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Thermal Radiation Heat Transfer and Biomass Combustion in a Large-Scale Fixed Bed Boiler

[+] Author Affiliations
T. K. Nilsson, T. Klason, X. S. Bai, B. Sundén

Lund Institute of Technology, Lund, Sweden

Paper No. IMECE2003-42249, pp. 405-413; 9 pages
doi:10.1115/IMECE2003-42249
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 2
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

The main focus of this work is to investigate the performance of some simple radiation models used in the thermal radiative heat transfer calculations in a 55 MWe fixed bed boiler with wet wood-chips as the fuel. An optically thin approach, Rosseland approximation, and the P1 -approximation were utilised in the investigation. A new optimised version, as it comes to computational speed, of the exponential wide band model (EWBM) is used. The initial calculations showed that the optically thick approach failed. The optically thin approach actually gave the best prediction of the temperature, if the mean beam length (Lm ) was chosen carefully. The P1 -approximation gave less good predictions than the best optical thin case, but it could be the best engineering model to use if little was known about the mean beam length. The conclusion is that the optically thin model is sensitive to the chosen mean beam length (Lm ) used in the EWBM. The P1 -approximation is almost insensitive to the choice of Lm , due to the consideration of radiation self-absorption, where the different predicted values of the incident radiation compensate for different values of Lm . For the same reason, the use of other solution techniques, such as DOM or DTM, may lead to the same conclusion, i.e., the insensitivity of the choice of Lm .

Copyright © 2003 by ASME

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