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Investigating the influence of bed structure on pulp displacement washing using an in-situ measurement technique

Jenny Lindau (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Peter Sedin (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik)
Journal of Pulp and Paper Science Vol. 33 (2007), 4, p. 189-198.
[Artikel, refereegranskad vetenskaplig]

The influence of bed structure on pulp washing was investigated in this work using an in situ measurement technique. The experimental equipment was a test piston filter press equipped with a γ-radiation source and a scintillation detector that was used to measure concentrations and porosity within the pulp bed during the washing process. Two types of pulp were investigated: groundwood and kraft pulp. Both the influence of flocculation and a porosity gradient on washing efficiency were examined. It was shown that washing efficiency was lower for a flocculated bed than for a corresponding non-flocculated bed. It was also shown that the porosity gradients obtained in this study virtually do not affect the washing efficiency. Local dispersion coefficients were also obtained and it was shown that they were within the experimental error independent of the measurement height.

Nyckelord: pulp displacement washing, experimental, local properties, dispersion



Denna post skapades 2008-01-02. Senast ändrad 2008-07-01.
CPL Pubid: 64130

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik (2005-2014)

Ämnesområden

Kemiteknik
Kemiska processer
Pappers-, massa- och fiberteknik

Chalmers infrastruktur

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Denna publikation ingår i:


Pulp displacement washing - An investigation of the influence of fibre and bed properties using a novel measurment technique