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LES of Pulverized Coal Combustion Furnaces

[+] Author Affiliations
Kenji Yamamoto, Daisuke Kina, Teruyuki Okazaki, Masayuki Taniguchi, Hirofumi Okazaki

Hitachi, Ltd., Hitachinaka, Ibaraki, Japan

Kenichi Ochi

Babcock-Hitachi K. K., Hiroshima, Japan

Paper No. POWER2011-55367, pp. 131-139; 9 pages
doi:10.1115/POWER2011-55367
From:
  • ASME 2011 Power Conference collocated with JSME ICOPE 2011
  • ASME 2011 Power Conference, Volume 1
  • Denver, Colorado, USA, July 12–14, 2011
  • ISBN: 978-0-7918-4459-5
  • Copyright © 2011 by ASME

abstract

LES (large eddy simulation) is applied to combustion simulations of two large scale pulverized coal-fired furnaces. One application is a boiler furnace with the coal feed rate of 3,000 kg/h. The results of LES show good agreement in not only distributions of temperature, NO concentration, and CO concentration on the vertical center line but also NO and CO emissions and UBC (unburned carbon in ash). The calculation error of NO emission is 10%. The other application is a horizontal furnace with a low NOx burner with the coal feed rate of 560 kg/h. LES predicts temperatures and oxygen concentrations accurately; but the standard k-ε model does not. The flame width calculated by the standard k-ε model is narrower than that by LES. These calculated results indicate that the drawback of the standard k-ε model is its low calculation accuracy for the coal jet flame decay and lift-off height.

Copyright © 2011 by ASME
Topics: Combustion , Coal , Furnaces

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