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Parametric Study on the Adjustability of the Syngas Composition by Sorption-Enhanced Gasification in a Dual-Fluidized Bed Pilot Plant

Author

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  • Selina Hafner

    (Institute of Combustion and Power Plant Technology (IFK), University of Stuttgart, Pfaffenwaldring 23, D-70569 Stuttgart, Germany)

  • Max Schmid

    (Institute of Combustion and Power Plant Technology (IFK), University of Stuttgart, Pfaffenwaldring 23, D-70569 Stuttgart, Germany)

  • Günter Scheffknecht

    (Institute of Combustion and Power Plant Technology (IFK), University of Stuttgart, Pfaffenwaldring 23, D-70569 Stuttgart, Germany)

Abstract

Finding a way for mitigating climate change is one of the main challenges of our generation. Sorption-enhanced gasification (SEG) is a process by which syngas as an important intermediate for the synthesis of e.g., dimethyl ether (DME), bio-synthetic natural gas (SNG) and Fischer–Tropsch (FT) products or hydrogen can be produced by using biomass as feedstock. It can, therefore, contribute to a replacement for fossil fuels to reduce greenhouse gas (GHG) emissions. SEG is an indirect gasification process that is operated in a dual-fluidized bed (DFB) reactor. By the use of a CO 2 -active sorbent as bed material, CO 2 that is produced during gasification is directly captured. The resulting enhancement of the water–gas shift reaction enables the production of a syngas with high hydrogen content and adjustable H 2 /CO/CO 2 -ratio. Tests were conducted in a 200 kW DFB pilot-scale facility under industrially relevant conditions to analyze the influence of gasification temperature, steam to carbon (S/C) ratio and weight hourly space velocity (WHSV) on the syngas production, using wood pellets as feedstock and limestone as bed material. Results revealed a strong dependency of the syngas composition on the gasification temperature in terms of permanent gases, light hydrocarbons and tars. Also, S/C ratio and WHSV are parameters that can contribute to adjusting the syngas properties in such a way that it is optimized for a specific downstream synthesis process.

Suggested Citation

  • Selina Hafner & Max Schmid & Günter Scheffknecht, 2021. "Parametric Study on the Adjustability of the Syngas Composition by Sorption-Enhanced Gasification in a Dual-Fluidized Bed Pilot Plant," Energies, MDPI, vol. 14(2), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:399-:d:479242
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    References listed on IDEAS

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    4. Reinhard Rauch & Jitka Hrbek & Hermann Hofbauer, 2014. "Biomass gasification for synthesis gas production and applications of the syngas," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 3(4), pages 343-362, July.
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    Cited by:

    1. Pitkäoja, Antti & Ritvanen, Jouni, 2023. "Simulation of sorption-enhanced gasification: H2O staging to a circulating fluidised bed gasifier to tailor the producer gas composition," Energy, Elsevier, vol. 266(C).
    2. Pitkäoja, Antti & Ritvanen, Jouni, 2022. "Sorption-enhanced gasification - Analysis of process parameters impact on the system's operation with a dual fluidised bed model," Energy, Elsevier, vol. 244(PB).

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