Method And Device For Drying A Flow Of Biomass Particles
First Claim
1. A system for drying a flow of biomass particles, the system comprising:
- a dryer (101) adapted to receive a flow of wet biomass particles (105) and to dry the flow of wet biomass particles (105) using a gaseous drying medium,wherein said dryer (101) comprises at least one ultrasound device (301) or is in connection with at least one ultrasound device (301), characterized in that said at least one ultrasound device (301) is adapted, during use, to supply at least a part, of said gaseous drying medium to said flow of wet biomass particles (105) and where said at least one ultrasound device (301), during use, removes or minimizes a laminar sub-layer (313) being present at the surface of said wet biomass particles (105) and in that said at least one ultrasound device (301) is activated by at least a part of the gaseous drying medium.
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Accused Products
Abstract
A method and a system to be used in the process of manufacturing plates, such as fibreboards, particleboards and the like boards, where the raw material in the form of biomass particles, such as wood fibres or wood particles of various size and shape are dried from its natural moisture content to a moisture content suitable to be applied with a thermosetting binder and be spread onto a movable forming belt to form a mat, and where said mat by means of a hot press is compressed into the desired thickness of the finished plate and the thermosetting binder is hardened. According to the invention, the drying process of the biomass particles is facilitated by the use of ultrasound to remove the sub-layer of air at the surface of the particles and thus to intensify the transport of heat energy into the particles and the transport of moisture from the particles.
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Citations
20 Claims
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1. A system for drying a flow of biomass particles, the system comprising:
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a dryer (101) adapted to receive a flow of wet biomass particles (105) and to dry the flow of wet biomass particles (105) using a gaseous drying medium, wherein said dryer (101) comprises at least one ultrasound device (301) or is in connection with at least one ultrasound device (301), characterized in that said at least one ultrasound device (301) is adapted, during use, to supply at least a part, of said gaseous drying medium to said flow of wet biomass particles (105) and where said at least one ultrasound device (301), during use, removes or minimizes a laminar sub-layer (313) being present at the surface of said wet biomass particles (105) and in that said at least one ultrasound device (301) is activated by at least a part of the gaseous drying medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
where said ultrasound device (301) is adapted to receive a pressurized gas and pass the pressurized gas to said opening (302), from which the pressurized gas is discharged in a jet towards the cavity (304).
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7. A system according to claim 1, characterized in that said flow of biomass particles is an airborne flow of fibres.
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8. A system according to claim 1, characterized in that said flow of biomass particles is a mechanically activated flow of biomass particles usable for traditional particleboards, strands for OSB (Oriented Strand Boards) or the like.
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9. A system according to claim 1, characterized in that said dryer (101) comprises a plurality of ultrasound devices (301) for supplying at least a part of said gaseous medium.
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10. A system according to claim 1, characterized in that at least one of said at least one ultrasound devices (301) generates ultrasound at a sound pressure selected from the group of:
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approximately 135 dB or higher, approximately 140 dB or higher, approximately 150 dB or higher, approximately 160 dB or higher
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20. A method according to claim 1, characterized in that at least one of said at least one ultrasound devices (301) generates ultrasound at a sound pressure selected from the group of:
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approximately 135 dB or higher, approximately 140 dB or higher, approximately 150 dB or higher, approximately 160 dB or higher.
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11. A method of drying a flow of biomass particles, the method comprising the step of:
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drying a received flow of wet biomass particles (105) using a gaseous drying medium, characterized in that said step of drying comprises supplying at least a part of said gaseous drying medium to said flow of wet biomass particles (105) using at least one ultrasound device (301), where said at least one ultrasound device (301), during use, removes or minimizes a laminar sub-layer (313) being present at the surface of said wet biomass particles (105) and, in that said at least one ultrasound device (301) is activated by at least a part of the gaseous drying medium. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
where said ultrasound device (301) is adapted to receive a pressurized gas and pass the pressurized gas to said opening (302), from which the pressurized gas is discharged in a jet towards the cavity (304).
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17. A method according to claim 11, characterized in that said flow of biomass particles is an airborne flow of fibres.
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18. A method according to claim 11, characterized in that said flow of biomass particles is a mechanically activated flow of biomass particles usable for traditional particleboards, strands for OSB (Oriented Strand Boards) or the like.
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19. A method according to claim 11, characterized in that said dryer (101) comprises a plurality of ultrasound devices (301) for supplying at least a part of said gaseous medium.
Specification