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PROCEEDINGS OF JOINT MEETING OF SCANDINAVIAN -NORDIC AND ITALIAN SECTIONS OF THE COMBUSTION INSTITUTE
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FENOMENI DI SEGREGAZIONE DI FASI GASSOSE E DI PARTICELLE COMBUSTIBILI NELLA COMBUSTIONE DI SOLIDI IN LETTO FLUIDIZZATO
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CHARACTERIZATION OF SULPHATION AND HYDRATION-INDUCED REACTIVATION OF SORBENTS IN FLUIDIZED BED SYSTEMS
No full textEMISSIONE DI PARTICOLATO FINE ED ULTRAFINE NEL CORSO DELLA COMBUSTIONE IN LETTO FLUIDIZZATO DI SOLIDI DI DIFFERENTE NATURA
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A Fractal Approach To the Analysis of Low-temperature Combustion-rate of A Coal Char .2. Model Development
No full textThere is increasingly large body of evidence for the existence of carbons characterized by a porous structure amenable to a topological representation based on the concepts of fractal geometry (Part I[1] and references therein). Moving from these findings, a model based on simple hypotheses is proposed for the prediction of the combustion rate of carbons characterized by a fractal pore structure. Its concern is the low temperature combustion behavior of carbons under conditions typical of chemical, kinetically controlled regime. The soundness of the model is checked satisfactorily by comparing its predictions against those obtained by a more detailed approach based on the recursive application of the Thiele analysis. The proposed model provides a useful framework for interpreting the experimental results presented in Part I[1], obtained in combustion of char from a bituminous coal. It is inferred that diffusion of oxygen within micropores is strongly activated, even at the moderately high temperature used in the combustion experiments. The formation of relatively stable oxygen-carbon complexes by dissociative oxygen chemisorption and the scarce mobility of oxygen in the chemisorbed state are indicated as possible reasons for the limited accessibility of the micropore surface
Fluidization of Solids with CO2 at Pressures from Ambient to Supercritical
No full textBeds of two granular materials belonging to groups A-B and B of the Geldart classification of powders were fluidized by carbon dioxide at 35 degrees C and at 1 to 80 bar. Within this pressure interval, spanning from subcritical to supercritical conditions, the fluid density changes from the values typical of dilute gases to those of liquids. The hydrodynamic behavior of the bed changes accordingly. The bed behavior was investigated by visual inspection of the bed and by analysis of the time series of the pressure drop across the bed and of the heat-transfer coefficient between the bed and a hot wire probe. The boundaries between different captive fluidization regimes-incipient fluidization, onset of bubbling, and the incipient and fully established turbulent regime - were mapped in gas superficial velocity us. fluid density phase planes for the two granular materials investigated
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