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Thermochemical behavior of pretreated biomass
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Mankind has to provide a sustainable alternative to its energy related problems. Bioenergy is considered as one of the potential renewable energy resources and as a result bioenergy market is also expected to grow dramatically in future. However, logistic issues are of serious concern while considering biomass as an alternative to fossil fuel. It can be improved by introducing pretreated wood pellet.

The main objective of this thesis is to address thermochemical behaviour of steam exploded pretreated biomass. Additionally, process aspects of torrefaction were also considered in this thesis. Steam explosion (SE) was performed in a laboratory scale reactor using Salix wood chips. Afterwards, fuel and thermochemical aspects of SE residue were investigated. It was found that Steam explosion pretreatment improved both fuel and pellet quality. Pyrolysis of SE residue reveals that alerted biomass composition significantly affects its pyrolysis behaviour. Contribution from depolymerized components (hemicellulose, cellulose and lignin) of biomass was observed explicitly during pyrolysis. When devolatilization experiment was performed on pellet produced from SE residue, effect of those altered components was observed. In summary, pretreated biomass fuel characteristics is significantly different in comparison with untreated biomass. On the other hand, Process efficiency of torrefaction was found to be governed by the choice of appropriate operating conditions and the type of biomass.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , vi, 56 p.
Keyword [en]
Biomass, Pretreatment, therochemical conversion, pyrolysis, combustion
National Category
Chemical Process Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-53060ISBN: 978-91-7501-228-5 (print)OAI: oai:DiVA.org:kth-53060DiVA: diva2:468772
Presentation
2012-01-26, B2, Brinellvägen 23, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
StandUp
Note
QC 20120110Available from: 2012-01-10 Created: 2011-12-21 Last updated: 2012-01-19Bibliographically approved
List of papers
1. Steam pretreatment of Salix to upgrade biomass fuel for wood pellet production
Open this publication in new window or tab >>Steam pretreatment of Salix to upgrade biomass fuel for wood pellet production
2011 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 92, no 9, 1711-1717 p.Article in journal (Refereed) Published
Abstract [en]

Steam explosion (SE) pretreatment is served to separate the main components of woody biomass. In general there is a noticeable gap in literature in terms of application of steam explosion process to upgrade biomass fuel for wood pellet production. In order to study the influence of steam explosion pretreatment on biomass fuel, Salix wood chips was used as raw material. Four different SE experiments were performed by varying two key process factors; time and temperature. Elementary quality and ash properties of the pretreated residue were investigated. Moreover, physical and thermochemical properties of the pellet, produced from the residue, were also investigated. Reduction in ash content especially in alkali metals was observed in steam treated residue. Pretreatment of biomass also enhanced carbon content and reduced oxygen amount in the fuel which enhanced the heating value of the fuel. Moreover, pretreatment enhanced pellet density, impact resistance, and abrasive resistance of pellet. However, small degradation in ash fusion characteristics and char reactivity was also observed as the severity of the process increased.

Keyword
Steam explosion, Pretreatment, Pellet, Combustion, Pyrolysis, Upgraded biomass fuel
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-37136 (URN)10.1016/j.fuproc.2011.04.017 (DOI)000292672900006 ()2-s2.0-79958151973 (Scopus ID)
Note
QC 20110802Available from: 2011-08-02 Created: 2011-08-02 Last updated: 2017-12-08Bibliographically approved
2. Change of pyrolysis characteristics and structure of woody biomass due to steam explosion pretreatment
Open this publication in new window or tab >>Change of pyrolysis characteristics and structure of woody biomass due to steam explosion pretreatment
2011 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 92, no 10, 1849-1854 p.Article in journal (Refereed) Published
Abstract [en]

Steam explosion (SE) pretreatment has been implemented for the production of wood pellet. This paper investigated changes in biomass structure due to implication of steam explosion process by its pyrolysis behavior/characteristics. Salix wood chip was treated by SE at different pretreatment conditions, and then pyrolysis characteristic was examined by thermogravimetric analyzer (TGA) at heating rate of 10 K/min. Both pyrolysis characteristics and structure of biomass were altered due to SE pretreatment. Hemicellulose decomposition region shifted to low temperature range due to the depolymerization caused by SE pretreatment. The peak intensities of cellulose decreased at mild pretreatment condition while they increased at severe conditions. Lignin reactivity also increased due to SE pretreatment. However, severe pretreatment condition resulted in reduction of lignin reactivity due to condensation and re-polymerization reaction. In summary, higher pretreatment temperature provided more active biomass compared with milder pretreatment conditions.

Keyword
Steam explosion, Woody biomass, Pyrolysis, Reactivity, Thermogravimetry
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-39003 (URN)10.1016/j.fuproc.2011.04.038 (DOI)000293932600006 ()2-s2.0-79960564430 (Scopus ID)
Available from: 2011-09-07 Created: 2011-09-06 Last updated: 2017-12-08Bibliographically approved
3. Devolatilization characteristics of steam explosion pretreated wood pellet
Open this publication in new window or tab >>Devolatilization characteristics of steam explosion pretreated wood pellet
(English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188Article in journal (Other academic) Submitted
Keyword
steam explosion, woody biomass, devolatilization, ignition
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-59068 (URN)
Note
QS 2012Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2017-12-08Bibliographically approved

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