Upgrade of the Electroporation Device KEA-MOBIL
M. Sack, F. Attmann, R. Stängle, A. Wolf, W. Frey and G. Müller
Forschungszentrum Karlsruhe GmbH, Institut für Hochleistungsimpuls- und Mikrowellentechnik, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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For the production of synthetic bio fuel the use of green biomass enables additional resources of raw material supplementary to the commonly used dry material. An electroporation assisted drying process gives the opportunity of a more efficient dewatering than only pressing and subsequent drying. Experiments showed a lower relative humidity of the pressed material after electroporation compared to pressing the raw material only. Moreover, the drying process of the electroporated material was much shorter. This is because the pores formed in the cell membranes foster a better extraction of water during pressing and enhance the diffusion process during the drying process. The paper presents exemplarily the experimental results for green rye. For the electroporation assisted drying process the electric contact to the plant material has to be established by means of the juice inside the plants only rather than adding additional water. Hence, for experiments in larger scale, the existing electroporation device KEA MOBIL has been equipped with a new combined electroporation reactor and press. The reactor has a plate electrode system, whose upper electrode additionally serves as a piston to apply mechanical force to extract juice for a good electrical contact between plant material and the electrodes. A two stage Marx generator serves as a pulse source. To reduce the insulation distance to the walls of the shielding cabin the Marx generator is operated in ground symmetric configuration. The device has been designed for a batch wise throughput of 50 kg/h. An automatic feeding device enables the alternating use of two test vessels. The device has been tested on site on a farm with green rye and grass.
DOI: 10.12693/APhysPolA.115.1081
PACS numbers: 87.50.cj