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Thermal Engineering

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01-07-2022 | HEAT AND MASS TRANSFER AND PROPERTIES OF WORKING FLUIDS AND MATERIALS

Numerical Investigation into the Effectiveness of Internal Finning of a Flow-Type Metal-Hydride Reactor for Purifying Hydrogen of Impurities

Authors: M. D. Nashchekin, K. B. Minko

Published in: Thermal Engineering | Issue 7/2022

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Abstract—

Among the directions of alternative energy development is the use of hydrogen as an energy carrier. At present, the worldwide production of relatively pure hydrogen by water electrolysis does not exceed 5%. Other methods of hydrogen production are accompanied by its contamination with impurities. At the same time, fuel cells and turbine-cooling systems, and engines require high-purity hydrogen. One of the promising and safe methods of hydrogen purification is based on its selective absorption during filtration through a layer of metal hydride. This article presents the results of a numerical study of heat- and mass-transfer processes in a flow-through metal hydride reactor for hydrogen purification with internal finning in the “active” volume (the volume of the sorption layer). To enhance heat transfer from the metal hydride bed to the cooled or heated reactor walls, radial fins made of various metals are used. Internal finning options and the effect of external cooling conditions on heat- and mass-transfer processes in the reactor are analyzed. The sensitivity of the simulation results to the accuracy of determining the parameters of the mathematical model is checked. It has been demonstrated that internal finning and proper selection of the external cooling conditions can considerably improve the performance of the metal-hydride system for storage and purification of hydrogen. A conclusion has been made that the density of the fins (the number of fins) and the thermal conductivity of the fin material have a noticeable effect on the efficiency of a flow reactor only when certain values of the heat-transfer coefficient to the coolant are attained on the reactor wall surface.

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Title: Numerical Investigation into the Effectiveness of Internal Finning of a Flow-Type Metal-Hydride Reactor for Purifying Hydrogen of Impurities
Authors: M. D. Nashchekin
K. B. Minko
Publication date: 01-07-2022
Publisher: Pleiades Publishing
Published in: Thermal Engineering / Issue 7/2022
Print ISSN: 0040-6015
Electronic ISSN: 1555-6301
DOI: https://doi.org/10.1134/S0040601522070059

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