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Reducing the minimum load and NOx emissions for lignite-fired boiler by applying a stable-flame concept

Author

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  • Tsumura, Toshikazu
  • Okazaki, Hirofumi
  • Dernjatin, Pauli
  • Savolainen, Kati

Abstract

For the purpose of improving the load range and NOx emission level of lignite-fired power plants, a new combustion technology, called NR-LE burners (NOx Reduction-Load Extension), has been developed in co-operation between Babcock-Hitachi and Fortum. A single-burner combustion test was performed in Japan with this new NR-LE type burner using Czech lignite. Adapting the flame-stabilization ring and a special additional air-nozzle resulted in achieving a stable flame, which enables: - The burner minimum load to be less than 50% (Boiler load: 30-40%) - Low NOx emissions of less than 200 mg/m3 (6% O2, dry base) The first commercial full-scale application of the NR-LE burner was by the IPP power producer in the Czech Republic (Sokolovská Uhelná, a.s. at Vresová Unit2 boiler with steam parameters 325 t/h, 535 °C, 13.5 MPa). The commissioning test runs of the new burners were carried out during September to October 2001. The boiler is now in commercial operation, with (i) a 30% minimum load without supplementary fuel, and (ii) lower NOx emission levels.

Suggested Citation

  • Tsumura, Toshikazu & Okazaki, Hirofumi & Dernjatin, Pauli & Savolainen, Kati, 2003. "Reducing the minimum load and NOx emissions for lignite-fired boiler by applying a stable-flame concept," Applied Energy, Elsevier, vol. 74(3-4), pages 415-424, March.
    • Handle: RePEc:eee:appene:v:74:y:2003:i:3-4:p:415-424
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    Cited by:

    1. Liang, Zengying & Ma, Xiaoqian & Lin, Hai & Tang, Yuting, 2011. "The energy consumption and environmental impacts of SCR technology in China," Applied Energy, Elsevier, vol. 88(4), pages 1120-1129, April.
    2. Zeng, Guang & Xu, Mingchen & Tu, Yaojie & Li, Zhenwei & Cai, Yongtie & Zheng, Zhimin & Tay, Kunlin & Yang, Wenming, 2020. "Influences of initial coal concentration on ignition behaviors of low-NOx bias combustion technology," Applied Energy, Elsevier, vol. 278(C).
    3. Li, Zhengqi & Liu, Guangkui & Zhu, Qunyi & Chen, Zhichao & Ren, Feng, 2011. "Combustion and NOx emission characteristics of a retrofitted down-fired 660Â MWe utility boiler at different loads," Applied Energy, Elsevier, vol. 88(7), pages 2400-2406, July.
    4. Hodžić, Nihad & Kazagić, Anes & Smajević, Izet, 2016. "Influence of multiple air staging and reburning on NOx emissions during co-firing of low rank brown coal with woody biomass and natural gas," Applied Energy, Elsevier, vol. 168(C), pages 38-47.
    5. Elbaz, A.M. & Moneib, H.A. & Shebil, K.M. & Roberts, W.L., 2019. "Low NOX - LPG staged combustion double swirl flames," Renewable Energy, Elsevier, vol. 138(C), pages 303-315.
    6. Georgakellos, Dimitrios A., 2010. "Impact of a possible environmental externalities internalisation on energy prices: The case of the greenhouse gases from the Greek electricity sector," Energy Economics, Elsevier, vol. 32(1), pages 202-209, January.
    7. Qiao, Yanyu & Li, Song & Jing, Xinjing & Chen, Zhichao & Fan, Subo & Li, Zhengqi, 2022. "Combustion and NOx formation characteristics from a 330 MWe retrofitted anthracite-fired utility boiler with swirl burner under deeply-staged-combustion," Energy, Elsevier, vol. 258(C).
    8. Ma, Lun & Fang, Qingyan & Yin, Chungen & Wang, Huajian & Zhang, Cheng & Chen, Gang, 2019. "A novel corner-fired boiler system of improved efficiency and coal flexibility and reduced NOx emissions," Applied Energy, Elsevier, vol. 238(C), pages 453-465.
    9. Li, Zhengqi & Jing, Jianping & Liu, Guangkui & Chen, Zhichao & Liu, Chunlong, 2010. "Measurement of gas species, temperatures, char burnout, and wall heat fluxes in a 200-MWe lignite-fired boiler at different loads," Applied Energy, Elsevier, vol. 87(4), pages 1217-1230, April.

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