Pre-treatment of Biomass By Rolling - A Combined Experimental and Numerical Analysis

Klaus Schütt Hansen, Christian Ravn, Emil Krabbe Nielsen, T. Koch, C. Porte, Peter Christiansen, Anette Alsted Rasmussen, Niels Oluf Bay

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Pre-treatment of bulk straw material by rolling is studied as a possible method to prepare for subsequent biogas production. A combined experimental and theoretical study is presented. A pilot rolling mill with a double screw feeder is designed and constructed for crushing of bulk straw. Experiments show that the roll speed and the roll reduction should be chosen within a specific range depending on the injection screw speed to avoid blocking or insufficient compaction. A mechanical testing procedure of the bulk straw material including closed die compaction testing as well as simple upsetting of pre-compacted billets of straw is carried out based on which a mathematical model for the yield surface is determined fitting to a geological cap model for porous material similar to the Drucker-Prager spherical cap model. An experimental test campaign is carried out to determine the feasible process window for pre-treatment of wheat straw by roll pressing varying the feed, the roll gap, the roll speed and the moisture content of the bulk straw.
Original languageEnglish
Title of host publicationProceedings of 25th European Biomass Conference and Exhibition
Publication date2017
Pages492 - 499
ISBN (Print)978-88-89407-17-2
Publication statusPublished - 2017
Event25th European Biomass Conference and Exhibition - Stockholmsmässan, Stockholm, Sweden
Duration: 12 Jun 201715 Jun 2017


Conference25th European Biomass Conference and Exhibition


  • Pre-treatment of biomass
  • Roll pressing of straw
  • Process window


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