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

Toshikazu Tsumura, Hirofumi Okazaki, Pauli Dernjatin and Kati Savolainen

Applied Energy, 2003, vol. 74, issue 3-4, 415-424

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.

Keywords: Lignite; coal; combustion; Low; NOx; burner; NOx; reduction; Minimum; load (search for similar items in EconPapers)
Date: 2003
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Citations: View citations in EconPapers (9)

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