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RESEARCH PAPERS

Double-Walled Reactor Tube with Molten Salt Thermal Storage for Solar Tubular Reformers

[+] Author and Article Information
Tsuyoshi Hatamachi

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

Tatsuya Kodama

Department of Chemistry & Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japantkodama@eng.niigata-u.ac.jp

Yuki Isobe, Daisuke Nakano, Nobuyuki Gokon

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

J. Sol. Energy Eng 128(2), 134-138 (Apr 08, 2005) (5 pages) doi:10.1115/1.2183803 History: Received April 05, 2005; Revised April 08, 2005

This paper proposes a novel-type of “double-walled” reactor tube with molten-salt thermal storage at high temperatures for use in solar tubular reformers. The prototype reactor tube is demonstrated on the heat-discharge and chemical reaction performances during cooling mode of the reactor tube at laboratory scale. The Na2CO3 composite material with MgO ceramics was filled into the outer annulus of the double-walled reactor tube while the Ru-based catalyst particles were filled into the inner tube. The heat discharge form the molten Na2CO3 circumvented the rapid temperature change of the catalyst bed, which resulted in the alleviation of decrease in chemical conversion during cooling mode of the reactor tube. The application of the new reactor tubes to solar tubular reformers is expected to help realize stable operation of the solar reforming process under fluctuating insolation during a cloud passage.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup for CO2 reforming by the double-walled reactor tube with the Na2CO3 composite material

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Figure 2

Equilibrium composition of major components and methane conversion for the system CH4+3CO2 at 1atm as a function of temperature

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Figure 3

Temperature profile of the alumina-ball bed in the inner tube of the double-walled reactor with/without the Na2CO3 composite material during cooling mode of the heat-discharge test

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Figure 4

Space velocity (GHSV) dependence of the alumina-ball bed temperature in the inner tube of the double-walled reactor with/without the Na2CO3 composite material after 30min of cooling in the heat-discharge test

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Figure 5

Time variations of methane conversion and catalyst bed temperature for the double-walled reactor tube with/without the Na2CO3 composite material during cooling mode of the reforming performance test. The solid line for the reactor with the Na2CO3 composite and the dashed line for that without Na2CO3 composite.

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Figure 6

Space velocity (GHSV) dependence of methane conversion by the double-walled reactor tube with/without the Na2CO3 composite material after 30min of cooling in the reforming performance test

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Figure 7

High conversion (>90%) reforming period of time, prolonged by the double-walled reactor tube with the Na2CO3 composite for various space velocities (GHSV)

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Figure 8

The Na2CO3 composite material, broken after the reforming performance tests

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