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Biofuel production with CCS as a strategy for creating a CO2-neutral road transport sector
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2009 (English)In: 9th International Conference on Greenhouse Gas Control Technologies, GHGT-9: Washington DC; 16 November 2008 through 20 November 2008 / [ed] Gale J.; Herzog H.; Braitsch J., 2009, 4111-4118 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, three biofuel-producing processes with carbon dioxide capture and storage (CCS) are studied: two (fermentation) ethanol processes and one process producing methanol (via gasification). In these processes CO2 is captured from streams which are relatively pure, i.e. the main impurity is water vapour which may be easily removed. Owing to this, the costs for CO2 capture, both in terms of economic cost and energy penalty, are very low and these processes could thus constitute some of the first instances where CCS is implemented. The paper highlights under which conditions biofuel production with CCS may create a CO2-neutral transport sector.

Place, publisher, year, edition, pages
2009. 4111-4118 p.
Series
Energy Procedia, ISSN 1876-6102 ; Vol. 1 : issue 1
Keyword [en]
Biofuel; biomass potential; carbon dioxide capture and storage; CO2-neutral; ethanol; methanol; security of supply; Sweden; transport
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9366DOI: 10.1016/j.egypro.2009.02.219ISI: 000276074404017Scopus ID: 2-s2.0-67650109062OAI: oai:DiVA.org:kth-9365DiVA: diva2:113646
Note
QC 20100823Available from: 2008-10-23 Created: 2008-10-23 Last updated: 2010-08-23Bibliographically approved
In thesis
1. A trinity of sense: Using biomass in the transport sector for climate change mitigation
Open this publication in new window or tab >>A trinity of sense: Using biomass in the transport sector for climate change mitigation
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis analyses two strategies for decreasing anthropogenic carbon dioxide (CO2) emissions: to capture and store CO2, and to increase the use of biomass. First, two concepts for CO2 capture with low capture penalties are evaluated. The concepts are an integrated gasification combined cycle where the oxygen is supplied by a membrane reactor, and a hybrid cycle where the CO2 is captured at elevated pressure. Although the cycles have comparatively high efficiencies and low penalties, they illustrate the inevitable fact that capturing CO2 will always induce significant efficiency penalties. Other strategies are also needed if CO2 emissions are to be forcefully decreased. An alternative is increased use of biomass, which partially could be used for production of motor fuels (biofuels). This work examines arguments for directing biomass to the transport sector, analyses how biofuels (and also some other means) may be used to reduce CO2 emissions and increase security of motor fuel supply. The thesis also explores the possibility of reducing CO2 emissions by comparatively easy and cost-efficient CO2 capture from concentrated CO2 streams available in some types of biofuel plants. Many conclusions of the thesis could be associated with either of three meanings of the word sense: First, there is reason in biofuel production – since it e.g. reduces oil dependence. From a climate change mitigation perspective, however, motor fuel production is often a CO2-inefficient use of biomass, but the thesis explores how biofuels’ climate change mitigation effects may be increased by introducing low-cost CO2 capture. Second, the Swedish promotion of biofuels appears to have been governed more by a feeling for attaining other goals than striving for curbing climate change. Third, it seems to have been the prevalent opinion among politicians that the advantages of biofuels – among them their climate change mitigation benefits – are far greater than the disadvantages and that they should be promoted. Another conclusion of the thesis is that biofuels alone are not enough to drastically decrease transport CO2 emissions; a variety of measures are needed such as fuels from renewable electricity and improvements of vehicle fuel economy.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 68 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:62
Keyword
Biofuel, biomass, carbon dioxide capture and storage, energy systems, ethanol, hybrid cycle, mixed conducting membrane reactor, pressurized fluidized bed combustion, Sweden, transport
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-9292 (URN)978-91-7415-107-7 (ISBN)
Public defence
2008-11-07, F3, KTKH, Lindstedtsvägen 26, Stockholm, 13:30 (English)
Opponent
Supervisors
Note
QC 20100823Available from: 2008-10-22 Created: 2008-10-16 Last updated: 2010-08-23Bibliographically approved

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