Title:
Biomass Pyrolysis With Bio-Oil Recycle to Increase Energy Recovery in Biochar
Author(s):
Phounglamcheik, A., Wretborn, T., Umeki, K.
Document(s):
Paper
Poster
Abstract:
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.
Keywords:
biomass, bio-oil, pyrolysis, blast furnace, biochar
Topic:
Biomass Conversion Technologies for Liquid and Gaseous Fuels, Chemicals and Materials
Subtopic:
Production of thermally treated solid biofuels
Event:
25th European Biomass Conference and Exhibition
Session:
3CV.2.6
Pages:
1388 - 1392
ISBN:
978-88-89407-17-2
Paper DOI:
10.5071/25thEUBCE2017-3CV.2.6
Price:
FREE
