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Investigation on the off-design performances of flue gas pre-dried lignite-fired power system integrated with waste heat recovery at variable external working conditions

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  • Han, Xiaoqu
  • Liu, Ming
  • Zhai, Mengxu
  • Chong, Daotong
  • Yan, Junjie
  • Xiao, Feng

Abstract

This paper describes a simulation investigation on the FPLPS (flue gas pre-dried lignite-fired power system) integrated with WHR (waste heat recovery). The plant thermal efficiency of a 600 MW power unit based on FPLPS is found to be improved by 1.70% compared with the CLPS (conventional lignite-fired power system) unit and the water saving is 81 t h−1. The WHR system is composed of air pre-heater and condensate pre-heater. The contributions of condensate pre-heating to the improvement in plant thermal efficiency and water saving are 0.19% and 34 t h−1, respectively. Moreover, the impacts of power load, ambient air temperature, and raw lignite moisture content on the off-design performances of FPLPS are studied. Simulation results suggest that the improvement in plant thermal efficiency remains around 1.70% with the decreasing power load. Lower ambient conditions lead to an increase in plant thermal efficiency and water saving with the safety operation of the boiler air heater due to the existence of air pre-heater in WHR system. In addition, the plant thermal efficiency of FPLPS increases slightly with the raw lignite moisture content, indicating that FPLPS is more suitable for firing lignite with high moisture content.

Suggested Citation

  • Han, Xiaoqu & Liu, Ming & Zhai, Mengxu & Chong, Daotong & Yan, Junjie & Xiao, Feng, 2015. "Investigation on the off-design performances of flue gas pre-dried lignite-fired power system integrated with waste heat recovery at variable external working conditions," Energy, Elsevier, vol. 90(P2), pages 1743-1758.
    • Handle: RePEc:eee:energy:v:90:y:2015:i:p2:p:1743-1758
    DOI: 10.1016/j.energy.2015.06.136
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    References listed on IDEAS

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    5. Han, Xiaoqu & Liu, Ming & Wu, Kaili & Chen, Weixiong & Xiao, Feng & Yan, Junjie, 2016. "Exergy analysis of the flue gas pre-dried lignite-fired power system based on the boiler with open pulverizing system," Energy, Elsevier, vol. 106(C), pages 285-300.
    6. Ioannis Avagianos & Dimitrios Rakopoulos & Sotirios Karellas & Emmanouil Kakaras, 2020. "Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation," Energies, MDPI, vol. 13(24), pages 1-41, December.
    7. Jiayou Liu & Xiaoyun Gong & Wenhua Zhang & Fengzhong Sun & Qingbiao Wang, 2020. "Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions," Energies, MDPI, vol. 13(2), pages 1-19, January.
    8. Xiao, Pengcheng & Zhang, Yanping & Wang, Yuanjing & Wang, Jizhou, 2019. "Analysis of an improved economizer system for active control of the coal-fired boiler flue gas temperature," Energy, Elsevier, vol. 170(C), pages 185-198.
    9. Li, Yong & Wang, Yanhong & Cao, Lihua & Hu, Pengfei & Han, Wei, 2018. "Modeling for the performance evaluation of 600 MW supercritical unit operating No.0 high pressure heater," Energy, Elsevier, vol. 149(C), pages 639-661.
    10. Chauhan, Shivendra Singh & Khanam, Shabina, 2019. "Enhancement of efficiency for steam cycle of thermal power plants using process integration," Energy, Elsevier, vol. 173(C), pages 364-373.
    11. Wei, Maolin & Zhao, Xiling & Fu, Lin & Zhang, Shigang, 2017. "Performance study and application of new coal-fired boiler flue gas heat recovery system," Applied Energy, Elsevier, vol. 188(C), pages 121-129.
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