EP2085509A3 - Method for measuring and controlling digester or impregnation vessel chip level by means of measuring chip pressure - Google Patents

Method for measuring and controlling digester or impregnation vessel chip level by means of measuring chip pressure Download PDF

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Publication number
EP2085509A3
EP2085509A3 EP08011872A EP08011872A EP2085509A3 EP 2085509 A3 EP2085509 A3 EP 2085509A3 EP 08011872 A EP08011872 A EP 08011872A EP 08011872 A EP08011872 A EP 08011872A EP 2085509 A3 EP2085509 A3 EP 2085509A3
Authority
EP
European Patent Office
Prior art keywords
measuring
chip
pressure
impregnation vessel
digester
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Withdrawn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
EP08011872A
Other languages
German (de)
French (fr)
Other versions
EP2085509A2 (en
Inventor
Sami Tuuri
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.)
Andritz Inc
Original Assignee
Andritz Inc
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
Priority claimed from US12/024,654 external-priority patent/US20080135384A1/en
Priority claimed from US12/107,179 external-priority patent/US20090188641A1/en
Application filed by Andritz Inc filed Critical Andritz Inc
Publication of EP2085509A2 publication Critical patent/EP2085509A2/en
Publication of EP2085509A3 publication Critical patent/EP2085509A3/en
Withdrawn legal-status Critical Current

Links

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
    • D21C7/12—Devices for regulating or controlling
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

A method and system for determining chip pressure in a vessel (10) containing a slurry of lignocellulosic material including: sensing a total static pressure of the slurry in the vessel (10); sensing a hydrostatic pressure of the liquor in the vessel (10), and determining the chip pressure based on a difference of the sensed total static pressure of the slurry and the sensed hydrostatic pressure of the liquor.
EP08011872A 2008-02-01 2008-07-01 Method for measuring and controlling digester or impregnation vessel chip level by means of measuring chip pressure Withdrawn EP2085509A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/024,654 US20080135384A1 (en) 2006-03-20 2008-02-01 Automated Leveling Apparatus
US12/107,179 US20090188641A1 (en) 2008-01-30 2008-04-22 Method and system for measuring and controlling digester or impregnation vessel chip level by measuring chip pressure

Publications (2)

Publication Number Publication Date
EP2085509A2 EP2085509A2 (en) 2009-08-05
EP2085509A3 true EP2085509A3 (en) 2010-12-29

Family

ID=40668419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08011872A Withdrawn EP2085509A3 (en) 2008-02-01 2008-07-01 Method for measuring and controlling digester or impregnation vessel chip level by means of measuring chip pressure

Country Status (1)

Country Link
EP (1) EP2085509A3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016112203A1 (en) * 2015-01-07 2016-07-14 Andritz Inc. System and method for monitoring and control of multiple processing zones within pressurized vessels

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840703A (en) * 1984-11-08 1989-06-20 Rauma-Repola Oy Method for controlling an oxygen bleaching
WO1994020671A1 (en) * 1993-03-02 1994-09-15 Iggesund Tools Ab Method for controlling a process by measurement of wood chips
US5547546A (en) * 1994-10-04 1996-08-20 Ahlstrom Machinery Inc. Chip bin with steaming control and a gas vent containing a vacuum and pressure relief device
US5609729A (en) * 1991-10-21 1997-03-11 Beloit Technologies, Inc. Apparatus for controlling liquid level in a knot drainer
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
US20030089466A1 (en) * 1999-03-18 2003-05-15 Andritz, Inc. Chip feeding to a comminuted cellulosic fibrous material treatment vessel
WO2006072653A1 (en) * 2005-01-05 2006-07-13 Metso Paper, Inc. Method for controlling a pulping process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840703A (en) * 1984-11-08 1989-06-20 Rauma-Repola Oy Method for controlling an oxygen bleaching
US5609729A (en) * 1991-10-21 1997-03-11 Beloit Technologies, Inc. Apparatus for controlling liquid level in a knot drainer
WO1994020671A1 (en) * 1993-03-02 1994-09-15 Iggesund Tools Ab Method for controlling a process by measurement of wood chips
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
US5547546A (en) * 1994-10-04 1996-08-20 Ahlstrom Machinery Inc. Chip bin with steaming control and a gas vent containing a vacuum and pressure relief device
US20030089466A1 (en) * 1999-03-18 2003-05-15 Andritz, Inc. Chip feeding to a comminuted cellulosic fibrous material treatment vessel
WO2006072653A1 (en) * 2005-01-05 2006-07-13 Metso Paper, Inc. Method for controlling a pulping process

Also Published As

Publication number Publication date
EP2085509A2 (en) 2009-08-05

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