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Title: Utilizing stillage in the biorefinery: Economic, technological and energetic analysis

Abstract

The goal of this study is to evaluate the economics and energy efficiency of different biorefinery configurations which include stillage valorization strategies for bioproducts synthesis. Specifically, a mixed-integer nonlinear programming (MINLP) model is developed to identify the optimal process network, and the impact of various parameters (e.g., bioproduct selling price, production cost, and energy requirement) on the performance of the biorefinery is investigated. Results show that the optimal strategy leading to a minimum ethanol selling price of $${$$}$3.44/GGE includes γ-valerolactone deconstruction, glucose and xylose co-fermentation, heat and power generation, and does not include stillage valorization. Economic analyses indicate that the stillage valorization becomes economically viable at bioproduct selling prices above $${$$}$2.0/kg for a base unit production cost and conversion coefficient of $${$$}$2.0/kg bioproduct and 0.3 kg bioproduct/kg sugars, respectively. Further studies imply that under certain scenarios, the biorefinery does not generate sufficient energy if all stillage is utilized for bioproducts production. Thus, the utilization of stillage has to be optimized in order to achieve an energy self-sufficient biorefinery. Finally, analyses are performed to study how improvements in combinations of parameters can lead to lower cost and higher energy efficiency.

Authors:
 [1];  [1]; ORCiD logo [1];  [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States); USDOE Great Lakes Bioenergy Research Center, Madison, WI (United States)
Publication Date:
Research Org.:
USDOE Great Lakes Bioenergy Research Center, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1548299
Grant/Contract Number:  
SC0018409
Resource Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 241; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Cellulosic biofuels; Optimization; Superstructure; Stillage valorization; Process synthesis; Bioproducts

Citation Formats

Ng, Rex T. L., Fasahati, Peyman, Huang, Kefeng, and Maravelias, Christos T. Utilizing stillage in the biorefinery: Economic, technological and energetic analysis. United States: N. p., 2019. Web. doi:10.1016/j.apenergy.2019.03.020.
Ng, Rex T. L., Fasahati, Peyman, Huang, Kefeng, & Maravelias, Christos T. Utilizing stillage in the biorefinery: Economic, technological and energetic analysis. United States. doi:10.1016/j.apenergy.2019.03.020.
Ng, Rex T. L., Fasahati, Peyman, Huang, Kefeng, and Maravelias, Christos T. Wed . "Utilizing stillage in the biorefinery: Economic, technological and energetic analysis". United States. doi:10.1016/j.apenergy.2019.03.020. https://www.osti.gov/servlets/purl/1548299.
@article{osti_1548299,
title = {Utilizing stillage in the biorefinery: Economic, technological and energetic analysis},
author = {Ng, Rex T. L. and Fasahati, Peyman and Huang, Kefeng and Maravelias, Christos T.},
abstractNote = {The goal of this study is to evaluate the economics and energy efficiency of different biorefinery configurations which include stillage valorization strategies for bioproducts synthesis. Specifically, a mixed-integer nonlinear programming (MINLP) model is developed to identify the optimal process network, and the impact of various parameters (e.g., bioproduct selling price, production cost, and energy requirement) on the performance of the biorefinery is investigated. Results show that the optimal strategy leading to a minimum ethanol selling price of ${$}$3.44/GGE includes γ-valerolactone deconstruction, glucose and xylose co-fermentation, heat and power generation, and does not include stillage valorization. Economic analyses indicate that the stillage valorization becomes economically viable at bioproduct selling prices above ${$}$2.0/kg for a base unit production cost and conversion coefficient of ${$}$2.0/kg bioproduct and 0.3 kg bioproduct/kg sugars, respectively. Further studies imply that under certain scenarios, the biorefinery does not generate sufficient energy if all stillage is utilized for bioproducts production. Thus, the utilization of stillage has to be optimized in order to achieve an energy self-sufficient biorefinery. Finally, analyses are performed to study how improvements in combinations of parameters can lead to lower cost and higher energy efficiency.},
doi = {10.1016/j.apenergy.2019.03.020},
journal = {Applied Energy},
number = C,
volume = 241,
place = {United States},
year = {2019},
month = {3}
}

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