NO981650D0 - A method for determining the end point of cellulose boiling and a device for controlling the cellulose boiling time in a reactor - Google Patents

A method for determining the end point of cellulose boiling and a device for controlling the cellulose boiling time in a reactor

Info

Publication number
NO981650D0
NO981650D0 NO981650A NO981650A NO981650D0 NO 981650 D0 NO981650 D0 NO 981650D0 NO 981650 A NO981650 A NO 981650A NO 981650 A NO981650 A NO 981650A NO 981650 D0 NO981650 D0 NO 981650D0
Authority
NO
Norway
Prior art keywords
cooking
values
measurement values
cellulose boiling
cellulose
Prior art date
Application number
NO981650A
Other languages
Norwegian (no)
Other versions
NO981650L (en
Inventor
Dragan Obradovic
Herbert Furumoto
Klaus Fischer
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Publication of NO981650L publication Critical patent/NO981650L/en
Publication of NO981650D0 publication Critical patent/NO981650D0/en

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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/0265—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion
    • G05B13/027—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion using neural networks only

Landscapes

  • Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Software Systems (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Medical Informatics (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Paper (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Electric Ovens (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

The aim of the invention is to determine the point in time during pulp cooking at which the viscosity and/or kappa number of the pulp produced have predetermined values. Since these values can be determined only after the cooking process, appropriate models must be used. To that end, use is made of a neural network whose initial value is the desired viscosity and/or kappa number from which the requisite cooking time can be determined and whose initial values are measurement values of the cooking process. According to the invention, the neural network is adapted during the course of a continuous cooking reaction on the basis of a dynamic model of the changing measurement values. Suitable measurement values during pulp cooking are in particular the SO2 content of the cooking acid and the colour value and electrical conductivity or pH value. In the associated arrangement, the model (10) used is a combination of analytical models (101 to 103, 201 to 204) of the process variables with the neuronal network (100, 200).
NO981650A 1995-10-09 1998-04-08 A method for determining the end point of cellulose boiling and a device for controlling the cellulose boiling time in a reactor NO981650D0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19537539 1995-10-09
PCT/DE1996/001841 WO1997013916A2 (en) 1995-10-09 1996-09-26 Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor

Publications (2)

Publication Number Publication Date
NO981650L NO981650L (en) 1998-04-08
NO981650D0 true NO981650D0 (en) 1998-04-08

Family

ID=7774378

Family Applications (1)

Application Number Title Priority Date Filing Date
NO981650A NO981650D0 (en) 1995-10-09 1998-04-08 A method for determining the end point of cellulose boiling and a device for controlling the cellulose boiling time in a reactor

Country Status (7)

Country Link
EP (1) EP0854953B1 (en)
AT (1) ATE189715T1 (en)
CA (1) CA2234221A1 (en)
DE (1) DE59604434D1 (en)
NO (1) NO981650D0 (en)
WO (1) WO1997013916A2 (en)
ZA (1) ZA968469B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028548A1 (en) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Control device for a continuos digester for the production of cellulose
CA2752471C (en) 2009-02-13 2017-04-25 Abb Research Ltd. A method and a system for optimization of parameters for a recovery boiler

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB747108A (en) * 1953-10-01 1956-03-28 Courtaulds Ltd Improvements in and relating to the production of wood pulp
DE2123497C3 (en) * 1970-05-15 1978-08-03 Mo Och Domsjoe Ab, Oernskoeldsvik (Schweden) Process for the manufacture of sulphate pulps to obtain pulps with a predetermined degree of delignification
US3941649A (en) * 1972-07-14 1976-03-02 Mo Och Domsjo Aktiebolag Process for obtaining a predetermined Kappa number in sulfate pulping
US4086129A (en) * 1975-11-03 1978-04-25 International Telephone And Telegraph Corporation Process for controlling the intrinsic viscosity of sulfite pulp
KR880000744B1 (en) * 1982-11-24 1988-05-04 더 뱁콕 앤드 윌콕스 캄패니 Sulfite digester rate of delignification system
DE3641785A1 (en) * 1986-03-31 1987-10-08 Wolfen Filmfab Veb Process for producing pulp
EP0445321B1 (en) * 1990-03-05 1994-06-01 Siemens Aktiengesellschaft Process for making pulp in a continuous digester
DE9017325U1 (en) * 1990-12-21 1992-01-02 Siemens AG, 8000 München Process control system for controlling pulp production
EP0590433B1 (en) * 1992-10-02 1999-08-25 Siemens Aktiengesellschaft Control process for the production of pulp by control of pressure and temperature

Also Published As

Publication number Publication date
WO1997013916A3 (en) 1997-07-17
DE59604434D1 (en) 2000-03-16
CA2234221A1 (en) 1997-04-17
ATE189715T1 (en) 2000-02-15
EP0854953B1 (en) 2000-02-09
NO981650L (en) 1998-04-08
ZA968469B (en) 1997-04-09
WO1997013916A2 (en) 1997-04-17
EP0854953A2 (en) 1998-07-29

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Legal Events

Date Code Title Description
FC2A Withdrawal, rejection or dismissal of laid open patent application