & Wang, Suilin & Mu, Lianbo & Jamshidnia, Hamid & Zhao, Xudong, 2022. "Investigation of the forced-convection heat-transfer in the boiler flue-gas heat recovery units employing the real-time measured database," Energy, Elsevier, vol. 238(PA).

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