umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Torrefaction and Gasification of Hydrolysis Residue
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2008 (English)In: 16th European Biomass Conference and Exhibition: Proceedings, 2008Conference paper, Published paper (Other academic)
Abstract [en]

When producing ethanol from lignocellulosic material using hydrolysis combined with fermentation, a large amount of residue consisting of mainly lignin is generated. A significant amount of energy is retained in this residue which may be utilised as a measure for the process to become economically viable. One possibility is as fuel in a gasification process for synthesis gas production, improving the fuel yield and the overall plant efficiency. Furthermore, the pre-treatment method torrefaction has been shown to significantly improve biomass fuel characteristics such as energy density, moisture content, feeding and hydrophobic properties, as well as significantly facilitate particle size reduction. Therefore, the process chain from hydrolysis residue to synthesis gas was investigated and demonstrated in the present work through bench-scale experiments in a batch torrefaction reactor and a bubbling fluidised bed gasifier. The results from the torrefaction work confirmed the improved fuel characteristics and the effects of process variables were evaluated by factorial designed experiments. The torrefaction residence time was identified as the most influential variable. The results from reactivity tests and gasification experiments indicate that hydrolysis residue and corresponding torrefied residue are suitable for synthesis gas production, with some improved feedstock handling characteristics for the latter.

Place, publisher, year, edition, pages
2008.
Keyword [en]
gasification, enzymatic hydrolysis, bio-ethanol
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-92861OAI: oai:DiVA.org:umu-92861DiVA: diva2:744324
Conference
16th European Biomass Conference and Exhibition, Valencia, Spain, June 2-6, 2008
Available from: 2014-09-08 Created: 2014-09-08 Last updated: 2014-12-19
In thesis
1. Syngas production by integrating thermal conversion processes in an existing biorefinery
Open this publication in new window or tab >>Syngas production by integrating thermal conversion processes in an existing biorefinery
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The use of carbon from fossil-based resources result in changes in the earth’s climate due to emissions of greenhouse gases. Biomass is the only renewable source of carbon that may be converted to transportation fuels and chemicals, markets now fully dominated by traditional oil supply. The biorefinery concept for upgrading and refinement of biomass feedstocks to value-added end-products has the potential to mitigate greenhouse gas emissions and replace fossil products. Most biorefineries use biochemical conversion processes and may have by-product streams suitable as feedstocks for thermal conversion and production of syngas. Further synthesis to value-added products from the syngas could increase the product output from the biorefinery.

The application of thermal conversion processes integrated into an existing biorefinery concept has been evaluated in this licentiate thesis work. Two by-product streams; hydrolysis (lignin) residue from an ethanol plant and biogas from wastewater treatment, have been investigated as gasification/reforming feedstocks. Also, the pre-treatment method torrefaction has been evaluated for improved gasification fuel characteristics and integration aspects. A new process and system concept (Bio2Fuels) with potential carbon negative benefits has been suggested and evaluated as an alternative route for syngas production by separating biomass into a hydrogen rich gas and a carbon rich char product.

The evaluation demonstrated that hydrolysis residue proved a suitable feedstock for gasification with respect to syngas composition. Biogas can be further reformed to syngas by combined biomass gasification and methane reforming, with promising results on CH4 conversion rate and increased H2/CO ratio at temperatures ≥1000°C. The pre-treatment method torrefaction was demonstrated to improve fuel qualities and may thus significantly facilitate entrained flow gasification of biomass residue streams. Also, integration of a torrefaction plant at a biorefinery site could make use of excess heat for drying the raw material before torrefaction. The Bio2Fuels concept was evaluated and found feasible for further studies.

The application of thermal conversion processes into an existing biorefinery, making use of by-products and biomass residues as feedstocks, has significant potential for energy integration, increased product output as well as for climate change mitigation.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2014. 27 p.
Keyword
biorefinery, biofuels, syngas, gasification, torrefaction, methane reforming, H2/CO ratio, system analysis, CO2 negativity
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-92860 (URN)978-91-7601-101-0 (ISBN)
Presentation
2014-09-05, N460, Naturvetarhuset, Umeå Universitet, Umeå, 13:00 (Swedish)
Supervisors
Available from: 2014-12-19 Created: 2014-09-08 Last updated: 2014-12-19Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Håkansson, KatarinaOlofsson, IngemarNordin, Anders
By organisation
Department of Applied Physics and Electronics
Chemical Process Engineering

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 169 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf