Gas exchange between the bubble and emulsion phases in gas-solid fluidized beds

✍ Scribed by T. Chiba; H. Kobayashi

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 967 KB
• Volume: 25
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(70)85060-6

✦ Synopsis

Experimental studies for measuring the extent of gas exchange between the bubble and emulsion phases in gas-solid fluidized beds were conducted using ozone as a tracer. Measurements were made on the changes of ozone concentration immediately inside the bubbles which were injected successively into the incipiently air fluidized bed. Exchange coefficients thus obtained were compared with those predicted theoretically and were found to be in good agreement. It was concluded from these results that the model used in this study based on the diffusional gas exchange between clouds and the emulsion phase was reasonable.

The exchange coefficient values measured for single bubbles, as seen in this study, were found to be roughly one third of that obtained from freely bubbling fluidized beds, which fact was attributed to the coalescence of bubbles in the freely bubbling beds.

The effect of gas adsorption on the surface of the particles was estimated and discussed.