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Conference Papers Year : 2016

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

Abstract

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.
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Dates and versions

hal-01715386 , version 1 (22-02-2018)

Identifiers

  • HAL Id : hal-01715386 , version 1
  • OATAO : 19502

Cite

Hadrien Benoit, Renaud Ansart, Pablo García-Triñanes, Daniel Gauthier, Gilles Flamant, et al.. 3D numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating. 9th International Conference on Multiphase Flow (ICMF 2016), May 2016, Firenze, Italy. pp. 1-6. ⟨hal-01715386⟩
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