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Producing single phase fast pyrolysis oils from straw by staged condensation

Producing Single Phase Fast Pyrolysis Condensates
: Conrad, Stefan; Blajin, Cristina; Schulzke, Tim

Fulltext urn:nbn:de:0011-n-4590197 (2.7 MByte PDF)
MD5 Fingerprint: 1078e5d10b153e589c4504e72da983e6
Created on: 2.8.2017

25th European Biomass Conference and Exhibition, EUBCE 2017. Proceedings : Stockholm, 12-15 June 2017
Florence: ETA, 2017
ISBN: 978-88-89407-17-2
European Biomass Conference and Exhibition (EUBCE) <25, 2017, Stockholm>
European Commission EC
H2020; 727463; BioMates
Conference Paper, Electronic Publication
Fraunhofer UMSICHT Oberhausen ()
ablative fast pyrolysis; biomass to liquid (BTL) fuel; upgrading; agricultural residues

Bio-oil produced from straw by means of ablative fast pyrolysis will separate into two phases due to high amount of water. This paper investigates the influence of staged condensation temperature on the water content of the condensates, with the aim of finding the minimum temperature at which the resulting bio-oil in the first stage will be a single phase liquid. The pyrolysis vapours were fractioned using a two-stage condensation system, each stage consisting of a cooler and an electrostatic precipitator (ESP) connected in series. The cooling medium temperature of the first stage was varied between 60 °C and 80 °C, whereas the temperature of the second stage was kept constant at 4 °C. The minimum vapour temperature at which the 1st stage condensate is a single-phase liquid was found to be 65.8 °C. The investigation showed that staged condensation is a possible way of producing single-phase bio-oils with a reduced water content and total acid number (TAN). Compared to the tarry phase of total condensates, the 1st stage condensates had an increased yield of organics.