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Research Papers

Face-Down Solid Particle Receiver Using Recirculation

[+] Author and Article Information
Marc Röger1

German Aerospace Center (DLR), Solar Research, Plataforma Solar de Almería, 04200 Tabernas, Spainmarc.roeger@dlr.de

Lars Amsbeck, Birgit Gobereit, Reiner Buck

German Aerospace Center (DLR), Solar Research, 70569 Stuttgart, Germany

1

Corresponding author.

J. Sol. Energy Eng 133(3), 031009 (Jul 25, 2011) (8 pages) doi:10.1115/1.4004269 History: Received January 23, 2011; Revised April 19, 2011; Published July 25, 2011; Online July 25, 2011

Solar thermal energy generation needs receiver technologies which can drive highly efficient turbines and decouple the collection of energy from its use by an economic storage technology. High-temperature solid particle receivers for solar tower systems with particle storage are one option. Important issues regarding high-temperature particle receivers are minimization of convective losses, no particle loss due to susceptibility to wind, and high efficiency also in part-load operation. A design approach facing these challenges is the face-down receiver using recirculation of particles. A screening performance analysis studying different recirculation patterns is presented. Using smart recirculation schemes, high receiver efficiencies can be maintained also at part-load operation (100% load ∼90%; 50% load ∼86%; 20% load ∼67%). Simulations of the face-down geometry yield total annual solar-to-electric efficiencies of 24% using a surround field. From the analyses, it can be concluded that solid particle receivers using smart recirculation patterns are a viable receiver option for storage and high-temperature high-efficiency turbine processes.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The face-down receiver design (a) and plan of its surround heliostat field colored by annual heliostat efficiency, latitude 34.5 deg N (b)

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Figure 5

Recirculation patterns to increase mean particle temperature from 300 °C to ∼800 °C under different loads with the face-down geometry. The number in the curtain is the mean solar flux incident on the curtain (N, north; E, east; S, south; W, west).

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Figure 4

Thermal efficiency of the face-down receiver design for different loads and recirculation patterns

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Figure 3

Energy balance across fluid volumes kAv and kBv , Eqs. 2,3

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Figure 2

Energy balance across surfaces kA and kB, Eq. 1, radiation exchange model

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