TY - JOUR
T1 - Dynamics of gas-particle flow in circulating fluidized beds
AU - Srivastava, A.
AU - Agrawal, K.
AU - Sundaresan, Sankaran
AU - Karri, Reddy S.B.
AU - Knowlton, T. M.
N1 - Funding Information:
This work was supported by the National Science Foundation (Grant CTS-9421661, Fluid, Particulate and Hydraulic Systems) and the Exxon Foundation. The assistance of Mike Arrington and Kevin Pickering in performing the experiments is gratefully acknowledged.
PY - 1998/12/1
Y1 - 1998/12/1
N2 - The flow of gas-particle mixtures in a circulating fluidized bed has been studied, probing the flow behavior under both stable and unstable operating conditions. A novel feature of our work is the use of electrical capacitance tomography to image particle distribution over the cross-section at one elevation in the standpipe. In addition, we have also obtained data on pressure profile and aeration rate in the standpipe, particle circulation rate in the circulating fluidized bed and riser gas flow rate under various operating conditions. Here, we report experimental results obtained for two different particles, both belonging to Geldart type A. At low aeration rates, a stable dense phase flow is obtained in the standpipe. At high aeration rates, the flow became unstable, manifesting low frequency oscillations in the flow characteristics. Our results suggest that, under conditions explored in the present study, this instability originates in the standpipe and that any attempt to model it should consider the interaction between the various components of the circulating fluidized bed system.
AB - The flow of gas-particle mixtures in a circulating fluidized bed has been studied, probing the flow behavior under both stable and unstable operating conditions. A novel feature of our work is the use of electrical capacitance tomography to image particle distribution over the cross-section at one elevation in the standpipe. In addition, we have also obtained data on pressure profile and aeration rate in the standpipe, particle circulation rate in the circulating fluidized bed and riser gas flow rate under various operating conditions. Here, we report experimental results obtained for two different particles, both belonging to Geldart type A. At low aeration rates, a stable dense phase flow is obtained in the standpipe. At high aeration rates, the flow became unstable, manifesting low frequency oscillations in the flow characteristics. Our results suggest that, under conditions explored in the present study, this instability originates in the standpipe and that any attempt to model it should consider the interaction between the various components of the circulating fluidized bed system.
KW - Capacitance tomography
KW - Circulating fluidized bed
KW - FCC particles
KW - Instability
KW - Standpipe flow
UR - http://www.scopus.com/inward/record.url?scp=0032403821&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032403821&partnerID=8YFLogxK
U2 - 10.1016/S0032-5910(98)00138-7
DO - 10.1016/S0032-5910(98)00138-7
M3 - Article
AN - SCOPUS:0032403821
SN - 0032-5910
VL - 100
SP - 173
EP - 182
JO - Powder Technology
JF - Powder Technology
IS - 2-3
ER -