A1 Journal article (refereed), original research

The Correlation Based Zonal Method and Its Application to the Back Pass Channel of Oxy/Air-Fired CFB Boiler


Publication Details
Authors: Bordbar Mohammadhadi, Hyppänen Timo
Publication year: 2015
Language: English
Related Journal or Series Information: Applied Thermal Engineering
Volume number: 78
Issue number: 5
Start page: 351
End page: 363
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract
A set of correlations for direct exchange area (DEA) between zones are presented. The correlations are simpler and much faster than the classical method used for DEA calculations in zone method. Additionally a unique form of correlation supports both singular and non-singular DEA calculation and no extra effort for non-singular cases is needed. Using the new correlations, the correlation based zone method (CBZM) is introduced and validated by several benchmarks. The CBZM results were in excellent agreement with the benchmark solutions. As an application case, by using the CZBM the gray and non-gray radiative heat transfer has been analyzed in a large back pass channel of a CFB boiler for the case of air and oxygen-fired combustion scenarios. The effect of the spectral radiative behavior of combustion gases on the predicted radiative heat fluxes on the walls is addressed. The effect of combustion scenario on the operation of the unit is also discussed.

Last updated on 2017-22-03 at 14:58