Optimization of a free-fall reactor for the production of fast pyrolysis bio-oil |
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Authors: | Ellens C J Brown R C |
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Institution: | a Department of Mechanical Engineering, Iowa State University (ISU), Ames, IA, USA b Avello Bioenergy, Inc., Des Moines, IA, USA c Center for Sustainable Environmental Technologies, Ames, IA, USA |
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Abstract: | A central composite design of experiments was performed to optimize a free-fall reactor for the production of bio-oil from red oak biomass. The effects of four experimental variables including heater set-point temperature, biomass particle size, sweep gas flow rate and biomass feed rate were studied. Heater set-point temperature ranged from 450 to 650 °C, average biomass particle size from 200 to 600 μm, sweep gas flow rate from 1 to 5 sL/min and biomass feed rate from 1 to 2 kg/h. Optimal operating conditions yielding over 70 wt.% bio-oil were identified at a heater set-point temperature of 575 °C, while feeding red oak biomass sized less than 300 μm at 2 kg/h into the 0.021 m diameter, 1.8 m tall reactor. Sweep gas flow rate did not have significant effect on bio-oil yield over the range tested. |
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Keywords: | Fast pyrolysis Free-fall reactor Bio-oil Biomass Optimization |
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