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Numerical research on the SNCR method in a grate boiler equipped with the innovative FJBS system

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  • Garbacz, Przemysław
  • Wejkowski, Robert

Abstract

The paper describes numerical simulations of processes occurring in the combustion chamber of a stoker boiler. The main topic of CFD analysis presented in this paper is the process of reducing nitrogen oxides emission using the patented Furnace Jet Boiler System (FJBS) in combination with the selective non-catalytic reduction (SNCR) method (FJBS+). The presented method is characterized by introducing a compressed urea-air mixture into the furnace. The reagent is injected through supersonic nozzles, the operating conditions of which are shown on a separate CFD model. The developed model enabled optimization of the existing NOx reduction system, especially in the case of a boiler operating at maximum load. The overall effect of the operation of FJBS + technology is a significant reduction of NOx emissions, by approximately 57%. The results achieved are comparable to those obtained from measurements. It was also confirmed that the operation of FJBS + has a positive effect on the equalization of temperature distribution in the furnace and the concentration of flue gas components. Finally, a sensitivity analysis on the basis of two parameters, specific heat of the fuel and thermal conductivity is presented.

Suggested Citation

  • Garbacz, Przemysław & Wejkowski, Robert, 2020. "Numerical research on the SNCR method in a grate boiler equipped with the innovative FJBS system," Energy, Elsevier, vol. 207(C).
    • Handle: RePEc:eee:energy:v:207:y:2020:i:c:s0360544220313475
    DOI: 10.1016/j.energy.2020.118240
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    References listed on IDEAS

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    1. Costa, M. & Massarotti, N. & Indrizzi, V. & Rajh, B. & Yin, C. & Samec, N., 2014. "Engineering bed models for solid fuel conversion process in grate-fired boilers," Energy, Elsevier, vol. 77(C), pages 244-253.
    2. Yin, Chungen & Rosendahl, Lasse & Clausen, Sønnik & Hvid, Søren L., 2012. "Characterizing and modeling of an 88 MW grate-fired boiler burning wheat straw: Experience and lessons," Energy, Elsevier, vol. 41(1), pages 473-482.
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    Cited by:

    1. Jiao, Anyao & Zhou, Zining & Yang, Xiuchao & Xu, Hongtao & Liu, Feng & Liao, Xiaowei & Liu, Jiaxun & Jiang, Xiumin, 2023. "The crucial role of oxygen in NO heterogeneous reduction with NH3 at high temperature," Energy, Elsevier, vol. 284(C).

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