Research Papers

Fluidized Bed Technology for Concentrating Solar Power With Thermal Energy Storage

[+] Author and Article Information
Zhiwen Ma

National Renewable Energy Laboratory,
Concentrating Solar Power Program,
15013 Denver West Parkway, MS RSF033,
Golden, CO 80401
e-mail: zhiwen.ma@nrel.gov

Greg Glatzmaier

National Renewable Energy Laboratory,
Concentrating Solar Power Program,
15013 Denver West Parkway, MS RSF033,
Golden, CO 80401
e-mail: Greg.Glatzmaier@nrel.gov

Mark Mehos

National Renewable Energy Laboratory,
Concentrating Solar Power Program,
15013 Denver West Parkway, MS RSF033,
Golden, CO 80401
e-mail: Mark.Mehos@nrel.gov

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received June 21, 2012; final manuscript received March 10, 2014; published online May 2, 2014. Editor: Gilles Flamant.

J. Sol. Energy Eng 136(3), 031014 (May 02, 2014) (9 pages) Paper No: SOL-12-1161; doi: 10.1115/1.4027262 History: Received June 21, 2012; Revised March 10, 2014

A generalized modeling method is introduced and used to evaluate thermal energy storage (TES) performance. The method describes TES performance metrics in terms of three efficiencies: first-law efficiency, second-law efficiency, and storage effectiveness. By capturing all efficiencies in a systematic way, various TES technologies can be compared on an equal footing before more detailed simulations of the components and concentrating solar power (CSP) system are performed. The generalized performance metrics are applied to the particle-TES concept in a novel CSP thermal system design. The CSP thermal system has an integrated particle receiver and fluidized-bed heat exchanger, which uses gas/solid two-phase flow as the heat-transfer fluid, and solid particles as the heat carrier and storage medium. The TES method can potentially achieve high temperatures (>800 °C) and high thermal efficiency economically.

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Grahic Jump Location
Fig. 3

Indirect and direct integration of TES in a CSP system

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Fig. 4

FB-CSP system with TES

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Fig. 2

Thermal energy storage options for CSP technologies

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Fig. 1

TES to smooth and shift CSP power generation [3]

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Fig. 5

Comparison of liquid and solid particle containment insulations. (a) Natural convection heat loss in a liquid storage tank. (b) Self-insulation layer formed in the particle storage system.

Grahic Jump Location
Fig. 6

Particle-TES position in a FB-CSP system



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