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Study of the effects of gaseous micro-expansion on the efficiency of convective heat transfer during pyrolysis
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.ORCID iD: 0000-0001-9831-6633
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.ORCID iD: 0000-0002-1837-5439
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
2013 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 106, 253-261 p.Article in journal (Refereed) Published
Abstract [en]

Measurements of temperature in the proximity of wood pellets (8 mm diameter) and thin wooden stick slices (5 cm diameter and 5 mm thickness) were conducted to estimate the effects of mixing between the evolving volatiles and hot steam (T > 700°C) flowing around the particles. Measurements of mass loss of the slices were conducted to estimate the apparent kinetic parameters of their pyrolysis. A simple kinetic model of the process (type II by Pyle and Zaror (1984) [20]) was investigated. The experiments showed a plateau-like part in the graphs of temperature measured in the proximity to the samples. The existence of this plateau-like part agrees with the general data of calorimetric measurements of pyrolysis, which show extensive energy consumption in the beginning of an active production of volatiles. A hypothesis regarding feedback on the process due to the micro-expansion and mixing of volatiles in the convective boundary layer is discussed.

Place, publisher, year, edition, pages
2013. Vol. 106, 253-261 p.
Keyword [en]
Convective boundary layer, Joule-Thomson effect, Pyrolysis
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-118315DOI: 10.1016/j.fuproc.2012.08.005ISI: 000314191800032Scopus ID: 2-s2.0-84870525224OAI: oai:DiVA.org:kth-118315DiVA: diva2:605620
Funder
Swedish Research Council
Note

QC 20130214

Available from: 2013-02-14 Created: 2013-02-14 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Study of pyrolysis and gasification of biomass from the self-organization perspective
Open this publication in new window or tab >>Study of pyrolysis and gasification of biomass from the self-organization perspective
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the analysis of kinetics of i) low-temperature pyrolysis of gaseous hydrocarbons, ii) high-temperature steam gasification of char of wood pellets (>700oC), iii) high temperature pyrolysis of straw pellets in an atmosphere of argon and steam, and iv) high temperature pyrolysis of slices of transversally cut wooden sticks. The results of the kinetic measurements in the high-temperature cases are approximated using a least-square based optimization software, which was specially developed to analyse kinetics prone for deviation from the Arrhenius law.In the thesis a general analysis of the researched materials and kinetics of their pyrolysis and gasification is presented from the self-organization perspective. The energy transfer phenomena in both the pyrolysis and gasification processes of biomass are discussed with an emphasis on an analysis of basic phenomena involving the self-organized dynamics on fractal structures in the chosen biomass samples.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2015. vi, 82 p.
Keyword
pyrolisys, pellets, hydrogen, gasification
National Category
Metallurgy and Metallic Materials Energy Engineering Chemical Process Engineering
Research subject
Materials Science and Engineering; Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-162109 (URN)978-91-7595-478-3 (ISBN)
Public defence
2015-04-10, B1, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council
Note

QC 20150324

Available from: 2015-03-24 Created: 2015-03-20 Last updated: 2015-03-31Bibliographically approved

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Kantarelis, EfthymiosYang, Weihong

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