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Characterization of Particulate Matter from a Circulating Fluidized Bed Gasifier Using Different Types of Biomass
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This study characterized the particulate matter (PM) formed during gasification of different types of biomass in a circulating fluidized bed gasifier at atmospheric pressure. Two systems were used to sample the PM, and both on- and offline analysis techniques were used to characterize the PM. Four different instruments were used to measure the particle mass size distribution and concentration in the size range 0.01–30 µm. The agreement between the instruments was good, and the particle mass size distributions upstream of any cleaning device were bimodal, dominated by the coarse mode (>0.5 µm). The particle mass concentration of the fine mode (<0.5 µm) varied, depending on which biomass was used. The variation in particle mass concentration of the coarse mode was less, and was due to different loads of bed material and various ash contents in the biomass. The morphological analysis of the PM showed that the char content was low and that the PM was dominated by ash and bed material. The coarse-mode PM was rich in magnesium and calcium, while potassium and chlorine were prevalent in the fine-mode PM. The elementary composition of the PM varied between the different types of biomass used and heavy metals, that is, zinc and lead, were detected in low concentrations when using demolition wood as fuel.

Keywords [en]
Biomass gasification, particulate matter
National Category
Industrial Biotechnology
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:lnu:diva-11264OAI: oai:DiVA.org:lnu-11264DiVA, id: diva2:406909
Available from: 2011-03-29 Created: 2011-03-29 Last updated: 2016-01-11Bibliographically approved
In thesis
1. Characterization of particulate matter from atmospheric fluidized bed biomass gasifiers
Open this publication in new window or tab >>Characterization of particulate matter from atmospheric fluidized bed biomass gasifiers
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Through biomass gasification, biomass can be converted at high temperature to a product gas rich in carbon monoxide, hydrogen, and methane. After cleaning and upgrading, the product gas can be converted to biofuels such as hydrogen; methanol; dimethyl ether; and synthetic diesel, gasoline, and natural gas. Particulate matter (PM) is formed as a contaminant in the gasification process, and the aim of this work was to develop and apply a method for sampling and characterization of PM in the hot product gas.

 

A particle measurement system consisting of a dilution probe combined in series with a bed of granular activated carbon for tar adsorption was developed, with the aim of extracting a sample of the hot product gas without changing the size distribution and composition of the PM. The mass size distribution and concentration, as well as the morphology and elementary composition, of PM in the size range 10 nm to 10 µm in the product gas from a bubbling fluidized bed (BFB) gasifier, a circulating fluidized bed (CFB) gasifier and an indirect BFB gasifier using various types of biomass as fuel were determined.

 

All gasifiers and fuels displayed a bimodal particle mass size distribution with a fine mode in the <0.5 µm size range and a coarse mode in the >0.5 µm size range. Compared with the mass concentration of the coarse mode the mass concentration of the fine mode was low from all gasifiers. The evaluation of the results for the fine-mode PM was complicated by condensing potassium chloride for the CFB gasifier when using miscanthus as fuel and by condensing tars for the indirect BFB gasifier when using wood C as fuel. The mass concentration of the coarse-mode PM was higher from the CFB gasifier than from the two BFB gasifiers. The coarse-mode PM from the BFB gasifier when using wood A as fuel was dominated by char. In the CFB gasifier the coarse-mode PM was mainly ash and bed material when using all fuels. The coarse-mode PM from the indirect BFB gasifier when using wood C as fuel was mainly ash.

Place, publisher, year, edition, pages
Växjö, Kalmar: Linnaeus University Press, 2011
Series
Linnaeus University Dissertations ; 50/2011
Keywords
biomass gasification, fluidized bed, particulate matter, particle morphology, particle elementary composition
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-11473 (URN)978-91-86491-80-2 (ISBN)
Public defence
2011-05-27, Wicksell, Linnéuniversitetet, 351 95 Växjö, Växjö, 10:00 (English)
Opponent
Supervisors
Available from: 2011-04-27 Created: 2011-04-27 Last updated: 2011-05-02Bibliographically approved

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Gustafsson, EvaLin, LetengStrand, Michael

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