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@PHDTHESIS{Dolls:1021855,
      author       = {Dolls, Sarah},
      othercontributors = {Abel, Dirk and Kneer, Reinhold},
      title        = {{M}odellbasierte {R}egelung des {A}nfahrvorgangs eines
                      {O}xyfuel-{P}rozesses},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2025-09695},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2025},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2025},
      abstract     = {The present work examines the start-up process of the
                      membrane-based oxyfuel process proposed in the OXYCOAL-AC
                      project (project duration 2004 to 2011). The focus of the
                      work is on a model-based control approach investigated as
                      part of the project participation from 2007 to 2010, which
                      can be used to carry out the start-up process of this
                      process, which requires a large number of additional steps
                      compared to the start-up process of conventional coal-fired
                      power plants due to the novel process structure of the flue
                      gas recirculation and its enrichment with oxygen in a
                      membrane system. While the original research focused on the
                      use of oxyfuel combustion in coal-fired power plants, the
                      focus today is increasingly on industrial processes such as
                      the cement industry or waste incineration, where CO2
                      emissions are generated by material conversions in the
                      process. Building on the findings of the OXYCOAL-AC project,
                      general follow-up activities in the field of oxyfuel
                      combustion (SFB Oxyflame) and oxygen supply using membranes
                      (MEM-OXYCOAL and HETMOC) have taken place. The basis for the
                      analysis of the start-up process of the OXYCOAL-AC process
                      is the extension and modification of a component library so
                      that a detailed non-linear model of the entire process can
                      be created, with which the entire start-up process from
                      power plant shutdown to load increase to 100 $\%$ can be
                      simulated. To validate the component models, data from a
                      pilot plant of a project partner is processed and the models
                      are parameterised according to the plant components. The
                      comparison of simulation and measurement data shows that the
                      models can reproduce the real behaviour of the system
                      components well. Based on the detailed process model, a
                      linear, simplified process model is created for use in a
                      model-based predictive controller. For this purpose, the
                      start-up procedure of the process is simulated and the model
                      is linearised along the start-up curve at several transient
                      operating points, reduced and the individual models are
                      combined to form an overall process model. By using a
                      controller with an internal process model to regulate the
                      start-up process, a start-up concept is developed that can
                      take into account the requirements of the
                      temperature-critical ceramic membrane system at all times.
                      Based on the start-up process of a conventional coal-fired
                      power plant, a start-up concept is developed for the
                      OXYCOAL-AC process, in which the start-up process of the
                      flue gas cycle is integrated into the start-up process of
                      the boiler and supplemented by additional measures. As the
                      membrane system only supplies the oxygen required for
                      oxyfuel combustion at high temperatures, the boiler is first
                      started up with ambient air and the resulting flue gas is
                      used to heat up the recirculation circuit before a
                      continuous transition from air operation to oxyfuel
                      operation takes place. In order to achieve the desired
                      OXYCOAL-AC operation as quickly as possible, the maximal
                      allowed temperature change rate is not only maintained, but
                      also maxed out, during the start-up process by using
                      model-based predictive control. For the boiler, taking into
                      account the maximal allowed temperature change rate of the
                      membrane material results in an extension of the start-up
                      time to full load by about 10 percentage points compared to
                      the start-up process in a conventional coal-fired power
                      plant. The full OXYCOAL-AC operation is only reached eight
                      hours later.},
      cin          = {416610},
      ddc          = {620},
      cid          = {$I:(DE-82)416610_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-09695},
      url          = {https://publications.rwth-aachen.de/record/1021855},
}