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

Benoit, Hadrien and Ansart, Renaud and García-Triñanes, Pablo and Gauthier, Daniel and Flamant, Gilles and Simonin, Olivier 3D numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating. (2016) In: 9th International Conference on Multiphase Flow (ICMF 2016), 22 May 2016 - 27 May 2016 (Firenze, Italy).

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Current solar Heat Transfer Fluids (HTF) only work below 600°C. We proposed to use air-fluidized Dense Particle Suspensions (DPS), also called Upflow Bubbling Fluidized Bed (UBFB), in tubes as a new HTF and storage medium in the frame of the so-called CSP2 FP7 European project. UBFB can operate up to the solid sintering temperature (1400 °C for SiC particles), thus improving the plant efficiency and cost of produced kWh. 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 this paper, 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 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. The temperature influence on the DPS flow is analyzed.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to the ICMF. This paper appears in Proceedings of the 9th International Conference on Multiphase Flow (ICMF 2016).
HAL Id:hal-01715386
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Perpignan Via Domitia - UPVD (FRANCE)
Other partners > University of Surrey (UNITED KINGDOM)
Laboratory name:
European Commission
Deposited On:02 Feb 2018 08:58

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