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3D numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating

3D numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating

Benoit, Hadrien, Ansart, Renaud, Neau, Herve, García-Triñanes, Pablo ORCID: 0000-0002-4993-2250, Flamant, Gilles and Simonin, Olivier (2018) 3D numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating. AIChE Journal, 64 (11). pp. 3857-3867. ISSN 0001-1541 (Print), 1547-5905 (Online) (doi:https://doi.org/10.1002/aic.16218)

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Abstract

Solid particles can be used as a heat transfer medium in concentrated solar power plants to operate at higher temperature and achieve higher heat conversion efficiency than using the current solar Heat Transfer Fluids (HTF) that only work below 600 ◦C. Among various particle circulation concepts, the Dense Particle Suspension (DPS) flow in tubes, also called Upflow Bubbling Fluidized Bed (UBFB), was studied in the frame of the CSP2 FP7European project. The DPS capacity to extract heat from a tube absorber exposed to concentrated solar radiation was demonstrated and the first values of the tube wall-to-DPS heat transfer coefficient were measured. A stable outlet temperature of 750 ◦C was reached with a metallic tube, and a particle reflux in the near tube wall region was evidenced. In thispaper, the UBFB behavior is studied using the multiphase flow code NEPTUNE CFD. Hydrodynamics of SiC Geldart A-type particles and heat transfer imposed by a thermal flux at the wall are coupled in 3D unsteady numerical simulations. The convective/diffusive heat transfer between the gas and dispersed phase, and the inter-particle radiative transfer (Rosseland approximation) are accounted for. Simulations and experiments are compared here and the temperature influence on the DPS flow is analyzed.

Item Type: Article
Uncontrolled Keywords: particle solar receiver, gas-particle flow, heat transfer fluid, euler-euler model, 3D numerical simulation
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Applied Engineering & Management
Faculty of Engineering & Science > Wolfson Centre for Bulk Solids Handling Technology
Last Modified: 19 Nov 2018 10:10
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/20415

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