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Steam evacuation in pulp or fiber refiner

A fiber separator and refining technology, applied in pulp beating/refining method, fiber raw material, fiber raw material processing and other directions, can solve the problems of uneven material flow, affecting the flow of fiber material, affecting the stability of the refining gap, etc. Achieve less fiber build-up, less turbulence and losses

Active Publication Date: 2019-10-25
VALMET OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam flow through the refining space exhibits very high velocities and negatively affects the flow of fibrous material and also increases the energy consumption of the refiner
Steam can also flow in an irregular manner and thus affect the stability of the refining gap, making the material flow through the gap uneven

Method used

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  • Steam evacuation in pulp or fiber refiner
  • Steam evacuation in pulp or fiber refiner
  • Steam evacuation in pulp or fiber refiner

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] Throughout the drawings, the same reference numerals are used for similar or corresponding elements.

[0022] As mentioned in the background section, there is a continuing need in the art for further improvements in the removal of steam from the refining zone of a refiner.

[0023] figure 1 is a schematic diagram of a typical defibrator arrangement in a pulp or fiber refiner. Here, a defibrator with a rotor and stator arrangement is described, but this embodiment can also be applied in a defibrator with two rotors. Lignocellulose-containing material 7, such as wood chips, is fed through a conveying screw / feed screw 3a, usually a belt feeder, via a feed channel 3 towards the defibrator 1 and through holes in the stator 5 into the refining disc, i.e. the stator 5 and the intermediate space between the rotor 6. The centrifugal force pushes the material towards the periphery of the refining disc to emerge in the refining gap / space 2 between the refining surfaces of the r...

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PUM

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Abstract

A refining disc (6) in a defibrator (1) for refining fibrous material is provided with non-central openings (11) for allowing steam developed in the refining space (2) during refining to flow from thefront side to the backside of the refining disc (6), where the front side is facing a second refining disc (5) and the backside is facing away from the second refining disc (5). The refining disc (6)also comprises a central hole (12) for allowing steam (8b) to flow from the backside to the front side at the rotational center of the refining disc (6), and escape from the defibrator (1) backwardsthrough the feed screw (3a) without passing through the fibrous material (7) being refined in the refining space (2).

Description

technical field [0001] The present invention relates generally to the refining of fibrous material in pulp or fiber refiners, and in particular to the venting of steam generated during the refining process. Background technique [0002] A defibrator is a thermomechanical pulping refiner in which pulp material such as wood chips or other lignocellulose-containing fibrous material is ground in a steam environment between two refining discs, rotating grinding discs (rotors) with The fixed disks (stators) face each other, or alternatively, two rotating disks face each other to generate wood fibers. The refining discs are aligned along the pulp feed axis and the rotating disc is arranged on a rotatable axis which can be rotated relative to the other disc by means of eg an electric motor. The inner surfaces of the refining discs, ie the surfaces facing each other, are usually provided with one or more refining segments having refining bars and grooves of different sizes and orien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/30B02C7/12D21B1/14
CPCB02C7/12D21D1/30D21D1/306D21B1/14B02C7/06D21B1/22D21B1/26D21D1/008
Inventor K·伦格伦
Owner VALMET OY
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