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SIMULATION AND ANALYSIS OF HEAT TRANSFER IN BUBBLING BED: CYLINDRICAL AND SPHERICAL PARTICLES
Ist Teil von
Fresenius environmental bulletin, 2017-01, p.4999
Ort / Verlag
Freising: Parlar Scientific Publications
Erscheinungsjahr
2017
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
In this paper, the cylindrical biomass was reconstructed by spherical element, and the traditional DEM was also improved. Heat transfer process of cylindrical and spherical particles in the fluidized bed was simulated by the modified DEM-CFD. Using FORTRAN program to extract information from the simulated images, and the effects of gas velocity and cylindrical biomass content on the temperature rise of binary particles was analysed. From two aspects of gas solid heat transfer and mixing index (MI), the mechanism was explained. The addition of cylindrical biomass was not conducive to the mixture of two-component particles, and mixing index (MI) decreased from 0.90 to 0.60, which had an inhibitory influence on the temperature rise of coal particles. Gas solid heat transfer mainly occurred in the vicinity of the air distribution plate in fluidized bed. With the increase of superficial gas velocity, the value of heat transfer rose, and the particle temperature was also higher. Compared with the flow of coal particles, the added cylindrical biomass weakened the gas solid heat transfer, which is mainly related to the decrease of the mixing index.