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Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant

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  • Stevanovic, Vladimir D.
  • Wala, Tadeusz
  • Muszynski, Slawomir
  • Milic, Milos
  • Jovanovic, Milorad

Abstract

An additional high pressure economizer was installed at Unit B1 of the 620 MWe lignite-fired Power Plant “Nikola Tesla B” after 30 years of its operation. An innovative connection of the new additional economizer was applied. It is in parallel connection to the first section of the originally built economizer and it is directly fed with the feedwater from the outlet of the feedwater pump. The analysis of Unit B1 operation with such an economizer arrangement is performed and it is supported by measured data. It is shown that more than 30 MWth of the flue gas waste heat is recovered. The Unit gross efficiency is increased by 0.53 percentage points, which leads to 9.4 MWe of the electric power production. The parallel connection of the additional economizer also leads to the partial feedwater bypass of the high pressure heaters, which enables an increase of the plant electric power by up to 24.5 MWe. The accompanying effects are the reduction of the pressure drop in the feedwater line and the economizers, which leads to the decrease of the energy consumption for the main feedwater pump operation. The applied solution is presented together with measured and calculated energy and economic benefits.

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  • Stevanovic, Vladimir D. & Wala, Tadeusz & Muszynski, Slawomir & Milic, Milos & Jovanovic, Milorad, 2014. "Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant," Energy, Elsevier, vol. 66(C), pages 907-918.
    • Handle: RePEc:eee:energy:v:66:y:2014:i:c:p:907-918
    DOI: 10.1016/j.energy.2014.01.001
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    3. Ma, Youfu & Yang, Lijuan & Lu, Junfu & Pei, Yufeng, 2016. "Techno-economic comparison of boiler cold-end exhaust gas heat recovery processes for efficient brown-coal-fired power generation," Energy, Elsevier, vol. 116(P1), pages 812-823.
    4. Jiayou Liu & Fengzhong Sun, 2019. "Experimental Study on Operation Regulation of a Coupled High–Low Energy Flue Gas Waste Heat Recovery System Based on Exhaust Gas Temperature Control," Energies, MDPI, vol. 12(4), pages 1-20, February.
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    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. 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.
    9. Meng Yue & Guoqian Ma & Yuetao Shi, 2020. "Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control," Energies, MDPI, vol. 13(16), pages 1-22, August.
    10. 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).
    11. Chen, Heng & Wu, Yunyun & Qi, Zhen & Chen, Qiao & Xu, Gang & Yang, Yongping & Liu, Wenyi, 2019. "Improved combustion air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit," Energy, Elsevier, vol. 169(C), pages 527-541.
    12. Lin, Xiaolong & Liu, Yinhe & Song, Huchao & Liu, Yugang, 2023. "System design for 700 °C power plants: Integration scheme and performance evaluation," Energy, Elsevier, vol. 267(C).
    13. Jiayou Liu & Fengzhong Sun, 2019. "Node Temperature of the Coupled High-Low Energy Grade Flus Gas Waste Heat Recovery System," Energies, MDPI, vol. 12(2), pages 1-16, January.
    14. 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).
    15. Stevanovic, Vladimir D. & Ilic, Milica & Djurovic, Zeljko & Wala, Tadeusz & Muszynski, Slawomir & Gajic, Ivan, 2018. "Primary control reserve of electric power by feedwater flow rate change through an additional economizer – A case study of the thermal power plant “Nikola Tesla B”," Energy, Elsevier, vol. 147(C), pages 782-798.
    16. Yang, Mei & Liu, Chao, 2017. "The calculation of fluorine plastic economizer in economy by using the equivalent heat drop," Energy, Elsevier, vol. 135(C), pages 674-684.
    17. Yan, Min & Zhang, Liang & Shi, Yuetao & Zhang, Liqiang & Li, Yuzhong & Ma, Chunyuan, 2018. "A novel boiler cold-end optimisation system based on bypass flue in coal-fired power plants: Heat recovery from wet flue gas," Energy, Elsevier, vol. 152(C), pages 84-94.
    18. 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).
    19. Liu, Yinhe & Li, Qinlun & Duan, Xiaoli & Zhang, Yun & Yang, Zhen & Che, Defu, 2018. "Thermodynamic analysis of a modified system for a 1000 MW single reheat ultra-supercritical thermal power plant," Energy, Elsevier, vol. 145(C), pages 25-37.

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