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Thermochemical conversion of biomass pellets: a parametric study for application in downdraft gasification
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 33 p.
Series
Trita-KRV, ISSN 1100-7990 ; 2005:4
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-523ISBN: 91-7178-060-2 (print)OAI: oai:DiVA.org:kth-523DiVA: diva2:14284
Presentation
2005-05-26, sal M3, KTH, Brinellvägen 64, Stockholm, 10:00
Supervisors
Note
QC 20101129Available from: 2005-11-29 Created: 2005-11-29 Last updated: 2010-11-29Bibliographically approved
List of papers
1. Thermochemical characteristics of sugar cane bagasse pellets
Open this publication in new window or tab >>Thermochemical characteristics of sugar cane bagasse pellets
2005 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 84, no 5, 569-575 p.Article in journal (Refereed) Published
Abstract [en]

Pelletisation facilitates utilisation of sugar cane bagasse as a fuel and storage for year-round electricity generation. The present work determines thermochemical characteristics of bagasse pellets of different sizes and origins, using various temperatures (600, 750 and 900 degrees C) and gas flow rates (4, 7 and 10 L/min) with varying concentrations of oxygen (5, 10 and 15 %) in mixtures with nitrogen. Of major interest are the effects of raw material, origin and size of pellets, and the treatment conditions on the rate of pyrolysis and the structure and reactivity of char in combustion. The char yield of the larger pellets of high-ash content bagasse was practically independent of treatment conditions. Smaller pellets gave better mechanical stability of the char but lower reactivity.

Keyword
flaming pyrolysis, pellets, bagasse, gasification, SOFTWOOD PELLETS
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-14063 (URN)10.1016/j.fuel.2004.10.005 (DOI)000226877100011 ()2-s2.0-10844244604 (Scopus ID)
Note
QC 20100712Available from: 2010-07-12 Created: 2010-07-12 Last updated: 2017-12-12Bibliographically approved
2. Pyrolysis and gasification of pellets from sugar cane bagasse and wood
Open this publication in new window or tab >>Pyrolysis and gasification of pellets from sugar cane bagasse and wood
Show others...
2006 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 85, no 10-11, 1535-1540 p.Article in journal (Refereed) Published
Abstract [en]

Wood pellets have become a popular form of biomass for power generation and residential heating due to easier handling both for transportation and for feeders in the treatment units, improved conversion and storage possibilities. The research on wood pellets as fuel has also been intensified during the past decade. However, other biomass sorts in pellet form, such as sugar cane bagasse, have not yet been extensively studied, especially not physical effects on the pellets during thermal treatment. Bagasse and wood pellets of different origin and sizes, shredded bagasse and wood chips have been studied in a thermogravimetric equipment to compare the effects of sort, origin, size and form of biomass during slow pyrolysis and steam gasification. Physical parameters such as decrease of volume and mass during treatment, as well as pyrolysis and gasification rates are of primary interest in the study. An important observation from the study is that for pellets the char density decreased during pyrolysis to a minimum around 450 degrees C, but thereafter increased with continued heating. The wood chips behaved differently with a continuous char density decrease during pyrolysis. Another conclusion from the work is that the size of the pellet has larger impact on the shrinkage behaviour throughout the conversion than the raw material, which the pellet is made of.

Keyword
pyrolysis, char density, steam gasification, CHIMNEY EMISSIONS, SOFTWOOD PELLETS
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-14066 (URN)10.1016/j.fuel.2005.12.005 (DOI)000237998300028 ()2-s2.0-33645334656 (Scopus ID)
Note
QC 20100712Available from: 2010-07-12 Created: 2010-07-12 Last updated: 2017-12-12Bibliographically approved

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