Apparatus for washing and/or dewatering of cellulose pulp

Patent metadata

Field	Value
Publication number	US-9598818-B2
Application number	US-201314650781-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Jan 11, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

Apparatus for washing and/or dewatering cellulose pulp is disclosed including a movable permeable surface in a pulp transportation chamber having a chamber gap above the movable permeable surface, a pulp distributor for distributing pulp onto the movable permeable surface, a throttle having a throttle gap width and an adjustable throttle adjuster to remotely adjust the throttle gap width so that a volume of pulp flow into the pulp distributor is equal to or greater than the volume of pulp flow out of the distributor during operation.

First claim

The invention claimed is:

1. Apparatus for washing and/or dewatering cellulose pulp comprising a first movable permeable surface traveling in a first direction, a pulp transportation chamber wall adjacent to said first movable permeable surface, sized to provide a pulp transportation chamber having a chamber gap between said pulp transportation chamber wall and said first movable permeable surface, a pulp distribution member comprising an inlet and an outlet arranged for distributing said pulp through said outlet onto said movable permeable surface, a moveable throttle adjacent to said outlet of said pulp distribution member in said first direction, said moveable throttle having a throttle gap width, a portion of said first movable permeable surface adjacent to said outlet of said pulp distribution member comprising a second permeable surface for initially dewatering said pulp moving in said first direction before said moveable throttle, said second permeable surface being sufficiently large so as to begin forming and dewatering said pulp before said moveable throttle, and an adjustable throttle member for remotely adjusting said throttle gap width, said throttle gap width being adapted whereby said pulp volume flow into said pulp distribution member is equal to or greater than said pulp volume flow out of said pulp distribution member during operation.

2. Apparatus according to claim 1 wherein said pulp distribution member includes web means for forming said pulp into a pulp web on said first movable permeable surface.

3. Apparatus according to claim 1 wherein said throttle gap width is adapted so that said pulp distribution member remains substantially full during operation.

4. Apparatus according to claim 1 wherein said throttle gap width is adapted so that an internal pressure is created inside said pulp distribution member during operation.

5. Apparatus according to claim 1 wherein said pulp transportation chamber wall includes said movable throttle for adjusting said throttle gap width.

6. Apparatus according to claim 5 wherein said movable throttle comprises at least one longitudinal segment.

7. Apparatus according to claim 5 wherein said movable throttle comprises a flexible or pivotable plate.

8. Apparatus according to claim 5 wherein said movable throttle includes a clearance after said movable throttle in said first direction.

9. Apparatus according to claim 5 including moving means for moving said movable throttle.

10. Apparatus according to claim 9 wherein said moving means is selected from the group consisting of at least one rod, at least one plate, and at least on eccentric puck disposed on a shaft.

11. Apparatus according to claim 1 including an exchangeable member for determining said throttle gap width.

12. Apparatus according to claim 11 wherein said exchangeable member comprises a predetermined number of shims.

13. Apparatus according to claim 1 including automatic control means for controlling said throttle gap width based upon at least one parameter.

14. Apparatus according to claim 13 wherein said at least one parameter is selected from the group consisting of the filling level of said pulp distribution member, the pressure in said pulp distribution member, the ratio between the pulp volume flow into said pulp distribution member, and the pulp volume flow out of said pulp distribution member, the temperature in said pulp distribution member, the pressure in said pulp distribution chamber, and the pulp level in the ends of said first permeable surface.

15. The apparatus according to claim 1 wherein said first movable permeable surface comprises a first rotatable permeable surface of a press roll.

Assignees

• Valmet Oy

Inventors

• Lööf Tobias
• Pettersson Patrik
• Orgård Jonas
• Lövgren Hans
• Wallin Per
• Nykvist Peter
• Magnusson Jonas

Classifications

• D21F1/02

  Head boxes of Fourdrinier machines · CPC title

• D21C9/06 Primary

  in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces} · CPC title

• D21F1/04

  Head boxes of cylinder machines · CPC title

• D21D1/40

  Washing the fibres · CPC title

• D21C9/18 Primary

  De-watering (de-watering in general F26B); {Elimination of cooking or pulp-treating liquors from the pulp}(D21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B) · CPC title