Biomass losses during short-term storage of bark and recovered wood
Storage of biomass is associated with problems like heat development, biomass losses, and reduction of the fuel quality. Certain processes such as biological- and chemical degradation are responsible for these storage problems. This master’s thesis was carried out at Vattenfall Research and Developm...
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| Formato: | H3 |
| Lenguaje: | Inglés sueco |
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SLU/Dept. of Energy and Technology
2009
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| Sumario: | Storage of biomass is associated with problems like heat development, biomass
losses, and reduction of the fuel quality. Certain processes such as biological- and
chemical degradation are responsible for these storage problems. This master’s
thesis was carried out at Vattenfall Research and Development AB and is aligned
towards quantifying the biomass losses from short-term storage (1-2 months) of
bark and recovered wood. The biomass was stored in outdoor piles during different
seasons, campaign 1 (summer) and campaign 2 (autumn). Partial covering with
tarpaulins of some of the piles were also investigated. The stored biomass was
analysed for moisture content, ash content and heating value.
The biomass losses that were based on the dry matter losses and reduction of the
net heating value of the fuel were limited in the piles of recovered wood. The bark
piles had higher biomass losses due to higher moisture content and smaller particle
size distribution. Storage of moist bark in large piles leads to temperature
development and subsequently a few percent losses in dry weight. The temperature
development in the piles of recovered wood is limited and more dependent on
ambient conditions. No effects of partial covering of the piles were found since the
covering was most likely too small.
It was found out that the method of quantifying biomass losses used in this report
needs to be improved to be able to quantify small biomass losses during short-term
storage, since it is not sensitive enough. The best way to store biomass at a heating
plant for minimal fuel losses is under roof and with as low initial moisture content
and large particle size distribution as possible. |
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