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  • 1.
    Höhn, Patrick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Dynamic model and simulation for a high consistency refining process2016In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 1, p. 88-101Article in journal (Refereed)
    Abstract [en]

    A novel dynamic model for the behavior inside of the gap of a high consistency refiner in the pulp and paper industry is presented. As the original entropy model gives additional information about the work split between thermodynamic effects and fiber changes inside the refining zone, it is used as a base for a dynamic model to describe the efficiency of the refining process. This model is derived for the mass flow rates of steam and water, changes of the work distribution and consistency as a function of radius and time. The temperature distribution inside the refining zone, specific energy, inlet consistency and total mass flow rate are used as input signals. After a general presentation in continuous-time, the spatial discrete model is also discretized in temporal dimension. Both discretizations are dependent on each other as the ratio can be considered as a flow speed of the fluid elements and it affects the residence time inside the refining zone. Thereafter, results from a simulation with assumed input parameters using the discrete model are presented and compared with the output of previously published models. Other dynamic models exhibit similar oscillations when applying changes to the inputs. Furthermore, the overall general trend is consistent with other published steady-state models. Hence, we expect the newly proposed model to be reliable and more efficient to describe the behavior inside the refining zone.

  • 2.
    Höhn, Patrick
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Energy Optimization of a High Consistency Refiner Process2014Conference paper (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 3.
    Höhn, Patrick
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Energy Optimization of a High Consistency Refiner Process2014In: 2014 IEEE International Conference on Control Applications (CCA 2014): Juan Les Antibes, France, 8 -10 October 2014, Piscataway, NJ: IEEE Communications Society, 2014, p. 197-203Conference paper (Refereed)
    Abstract [en]

    This paper presents a concept for energy optimization dealing with high consistency (HC) refining processes in the pulp and paper industry. Models for the outlet consistency and Gurley number used in the optimization are briefly described. The specific energy is used as manipulated variable. Additionally, the inlet consistency can be adjusted to a fixed value. While keeping the energy consumption as low as possible, it is still attempted to keep outlet consistency and Gurley number close to its desired value. The optimization uses a cost function with quadratic terms. An explicit solution for the optimization problem is derived. Additionally, the results are compared with findings from numerical optimization using a global search algorithm and an interior point method. Results presented are consistent with each other and indicate potential for energy savings.

  • 4.
    Höhn, Patrick
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Sensitivity Analysis of Models for High Consistency Refining Process2013In: 2013 IEEE Multi-conference on Systems and Control (Conference on Control Applications), Hyderabad, India, August 28-30, 2013, 2013, p. 899-905Conference paper (Refereed)
    Abstract [en]

    This paper deals with the sensitivity analysis of models for the high consistency refining process in the pulp and paper industry. Several models reported in literature are considered, which are screened for their potential use in thedesign of controllers for refiners or in the optimization of refiner operation. For the two most promising models a sensitivity analysis is conducted which suggests that the temperature profile inside the refiner and the inlet consistency are the most important process variables. It is further suggested that both variables variables are utilized to control the refining process based on these models. Moreover, computer simulations with constant, linear increasing and parabolic temperature profiles are performed, which confirm the importance of the temperature profile for the entropy based model.

    Download full text (pdf)
    FULLTEXT01
  • 5.
    Höhn, Patrick
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    System identification approach to the modeling of an LC disc refiner process chain2012In: Proceedings of Reglermöte 2012, 2012Conference paper (Other academic)
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