Kinetic modeling of a combined tar removal and methanation reactor for biogenous synthesis gas at medium temperature conditions

Fraubaum, Michaela; Walter, Heimo; Zuber, Christian

doi:10.1016/j.fuproc.2015.06.003

Cited by 5 publications

(1 citation statement)

References 33 publications

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“…The cooled fluidized-bed reactor was based on the Comflux process and adapted by the Paul-Scherrer-Institute (PSI) . Other biomass-to-SNG research projects are carried out, exemplarily, by the Energy Research Center of The Netherlands (ECN), TU Munich (TUM), agnion, TU Graz, or TU Vienna . The RFCS projects CO 2 freeSNG and CO 2 freeSNG2.0 at Friedrich-Alexander-University Erlangen–Nuremberg aim for similar decentralized concepts with lignite as fuel. , Further research activities focus on new approaches for temperature control of methanation reactors (e.g., thermo-oil cooled reactors at Deutsches Biomasseforschungszentrum (DBFZ) or flexible recycle ratio).…”

Section: State-of-the-artmentioning

confidence: 99%

Simulation-Based Evaluation of a Two-Stage Small-Scale Methanation Unit for Decentralized Applications

Neubert

Widzgowski

Rönsch³

et al. 2017

Energy Fuels

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The present work aims for a simulation-based evaluation of a two-stage methanation unit for the production of substitute natural gas (SNG) in decentralized small-scale applications with low complexity. Equilibrium calculations reveal a remarkable impact of CO 2 removal efficiency on final SNG composition with an optimum removal efficiency of 85% for the examined synthesis gas. The first methanation stage consists of a polytropic fixed-bed methanation reactor and is implemented as a one-dimensional pseudohomogeneous model in Aspen Plus TM with reaction kinetics from literature. The comparison of three different kinetic models reveals that reverse reaction of CO methanation has to be considered in the kinetic rate equations for appropriate modeling within a dynamic temperature range above 400 °C in case of polytropic reactors. The first methanation stage is examined with one kinetic model in terms of reactor geometry, varying GHSV and influence of the feed gas composition to determine limits in upscaling and avoidance of too high temperatures. A significant decrease of the reactor diameter favors the heat removal in case of polytropic reactor concept, whereas a higher GHSV causes higher outlet temperatures. The results show that an effective operation of the proposed methanation concept is limited by an appropriate heat removal.

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