Book/Dissertation / PhD Thesis

FZJ-2022-05277

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evaluation von Reaktorkonzepten für die CO2-basierte Methanolsynthese aus Wasserstoff und Kohlendioxid mithilfe von CFD-Simulationen

Weiske, S. (Corresponding author)FZJ*

2022
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-661-8

Please use a persistent id in citations: http://hdl.handle.net/2128/33222  urn:nbn:de:0001-2023013148

Abstract: The abatement of the anthropogenic climate change and dependency on fossile energy carriers are two of the greatest challenges, which mankind has to overcome in the current century. The approach of utilization of as much as possible renewable sources for a sustainable energy supply holds many challenges for the established supply structures as well. Especially the temporal and local balance of renewable energies seems to be an important obstacle in the terms of the energy transition. Synthetic fuels can contribute to this balance by providing renewable energies to the transport sector via the concept of sector coupling. Methanol prevails to be in a key role, whether utilized as an alternative fuel or as base chemical for the production of advanced alternative fuels. The topic of this PhD-thesis is to analyze different pathways for the renewable production of methanol. The focus of this analysis is set to the developed reactor concepts. A study of potential reactors evaluates the different concepts from a point of view of the synthesis process. In this study CFD-models will be developed to perform detailed analyses with changing boundary conditions. The CFD-models of the reactors have to combine different aspects in the modeling process. In terms of modeling the reaction kinetics of the CO2-based methanol synthesis three Langmuir-Hinshelwood models are selected: Graaf [1], Bussche and Froment [2] and by Seidel et al. [3]. The mass transport is modeled by the concept of catalyst efficiencies. The model by Graaf [1] is selected to be used in further studies, because it shows the best agreement with the experimental data from an industrial reactor and and the prediction of the chosen reference case seems to be the most reasonable. The frame of this potential study includes simulations of quasi-isothermal tube reactors like the Lurgi-type reactor, the Mitsubishi-Superconverter und an innovative membrane reactor. The quench reactor is integrated in this study as well. Tailormade optimization strategies are applied to the diverse reactor concepts, which show the intrinsic advantages of the reactor concepts to optimize the production of methanol. Furthermore, fluid dynamic analyses are used to determine the potential of application of fluidized bed and slurry bubble coloumn reactors in methanol synthesis processes. In the end the membrane reactor shows the greatest potential to overcome the challenges of CO2-based methanol synthesis by an in-situ capture of water

Note: Dissertation, RWTH Aachen University, 2022

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2022

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