<div class="csl-bib-body">
<div class="csl-entry">Lunzer, A. (2018). <i>CPFD simulation in Barracuda VR of a novel dual fluidized bed cold flow model</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2018.56062</div>
</div>
-
dc.identifier.uri
https://doi.org/10.34726/hss.2018.56062
-
dc.identifier.uri
http://hdl.handle.net/20.500.12708/7735
-
dc.description.abstract
The target of this master's thesis is to simulate a cold flow model of a novel biomass gasification plant. The fluid dynamical behavior depends heavily on the fluid's and particle's properties and in real reactors a particle size distribution (PSD) is present. An Eulerian-Eulerian approach is only capable to simulate large applications at the expense of high computational costs if the actual PSD is considered. An Eulerian-Lagrangian approach is capable of simulating a PSD and in particular the multi-phase particle in cell (MP-PIC) method is designed for simulations with a high number of particles. Therefore, Barracuda VR, a software-tool with an implemented MP-PIC method specifically designed for CPFD (computational particle fluid dynamics) simulations, was the software of choice. The discussed cold flow model in this thesis is located at TU Wien and several experiments have already been conducted. Those experiments were used to verify the simulation results. The solid used is composed of bronze particles with a Sauter diameter of 81.7m and a given PSD. The simulations and adjustments were rated on the one hand qualitatively by visual observation of the particle volume fraction and distribution of the particles in the reactor and on the other hand quantified by comparing the measured and simulated data of the particle circulation rate and the pressure at designated locations. The simulations were conducted using different drag laws since they have a great influence on the simulation results. An energy-minimization multi-scale (EMMS) approach, a blended Wen-Yu and Ergun (WYE) drag law, and a drag law of Ganser were used. Furthermore, a focus was set onto the normal particle stress, which plays a significant role in close-packed regions. The constant PS to calculate the particle stress was modified, leading to a higher normal stress near close-pack and subsequently reducing the particle volume fraction. Another aspect was raising the fluidization rate in the loop seals to increase the particle circulation rate, since it was underestimated depending on the settings (e.g. PS constant). By optimizing the settings, the simulation became stable and flooding behavior, experienced at the start, did not occur anymore. The Ganser drag law was found to be the best suited drag law for the simulation. The WYE drag law overpredicted the mass flow leading to an unstable system and the EMMS's predicted particle flow rate was unrealistically small while calculating partly good fits for the pressure profile in the fuel reactor's column. The Ganser drag law combined with an adjusted PS value with (PS = 30Pa) or without (PS=50Pa) increased loop seal fluidization rates was providing the best performance.
en
dc.language
English
-
dc.language.iso
en
-
dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
-
dc.subject
Fluidized Bed
en
dc.subject
Cold Flow Model
en
dc.subject
Simulation
en
dc.subject
Barracuda
en
dc.title
CPFD simulation in Barracuda VR of a novel dual fluidized bed cold flow model
en
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2018.56062
-
dc.contributor.affiliation
TU Wien, Österreich
-
dc.rights.holder
Andreas Lunzer
-
dc.publisher.place
Wien
-
tuw.version
vor
-
tuw.thesisinformation
Technische Universität Wien
-
dc.contributor.assistant
Kraft, Stephan
-
tuw.publication.orgunit
E166 - Institut für Verfahrenstechnik, Umwelttechnik und technische Biowissenschaften
-
dc.type.qualificationlevel
Diploma
-
dc.identifier.libraryid
AC15166355
-
dc.description.numberOfPages
141
-
dc.identifier.urn
urn:nbn:at:at-ubtuw:1-115953
-
dc.thesistype
Diplomarbeit
de
dc.thesistype
Diploma Thesis
en
dc.rights.identifier
In Copyright
en
dc.rights.identifier
Urheberrechtsschutz
de
tuw.advisor.staffStatus
staff
-
tuw.assistant.staffStatus
staff
-
item.openaccessfulltext
Open Access
-
item.grantfulltext
open
-
item.cerifentitytype
Publications
-
item.mimetype
application/pdf
-
item.openairecristype
http://purl.org/coar/resource_type/c_bdcc
-
item.languageiso639-1
en
-
item.openairetype
master thesis
-
item.fulltext
with Fulltext
-
crisitem.author.dept
E317 - Institut für Leichtbau und Struktur-Biomechanik
-
crisitem.author.parentorg
E300 - Fakultät für Maschinenwesen und Betriebswissenschaften