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Warm Plasma Application in Tar Conversion and Syngas Valorization: The Fate of Hydrogen Sulfide

Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, 27 Wybrzeze St. Wyspianskiego, 50-370 Wroclaw, Poland
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Academic Editors: Adam Smoliński and Dino Musmarra
Energies 2021, 14(21), 7383; https://doi.org/10.3390/en14217383
Received: 17 August 2021 / Revised: 12 October 2021 / Accepted: 28 October 2021 / Published: 5 November 2021
(This article belongs to the Special Issue Combustion and Gasification of Solid Fuels)
Warm plasma techniques are considered a promising method of tar removal in biomass-derived syngas. The fate of another problematic syngas impurity—hydrogen sulfide—is studied in this work. It is revealed that processing simulated syngas with a microwave plasma results in hydrogen sulfide conversion. For different gas flow rates (20–40 NLPM) and hydrogen sulfide concentrations ranging from 250 ppm to 750 ppm, the conversion rate varies from ca. 26% to 45%. The main sulfur-containing products are carbon disulfide (ca. 30% of total sulfur) and carbonyl sulfide (ca. 8% of total sulfur). Besides them, significantly smaller quantities of sulfates and benzothiophene are also detected. The main components of syngas have a tremendous impact on the fate of hydrogen sulfide. While the presence of carbon monoxide, methane, carbon dioxide, and tar surrogate (toluene) leads to the formation of carbonyl sulfide, carbon disulfide, sulfur dioxide, and benzothiophene, respectively, the abundance of hydrogen results in the recreation of hydrogen sulfide. Consequently, the presence of hydrogen in the simulated syngas is the main factor that determines the low conversion rate of hydrogen sulfide. Conversion of hydrogen sulfide into various sulfur compounds might be problematic in the context of syngas purification and the application of the right technique for sulfur removal. View Full-Text
Keywords: biomass gasification; microwave plasma; sulfur compounds biomass gasification; microwave plasma; sulfur compounds
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MDPI and ACS Style

Wnukowski, M.; Moroń, W. Warm Plasma Application in Tar Conversion and Syngas Valorization: The Fate of Hydrogen Sulfide. Energies 2021, 14, 7383. https://doi.org/10.3390/en14217383

AMA Style

Wnukowski M, Moroń W. Warm Plasma Application in Tar Conversion and Syngas Valorization: The Fate of Hydrogen Sulfide. Energies. 2021; 14(21):7383. https://doi.org/10.3390/en14217383

Chicago/Turabian Style

Wnukowski, Mateusz, and Wojciech Moroń. 2021. "Warm Plasma Application in Tar Conversion and Syngas Valorization: The Fate of Hydrogen Sulfide" Energies 14, no. 21: 7383. https://doi.org/10.3390/en14217383

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