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EP0528160B1 - Diffuseur de vapeur - Google Patents

Diffuseur de vapeur Download PDF

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Publication number
EP0528160B1
EP0528160B1 EP92111543A EP92111543A EP0528160B1 EP 0528160 B1 EP0528160 B1 EP 0528160B1 EP 92111543 A EP92111543 A EP 92111543A EP 92111543 A EP92111543 A EP 92111543A EP 0528160 B1 EP0528160 B1 EP 0528160B1
Authority
EP
European Patent Office
Prior art keywords
steam
blow
chamber
chest according
steam blow
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.)
Expired - Lifetime
Application number
EP92111543A
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German (de)
English (en)
Other versions
EP0528160A1 (fr
Inventor
Stefan H. Winheim
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.)
VIB Apparatebau GmbH
Original Assignee
VIB Apparatebau GmbH
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
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Application filed by VIB Apparatebau GmbH filed Critical VIB Apparatebau GmbH
Publication of EP0528160A1 publication Critical patent/EP0528160A1/fr
Application granted granted Critical
Publication of EP0528160B1 publication Critical patent/EP0528160B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers

Definitions

  • the invention relates to a steam blow box for applying steam to a passing material web with at least one steam blow chamber, which is completely enclosed by a free housing wall with a number of steam outlet openings and further chamber walls and has a steam valve for the inlet of steam into the steam blow chamber.
  • Such a steam blow box is known from DE 37 01 407 C1.
  • Such steam blow boxes are mainly used in papermaking.
  • the known steam blower box serves to raise the temperature of the material web with the help of the steam applied to the material web in order to facilitate the dewatering of the material web.
  • Another use of steam blow boxes is the application of steam to the surface of the material web before a surface treatment such as is carried out, for example, with so-called soft compact calenders.
  • the surface of the material web can be smoothed, for example.
  • the soft rolls wear out during operation and have to be renewed from time to time.
  • the time required to replace such a soft roller is on the order of a few tens of minutes, for example 20 minutes.
  • the treatment of the material web is interrupted during this time. Since steam does not have to be applied to the material web during this time, the steam blowing chamber does not become one either Fresh steam supplied.
  • the steam-blowing chamber cools down and the steam still in it condenses. Although a large part of the condensed water can be removed via a drain, this has the disadvantage that a considerable amount of steam is required when restarting after the roll change in order to heat up the water remaining in the steam-blowing chamber and to convert it back into steam.
  • EP-A-0 275 914 shows a similar steam blow box, the housing of which at the beginning of the inlet zone and at the end of the outlet zone each has a wall element which is at a smaller distance from the material web than the housing part in which the steam outlet openings are arranged. These wall elements are steam-heated so that water parts located on the outside evaporate, so they cannot have a detrimental effect on the material web.
  • DE-OS 22 03 973 describes a method and an apparatus for moistening a web.
  • steam is sprayed from lines directly onto a material web, which is supported at the spray point by a tempered roller or another guide.
  • the lines are routed within a housing wall delimiting a space.
  • the steam jet directed onto the material web is also directed towards the room, so that steam reflected from the material web enters the room.
  • the housing inner walls can be heated will be provided or devices for discharging drip liquid from the web area. This largely prevents dripping of liquid onto the web during operation.
  • the measures are not sufficient to ensure, even when starting off, that the steam acting on the material web is at least largely free of droplets.
  • WO 91/14045 which was published after the filing date of the present application, discloses a device for applying steam, in which two steam channels or lines branch off from a steam feed line. The first is used to heat a series of steam distribution rooms connected in series. The second serves as a feed line for feeding the first of the steam distribution rooms.
  • the problem also arises here that when restarting after an interruption in operation condensed steam can lead to water droplets. Recognizing this deficiency, wire nets or meshes are arranged in the steam path in the known device, on which such liquid droplets are to be deposited.
  • the invention has for its object to provide a steam blow box, with which the treatment of the material web can be continued faster after a roll change.
  • Sufficient heat is introduced into the interior of the steam-blowing chamber via the heated wall of the steam-blowing chamber, so that the steam in the steam-blowing chamber can no longer or no longer condense to the extent known to date.
  • the steam-blowing chamber is therefore kept at an elevated temperature even when the production process is interrupted, for example when changing the rolls.
  • the steam fed into the steam-blowing chamber after restarting then no longer has to be used to heat the steam-blowing chamber, but rather can perform its intended functions, namely the application of pressure to the surface of the web.
  • the risk of droplets forming in the steam-blowing chamber is significantly reduced, so that damage to the material web no longer occurs, even if the downtimes are longer than planned.
  • the first and the second steam channel form the two legs of a U, so to speak.
  • the base of the U forms the connection between the first and the second steam channel.
  • All steam-blowing chambers are then flowed around by steam on at least two sides, so that at least two walls of the steam-blowing chambers are heated.
  • liquid droplets that may have formed during the transport of the steam from the boiler to the steam blow box are separated. The heating then takes place exclusively with dry steam. Since the steam used for loading the material web is only removed after the steam drying section, it is ensured that no condensate droplets can get onto the material web.
  • the steam valve and the heater are connected to the same steam supply connection. No separate steam supply connection is then necessary for the heating device.
  • a single line is sufficient, which connects a steam source, for example a boiler, to the steam blower box.
  • the advantage here is that at least the free housing wall is heated. If water drops have formed, they will be moved in the direction of the free housing wall by the escaping steam. If they hit the free housing wall, they will evaporate there.
  • the heating device preferably has at least one steam channel which is delimited on one side by the heated wall.
  • the steam duct forces the steam to flow along the wall to be heated. Here he gives off heat to this wall and heats it.
  • a plurality of steam blow chambers separated by partitions are arranged side by side in a row transversely to the running direction of the material web, the heating device having at least one steam channel which heats all steam blow chambers. Accordingly, this steam-blowing duct is also arranged transversely to the running direction of the material web. With this relatively simple measure, all steam blow chambers can be heated to some extent evenly.
  • approximately U-shaped profiles are applied to the free housing wall, which run essentially parallel to the second steam channel, the opening of the U being covered by the free housing wall.
  • the free housing wall is so thin that it cannot accommodate steam channels.
  • the steam used to heat the free housing wall must be channeled, since it would otherwise act on the passing material web to the same extent as the free housing wall.
  • the U-shaped profiles are provided for this purpose. Since there is a pressure difference between the two ends of the second steam channel and the U-shaped profiles run essentially parallel to the second steam channel, a steam flow also arises in the channels formed by the U-shaped profiles, so that the free housing wall in its entire width or , with multiple steam chambers, the free housing walls of all steam chambers are evenly heated.
  • the profiles advantageously run between the steam outlet openings. This allows a strict separation between the steam used to heat the steam blow chambers and the steam used to treat the material web.
  • the partitions have heating channels which connect the first and the second steam channels to one another.
  • five of the six are then the steam blow chamber Heated walls. It can be operated at relatively low temperatures since the steam chamber is heated from almost all sides. The temperature gradient inside the steam chamber is relatively flat.
  • the first and the second steam channel protrude towards the material web opposite the free housing wall.
  • the edges of the steam box are heated.
  • each steam valve can be controlled individually.
  • the amount of steam or the steam pressure that is applied to the material web from each steam blowing chamber can then be controlled over the width of the material web. This enables control of the moisture profile.
  • the steam valve preferably has a number of valve nozzles, the axis of which encloses an angle in the range from 69 ° to 75 ° with the side walls of the steam blowing chamber.
  • the steam that flows out of the valve has a strong component towards the wall.
  • it is reflected on the wall at an appropriate angle, so that there is a very even distribution of steam in the steam chamber.
  • the uniformity of the steam distribution in the steam blower chamber also results in a very uniform steam outlet profile on the free housing wall, ie the steam emerges from all steam outlet openings at approximately the same speed. It is therefore not necessary to take any measures to disarm individual steam jets that could hit the material web. Due to the uniform distribution of the steam, the pressure in the steam-blowing chamber can also be kept relatively low, so that the exit noise is reduced.
  • the steam-blowing chamber preferably has a water outlet opening in the region of the free housing wall and / or in the region of the wall opposite the free housing wall.
  • the steam blow boxes are arranged so that they are above or below the material web.
  • the free housing wall is then on the top or on the bottom of the steam blower box, but is in any case facing the material web. If larger amounts of condensed water are produced, they can easily flow away from the lowest point of the steam chamber. If the steam blower box is located above the material web, this is arranged in the area of the free housing wall, if the steam blower box is located below the material web, on the opposite side. This saves you from having to heat the steam blower chamber, for example at the start of operation, until all of the liquid has evaporated.
  • the water outlet opening is preferably connected to a siphon in which there is a permanent water column that is higher than a target pressure in the steam-blowing chamber.
  • the water column forms the counterweight to the vapor pressure. Since the water column exerts a higher pressure than the set pressure in the steam chamber, no steam can escape through the siphon. On the other hand, condensed water can flow off unhindered.
  • the steam outlet openings preferably have a diameter which is smaller than the thickness of the free housing wall.
  • Directional steam jets are thus generated on the outside of the free housing wall, which are suitable for effectively applying the steam to the material web.
  • the at least one wall in the steam-blowing chamber advantageously has a temperature in the range between 102 ° C. and 110 ° C. Such a temperature is sufficient to prevent the steam from condensing in the steam blowing chamber.
  • a steam blow box 1 has a plurality of steam blow chambers 2, which are separated from a free housing wall 3 and further walls, namely a front wall 4, a rear wall 5, a left side wall 6 and a right side wall 7 or an intermediate wall 8, which separates individual steam blow chambers 2, and a ceiling 9 is limited.
  • a steam valve 10 opens into the steam blowing chamber 2. Each steam valve 10 can be controlled individually via a drive 11.
  • the steam blow box has a first steam channel 12 and a second steam channel 13, which are connected to one another via a connecting channel 14.
  • a throttle device 15 can be arranged between the connecting duct 14 and the second steam duct 13 his.
  • the throttle device 15 is shown here as a discrete element. However, it can also be formed by the geometry of the individual steam channels 13 and 14. The only decisive factor is that the throttle device 15 creates a pressure difference between the connecting duct 14, that is to say the beginning of the second steam duct 13, and the end of the second steam duct 13.
  • the first steam channel 12 is connected to a steam connection 16 via which steam is fed into the steam blower box.
  • the end of the second steam duct 13, that is to say the end of the second steam duct 13 facing away from the connecting duct 14, is connected to an outlet 17, at which steam or water condensed from the steam can flow out of the steam blower box 1.
  • the steam in the first and second steam channels 12, 13 flows around the steam blowing chambers 2 in an approximately U-shape, i.e. the front wall 4 and the rear wall 5 of each steam-blowing chamber 2 are connected on their outside to the steam flowing in the steam channels 12, 13.
  • the steam gives off heat to the walls 4, 5 here.
  • the walls 4, 5 in turn heat the steam-blowing chamber 2 again.
  • the left side wall 6 and the right side wall 7 are also heated by the steam flowing past.
  • U-shaped profiles 18 are welded to the intermediate walls 8, which separate two adjacent steam-blowing chambers 2, in such a way that the open end of the U is covered by the intermediate walls 8.
  • the channels 19 formed in the profiles are sealed so that the steam which has been fed into the steam blowing chamber 2 via the steam valve 10 does not coincide with the steam in the channels 19 comes into contact and is mixed.
  • the partition walls 8 are thus also heated.
  • Similar profiles 20 are attached to the outside of the free housing wall 3. They form channels 21 which extend across the width of the steam-blowing chambers transversely to the running direction of a web 22.
  • the steam valves 10 are connected to the second steam channel 13 via connecting pipes 24.
  • the steam valve 10 has a series of openings 25 which are directed so that their axis forms an angle A with the side walls, i.e. the front wall 4, the rear wall 5, the left side wall 6, the right side wall 7 or the intermediate wall 8, which is in the range from 69 ° to 75 °. Since the steam valve 10 is essentially cylindrical in shape, but the walls of the steam-blowing chamber 2 essentially form a rectangle, these angles only apply to the openings 25 of the steam valve, which are located in a plane perpendicular to the walls 4 to 8 mentioned. For all other openings, the angle of the axis of the openings 25 must be projected onto the corresponding plane.
  • the first and the second steam channels 12, 13 project in relation to the free housing wall 3 in the direction of the material web 22.
  • a steam spreading space 27 can form between the material web 22 and the free housing wall 3, in which the steam can even out after flowing out of the steam blow-out openings 23.
  • the housing of the steam blower box 1 is also heated at its edges 28, 29 facing the material web 22.
  • the first steam channel 12 is designed as a steam drying section.
  • the steam supplied via the steam connection 16 can contain condensed steam in the form of water droplets, in particular if the path from the steam source, such as a steam boiler, to the steam blow box is longer. These water droplets are separated in the first steam channel 12. With this simple measure, it can be achieved that the steam after the first steam channel 12 is dry, so that it can be used directly as process steam for loading the material web 22.
  • Drain openings 30, 31, 32 and 33 are arranged at the lowest points of the steam blower chamber 2 or the first or second steam channel 12, 13 or also the connecting channel 14. Water which condenses in the steam blowing chamber 2 or in the steam channels 12, 13, 14 can flow through these openings.
  • the drain openings 30 to 33 are provided in the event that the steam blower box 1 is operated as shown in FIGS. 1 and 2, namely with the free housing wall 3 downwards.
  • the steam blower box 1 is located above the material web 22.
  • further drain openings 34, 35, 36 are provided at the highest points.
  • the steam blow box 1 can be arranged not only above the material web, the steam flowing out of the steam blowing chamber 2 downwards, but also below the material web 22, the steam flowing upwards.
  • the drain openings 34, 35, 36 which are in the position shown in FIGS. 1 and 2 at the highest point, are at the lowest point of the Steam blowing chamber or the steam channels 12, 13 arranged.
  • the connecting channel 14 can also have such a drain opening.
  • the drain opening 35 is connected to a siphon 37.
  • the steam blow box is operated in a position rotated by 180 ° C., that is to say the material web 22 is located above the steam blow box 1.
  • the steam blowing chamber 2 is then dewatered via the opening 35 and the siphon 37.
  • the siphon 37 two water columns are formed on the principle of communicating tubes.
  • the free gas passage through which steam could escape is blocked between the outlet opening 35 and the outlet of the siphon.
  • the water column is so high that it withstands the pressure prevailing in the steam blowing chamber 2, that is to say it cannot be pushed out of the siphon 37 to the extent that steam can escape.
  • water can flow out on the other side of the siphon 37, that is to say at the outlet thereof, since an equilibrium must be established again according to the principle of the communicating tubes. Drainage via a siphon is used for all drain openings 30 to 36. For reasons of clarity, however, it is only shown for the drain opening 35.
  • the steam in the first and second steam channels 12, 13, in the connecting channel 14 and in the channels 19 and 21 heats the walls of the steam blowing chamber to a temperature in the range from 102 ° C. to 110 ° C. This temperature is sufficient to prevent condensation on the walls.
  • the entire steam blower box 1 is permanently under steam pressure.
  • the profiles 20 can also be arranged inside the steam-blowing chamber 2, so that the free housing wall 3 is smooth on its outside.
  • the intermediate walls can also be double-walled, in which case the steam flows between the two walls.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Dental Preparations (AREA)
  • Saccharide Compounds (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Coating Apparatus (AREA)

Claims (15)

  1. Diffuseur de vapeur pour répandre de la vapeur sur une nappe de matériau défilant en vis-à-vis, présentant au moins une chambre de projection de vapeur qui est intégralement entourée par la paroi libre d'un boîtier, percée d'un certain nombre d'orifices de sortie de vapeur, et par d'autres parois, et est munie d'une soupape à vapeur pour admettre de la vapeur dans ladite chambre de projection de vapeur, caractérisé par le fait que des parois (3-8) de la chambre (2) de projection de vapeur sont chauffées par l'intermédiaire d'un dispositif de chauffage (19, 21, 12, 12, 14) fonctionnant à la vapeur, le dispositif de chauffage comprenant un premier canal à vapeur (12) réalisé sous la forme d'un segment de séchage de la vapeur et s'étendant, d'une extrémité à l'autre extrémité, pour l'essentiel transversalement par rapport au sens du défilement de la nappe de matériau (22), et un second canal à vapeur (13) qui s'étend, de l'autre extrémité à la première extrémité mentionnée, pour l'essentiel transversalement par rapport au sens du défilement de la nappe de matériau (22), diffuseur dans lequel la chambre (2) de projection de vapeur, prévue au minimum, est interposée entre les premier et second canaux à vapeur (12, 13) ; les premier et second canaux à vapeur (12, 13) sont en communication mutuelle (14) à l'autre extrémité ; la vapeur circule autour de la chambre (2) de projection de vapeur, en décrivant sensiblement un U ; et la vapeur utilisée pour agir sur la nappe de matériau n'est prélevée qu'après le segment de séchage de la vapeur.
  2. Diffuseur de vapeur selon la revendication 1, caractérisé par le fait qu'au moins la paroi libre (3) du boîtier est chauffée.
  3. Diffuseur de vapeur selon la revendication 1 ou 2, caractérisé par le fait que le dispositif de chauffage présente au moins un canal à vapeur (12, 13, 14, 19, 21) délimité, d'un côté, par la paroi chauffée (3, 4, 5, 6, 8).
  4. Diffuseur de vapeur selon l'une des revendications 1 à 3, caractérisé par le fait que plusieurs chambres de projection de vapeur, séparées par des parois intercalaires (8), sont juxtaposées en une rangée transversalement par rapport au sens du défilement de la nappe de matériau (22), le dispositif de chauffage présentant au moins un canal à vapeur (12, 13, 19) qui chauffe toutes les chambres de projection de vapeur.
  5. Diffuseur de vapeur selon les revendications 1 à 4, caractérisé par le fait qu'une différence de pression règne entre les deux extrémités du second canal à vapeur (13).
  6. Diffuseur de vapeur selon l'une des revendications 1 à 5, caractérisé par le fait que des profilés (20) approximativement configurés en U, rapportés sur la paroi libre (3) du boîtier, s'étendent pour l'essentiel parallélement au second canal à vapeur (13), l'ouverture du U étant recouverte par la paroi libre (3) du boîtier.
  7. Diffuseur de vapeur selon la revendication 6, caractérisé par le fait que les profilés (20) s'étendent entre les orifices (23) de sortie de vapeur.
  8. Diffuseur de vapeur selon l'une des revendications 1 à 7, caractérisé par le fait que les parois intercalaires (8) comportent des canaux chauffants (19) qui relient, l'un à l'autre, les premier et second canaux à vapeur (12, 13).
  9. Diffuseur de vapeur selon l'une des revendications 1 à 8, caractérisé par le fait que les premier et second canaux à vapeur (12, 13) font saillie, par rapport à la paroi libre (3) du boîtier, en direction de la nappe de matériau (22).
  10. Diffuseur de vapeur selon l'une des revendications 1 à 9, caractérisé par le fait que chaque soupape à vapeur (10) est commandable individuellement.
  11. Diffuseur de vapeur selon l'une des revendications 1 à 10, caractérisé par le fait que la soupape à vapeur (10) présente un certain nombre de buses distributrices (25) dont l'axe forme, avec les parois latérales (4, 5, 6, 7, 8) de la chambre (2) de projection de vapeur, un angle (A) situé dans la plage de 69° à 75°.
  12. Diffuseur de vapeur selon l'une des revendications 1 à 11, caractérisé par le fait que la chambre (2) de projection de vapeur comporte un orifice (30 à 36) d'évacuation d'eau dans la région de la paroi libre (3) du boîtier, et/ou dans la région de la paroi (9) située à l'opposé de la paroi libre (3) du boîtier.
  13. Diffuseur de vapeur selon la revendication 12, caractérisé par le fait que l'orifice (35) d'évacuation d'eau est relié à un siphon (37) dans lequel se tient, en permanence, une colonne d'eau plus haute que la valeur correspondant à une pression de consigne régnant dans la chambre (2) de projection de vapeur.
  14. Diffuseur de vapeur selon l'une des revendications 1 à 13, caractérisé par le fait que les orifices (23) de sortie de vapeur présentent un diamètre plus petit que l'épaisseur de la paroi libre (3) du boîtier.
  15. Diffuseur de vapeur selon l'une des revendications 1 à 14, caractérisé par le fait que la paroi prévue au minimum présente, dans la chambre (2) de projection de vapeur, une température située dans la plage comprise entre 102°C et 110°C.
EP92111543A 1991-07-29 1992-07-08 Diffuseur de vapeur Expired - Lifetime EP0528160B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4125062A DE4125062C2 (de) 1991-07-29 1991-07-29 Dampfblaskasten
DE4125062 1991-07-29

Publications (2)

Publication Number Publication Date
EP0528160A1 EP0528160A1 (fr) 1993-02-24
EP0528160B1 true EP0528160B1 (fr) 1995-10-11

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EP92111543A Expired - Lifetime EP0528160B1 (fr) 1991-07-29 1992-07-08 Diffuseur de vapeur

Country Status (8)

Country Link
US (1) US5282323A (fr)
EP (1) EP0528160B1 (fr)
JP (1) JPH0816318B2 (fr)
AT (1) ATE129036T1 (fr)
CA (1) CA2074787C (fr)
DE (1) DE4125062C2 (fr)
ES (1) ES2078601T3 (fr)
FI (1) FI106643B (fr)

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DE4401220C1 (de) * 1994-01-18 1995-06-29 Voith Gmbh J M Dampfblaskasten
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FI107065B (fi) * 1999-10-21 2001-05-31 Metso Paper Automation Oy Paperikoneen höyrylaatikko
US6732452B2 (en) 2001-12-21 2004-05-11 Kimberly-Clark Worldwide, Inc. Apparatus and process for throughair drying of a paper web
DE10343949A1 (de) * 2003-09-23 2005-04-28 Voith Paper Patent Gmbh Einrichtung zur berührungslosen Führung und/oder Trocknung einer laufenden Papier-, Karton- oder anderen Warenbahn
US6910283B1 (en) * 2003-12-19 2005-06-28 Kimberly-Clark Worldwide, Inc. Method and system for heat recovery in a throughdrying tissue making process
US8061055B2 (en) * 2007-05-07 2011-11-22 Megtec Systems, Inc. Step air foil web stabilizer
DE102010041762A1 (de) 2010-09-30 2012-04-05 Voith Patent Gmbh Vorrichtung zum Befeuchten der Oberflächenschicht einer Faserstoffbahn

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Also Published As

Publication number Publication date
DE4125062A1 (de) 1993-02-04
EP0528160A1 (fr) 1993-02-24
US5282323A (en) 1994-02-01
CA2074787A1 (fr) 1993-01-30
FI923390A7 (fi) 1993-01-30
ES2078601T3 (es) 1995-12-16
ATE129036T1 (de) 1995-10-15
CA2074787C (fr) 1996-08-06
JPH06299492A (ja) 1994-10-25
FI923390A0 (fi) 1992-07-27
FI106643B (fi) 2001-03-15
JPH0816318B2 (ja) 1996-02-21
DE4125062C2 (de) 1994-12-08

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