Numerical analysis of operating conditions for establishing high-density circulating fluidized bed by CPFD method

The effects of operating conditions on the gas-solid hydrodynamics in a high-density CFB are numerically studied using the computational particle fluid dynamics approach. With the increase of standpipe bottom aeration rate, the solids circulation rate increases within the range of stable operation,...

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Bibliographic Details
Published in:Powder technology 2018-10, Vol.338, p.446-457
Main Authors: Ma, Qiao, Lei, Fulin, Xiao, Yunhan
Format: Article
Language:English
Subjects:
Aeration
Computational fluid dynamics
Computer applications
CPFD
Density
Flow rates
Fluctuations
Fluid dynamics
Fluid flow
Fluid mechanics
Fluidized beds
Flux
Full-loop simulation
High-density CFB
Hydrodynamics
Numerical analysis
Packed beds
Pressure
Pressure drop
Solids
Standpipe aeration
Unsteady flow
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Summary:The effects of operating conditions on the gas-solid hydrodynamics in a high-density CFB are numerically studied using the computational particle fluid dynamics approach. With the increase of standpipe bottom aeration rate, the solids circulation rate increases within the range of stable operation, while the packed bed height in the standpipe decreases. The same tendency is found for the standpipe aeration rate, however, it is more efficient than the bottom aeration rate to increase solids flux. With the increase of the solids inventory, the solids flux shows a parabolic relation with it, however, the standpipe pressure drop increases almost linearly under the fixed aeration conditions. The riser flowrate has only small effect on solids circulation behavior. The aeration distribution in the valve has little influence on solids flux, however, it affects significantly the valve pressure drop and transient flow behavior. The number of aeration ports on the standpipe does not influence solids flux much, but it affects the hydrodynamics stability of the standpipe. [Display omitted] •The effects of operating conditions were studied by 3D full-loop simulation of a HDCFB.•With increase of standpipe aeration rate, solids flux increases while packed bed shortens.•Solids flux is parabolic while standpipe pressure drop is linear with solids inventory.•Riser flowrate and the valve aeration distribution show little influence on solids flux.•Number of aeration ports has small influence on solids flux but affects hydrodynamics stability.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2018.07.012