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Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion
Author(s) -
Wickramasinghe Chathuranga,
Narayana Mahinsasa,
Amarasinghe A. D. U. Shantha
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000246
Subject(s) - freeboard , turbulence , combustion , fluidized bed , biomass (ecology) , environmental science , mechanics , computational fluid dynamics , waste management , thermodynamics , process engineering , nuclear engineering , chemistry , engineering , physics , ecology , biology , organic chemistry
Fluidized‐bed combustion is a very popular technology used to convert solid biomass into thermal energy, which has many advantages over other conversion technologies. However, these advantages strongly depend on the freeboard combustion. This study focuses on the effect of turbulence of the freeboard via developing a comprehensive mathematical model including four‐way coupling, biomass thermal decomposition, and turbulent combustion by means of an Eulerian‐Lagrangian framework. The validated model predicts with significant accuracy for all gas species when turbulence modeling is improved. The optimum amount of the secondary air ratio and the optimum excess air ratio were determined, which give a higher freeboard temperature while maintaining minimum emission.