EP1056903B1 - Feeding system in connection with the continuous cooking of cellulose containing material - Google Patents

Feeding system in connection with the continuous cooking of cellulose containing material Download PDF

Info

Publication number
EP1056903B1
EP1056903B1 EP99906650A EP99906650A EP1056903B1 EP 1056903 B1 EP1056903 B1 EP 1056903B1 EP 99906650 A EP99906650 A EP 99906650A EP 99906650 A EP99906650 A EP 99906650A EP 1056903 B1 EP1056903 B1 EP 1056903B1
Authority
EP
European Patent Office
Prior art keywords
flow
high pressure
feeding system
liquid
pressure feeder
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.)
Expired - Lifetime
Application number
EP99906650A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1056903A1 (en
Inventor
Vidar Snekkenes
Bo Svanegard
Lennart Gustavsson
Per Nyström
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.)
Metso Fiber Karlstad AB
Original Assignee
Metso Fiber Karlstad AB
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 Fiber Karlstad AB filed Critical Metso Fiber Karlstad AB
Publication of EP1056903A1 publication Critical patent/EP1056903A1/en
Application granted granted Critical
Publication of EP1056903B1 publication Critical patent/EP1056903B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices

Definitions

  • the treatment vessel when a pocket of the high pressure feeder moves towards the low pressure position it is full with liquid from the return liquid flow from the digester or preimpregnation vessel, hereinafter called the treatment vessel.
  • the pocket When the pocket reaches the low-pressure position, the liquid is displaced from above with the mixture of chips and liquid that is present in the chute, whereby the same filling degree as in the chute can be achieved.
  • the filling degree in the chute is normally about 80-85 vol.-% since some excess liquid is demanded for the chip column to be able to move down into the high-pressure feeder.
  • An additional advantage of the system according to the invention is that the pump, hereinafter called the first pump, in the recirculation flow can be coupled in series with a second pump, that pumps liquid from the low pressure recirculation flow to the high pressure return liquid flow from the treatment vessel.
  • the pump head of the first pump can be added to the pump head of the second pump, whereby the second pump may be one standard pump instead of, as in the conventional system, two standard pumps or one high-pressure pump with several impellers.
  • the second pump may be one standard pump instead of, as in the conventional system, two standard pumps or one high-pressure pump with several impellers.
  • said recirculation flow that is the volumetric flow that exits the high-pressure feeder on its low-pressure side is related by a factor 0.8-1.5 to the volumetric chip flow which is handled by the high pressure feeder.
  • the maximum theoretical volumetric flow can be calculated as the volume of the pockets in the high pressure feeder multiplied with the rotary speed of the high pressure feeder and by a factor two (since the pockets are filled twice in each complete rotation).
  • Another way of calculating the volumetric flow is by dividing the incoming chip flow (as measured in a chip meter) by a factor 0.5-0.9.
  • the high pressure feeder comprises rotating pockets, whereby a first pocket, via the first opening 3a, is in open connection with the chute and, via a second opening 3b, which is equipped with a strainer plate, in the housing is connected to a recirculation flow 4 at the same time as a second pocket, via a third opening 3c in the housing, is in open connection with a return liquid flow 5, which comprises liquid that has been separated from the chips in a top separator in the treatment vessel, and, via a fourth opening 3d in the housing is in open connection with a sluicing flow 6 for feeding chips and impregnation liquid to the treatment vessel. Due to the strainer plate in the second opening 3b, chips are to a degree prevented from entering the recirculation flow 4.
  • the pocket which is in open connection with the return liquid flow 5 is filled with liquid at a relatively high pressure at the same time as a mixture of chips and liquid, which was present in the pocket, is displaced into the sluicing flow 6.
  • this pocket moves into the position of the first opening 3a, the liquid in the pocket is again displaced by a mixture of chips and liquid from the chute 2.
  • the filling degree does however not reach optimum since the strainer plate becomes partially plugged by chips.
  • the liquid which has been displaced enters the recirculation flow 4 and is pumped, by a first pump 7, to a sand trap 8, where sand and other particles are removed from the liquid flow. Thereafter, the liquid recirculation flow 4 continues through an in-line drainer 9 and back to the chute 2.
  • the liquid level in the level tank is in its turn controlled by a valve 15 in the conduit 13 between the level tank 11 and the return liquid flow 5.
  • the recirculation flow 4 is in reality controlled by the existence of a screening device in the high pressure feeder 3. When the screening device becomes plugged, the first pump 7 does not get any fluid to pump and thus the flow is interrupted.
  • a tramp material catcher 20 is arranged close to the inlet of the first pump 7.
  • the design of the tramp material catcher 20 is shown in detail in figures 4 and 5 .
  • the pump 7 is capable of maintaining a pumping action even if large amount of chips will enter the recirculation flow 4'.
  • tramp material in form of bolts, nuts, tools and large stones needs to be separated in order not to destroy the pump 7.
  • the tramp material catcher 20 is therefore designed with a pocket 24 in the lower part of the pump inlet.
  • the central part of the pump wheel 22 extended, forming a boss 23 member.
  • the boss member should preferably extend to such an extent that it could create a swirling motion in the flow 4' above the tramp material pocket 24.
  • Figure 3 represents a feeding system according to an alternative embodiment of the invention.
  • the recirculation flow 4" (in this embodiment called a first recirculation flow) is led to the return liquid flow 5 from the treatment vessel and thereby to the high-pressure liquid inlet side of the high pressure feeder 3.
  • a second recirculation flow 19 is led from the return liquid flow 5 to the chute 2 for adjustment of the liquid/wood ratio in the chute, and is controlled by the flow control valve 17" against the flow of chips that is entering the feeding system.
  • the first recirculation flow 4" is regulated, by a chute liquid level control valve 14" or by controlling the rotary speed of the first pump 7", against the liquid level in the chute 2.
  • a similar tramp material catcher 20 is located in the inlet of the pump 7".
  • the safety pressure switches can be set at comfortable levels, e.g. at pressures above 3 bars, preferably above 5 bars, which allows for stable operation minimising costly unwanted interruptions of the production.
  • the relevant opening in the high pressure feeder can be equipped with a screening device with slots narrow enough to make the chips stack up, if the screening device is movable and withdrawn from the opening for a major part of the time. If necessary, that is if the operating conditions otherwise result in an excess of chips entering the recirculation flow, such a screening device could be introduced in the opening just before a pocket is filled up with chips and be withdrawn immediately afterwards, when the pocket proceeds to its high pressure position.

Landscapes

  • Paper (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP99906650A 1998-02-18 1999-02-09 Feeding system in connection with the continuous cooking of cellulose containing material Expired - Lifetime EP1056903B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9800476 1998-02-18
SE9800476A SE9800476D0 (sv) 1998-02-18 1998-02-18 System in connection with the continuous cooking of cellulose containing material
PCT/SE1999/000162 WO1999042653A1 (en) 1998-02-18 1999-02-09 Feeding system in connection with the continuous cooking of cellulose containing material

Publications (2)

Publication Number Publication Date
EP1056903A1 EP1056903A1 (en) 2000-12-06
EP1056903B1 true EP1056903B1 (en) 2009-11-25

Family

ID=20410219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99906650A Expired - Lifetime EP1056903B1 (en) 1998-02-18 1999-02-09 Feeding system in connection with the continuous cooking of cellulose containing material

Country Status (11)

Country Link
EP (1) EP1056903B1 (enExample)
JP (1) JP4739518B2 (enExample)
AT (1) ATE449881T1 (enExample)
AU (1) AU2650599A (enExample)
BR (1) BR9907838B1 (enExample)
CA (1) CA2317750C (enExample)
DE (1) DE69941682D1 (enExample)
ES (1) ES2337532T3 (enExample)
PT (1) PT1056903E (enExample)
SE (1) SE9800476D0 (enExample)
WO (1) WO1999042653A1 (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE519262E (sv) * 2002-03-15 2008-01-08 Kvaerner Pulping Tech Förfarande för matning av cellulosaflis vid kontinuerlig kokning
SE526704C2 (sv) * 2003-12-30 2005-10-25 Kvaerner Pulping Tech Matning av cellulosaflis från en lågtrycksdel till en högtrycksdel med en slussmatare
US8672588B2 (en) 2009-04-15 2014-03-18 Andritz Inc. Unobstructed low pressure outlet and screen grid for a high pressure feeder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE174094C1 (enExample) *
US5443162A (en) * 1993-03-18 1995-08-22 Glentech Inc. High capacity high pressure feeding

Also Published As

Publication number Publication date
CA2317750C (en) 2007-11-27
JP2002504631A (ja) 2002-02-12
DE69941682D1 (de) 2010-01-07
CA2317750A1 (en) 1999-08-26
BR9907838A (pt) 2000-10-24
EP1056903A1 (en) 2000-12-06
BR9907838B1 (pt) 2009-12-01
PT1056903E (pt) 2010-02-11
SE9800476D0 (sv) 1998-02-18
AU2650599A (en) 1999-09-06
ATE449881T1 (de) 2009-12-15
WO1999042653A1 (en) 1999-08-26
JP4739518B2 (ja) 2011-08-03
ES2337532T3 (es) 2010-04-26

Similar Documents

Publication Publication Date Title
FI122896B (fi) Menetelmä ja järjestelmä hienonnetun kuitumateriaalin syöttämiseksi
US6436233B1 (en) Feeding cellulose material to a treatment vessel
CA2174873C (en) Chip pumping to a continuous digester
SE0500751A1 (sv) Matning av finfördelat fibermaterial
US6368453B1 (en) Chip feeding to a comminuted cellulosic fibrous material treatment vessel
EP0330387B1 (en) Improved method and apparatus for processing pulp
EP1056903B1 (en) Feeding system in connection with the continuous cooking of cellulose containing material
US6120646A (en) Feeding system of feeding a cellulose material
US4370172A (en) Controlled vortex pump feed for supplying cellulose-containing material to reaction vessel
CA2508087C (en) Method and system for feeding cellulose chips to a high pressure continuous cooking system
US6451172B1 (en) In-line drainer enhancements
US8974633B2 (en) System and method for the pumped feed of chips to a continuous digester
US20030102093A1 (en) Processes and systems for handling knots in a chemical pulping process
SE530999C2 (sv) Förfarande för behandling av finfördelat fibermaterial vid kokning av pappersmassa
US20030102092A1 (en) Processes and systems for handling knots in a chemical pulping process
US20160215450A1 (en) A method of and an arrangement for introducing process liquid from a treatment step to a washing and/or filtering apparatus
FI129118B (fi) Menetelmä puuhakkeen syöttämiseksi esihydrolyysireaktoriin
FI108652B (fi) Menetelmä ja laitteisto paperi-, kartonki- tai vastaavan tuotantokoneen lyhyen kierron toiminnan ohjaamiseksi
CA2455172C (en) Feeding comminuted fibrous material using high pressure screw and centrifugal pumps
WO2009116942A1 (en) Feeding system comprising parallel pumps and individual flows for a digester

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20000719

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE ES FI FR PT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: METSO FIBER KARLSTAD AB

17Q First examination report despatched

Effective date: 20071011

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES FI FR PT SE

REF Corresponds to:

Ref document number: 69941682

Country of ref document: DE

Date of ref document: 20100107

Kind code of ref document: P

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20100203

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2337532

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20100826

REG Reference to a national code

Ref country code: PT

Ref legal event code: PC4A

Owner name: METSO PAPER SWEDEN AKTIEBOLAG, SE

Effective date: 20110208

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 69941682

Country of ref document: DE

Owner name: METSO PAPER SWEDEN AB, SE

Free format text: FORMER OWNER: METSO FIBER KARLSTAD AB, KARLSTAD, SE

Effective date: 20110420

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

Owner name: METSO PAPER SWEDEN AKTIEBOLAG

Effective date: 20110629

REG Reference to a national code

Ref country code: AT

Ref legal event code: PC

Ref document number: 449881

Country of ref document: AT

Kind code of ref document: T

Owner name: METSO PAPER SWEDEN AKTIEBOLAG, SE

Effective date: 20111223

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20140219

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20140219

Year of fee payment: 16

Ref country code: ES

Payment date: 20140219

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69941682

Country of ref document: DE

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20151030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150302

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20160329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150210

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20180219

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20180227

Year of fee payment: 20

Ref country code: PT

Payment date: 20180206

Year of fee payment: 20

Ref country code: AT

Payment date: 20180219

Year of fee payment: 20

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK07

Ref document number: 449881

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190209

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20190219