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

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  • Ma, Youfu
  • Wang, Zirui
  • Lu, Junfu
  • Yang, Lijuan

Abstract

There had been several processes for recovering exhaust gas heat at the boiler cold-end, thereby increasing the efficiency of a thermal power plant. However, the existing processes encounter a great challenge on the heat exchanger, wherein the acid corrosion, fouling and abrasion of heating surfaces are inevitable because it is working in very low temperature flue gas. In this paper, a novel hot air recirculation (HAR) process is advanced to avoid these tricky problems. To demonstrate the thermo- and techno-economic performance of the HAR, an in-service 600 MW brown-coal-fired power unit was used as a reference unit for analyses. Meanwhile, the performance of the conventional bypass flue (CBF) process was also calculated for comparison. The results show that, when recovering the boiler exhaust heat from 148 °C to 90 °C, the net coal savings, initial capital cost and payoff period of the HAR are 7.31 g/(kW·h), 2.522 million USD and 1.08 years, whereas the corresponding results of the CBF are 6.79 g/(kW·h), 6.074 million USD and 3.24 years. Overall, the HAR can benefit the power plant from a safe and reliable operation, a greater net coal savings and a better techno-economic performance, exhibiting an obvious superiority in the similar processes.

Suggested Citation

  • Ma, Youfu & Wang, Zirui & Lu, Junfu & Yang, Lijuan, 2018. "Techno-economic analysis of a novel hot air recirculation process for exhaust heat recovery from a 600 MW brown-coal-fired boiler," Energy, Elsevier, vol. 152(C), pages 348-357.
    • Handle: RePEc:eee:energy:v:152:y:2018:i:c:p:348-357
    DOI: 10.1016/j.energy.2018.03.176
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    References listed on IDEAS

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    1. Stevanovic, Vladimir D. & Petrovic, Milan M. & Wala, Tadeusz & Milivojevic, Sanja & Ilic, Milica & Muszynski, Slawomir, 2019. "Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation," Energy, Elsevier, vol. 187(C).
    2. Chen, Wei & Shi, Wenxing & Li, Xianting & Wang, Baolong & Cao, Yang, 2020. "Application of optimization method based on discretized thermal energy in condensing heat recovery system of combined heat and power plant," Energy, Elsevier, vol. 213(C).
    3. Ma, Hongqiang & Xie, Yue & Duan, Kerun & Song, Xingpeng & Ding, Ruixiang & Hou, Caiqin, 2022. "Dynamic control method of flue gas heat transfer system in the waste heat recovery process," Energy, Elsevier, vol. 259(C).
    4. Lin, Xiaolong & Li, Qinlun & Wang, Lukai & Guo, Yifan & Liu, Yinhe, 2020. "Thermo-economic analysis of typical thermal systems and corresponding novel system for a 1000 MW single reheat ultra-supercritical thermal power plant," Energy, Elsevier, vol. 201(C).
    5. Zeng, Jimin & Liu, Lidong & Liang, Xiao & Chen, Shihe & Yuan, Jun, 2021. "Evaluating fuel consumption factor for energy conservation and carbon neutral on an industrial thermal power unit," Energy, Elsevier, vol. 232(C).
    6. 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).
    7. Ramadan, Mohamad & Khaled, Mahmoud & Haddad, Ahmad & Abdulhay, Bakri & Durrant, Andy & El Hage, Hicham, 2018. "An inhouse code for simulating heat recovery from boilers to heat water," Energy, Elsevier, vol. 157(C), pages 200-210.
    8. Ma, Hongqiang & Liang, Nuo & Liu, Yemin & Luo, Xinmei & Hou, Caiqin & Wang, Gang, 2021. "Experimental study on novel waste heat recovery system for sulfide-containing flue gas," Energy, Elsevier, vol. 227(C).

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