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A novel lignite-fired power plant integrated with a vacuum dryer: System design and thermodynamic analysis

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  • Liu, Ming
  • Wu, Dongyin
  • Xiao, Feng
  • Yan, JunJie

Abstract

Pre-drying of lignite before feeding to the boiler is a potential way to increase the net efficiency of lignite-fired power plants. Lignite pre-drying is, however, a high energy consumption process with a high risk of spontaneous ignition. If the lignite is dried at low temperature, the possibility of spontaneous ignition of lignite in the drying process could be lowed. Furthermore that low temperature energy could be used as the drying heating source may result in a high net efficiency of the power plant. Therefore, we designed a lignite-fired power plant integrated with a vacuum dryer. We also thermodynamically analyzed a reference case of a 1000 MW power plant by using theoretical models developed. The results show that the net efficiency of power plant can be increased by 2.39% or 1.88% absolutely, if a low-pressure steam or heat pump is used to provide the drying heat source, respectively. From analyzing main factors, we discovered that the net efficiency of the power plant increases with the drying degree and decreases with the operating pressure of the dryer, and the heat pump is a better choice to provide the heating source for drying purposes with its second-law efficiency higher than 0.76.

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  • 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.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:968-975
    DOI: 10.1016/j.energy.2015.01.106
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    2. Wang, Yanhong & Cao, Lihua & Hu, Pengfei & Li, Bo & Li, Yong, 2019. "Model establishment and performance evaluation of a modified regenerative system for a 660 MW supercritical unit running at the IPT-setting mode," Energy, Elsevier, vol. 179(C), pages 890-915.
    3. 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.
    4. Li, Zixiang & Miao, Zhengqing & Zhou, Yan & Wen, Shurong & Li, Jiangtao, 2018. "Influence of increased primary air ratio on boiler performance in a 660 MW brown coal boiler," Energy, Elsevier, vol. 152(C), pages 804-817.
    5. Heng Chen & Zhen Qi & Qiao Chen & Yunyun Wu & Gang Xu & Yongping Yang, 2018. "Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit," Energies, MDPI, vol. 11(9), pages 1-16, September.

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