CA2515981A1 - Method and device for controlling paper machine, and program and storage medium - Google Patents
Method and device for controlling paper machine, and program and storage medium Download PDFInfo
- Publication number
- CA2515981A1 CA2515981A1 CA002515981A CA2515981A CA2515981A1 CA 2515981 A1 CA2515981 A1 CA 2515981A1 CA 002515981 A CA002515981 A CA 002515981A CA 2515981 A CA2515981 A CA 2515981A CA 2515981 A1 CA2515981 A1 CA 2515981A1
- Authority
- CA
- Canada
- Prior art keywords
- control
- paper
- retention
- paper machine
- controlling
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
-
- 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)
- Feedback Control In General (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
A paper machine control device capable of preventing by means of a simple and low-cost configuration problems such as hunting by mutual interference between a retention control and an in-paper ash content control even when the both controls are performed at a short control frequency in a paper machine, and controlling a retention and an ash content with a good accuracy A retention and an in-paper ash content in at least wet part (2a) are controlled by an automatic control system (3) in a papermachine (1). This automatic control system (3) comprises a feedback loop for automatically controlling the retention, a feedback loop for automatically controlling the in-paper ash content, and a non-interference control unit (30) incorporated between the both feedback loops so as to cancel out effects by the mutual interference between the both feedback loops.
Claims (15)
1. A method for controlling a paper machine, the method automatically controlling retention and a ratio of paper ash content at least in a wet part, the method being characterized in that:
a decoupling control mechanism is incorporated between a feedback loop for automatically controlling the retention and a feedback loop for automatically controlling the ratio of paper ash content, to cancel adverse effects of mutual interaction between the loops.
a decoupling control mechanism is incorporated between a feedback loop for automatically controlling the retention and a feedback loop for automatically controlling the ratio of paper ash content, to cancel adverse effects of mutual interaction between the loops.
2. A method for controlling a paper machine according to Claim 1, characterized in that:
the automatic retention control is preformed by measuring the consistency of white water a wire part in the wet part and increasing or reducing the amount of retention aid dosage to a thin stock flow depending on the white water consistency and the automatic control of the ratio of paper ash content is performed by measuring the content of ash in paper after the paper has been dried and increasing or reducing the amount of ash flow added to the thin stock flow depending on the ratio of paper ash content.
the automatic retention control is preformed by measuring the consistency of white water a wire part in the wet part and increasing or reducing the amount of retention aid dosage to a thin stock flow depending on the white water consistency and the automatic control of the ratio of paper ash content is performed by measuring the content of ash in paper after the paper has been dried and increasing or reducing the amount of ash flow added to the thin stock flow depending on the ratio of paper ash content.
3. A method for controlling a paper machine according to Claim 2, characterized in that the consistency of white water in the wire part measured for the automatic retention control is the consistency of white water dehydrated through a wire in the wire part and flowing down into a white water silo below the wire.
4. A method for controlling a paper machine according to Claim 1, characterized in that the decoupling control function uses a static gain of a decoupling control element for steady state characteristic compensation which compensates for the magnitude of mutual interaction between the feedback control loops at the same time.
5. A method for controlling a paper machine according to Claim 3, characterized in that the decoupling control function uses a static gain of a decoupling control element for steady state characteristic compensation which compensates for the magnitude of mutual interaction between the feedback control loops at the same time.
6. A method for controlling a paper machine according to Claim 1, characterized in that the decoupling control function uses a decoupling control element for dynamic state characteristic compensation which compensates for the magnitude of mutual interaction between the feedback control loops taking a time delay into account.
7. A method for controlling a paper machine according to Claim 3, characterized in that the decoupling control function uses a decoupling control element for dynamic state characteristic compensation which compensates for the magnitude of mutual interaction between the feedback control loops taking a time delay into account.
8. A control device for a paper machine which controls retention and a ratio of paper ash content at least in a wet part using an automatic control system, the device being characterized in that:
the automatic retention control system comprises:
a feedback control loop for automatically controlling the retention;
a feedback control loop for automatically controlling the ratio of paper ash content; and a decoupling control section incorporated between the feedback control loops to cancel adverse effects of mutual interaction between the loops.
the automatic retention control system comprises:
a feedback control loop for automatically controlling the retention;
a feedback control loop for automatically controlling the ratio of paper ash content; and a decoupling control section incorporated between the feedback control loops to cancel adverse effects of mutual interaction between the loops.
9. A control device according to Claim 8, characterized in that:
the feedback control loop for automatically controlling the retention comprises a low consistency sensor used to measure the consistency of white water in the wire part in the wet part and a control section that transmits a control signal to a retention operation terminal in a paper machine process so as to increase or reduce the dosage of retention aid added to a thin stock flow on the basis of an actuating error between the white water consistency detected using the low consistency sensor and a predetermined target value, the feedback control loop for automatically controlling the ratio of paper ash content comprising ash flow detecting means for measuring the amount of ash in paper after the paper has been dried and an ash control section that transmits a control signal to a paper ash flow operation terminal in the paper machine process so as to increase or reduce the amount of ash flow added to the thin stock flow on the basis of the actuating error between the amount of the paper ash flow detected using the ash flow detecting means and a predetermined target value, the decoupling control section having a decoupling control element that compensates for the magnitude of mutual interaction.
the feedback control loop for automatically controlling the retention comprises a low consistency sensor used to measure the consistency of white water in the wire part in the wet part and a control section that transmits a control signal to a retention operation terminal in a paper machine process so as to increase or reduce the dosage of retention aid added to a thin stock flow on the basis of an actuating error between the white water consistency detected using the low consistency sensor and a predetermined target value, the feedback control loop for automatically controlling the ratio of paper ash content comprising ash flow detecting means for measuring the amount of ash in paper after the paper has been dried and an ash control section that transmits a control signal to a paper ash flow operation terminal in the paper machine process so as to increase or reduce the amount of ash flow added to the thin stock flow on the basis of the actuating error between the amount of the paper ash flow detected using the ash flow detecting means and a predetermined target value, the decoupling control section having a decoupling control element that compensates for the magnitude of mutual interaction.
10. A control device for a paper machine according to Claim 9, characterized in that the decoupling control element is a feed forward compensating element input to an earlier stage of each operation terminal of each of the feedback control loops in order to compensate for the magnitude of mutual interaction.
11. A control device for a paper machine according to Claim 10, characterized in that the decoupling control element is determined on the basis of a response block for each feedback control loop and an interaction block that causes the feedback control loops to interact with each other.
12. A program for allowing a computer to execute the control method set forth in any of Claims 1 to 5.
13. A program for allowing a computer to execute the control method set forth in Claim 6 or 7.
14. A computer readable storage medium in which the program set forth in claim 12 is stored.
15. A computer readable storage medium in which the program set forth in claim 13 is stored.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-035686 | 2003-02-13 | ||
| JP2003035686A JP4063100B2 (en) | 2003-02-13 | 2003-02-13 | Paper machine control method, control device, program, and storage medium |
| PCT/JP2004/000753 WO2004072367A1 (en) | 2003-02-13 | 2004-01-28 | Paper machine control method, control device, program and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2515981A1 true CA2515981A1 (en) | 2004-08-26 |
| CA2515981C CA2515981C (en) | 2010-06-22 |
Family
ID=32866303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2515981A Expired - Fee Related CA2515981C (en) | 2003-02-13 | 2004-01-28 | Method and device for controlling paper machine, and program and storage medium |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4063100B2 (en) |
| CN (1) | CN100558981C (en) |
| CA (1) | CA2515981C (en) |
| FI (1) | FI20050807A (en) |
| WO (1) | WO2004072367A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10351771A1 (en) | 2003-11-06 | 2005-06-09 | Voith Paper Patent Gmbh | Process for producing a fibrous web |
| DE102005002638A1 (en) * | 2005-01-20 | 2006-07-27 | Voith Paper Patent Gmbh | ash determination |
| US20060162887A1 (en) * | 2005-01-26 | 2006-07-27 | Weinstein David I | System and method to control press section dewatering on paper and pulp drying machines using chemical dewatering agents |
| JP2007011866A (en) * | 2005-07-01 | 2007-01-18 | Yokogawa Electric Corp | Nonintefering control method for process control system and process control system |
| JP4779762B2 (en) * | 2006-03-30 | 2011-09-28 | 栗田工業株式会社 | Effect monitoring method and injection amount control method for papermaking chemicals |
| JP2008025087A (en) * | 2006-06-21 | 2008-02-07 | Nippon Paper Industries Co Ltd | Measuring method and measuring apparatus for sample concentration of papermaking stock |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02160992A (en) * | 1988-12-12 | 1990-06-20 | Toshiba Corp | Control device of weighing of paper making plant |
| JP2754801B2 (en) * | 1989-11-18 | 1998-05-20 | 横河電機株式会社 | Profile non-interference control device |
| FI92729C (en) * | 1993-10-29 | 1994-12-27 | Valmet Paper Machinery Inc | Multilayer headbox pulp feed system and method in multilayer headbox operation |
| JP3728867B2 (en) * | 1997-05-23 | 2005-12-21 | 王子製紙株式会社 | Method and apparatus for automatically controlling the concentration of filtered white water in the wire part of a paper machine and a method for setting a target concentration of filtered white water |
-
2003
- 2003-02-13 JP JP2003035686A patent/JP4063100B2/en not_active Expired - Fee Related
-
2004
- 2004-01-28 CN CNB2004800042827A patent/CN100558981C/en not_active Expired - Fee Related
- 2004-01-28 WO PCT/JP2004/000753 patent/WO2004072367A1/en active Application Filing
- 2004-01-28 CA CA2515981A patent/CA2515981C/en not_active Expired - Fee Related
-
2005
- 2005-08-09 FI FI20050807A patent/FI20050807A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JP4063100B2 (en) | 2008-03-19 |
| FI20050807A (en) | 2005-09-14 |
| CN1751155A (en) | 2006-03-22 |
| WO2004072367A1 (en) | 2004-08-26 |
| JP2004263309A (en) | 2004-09-24 |
| CA2515981C (en) | 2010-06-22 |
| CN100558981C (en) | 2009-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130128 |