Method of and an arrangement for introducing process liquid from a treatment step to a washing and/or filtering apparatus

Patent metadata

Field	Value
Publication number	US-9663897-B2
Application number	US-201514899961-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Jul 1, 2014
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A method of and an arrangement for introducing fiber suspension or pulp from a pulp vessel to a washing and/or filtering apparatus is based on simultaneous division and degassing of pulp at immediately upstream of the washing and/or filtering apparatus.

First claim

The invention claimed is:

1. A method of introducing pulp or fiber suspension of pulp and paper industry from a treatment step to a washing or filtering apparatus having at least one inlet for receiving the pulp or fiber suspension of pulp and paper industry, the method comprising:
discharging pulp or fiber suspension of pulp and paper industry from the treatment step to a gas separator;
separating gas from the pulp or fiber suspension of pulp and paper industry;
introducing the pulp or fiber suspension of pulp and paper industry to the washing or filtering apparatus,
performing the separation of gas from the pulp or fiber suspension of pulp and paper industry at a level of the at least one inlet; and
controlling the feed pressure of the washing or filtering apparatus by a valve arranged in connection with the gas separator.

2. The method as recited in claim 1 , wherein the separation of gas from the pulp or fiber suspension of pulp and paper industry includes dividing the pulp or fiber suspension of pulp and paper industry to a number of partial flows simultaneously with the separation of gas from the pulp or fiber suspension of pulp and paper industry, and the introduction of the pulp or fiber suspension of pulp and paper industry includes introducing each partial flow to a corresponding inlet of the at least one inlet of the washing and/or filtering apparatus.

3. The method as recited in claim 2 , wherein the separation of gas from the pulp or fiber suspension of pulp and paper industry includes performing the gas separation and the division of the pulp or fiber suspension of pulp and paper industry flow by a gas separator.

4. The method as recited in claim 1 , wherein the treatment step is practiced in one of an upflow vessel, a downflow vessel, a washer, screening and a screw feeder.

5. The method as recited in claim 1 , wherein, the discharge of the pulp or fiber suspension of pulp and paper industry includes discharging pulp or fiber suspension from an upflow vessel to a downflow vessel, and providing the gas separator at a lower end of the downflow vessel or in flow communication therewith.

6. The method as recited in claim 1 , wherein the valve is one of an adjustable valve and a fixed throttling arranged in communication with the gas separator.

7. The method as recited in claim 1 , wherein the pulp or fiber suspension has a consistency, the method further comprising performing the method at a consistency above 5%.

8. The method as recited in claim 1 , wherein the pulp or fiber suspension has a consistency, the method further comprising performing the method at a consistency between 7 and 12%.

9. An arrangement for introducing a pulp or fiber suspension of pulp and paper industry from a treatment step to a washing or filtering apparatus, the arrangement including a treatment in which pulp or fiber suspension of pulp and paper industry is discharged to a gas separation and taken therefrom to a washing or filtering apparatus having at least one inlet, the arrangement comprising:
a gas separator configured to perform gas separation, the gas separator being arranged at a level of the at least one inlet and including a valve configured to control a feed pressure of the washing or filtering apparatus.

10. The arrangement as recited in claim 9 , wherein the filtering apparatus has a plurality of inlets and the gas separator is configured to divide the pulp to the inlets of the washing or filtering apparatus.

11. The arrangement as recited in claim 9 , wherein the arrangement is configured to perform the treatment step in at least one of an upflow vessel and a downflow vessel, the downflow vessel including, at a lower end or in flow communication therewith, the gas separator.

12. The arrangement as recited in claim 11 , wherein the gas separator and washing or filter apparatus are arranged below the downflow vessel.

13. The arrangement as recited in claim 9 , wherein the treatment step is practiced in one of a washer, screening and a screw feeder arranged in flow communication with the gas separator.

14. The arrangement as recited in claim 9 , wherein the gas separator is supported on the washing or filtering apparatus.

15. The arrangement as recited in claim 9 , wherein the gas separator is supported at a side of the washing or filtering apparatus on the same support structure with the washing or filtering apparatus.

16. The arrangement as recited in claim 9 , wherein the gas separator includes a housing with an inlet, a plurality of outlets for the pulp or fiber suspension of pulp and paper industry, an outlet for gas, a shaft and at least one vane arranged on the shaft.

Assignees

• Sulzer Management Ag

Inventors

• Vesala Reijo
• Vikman Vesa

Classifications

• D21C9/02 Primary

  Washing {; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents} · CPC title

• D21C9/18

  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

• D21C7/08 Primary

  Discharge devices · CPC title

• D21C9/06

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