TY - JOUR
T1 - The correlation based zonal method and its application to the back pass channel of oxy/air-fired CFB boiler
AU - Bordbar, Mohammad Hadi
AU - Hyppänen, Timo
PY - 2015/3/5
Y1 - 2015/3/5
N2 - 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.
AB - 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.
KW - Circulating fluidized bed
KW - Correlation based zone method (CBZM)
KW - Direct exchange area
KW - Non-gray gas modeling
KW - Numerical modeling
KW - Oxygen fired combustion
KW - Radiative zone method
UR - http://www.scopus.com/inward/record.url?scp=84921334108&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2014.12.046
DO - 10.1016/j.applthermaleng.2014.12.046
M3 - Article
AN - SCOPUS:84921334108
VL - 78
SP - 351
EP - 363
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
ER -