Publication Details

Category Text Publication
Reference Category Book chapters
Title (Primary) Possibilities of torrefied biomass co-gasification and co-firing
Title (Secondary) DGMK-Tagungsbericht 2014-2 "Konversion von Biomassen". DGMK-Fachbereichstagung, Rotenburg a.d. Fulda, 12.-14. Mai 2014
Author Witt, J.; Bienert, K.; Carbo, M.; Kiel, J.; Wolfesberger-Schwabl, U.; Thrän, D.
Year 2014
Page From 105
Page To 112
Language englisch
UFZ wide themes RU6;
Abstract The European (FP7) project SECTOR, started in January 2012, aims at the further
development and the reduction of the time to market of torrefaction-based technologies for
the production of solid bioenergy carriers. In torrefaction, biomass is heated up in the
absence of oxygen to at least 250°C. By combining torrefaction with pelleting or briquetting,
biomass can be converted into high-energy-density bioenergy carriers with improved
behaviour in (long-distance) transport, handling and storage. Torrefaction also creates
superior properties for biomass in many major end-use applications. The process has the
potential to provide a significant contribution to an enlarged raw material portfolio for
sustainable biomass fuel production inside Europe by including both agricultural and forestry
biomass (residues).
This paper will present an overview of the origin and characterisation of torrefied biomass as
well as the most important results of the first project phase. About 100 tons of torrefied
biomass were produced and densified which has led to the formulation of dedicated recipes
for various feedstocks. The torrefied pellets and briquettes were tested to assess the material
performance during handling and storage as well as in small- and large-scale end-use
applications. These results will be used to further improve the torrefied product quality in the
second phase of the project.
Torrefied pellets and briquettes with different degrees of torrefaction were characterised with
respect to durability, weathering, biodegradation, self-heating, self-ignition and dust
explosion. Larger samples of torrefied pellets have been subjected to outdoor stockpile tests,
and to assess handling in existing feed lines of coal-fired power plants. Three principal enduse
applications for torrefied biomass are under investigation: co-firing in pulverised fuel
boilers, (co-)gasification in entrained-flow gasifiers and combustion in commercial pellet
boilers. Results that were obtained during lab-, pilot- and large-scale thermal conversion
trials will be presented. Among other tests results of a large scale co-gasification test in a
coal power plant with an output of 253 MWel (with 1200 tons of torrefied biomass pellets,
biomass share till 70 % on energy basis) could be involved. A further large scale co-firing test
is in planning.
In summary, during the first two years of SECTOR, project partners have been able to
produce torrefied biomass of a better and more constant quality, and consistent data sets on
logistics and end-use performance contribute to increasing confidence levels amongst
relevant stakeholders.
Persistent UFZ Identifier
Witt, J., Bienert, K., Carbo, M., Kiel, J., Wolfesberger-Schwabl, U., Thrän, D. (2014):
Possibilities of torrefied biomass co-gasification and co-firing
DGMK-Tagungsbericht 2014-2 "Konversion von Biomassen". DGMK-Fachbereichstagung, Rotenburg a.d. Fulda, 12.-14. Mai 2014
DGMK, Hamburg, p. 105 - 112