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
Energieffektivisering genom förvärmning av flis till kokare med sekundärvärme
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2012 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Energy efficiency improvement by pre heating of woodchips to kraft digester with secondary heat (English)
Abstract [en]

The Swedish pulp and paper industry meets higher demand for energy efficiencyi mprovements with increasing energy prices and changes in the Swedish renewable energy certificate system. One action of energy efficiency improvement is by using secondary heat, that otherwise would have been treated as waste heat, for use in a system with lower temperature demands. The aim of this Master´s thesis is to identify possible secondary heat sources in a typical Swedish pulp and paper mill and to investigate what economic benefits the secondary heat will provide when being used for pre heating of wood chips to a kraft digester.

The Master´s thesis focuses on three secondary heat sources; dry warm air, warm water and moisture saturated warm air located inside the pulp or paper mill. Two types of kraft digesters are simulated within this study, a typical Scandinavian digester and a modern twin vessel steam phase digester.

Due to quality aspects and low temperature level drying is the drying technology with dry warm air rejected. Using warm water in direct contact with wood chips increases the quantity of water to the evaporation plant and thus reduced pulp or paper production and is therefore also rejected. The thesis nevertheless indicates a goodopportunity for further investigation of using moisture saturated warm air for preheating of wood chips. The humid air, from a drying machine or produced from secondary heat warm water, is used in a theoretical modified belt drier. Conservative assumptions regarding heat transfer and investment cost calculations yield a yearly net saving for a typical Swedish pulp mill at over 5 MSEK with a return on investment at 7years.

Place, publisher, year, edition, pages
2012. , 88 p.
Series
UPTEC ES, ISSN 1650-8300 ; 12022
Keyword [en]
pre heating of wood chips, kraft digester, energy efficiency improvement
Keyword [sv]
förvärmning av flis, energieffektivisering, sulfatmassabruk, massakokare
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-177338OAI: oai:DiVA.org:uu-177338DiVA: diva2:540423
External cooperation
ÅF Industry AB
Educational program
Master Programme in Energy Systems Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-06 Created: 2012-07-10 Last updated: 2012-08-06Bibliographically approved

Open Access in DiVA

fulltext(7842 kB)1555 downloads
File information
File name FULLTEXT01.pdfFile size 7842 kBChecksum SHA-512
54b217a136c5df5763bfb1891a05e7b356fd92582d43eabce62458d6c3bb7738ac898b493fc6eab1d1a046261d564eca4f7e749659eb6da2d70a7d2bb262bf1e
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Ivarsson, Magnus
By organisation
Department of Physics and Astronomy
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1555 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 600 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