Energy & Fuels · 2011 · 401 citations · 24 references
Life SciencesBioengineeringChemical EngineeringBiochemical EngineeringBioprocess EngineeringBioreactor DesignAlgal BiotechnologyAlgal CultivationBiofuel ProductionBiomass ConversionBiomass Energy SystemsRenewable FeedstocksAlgal Biofuel ProductionAlgal Biomass ConversionBiofuel Production From Green AlgaeEnergy ConsumptionLiquefactionMicroalgal BiofuelsPyrolysisSlow Pyrolysis
Bio‑oil is produced by thermochemical liquefaction or pyrolysis of biomass, with TCL operating at 250–350 °C and 5–20 MPa on wet feedstocks, while pyrolysis uses 400–600 °C at atmospheric pressure and requires drying. The study compares experimental results of TCL and slow pyrolysis for bio‑oil production from algae. TCL was carried out in a 1.8‑L Parr reactor with 80 % moisture algae slurry, whereas pyrolysis used an 8‑L cubical reactor with dried algal powder (~4 % moisture), and yields and compositions of bio‑oil, char, gases, and aqueous phase were evaluated. TCL achieved higher bio‑oil yields (~41 %) and lower char (~6.3 %) and energy consumption than pyrolysis (23–29 % bio‑oil, 28–40 % solids), and the TCL bio‑oil had higher energy density and better fuel properties.
Bio-oil is the liquid product of thermochemical liquefaction or pyrolysis of biomass. Thermochemical liquefaction (TCL) is a low temperature (250–350 °C) and high pressure (5–20 MPa) process particularly suited for high moisture feedstocks, whereas pyrolysis is accomplished at moderate to high temperatures (400–600 °C) and atmospheric pressure and requires drying of the feedstock. In this paper, we present experimental results that provide a critical comparison of TCL and slow pyrolysis processes for producing bio-oil from algae. TCL experiments were performed in a 1.8-L Parr reactor using algae slurry (80% moisture) and pyrolysis runs were carried out in an 8-L mild steel cubical reactor, using dried algal powder as received (∼4% moisture). Yields and composition of bio-oil, char, gases, and aqueous phase were evaluated and compared for TCL and pyrolysis. TCL resulted in higher bio-oil yields (∼41%), lower char yields (∼6.3%), and lower energy consumption ratio compared to pyrolysis, which resulted in 23–29% bio-oil, and 28–40% solids yields. Bio-oil obtained from TCL was found to have higher energy density and superior fuel properties such as thermal and storage stabilities, compared to pyrolysis bio-oil.
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Overview of Applications of Biomass Fast Pyrolysis Oil
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Life Sciences, Chemical Engineering, Mechanical Engineering +12