Exploring the hydrodynamics of dense beds of Geldart B and D gas-fluidized particles through the analysis of capacitance probe signals

被引:1
|
作者
Molignano, Laura [1 ,2 ]
Troiano, Maurizio [1 ,3 ]
Solimene, Roberto [3 ]
Tebianian, Sina [2 ]
Joly, Jean-Francois [2 ]
Salatino, Piero [1 ]
机构
[1] Univ Napoli Federico II, Dipartimento Ingn Chim Mat & Prod Industriale, Piazzale Tecchio 80, I-80125 Naples, Italy
[2] IFP Energies Nouvelles, Direct Concept Modelisationlisat Procedes, Rond Point Echangeur Solaize, F-69360 Solaize, France
[3] CNR, Ist Sci & Tecnol Energia & Mobil Sostenibili, Piazzale Tecchio 80, I-80125 Naples, Italy
关键词
Granular solid; Bubbling fluidized bed; Emulsion-phase voidage; Gas distribution; Mass transfer; Capacitance probe; MASS-TRANSFER COEFFICIENT; 2-PHASE THEORY; FLOW DISTRIBUTION; EMULSION PHASES; BUBBLE; VELOCITY; COMBUSTION; PRESSURE; BEHAVIOR; SOLIDS;
D O I
10.1016/j.powtec.2024.120174
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The hydrodynamics of Geldart B and D solids dense fluidized beds, of spherical/irregular morphology, have been characterized using capacitance probes at ambient temperature and 500 degrees C. A statistical approach applied to the time series of local bed voidage reveals, at specific experimental conditions, a characteristic bimodal distribution in the emulsion phase voidage: a more expanded, high-voidage, phase can be distinguished from a low-voidage phase with values close to minimum fluidization condition. Quantitative and qualitative differences among tested materials can be associated to different particles morphology. Emulsion phase voidages for the tested samples collapse on the same characteristic value once normalized with the voidages at incipient fluidization condition. The Richardson-Zaki equation proves to effectively correlate also in the bubbling fluidization regime the voidage and gas superficial velocity in the emulsion phase. The influence of hydrodynamics of fluidized bed dense phase on mass transfer in the emulsion phase is clearly highlighted.
引用
收藏
页数:17
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