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Two-phase transport model for the pyrolysis process of a vertical dry wood cylinder, including the surrounding flow field
Mälardalen University, Department of Public Technology.
Mälardalen University, Department of Public Technology.ORCID iD: 0000-0003-1962-2232
Mälardalen University, Department of Public Technology.ORCID iD: 0000-0001-8849-7661
2006 (English)In: International Journal of Green Energy, ISSN 1543-5075, Vol. 3, no 1, 63-78 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes a mathematical model for the pyrolysis of a small dry pine wood cylinder. The computational domain is axisymmetric and involves the heating chamber, with the wood cylinder vertically situated in the centre of the chamber. The model simulates the laminar flow around the particle and the laminar flow inside the wood/char matrix by applying a two-phase transport model where the solid wood/char matrix acts as one phase and the various gases produced from the pyrolysis process is assembled in the other phase.

Convective, conductive and thermal radiation transfer modes are included in the model. A two-step pyrolysis reaction scheme is used for the modelling of the conversion from wood to tar and gas. Both the thermal conductivity and the permeability of the wood/char matrix are modelled anisotropically in order to capture the directional differences in heat and mass transport, existing in real wood.

Results from simulations are compared with measurements from literature for the centre core solid temperature and the conversion from wood to char, tar and pyrolysis gas in the particle during heating. The results show very good agreement with the measured temperature profile. The simulated conversion profile shows an overall good agreement with the measurements, however with discrepancies in the early stage of the process. Besides the successful validation with the experimental data, it provides us with all the details of the distribution of the migrating pyrolysis gas and tar, the temperature, the velocity flow field and pressure in the wood/char cylinder.

Place, publisher, year, edition, pages
2006. Vol. 3, no 1, 63-78 p.
Keyword [en]
wood pyrolysis, two-phase flow, pyrolysis gas plumes, wood/char thermal conductivity, wood/char permeability
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-3227DOI: 10.1080/01971520500439518ISI: 000236121600005Scopus ID: 2-s2.0-33744999150OAI: oai:DiVA.org:mdh-3227DiVA: diva2:115891
Available from: 2006-06-19 Created: 2006-06-19 Last updated: 2014-01-09Bibliographically approved

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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