SE8603972D0 - CONTROL SYSTEM FOR THE VENTILATION OF A PAPER MACHINE DRY CAPA - Google Patents

CONTROL SYSTEM FOR THE VENTILATION OF A PAPER MACHINE DRY CAPA

Info

Publication number
SE8603972D0
SE8603972D0 SE8603972A SE8603972A SE8603972D0 SE 8603972 D0 SE8603972 D0 SE 8603972D0 SE 8603972 A SE8603972 A SE 8603972A SE 8603972 A SE8603972 A SE 8603972A SE 8603972 D0 SE8603972 D0 SE 8603972D0
Authority
SE
Sweden
Prior art keywords
hood
control system
exhaust
control loop
level
Prior art date
Application number
SE8603972A
Other languages
Swedish (sv)
Other versions
SE464474B (en
SE8603972L (en
Inventor
R Virta
H Kotajervi
M Karlsson
R Ilmanen
Original Assignee
Valmet 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 Valmet Oy filed Critical Valmet Oy
Publication of SE8603972D0 publication Critical patent/SE8603972D0/en
Publication of SE8603972L publication Critical patent/SE8603972L/en
Publication of SE464474B publication Critical patent/SE464474B/en

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a control system for the ventilation of a paper machine drying hood (10), by which both the exhaust-air stream (m2) diverted from the hood and the replacement air stream (m1) fed to the hood are measured and controlled. In the process, the moisture level and the temperature of the exhaust-air flow are measured. The control system comprises two control loops. With the first control loop (23, 24, 26, 27, 30, 31, 32, 33), the moisture level of the exhaust-air flow is measured and, by influencing the amount of exhaust air (m2), its moisture level is controlled to a predetermined value by a setpoint unit (33). With the second control loop (14, 15, 16, 17, 19, 20, 21, 22) of the control system, the 0 point of the difference between internal pressure and external pressure of the hood (10) to be ventilated, i.e. the so-called 0 level of the hood, is kept at a constant level by measuring the amount of exhaust air (m2), controlled by the first control loop, and setting the setpoint of the amount of replacement air (m1) of the second control loop to a value corresponding to the constant 0 level of the hood (10), determined in advance (Fig. 2) and introduced into the control loop or stored. <IMAGE>
SE8603972A 1985-09-23 1986-09-22 CONTROL SYSTEM FOR VENTILATION OF A PAPER MACHINE DRY CAPE SE464474B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI853654A FI71372B (en) 1985-09-23 1985-09-23 ETT REGLERSYSTEM FOER VENTILATIONEN AV EN PAPPERSMASKINS TORKKAOPA

Publications (3)

Publication Number Publication Date
SE8603972D0 true SE8603972D0 (en) 1986-09-22
SE8603972L SE8603972L (en) 1987-03-24
SE464474B SE464474B (en) 1991-04-29

Family

ID=8521389

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8603972A SE464474B (en) 1985-09-23 1986-09-22 CONTROL SYSTEM FOR VENTILATION OF A PAPER MACHINE DRY CAPE

Country Status (3)

Country Link
DE (1) DE3630561C2 (en)
FI (1) FI71372B (en)
SE (1) SE464474B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE512787C2 (en) * 1997-10-03 2000-05-15 Abb Ab Method, control paradigm and device for controlling and monitoring the process variables for a process gas flowing through a chamber used for drying
DE19911395A1 (en) 1999-03-15 2000-09-21 Voith Sulzer Papiertech Patent Device for determining properties of a running material web and / or a machine for its production and / or refinement
DE19911394A1 (en) 1999-03-15 2000-09-21 Voith Sulzer Papiertech Patent Method for operating a machine for the production and / or finishing of material webs
FI119574B (en) * 2004-11-12 2008-12-31 Metso Paper Inc Method and system in a paper machine and software product
FR2953227B1 (en) * 2009-12-02 2011-12-16 Thermopap METHOD FOR DRYING A PAPER STRIP ON A PAPER MAKING LINE.
EP3736375B1 (en) * 2019-05-06 2023-10-25 Valmet Technologies Oy Method and arrangement for controlling energy consumption in a manufacturing process of a fibrous web
CN111321622B (en) * 2020-03-06 2021-12-24 江苏理文造纸有限公司 Steam heat energy comprehensive utilization system in paper industry

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413427A (en) * 1981-07-29 1983-11-08 Aer Corporation Fuel control system for dryer

Also Published As

Publication number Publication date
DE3630561C2 (en) 1993-12-23
SE464474B (en) 1991-04-29
FI853654A0 (en) 1985-09-23
DE3630561A1 (en) 1987-03-26
SE8603972L (en) 1987-03-24
FI71372B (en) 1986-09-09

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