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Towards negative carbon emissions: Carbon capture in bio-syngas from gasification by aqueous pentaethylenehexamine
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
Umeå University, Sweden.
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2020 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 279, article id 115877Article in journal (Refereed) Published
Abstract [en]

In this work, an aqueous pentaethylenehexamine (PEHA) solution was studied for CO2 removal from bio-syngas for the first time. Firstly, pure CO2 absorption in aqueous PEHA solution under different conditions was conducted, and 20 wt% PEHA solution was identified as the best option. Secondly, the capture of CO2 was tested with synthetic syngas from a gas cylinder, and the species other than CO2 showed a negligible impact on CO2 removal. Finally, to evaluate the practical feasibility of using aqueous PEHA solution on the downstream CO2 capture, the pilot experiments of gasification with boreal forest-based biomasses were designed to provide real syngas with a realistic distribution in composition for further testing. The results showed that the operating conditions and the type of feedstocks affected the distribution in the bio-syngas composition. Among these feedstocks, at the optimal oxygen supply, using spruce needles generated the highest yields of CO and H2 and, meanwhile, gave rise to similar yields of other gases such as CO2, CH4, etc. The influence of the species other than CO2 for CO2 removal was negligible. Additionally, aqueous PEHA solution was tested as a biomass pretreatment agent, showing that no significant changes could be identified by the ultimate analysis (except for increased nitrogen content), but the yields of CO were affected negatively. On the other hand, when using the pretreated biomass by the aqueous PEHA solution, the NH3 concentration in bio-syngas reached to the highest (4000 parts per million), which slightly affected the CO2 absorption capacity and initial absorption rate of 20 wt% PEHA solution in a positive way.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 279, article id 115877
Keywords [en]
Bio-syngas, Biomass pre-treatment, CO2 removal, Gasification, Negative carbon emission, Pentaethylenehexamine
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-48925DOI: 10.1016/j.apenergy.2020.115877Scopus ID: 2-s2.0-85091345059OAI: oai:DiVA.org:ri-48925DiVA, id: diva2:1476061
Note

Funding details: Energimyndigheten; Funding details: Energimyndigheten, P40548-1; Funding text 1: The Bio4Energy program and Kempe Foundations are acknowledged. This work is also a part of the activities of the Åbo Akademi University Johan Gadolin Process Chemistry Centre . This work is also supported by the Swedish Energy Agency (Energimyndigheten) ( P40548-1 ).

Available from: 2020-10-13 Created: 2020-10-13 Last updated: 2023-05-16Bibliographically approved

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Weiland, Fredrik

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