EP2188443A1 - A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly - Google Patents

A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly

Info

Publication number
EP2188443A1
EP2188443A1 EP08794130A EP08794130A EP2188443A1 EP 2188443 A1 EP2188443 A1 EP 2188443A1 EP 08794130 A EP08794130 A EP 08794130A EP 08794130 A EP08794130 A EP 08794130A EP 2188443 A1 EP2188443 A1 EP 2188443A1
Authority
EP
European Patent Office
Prior art keywords
container
nozzle assembly
suspension
fibre
nozzles
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.)
Withdrawn
Application number
EP08794130A
Other languages
German (de)
French (fr)
Other versions
EP2188443A4 (en
Inventor
Ebbe Hoden
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2188443A1 publication Critical patent/EP2188443A1/en
Publication of EP2188443A4 publication Critical patent/EP2188443A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6446—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6453—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a translational movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/22—Directing the mixture to be filtered on to the filters in a manner to clean the filters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • 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

Definitions

  • a method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly.
  • the invention relates to a method and a device for the dewa- tering of a fibre suspension, of the kind that is seen in the preamble of the appended independent method claim and the device claim, respectively.
  • Fibre suspension may, for instance, be the liquid suspension removed from a stock, which contains a residual amount of fibres. It may be desirable to, from the suspension, separate at least a part of the particles/fibres, in order to be able to use the same in a useful way. Furthermore, it is necessary or favourable to, from the suspension, remove as great part of the particles/fibres as possible before the liquid part thereof (water) is brought back to the environment.
  • an object of the invention is to provide a technique by which separation of fibres from a fibre suspension can be carried out in a simple and efficient manner.
  • the invention comprises essentially that the screening material is formed to a vertically orientated elongate container, that the suspension is introduced into the container via a vertical elongate nozzle assembly, which in all essentials is concentrically arranged in the container, and that the nozzle assembly is arranged to spray the suspension via a plurality of nozzles spaced-apart around the assembly against the inside of the shell wall of the container.
  • the nozzle assembly is displaced in relation to the container in the axial direction thereof.
  • the nozzle assembly which preferably carries two or more groups of nozzles spaced-apart along the assembly, which are distributed around the circumference of the assembly, can furthermore be rotated in rela- tion to the substantially vertical axis of the container.
  • the bottom part of the container may be provided with a valve device or lock device, through which fibre fraction accumulated in the bottom part of the container can be withdrawn.
  • a liquid level sensor is arranged to detect the liquid level in the container and is arranged to control the flow of suspension supplied to the container in such a manner that the liquid level of the container lies under the nozzle assembly.
  • the container may be received in a surrounding housing, which catches liquid separated from the suspension and leads the same away.
  • Figure 1 schematically shows an axially sectioned device according to the invention.
  • Figure 2 schematically shows a section taken along line II-II in figure 1.
  • an elongate vertically orientated tubular container 1 of wire cloth material is schematically shown, which in the upper end thereof is carried by a structure not closer shown.
  • a nozzle assembly 2 is shown comprising a generally vertically directed pipe 3, which connects to a plurality of groups 4 of nozzles 5, the nozzles 5 being arranged to spray suspension introduced via the pipe 3 radially outward toward the inside of the container 1. From figure 2 it can be seen that the nozzles of the respective group 4 are distributed around the circumference of the assembly 2.
  • the assembly 2 is in all essentials concentric with the container 1 and is arranged manageable around the axis thereof and of the container 1 by means of a schematically shown driving engine 7. Suspension is supplied to the pipe 3 by elevated pressure, for instance via a swivel connection 8. At the lower end part of the container 1, at a distance under the nozzle assembly 2, there is a valve device 10. The lower end of the container connects to a pipe 11 having a valve device 10.
  • the valve device 10 may, for instance, con- sist of two slide valves 15 spaced-apart along the pipe 11, which can be arranged to form a lock in the pipe 11 leaning downward from the container.
  • the valve device 10 is driven in order to enable feeding out of a fibre suspension of elevated fibre content, from the lower part of the container 1 or the upper part of the pipe 11.
  • This fraction may, for instance, under the impact of the gravity be fed out via the valve device of the pipe 11 to a collecting container 14 and may from there be fed out onto a conveyor belt 12, which, for instance, may consist of wire cloth or the like in order to mechanically be dewatered in contact with a clamping device 13 lying above, for instance, in the form of an endless press band of screen cloth, which via, for instance, squeezing rollers is pressed against the fibre material on the conveyor belt 12.
  • the container 1 is surrounded by a housing 9, the walls of which are lying at a radial distance outside the container 1 and has a bottom outlet 91. Suspension liquid leaving through the wall of the container 1 is collected in the housing 9 and is led away via the drainage 91 thereof.
  • the engine 7 is advantageously arranged to impart the nozzle assembly 2, in addition to a rotary motion, an axial reciprocating motion, so that the suspension spray which is leaving the respective nozzle 5 also can carry out a scraping function in respect of fibres tending to deposit on the inside of the container 1, so that deposited fibres move downward toward the bottom of the container.
  • the suspension flow to the container is adapted so that the container in all essentials is not flowed by the suspension, i.e., so that the suspension jets freely pass between nozzle and container wall.
  • the jets are given such high speed that a substantial share of the liquid of the suspension leaves through the wire cloth, while the fibres to a substantial share are retained in the container.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)

Abstract

A vertically elongate and orientated container (1) of wire cloth material contains a vertically orientated nozzle assembly (2), which against the inner wall of the container sprays a fibre suspension. The nozzle assembly is revolved around the axis of the container and is displaced backwards and forwards vertically so that the suspension sprays, which in the direction radially outward widen against the shell wall of the container (1) afford a cleaning effect in respect of deposited fibres on the inner wall of the container (1) at the same time as the liquid of the suspension efficiently is separated through the container wall in order to then be collected in a housing (9) surrounding the container (1). The device as well as the method are claimed (Fig. 1).

Description

A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly.
The invention relates to a method and a device for the dewa- tering of a fibre suspension, of the kind that is seen in the preamble of the appended independent method claim and the device claim, respectively.
Fibre suspension may, for instance, be the liquid suspension removed from a stock, which contains a residual amount of fibres. It may be desirable to, from the suspension, separate at least a part of the particles/fibres, in order to be able to use the same in a useful way. Furthermore, it is necessary or favourable to, from the suspension, remove as great part of the particles/fibres as possible before the liquid part thereof (water) is brought back to the environment.
It is in that connection previously well known that it is possible to lead the suspension through a screening material through which the liquid share of the suspension passes, the fibre fraction largely being collected on the screening material and then being collected for further handling.
A problem is to carry out such a separation in an efficient way. Therefore, an object of the invention is to provide a technique by which separation of fibres from a fibre suspension can be carried out in a simple and efficient manner.
The object is attained by the invention. The invention is defined in the appended independent claims.
Embodiments of the invention are defined in the appended dependent claims. The invention comprises essentially that the screening material is formed to a vertically orientated elongate container, that the suspension is introduced into the container via a vertical elongate nozzle assembly, which in all essentials is concentrically arranged in the container, and that the nozzle assembly is arranged to spray the suspension via a plurality of nozzles spaced-apart around the assembly against the inside of the shell wall of the container.
The nozzle assembly is displaced in relation to the container in the axial direction thereof. The nozzle assembly, which preferably carries two or more groups of nozzles spaced-apart along the assembly, which are distributed around the circumference of the assembly, can furthermore be rotated in rela- tion to the substantially vertical axis of the container.
Since the container is stationary, the bottom part of the container may be provided with a valve device or lock device, through which fibre fraction accumulated in the bottom part of the container can be withdrawn. A liquid level sensor is arranged to detect the liquid level in the container and is arranged to control the flow of suspension supplied to the container in such a manner that the liquid level of the container lies under the nozzle assembly. The container may be received in a surrounding housing, which catches liquid separated from the suspension and leads the same away.
The invention will in the following be described in the form of example, reference being made to the appended drawing.
Figure 1 schematically shows an axially sectioned device according to the invention. Figure 2 schematically shows a section taken along line II-II in figure 1. In figure 1, an elongate vertically orientated tubular container 1 of wire cloth material is schematically shown, which in the upper end thereof is carried by a structure not closer shown. In the upper part of the container 1, a nozzle assembly 2 is shown comprising a generally vertically directed pipe 3, which connects to a plurality of groups 4 of nozzles 5, the nozzles 5 being arranged to spray suspension introduced via the pipe 3 radially outward toward the inside of the container 1. From figure 2 it can be seen that the nozzles of the respective group 4 are distributed around the circumference of the assembly 2. The assembly 2 is in all essentials concentric with the container 1 and is arranged manageable around the axis thereof and of the container 1 by means of a schematically shown driving engine 7. Suspension is supplied to the pipe 3 by elevated pressure, for instance via a swivel connection 8. At the lower end part of the container 1, at a distance under the nozzle assembly 2, there is a valve device 10. The lower end of the container connects to a pipe 11 having a valve device 10. The valve device 10 may, for instance, con- sist of two slide valves 15 spaced-apart along the pipe 11, which can be arranged to form a lock in the pipe 11 leaning downward from the container. The valve device 10 is driven in order to enable feeding out of a fibre suspension of elevated fibre content, from the lower part of the container 1 or the upper part of the pipe 11. This fraction may, for instance, under the impact of the gravity be fed out via the valve device of the pipe 11 to a collecting container 14 and may from there be fed out onto a conveyor belt 12, which, for instance, may consist of wire cloth or the like in order to mechanically be dewatered in contact with a clamping device 13 lying above, for instance, in the form of an endless press band of screen cloth, which via, for instance, squeezing rollers is pressed against the fibre material on the conveyor belt 12.
The container 1 is surrounded by a housing 9, the walls of which are lying at a radial distance outside the container 1 and has a bottom outlet 91. Suspension liquid leaving through the wall of the container 1 is collected in the housing 9 and is led away via the drainage 91 thereof.
The engine 7 is advantageously arranged to impart the nozzle assembly 2, in addition to a rotary motion, an axial reciprocating motion, so that the suspension spray which is leaving the respective nozzle 5 also can carry out a scraping function in respect of fibres tending to deposit on the inside of the container 1, so that deposited fibres move downward toward the bottom of the container. The suspension flow to the container is adapted so that the container in all essentials is not flowed by the suspension, i.e., so that the suspension jets freely pass between nozzle and container wall. The jets are given such high speed that a substantial share of the liquid of the suspension leaves through the wire cloth, while the fibres to a substantial share are retained in the container.

Claims

Claims
1. A method for the dewateriπg of a fibre suspension, the suspension from above being introduced into an elongate tubular vertically orientated container of a fibre separation material such as wire cloth, characterized in that the liquid suspension is introduced into the container via a nozzle assembly (2) , which is placed centrally in the container and which has a plurality of nozzles spaced-apart around the axis of the container, the fibre suspension being supplied to the nozzle assembly by an elevated pressure, and that the nozzle assembly is displaced axially in relation to the container.
2. Method according to claim 1, characterized in that the nozzle assembly is displaced backwards and forwards along the axial direction of the container.
3. Method according to claim 1, characterized in that the container is kept stationary.
4. Method according to any one of claims 1 to 3, characterized in that the nozzle assembly is imparted a rotary motion in relation to the container around the axis of the container.
5. Method according to any one of the preceding claims, characterized in that the fibre suspension is sprayed through a plurality of groups of nozzles, which are spaced-apart along the nozzle assembly, and that the nozzles of the respective group are spaced-apart around the longitudinal direction of the nozzle assembly, which is parallel to the longitudinal direction of the container.
6. A device for the dewatering of a fibre suspension, comprising an elongate and vertically orientated tubular con- tainer of a liquid-permeable fibre-separating material such as wire cloth, and a means for introducing the fibre suspension into the container, characterized by a nozzle assembly (2) centrally placed in the container, which has a plurality of nozzles, which are arranged to direct sprays of the fibre suspension against the inside of the circumference wall of the container, and means for, by elevated pressure, supply the fibre suspension to the nozzle assembly.
7. Device according to claim 6, characterized in that the nozzle assembly has a plurality of groups of nozzles spaced-apart along the nozzle assembly, the nozzles of the groups being spaced-apart around the circumference of the assembly.
8. Device according to claim 6 or 7 , characterized by a driving assembly for the rotation of the nozzle assembly around the axis of the container.
9. Device according to claim 8, characterized in that the driving assembly is arranged to impart the nozzle assembly a reciprocating motion along the axis of the container, that the container is stationary, and that the container is at a distance enclosed by a housing (9) for collection of suspen- sion liquid and that the housing has a bottom drainage (91) for leading away collected suspension liquid.
10. Device according to any one of claims 6-9, characterized in that a valve device (10) is arranged to enable select- able leading out of a suspension fraction having elevated fibre content from the lower end part of the container.
EP08794130.8A 2007-09-17 2008-09-12 A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly Withdrawn EP2188443A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0702091A SE531514C2 (en) 2007-09-17 2007-09-17 Method and apparatus for dewatering a fiber suspension supplied by a nozzle assembly
PCT/SE2008/000510 WO2009038516A1 (en) 2007-09-17 2008-09-12 A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly.

Publications (2)

Publication Number Publication Date
EP2188443A1 true EP2188443A1 (en) 2010-05-26
EP2188443A4 EP2188443A4 (en) 2013-09-25

Family

ID=40468145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08794130.8A Withdrawn EP2188443A4 (en) 2007-09-17 2008-09-12 A method and a device for the dewatering of a fibre suspension supplied by a nozzle assembly

Country Status (6)

Country Link
US (1) US20100252214A1 (en)
EP (1) EP2188443A4 (en)
CN (1) CN101542041B (en)
CA (1) CA2699757A1 (en)
SE (1) SE531514C2 (en)
WO (1) WO2009038516A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102091470B (en) * 2010-11-30 2013-08-28 赵善彬 White water filtering machine
CN102166451A (en) * 2011-02-21 2011-08-31 安徽省华银茶油有限公司 Drum-type raw oil filter
JP6019722B2 (en) * 2012-05-08 2016-11-02 住友電気工業株式会社 Liquid filtration device and ballast water treatment device
SE537357C2 (en) * 2013-01-11 2015-04-14 Valmet Oy Apparatus for washing and / or dewatering cellulose pulp
CN106731117A (en) * 2017-01-23 2017-05-31 浙江腾荣环保科技有限公司 One kind scrapes slag formula filter
CN115501685B (en) * 2022-10-17 2024-04-26 信和（天津）环保科技发展有限公司 Multiple sewage filters filter core assembly

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB843166A (en) * 1958-02-15 1960-08-04 Celleco Ab Arrangement for removal of resin and/or dewatering of pulp
GB1201635A (en) * 1966-10-20 1970-08-12 Defibrator Ab Improvements in or relating to dewaterers for a fibre pulp suspension
FI68686C (en) * 1980-01-10 1985-10-10 Kamyr Ab ANORDNING FOER BEHANDLING AV STROEMMANDE SUSPENSIONER
AU2669192A (en) * 1991-09-26 1993-04-27 Sunds Defibrator Industries Ab An arrangement and a method for concentrating a suspension
SE470533B (en) * 1992-11-25 1994-07-25 Sunds Defibrator Ind Ab Concentration method and apparatus
FI112385B (en) * 1998-09-23 2003-11-28 Andritz Oy Method and apparatus for treating pulp
US6622868B1 (en) * 2002-07-12 2003-09-23 Whitewater Solutions Corp. System for recovering and recycling usable fibers from white water in a papermaking process
CN1204315C (en) * 2002-09-24 2005-06-01 中国科学院广州化学研究所 Auxiliary dehydrating plant for vacuum wash hollander
SE531513C2 (en) * 2007-09-17 2009-05-05 Ebbe Hoden Method and apparatus for dewatering a fiber suspension in a vertical elongated container formed by two endless wire ribbons

Also Published As

Publication number Publication date
CN101542041B (en) 2012-01-25
WO2009038516A1 (en) 2009-03-26
EP2188443A4 (en) 2013-09-25
SE0702091L (en) 2009-03-18
US20100252214A1 (en) 2010-10-07
SE531514C2 (en) 2009-05-05
CN101542041A (en) 2009-09-23
CA2699757A1 (en) 2009-03-26

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