Numerical investigation of temperature distribution in the furnace of a coal fired grate boiler in part load conditions

  • Łukasz Więckowski Institute of Heat Engineering, Warsaw University of Technology
  • Piotr Krawczyk Institute of Heat Engineering, Warsaw University of Technology
  • Krzysztof Badyda Institute of Heat Engineering, Warsaw University of Technology

Abstract

Gas temperature distribution along the grate length in part load conditions is expected to be non-uniform and vary significantly from the nominal. The objective of this work was to simulate the combustion process inside the furnace of a WR-25 coal fired grate boiler at two part load conditions. The results obtained were then compared to on-site temperature profile measurements taken 0.8, 2 and 3.5 meters above the grate level. Numerical analysis was performed using a commercial CFD (computational fluid dynamics) code. Boundary conditions at the grate-freeboard interface were calculated with a black-box type model. Off-design air distribution along the grate was taken into account based on real unit inspection. Model predictions demonstrated a good overall qualitative match with measured temperature profiles, but a quantitative comparison shows a need for improvements in the modeling. It was also shown that more attention needs to be paid to the modeling of soot, as it has a major impact on predicted temperatures.
Published
2018-02-27
How to Cite
WIĘCKOWSKI, Łukasz; KRAWCZYK, Piotr; BADYDA, Krzysztof. Numerical investigation of temperature distribution in the furnace of a coal fired grate boiler in part load conditions. Journal of Power Technologies, [S.l.], v. 97, n. 5, p. 359--365, feb. 2018. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1263>. Date accessed: 01 dec. 2021.
Section
Research and Development in Power Engineering 2017

Keywords

Coal firing; grate boiler; combustion; soot; computational fluid dynamics

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