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  • 1.
    Lindgren, Thore
    et al.
    Luleå tekniska universitet.
    Gustafsson, Thomas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Forsgren, Harry
    Eurocon AB, Örnsköldsvik.
    Johansson, Daniel
    M-real, Husum Mill, Husum.
    Östensson, Jan
    M-real, Husum Mill, Husum.
    Model predictive control of the chip level in a continuous pulp digester: a case study2005In: Pulp & paper Canada, ISSN 0316-4004, Vol. 106, no 11, p. 45-51Article in journal (Refereed)
    Abstract [en]

    This paper describes the digester chip level control problem and shows a MPC system implementation for the level control. The objective with implemented chip level control system is to stabilize the transport conditions in the bottom of the digester by using the chip feed and not the blow flow as the primary manipulated variable. The results indicate a smoother digester operation and a reduction of the kappa number variations compared with the original control system

  • 2.
    Nohlgren, Ingrid
    et al.
    Luleå tekniska universitet.
    Edin, M.
    Luleå tekniska universitet.
    Theliander, Hans
    Chalmers University of Technology.
    Influence of carbon dioxide on the kinetics of the reaction between sodium carbonate and sodium trititanate2003In: Pulp & paper Canada, ISSN 0316-4004, Vol. 104, no 1, p. 37-41Article in journal (Refereed)
    Abstract [en]

    The influence of carbon dioxide on the kinetics for the reaction between sodium carbonate and sodium trititanate was studied. Experiments were carried out at four different temperatures (820-880°C) and with four different amounts of carbon dioxide (0.5-5%). The time to reach complete conversion was found to decrease with increasing temperature and increase compared to experiments in nitrogen atmosphere. The rate-determining step was determined by fitting different kinetic models to the experimental data

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