Förnybar Naturgas-Förgasning av biomassa för framställning av syntetisk naturgas 2005 (Swedish)Independent thesis Basic level (degree of Bachelor)Student thesis

Abstract [sv]

The natural gas grid in Sweden will get extended to give the possibility to replace oil and coal within the industry, build effective combined powerheat plants and offer the transportation sector an ecofriendly alternative to diesel and petrol. Through extension of the Swedish gas grid there will also be an infrastructure for distribution of other gases than natural gas. Natural gas is a fossil fuel and in this report the possibility of gasifying biomass to produce a synthetic natural gas (SNG) that could be distributed on the existing natural gas grid. Also a combined production of SNG and Fischer- Tropsch (FT) fuels has been investigated. In this report the raw material potential in the south of Sweden has been investigated, gasifying technologies have been investigated, demands for distribution on the natural gas grid, proposals of suitable localization alternatives and the total gas/FT -fuels potential has been estimated. The biggest potential of raw material is within the forestry in the form of fell remains and stem wood from thinning. In the future there will also be a great potential in waste because of the law about prohibiting deposits on landfills. The future potential of biomass is estimated to 34 TWh. There are several techniques for gasification of biomass to produce SNG and FT -fuels. When producing SNG separate the indirect gasifier using steam and subsequent methanation is the best alternative due to the highest efficiency. When using combined production of SNG and FT –fuels the integrated co-production is a good choice. To be allowed to distribute SNG on the Swedish gas grid some demands has to be fulfilled. Heating value and wobbeindex must correspond to the natural gas, a similar composition of the gas has to be reached, for example a similar methane content. Another alternative are distribution in separate grids. A good location to build a gasifying plant is nearby the gas grid, with good acces to raw material and somewhere to use the waste heat. If all available raw material should be used for separate production of SNG the gas should come up to 23TWh, and combined 18TWh SNG and 6TWh FT –fuels. It is not reasonable that all the raw material is available for production of SNG and FT –fuels. The report has shown that there is a good technical possibility to distribute SNG from gasification in to the natural gas grid, but economically there will be a need for investors who believes in the technique and probably support from the government.

Place, publisher, year, edition, pages

2005.

Keywords [sv]

SNG, Naturgas, Gas, Syntetisk naturgas, FT-bränsle

Identifiers

URN: urn:nbn:se:hh:diva-13016Local ID: U12086OAI: oai:DiVA.org:hh-13016DiVA, id: diva2:368185

Uppsok

Technology

Note

Denna uppsats kan beställas från arkivet / This paper can be ordered from the archive. Kontakta / Contact: arkivet@hh.seAvailable from: 2010-11-09 Created: 2010-11-09Bibliographically approved

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School of Business and Engineering (SET)

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