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Insights into the catalytic CO₂ methanation of a boiling water cooled fixed-bed reactor: Simulation-based analysis

Gruber, Manuel; Wiedmann, Denis; Haas, Manuel; Harth, Stefan; Loukou, Alexandra; Trimis, Dimosthenis

Abstract:
This article presents the simulation-based analysis of experimental results from a catalytic fixed-bed reactor for the methanation of CO2. During previously published experiments, temperature profiles inside bidisperse catalyst-silicon carbide fixed-beds were gathered and reactant conversions at the reactor outlet measured. On the basis of the temperature profiles along the fixed-bed length and outlet reactant conversions, a procedure for the numerical characterisation of these results was developed. Primary parameters like the inserted multipoint thermocouple and the heat transfer coefficient between reactor wall and surrounding boiling water cooling are systematically investigated. Concerning the binary bidisperse fixed-beds of porous catalyst cylinders and highly thermal conductive silicon carbide, a simple numerical method for the determination of the effective heat conductivity of the bed is presented. The modelling of effective reaction rates within an industrial sized catalyst and reactor is a non-trivial task, due to interlinking aspects like intrinsic reaction rate and internal and external transport limitations. Intrinsic reaction rate, internal and external transport limitations are linked, what makes a separate investigation challenging. ... mehr



Originalveröffentlichung
DOI: 10.1016/j.cej.2020.126788
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 1385-8947
KITopen-ID: 1000124380
Erschienen in The chemical engineering journal
Seiten 126788
Schlagwörter Power-to-Gas; Power-to-SNG; CO₂ methanation; fixed-bed reactor; HELMETH
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