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An environment friendly and efficient lignite-fired power generation process based on a boiler with an open pulverizing system and the recovery of water from mill-exhaust

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  • Ma, Youfu
  • Yuan, Yichao
  • Jin, Jing
  • Zhang, Hua
  • Hu, Xiaohong
  • Shi, Dengyu

Abstract

This paper advances a novel lignite-fired power generation process based on a OPSB (boiler with an open pulverizing system) and the recovery of water from mill-exhaust after the comprehensive analysis of the open pulverizing system used for high-moisture coals and heat/water recovery from boiler exhaust. Then, the thermal calculation method that applies to OPSB is presented based on heat and mass balance analyses of the boiler. Finally, an efficient unit applying the OPSB process is compared with a conventional 600 MW lignite-fired power unit, and the performance of the efficient unit is calculated and discussed in detail. The results show that the efficient unit not only yields a notable increase in the boiler's (2.6%) and the power plant's (1.3%) thermal efficiency but also provides a remarkable advantage in water recovery due to the mass of water vapor concentrated in mill-exhaust. In the efficient unit, the volume fraction of water vapor in mill-exhaust reaches 34%, the water reclaimed from mill-exhaust is so much that a lignite-fired power plant with zero water consumption can be expected, while the pollutant emissions can be reduced in proportion to the increase in boiler thermal efficiency.

Suggested Citation

  • Ma, Youfu & Yuan, Yichao & Jin, Jing & Zhang, Hua & Hu, Xiaohong & Shi, Dengyu, 2013. "An environment friendly and efficient lignite-fired power generation process based on a boiler with an open pulverizing system and the recovery of water from mill-exhaust," Energy, Elsevier, vol. 59(C), pages 105-115.
    • Handle: RePEc:eee:energy:v:59:y:2013:i:c:p:105-115
    DOI: 10.1016/j.energy.2013.06.073
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    References listed on IDEAS

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    1. Han, Xiaoqu & Liu, Ming & Wang, Jinshi & Yan, Junjie & Liu, Jiping & Xiao, Feng, 2014. "Simulation study on lignite-fired power system integrated with flue gas drying and waste heat recovery – Performances under variable power loads coupled with off-design parameters," Energy, Elsevier, vol. 76(C), pages 406-418.
    2. 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.
    3. Ma, Youfu & Zhang, Hua & Yuan, Yichao & Wang, Zhiyun, 2015. "Optimization of a lignite-fired open pulverizing system boiler process based on variations in the drying agent composition," Energy, Elsevier, vol. 81(C), pages 304-316.
    4. 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.
    5. Chantasiriwan, Somchart, 2021. "Optimum installation of flue gas dryer and additional air heater to increase the efficiency of coal-fired utility boiler," Energy, Elsevier, vol. 221(C).
    6. Liu, Ming & Wu, Dongyin & Xiao, Feng & Yan, JunJie, 2015. "A novel lignite-fired power plant integrated with a vacuum dryer: System design and thermodynamic analysis," Energy, Elsevier, vol. 82(C), pages 968-975.
    7. Ma, Youfu & Chi, Tonghui & Yu, Yi & Lyu, Junfu & Wang, Zirui, 2024. "A green and efficient lignite-fired power generation process based on superheated-steam-dried open pulverizing system," Energy, Elsevier, vol. 294(C).
    8. 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.
    9. Karasmanaki, Evangelia & Ioannou, Konstantinos & Katsaounis, Konstantinos & Tsantopoulos, Georgios, 2020. "The attitude of the local community towards investments in lignite before transitioning to the post-lignite era: The case of Western Macedonia, Greece," Resources Policy, Elsevier, vol. 68(C).
    10. Zbigniew Plutecki & Paweł Sattler & Krystian Ryszczyk & Anna Duczkowska & Stanisław Anweiler, 2020. "Thermokinetics of Brown Coal during a Fluidized Drying Process," Energies, MDPI, vol. 13(3), pages 1-16, February.
    11. 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.
    12. Fan, Haojie & Xu, Wei & Zhang, Jian & Zhang, Zhongxiao, 2021. "Steam temperature regulation characteristics in a flexible ultra-supercritical boiler with a double reheat cycle based on a cell model," Energy, Elsevier, vol. 229(C).

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