Title:
Standard Liquid Fuel for Industrial Boilers from Used Wood
Author(s):
Lindfors, C., Oasmaa, A., Välimäki, A., Ohra-aho, T., Punkkinen, H., Laine-Ylijoki J.
Document(s):
Paper
Slide presentation
Abstract:
The purpose of the research was to validate if the fast pyrolysis bio-oil (FPBO) from used wood would meet the specifications set by the standard EN 16900-2017 for industrial boilers. Commercial used wood Class C was used for fast pyrolysis. According to physical characterization studies, the dominant material groups were (virgin) wood (i.e. no visible coatings) (58 wt%) and chemically treated wood (41 wt%). The share of plastics was 0.7 wt%. The contents of heavy metals were not significant. No bromine was observed and the content of chlorine was =0.05 wt%. Prior pyrolysis studies, the sample was grinded, dried, and sieved. Plastic fraction was separated to over 0.98 mm sieve fraction. The main fraction having particle size of 0.55 - 0.98 mm containing wood was tested in one experiment and a mixture of plastic fraction (over 0.98 mm) and wood fraction (0.55 - 0.98 mm) was tested in two other experiments. The fines below 0.55 mm were removed; Pb was found only in this finest fraction. The pyrolysis experiments were carried out in a bench scale bubbling fluidized bed reactor (1 kg/h). Organic yields were lower (42 - 47 wt%) than with sawdust (62 wt%) but at the same level than those with stored forest residues (46 wt%). The side products char and gases are combusted for process energy in commercial integrated process. The liquid product had a high water content, which resulted in a spontaneous phase separation. The phases were mixed together, and a part of water was gently removed to obtain a single phase product with a water content of 21 wt%. The liquid product was a homogenous fluid, which in most cases met the demands of the EN standard and hence can be used in industrial boilers. All product met the specifications for REACH.
Keywords:
pyrolysis, pyrolysis oil, used wood
Topic:
Biomass Conversion Technologies for Fuels, Chemicals and Materials
Subtopic:
Pyrolysis
Event:
26th European Biomass Conference and Exhibition
Session:
3DO.6.4
Pages:
1030 - 1034
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-3DO.6.4
Price:
FREE
