Development and Test of a new Concept for Biomass Producer Gas Engines

Jesper Ahrenfeldt, Esben Vendelbo Foged, Rune Strand, Ulrik Birk Henriksen

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    The technical requirements and the economical assessment of converting commercial diesel engine gen-sets into high compression spark ignition operation on biomass producer gas have been investigated. Assessments showed that for a 200 kWe gen-set there would be a financial benefit of approximately 600.000 DKK corresponding to a reduction of 60% in investment costs compared to the price of a conventional gas engine gen-set. Experimental investigations have been conducted on two identical small scale SI gas engine gen-sets operating on biomass producer gas from thermal gasification of wood. The engines were operated with two different compression ratios, one with the original compression ratio for natural gas operation 9.5:1, and the second with a compression ratio of 18.5:1 (converted diesel engine). It was shown that high compression ratio SI engine operation was possible when operating on this specific biomass producer gas. The results showed an increase in the electrical efficiency from 30% to 34% when the compression ratio was increased.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages35
    ISBN (Print)978-87-550-3811-0
    Publication statusPublished - 2010
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Bio systems
    • Thermal gasification of biomass
    • Risø-R-1728
    • Risø-R-1728(EN)


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