miun.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production
Holmen Paper AB, Norrköping.
HEAD Engineering AB, Nacka strand.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0003-3381-5516
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Show others and affiliations
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 3, p. 448-459Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 33, no 3, p. 448-459
Keywords [en]
chip pretreatment, double disc refiner, energy efficiency, mechanical pulping, refining intensity, sodium sulphite
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-34604DOI: 10.1515/npprj-2018-3052ISI: 000450923900011Scopus ID: 2-s2.0-85053157973OAI: oai:DiVA.org:miun-34604DiVA, id: diva2:1253073
Available from: 2018-10-03 Created: 2018-10-03 Last updated: 2018-12-11Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Engberg, Birgitta A.Berg, Jan-ErikEngstrand, Per

Search in DiVA

By author/editor
Engberg, Birgitta A.Berg, Jan-ErikEngstrand, Per
By organisation
Department of Chemical Engineering
In the same journal
Nordic Pulp & Paper Research Journal
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 280 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf