Effect of Bed Diameter on the Hydrodynamics of Gas-Solid Fluidized Beds

سال انتشار: 1389
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 72

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شناسه ملی سند علمی:

JR_IJCCE-29-3_004

تاریخ نمایه سازی: 17 خرداد 1404

چکیده مقاله:

Effect of scale on the hydrodynamics of gas-solid fluidized beds was investigated in two fluidized beds of ۱۵۲ mm and ۷۸ mm in diameter.  Air at room temperature was used as the fluidizing gas in the bed of sand particles. The Radioactive Particle Tracking (RPT) technique was employed to obtain the instantaneous positions of the particles at every ۲۰ ms of the experiments. These data were used to calculate hydrodynamic parameters, such as mean velocity of upward and downward-moving particles, jump frequency, cycle frequency and axial and radial diffusivities, which are representative of solid mixing and diffusion of particles in the bed.  These hydrodynamic parameters were compared in both scales in order to determine the scale effect on the hydrodynamics of the gas-solid fluidized bed.  In all cases, it was shown that solid mixing and diffusivity of particles increase by increasing column diameter.  The results of this study would help to understand solid mixing which might be critical in industrial fluidized bed reactors.

کلیدواژه ها:

Scale effects ، Fluidized bed ، Radioactive Particle Tracking (RPT)

نویسندگان

Hamed Bashiri

Faculty of Chemical Engineering, University of Tehran, P.O. Box ۱۱۱۵۵/۴۵۶۳ Tehran, I.R. IRAN

Navid Mostoufi

Faculty of Chemical Engineering, University of Tehran, P.O. Box ۱۱۱۵۵/۴۵۶۳ Tehran, I.R. IRAN

Rahmat Sotudeh-Gharebagh

Faculty of Chemical Engineering, University of Tehran, P.O. Box ۱۱۱۵۵/۴۵۶۳ Tehran, I.R. IRAN

Jamal Chaouki

Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box ۶۰۷۹, Station Centre-Ville, Montreal, Québec, H۳C ۳A۷, CANADA

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