Advanced

Predicting water removal during vacuum dewatering from fundamental fibre property data

Stenström, Stig LU and Nilsson, Lars (2015) In Nordic Pulp & Paper Research Journal 30(2). p.265-271
Abstract
Control of the solids content after vacuum dewatering is vital for efficient control and energy use of the paper machine. Dewatering is a complex function of many parameters such as fibre and pulp properties as well as settings on the paper machine and a predictive model for dewatering will require extensive and detailed studies of the occurring physical phenomena. The hypothesis investigated in the present study is that fibre width and fibre length density measured for fibres suspended in water can be used for estimating the achievable dryness in vacuum dewatering. The hypothesis was tested by comparing model predictions to experimental data for 11 different pulps. The results show that the dryness after vacuum dewatering can be estimated... (More)
Control of the solids content after vacuum dewatering is vital for efficient control and energy use of the paper machine. Dewatering is a complex function of many parameters such as fibre and pulp properties as well as settings on the paper machine and a predictive model for dewatering will require extensive and detailed studies of the occurring physical phenomena. The hypothesis investigated in the present study is that fibre width and fibre length density measured for fibres suspended in water can be used for estimating the achievable dryness in vacuum dewatering. The hypothesis was tested by comparing model predictions to experimental data for 11 different pulps. The results show that the dryness after vacuum dewatering can be estimated from the fibre length density and the fibre width for the fresh pulps using an elliptical fibre cross-section model with a ratio of 0.48 between the short and long axes. For the dried pulps a lower value was needed to reach a good agreement. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Vacuum dewatering, Dryness, Fibre length density, Fibre diameter, WRV
in
Nordic Pulp & Paper Research Journal
volume
30
issue
2
pages
265 - 271
publisher
Arbor Publishing AB
external identifiers
  • wos:000354806700012
  • scopus:84951972008
ISSN
0283-2631
DOI
10.3183/NPPRJ-2015-30-02-p265-271
language
English
LU publication?
yes
id
b92893e7-3d97-40ca-a729-ecb7618b562a (old id 7422554)
date added to LUP
2015-06-26 12:24:38
date last changed
2017-01-01 06:33:03
@article{b92893e7-3d97-40ca-a729-ecb7618b562a,
  abstract     = {Control of the solids content after vacuum dewatering is vital for efficient control and energy use of the paper machine. Dewatering is a complex function of many parameters such as fibre and pulp properties as well as settings on the paper machine and a predictive model for dewatering will require extensive and detailed studies of the occurring physical phenomena. The hypothesis investigated in the present study is that fibre width and fibre length density measured for fibres suspended in water can be used for estimating the achievable dryness in vacuum dewatering. The hypothesis was tested by comparing model predictions to experimental data for 11 different pulps. The results show that the dryness after vacuum dewatering can be estimated from the fibre length density and the fibre width for the fresh pulps using an elliptical fibre cross-section model with a ratio of 0.48 between the short and long axes. For the dried pulps a lower value was needed to reach a good agreement.},
  author       = {Stenström, Stig and Nilsson, Lars},
  issn         = {0283-2631},
  keyword      = {Vacuum dewatering,Dryness,Fibre length density,Fibre diameter,WRV},
  language     = {eng},
  number       = {2},
  pages        = {265--271},
  publisher    = {Arbor Publishing AB},
  series       = {Nordic Pulp & Paper Research Journal},
  title        = {Predicting water removal during vacuum dewatering from fundamental fibre property data},
  url          = {http://dx.doi.org/10.3183/NPPRJ-2015-30-02-p265-271},
  volume       = {30},
  year         = {2015},
}