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@PHDTHESIS{Gvert:753270,
      author       = {Gövert, Benjamin Maximilian},
      othercontributors = {Kneer, Reinhold and Scherer, Viktor},
      title        = {{C}har combustion kinetics using a micro fluidized bed
                      reactor},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2019-00500},
      pages        = {1 Online-Ressource (XXI, 180 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2018},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2019; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2018},
      abstract     = {The char combustion kinetics of low sodium Rhenish lignite
                      (RB) in synthetic air (N2/O2) and oxyfuel atmosphere
                      (CO2/O2) are investigated experimentally and using a 1D
                      modeling approach. Combustion experiments are carried out in
                      an externally heated micro fluidized bed reactor (mFBR) at
                      temperatures of 773 - 1123K with 25 $vol\%$ oxygen. At 873K,
                      the oxygen volume fraction is varied from 15 - 30 $vol\%.$
                      Depending on the reaction rate variance, experiments are
                      repeated 5 - 50 times, resulting in a total of 556 data
                      sets. Time-resolved gas analysis (≤10 Hz) of the reaction
                      products CO2 and CO is performed ex situ with a
                      Fourier-transform infrared (FTIR) spectrometer. Combined
                      with information on the gas mass flow and fuel sample mass
                      per batch, a carbon balance is closed around the reactor.
                      Using this balance, the time-resolved carbon conversion rate
                      dX/dt(t) and total conversion X(t) are computed for each
                      experiment. Modeling of char combustion is done based on the
                      Carbon Burnout Kinetic model version 8 (CBK8) by Hurt et al.
                      [1998], adapted to fluidized bed combustion conditions.
                      Using the adapted model, named CBK/FB, different
                      correlations for fluidized bed heat- and mass transfer, as
                      well as fuel heat capacity and CO/CO2 production ratio at
                      the particle are compared. Using the best-fit combination of
                      heat and mass transfer sub-models, the char kinetic
                      parameters of the CBK/FB model are determined for
                      experiments conducted in synthetic air. The resulting
                      kinetic parameters are plausible and compare favorably to
                      results from literature. Overall, the adapted model predicts
                      carbon conversion times with good precision in synthetic
                      air. A test of the model against experiments in oxyfuel
                      atmosphere does not reveal any systematic deviation.},
      cin          = {412610},
      ddc          = {620},
      cid          = {$I:(DE-82)412610_20140620$},
      pnm          = {DFG project 240954932 - Experimentelle Untersuchung von
                      Pyrolyse- und Koksumsatzkinetiken in einem
                      „Well-Stirred-Reactor“ unter atmosphärischen und
                      druckbeaufschlagten Bedingungen (A01) (240954932) / DFG
                      project 215035359 - TRR 129: Oxyflame - Entwicklung von
                      Methoden und Modellen zur Beschreibung der Reaktion fester
                      Brennstoffe in einer Oxyfuel-Atmosphäre (215035359)},
      pid          = {G:(GEPRIS)240954932 / G:(GEPRIS)215035359},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2019-00500},
      url          = {https://publications.rwth-aachen.de/record/753270},
}