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Bio-DME production based on conventional and CO2-enhanced gasification of biomass: A comparative study on exergy and environmental impacts
Parvez, A.M. Wu, T. Li, S. Miles, N.
Parvez, A.M.
Wu, T.
Li, S.
Miles, N.
Publication Date
2018-03
End of Embargo
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© 2018 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
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Yes
Open Access status
Accepted for publication
2018-01-22
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Abstract
In this study, a novel single-step synthesis of dimethyl ether (DME) based on CO2-enhanced biomass gasification was proposed and simulated using ASPEN PlusTM modelling. The exergetic and environmental evaluation was performed in comparison with a conventional system. It was found that the fuel energy efficiency, plant energy efficiency and plant exergetic efficiency of the CO2-enhanced system were better than those of the conventional system. The novel process produced 0.59 kg of DME per kg of gumwood with an overall plant energy efficiency of 65%, which were 28% and 5% higher than those of conventional systems, respectively. The overall exergetic efficiency of the CO2-enhanced system was also 7% higher. Exergetic analysis of each individual process unit in both the CO2-enhanced system and conventional systems showed that the largest loss occurred at gasification unit. However, the use of CO2 as gasifying agent resulted in a reduced loss at gasifier by 15%, indicating another advantage of the proposed system. In addition, the LCA analysis showed that the use of CO2 as gasifying agent could also result in less 21 environmental impacts compared with conventional systems, which subsequently made the CO2-22 enhanced system a promising option for a more environmental friendly synthesis of bio-DME.
Version
Accepted Manuscript
Citation
Parvez AM, Wu T, Li S et al (2018) Bio-DME production based on conventional and CO2-enhanced gasification of biomass: A comparative study on exergy and environmental impacts. Biomass and Bioenergy. 110: 105-113.
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Article