Enviro-economic assessment of thermochemical polygeneration from microalgal biomass

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Title: Enviro-economic assessment of thermochemical polygeneration from microalgal biomass
Authors: Graciano, JEA
Chachuat, B
Alves, RMB
Item Type: Journal Article
Abstract: This paper presents a model-based assessment of the thermochemical conversion of microalgal biomass into Fischer-Tropsch liquids, hydrogen and electricity through polygeneration. Two novel conceptual plants are investigated, which are both comprised of the same operation units (gasification, water-gas shift, Fischer-Tropsch synthesis, upgrading, separation, Rankine cycle and gas turbines) and mainly differ in the location of the water-gas-shift unit. Both plants are found to present a carbon efficiency greater than conventional biomass-to-liquid processes. The most profitable plants in terms of the saleable products yields ca. 0.23 m3 (1.4 bbl) of liquid transportation fuels (gasoline, kerosene and diesel), ca. 16 kg of hydrogen (716.8 scm), and ca. 1.55 × 109 J (430 kW·h) of electricity per 1000 kg of dried microalgae. The corresponding displaced fossil fuels could offset the carbon emissions by 0.56 kg of carbon dioxide for every kg of processed dried microalgae. Nevertheless, predicted break-even prices are lower than 40 USD per ton of dried microalgae in the base case scenario, which is at least 10 times cheaper than the current best scenario for microalgal biomass production. These low prices are a major impediment to the viability of these thermochemical polygeneration plants, albeit presenting a good potential toward cleaner liquid fuel production.
Issue Date: 1-Dec-2018
Date of Acceptance: 21-Aug-2018
URI: http://hdl.handle.net/10044/1/63793
DOI: https://dx.doi.org/10.1016/j.jclepro.2018.08.227
ISSN: 0959-6526
Publisher: Elsevier
Start Page: 1132
End Page: 1142
Journal / Book Title: Journal of Cleaner Production
Volume: 203
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: BG International Limited
Engineering & Physical Science Research Council (E
Funder's Grant Number: PO 4513104531
CCR10900 - IRIS 130635/54
Keywords: 0907 Environmental Engineering
0910 Manufacturing Engineering
0915 Interdisciplinary Engineering
Environmental Sciences
Publication Status: Published
Online Publication Date: 2018-08-24
Appears in Collections:Faculty of Engineering
Chemical Engineering

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