Can we increase the proportion of electrical energy into fibre development in existing HC-refiners?
Paper in proceeding, 2014

Currently some 5 % of the electrical energy input in high consistency refining can be attributed to fibre development work. The rest is related to thermo- dynatnical steam generation. Can this unfavourable relation between fibre development and heat generation eventually be improved? A pre-requisite to consistent improvement is a stable process, controlled to targets deduced from profound process evaluations. This statement is elaborated based on two case studies and extensive refiner modelling. It is indicated that a well designed process including its basic process control can with proper refiner control reach energy reductions in excess of 20 %. Proper selections of process targets aligned with choice of segments can further increase the energy reduction in existing lines. These drastic energy reductions will demand concurrent observations and process modelling based on spatial measurements in the refining zone rather than slow, inadequate feedback control from pulp property measurements downstream. This will furthermore stress the need for more advanced control schemes if the full potential is to be captured. Additionally this approach will be a key element in the development of novel process approaches with even larger potential of energy reduction.


Anders Karlström

Chalmers, Signals and Systems, Systems and control

J. Hill

QualTech AB

O. Ferritsius

Mid Sweden University

R. Ferritsius

Stora Enso Kvarnsveden

Mid Sweden University

P. Engstrand

Mid Sweden University

International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014

29th International Mechanical Pulping Conference, IMPC 2014
Helsingfors, Finland,

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Materials Engineering

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