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Title: Improving bioenergy feedstock quality of high moisture short rotation woody crops using air classification

Abstract

Short rotation woody crops have many advantages as perennial bioenergy feedstocks, including high biomass yields, high carbohydrate and low ash contents, and marginal land utilization. Through short rotation coppicing management, these biomass resources can be harvested year round. The challenge of year round harvesting is feedstock quality variability due to leaf content during periods of non-senescence. The low quality leaf fraction results in higher ash and moisture contents and lower carbohydrate content. Mechanical techniques, such as air classification, provide an economically feasible process to separate heterogeneous biomass samples based on particle density, size, and shape. In this work high moisture (>45%) hybrid poplar and shrub willow short rotation crops were air classified using a series of fan speeds for anatomical fractionation of the material. Air classification using an air velocity of ~4.7 m/s removed a majority of the leaf material while retaining 88% and 87% of the hybrid poplar and shrub willow, respectively. At this velocity, the ash content was reduced from 2.34% to 1.67% for hybrid poplar and 2.60% to 2.14% for shrub willow. Concurrently, the carbohydrate content increased from 56.32% to 60.62% and from 54.03% to 55.99% for these same materials. As drying is a cost intensive stepmore » for processing high moisture biomass materials, the cost benefits (~$3/Mg dry biomass) for removing low quality, high moisture materials prior to drying were also demonstrated.« less

Authors:
ORCiD logo; ; ORCiD logo; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
OSTI Identifier:
1461614
Alternate Identifier(s):
OSTI ID: 1770760
Report Number(s):
INL/JOU-18-44407-Rev000
Journal ID: ISSN 0961-9534; S0961953418301855; PII: S0961953418301855
Grant/Contract Number:  
AC07-05ID14517; EE0006638
Resource Type:
Published Article
Journal Name:
Biomass and Bioenergy
Additional Journal Information:
Journal Name: Biomass and Bioenergy Journal Volume: 117 Journal Issue: C; Journal ID: ISSN 0961-9534
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English
Subject:
09 BIOMASS FUELS; hybrid poplar; shrub willow; air classification; leaf removal; biomass quality; ash reduction

Citation Formats

Emerson, Rachel M., Hernandez, Sergio, Williams, C. Luke, Lacey, Jeffrey A., and Hartley, Damon S.. Improving bioenergy feedstock quality of high moisture short rotation woody crops using air classification. United Kingdom: N. p., 2018. Web. https://doi.org/10.1016/j.biombioe.2018.07.015.
Emerson, Rachel M., Hernandez, Sergio, Williams, C. Luke, Lacey, Jeffrey A., & Hartley, Damon S.. Improving bioenergy feedstock quality of high moisture short rotation woody crops using air classification. United Kingdom. https://doi.org/10.1016/j.biombioe.2018.07.015
Emerson, Rachel M., Hernandez, Sergio, Williams, C. Luke, Lacey, Jeffrey A., and Hartley, Damon S.. Mon . "Improving bioenergy feedstock quality of high moisture short rotation woody crops using air classification". United Kingdom. https://doi.org/10.1016/j.biombioe.2018.07.015.
@article{osti_1461614,
title = {Improving bioenergy feedstock quality of high moisture short rotation woody crops using air classification},
author = {Emerson, Rachel M. and Hernandez, Sergio and Williams, C. Luke and Lacey, Jeffrey A. and Hartley, Damon S.},
abstractNote = {Short rotation woody crops have many advantages as perennial bioenergy feedstocks, including high biomass yields, high carbohydrate and low ash contents, and marginal land utilization. Through short rotation coppicing management, these biomass resources can be harvested year round. The challenge of year round harvesting is feedstock quality variability due to leaf content during periods of non-senescence. The low quality leaf fraction results in higher ash and moisture contents and lower carbohydrate content. Mechanical techniques, such as air classification, provide an economically feasible process to separate heterogeneous biomass samples based on particle density, size, and shape. In this work high moisture (>45%) hybrid poplar and shrub willow short rotation crops were air classified using a series of fan speeds for anatomical fractionation of the material. Air classification using an air velocity of ~4.7 m/s removed a majority of the leaf material while retaining 88% and 87% of the hybrid poplar and shrub willow, respectively. At this velocity, the ash content was reduced from 2.34% to 1.67% for hybrid poplar and 2.60% to 2.14% for shrub willow. Concurrently, the carbohydrate content increased from 56.32% to 60.62% and from 54.03% to 55.99% for these same materials. As drying is a cost intensive step for processing high moisture biomass materials, the cost benefits (~$3/Mg dry biomass) for removing low quality, high moisture materials prior to drying were also demonstrated.},
doi = {10.1016/j.biombioe.2018.07.015},
journal = {Biomass and Bioenergy},
number = C,
volume = 117,
place = {United Kingdom},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.biombioe.2018.07.015

Citation Metrics:
Cited by: 1 work
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