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Introducing Renewable Electricity to increase Biogas Production Potential
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. (Energiprocesser, Energy Processes)ORCID iD: 0000-0002-0635-7372
2010 (English)In: International Conference on Applied Energy 2010, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Facing the challenge of CO2 reduction in the transport sector, the focus on alternative fuels has been growing rapidly. Several fuels and production methods have been proposed which illustrate various aspects of how to contribute to CO2 mitigation.This paper presents how biogas production from a given amount of biomass may be increased. To enhance biogas production, process improvements for today’s digestion process and also biogas produced from biomass gasification are suggested. Both biogas production via digestion and gasification of biomass produce CO2 as a by-product. To increase the biogas production, this green CO2 could be used to produce additional methane using the well-known Sabatier reaction. The hydrogen required for the reaction is proposed to originate from electrolysis of water, where the electricity needed is preferably produced from a renewable source, e.g. wind power. Reusing carbon in such manner reduces the need for fossil methane while supplying fuel to the transport sector.In this study, a base case scenario describing plants of typical sizes and efficiencies is presented for both digestion and gasification. It is shown that, using the Sabatier process on this base case, the methane production from gasification may be increased by about 140 %. For the digestion, the increase, including process improvements, is about 74 %. By using this method more biogas may be produced, without adding new raw material to the process. This would present a great way to meet society’s increasing demand for renewable fuels, while simultaneously reusing CO2.

Place, publisher, year, edition, pages
2010.
Keyword [en]
biogas, digestion, gasification, synthetic fuels, Sabatier reaction
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-29250OAI: oai:DiVA.org:kth-29250DiVA: diva2:392843
Conference
International Conference on Applied Energy 2010
Note

QC 20110128

Available from: 2011-01-28 Created: 2011-01-28 Last updated: 2016-08-16Bibliographically approved
In thesis
1. Turbomachinery in Biofuel Production
Open this publication in new window or tab >>Turbomachinery in Biofuel Production
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The aim for this study has been to evaluate the integration potential of turbo-machinery into the production processes of biofuels. The focus has been on bio-fuel produced via biomass gasification; mainly methanol and synthetic natural gas. The research has been divided into two parts; gas and steam turbine applications.

Steam power generation has a given role within the fuel production process due to the large amounts of excess chemical reaction heat. However, large amounts of the steam produced are used within the production process and is thus not available for power production. Therefore, this study has been focused on lowering the steam demand in the production process, in order to increase the power production. One possibility that has been evaluated is humidification of the gasification agent in order to lower the demand for high quality steam in the gasifier and replace it with waste heat. The results show that the power penalty for the gasification process could be lowered by 18-25%, in the specific cases that have been studied.

Another step in the process that requires a significant amount of steam is the CO2-removal. This step can be avoided by adding hydrogen in order to convert all carbon into biofuel. This is also a way to store hydrogen (e.g. from wind energy) together with green carbon. The results imply that a larger amount of sustainable fuels can be produced from the same quantity of biomass.

The applications for gas turbines within the biofuel production process are less obvious. There are large differences between the bio-syngas and natural gas in energy content and combustion properties which are technical problems when using high efficient modern gas turbines. This study therefore proposes the integration of a natural gas fired gas turbine; a hybrid plant. The heat from the fuel production and the heat recovery from the gas turbine flue gas are used in a joint steam cycle. Simulations of the hybrid cycle in methanol production have shown good improvements. The total electrical efficiency is increased by 1.4-2.4 percentage points, depending on the fuel mix. The electrical efficiency for the natural gas used in the hybrid plant is 56-58%, which is in the same range as in large-scale combined cycle plants. A bio-methanol plant with a hybrid power cycle is consequently a competitive production route for both biomass and natural gas.

Place, publisher, year, edition, pages
Stockholm: KTH, 2011. iv, 39 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2011:2
Keyword
Bio-Methanol, Biomass, Gasification, Humidification, Hybrid Cycle, SNG
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-28901 (URN)978-91-7415-835-9 (ISBN)
Presentation
2011-01-21, V3, Teknikringen 76, 2 tr, KTH, Stockholm, 13:00 (Swedish)
Opponent
Supervisors
Note
QC 20110128Available from: 2011-01-28 Created: 2011-01-24 Last updated: 2011-01-28Bibliographically approved

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