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Söderlind, Ulf
Publications (10 of 22) Show all publications
Liu, H., Chen, Y., Yang, H., Gentili, F., Söderlind, U., Wang, X., . . . Chen, H. (2020). Hydrothermal Treatment of High Ash Microalgae: Focusing on the Physicochemical and Combustion Properties of Hydrochars. Energy & Fuels, 34(2), 1929-1939
Open this publication in new window or tab >>Hydrothermal Treatment of High Ash Microalgae: Focusing on the Physicochemical and Combustion Properties of Hydrochars
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2020 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 34, no 2, p. 1929-1939Article in journal (Refereed) Published
Abstract [en]

Natural microalgae with high ash content are common in water environment. Converting them into biofuels not only meets the energy demands but also improves the aquatic environment. This study aims to explore the physicochemical properties and molecular structural features of hydrochars derived from hydrothermal treatment of natural microalgae. Meanwhile, the combustion behavior and kinetics analysis of hydrochars were also evaluated. The hydrothermal treatment was performed with natural microalgae and its acid-washing microalgae under different temperatures from 260 to 340 °C to reveal the effect of ash on hydrochars properties. The results indicate that the ash significantly influences the functional groups composition and physicochemical property of hydrochars. The yields of hydrochars derived from deashing microalgae are lower than those of hydrochars derived from natural microalgae. However, the relative content of the C-C/C-H/C=C groups representing hydrocarbon carbon in hydrochars derived from deashing microalgae is higher than that of hydrochars derived from natural microalgae. Both natural microalgae and deashing microalgae contain the protein-N and pyrrole-N, and natural microalgae also contain a small amount of inorganic-N. The Brunauer-Emmett-Teller (BET) surface areas of hydrochars derived from natural microalgae and deashing microalgae are in the range of 5.97-10.29 and 21.34-34.74 m2 g-1, respectively. The thermogravimetric analysis results show that hydrochars derived from deashing microalgae have better fuel quality in view of the comprehensive combustibility indexes compared with hydrochars derived from natural microalgae, which is conducive to their application to solid fuels. The acid-washing pretreatment can effectively improve the utilization of natural microalgae.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-38663 (URN)10.1021/acs.energyfuels.9b04093 (DOI)000518215400082 ()2-s2.0-85080910497 (Scopus ID)
Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-26Bibliographically approved
Liu, H., Chen, Y., Yang, H., Gentili, F. G., Söderlind, U., Wang, X., . . . Chen, H. (2019). Hydrothermal carbonization of natural microalgae containing a high ash content. Paper presented at 6th International Conference on Biomass Energy (ICBE), Wuhan, PEOPLES R CHINA, OCT 16-19, 2018. Fuel, 249, 441-448
Open this publication in new window or tab >>Hydrothermal carbonization of natural microalgae containing a high ash content
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2019 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 249, p. 441-448Article in journal (Refereed) Published
Abstract [en]

The potential to convert natural microalgae (Scenedesmus) into solid fuels by hydrothermal carbonization (HTC) was evaluated. The deashing microalgae (DA) were obtained by acid-washing natural microalgae (NM) with HCl. The deashing efficiency was high from 44.66% for NM to 14.45% for DA. HTC carried out at temperature in the range from 180 to 260 degrees C with this two types feedstock (i.e. NM and DA). The results showed that DA-derived hydrochars had good physicochemical and fuel properties compared with that of NM-derived hydrochars. HTC process of DA was mainly based on polymerization, and the hydrolysis process was short. The hydrochars obtained from DA at 220 degrees C (HC-D220) had the highest value of 51.86% with a carbon content and fixed carbon content 1.15 and 1.33 times, respectively, greater than that of DA. The high heating value (HHV) of HC-D220 reached 26.64 MJ/kg which is equivalent to medium-high calorific coal. The thermogravimetric analysis (TG) demonstrated that the hydrochars derived from DA have good combustion properties with stable at high temperature zones. They can easily mix with coal or replace coal in combustion application. The results of this study revealed that natural microalgae can be utilized by hydrothermal carbonization to generate renewable fuel resources.

Keywords
Hydrothermal carbonization, Natural microalgae, Ash, Energy recovery, Solid fuel
Identifiers
urn:nbn:se:miun:diva-36191 (URN)10.1016/j.fuel.2019.03.004 (DOI)000465255500044 ()2-s2.0-85063497017 (Scopus ID)
Conference
6th International Conference on Biomass Energy (ICBE), Wuhan, PEOPLES R CHINA, OCT 16-19, 2018
Available from: 2019-05-22 Created: 2019-05-22 Last updated: 2019-05-24Bibliographically approved
Göransson, K., Söderlind, U. & Zhang, W. (2018). Biogas production from biological methanation of syngas. In: European Biomass Conference and Exhibition Proceedings: . Paper presented at 26th European Biomass Conference and Exhibition -EUBCE 2018, Copenhagen, Denmark, 14-18 May 2018 (pp. 512-515). ETA-Florence Renewable Energies (26thEUBCE)
Open this publication in new window or tab >>Biogas production from biological methanation of syngas
2018 (English)In: European Biomass Conference and Exhibition Proceedings, ETA-Florence Renewable Energies , 2018, no 26thEUBCE, p. 512-515Conference paper, Published paper (Refereed)
Abstract [en]

Biogas to be used as gas vehicle fuel is a highly potential source to meet transport fuel demand and give a significant contribution to the Swedish target: vehicle fleet independent of fossil fuels by 2030. At present the biogas market is limited by the amount of available organic waste and the associated infrastructure. To overcome these issues, biomass could either be gasified into syngas and synthesized into bio-SNG (Synthetic Natural Gas) through catalytic methanation, or biomass gasification could be integrated into the biogas system to produce methane through biological methanation. Biomass gasification integrated in biological methanation is a relatively new idea and technology. Syngas conversion to methane by anaerobic cultures is practically unexplored, and few reports are available on this subject. Nevertheless, the pathway has been receiving intensive attractions and R&D recent years. For this purpose, a novel pathway by integrating biomass gasification into biogas system is studied in detail. This paper reviews the whole process from integration of biomass gasification into the biogas system to methane production through biological methanation: Biomass gasification > H2+CO > Biogas digester > Upgrading > Natural gas network. 

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2018
Keywords
Allothermal Gasification, Anaerobic Digestion, Synthetic Natural Gas (SNG), Thermochemical Conversion, Transport Sector
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-34568 (URN)2-s2.0-85051038909 (Scopus ID)
Conference
26th European Biomass Conference and Exhibition -EUBCE 2018, Copenhagen, Denmark, 14-18 May 2018
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved
Zhang, W., Henschel, T., Söderlind, U., Tran, K.-Q. & Han, X. (2017). Thermogravimetric and Online Gas Analysis on various Biomass Fuels. In: Energy Procedia: . Paper presented at 8th International Conference on Applied Energy, ICAE 2016, 8 October 2016 through 11 October 2016, Beijing; China (pp. 162-167). Elsevier, 105
Open this publication in new window or tab >>Thermogravimetric and Online Gas Analysis on various Biomass Fuels
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2017 (English)In: Energy Procedia, Elsevier, 2017, Vol. 105, p. 162-167Conference paper, Published paper (Refereed)
Abstract [en]

In this work, the biomass property is evaluated based on pyrolysis behavior of biomass fuels by means of TGA and online gas analysis. Wood, sawdust, pine bark, peat, straw, black liquor and microalgae are chosen as the biomass feedstocks for the pyrolysis study. The measurement results show high volatile content for algae and black liquor (around 85%) and low volatile content for pine bark and peat (around 69%). Differently from woody biomass, the DTG curve of straw has a single dominant peak at much lower temperature, which suggests a dominant component of hemicellulose in biomass, while algae and peat have a broader temperature specturm of devolatilization but much lower peak temperature. CO2 is released first and H2 later in the pyrolysis process for all biomass feedstocks, whileas the peak of CO formation follows CO2 formation trend for most feedstocks used, except for peat and pine bark which give a peak later at high temperature. This indicates secondary reactions of tar cracking, steam reforming and char gasification.

Place, publisher, year, edition, pages
Elsevier, 2017
Series
Energy Procedia
Keywords
biomass feedstock, fuel lexibility, pyrolysis, TGA
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-31367 (URN)10.1016/j.egypro.2017.03.296 (DOI)000404967900025 ()2-s2.0-85020739568 (Scopus ID)
Conference
8th International Conference on Applied Energy, ICAE 2016, 8 October 2016 through 11 October 2016, Beijing; China
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-12-08Bibliographically approved
Henschel, T., Söderlind, U. & Zhang, W. (2016). A study on the pyrolysis behaviour of different biomass fuels using thermogravimetry and online gas analysis. In: European Biomass Conference and Exhibition Proceedings: . Paper presented at European Biomass Conference and Exhibition (pp. 1290-1293). ETA-Florence Renewable Energies, 24thEUBCE(24thEUBCE)
Open this publication in new window or tab >>A study on the pyrolysis behaviour of different biomass fuels using thermogravimetry and online gas analysis
2016 (English)In: European Biomass Conference and Exhibition Proceedings, ETA-Florence Renewable Energies , 2016, Vol. 24thEUBCE, no 24thEUBCE, p. 1290-1293Conference paper, Published paper (Refereed)
Abstract [en]

Fuel availability and flexibility are important issues for biomass-based heat/power and advanced biofuel plants. The physical and chemical properties of biomass feedstocks vary from one to others to a great degree, which must be taken care of for the reactor design/operation, system optimization and blend feedstock application. In this work, the biomass property is evaluated based on pyrolysis behavior of biomass fuels by means of TGA and online gas analysis. Wood, pine bark, peat, straw, black liquor and microalgae are chosen as the biomass feedstocks for the pyrolysis study. The measurement results show high volatile content for algae and black liquor (around 85%) and low volatile content for pine bark and peat (around 69%). Differently from woody biomass, the DTG curve of straw has a single dominant peak at much lower temperature, which suggests a dominant component of hemicellulose in biomass, while algae and peat have a broader temperature specturm of devolatilization but much lower peak temperature. CO2 is released first and H2 later in the pyrolysis process for all biomass feedstocks, whileas the peak of CO formation follows CO2 formation trend for most feedstocks used, except for peat and pine bark which give a peak later at high temperature. This indicates secondary reactions of tar cracking, steam reforming and char gasification.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2016
Keywords
Biomass feedstock, Fuel lexibility, Pyrolysis, TGA
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-30993 (URN)2-s2.0-85019760282 (Scopus ID)
Conference
European Biomass Conference and Exhibition
Note

Export Date: 26 June 2017; Conference Paper; Correspondence Address: Zhang, W.; Department of Chemical Engineering/FSCN, Mid Sweden UniversitySweden; email: wennan.zhang@miun.se

Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-06-26Bibliographically approved
Göransson, K., Söderlind, U., Engstrand, P. & Zhang, W. (2015). An experimental study on catalytic bed materials in a biomass dual fluidised bed gasifier. Renewable energy, 81, 251-261
Open this publication in new window or tab >>An experimental study on catalytic bed materials in a biomass dual fluidised bed gasifier
2015 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 81, p. 251-261Article in journal (Refereed) Published
Abstract [en]

A study on in-bed material catalytic reforming of tar/CH4 has been performed in the 150 kW allothermal gasifier at Mid Sweden University (MIUN). The major challenge in biomass fluidised-bed gasification to produce high-quality syngas, is the reforming of tars and CH4. The MIUN gasifier has a unique design suitable for in-bed tar/CH4 catalytic reforming and continuously internal regeneration of the reactive bed material. This paper evaluates the catalytic effects of olivine and Fe-impregnated olivine (10%wtFe/olivine Catalyst) with reference to silica sand in the MIUN dual fluidised bed (DFB) gasifier. Furthermore, a comparative experimental test is carried out with the same operation condition and bed-materials when the gasifier is operated in the mode of single bubbling fluidised bed (BFB), in order to detect the internal regeneration of the catalytic bed materials in the DFB operation. The behaviour of catalytic and non-catalytic bed materials differs when they are used in the DFB and the BFB. Fe/olivine and olivine in the BFB mode give lower tar and CH4 content together with higher H-2 + CO concentration, and higher H-2/CO ratio, compared to DFB mode. It is hard to show a clear advantage of Fe/olivine over olivine regarding tar/CH4 catalytic reforming. (C) 2015 Elsevier Ltd. All rights reserved.

Keywords
Biomass gasification, Tar reforming, Catalytic bed material, Dual fluidised bed
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-25638 (URN)10.1016/j.renene.2015.03.020 (DOI)000355359900025 ()2-s2.0-84936949072 (Scopus ID)
Available from: 2015-08-28 Created: 2015-08-18 Last updated: 2017-12-04Bibliographically approved
Göransson, K., Söderlind, U., Henschel, T., Engstrand, P. & Zhang, W. (2015). Internal tar/CH4 reforming in a biomass dual fluidised bed gasifier.. Biomass Conversion and Biorefinery, 5, 355-366
Open this publication in new window or tab >>Internal tar/CHreforming in a biomass dual fluidised bed gasifier.
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2015 (English)In: Biomass Conversion and Biorefinery, ISSN 2190-6815, Vol. 5, p. 355-366Article in journal (Refereed) Published
Abstract [en]

An internal reformer is developed for in situ catalyticreforming of tar and methane (CH4) in allothermal gasifiers.The study has been performed in the 150 kW dual fluidised bed (DFB) biomass gasifier at Mid Sweden University(MIUN). The MIUN gasifier is built for research onsynthetic fuel production. Reduction of tars and CH4 (exceptfor methanation application) in the syngas is a major challengefor commercialization of biomass fluidised-bed gasificationtechnology towards automotive fuel production. The MIUN gasifier has a unique design with an internal reformer, where intensive contact of gas and catalytic solids improves the reforming reactions. This paper presents an initial study on the internal reformer operated with and without Ni-catalytic pellets, by evaluation of the syngas composition and tar/CH4 content. A novel application of Ni-catalyst in DFB gasifiers is proposed and studied in this work. It can be concluded that the reformer with Ni-catalytic pellets clearly gives a higher H2 content together with lower CH4 and tar contents in the syngas than the reformer without Ni-catalytic pellets. The gravimetric tar content decreases down to 5 g/m3 and the CH4 content down below 6 % in the syngas. The tar content can be decreased further to lower levels, with increased gas contact to the specific surface area of the catalyst and increased catalyst surface-to-volume ratio. The new design in the MIUN gasifier increases the gasification efficiency, suppresses the tar generation and upgrades the syngas quality.

Keywords
Biomass gasification, Syngas cleaning, Tar removal, Tar/CH4 reformning, Dual fluidised bed, Ni-catalyst
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-23247 (URN)10.1007/s13399-014-0151-5 (DOI)2-s2.0-84978026015 (Scopus ID)
Note

Published online 2nd Oct 2014.

Available from: 2014-10-17 Created: 2014-10-17 Last updated: 2016-09-22Bibliographically approved
Göransson, K., Söderlind, U. & Zhang, W. (2014). CATALYTIC REDUCTION OF TAR/CH4 BY AN INTERNAL REFORMER IN A DFB GASIFIER. In: European Biomass Conference & Exhibition Proceedings: . Paper presented at 22nd EU BC&E 2014 – Hamburg, Germany 23-26 June 2014 (pp. 620-625).
Open this publication in new window or tab >>CATALYTIC REDUCTION OF TAR/CH4 BY AN INTERNAL REFORMER IN A DFB GASIFIER
2014 (English)In: European Biomass Conference & Exhibition Proceedings, 2014, p. 620-625Conference paper, Published paper (Other academic)
Abstract [en]

An internal reformer is developed for in-situ catalytic reforming of tar and methane (CH4) in allothermal gasifiers. Reduction of tars and CH4 in the syngas is a challenge for commercialization of biomass fluidised-bed gasification technology towards advanced automotive fuel production. This paper presents an initial study on the internal reformer operated with and without Ni-catalytic pellets in the Mid Sweden University (MIUN) DFB (Dual Fluidised Bed) gasifier, by evaluation of the syngas composition and tar/CH4 content. The novelty with the application of Ni-catalyst in this paper is the selected location where intensive gas to catalytic-material and bed-material contacts improve the reforming reactions. It can be concluded that the reformer with Ni-catalytic pellets clearly gives a higher H2 content together with lower CH4 and tar contents in the syngas than the reformer without Ni-catalytic pellets. The gravimetric tar content decreases down to 5 g/m3 and the CH4 content down below 6% in the syngas. The tar content will be decreased further to lower levels, with increased gas contact to the specific surface area of the catalyst and increased catalyst surface-to-volume ratio. The new design in the MIUN gasifier increases the gasification efficiency, suppresses the tar generation and upgrades the syngas quality.  

Keywords
Biomass Gasification, Syngas Cleaning, Tar Reduction, Methane Reforming, Tar-cracking Catalyst, Dual Fluidised Bed
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-23248 (URN)10.5071/22ndEUBCE2014-2AV.2.13 (DOI)000351053500114 ()978-88-89407-52-3 (ISBN)
Conference
22nd EU BC&E 2014 – Hamburg, Germany 23-26 June 2014
Projects
Bioenergy - gasification
Available from: 2014-10-17 Created: 2014-10-17 Last updated: 2016-12-16Bibliographically approved
Göransson, K., Söderlind, U., Henschel, T., Engstrand, P. & Zhang, W. (2014). Internal tar/CH4 reforming in a biomass dual fluidised bed gasifier. In: Proceeding of 4th International Symposium on Gasification and its Applications: . Paper presented at iSGA-4 (4th International Symposium on Gasification and its Applications), Wienna, Austria 2-5 Sept 2014.
Open this publication in new window or tab >>Internal tar/CH4 reforming in a biomass dual fluidised bed gasifier
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2014 (English)In: Proceeding of 4th International Symposium on Gasification and its Applications, 2014Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

An internal reformer is developed for in-situ catalytic reforming of tar and methane (CH4) in allothermal gasifiers. The study has been performed in the 150 kW dual fluidised bed (DFB) biomass gasifier at Mid Sweden University (MIUN). The MIUN gasifier is built for research on synthetic fuel production. Reduction of tars and CH4 (except for methanation application) in the syngas is a major challenge for commercialization of biomass fluidised-bed gasification technology towards automotive fuel production. The MIUN gasifier has a unique design with an internal reformer, where intensive contact of gas and catalytic solids improves the reforming reactions. This paper presents a study on the internal reformer operated with and without Ni-catalytic pellets, by evaluation of the syngas composition and tar/CH4 content. It can be concluded that the reformer with Ni-catalytic pellets clearly gives a higher H2 content together with lower CH4 and tar contents in the syngas than the reformer without Ni-catalytic pellets. The gravimetric tar content decreases down to 5 g/m3 and the CH4 content down below 6% in the syngas. The novel design in the MIUN gasifier increases the gasification efficiency, suppresses the tar generation and upgrades the syngas quality

Keywords
Biomass Gasification, Syngas Cleaning, Tar Removal, Tar/CH4 Reforming, Dual Fluidised Bed, Ni-catalyst
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-23249 (URN)
Conference
iSGA-4 (4th International Symposium on Gasification and its Applications), Wienna, Austria 2-5 Sept 2014
Available from: 2014-10-17 Created: 2014-10-17 Last updated: 2014-10-17Bibliographically approved
Göransson, K., Söderlind, U. & Zhang, W. (2013). Internal Tar/CH4 Reforming using a Novel Design in a Biomass Dual Fluidised Bed Gasifier. In: 21st European Biomass Conference and Exhibition: Setting the course for a biobased ecomomy. Paper presented at 21st European Biomass Conference and Exhibition (pp. 2038-2042). Florence, Italy: ETA-Florence Renewable Energies
Open this publication in new window or tab >>Internal Tar/CH4 Reforming using a Novel Design in a Biomass Dual Fluidised Bed Gasifier
2013 (English)In: 21st European Biomass Conference and Exhibition: Setting the course for a biobased ecomomy, Florence, Italy: ETA-Florence Renewable Energies , 2013, p. 2038-2042Conference paper, Published paper (Other academic)
Abstract [en]

Reforming of tars and methane (CH4) in syngas is a significant challenge for low-temperature biomass gasification. For a dual fluidised bed gasifier (DFBG), catalytic bed materials are usually used to promote the reforming reactions. Intensive contact between gas and catalytic bed material at high temperature enhances the internal tar/CH4 reforming. The MIUN gasifier, built for research into synthetic fuel production, is a dual fluidised bed gasifier (DFBG). The results with different bed materials (silica sand, olivine and Fe-impregnated olivine) give roughly equivalent amounts of methane and gravimetric tar in the raw untreated syngas, and need to be reduced to an acceptably low level. The gasification research group at MIUN investigates a novel design in the MIUN gasifier, to increase the gasification efficiency, suppress the tar generation and to upgrade the syngas quality. The first step is taken towards a novel design in the MIUN gasifier. The application is expected to significantly enhance the syngas quality.

Place, publisher, year, edition, pages
Florence, Italy: ETA-Florence Renewable Energies, 2013
Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819
Keywords
Biomass Gasification, Syngas Cleaning, Tar Removal, Methane Reforming, Dual Fluidised Bed
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-20031 (URN)978-88-89407-53-0 (ISBN)
Conference
21st European Biomass Conference and Exhibition
Projects
FORE-subproject, Gasification-based Biorefinery for Mechanical Pulp Mills
Available from: 2013-10-21 Created: 2013-10-21 Last updated: 2013-10-28Bibliographically approved
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