Bay, Niels Oluf

Christiansen, Peter

Hansen, Klaus Schütt

Koch, T.

Nielsen, Emil Krabbe

Porte, C.

Rasmussen, Anette Alsted

Ravn, Christian

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

Online Research Database In Technology

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

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

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Online Research Database In Technology