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Impact of blending ratio and injection position on slagging behavior in a 1000 MWe wall-fired furnace with a modified viscosity model

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Abstract

A commercial CFD package coupled with user-defined functions was used to observe coal particle combustion and tracking, particle capturing and deposition, and other related phenomena. A modified Watt-Fereday model for deposition employing experimental coefficients derived from the ash fusion test was used to predict ash viscosity, which showed that the samples had a nonadditive behavior due to the eutectic phenomenon. The furnace results showed that when the Bayan coal, containing a large amount of volatile matters, was injected at the top burner, the slagging propensity increased compared to when it was injected in the bottom burner. In addition, the specific blending ratio of 25 % Flame and 75 % Bayan coal, which had a lower melting temperature compared to the individual coals. This study suggests that sub-bituminous coal should be injected in the bottom burner, and the specific blending ratio that yields a low-temperature eutectic mixture should be avoided.

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Acknowledgments

This work was supported by the R&D fund of Doosan Heavy Industries & Construction.

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Authors and Affiliations

  1. Corporate R&D Institute, Doosan Heavy Industries & Construction, Volvoro 22, Seongsangu, Changwon, 51711, Korea

    Byoung-Hwa Lee & Joong-Hyun Lim

Authors
  1. Byoung-Hwa Lee
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  2. Joong-Hyun Lim
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Correspondence to Byoung-Hwa Lee.

Additional information

Byoung-Hwa Lee received his B.S. degree in Mechanical Engineering from Korea Maritime University in 2003. He received his Ph.D. degree from Pusan National University in 2011. He is currently a principal research engineer at Corporate R&D Institute of Doosan Heavy Industries & Construction.

Joong-Hyun Lim received his B.S. degree in Mechanical Engineering from Yonsei University in 2012. He is currently a senior research engineer at Corporate R&D Institute of Doosan Heavy Industries & Construction.

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Lee, BH., Lim, JH. Impact of blending ratio and injection position on slagging behavior in a 1000 MWe wall-fired furnace with a modified viscosity model. J Mech Sci Technol 34, 4841–4856 (2020). https://doi.org/10.1007/s12206-020-1040-4

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  • DOI: https://doi.org/10.1007/s12206-020-1040-4

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