Gas-Solid Flow in a Fluidized-Particle Tubular Solar Receiver: Off-Sun Experimental Flow Regimes Characterization

Ronny Gueguen, Guillaume Sahuquet, Samuel Mer, Adrien Toutant, Françoise Bataille and Gilles Flamant
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Ronny Gueguen: Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, 7, Rue du Four Solaire, 66120 Font-Romeu, France
Guillaume Sahuquet: Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, 7, Rue du Four Solaire, 66120 Font-Romeu, France
Samuel Mer: PROMES-CNRS Laboratory, Engineering Science Department, University of Perpignan (UPVD), Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France
Adrien Toutant: PROMES-CNRS Laboratory, Engineering Science Department, University of Perpignan (UPVD), Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France
Françoise Bataille: PROMES-CNRS Laboratory, Engineering Science Department, University of Perpignan (UPVD), Tecnosud, Rambla de la Thermodynamique, 66100 Perpignan, France
Gilles Flamant: Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, 7, Rue du Four Solaire, 66120 Font-Romeu, France

Energies, 2021, vol. 14, issue 21, 1-25

Abstract: The fluidized particle-in-tube solar receiver concept is promoted as an attractive solution for heating particles at high temperature in the context of the next generation of solar power tower. Similar to most existing central solar receivers, the irradiated part of the system, the absorber, is composed of tubes in which circulate the fluidized particles. In this concept, the bottom tip of the tubes is immersed in a fluidized bed generated in a vessel named the dispenser. A secondary air injection, called aeration, is added at the bottom of the tube to stabilize the flow. Contrary to risers, the particle mass flow rate is controlled by a combination of the overpressure in the dispenser and the aeration air velocity in the tube. This is an originality of the system that justifies a specific study of the fluidization regimes in a wide range of operating parameters. Moreover, due to the high value of the aspect ratio, the particle flow structure varies along the tube. Experiments were conducted with Geldart Group A particles at ambient temperature with a 0.045 m internal diameter and 3 m long tube. Various temporal pressure signal processing methods, applied in the case of classical risers, are applied. Over a short acquisition time, a cross-reference of the results is necessary to identify and characterize the fluidization regimes. Bubbling, slugging, turbulent and fast fluidization regimes are encountered and the two operation modes, without and with particle circulation, are compared.

Keywords: fluidization regimes; dense particle suspension; particle-in-tube solar receivers; hydrodynamics of gas-solid flow; upward circulation; pressure signal processing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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