Moving Bed Heat Exchangers for Use With Heat Storage in Concentrating Solar Plants: A Multiphase Model

Heat storage based on particulate materials is a promising option to provide a demand-oriented electricity production with utility-scale solar power plants. For energy storage discharge, a moving bed heat exchanger is considered and its design is investigated. As a basis for a flexible design tool, a multiphase model based on the Eulerian continuum approach was set up to describe the bulk flow and the thermal performance. The model was applied to an example heat exchanger layout, and the simulation results were compared with an empirical model, confirming the validity of the approach. Initial parameter variations identify the key parameters and their effect on the thermal performance.

[1]  Peter Schwarzbözl,et al.  Improvement of ceramic absorber material for open volumetric receivers , 2011 .

[2]  J. Kuipers,et al.  Numerical calculation of wall‐to‐bed heat‐transfer coefficients in gas‐fluidized beds , 1992 .

[3]  V. Swaaij,et al.  Hydrodynamic modeling of dense gas-fluidised beds using the kinetic theory of granular flow: effect of coefficient of restitution on bed dynamics , 2000 .

[4]  M. Syamlal,et al.  MFIX documentation theory guide , 1993 .

[5]  J. Niegsch,et al.  Heat transfer and flow of bulk solids in a moving bed , 1994 .

[6]  Roberto Zenit,et al.  Dense granular flow around an immersed cylinder , 2003 .

[7]  D. Gidaspow,et al.  A bubbling fluidization model using kinetic theory of granular flow , 1990 .

[8]  Paul‐Michael Weinspach,et al.  Schüttgutbewegung und Wärmetransport im Wanderbett – Teil 1 , 1997 .

[9]  D. Gunn.  Transfer of heat or mass to particles in fixed and fluidised beds , 1978 .

[10]  K. Stephen,et al.  Wärmeübertragung n Festbetten, druchmischten Schüttgütern und Wirbelschichten. Von E.-U. Schlünder und E. Tsotsas. Georg Thieme Verlag, Stuttgart– New York 1988. XII, 259 S., 161 Abb., 33 Tab., kart., DM 58 , 1989 .

[11]  Rudolf Ernst,et al.  Der Mechanismus des Wrmeberganges an Wrmeaustauschern in Fliebetten (Wirbelschichten) , 1959 .

[12]  Ernst-Ulrich Schlünder,et al.  Wärmeübergang an bewegte Kugelschüttungen bei kurzfristigem Kontakt , 1971 .

[13]  Robert Pitz-Paal,et al.  Direct absorption receivers for high temperatures , 2011 .

[14]  P. Zehner,et al.  Wärmeleitfähigkeit von Schüttungen bei mäßigen Temperaturen , 1970 .