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An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant

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  • Xu, Cheng
  • Xu, Gang
  • Zhao, Shifei
  • Zhou, Luyao
  • Yang, Yongping
  • Zhang, Dongke

Abstract

A novel concept of improved configuration of lignite pre-drying using a supplementary steam cycle incorporated in a lignite fired supercritical power plant was proposed in this study. Differing from the conventional lignite pre-drying power plant configuration, in this lignite pre-drying power plant (LPDPP) concept, the steam bleeds for the dryer and some regenerative heaters (RHs) are redirected from the high pressure turbines and low pressure turbines through a separate turbine named the Regenerative-turbine (R-turbine). With the R-turbine in place, the degree of super-heating of the bleeds for the dryer and for RH3–RH5 is significantly reduced, thus leading to a reduction in the heat transfer temperature difference and exergy destruction rate. The net energy efficiency and the economic benefits of the proposed LPDPP are also enhanced as compared to the conventional configuration. The analysis showed that, for a 600MW supercritical LPDPP, the exergy destruction of the dryer could be reduced from 14.23MWth in the conventional configuration to 13.25MWth in the proposed design. The net energy efficiency could be further improved by 0.3 percentages points with a heat rate reduction of approximately 59.4kJ/kWh. The net economic benefit of the proposed LPDPP could reach $47.6M per year, which is $0.9M greater than that of the conventional lignite pre-drying unit.

Suggested Citation

  • Xu, Cheng & Xu, Gang & Zhao, Shifei & Zhou, Luyao & Yang, Yongping & Zhang, Dongke, 2015. "An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant," Applied Energy, Elsevier, vol. 160(C), pages 882-891.
    • Handle: RePEc:eee:appene:v:160:y:2015:i:c:p:882-891
    DOI: 10.1016/j.apenergy.2015.01.083
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    11. Atsonios, K. & Violidakis, I. & Sfetsioris, K. & Rakopoulos, D.C. & Grammelis, P. & Kakaras, E., 2016. "Pre-dried lignite technology implementation in partial load/low demand cases for flexibility enhancement," Energy, Elsevier, vol. 96(C), pages 427-436.
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    13. Braimakis, Konstantinos & Magiri-Skouloudi, Despina & Grimekis, Dimitrios & Karellas, Sotirios, 2020. "Εnergy-exergy analysis of ultra-supercritical biomass-fuelled steam power plants for industrial CHP, district heating and cooling," Renewable Energy, Elsevier, vol. 154(C), pages 252-269.
    14. Yu Han & Cheng Xu & Gang Xu & Yuwen Zhang & Yongping Yang, 2017. "An Improved Flexible Solar Thermal Energy Integration Process for Enhancing the Coal-Based Energy Efficiency and NO x Removal Effectiveness in Coal-Fired Power Plants under Different Load Conditions," Energies, MDPI, vol. 10(10), pages 1-18, September.
    15. Han, Yu & Sun, Yingying & Wu, Junjie, 2023. "A novel solar-driven waste heat recovery system in solar-fuel hybrid power plants," Energy, Elsevier, vol. 285(C).
    16. Song, Yawei & Su, Sheng & Chen, Yifeng & Liu, Yushuai & Zhao, Zheng & Wang, Jingyan & Ren, Qiangqiang & Han, Hengda & Xu, Kai & Xu, Jun & Jiang, Long & Wang, Yi & Hu, Song & Xiang, Jun, 2023. "Effects of moisture on soot generation and ignition of coal particle: Investigation and evaluation with OH-planar laser induced fluorescence," Energy, Elsevier, vol. 278(PA).
    17. 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.
    18. Halina Pawlak–Kruczek & Michał Czerep & Lukasz Niedzwiecki & Emmanouil Karampinis & Ioannis Violidakis & Ioannis Avagianos & Panagiotis Grammelis, 2019. "Drying of Lignite of Various Origins in a Pilot Scale Toroidal Fluidized Bed Dryer using Low Quality Heat," Energies, MDPI, vol. 12(7), pages 1-22, March.
    19. Pawlak-Kruczek, Halina & Niedźwiecki, Łukasz & Ostrycharczyk, Michał & Czerep, Michał & Plutecki, Zbigniew, 2019. "Potential and methods for increasing the flexibility and efficiency of the lignite fired power unit, using integrated lignite drying," Energy, Elsevier, vol. 181(C), pages 1142-1151.

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