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Biomass pyrolysis with bio-oil recycle to increase energy recovery
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.ORCID-id: 0000-0001-8372-4386
Luleå tekniska universitet.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
2017 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This study aims at increasing char yield by recycling bio-oil without negative impact on char qualities, i.e. carbon content and heating value. Pyrolysis experiments on spruce and birch chips were carried in a macro-thermogravimetric analyzer. To examine the effect of bio-oil recycle, dried raw woodchips, pure bio-oil, and woodchips impregnated with bio-oil (10, 20 and 25% on mass basis) were compared. The experiments were carried out by introducing sample into the reaction zone with the flow of N2 and at the temperature range of 300 to 600 ˚C. Pyrolysis of the bio-oil impregnated woodchip gave higher char yield than the pyrolysis of raw woodchip. By the 20% (m/m) bio-oil impregnation, char yield increased by 18.9% (spruce) and 19.1% (birch) on average from the raw woodchip pyrolysis. In addition, the char yield from bio-oil impregnated woodchips was higher than the interpolated char yield of raw woodchips and bio-oil, indicating that synergy effect exists by bio-oil impregnation compared with mere recycling of bio-oil. However, high heating rate corresponded to high temperature pyrolysis, i.e. above 400 ˚C, created cavities and breakages on woodchips, which minimized the secondary reaction. Neither carbon content nor heating value of char was influenced by bio-oil impregnation. Energy yield also showed improvement by increasing bio-oil recycling ratio. For example, energy yield of char from woodchips at the temperature of 340 ˚C increased from 48.4% with raw woodchips to 64.5% by woodchips with 25% of bio-oil impregnation.

Ort, förlag, år, upplaga, sidor
ETA-Florence Renewable Energie , 2017. s. 1388-1392
Serie
European biomass conferences and exhibition proceedings, ISSN 2282-5819
Nyckelord [en]
Pyrolysis, biomass, biochar, bio-oil, blast furnace
Nationell ämneskategori
Kemiska processer Energiteknik
Forskningsämne
Energiteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-65214DOI: 10.5071/25thEUBCE2017-3CV.2.6Scopus ID: 2-s2.0-85043757982ISBN: 978-88-89407-17-2 (digital)OAI: oai:DiVA.org:ltu-65214DiVA, id: diva2:1134577
Konferens
25th European Biomass Conference and Exhibition, EUBCE 2017, Stockholm, Sweden, 12-15 June 2017
Forskningsfinansiär
Interreg Nord, 20200224Tillgänglig från: 2017-08-21 Skapad: 2017-08-21 Senast uppdaterad: 2019-08-16Bibliografiskt granskad

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