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

2005 ◽  
Vol 128 (2) ◽  
pp. 134-138 ◽  
Author(s):  
Tsuyoshi Hatamachi ◽  
Tatsuya Kodama ◽  
Yuki Isobe ◽  
Daisuke Nakano ◽  
Nobuyuki Gokon
Keyword(s):  
Composite Material ◽  
Molten Salt ◽  
Temperature Change ◽  
Chemical Reaction ◽  
Thermal Storage ◽  
Chemical Conversion ◽  
Stable Operation ◽  
Cooling Mode ◽  
Outer Annulus ◽  
Rapid Temperature

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.

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

Solar Energy ◽  
2005 ◽  
Author(s):  
T. Hatamachi ◽  
T. Kodama ◽  
Y. Isobe ◽  
D. Nakano ◽  
N. Goukon
Keyword(s):  
Composite Material ◽  
Molten Salt ◽  
Temperature Change ◽  
Chemical Reaction ◽  
Thermal Storage ◽  
Chemical Conversion ◽  
Stable Operation ◽  
Cooling Mode ◽  
Outer Annulus ◽  
Rapid Temperature

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.

Molten-Salt Tubular Absorber/Reformer (MoSTAR) Project: The Thermal Storage Media of Na2CO3–MgO Composite Materials

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Tatsuya Kodama ◽  
Nobuyuki Gokon ◽  
Shin-ichi Inuta ◽  
Shingo Yamashita ◽  
Taebeom Seo
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Molten Salt ◽  
Chemical Reaction ◽  
Thermal Power ◽  
Thermal Storage ◽  
Dry Reforming Of Methane ◽  
Stable Operation ◽  
Discharge Mode ◽  
Storage Media

The molten-salt tubular absorber/reformer (MoSTAR) project aims to develop a novel type of “double-walled” tubular absorber/reformer with molten-salt thermal storage at high temperature for use in solar natural-gas reforming and solar air receiver, and to demonstrate its performances on the sun with a 5 kWt dish-type solar concentrator. The new concept of double-walled reactor tubes is proposed for use in a solar reformer by Niigata University, Japan, and involves packing a molten/ceramic composite material in the annular region between the internal catalyst tube and the exterior solar absorber wall. This solar tubular absorber concept may be also applied to solar air receiver for solar thermal power generation. The MoSTAR project includes the development of molten-salt thermal storage media, the new design and the fabrication of absorber/reformer with the double-walled absorber tubes, and finally the solar demonstration on the 5 kWt dish concentrator of Inha University in Korea. In this paper, thermal storage media of the series of Na2CO3–MgO composite materials were tested in a double-walled reformer tube with a thermal storage capacity of about 0.3 kWh. The chemical reaction performances for dry reforming of methane during cooling or heat-discharge mode of the reactor tube were investigated using an electric furnace. The experimental results obtained under feed gas mixture of CH4/CO2=1:3 at a residence time of 0.3 s and at 1 atm showed that the single reactor tube with 90 wt % Na2CO3/10 wt % MgO composite material successfully maintained a high methane conversion above 90% with about 0.9 kW reforming scale based on high heating value during 45 min of the heat-discharge mode. The chemical reaction performances of the reactor tube were investigated also for the solar-simulating operation mode. 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.

Carbonate Composite Catalyst with High-Temperature Thermal Storage for Use in Solar Tubular Reformers

2004 ◽  
Vol 127 (3) ◽  
pp. 396-400 ◽  
Author(s):  
Tsuyoshi Hatamachi ◽  
Tatsuya Kodama ◽  
Yuuki Isobe
Keyword(s):  
High Temperature ◽  
Thermal Storage ◽  
Chemical Conversion ◽  
High Heat ◽  
Composite Catalyst ◽  
Stable Operation ◽  
Cooling Mode ◽  
Co2 Reforming ◽  
High Heat Capacity ◽  
Laboratory Scale Reactor

The composite materials of Ni-applied, porous zirconia balls with molten Na2CO3 salt were examined for use in solar thermochemical reforming of methane as the catalyst with high-temperature thermal storage. The millimeter-sized composite balls were tested on the heat discharge property and the catalytic activity for CO2 reforming of methane in a laboratory-scale reactor. The high heat capacity and large latent heat (heat of solidification) of the composite molten salt circumvented the temperature dropping of the catalyst bed, which resulted in the alleviation of rapid decay in chemical conversion during cooling mode of the reactor. The composite catalyst is expected to realize stable operation in the solar reformer under fluctuation of insolation by a cloud passage.

Carbonate Composite Catalyst With High-Temperature Thermal Storage for Use in Solar Tubular Reformers

Solar Energy ◽  
2004 ◽  
Author(s):  
Tsuyoshi Hatamachi ◽  
Tatsuya Kodama ◽  
Yuuki Isobe
Keyword(s):  
High Temperature ◽  
Thermal Storage ◽  
Chemical Conversion ◽  
High Heat ◽  
Composite Catalyst ◽  
Stable Operation ◽  
Cooling Mode ◽  
Co2 Reforming ◽  
High Heat Capacity ◽  
Laboratory Scale Reactor

The composite materials of Ni-applied, porous zirconia balls with molten Na2CO3 salt were examined for use in solar thermochemical reforming of methane as the catalyst with high-temperature thermal storage. The millimeter-sized composite balls were tested on the heat discharge property and the catalytic activity for CO2 reforming of methane in a laboratory-scale reactor. The high heat capacity and large latent heat (heat of solidification) of the composite molten salt circumvented the temperature dropping of the catalyst bed, which resulted in the alleviation of rapid decay in chemical conversion during cooling mode of the reactor. The composite catalyst is expected to realize stable operation in the solar reformer under fluctuation of insolation by a cloud passage.

Bulk Transition Elements Based Materials for Magnetic Cooling Application

2011 ◽  
Vol 170 ◽  
pp. 248-252 ◽  
Author(s):  
Mohamed Balli ◽  
Osmann Sari ◽  
L. Zamni ◽  
A. Robert ◽  
J. Forchelet ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Composite Material ◽  
Powder Metallurgy ◽  
Magnetocaloric Effect ◽  
Temperature Change ◽  
Room Temperature ◽  
Test Bench ◽  
Transition Elements ◽  
Magnetic Systems ◽  
Magnetic Cooling

In this paper we investigate the performances of two bulk magnetocaloric refrigerants based on La(Fe,Co)13-xSix and prepared by powder metallurgy. Both materials were developed especially for a magnetic cooling machine. We have determined the magnetocaloric effect in term of temperature change under magnetic field using a test-bench with practical running conditions. ΔT was measured under 2 T and close to room temperature range. The obtained results will be compared with those of some reference materials reported in the literature. In addition, a composite material based on La(Fe,Co)13-xSix is proposed for magnetic systems using Ericsson and AMR cycles for refrigeration close to room temperature.

Comparison of Two-Tank Indirect Thermal Storage Designs for Solar Parabolic Trough Power Plants

2009 ◽  
Author(s):  
Joseph Kopp ◽  
R. F. Boehm
Keyword(s):  
Power Generation ◽  
Molten Salt ◽  
Heat Exchangers ◽  
Power Plants ◽  
Thermal Storage ◽  
Heat Transfer Fluid ◽  
Base Case ◽  
Parabolic Trough ◽  
Trade Offs ◽  
Solar Field

The performance of a solar thermal parabolic trough plant with thermal storage is dependent upon the arrangement of the heat exchangers that ultimately transfer energy from the sun into steam. An indirect two-tank molten salt storage system that only transfers heat with the solar field heat transfer fluid is the most commercially acceptable thermal storage design. Annual electricity generation from two differing indirect two-tank molten salt storage designs and a base case with no thermal storage were modeled. Four components were characterized in a quasi-steady state analysis dependent upon key ambient and operational parameters: solar field, storage, heat exchangers, and power block. The parameters for the collector field remained constant for all models and were based on the SEGS VI plant. The results of net power generation favor storage though the design that maximizes annual output depends on whether maximum power generation or power generation during the evening peak demand hours is desired. Additionally, the economic trade offs are discussed for the three arrangements.

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