Torrefaction of biomass
Stump biomass is energy rich and stump harvesting for use as fuel become more and more interesting in Sweden. Swedish Forest Agency (2009) has estimated that stump harvesting in Sweden would respond to an annual energy supply of 57 TWh/year. However, stump has not been recognized as a bioenergy r...
| Autor principal: | |
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| Formato: | Second cycle, A2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2011
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| Acceso en línea: | https://stud.epsilon.slu.se/3234/ |
| _version_ | 1855570541633601536 |
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| author | Luo, Xun |
| author_browse | Luo, Xun |
| author_facet | Luo, Xun |
| author_sort | Luo, Xun |
| collection | Epsilon Archive for Student Projects |
| description | Stump biomass is energy rich and stump harvesting for use as fuel become more and more
interesting in Sweden. Swedish Forest Agency (2009) has estimated that stump harvesting in
Sweden would respond to an annual energy supply of 57 TWh/year. However, stump has not
been recognized as a bioenergy resource in Sweden. Suitable methods for pre-treatment of
stump are probably of great importance to make it accepted as fuel. It is therefore rewarding
to carry out an investigation in this area for stump.
This report represents results from a diploma project, which was aimed to develop a fixed bed
reactor for experimental study of biomass torrefaction, followed by TG analysis and kinetic
modelling employing Ozawa method and different kinetic models including one-step and
three-pseudo-component models. The focus was on Norway spruce stump. Two other types of
biomass, poplar and fuel tree chips were also included in the study for comparison.
The study has demonstrated that fuel properties, including heating values and grindability of
the investigated biomasses, were improved by torrefaction. The heating rate affects the
thermal decomposition process. In addition, SEM analysis indicated that the wood surface
structure was broken and destroyed by torrefaction process. Activation energy of untreated
and torrefied biomass were determined, being in good agreement with data in the literature.
Among the kinetic models tested, three-pseudo-components model with reaction order n ≠ 1
appears to be the best for simulating pyrolysis of untreated and torrefied biomass. |
| format | Second cycle, A2E |
| id | RepoSLU3234 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2011 |
| publishDateSort | 2011 |
| record_format | eprints |
| spelling | RepoSLU32342012-10-06T15:42:26Z https://stud.epsilon.slu.se/3234/ Torrefaction of biomass Luo, Xun Processing of forest products Renewable energy resources Technology Stump biomass is energy rich and stump harvesting for use as fuel become more and more interesting in Sweden. Swedish Forest Agency (2009) has estimated that stump harvesting in Sweden would respond to an annual energy supply of 57 TWh/year. However, stump has not been recognized as a bioenergy resource in Sweden. Suitable methods for pre-treatment of stump are probably of great importance to make it accepted as fuel. It is therefore rewarding to carry out an investigation in this area for stump. This report represents results from a diploma project, which was aimed to develop a fixed bed reactor for experimental study of biomass torrefaction, followed by TG analysis and kinetic modelling employing Ozawa method and different kinetic models including one-step and three-pseudo-component models. The focus was on Norway spruce stump. Two other types of biomass, poplar and fuel tree chips were also included in the study for comparison. The study has demonstrated that fuel properties, including heating values and grindability of the investigated biomasses, were improved by torrefaction. The heating rate affects the thermal decomposition process. In addition, SEM analysis indicated that the wood surface structure was broken and destroyed by torrefaction process. Activation energy of untreated and torrefied biomass were determined, being in good agreement with data in the literature. Among the kinetic models tested, three-pseudo-components model with reaction order n ≠ 1 appears to be the best for simulating pyrolysis of untreated and torrefied biomass. 2011-09-12 Second cycle, A2E NonPeerReviewed application/pdf swe https://stud.epsilon.slu.se/3234/1/luo_x_110912.pdf Luo, Xun , 2011. Torrefaction of biomass : a comparative and kinetic study of thermal decomposition for Norway spruce stump, poplar and fuel tree chips. Second cycle, A2E. Uppsala: (NL, NJ) > Dept. of Energy and Technology <https://stud.epsilon.slu.se/view/divisions/OID-565.html> urn:nbn:se:slu:epsilon-s-609 eng |
| spellingShingle | Processing of forest products Renewable energy resources Technology Luo, Xun Torrefaction of biomass |
| title | Torrefaction of biomass |
| title_full | Torrefaction of biomass |
| title_fullStr | Torrefaction of biomass |
| title_full_unstemmed | Torrefaction of biomass |
| title_short | Torrefaction of biomass |
| title_sort | torrefaction of biomass |
| topic | Processing of forest products Renewable energy resources Technology |
| url | https://stud.epsilon.slu.se/3234/ https://stud.epsilon.slu.se/3234/ |