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Tar Variability in the Producer Gas in a Bubbling Fluidized Bed Gasification System
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.ORCID iD: 0000-0002-6326-4084
2014 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 28, no 12, 7494-7500 p.Article in journal (Refereed) Published
Abstract [en]

Previous studies in an atmospheric bubbling fluidised bed (BFB) gasification system indicated significant tar variability along the system. In this paper the experimental procedure has been improved for reliable results and understanding of tar variability in the producer gas. By introducing a new sample point for tar analysis to the system, experiments indicated tar reduction in the gasifier, probably due to continuous accumulation of char and ash in the bed, as well as in the ceramic filter because of thermo- and catalytic effects. Thermogravimetric analysis of the filter sample indicated 14 % of volatile inorganic compounds, and additional analysis of inorganic parts showed alkali and alkaline earth metal content, well known as tar breakdown catalysts.

Place, publisher, year, edition, pages
2014. Vol. 28, no 12, 7494-7500 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-154532DOI: 10.1021/ef5015617ISI: 000346759800022Scopus ID: 2-s2.0-84949119025OAI: oai:DiVA.org:kth-154532DiVA: diva2:757368
Note

QC 20150122

Available from: 2014-10-22 Created: 2014-10-22 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Biomass gasification in ABFB: Tar mitigation
Open this publication in new window or tab >>Biomass gasification in ABFB: Tar mitigation
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biomass gasification may be an attractive alternative for meeting future energy demand. Although gasification is a mature technology, it has yet to be fully commercialised due to tar formation. This study focuses on the tar mitigation in gas produced in an atmospheric bubbling fluidised bed (ABFB) gasification system.

Previous studies indicated significant tar variability along the system. In this work the experimental procedure has been improved for reliable results and better understanding of tar variability in the producer gas. After having introduced a new sample point for tar analysis to the system, experimental results indicated tar reduction in the gasifier, probably due to continuous accumulation of char and ash in the bed, as well as in the ceramic filter owing to thermal and catalytic effects.

Iron-based materials, provided by Höganäs AB, were applied in a secondary catalytic bed reactor for tar decomposition in the producer gas. It was found that tar concentration depends on catalytic and gasification temperatures and catalyst material. When changing the gasification temperature from 850 °C to 800 °C the conditions in the producer gas also changed from reductive to oxidative, transforming the initial metallic state of catalyst into its oxidised form. It may be concluded that the catalysts in their metallic states in general exhibit a better tar cracking capacity than their corresponding oxides.

Due to the low reactivity of petroleum coke, an alternative may be to convert it in combination with other fuels such as biomass. Co-gasification of petroleum coke and biomass was studied in this work. Biomass ash in the blends was found to have a catalytic effect on the reactivity of petroleum coke during co-gasification. Furthermore, this synergetic effect between biomass and petcoke was observed in the kinetics data. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xviii, 71 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:35
Keyword
Ash, biomass, char, gasification, iron-based, petcoke, tar
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-154530 (URN)978-91-7595-257-4 (ISBN)
Public defence
2014-11-03, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20141022

Available from: 2014-10-22 Created: 2014-10-21 Last updated: 2014-11-04Bibliographically approved

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