Predicting axial pressure profile of a CFB
Küçük Resim Yok
Tarih
2008
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ELSEVIER SCIENCE SA
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The numerical simulation of CFBs is an important tool in the prediction of its flow behavior. Predicting the axial pressure profile is one of the major difficulties in modeling a CFB. A model using a Particle Based Approach (PBA) is developed to accurately predict the axial pressure profile in CFBs. The simulation model accounts for the axial and radial distribution of voidage and velocity of the gas and solid phases, and for the solids volume fraction and particle size distribution of the solid phase. The model results are compared with and validated against atmospheric cold CFB experimental literature data. Ranges of experimental data used in comparisons are as follows: bed diameter from 0.05 to 0.305 m, bed height between 5 and 15.45 m, mean particle diameter from 76 to 812 mu m, particle density from 189 to 2600 kg/m(3), solid circulation fluxes from 10.03 to 489 kg/m(2) s and gas superficial velocities from 2.71 to 10.68 m/s. The computational results agreed reasonably well with the experimental data. Moreover, both experimental data and model predictions show that the pressure drop profile is affected by the solid circulation flux and superficial velocity values in the riser. The pressure drop increases along the acceleration region as solid circulation flux increases and superficial velocity decreases. (C) 2007 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
circulating fluidized bed, hydrodynamic model, pressure drop, acceleration zone, numerical simulation
Kaynak
CHEMICAL ENGINEERING JOURNAL
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
140
Sayı
45352
