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Steam venting in pulp or fiber refiners

A fiber separator and fine grinding technology, which is applied in pulp beating/refining methods, fiber raw materials, fiber raw material processing, etc., can solve the problems of increasing the energy consumption of the refiner, affecting the flow of fiber materials, and uneven material flow.

Active Publication Date: 2020-10-30
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 venting in pulp or fiber refiners
  • Steam venting in pulp or fiber refiners
  • Steam venting in pulp or fiber refiners

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

The refining disc (6) in the defibrator (1) for refining fibrous material is provided with a non-central opening (11) for allowing steam generated in the refining space (2) during refining to escape from the refining disc The front side of (6) flows to the rear side, wherein the front side faces the second refining disc (5) and the rear side faces away from the second refining disc (5). The refining disc (6) also includes a central hole (12) for allowing the steam (8b) to flow from the rear side to the front side at the center of rotation of the refining disc (6) and back to separate from the fibers by the feed screw (3a) The machine (1) escapes without passing through the fibrous material (7) 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 Patents(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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