EP1706694A2 - Dispositif et procede permettant de secher un film humide - Google Patents

Dispositif et procede permettant de secher un film humide

Info

Publication number
EP1706694A2
EP1706694A2 EP04808716A EP04808716A EP1706694A2 EP 1706694 A2 EP1706694 A2 EP 1706694A2 EP 04808716 A EP04808716 A EP 04808716A EP 04808716 A EP04808716 A EP 04808716A EP 1706694 A2 EP1706694 A2 EP 1706694A2
Authority
EP
European Patent Office
Prior art keywords
steam
jacket
outflow
cylinder
condensate
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Withdrawn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
EP04808716A
Other languages
German (de)
English (en)
Inventor
Franklin Hubertus Truijens
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1706694A2 publication Critical patent/EP1706694A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • F26B13/183—Arrangements for heating, cooling, condensate removal

Definitions

  • the invention relates to a device for drying a wet film, such as a paper web, comprising at least one rotatable, at least substantially closed cylinder, which comprises a jacket that encases a steam space, film transporting means for carrying the film towards and away from the outer surface of the jacket, and steam conveying means for supplying steam to the steam space and for discharging steam and/or condensate from the steam space , said steam conveying means comprising a steam supply pipe and an outflow opening.
  • film is to be understood to include a thin layer of loose material, such as potato mash and the like.
  • the thickness of the condensate may be minimised (syphons), turbulence may be generated in the film (stator bars) and a higher steam pressure may be used. Examples of this are to be found in US 6,012,234 and in US 4,924, 603.
  • the steam not only contains water vapour but also a gas that does not condense under the prevailing conditions, said gas will impede the condensation of the water vapour.
  • Said gas collects directly above the film, its concentration increasing as the condensation of the steam progresses. The higher the concentration of the non-condensing gases, the greater the extent to which the gas impedes the condensation of the water vapour and the more the flow of heat decreases.
  • Said non-condensing gas is usually removed (by exhaustion) before the drying process is started; when the drying process is in progress, this can only take place by simultaneously blowing off the supplied steam.
  • the selected applications are limited to those applications in which the presence of non-condensing gases can be excluded (airtight) orn which said presence impedes the process.
  • An example of this is described in US 4,223,452.
  • Applications in which the presence of non-condensing gases is admitted generally employ heat transfer to another medium (indirect MVR) , which requires the provision of additional heat exchangers; this is a negative effect on the energy efficiency, it increases the cost price and leads to an increased complexity.
  • Indirect MVR indirect MVR
  • An example is to be found in US 4,523,388 and in DE 3,307,358.
  • the object of the invention is to provide an improved device, which overcomes the drawbacks of the known devices.
  • At least the main portion of the outflow opening extends near the inner surface of the jacket, in such a manner that, in use, the steam can flow out into the layer of liquid being formed on the inner surface of the rotating jacket when the steam condenses.
  • the steam (containing non-condensing gases) is preferably introduced into the cylinders via a pipe and flows (in finely distributed form) into the condensate layer near the inner side of the cylinder; as a result of a difference in speed between the outflow opening and the condensate layer a "bubble condenser" is formed: the steam is divided into small bubbles in the condensate layer; this leads to a large heat-exchanging area and intense mixing of the condensate.
  • the non-condensing gas remains behind in the bubble; the bubbles float up through the layer of condensate to the core of the cylinder.
  • a controlled discharge of non-condensing gas from the core makes it possible to maintain the concentration of non-condensing gas at a desired value.
  • the steam is introduced into the rotating cylinder not above the layer of condensate but in the layer of condensate, with the layer of condensate separating the collected non-condensing gas from the condensation of the bubble flow.
  • the vapour that is supplied may comprise only water vapour but also a mixture of water vapour and gases, liquid vapours, solid matter particles or liquid particles.
  • Present in the cylinder is an amount of condensate (mainly water) , which distributes more or less over the cylinder circumference if the cylinder rotates to a sufficient degree.
  • the condensate fills the cylinder only partially.
  • a core of the cylinder may be filled with residual vapour.
  • one or more outflow openings are fixed in position in the device; the relative speed between the condensate and the outflow openings is determined by the rotational speed of the cylinder in that case.
  • one or more outflow openings are provided on a shaft capable of rotation within the cylinder.
  • the shaft projects from the cylinder on one or two sides or on neither side) .
  • Mounted on said shaft are means (an electric motor or a slipping brake) which, controlled from outside, causes the shaft to rotate at a rotational speed which is different from the rotational speed of the cylinder.
  • the relative speed between the condensate and the outflow openings is determined by the difference in the aforesaid two rotational speeds and the directions of rotation. A change in the rotational speed and the direction of rotation has an influence on the amount of vapour that is introduced, and thus on the heat flow.
  • One or more outflow openings are provided with an acoustic resonance chamber which effects changes in the vapour pressure at a high-frequency, thus supporting or enhancing the formation of a flow of bubbles.
  • the shape and the position of one or more outflow elements and outflow openings in the cylinder is imparted, a certain turbulence and/or a certain direction is imparted to the movement of the outflowing vapour and/or to the movement of the condensate portion, so that the vapour flow passes into a finely distributed flow of bubbles, which is conducive to the heat transfer to the cylinder wall.
  • the shape and the position of one or more outflow elements are such that a hydrodyna ic bearing force is generated when the aforesaid relative movement between the outflow element and the inner side of the cylinder takes place, which force increases as the spacing between the outflow element and the inner wall of the cylinder decreases (spring-loaded bearing).
  • the shape and the position of one or more outflow elements are such that the vapour is introduced into the layer of condensate as a thin film when the aforesaid relative movement between the outflow element and the inner side of the cylinder takes place.
  • the invention further relates to a method for drying a wet film, such as a paper web, wherein at least one, at least substantially closed cylinder comprising a jacket that encases a steam space is rotated, wherein the film is carried towards and away from the outer surface of the rotating jacket, and wherein steam is supplied to the steam space and steam and/or condensate is discharged from said steam space, and wherein at least the larger part of the steam is introduced into the steam space near the inner surface of the jacket.
  • a wet film such as a paper web
  • Fig. 1 is a schematic view of a device for drying paper
  • Fig. 2 is a schematic, perspective view of a steam-heated cylinder
  • Figs. 3, 4, 5 and 6 are partial cross-sectional views of a steam-heated cylinder.
  • a wet paper web 2 is passed over steam- heated cylinders 3 in a paper-making machine 1; the paper web may be supported by one or more dryer fabrics or felts .
  • the drying section (the cylinders 3) is enclosed by a jacket 4, into which the wet paper web is guided at 5 and from which dried paper web exits at 6; the jacket 4 may consist of rigid elements (a casing or a hood) , flexible elements and/or removable elements, gaseous substances cannot pass therethrough, or only to a limited extent, and it can withstand a temperature of at least 100 °C.
  • the aforesaid cylinders have an surface temperature of at least 100 °C on the outside, and as a result of the contact between the paper web and the aforesaid cylinders, the temperature of the water contained in the paper web increases to the boiling point. At said boiling point, the water in the paper web turns from the liquid phase into the vapour phase and exits the paper web.
  • the vapour pressure inside the jacket is at least equal to the air pressure directly outside the jacket (about 1 bar) or slightly higher.
  • Said vapour is exhausted by a mechanical compressor 7 and compressed to a higher pressure (e.g. 5 bar); mechanical energy is supplied during this process.
  • the vapour temperature will be equal to or higher than the condensation temperature associated with the aforesaid higher pressure.
  • the vapour which is under an elevated pressure, is carried to the steam cylinders via pipes 8 and flows into the condensate 12 at a position close to the inner side of the cylinder 11 via a pipe 9 and the outflow element 10; said condensate has a temperature which is lower than the condensation temperature at the elevated pressure.
  • the aforesaid pipe 9 and the outflow element 10 are fixed in the bearings 13 and 14 of the cylinders, so that they may or may not be capable of rotation within the cylinder 3, in such a manner that the outflow element and the inner side 11 of the cylinder wall rotate at a relative rotational speed about the imaginary axis through the bearings 13 and 14.
  • the vapour flow exiting the outflow element is distributed over the entire circumference of the inner side 11 of the cylinder wall .
  • the outflow element 10 is present in the condensate at a fixed, preferably minimum distance from the inner side 11 of the cylinder wall, being shaped and positioned such that in the case of a relative movement between the outflow element and the cylinder, the condensate portion A 20, which constitutes the larger part of the condensate, is passed over the outflow element, and the condensate portion B 21, which constitutes the smaller part of the condensate, is passed between the outflow element 10 and the inner side of the cylinder wall.
  • the vapour Downstream of the outflow element the vapour is trapped by the condensate portions A and B, in which it can condense, thereby releasing its heat of condensation.
  • One embodiment of the pipe 9 and the outflow element 10 may be selected with a view to obtaining a minimum flow resistance of the two elements upon moving through the condensate.
  • the shape and the position of the outflow element are furthermore such that a sufficient amount of vapour can flow out during the aforesaid relative movement between the outflow element and the inner side of the cylinder.
  • the shape and the position of the outflow element 10 and the outflow opening 22 make it possible to impart turbulence and/or direction to the movement of the outflowing vapour and to the movement of the condensate portion; this achieves that:
  • the vapour is split up into a large number of small vapour bubbles, - the vapour is brought as close to the wall as possible, and that as long as possible,
  • a lifting force acts on the flow element, in a direction towards or away from the cylinder wall.
  • the outflow opening may be provided with an acoustic resonance chamber 23, as is shown in Fig. 5, which effects changes in the vapour pressure at a high frequency, thus supporting or enhancing the formation of the flow of bubbles.
  • the shape and the position of the outflow element are furthermore such that a hydrodynamic bearing force acts on the flow element (similar to a hydrodynamic bearing) when the aforesaid relative movement between the outflow element and the inner side of the cylinder takes place, as is shown in the embodiment of Fig. 6.
  • a suitable selection of materials of an elastic nature enables the outflow element to adapt its shape and its position upon being subjected to a load.
  • a suitable selection of materials furthermore makes it possible for the surface quality of the outflow element to contribute to the formation of bubbles (contact angle) and/or to the flow resistance. If not all the vapour being supplied can condense at a position close to the cylinder wall, the excess vapour will flow through the condensate 12 to the core 15, with part of the vapour condensing in the condensate 12 (Fig. 3) .
  • the thickness of the condensate may be greater than usual.
  • the condensate film has two functions, viz. maintaining a separation between the high concentration of gas in the core
  • the residual vapour in the core 15 may condense on the surface
  • the gas may also be discharged via a separate, closable pipe.
  • one or more vapour pipes 9, one or more outflow elements 10, one or more condensate pipe 17 and one or more inflow openings 18 having the same effect may be used.
  • the temperature of the condensate is measured.
  • the pressure of the vapour supplied to the cylinders is measured, as is the associated physically determined condensation temperature of water. If the difference between the temperature of the condensate and the condensation temperature exceeds a control value, a control element will open the pipe in question to a greater or lesser extent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention concerne un dispositif permettant de sécher un film humide, tel qu'une bande de papier, lequel dispositif comprend au moins un cylindre rotatif au moins essentiellement fermé comprenant une enveloppe qui renferme un espace de vapeur ; un moyen d'acheminement du film conçu pour transporter le film à proximité et à distance de la surface extérieure de l'enveloppe ; et un moyen d'acheminement de la vapeur conçu pour fournir de la vapeur à l'espace de vapeur et pour évacuer la vapeur et/ou le condensat de l'espace de vapeur. Le moyen d'acheminement de la vapeur comprend un tuyau d'alimentation de vapeur et une ouverture d'évacuation. La portion principale de l'ouverture d'évacuation s'étend à proximité de la surface intérieure de l'enveloppe, de telle sorte que, pendant l'utilisation, la vapeur puisse s'échapper dans la couche du liquide formé sur la surface intérieure de l'enveloppe pivotante lorsque la vapeur se condense.
EP04808716A 2003-11-21 2004-11-15 Dispositif et procede permettant de secher un film humide Withdrawn EP1706694A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1024837A NL1024837C2 (nl) 2003-11-21 2003-11-21 Inrichting en werkwijze voor het drogen van een natte film.
PCT/NL2004/000800 WO2005050111A2 (fr) 2003-11-21 2004-11-15 Dispositif et procede permettant de secher un film humide

Publications (1)

Publication Number Publication Date
EP1706694A2 true EP1706694A2 (fr) 2006-10-04

Family

ID=34617596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04808716A Withdrawn EP1706694A2 (fr) 2003-11-21 2004-11-15 Dispositif et procede permettant de secher un film humide

Country Status (3)

Country Link
EP (1) EP1706694A2 (fr)
NL (1) NL1024837C2 (fr)
WO (1) WO2005050111A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103148685A (zh) * 2013-03-05 2013-06-12 包中臣 蔺草席烘干机烘干腔结构

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1189761A (en) * 1914-10-22 1916-07-04 Ambrose H White Drying-cylinder.
US1521223A (en) * 1919-01-21 1924-12-30 Robert H Wyld Process and apparatus for drying
GB256701A (en) * 1925-05-14 1926-08-16 John Bolton Improvements relating to steam heated cylinders
GB245031A (en) * 1925-07-30 1925-12-31 John Melrose Arnot Improvements in or relating to apparatus for draining water from steam-heated rotarycylinders and the like
GB469712A (en) * 1936-11-26 1937-07-30 Henry Archibald Kingcome Improvements in or relating to the application of steam and extraction of condensate from rotating steam-heated appliances
US3426839A (en) * 1966-12-05 1969-02-11 Glen Overton Drying cylinder
US4223452A (en) 1979-02-12 1980-09-23 Chambers John M Drying process and apparatus for accomplishing the same
FR2510736B1 (fr) 1981-07-28 1986-07-18 Beghin Say Sa Procede de sechage par recompression de vapeur
AT374214B (de) 1982-03-03 1984-03-26 Stroemungsmasch Anst Einrichtung an dunsthauben der trockenpartie von papiermaschinen
DE3801815A1 (de) 1988-01-22 1989-08-03 Voith Gmbh J M Vorrichtung zum abfuehren von kondensat aus einem dampfbeheizten trockenzylinder oder dergleichen mittels eines rotierenden siphons
DE19654345A1 (de) 1996-12-24 1998-06-25 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer kontinuierlichen Materialbahn

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005050111A3 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103148685A (zh) * 2013-03-05 2013-06-12 包中臣 蔺草席烘干机烘干腔结构

Also Published As

Publication number Publication date
WO2005050111A3 (fr) 2005-08-25
NL1024837C2 (nl) 2005-05-26
WO2005050111A2 (fr) 2005-06-02

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