Performance improvement of a micro-structured gas separator utilizing the Soret effect

Takeshi Kyoda; Takumi Saiki; Sohei Matsumoto; Shinya Watanabe; Naoki Ono

doi:10.1299/jtst.21-00271

Performance improvement of a micro-structured gas separator utilizing the Soret effect

Takeshi Kyoda, Takumi Saiki, Sohei Matsumoto, Shinya Watanabe, Naoki Ono

Research output: Contribution to journal › Article › peer-review

Abstract

The Soret effect is a phenomenon in which the components of mixed fluids are separated by a temperature gradient. This study investigated a simple and low-cost technique for extracting high concentration hydrogen (H₂) by utilizing the Soret effect in a H₂–carbon dioxide mixed gas. Previous research by the authors attempted to improve the efficiency of H₂ separation by applying a temperature difference to a network of separators with a continuous structure (the Burgers cascade) and enabling a mixed gas throughflow. One of the problems in that study was the impairment in separation performance that occurred due to the remixing of the components separated by flows within the device cells. Therefore, to resolve this problem, the present study conducted numerical simulations for gas flow, temperature distribution, and H₂ concentration and studied the effect of inserting an additional structure (a partition) to prevent gas remixing at first. Based on the simulation results, experiments were conducted using the Burgers cascade in a device with partitioned cells. The results confirmed that the partitions improved the separation of H₂ by up to about 1.6 times compared with conventional devices.

Original language	English
Article number	21-00271
Journal	Journal of Thermal Science and Technology
Volume	17
Issue number	1
DOIs	https://doi.org/10.1299/jtst.21-00271
Publication status	Published - 2022

Keywords

Gas separation
Hydrogen
Network device
Partition
Soret effect
Thermal diffusion

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Instrumentation
Engineering (miscellaneous)

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10.1299/jtst.21-00271

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title = "Performance improvement of a micro-structured gas separator utilizing the Soret effect",

abstract = "The Soret effect is a phenomenon in which the components of mixed fluids are separated by a temperature gradient. This study investigated a simple and low-cost technique for extracting high concentration hydrogen (H2) by utilizing the Soret effect in a H2–carbon dioxide mixed gas. Previous research by the authors attempted to improve the efficiency of H2 separation by applying a temperature difference to a network of separators with a continuous structure (the Burgers cascade) and enabling a mixed gas throughflow. One of the problems in that study was the impairment in separation performance that occurred due to the remixing of the components separated by flows within the device cells. Therefore, to resolve this problem, the present study conducted numerical simulations for gas flow, temperature distribution, and H2 concentration and studied the effect of inserting an additional structure (a partition) to prevent gas remixing at first. Based on the simulation results, experiments were conducted using the Burgers cascade in a device with partitioned cells. The results confirmed that the partitions improved the separation of H2 by up to about 1.6 times compared with conventional devices.",

keywords = "Gas separation, Hydrogen, Network device, Partition, Soret effect, Thermal diffusion",

author = "Takeshi Kyoda and Takumi Saiki and Sohei Matsumoto and Shinya Watanabe and Naoki Ono",

note = "Funding Information: This work was supported in part by the Japan Science and Technology Agency under the Adaptable and Seamless Technology transfer Program through Target?driven R & D (A?STEP) (#VP301180 6 6587.) The authors are grateful to the research fund. Funding Information: This work was supported in part by the Japan Science and Technology Agency under the Adaptable and Seamless Technology transfer Program through Target-driven R & D (A-STEP) (#VP301180 6 6587.) The authors are grateful to the research fund. Publisher Copyright: {\textcopyright} 2022 The Japan Society of Mechanical Engineers.",

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AU - Saiki, Takumi

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AU - Watanabe, Shinya

AU - Ono, Naoki

N1 - Funding Information: This work was supported in part by the Japan Science and Technology Agency under the Adaptable and Seamless Technology transfer Program through Target?driven R & D (A?STEP) (#VP301180 6 6587.) The authors are grateful to the research fund. Funding Information: This work was supported in part by the Japan Science and Technology Agency under the Adaptable and Seamless Technology transfer Program through Target-driven R & D (A-STEP) (#VP301180 6 6587.) The authors are grateful to the research fund. Publisher Copyright: © 2022 The Japan Society of Mechanical Engineers.

PY - 2022

Y1 - 2022

N2 - The Soret effect is a phenomenon in which the components of mixed fluids are separated by a temperature gradient. This study investigated a simple and low-cost technique for extracting high concentration hydrogen (H2) by utilizing the Soret effect in a H2–carbon dioxide mixed gas. Previous research by the authors attempted to improve the efficiency of H2 separation by applying a temperature difference to a network of separators with a continuous structure (the Burgers cascade) and enabling a mixed gas throughflow. One of the problems in that study was the impairment in separation performance that occurred due to the remixing of the components separated by flows within the device cells. Therefore, to resolve this problem, the present study conducted numerical simulations for gas flow, temperature distribution, and H2 concentration and studied the effect of inserting an additional structure (a partition) to prevent gas remixing at first. Based on the simulation results, experiments were conducted using the Burgers cascade in a device with partitioned cells. The results confirmed that the partitions improved the separation of H2 by up to about 1.6 times compared with conventional devices.

AB - The Soret effect is a phenomenon in which the components of mixed fluids are separated by a temperature gradient. This study investigated a simple and low-cost technique for extracting high concentration hydrogen (H2) by utilizing the Soret effect in a H2–carbon dioxide mixed gas. Previous research by the authors attempted to improve the efficiency of H2 separation by applying a temperature difference to a network of separators with a continuous structure (the Burgers cascade) and enabling a mixed gas throughflow. One of the problems in that study was the impairment in separation performance that occurred due to the remixing of the components separated by flows within the device cells. Therefore, to resolve this problem, the present study conducted numerical simulations for gas flow, temperature distribution, and H2 concentration and studied the effect of inserting an additional structure (a partition) to prevent gas remixing at first. Based on the simulation results, experiments were conducted using the Burgers cascade in a device with partitioned cells. The results confirmed that the partitions improved the separation of H2 by up to about 1.6 times compared with conventional devices.

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Performance improvement of a micro-structured gas separator utilizing the Soret effect

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Keywords

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