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SOLAR ENERGY R&D IN ASIA

Internally Circulating Fluidized Bed Reactor Using m-ZrO2 Supported NiFe2O4 Particles for Thermochemical Two-Step Water Splitting

[+] Author and Article Information
Nobuyuki Gokon1

Center for Transdisciplinary Research, Niigata University, Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japanngokon@eng.niigata-u.ac.jp

Hiroki Yamamoto, Nobuyuki Kondo

Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan

Tatsuya Kodama

Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan

1

Corresponding author.

J. Sol. Energy Eng 132(2), 021102 (Apr 29, 2010) (10 pages) doi:10.1115/1.4001154 History: Received December 18, 2008; Revised August 17, 2009; Published April 29, 2010; Online April 29, 2010

A windowed internally circulating fluidized bed reactor was tested using m-ZrO2-supported NiFe2O4(NiFe2O4/m-ZrO2) particles as redox material for thermochemical two-step water splitting to produce hydrogen from water. The internally circulating fluidized bed of NiFe2O4/m-ZrO2 particles is directly heated by solar-simulated Xe light irradiation through a transparent quartz window mounted on top of the reactor. A sun simulator with three Xe lamps at laboratory scale has been newly installed in our laboratory for testing the fluidized bed reactor. The input power of incident Xe light can be scaled up to 2.6kWth. Temperature distributions within the fluidized bed are measured under concentrated Xe light irradiation with an input power of 2.6kWth. Hydrogen productivity and reactivity for the fluidized bed of NiFe2O4/m-ZrO2 particles are examined using two different reactors under the N2 flow rate and flow ratio, which yield a higher bed temperature. The feasibility of successive two-step water splitting using the fluidized bed reactor is examined by switching from N2 gas flow in the thermal reduction step to a steam/N2 gas mixture in the water decomposition step. It is confirmed that hydrogen production takes place in the single fluidized bed reactor by successive two-step water splitting.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematics of internally circulated fluidized bed reactor with quartz cyclone

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Figure 2

Photograph of internally circulating fluidized bed reactor irradiated using the sun simulator

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Figure 3

Experimental setup of fixed-bed reactor for water decomposition step of two-step water splitting

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Figure 4

Experimental set-up of successive two-step water splitting by internally circulating fluidized bed reactor

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Figure 5

Energy flux density of the incident solar-simulated light with three Xe lamps on the irradiated surface of the bed. The dotted circle shows an inside diameter of the reactor tube (45 mm).

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Figure 6

Temperature distribution of fluidized bed at flow ratio r=0.5 and total flow rate (a) Ftotal=2 dm3 min−1, (b) Ftotal=3 dm3 min−1 and (c) Ftotal=5 dm3 min−1.

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Figure 7

Photographs of fluidized particles of NiFe2O4/m-ZrO2 before and after solar-simulated Xe light irradiation: (a) before irradiation and after irradiation at (b) Ftotal=2 dm3 min−1 and (c) Ftotal=3 dm3 min−1.

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Figure 8

Time variations of bed surface temperature inside internal tube region and outer annulus region at flow ratio r=0.5 and at total flow rate (a) Ftotal=2 dm3 min−1 and (b) Ftotal=3 dm3 min−1

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Figure 9

Temperature distribution of fluidized bed at total flow rate Ftotal=3 dm3 min−1 at flow ratio (a) r=1, (b) r=0.5, and (c) r=0.33

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Figure 10

XRD patterns of (a) original NiFe2O4/m-ZrO2 particles and the powder material obtained after irradiation and (b) that obtained after W-D step

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Figure 11

Production rate of hydrogen released from the fluidized bed reactor during the W-D step of successive two-step water splitting

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