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Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production

  • Christer Sandberg EMAIL logo , Erik Nelsson , Birgitta A. Engberg , Jan-Erik Berg and Per Engstrand
Published/Copyright: August 22, 2018
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Nordic Pulp & Paper Research Journal
From the journal Nordic Pulp & Paper Research Journal Volume 33 Issue 3

Abstract

Increased wood softening and refining intensity have earlier been utilized to improve refining efficiency in mechanical pulping. We have evaluated a combination of increased softening by low dose sulphite chip pretreatment and increased intensity by feeding segment design in a TMP line for production of high quality printing papers.

Norway spruce wood chips were preheated, compressed in an Impressafiner and impregnated with water or sodium sulphite solutions (Na2SO3 charges 3.6 and 7.2 kg/t). Chips were refined in two parallel 68” double disc refiners using two different refining conditions: standard bidirectional segments at normal production rate (9 t/h) and feeding segments at increased production rate (11.1–12.1 t/h).

The feeding segments enabled a 30 % increase in production rate. Refining with feeding segments at 12.1 t/h production rate combined with chip pretreatment with 3.6 kg/t sodium sulphite reduced the specific energy 360 kWh/t (19 %) compared to refining with standard segments and no pretreatment. Pulp properties were similar for the two configurations. The combination of feeding segments and chip pretreatment with water reduced the specific energy 180 kWh/t (9 %). Implementation of most of the technology presented has reduced the electrical energy use for the mill by approximately 80 GWh/year.

Keywords: chip pretreatment; double disc refiner; energy efficiency; mechanical pulping; refining intensity; sodium sulphite

Funding source: Knowledge Foundation

Award Identifier / Grant number: 20100281

Funding source: Energimyndigheten

Award Identifier / Grant number: 2009-001882

Funding statement: This work was performed within the research program “Energy Efficient Mechanical Pulping” at FSCN, Mid Sweden University and was financed by the Knowledge Foundation (grant No. 20100281), the Swedish Energy Agency (grant No. 2009-001882) and by in-kind from Holmen AB.

Acknowledgments

The authors are most grateful to the staff at the Braviken mill that assisted with planning and performance of the mill trials.

  1. Conflict of interest: The authors declare no conflicts of interest.

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Received: 2018-03-22
Accepted: 2018-06-05
Published Online: 2018-08-22
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Editorials
  3. Farewell and good luck to Nordic Pulp & Paper Research Journal
  4. Change of Editor-in-Chief
  5. Biorefinery
  6. Kinetic study on the decomposition of cellulose into 5-hydroxymethylfurfural in an ionic liquid/organic biphasic system
  7. Antibacterial evaluation of CNF/PVAm multilayer modified cellulose fiber and cellulose model surface
  8. Chemical pulping
  9. Dewatering properties of low grammage handsheets of softwood kraft pulps modified to minimize the need for refining
  10. NSSC pulping of fast growing trees
  11. Addition of corn fiber xylan to eucalyptus and pinus pulp and its effect on pulp bleachability and strength
  12. Recovery
  13. Removal of hazardous trace elements from green liquor dregs by mechanical separation methods
  14. Bleaching
  15. Additives to decrease cellulose chain scission during ozone bleaching of wheat straw pulp
  16. Mechanical pulping
  17. Comparative properties of nanofibers produced using unbleached and bleached wheat straw pulps
  18. Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production
  19. An experimental study of the chipping process with focus on energy consumption and chipping angles
  20. Average fibre length as a measure of the amount of long fibres in mechanical pulps – ranking of pulps may shift
  21. Paper technology
  22. The effect of in-line foam generation on foam quality and sheet formation in foam forming
  23. The wet strength of water- and foam-laid cellulose sheets prepared with polyamideamine-epichlorohydrin (PAE) resin
  24. Manufacture of high bulk paper using alkali swollen kraft pulp
  25. Paper physics
  26. The impact of zeolite filler on ageing and mechanical failure of paper
  27. The relationship between shrinkage and elongation of bleached softwood kraft pulp sheets
  28. Paper chemistry
  29. Engineered porous calcium silicate as paper filler: effect of filler morphology on paper properties
  30. Printing
  31. Edge spread function for the paper-ink system
  32. Packaging
  33. Lignin-containing coatings for packaging materials
  34. Environmental impact
  35. Application of Fenton’s reagent degrades dissolved and colloidal substances in old corrugated container white water
  36. Quick estimation for pollution load contributions of aromatic organics in wastewater from pulp and paper industry
  37. Recycling
  38. Circular action treatment (CAT): a new strategy for mechanical treatment of old corrugated containers II – comparison of CAT with low-consistency beating
  39. Corrigendum
  40. Corrigendum to: The influence of bar width on bar forces and fibre shortening in low consistency pulp refining
https://doi.org/10.1515/npprj-2018-3052
Keywords for this article
chip pretreatment; double disc refiner; energy efficiency; mechanical pulping; refining intensity; sodium sulphite

Articles in the same Issue

  1. Frontmatter
  2. Editorials
  3. Farewell and good luck to Nordic Pulp & Paper Research Journal
  4. Change of Editor-in-Chief
  5. Biorefinery
  6. Kinetic study on the decomposition of cellulose into 5-hydroxymethylfurfural in an ionic liquid/organic biphasic system
  7. Antibacterial evaluation of CNF/PVAm multilayer modified cellulose fiber and cellulose model surface
  8. Chemical pulping
  9. Dewatering properties of low grammage handsheets of softwood kraft pulps modified to minimize the need for refining
  10. NSSC pulping of fast growing trees
  11. Addition of corn fiber xylan to eucalyptus and pinus pulp and its effect on pulp bleachability and strength
  12. Recovery
  13. Removal of hazardous trace elements from green liquor dregs by mechanical separation methods
  14. Bleaching
  15. Additives to decrease cellulose chain scission during ozone bleaching of wheat straw pulp
  16. Mechanical pulping
  17. Comparative properties of nanofibers produced using unbleached and bleached wheat straw pulps
  18. Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production
  19. An experimental study of the chipping process with focus on energy consumption and chipping angles
  20. Average fibre length as a measure of the amount of long fibres in mechanical pulps – ranking of pulps may shift
  21. Paper technology
  22. The effect of in-line foam generation on foam quality and sheet formation in foam forming
  23. The wet strength of water- and foam-laid cellulose sheets prepared with polyamideamine-epichlorohydrin (PAE) resin
  24. Manufacture of high bulk paper using alkali swollen kraft pulp
  25. Paper physics
  26. The impact of zeolite filler on ageing and mechanical failure of paper
  27. The relationship between shrinkage and elongation of bleached softwood kraft pulp sheets
  28. Paper chemistry
  29. Engineered porous calcium silicate as paper filler: effect of filler morphology on paper properties
  30. Printing
  31. Edge spread function for the paper-ink system
  32. Packaging
  33. Lignin-containing coatings for packaging materials
  34. Environmental impact
  35. Application of Fenton’s reagent degrades dissolved and colloidal substances in old corrugated container white water
  36. Quick estimation for pollution load contributions of aromatic organics in wastewater from pulp and paper industry
  37. Recycling
  38. Circular action treatment (CAT): a new strategy for mechanical treatment of old corrugated containers II – comparison of CAT with low-consistency beating
  39. Corrigendum
  40. Corrigendum to: The influence of bar width on bar forces and fibre shortening in low consistency pulp refining
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