Title:
Characteristics of Bio-oil from Fractionated Condensation of Vapours from Pyrolysis of Residual Forest Biomass in a Prototype of Auger Reactor
Author(s):
Vilas Boas, A.C.M., Tarelho, L.A.C., Marques, C.C., Moura, J.M.O., Santos, M.C., Nunes, M.I.S., Matos, M.A.A.
Document(s):
Paper
Slide presentation
Abstract:
The pyrolysis process convertsresidual biomass into bio-products such as biochar, bio-oil and permanent gas, which can be precursors to biofuels and otherbio-products. Bio-oil is a complex mixture of organic components with high water concentration from biomass moisture andthermochemical decompositionduring pyrolysis,along with high concentration of oxygenated compounds. Enhancing the quality of bio-oil is a challenge that requires effective operational strategies to increase its added-value. This study focuses on investigating a fractional condensation to upgrade bio-oil, generating fractions withdistinct physicochemical characteristics, particularly with low concentration of water and oxygenated compounds.Residual forest biomass (RFB), including eucalyptus and pine branches and eucalyptus leaves, were used as feedstock.The study was conductedusing a prototype-scale auger reactor with continuous operation, equipped with adownstream fractional condensation system for pyrolysis vapors. Thissystem includes a series of three stainless steel condensers at different temperatures, followed by a set of condensers immersed in liquid water in equilibrium with ice at atmospheric pressure.Fractional condensation proved effective in producing bio-oils with distinct characteristics, suchwater concentration, elemental composition (CHNO), and heating value. The bio-oil fraction collected in first condensers (100 to 175 °C) had low water concentration (2 to 6 %wt.) and high heating value (29.2 to 31.4 MJ/kgbio-oil fraction).Subsequent downstream condensers showed two distinct fractions,one similar to the bio-oil collected in first condensers andanother witha high-water concentration.Decreasing condenser temperature correlated with increased water concentration in the bio-oil.
Keywords:
bio-oil, pyrolysis, residual biomass, fractional condensation
Topic:
Biomass, Bio-Based Products and Bioenergy Integration
Subtopic:
Biomass use in biorefineries
Event:
31st European Biomass Conference and Exhibition
Session:
3BO.6.2
Pages:
466 - 473
ISBN:
978-88-89407-23-3
Paper DOI:
10.5071/31stEUBCE2023-3BO.6.2
Price:
FREE
