Study of the effects of gaseous micro-expansion on the efficiency of convective heat transfer during pyrolysis
2013 (English)In: Fuel processing technology, ISSN 0378-3820, Vol. 106, 253-261 p.Article in journal (Refereed) Published
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) ) 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.
Convective boundary layer, Joule-Thomson effect, Pyrolysis
IdentifiersURN: urn:nbn:se:kth:diva-118315DOI: 10.1016/j.fuproc.2012.08.005ISI: 000314191800032ScopusID: 2-s2.0-84870525224OAI: oai:DiVA.org:kth-118315DiVA: diva2:605620
FunderSwedish Research Council
QC 201302142013-02-142013-02-142015-03-24Bibliographically approved