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Research Papers

On-Sun Performance Evaluation of Alternative High-Temperature Falling Particle Receiver Designs

[+] Author and Article Information
Clifford K. Ho, Joshua M. Christian, Julius E. Yellowhair, Kenneth Armijo, William J. Kolb

Sandia National Laboratories,
P.O. Box 5800, MS-1127,
Albuquerque, NM 87185-1127

Sheldon Jeter, Matthew Golob, Clayton Nguyen

Georgia Institute of Technology,
771 Ferst Drive,
Atlanta, GA 30332

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 29, 2018; final manuscript received July 23, 2018; published online September 14, 2018. Assoc. Editor: Marc Röger.

J. Sol. Energy Eng 141(1), 011009 (Sep 14, 2018) (7 pages) Paper No: SOL-18-1044; doi: 10.1115/1.4041100 History: Received January 29, 2018; Revised July 23, 2018

This paper evaluates the on-sun performance of a 1 MW falling particle receiver. Two particle receiver designs were investigated: obstructed flow particle receiver versus free-falling particle receiver. The intent of the tests was to investigate the impact of particle mass flow rate, irradiance, and particle temperature on the particle temperature rise and thermal efficiency of the receiver for each design. Results indicate that the obstructed flow design increased the residence time of the particles in the concentrated flux, thereby increasing the particle temperature and thermal efficiency for a given mass flow rate. The obstructions, a staggered array of chevron-shaped mesh structures, also provided more stability to the falling particles, which were prone to instabilities caused by convective currents in the free-fall design. Challenges encountered during the tests included nonuniform mass flow rates, wind impacts, and oxidation/deterioration of the mesh structures. Alternative materials, designs, and methods are presented to overcome these challenges.

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References

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Figures

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Fig. 1

Test structure for falling particle receiver system

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Fig. 2

Cutaway illustration of free-falling (left) and obstructed-flow (right) particle receiver designs

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Fig. 3

Image showing particles flowing downward through and around chevron-shaped mesh structures

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Fig. 4

Images of on-sun testing of the particle receiver at the national solar thermal test facility

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Fig. 5

Measured increase in particle temperature versus average irradiance for the obstructed-flow receiver design. Error bars represent one standard deviation.

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Fig. 6

Measured thermal efficiency versus average irradiance for the obstructed-flow receiver design. Error bars represent one standard deviation.

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Fig. 7

Measured increase in particle temperature versus average irradiance for the free-fall receiver design. Error bars represent one standard deviation.

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Fig. 8

Measured thermal efficiency versus average irradiance for the free-fall receiver design. Error bars represent one standard deviation.

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Fig. 9

Measured slot aperture after on-sun testing and heating for two different plates (both initially 6.35 mm aperture) heated to different temperatures

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Fig. 10

Finite element simulation of heated stainless steel 316 discharge plate (700 °C) confined along the bottom edges, resulting in buckling and narrowing of the aperture

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Fig. 11

Change in aperture during tests of stainless-steel 316 discharge plate with initial 6.35 mm slot aperture

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Fig. 12

Deteriorated mesh structure (top) and SEM image of oxidized wire mesh with sintered particles

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