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Energy Efficient Fibrillation of Cellulose Fibers using an Ultrasound Reactor
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0002-4657-6844
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0003-2955-2776
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The pulp and paper industry is in continuous need for energy-efficient production processes. Therefore, there is a focus in reducing electrical energy use in the production of paper.  The most energy demanding processes are related to fibrillation, which in some cases use up to 80% of required electrical power, with a net efficiency of 1%. The presented work focus on ultrasound controlled cavitation in concentrating the processing energy to provide an energy efficient development of cellulose fibers. The objectives are to develop a scalable cavitation reactor to obtain energy-efficient fibrillation of cellulose fibers aiming at reducing the energy use by 50%. Our goal is to develop a methodology based on multiphysic simulation for the design of an alternative refiner based on ultrasound cavitation. The reactor concept is of a flow through type where cavitation bubbles are initiated in the fiber suspension by the pressure release when the pulp flow through a venturi nozzle. The induced cavitation bubbles are collapsed by high intensity ultrasound at resonant frequencies. The collapsing bubbles and their associated shock waves modify the fiber wall properties which enables fibrillation.  Energy efficient fibrillation of cellulose fibers is therefore possible to achieve through an optimized combination of hydrodynamic and ultrasonic controlled cavitation. Initial results shows a positive effect on fiber quality. However, further optimization of process parameters like temperature and static pressure is required.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Ultrasonic cavitation, Hydrodynamic cavitation, Cellulose fibers, Ultrasound reactor
National Category
Fluid Mechanics and Acoustics Paper, Pulp and Fiber Technology
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-76708OAI: oai:DiVA.org:ltu-76708DiVA, id: diva2:1370331
Conference
Marcus Wallenberg Prize (MWP) Event 2019 – Young Researchers’ Challenge; October 6–9, 2019, Stockholm, Sweden
Funder
Swedish Energy Agency, 166518Available from: 2019-11-14 Created: 2019-11-14 Last updated: 2019-11-27

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Pamidi, Taraka Rama KrishnaJohansson, ÖrjanLöfqvist, Torbjörn
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CiteExportLink to record
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