Fuels derived from biomass feedstocks are a particularly attractive energy resource pathway given their inherent advantages of energy security via domestic fuel crop production and their renewable status. However, there are numerous questions regarding how to optimally produce, distribute, and utilize biofuels such that they are economically, energetically, and environmentally sustainable. Comparative analyses of two conceptual 2000 tons/day thermochemical-based biorefineries are performed to explore the effects of emerging technologies on process efficiencies. System models of the biorefineries, created using ASPEN Plus®, include all primary process steps required to convert a biomass feedstock into hydrogen, including gasification, gas cleanup and conditioning, hydrogen purification, and thermal integration. The biorefinery concepts studied herein are representative of “near-term” (approximately 2015) and “future” (approximately 2025) plants. The near-term plant design serves as a baseline concept and incorporates currently available commercial technologies for all nongasifier processes. Gasifier technology employed in these analyses is centered on directly heated, oxygen-blown, fluidized-bed systems that are pressurized to nearly 25 bars. The future plant design employs emerging gas cleaning and conditioning technologies for both tar and sulfur removal unit operations. A 25% increase in electric power production is observed for the future case over the baseline configuration due to the improved thermal integration while realizing an overall plant efficiency improvement of 2 percentage points. Exergy analysis reveals that the largest inefficiencies are associated with the (i) gasification, (ii) steam and power production, and (iii) gas cleanup and purification processes. Additional suggestions for improvements in the biorefinery plant for hydrogen production are given.
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March 2011
Research Papers
System Analysis of Thermochemical-Based Biorefineries for Coproduction of Hydrogen and Electricity
Robert J. Braun,
Robert J. Braun
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401
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Luke G. Hanzon,
Luke G. Hanzon
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401
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Jered H. Dean
Jered H. Dean
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401
Search for other works by this author on:
Robert J. Braun
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401
Luke G. Hanzon
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401
Jered H. Dean
Department of Engineering,
Colorado School of Mines
, Golden, CO 80401J. Energy Resour. Technol. Mar 2011, 133(1): 012601 (12 pages)
Published Online: March 29, 2011
Article history
Received:
August 4, 2010
Revised:
January 19, 2011
Online:
March 29, 2011
Published:
March 29, 2011
Citation
Braun, R. J., Hanzon, L. G., and Dean, J. H. (March 29, 2011). "System Analysis of Thermochemical-Based Biorefineries for Coproduction of Hydrogen and Electricity." ASME. J. Energy Resour. Technol. March 2011; 133(1): 012601. https://doi.org/10.1115/1.4003541
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