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Research Papers: Energy From Biomass

Residence Time Influence on the Fast Pyrolysis of Loblolly Pine Biomass

[+] Author and Article Information
J. Rhett Mayor1

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 813 Ferst Drive, Atlanta, GA 30332rhett.mayor@me.gatech.edu

Alexander Williams

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 813 Ferst Drive, Atlanta, GA 30332alexwilliams@gatech.edu

1

Corresponding author.

J. Energy Resour. Technol 132(4), 041801 (Jan 06, 2011) (6 pages) doi:10.1115/1.4003004 History: Received October 21, 2010; Revised November 04, 2010; Published January 06, 2011; Online January 06, 2011

Bio-oils were produced within a fast pyrolysis microreactor at 400°C from Pinus taeda (Loblolly pine) with varying residence times. This study has considered six residence times, evaluating the products of the reaction between 10 s and 120 s. The collected bio-oils and solids were analyzed for their calorific values and yields. Heating rates greater than 100°C/s were achieved, allowing for isothermal conditions throughout the majority of the reaction despite short residence times. The predictive capabilities of thermogravimetric analysis derived Arrhenius coefficients are evaluated and a new two component degradation model is empirically derived, showing a much improved representation of the fast pyrolysis process.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Isothermal fast pyrolysis microreactor schematic and process flow diagram

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Figure 2

Conversion results from residence time investigation mass balance with ±2 standard deviation error bars

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Figure 3

Experimental results for total product yield (oil and gas) and corresponding best fit half-life model

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Figure 4

Comparison of predicted mass conversion according to Arrhenius coefficients and measured mass conversion with two component half-life model curve fit on(a) a linear plot and (b) semilogarithmic plot

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Figure 5

Lower heating value results for bio-oils and solids compared with the unreacted pine feedstock

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