Omblandning av råmaterial för hållbar energiomvandling i cirkulerande fluidiserade bäddar
Typ
Examensarbete för kandidatexamen
Bachelor Thesis
Bachelor Thesis
Program
Publicerad
2024
Författare
Blomquist, Samuel
Ellertsson, Tess
Eriksson, Mikael
Karlsson, Moa
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
To streamline the energy conversion of biomass to power, heat and biofuels in order
to break the fossil fuels dependency is of great societal interest. In accordance with
this, this work aims to contribute with new knowledge concerning mixing of biomass
in circulating fluidized beds (CFB). The experimental setup that the work makes use
of consists of a fluid-dynamical downscaled CFB cold model in scale 1:13 compared
to a commercial 200 MW boiler, a magnetic particle tracking system and a trace
particle. The result of this work shows that (i) There exists a flow structure in the
model’s chamber that emerges from the inflow of solids; (ii) The fluidization velocity
affects the flowstructure’s shape; (iii) There is a stagnant zone in the chamber.
During low pressure difference in the chamber the trace particle gets stuck in the
stagnant zone and there exists a threshold value in pressure difference for which the
tracer particle can leave the zone. These conclusions call for further research about
flow structures inside CFBs.
Beskrivning
Ämne/nyckelord
biomass , bottombed-region , circulating fluidized beds , fluid dynamical scaling , flow of solids , MPT