EP0105975A1 - Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier - Google Patents

Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier Download PDF

Info

Publication number
EP0105975A1
EP0105975A1 EP82201286A EP82201286A EP0105975A1 EP 0105975 A1 EP0105975 A1 EP 0105975A1 EP 82201286 A EP82201286 A EP 82201286A EP 82201286 A EP82201286 A EP 82201286A EP 0105975 A1 EP0105975 A1 EP 0105975A1
Authority
EP
European Patent Office
Prior art keywords
valve
cylinder
conduit
steam
fluid
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
Application number
EP82201286A
Other languages
English (en)
French (fr)
Other versions
EP0105975B1 (de
Inventor
Rudi Van Os
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.)
KNP LEYKAM SERVICES BV
Nv Koninklijke Knp Bt nv Koninklijke Knp
Original Assignee
Koninklijke Nederlandsche Papierfabriek NV
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 Koninklijke Nederlandsche Papierfabriek NV filed Critical Koninklijke Nederlandsche Papierfabriek NV
Priority to AT82201286T priority Critical patent/ATE17879T1/de
Priority to DE8282201286T priority patent/DE3268994D1/de
Priority to EP82201286A priority patent/EP0105975B1/de
Publication of EP0105975A1 publication Critical patent/EP0105975A1/de
Application granted granted Critical
Publication of EP0105975B1 publication Critical patent/EP0105975B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21F5/022—Heating the cylinders
    • D21F5/028—Heating the cylinders using steam
    • 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
    • D21F5/10—Removing condensate from the interior of the cylinders

Definitions

  • This invention relates to a method and apparatus for the removal of condensate from a cylinder, in particular a cylinder for drying paper, to which cylinder a fluid under pressure is supplied via a first conduit, and with which cylinder means are coupled for the removal of this fluid via a second conduit.
  • a water/paper mixture for example having a water-to-paper ratio of 200:1 is processed in successive stages to withdraw an ever larger quantity of water.
  • the semi-dry mixture is subsequently passed in a broad ribbon over a plurality of rotating drying cylinders. These cylinders are hollow and closed at the sides.
  • steam is supplied to the interior of each cylinder as a drying fluid, which steam gives up heat to the paper web via the cylinder wall.
  • the condensate must be removed from the cylinder, because a layer of condensate within the cylinder adversely affects the transfer of heat from the steam to the cylinder wall, and when not removed, the cylinder ultimately becomes full of water.
  • the condensate is not only present on the bottom of the cylinder, but a layer of condensate is formed throughout the entire inner circumference of the cylinder.
  • a syphon in the cylinder which may be stationary, or adapted to rotate.
  • the syphon inlet is positioned within the cylinder spaced a small distance from the cylinder wall, and the syphon outlet is disposed adjacent to the longitudinal axis of the cylinder.
  • the pressure in the cylinders and the pressure differential across the syphons is kept constant by control apparatus.
  • the pressure differential In order to ensure that no cylinder is flooded with condensed water and a cylinder, once flooded, is automatically de-watered, the pressure differential must be adapted to the centrifugal force that has to be overcome when condensate only is discharged.
  • the reaction force is determined by the centrifugal force on the gas/conden- sate mixture and the resistance which this mixture experiences as a result of the current towards and through the syphon.
  • the aim is for an increase in rotary speed of the cylinders, which increase in velocity results in an increase in centrifugal force, and hence in rendering the required steam pressure for the removal of the condensate still higher.
  • the required minimum pressure and the associated temperature in the cylinder are increased to such an extent as to render impossible a proper control of the moisture evaporation process, which is necessary for making high-quality paper. If, in the prior system, it is desired for the rate of evaporation to be decreased, it is inevitable to tolerate a certain quantity of condensate in the cylinders.
  • the pressure differential across the syphon adapts itself to the quantity of condensate to be transported.
  • the maximum pressure differential, which in the prior method is continuously maintained, is virtually never reached in the method according to the invention, which is favourable for the energetic efficiency of the drying cylinder.
  • Still another advantage is that the drive for rotating the cylinders needs to be of less heavy construction than with the prior method.
  • the drive in the prior method, the drive must be designed for rotating a cylinder entirely flooded with condensate; such a flooded cylinder cannot occur in the method according to the present invention.
  • a source of steam is coupled via a first controllable valve with the fluid supply conduit
  • a source of compressed air is coupled via a second controllable valve also to said fluid supply conduit
  • the arrangement being such that when the measured quantity of gaseous component is too low, this is controlled in the first instance by controlling the degree of opening of said first valve and in the second instance, when said first valve has been opened to a pre-determined position, by controlling the degree of opening of said second valve, and when the measured quantity of gaseous component is too large, in the first instance the degree of opening of the second valve is controlled and in the second instance, when said second valve is fully closed, the degree of_ opening of said first valve is controlled.
  • the invention also provides an apparatus for the removal of condensate from a cylinder, in particular a cylinder for drying paper, comprising a first conduit for the supply of a fluid under pressure to said cylinder and a second conduit for the removal of said fluid, there being provided means for separating the fluid in the discharge conduit into a gaseous component and a liquid component, a measuring means for determining the quantity of gaseous component, and control means for keeping the quantity of gaseous component at a constant value.
  • the apparatus comprises a source of steam which via a first controllable valve is coupled with the fluid supply conduit, and with a source of compressed air which via a second controllable valve is also coupled to said fluid supply conduit, said first and said second valve being coupled with said control means.
  • steam is supplied via a conduit 2 from a source of steam 3.
  • the quantity of steam can be adjusted by means of a controllable valve 4.
  • the gas is supplied via a conduit 11 to an orifice plate 12, by means of which the quantity of gas flowing through it can be determined by means of the pressure difference measured.
  • the gas is subsequently also supplied to receptacle 10 via conduit 13. Further connected to this receptacle are a further conduit 14 for the removal of gas under low pressure, and a conduit 15 for the discharge of condensate.
  • the pressure in receptacle 10 must be selected at least so much lower than the pressure in steam supply conduit 2 that the velocity of the steam in the valve is critical. At a critical steam velocity through valve 4, there is a unique relationship between the adjusted position of the valve and the amount of steam passed.
  • the pressure difference of the gas flowing through orifice plate 12 is converted in measuring device 16 into a certain air pressure.
  • This air pressure is passed via conduit 17 to a control device 18.
  • Control device 18 can ensure that the pressure difference across orifice plate 12 is maintained at a pre-determined, constant value by controlling the supply of gas to the drying cylinder. In this way it is possible to keep the gas flow velocity in syphon 5 constant at a pre-determined value independent of the amount of condensate.
  • Control device 18 gives via conduit 19 a control air pressure signal to the controllable valves 21 and 4 for the supply of gas.
  • This signal varies in a certain range, e.g. from 1 to 2 bar.
  • control device 18 finds that there is an insufficient pressure difference across orifice plate 12, and increases the controlling air pressure in conduit 19.
  • a second kind of gas which cannot be condensed such as compressed air, is supplied from a source of compressed air 20 via controllable valve 21 and conduit 22.
  • valve 21 At the maximum controlling pressure, valve 21 is in the fully open position, and at approximately half the value of the controlling air pressure range, it is fully closed.
  • control device 18 As steam and air flow into the cylinder, heat transfer by the steam will be decreased, and a mixture of steam and air will flow through the orifice plate. If control device 18 now finds that the adjusted threshold value of the pressure difference across orifice plate 12 is exceeded, it decreases the control pressure in conduit 19 to such an extent that via valve 21 for the compressed air an equilibrium is reached.
  • control device 18 will find that the pressure difference across orifice plate 12 is too high, while the valve for the compressed air is already closed. In that case the controlling air pressure in conduit 19 is decreased to below approximately half the value of the control pressure range.
  • Conduit 19 is connected via a relay 23 to valve 4.
  • Relay 23 operates as follows: If control pressures of four different levels are supplied, only the lowest level is passed to valve 4, and the others are ignored. In the embodiment shown, control valve 4 is open at a control pressure approximately halfway the control pressure range, and closed at the minimum control pressure.
  • relay 23 may have three other functions:
  • the great advantage of the method according to the invention is that the amount of steam supplied to the cylinders can be very accurately controlled, and limited to a minimal quantity without the occurrence of any problems with regard to the flooding of the cylinder with condensate, but the method also permits an accurate control of the amount of heat given up to the paper web, and minimizes loss in energy. In addition, by controlling the amount of compressed air supplied, optimal de-watering with a minimal amount of energy is possible.
  • control system such as receptacle and source of steam for a plurality of cylinders, but in any case it is necessary for every cilinder to have its own separator, orifice plate and control circuit.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP82201286A 1982-10-14 1982-10-14 Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier Expired EP0105975B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT82201286T ATE17879T1 (de) 1982-10-14 1982-10-14 Verfahren zum abfuehren des kondensates aus einem zylinder, insbesondere einem zylinder zum trocknen von papier.
DE8282201286T DE3268994D1 (en) 1982-10-14 1982-10-14 A method for removing condensate from a cylinder, in particular a cylinder for drying paper
EP82201286A EP0105975B1 (de) 1982-10-14 1982-10-14 Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82201286A EP0105975B1 (de) 1982-10-14 1982-10-14 Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier

Publications (2)

Publication Number Publication Date
EP0105975A1 true EP0105975A1 (de) 1984-04-25
EP0105975B1 EP0105975B1 (de) 1986-02-05

Family

ID=8189523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201286A Expired EP0105975B1 (de) 1982-10-14 1982-10-14 Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier

Country Status (3)

Country Link
EP (1) EP0105975B1 (de)
AT (1) ATE17879T1 (de)
DE (1) DE3268994D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0763625A2 (de) * 1995-09-18 1997-03-19 Voith Sulzer Papiermaschinen Gesellschaft mbH Vorrichtung für eine Papiermaschine zur Förderung von Flüssigkeit von einem ersten Niveau auf ein zweites, höheres Niveau
US8046671B2 (en) 2005-07-04 2011-10-25 Nokia Siemens Networks Gmbh & Co. Kg Method and apparatus for adapting data to a transport unit of a predefined size prior to transmission
CN102392383A (zh) * 2011-10-31 2012-03-28 李永华 一种基于尾气流量检测的蒸汽冷凝水热泵系统
CN109653018A (zh) * 2019-01-28 2019-04-19 湖南南杰电材科技有限公司 一种云母纸烘缸组件

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102106A (en) * 1936-10-21 1937-12-14 William S Allen Apparatus for discharging condensate from drying drums
US2291131A (en) * 1940-08-19 1942-07-28 Arnstrong Machine Works Temperature control for driers and other heat exchange elements
US2869248A (en) * 1955-10-17 1959-01-20 Beloit Iron Works Condensate removal control for paper machine dryers
US2992493A (en) * 1958-04-16 1961-07-18 Worthington Corp Method and apparatus for controlling and limiting the quantity of "blowthru" steam in a drying system
US4222178A (en) * 1979-07-16 1980-09-16 Midland-Ross Corporation Method and apparatus for controlling a drying cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102106A (en) * 1936-10-21 1937-12-14 William S Allen Apparatus for discharging condensate from drying drums
US2291131A (en) * 1940-08-19 1942-07-28 Arnstrong Machine Works Temperature control for driers and other heat exchange elements
US2869248A (en) * 1955-10-17 1959-01-20 Beloit Iron Works Condensate removal control for paper machine dryers
US2992493A (en) * 1958-04-16 1961-07-18 Worthington Corp Method and apparatus for controlling and limiting the quantity of "blowthru" steam in a drying system
US4222178A (en) * 1979-07-16 1980-09-16 Midland-Ross Corporation Method and apparatus for controlling a drying cylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0763625A2 (de) * 1995-09-18 1997-03-19 Voith Sulzer Papiermaschinen Gesellschaft mbH Vorrichtung für eine Papiermaschine zur Förderung von Flüssigkeit von einem ersten Niveau auf ein zweites, höheres Niveau
EP0763625A3 (de) * 1995-09-18 1998-05-06 Voith Sulzer Papiermaschinen Gesellschaft mbH Vorrichtung für eine Papiermaschine zur Förderung von Flüssigkeit von einem ersten Niveau auf ein zweites, höheres Niveau
US8046671B2 (en) 2005-07-04 2011-10-25 Nokia Siemens Networks Gmbh & Co. Kg Method and apparatus for adapting data to a transport unit of a predefined size prior to transmission
CN102392383A (zh) * 2011-10-31 2012-03-28 李永华 一种基于尾气流量检测的蒸汽冷凝水热泵系统
CN109653018A (zh) * 2019-01-28 2019-04-19 湖南南杰电材科技有限公司 一种云母纸烘缸组件

Also Published As

Publication number Publication date
EP0105975B1 (de) 1986-02-05
ATE17879T1 (de) 1986-02-15
DE3268994D1 (en) 1986-03-20

Similar Documents

Publication Publication Date Title
US4447964A (en) Dryer drainage by recirculation with primary and secondary dryers
US5211813A (en) Steam shower with reduced condensate drip
GB2064613A (en) Felt dewatering system
US4493158A (en) Method and apparatus for removing condensate from a cylinder, in particular a cylinder for drying paper
US4115265A (en) Method and apparatus for dehydrating suspension
NO147391B (no) Fremgangsmaate for loesgjoering, foering og pressing av en papirbane i vaatpartiet til en papirmaskin
EP0105975A1 (de) Verfahren zum Abführen des Kondensates aus einem Zylinder, insbesondere einem Zylinder zum Trocknen von Papier
US4398355A (en) Steam distribution apparatus
US2811787A (en) Removal of condensate from dryer rolls
EP0290427B1 (de) Differenz-druckregler für trockner
US2869248A (en) Condensate removal control for paper machine dryers
US3017289A (en) Method of preparing photographic materials
US3338411A (en) Method for dewatering coal slurries
FI69139B (fi) Foerfarande foer behandling av cellulosamassa i kontinuerlig flytande stroem genom anvaendning av ett trycktaett kaerl medett massainlopp och ett massautlopp och ett inlopp foer b ehndlingsvaetskan och ett utlopp foer separeringsvaetskan
GB2064718A (en) Drying cylinder for paper machines
US3057402A (en) Silent suction roll assembly
US4194299A (en) Condensate discharging device
US5879513A (en) Method and apparatus for the drainage of the wire and/or press section of a paper machine
US2992493A (en) Method and apparatus for controlling and limiting the quantity of "blowthru" steam in a drying system
KR200195271Y1 (ko) 제지 건조 시스템
US2515651A (en) Steam heating system
CA1063523A (en) Apparatus for continuous separation of a suspension liquid from a fibrous suspension
SU915869A1 (ru) Способ регулирования процесса выпаривания 1
SU1174708A1 (ru) Сушилка дл термолабильных биологических продуктов
JPS5949881B2 (ja) 合成樹脂チツプの連続向流乾燥方法

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: 19830913

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 17879

Country of ref document: AT

Date of ref document: 19860215

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: NOTARBARTOLO & GERVASI S.R.L.

REF Corresponds to:

Ref document number: 3268994

Country of ref document: DE

Date of ref document: 19860320

ET Fr: translation filed
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
ITTA It: last paid annual fee
EPTA Lu: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 82201286.0

REG Reference to a national code

Ref country code: CH

Ref legal event code: PUE

Owner name: KONINKLIJKE NEDERLANDSE PAPIERFABRIEKEN N.V. -DANN

NLS Nl: assignments of ep-patents

Owner name: KNP LEYKAM SERVICES B.V.

NLT1 Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1

Owner name: N.V. KONINKLIJKE KNP BT;N.V. KONINKLIJKE KNP

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Ref country code: FR

Ref legal event code: CD

Ref country code: FR

Ref legal event code: CA

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

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

Ref country code: GB

Payment date: 19991013

Year of fee payment: 18

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

Ref country code: FR

Payment date: 19991019

Year of fee payment: 18

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

Ref country code: CH

Payment date: 19991021

Year of fee payment: 18

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

Ref country code: SE

Payment date: 19991022

Year of fee payment: 18

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

Ref country code: AT

Payment date: 19991025

Year of fee payment: 18

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

Ref country code: DE

Payment date: 19991028

Year of fee payment: 18

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

Ref country code: NL

Payment date: 19991029

Year of fee payment: 18

Ref country code: LU

Payment date: 19991029

Year of fee payment: 18

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

Ref country code: BE

Payment date: 19991118

Year of fee payment: 18

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

Ref country code: LU

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

Effective date: 20001014

Ref country code: GB

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

Effective date: 20001014

Ref country code: AT

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

Effective date: 20001014

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

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 20001030

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

Ref country code: LI

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

Effective date: 20001031

Ref country code: CH

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

Effective date: 20001031

Ref country code: BE

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

Effective date: 20001031

BERE Be: lapsed

Owner name: KNP LEYKAM SERVICES B.V.

Effective date: 20001031

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

Ref country code: NL

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

Effective date: 20010501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20001014

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 82201286.0

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: 20010629

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20010501

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: 20010703

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST