Heat transfer to a catalytic multiphase dehydrogenation reactor

Willer M, Preuster P, Malgaretti P, Harting J, Wasserscheid P (2024)

Publication Type: Journal article

Publication year: 2024

Journal

International Journal of Hydrogen Energy Elsevier

Book Volume: 80

Pages Range: 1011-1020

DOI: 10.1016/j.ijhydene.2024.07.073

Abstract

The release of hydrogen from liquid organic hydrogen carriers (LOHC) takes place in an endothermal dehydrogenation reaction that is accompanied by a strong volume expansion. This leads to complex hydrodynamic properties that change drastically along the reactor axis due to product gas evolution. Consequently, heat transfer into the catalytic fixed-bed exhibits a pronounced local dependency. For a better understanding of such multiphase dehydrogenation systems, we have performed heat transport measurements in the presence of the chemical reaction, namely during the dehydrogenation of perhydro benzyltoluene (H12-BT) and perhydro dibenzyltoluene (H18-DBT). The results reveal that overall heat transfer coefficients show a clear local dependency on the axial coordinate. Moreover, the two carriers were found to differ significantly in their thermal behavior. Based on a global analysis, two main regimes can be distinguished in the dehydrogenation reactor: 1.) With the LOHC mixture being primarily in the liquid phase, heat transport is dominated and intensified by the hydrogen release; 2.) With an increasing proportion of LOHC vapor in the reactor, the heat transport is dominated by the gas phase, resulting in significantly lower thermal parameters.

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Technische Hochschule Rosenheim DE Germany (DE)

How to cite

APA:

Willer, M., Preuster, P., Malgaretti, P., Harting, J., & Wasserscheid, P. (2024). Heat transfer to a catalytic multiphase dehydrogenation reactor. International Journal of Hydrogen Energy, 80, 1011-1020. https://doi.org/10.1016/j.ijhydene.2024.07.073

MLA:

Willer, Miriam, et al. "Heat transfer to a catalytic multiphase dehydrogenation reactor." International Journal of Hydrogen Energy 80 (2024): 1011-1020.

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