EP0971069A3 - Mixing and recirculation circuit - Google Patents

Mixing and recirculation circuit Download PDF

Info

Publication number
EP0971069A3
EP0971069A3 EP99106910A EP99106910A EP0971069A3 EP 0971069 A3 EP0971069 A3 EP 0971069A3 EP 99106910 A EP99106910 A EP 99106910A EP 99106910 A EP99106910 A EP 99106910A EP 0971069 A3 EP0971069 A3 EP 0971069A3
Authority
EP
European Patent Office
Prior art keywords
vessel
extracted water
backflow
mixing
pipes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99106910A
Other languages
German (de)
French (fr)
Other versions
EP0971069A2 (en
EP0971069B1 (en
Inventor
Erwin Binder
Karl-Heinz Beuermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiertechnik Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiertechnik Patent GmbH
Publication of EP0971069A2 publication Critical patent/EP0971069A2/en
Publication of EP0971069A3 publication Critical patent/EP0971069A3/en
Application granted granted Critical
Publication of EP0971069B1 publication Critical patent/EP0971069B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Landscapes

  • Paper (AREA)
  • Cartons (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

The system for the mixing and recirculation of fiber pulp with returned extracted water from the fourdrinier section, at a machine for the production of paper or cardboard with a stock inlet using controlled dilution water, has a unit (17) to increase the pressure in the path between the mixing vessel (7) and the vessel (1) to hold extracted water from the fourdriniers. The mixing vessel (7) has one chamber (7.1) with a number of feeds (4-6), and a second chamber (7.2) with at least one take-off (15) to the extracted water vessel (1). An overflow (19) gives a flow connection between the two mixing vessel chambers (7.1,7.2). An impeller pump (17), between the mixing (7) and extracted water (1) vessels gives the increased pressure. A control valve (18) is in the connection between the two vessels (7,1). A control circuit (16.1,16.2) determines the fluid level in the mixing vessel (7). Two concentric feed pipes (19,20) give a feed of fresh matter and the return flow at the extracted water vessel (1). An additional concentric pipe (21) at the feed and backflow pipes (19,20) takes the inflow into the extracted water vessel (1) from the cleaning station overflow. A gap is between the pipes (19-21) in the flow direction, and their ends are positioned from the outwards towards the inwards, in sequence. The feed tube (21) for the backflow ends before the end of the feed pipe (19), A mixer, such as a propeller, is in the mixing vessel (7). An Independent claim is included for the operation of the system, where the extracted water is taken from the wet section of the machine to be passed to a container (1). The mixing vessel (7) takes the backflow from the recirculating pulp at the stock inlet, the usable suspension from at least one vertical sorting stage and the backflow from a pulp cleaning stage, to be mixed together. The backflow (4-6) is injected into the lower section of the extracted water vessel (1) through a pressure increase unit (17) such as a pump, to be mixed with the extracted water and fresh material (8). The mixture is delivered to the stock inlet through a cleaning stage and/or a vertical sorter. Preferred Features: The backflow (4-6) is fed into the first mixing chamber (7.1), to pass to the second chamber (7.2) through an overflow, and is passed to the extracted water vessel (1) by a pump (17). The backflow (4-6) is controlled by a level monitor at the mixing vessel (7). The backflow (4-6) and the fresh material (8) pass into the extracted water vessel (1) through two concentric pipes (19,20), and the overflow (22) from the cleaning stage is passed into the lower section of the extracted water vessel (1), using an assembly of three concentric pipes (19-21).
EP99106910A 1998-07-09 1999-04-08 Mixing and recirculation circuit Expired - Lifetime EP0971069B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19830600A DE19830600A1 (en) 1998-07-09 1998-07-09 Mixing and recirculation cycle
DE19830600 1998-07-09

Publications (3)

Publication Number Publication Date
EP0971069A2 EP0971069A2 (en) 2000-01-12
EP0971069A3 true EP0971069A3 (en) 2000-06-28
EP0971069B1 EP0971069B1 (en) 2003-03-26

Family

ID=7873397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106910A Expired - Lifetime EP0971069B1 (en) 1998-07-09 1999-04-08 Mixing and recirculation circuit

Country Status (4)

Country Link
US (1) US6277243B1 (en)
EP (1) EP0971069B1 (en)
AT (1) ATE235597T1 (en)
DE (2) DE19830600A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI104384B (en) * 1998-06-05 2000-01-14 Valmet Corp Apparatus and Method for Mixing Freshwater and Fresh Mass in a Post-Wastewater Canal
SE534313C2 (en) 2009-11-06 2011-07-05 Metso Paper Sweden Ab System and method for pumping chips into a continuous boiler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477313A (en) * 1981-12-03 1984-10-16 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for producing a multilayer paper web
DE4000558A1 (en) * 1989-01-16 1990-07-19 Enso Gutzeit Oy Paper-making with application of pulp suspension to a sieve wire - with addn. of enzyme to recirculation water passing through wire to cleave deleterious dissolved substances such as hemicellulose
DE19509522A1 (en) * 1995-03-20 1996-09-26 Voith Sulzer Papiermasch Gmbh Wet section of a paper machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE383906B (en) * 1973-09-14 1976-04-05 Isorel Sa PROCEDURE IN THE MANUFACTURE OF TREFIBER PLATES ACCORDING TO THE WATER METHOD AND WITH THE ENDED WATER SYSTEM
CH560651A5 (en) * 1973-10-04 1975-04-15 Stoecklin & Cie
CH653395A5 (en) * 1981-09-25 1985-12-31 Escher Wyss Gmbh METHOD FOR OPERATING A TOTAL PLANT FOR PRODUCING PAPER AND TOTAL PLANT FOR IMPLEMENTING THE METHOD.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477313A (en) * 1981-12-03 1984-10-16 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for producing a multilayer paper web
DE4000558A1 (en) * 1989-01-16 1990-07-19 Enso Gutzeit Oy Paper-making with application of pulp suspension to a sieve wire - with addn. of enzyme to recirculation water passing through wire to cleave deleterious dissolved substances such as hemicellulose
DE19509522A1 (en) * 1995-03-20 1996-09-26 Voith Sulzer Papiermasch Gmbh Wet section of a paper machine

Also Published As

Publication number Publication date
EP0971069A2 (en) 2000-01-12
EP0971069B1 (en) 2003-03-26
DE19830600A1 (en) 2000-01-13
ATE235597T1 (en) 2003-04-15
US6277243B1 (en) 2001-08-21
DE59904692D1 (en) 2003-04-30

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