Sammanfattning
The demand for increased use of CO2-neutral biomass fuels has led to an increased use of difficult
fuels such as straw, agrofuels, and biomass waste streams. However, these types of fuels have
resulted in limited steam temperatures in power boilers and thus limited efficiencies. To challenge
these limitations one alternative is to pre-treat fuels in such a way that the harmful elements either is
removed from the fuels or stabilized so they are not able to form corrosive compounds. Torrefaction,
steam explosion and hydrothermal processes are examples of fuel up-grading treatments.
In this paper, six fuel samples have been studied:
- Original spruce bark
- Torrefied spruce bark
- Pre-washed spruce bark followed by torrefaction
- Original wheat straw
- Torrefied wheat straw
- Pre-washed wheat straw followed by torrefaction
The fuels have been chemically fractionated by treating them consecutively with three different
solvents (H2O, ammonium acetate, 1 M HCl). The solubilities of the elements were determined
showing that the pre-treatments did not significantly change the expected behaviour of the ash forming
elements.
The fuel qualities were improved mainly due to lower chlorine contents. In the case of bark,
torrefaction was enough to improve the quality while in the case with wheat straw also the pre-washing
step was needed.
Originalspråk | Odefinierat/okänt |
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Titel på värdpublikation | 23rd International Conference on Fluidized Bed Conversion - Innovative Fluidized Bed Conversion Technology for a Sustainable Development |
Förlag | The Korean Institute of Chemical Engineers (KIChE) |
Sidor | 1135–1143 |
ISBN (tryckt) | 978-89-950005-7-1 |
Status | Publicerad - 2018 |
MoE-publikationstyp | A4 Artikel i en konferenspublikation |
Evenemang | International Conference on Fluidized Bed Conversion (FBC) - 23rd International Conference on Fluidized Bed Conversion (FBC) Varaktighet: 13 maj 2018 → 17 maj 2018 |
Konferens
Konferens | International Conference on Fluidized Bed Conversion (FBC) |
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Period | 13/05/18 → 17/05/18 |