EP0275914A2 - Apparatus for supplying vapour to a web such as a paper web - Google Patents

Apparatus for supplying vapour to a web such as a paper web Download PDF

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Publication number
EP0275914A2
EP0275914A2 EP88100379A EP88100379A EP0275914A2 EP 0275914 A2 EP0275914 A2 EP 0275914A2 EP 88100379 A EP88100379 A EP 88100379A EP 88100379 A EP88100379 A EP 88100379A EP 0275914 A2 EP0275914 A2 EP 0275914A2
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EP
European Patent Office
Prior art keywords
zone
steam
main
exit
work surface
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Granted
Application number
EP88100379A
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German (de)
French (fr)
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EP0275914A3 (en
EP0275914B1 (en
Inventor
Stefan H. Winheim
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VIB Apparatebau GmbH
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VIB Apparatebau GmbH
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Priority to AT88100379T priority Critical patent/ATE92556T1/en
Publication of EP0275914A2 publication Critical patent/EP0275914A2/en
Publication of EP0275914A3 publication Critical patent/EP0275914A3/en
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Publication of EP0275914B1 publication Critical patent/EP0275914B1/en
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    • 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
    • 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

Definitions

  • the invention relates to a device for applying steam to a material web, such as paper, with a steam blow box, which has blow openings for the steam outlet in a housing wall delimiting an evaporation space, the blow openings being provided in a main zone and an input zone and an output zone.
  • Such a device is known from US-PS 43 51 700.
  • the temperature of the material web is increased by the steam condensing on the material web. This leads to better dewatering in papermaking, so that less water has to be evaporated in the drying section.
  • a specific moisture profile can be achieved by changing the vapor applied across the web width.
  • the steam blow box is arranged in the area of the gap between two co-operating rollers.
  • the housing wall having the blowing openings has a curvature corresponding to the roller serving as the transport device.
  • the steam jets emerging through the blow openings are directed approximately perpendicularly onto the cylindrical work surface.
  • the steam jets occur in the entrance zone with higher pressure. Its task is to form a steam curtain that reduces the amount of air drawn in with the material web. In this way, the efficiency should be improved.
  • the housing wall is curved away from the work surface, so that the steam jets emerge there approximately parallel to the work surface.
  • the invention has for its object to provide a device of the type described above, in which the efficiency is increased by better utilization of the steam.
  • This object is achieved in that the outlet direction of the blowing openings in the exit zone is inclined more towards the main zone than in the entrance zone.
  • the exit direction of the blowing openings in the exit zone is preferably inclined more towards the main zone than in the entrance zone. This takes into account the fact that the steam wants to exit on the input side against the direction of movement of the paper web, but is entrained on the output side by the paper web.
  • the exit direction of the blowing openings of the exit zone deviates by approximately 20 ° to 27 °, preferably approximately 22 °, from the normal to the work surface formed by the material web.
  • the exit direction of the blast openings of the entry zone should be 15 ° to 21 0, preferably 18 °, from the perpendicular to the work surface. differ.
  • blow openings of the entrance, main and exit zones each have an entrance, main or. Exit distribution space and that the output distribution space is connected to the steam supply line, that a front steam distribution duct runs between the main distribution space and the input distribution space and a rear steam distribution duct runs between the main distribution space and the output distribution space that the front steam distribution duct runs a widthwise number of holes is connected to the input distribution space and the rear steam distribution duct is connected to the output distribution space via a widthwise number of holes, and that the main distribution space is divided into a number of chambers each are connected to one of the steam distribution channels via a valve.
  • the two steam channels ensure a uniform distribution of the steam in the inlet and outlet distribution space as well as a uniform supply of the steam to the valves of the chambers of the main distribution space. It also ensures that the steam jets in the input or. Exit zone are blown out at a higher speed and pressure than in the main zone. This supports the Sperrwir kung.
  • the number and / or the cross section of the holes leading to the input distribution space should be smaller than for the holes leading to the output distribution space.
  • the exit speed in the exit zone is therefore greater than in the entrance zone, which further improves the barrier effect.
  • the steam distribution Anaele k is connected in series and are interconnected via a restrictor-adjusting means.
  • the steam pressure in the two steam distribution channels can be set differently.
  • the pressure in the inlet manifold and in the outlet manifold can be selected so that there is an optimal blocking effect.
  • the front steam distribution duct is connected to the steam supply line at one end, both steam distribution ducts are connected to one another at the other end, and the chambers of the main distribution space are connected to the front steam distribution duct. This gives a short path for the steam to be fed to the main zone.
  • the barrier effect is increased in that the entrance zone at the beginning and the exit zone at the end are each delimited by a wall element which extends in the width direction and is at a smaller distance from the work surface in the exit zone than in the entrance zone.
  • the smaller distance on the output side results in a higher throttle resistance and thus the desired higher blocking effect.
  • the greater distance on the input side prevents the wide slot formed in this way from being clogged by particles of material which may be entrained by the material web. This ensures that air can always enter the steaming chamber and that no vacuum generated by an associated suction device can press the steam blower box onto the web and thereby destroy it.
  • the entrance zone at the beginning and the exit zone at the end are each delimited by a wall element which extends in the width direction and is provided with a heating device.
  • the heating device ensures that at the ends of the steam blow box, which are cooled by the colder ambient air, there are no drip points where condensate drops falling onto the material web can impair the uniform temperature and humidity values.
  • the wall element can be a tube that can be heated in its interior by steam condensation.
  • a heater can be easily connected to the existing steam rooms.
  • the housing wall in the main zone runs parallel to the work surface and in the input and output zones at mutually opposite angles to the work surface, and that the blow openings are formed by holes penetrating the housing wall perpendicularly. In this way, the desired inclination of the outlet direction of the blow openings is obtained with simple means.
  • a material web 1 made of paper is moved with the horizontal upper working surface 3 in the direction of the arrows 4.
  • the material web 1 can be supported on the top of the wire section of a vacuum suction device of a paper machine or in some other way.
  • An evaporation chamber 5 with a main zone 6, an entrance zone 7 and an exit zone 8 is located above the material web 1.
  • the steam jets 14 and 16 are inclined towards the main zone 6. They deviate from the vertical to the work surface 3 in the input zone 7 by approximately 18 ° and in the output zone 8 by approximately 24 °.
  • blow openings 11, 13 and 15 extend in two or more rows each across the entire width of the steam blow box 9.
  • the blow openings 13 and 15 result on the inlet and outlet sides of vapor barriers, which prevent to a substantial extent that steam from the steaming chamber 5 at the point of introduction and in particular occurs at the point of execution of the material web.
  • an extraordinarily large amount of steam can give off heat to the material web 1 by condensation.
  • the outlet plenum 22 is connected to the rear vapor distribution duct 21 through a number of larger-diameter holes 26 distributed across the width.
  • the inlet manifold 18 is connected to the front vapor distribution duct 19 through a number of holes 27 smaller average distributed in the width direction.
  • the main distribution space 20 is divided into a plurality of chambers 28 which are separated from one another by walls 29 running in the longitudinal direction, that is to say are arranged next to one another in the width direction.
  • Each chamber 28 is supplied with steam from the front steam distribution channel 19 via a pipe 30 and a valve 31.
  • the valve control takes place via an actuator 32, for example a pneumatic actuator.
  • a wall element 33 At the beginning of the entrance zone 7 there is a wall element 33 and at the end of the exit zone 8 there is a wall element 34.
  • the latter has a smaller distance from the work surface 3 than the wall element on the entrance side.
  • Both wall elements are designed as a tube with a rectangular cross-section. They are connected at one end to a line 35 or 36, which leads from the front or rear steam distribution channel 19, 21. As a result, these wall elements are heated by condensation in such a way that water particles located on the outside can evaporate, ie they cannot have a detrimental effect on the material web 1.
  • Drainage openings are provided wherever condensation could take place, for example openings 37 to 43, possibly with associated drainage channels.
  • the housing wall 10 has a central horizontal section 44, an inclined, flat section 45 on the inlet side and an oppositely inclined, flat section 46 on the outlet side, the blow openings 11, 13 and 15 being formed by bores penetrating the housing wall perpendicularly.
  • the individual housing wall sections 44, 45 and 46 can have a corresponding curvature, but should retain their inclination assignment. Instead, it is also possible to insert nozzles in the housing wall, which have the desired direction, or to provide inclined bores.
  • the steam blower box can also be used - in the opposite position - for steam application from below. Then the drainage channel with the opening 40 in the main zone is omitted. And the drainage openings 37 to 43 are moved to the then lower position.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The device possesses a steam distributor (9). Vents (11, 13 and 15) for the discharge of the steam are provided in a housing wall (10) delimiting a steaming space (5). The exit directions of the vents (13) in an entry zone (7) and/or of the vents (15) in an exit zone (8) are inclined towards a main zone (6) lying between them. This results in a barrier considerably reducing the escape of steam from the steaming space. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Aufbringen von Dampf auf eine Materialbahn, wie Papier, mit einem Dampfblaskasten, der in einer einen Bedampfungsraum begrenzenden Gehäusewand Blasöffnungen für den Dampfaustritt aufweist, wobei die Blasöffnungen in einer Hauptzone sowie einer Eingangszone und einer Ausgangszone vorgesehen sind.The invention relates to a device for applying steam to a material web, such as paper, with a steam blow box, which has blow openings for the steam outlet in a housing wall delimiting an evaporation space, the blow openings being provided in a main zone and an input zone and an output zone.

Eine solche Vorrichtung ist aus US-PS 43 51 700 bekannt. Durch den auf der Materialbahn kondensierenden Dampf wird die Temperatur der Materialbahn erhöht. Dies führt bei der Papierherstellung zu einer besseren Entwässerung, so daß beim Trockungsabschnitt weniger Wasser verdampft werden muß. Außerdem kann durch Änderung des aufgebrachten Dampfes quer über die Bahnbreite ein bestimmtes Feuchtigkeitsprofil erzielt werden.Such a device is known from US-PS 43 51 700. The temperature of the material web is increased by the steam condensing on the material web. This leads to better dewatering in papermaking, so that less water has to be evaporated in the drying section. In addition, a specific moisture profile can be achieved by changing the vapor applied across the web width.

Bei der bekannten Konstruktion wird der Dampfblaskasten im Bereich des Spalts zweier zusammenwirkender Walzen angeordnet. Die die Blasöffungen aufweisende Gehäusewand hat eine der als Transportvorrichtung dienenden Walze entsprechende Krümmung. Sowohl in der Eingangszone als auch in der Hauptzone werden die durch die Blasöffnungen austretenden Dampfstrahlen etwa senkrecht auf die zylindrische Arbeitsfläche gerichtet. Hierbei treten die Dampfstrahlen in der Eingangszone mit höherem Druck auf. Sie habe die Aufgabe, einen Dampfvorhang zu bilden, der die Menge der mit der Materialbahn eingezogenen Luft vermindert. Auf diese Weise soll der Wirkungsgrad verbessert werden. In der Ausgangszone ist die Gehäusewand von der Arbeitsfläche weg gekrümmt, so daß dort die Dampfstrahlen etwa parallel zur Arbeitsfläche austreten.In the known construction, the steam blow box is arranged in the area of the gap between two co-operating rollers. The housing wall having the blowing openings has a curvature corresponding to the roller serving as the transport device. Both in the entrance zone and in the main zone, the steam jets emerging through the blow openings are directed approximately perpendicularly onto the cylindrical work surface. Here the steam jets occur in the entrance zone with higher pressure. Its task is to form a steam curtain that reduces the amount of air drawn in with the material web. In this way, the efficiency should be improved. In the exit zone, the housing wall is curved away from the work surface, so that the steam jets emerge there approximately parallel to the work surface.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs beschriebenen Art anzugeben, bei der durch bessere Ausnutzung des Dampfes der Wirkungsgrad erhöht wird.The invention has for its object to provide a device of the type described above, in which the efficiency is increased by better utilization of the steam.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Austrittsrichtung der Blasöffnungen in der Ausgangszone stärker zur Hauptzone hin geneigt ist als in der Eingangszone.This object is achieved in that the outlet direction of the blowing openings in the exit zone is inclined more towards the main zone than in the entrance zone.

Mit Hilfe dieser Blasöffnungen werden Dampfstrahlen erzeugt, die eine Komponente in Richtung auf die Hauptzone haben. Dies ergibt eine sehr wirksame Dampfsperre, die verhindert, daß in der Hauptzone zugeführter Dampf am jeweiligen Ende aus dem Bedampfungsraum nach außen tritt. Dies gilt insbesondere für die Austrittsseite eines Dampfblaskastens, unter dem die Materialbahn längs einer ebenen Arbeitsfläche hindurchläuft. Durch diese Dampfsperre ist es möglich, in der Hauptzone durch Wahl einer höheren Ausblasgeschwindigkeit mehr Dampf auf die Bahn zu blasen als bisher, ohne daß große Leckdampfmengen auf dem Dampfkasten austreten. Dies ergibt eine Steigerung der der Wärmeübertragung dienenden Dampfmenge. Außerdem kann der zugeführte Dampf in sehr viel höherem Maße als bisher ausgenutzt werden. Ferner wird die Feuchtigkeit in dem den Dämpfblaskasten aufnehmenden Arbeitsraum reduziert, da der Dampf nicht wie bisher in erheblichem Maß an der Eingangs-und Ausgangsseite des Dampfkastens austritt und das Raumklima verschlechtert.With the help of these blowing openings, steam jets are generated which have a component in the direction of the main zone. This results in a very effective vapor barrier, which prevents steam supplied in the main zone from escaping from the vaporization space at the respective end. This applies in particular to the outlet side of a steam blow box, under which the material web runs along a flat work surface. This vapor barrier makes it possible to blow more steam onto the web than previously in the main zone by choosing a higher blow-out speed, without large amounts of leaked steam escaping from the steam box. This results in an increase in the amount of steam used for heat transfer. In addition, the steam supplied can be used to a much greater extent than before. Furthermore, the moisture in the work space accommodating the steam blower box is reduced, since the steam does not escape to a considerable extent at the inlet and outlet sides of the steam box as before and worsens the room climate.

Vorzugsweise ist die Austrittsrichtung der Blasöffnungen in der Ausgangszone stärker zur Hauptzone hin geneigt als in der Eingangszone. Dadurch wird der Tatsache Rechnung getragen, daß der Dampf eingangsseitig entgegen der Bewegungsrichtung der Papierbahn austreten möchte, ausgangsseitig aber von der Papierbahn mitgerissen wird.The exit direction of the blowing openings in the exit zone is preferably inclined more towards the main zone than in the entrance zone. This takes into account the fact that the steam wants to exit on the input side against the direction of movement of the paper web, but is entrained on the output side by the paper web.

Als zweckmäßig hat es sich erwiesen, daß die Austrittsrichtung der Blasöffnungen der Ausgangszone etwa 20° bis 27°, vorzugsweise etwa 22°, von der Senkrechten auf die durch die Materialbahn gebildete Arbeitsfläche abweicht. Und die Austrittsrichtung der Blasöffnungen der Eingangszone sollte 15° bis 21 0, vorzugsweise 18°, von der Senkrechten auf die Arbeitsfläche. abweichen.It has proven to be expedient that the exit direction of the blowing openings of the exit zone deviates by approximately 20 ° to 27 °, preferably approximately 22 °, from the normal to the work surface formed by the material web. And the exit direction of the blast openings of the entry zone should be 15 ° to 21 0, preferably 18 °, from the perpendicular to the work surface. differ.

Konstruktiv empfiehlt es sich, daß die Blasöffnungen der Eingangs-, Haupt-und Ausgangszone je von einem Eingangs-, Haupt-bzw. Ausgangs-Verteilerraum ausgehen und daß der Ausgangs-Verteilerraum mit der Dampfzuleitung verbunden ist, daß zwischen dem Haupt-Verteilerraum und dem Eingangs-Verteilerraum ein vorderer Dampfverteilkanal und zwischen dem Haupt-Verteilerraum und dem Ausgangs-Verteilerraum ein hinterer Dampfverteilkanal verläuft, daß der vordere Dampfverteilkanal über eine in Breitenrichtung verteilte Anzahl von Löchern mit dem Eingangs-Verteilerraum und der hintere Dampfverteil kanal über eine in Breitenrichtung verteilte Anzahl von Löchern mit dem Ausgangs-Verteilerraum verbunden ist, und daß der Haupt-Verteilerraum in eine Anzahl von Kammern unterteilt ist, die je über ein Ventil mit einem der Dampfverteilkanäle verbunden sind. Die beiden Dampfkanäle sorgen für eine gleichmäßige Verteilung des Dampfes in dem Eingangs-und dem Ausgangs-Verteilerraum sowie für eine gleichmäßige Zufuhr des Dampfes zu den Ventilen der Kammern des Haupt-Verteilerraums. Außerdem ist sichergestellt, daß die Dampfstrahlen in der Eingangs-bzw. Ausgangszone mit höherer Geschwindigkeit und Druck ausgeblasen werden als in der Hauptzone. Dies unterstützt die Sperrwirkung.It is structurally recommended that the blow openings of the entrance, main and exit zones each have an entrance, main or. Exit distribution space and that the output distribution space is connected to the steam supply line, that a front steam distribution duct runs between the main distribution space and the input distribution space and a rear steam distribution duct runs between the main distribution space and the output distribution space that the front steam distribution duct runs a widthwise number of holes is connected to the input distribution space and the rear steam distribution duct is connected to the output distribution space via a widthwise number of holes, and that the main distribution space is divided into a number of chambers each are connected to one of the steam distribution channels via a valve. The two steam channels ensure a uniform distribution of the steam in the inlet and outlet distribution space as well as a uniform supply of the steam to the valves of the chambers of the main distribution space. It also ensures that the steam jets in the input or. Exit zone are blown out at a higher speed and pressure than in the main zone. This supports the Sperrwir kung.

Hierbei sollte die Anzahl und/oder der Querschnitt der zum Eingangs-Verteilerraum führenden Löcher kleiner als bei den zum Ausgangs-Verteilerraum führenden Löchern sein. Die Austrittsgeschwindigkeit in der Ausgangszone ist damit größer als in der Eingangszone, was die Sperrwirkung noch verbessert.Here, the number and / or the cross section of the holes leading to the input distribution space should be smaller than for the holes leading to the output distribution space. The exit speed in the exit zone is therefore greater than in the entrance zone, which further improves the barrier effect.

Günstig ist es, daß die Dampfverteilkanäle in Reihe geschaltet und über ein Drossel-Einstellorgan miteinander verbunden sind. Auf diese Weise läßt sich der Dampfdruck in den beiden Dampfverteilkanälen unterschiedlich einstellen. Insbesondere kann der Druck im Eingangs-Verteilerraum und im Ausgangs-Verteilerraum so gewählt werden, daß sich eine optimale Sperrwirkung ergibt.It is favorable that the steam distribution Anaele k is connected in series and are interconnected via a restrictor-adjusting means. In this way, the steam pressure in the two steam distribution channels can be set differently. In particular, the pressure in the inlet manifold and in the outlet manifold can be selected so that there is an optimal blocking effect.

Vorteilhaft ist es auch, daß der vordere Dampfverteilkanal an einem Ende mit der Dampfzuleitung, beide Dampfverteilkanäle am anderen Ende miteinander und die Kammern des Haupt-Verteilerraums mit dem vorderen Dampfverteilkanal verbunden sind. Dies ergibt einen kurzen Weg für den der Hauptzone zuzuführenden Dampf.It is also advantageous that the front steam distribution duct is connected to the steam supply line at one end, both steam distribution ducts are connected to one another at the other end, and the chambers of the main distribution space are connected to the front steam distribution duct. This gives a short path for the steam to be fed to the main zone.

Die Sperrwirkung wird dadurch erhöht, daß die Eingangszone am Anfang und die Ausgangszone am Ende je durch ein sich in Breitenrichtung erstreckendes Wandelement begrenzt ist, das in der Ausgangszone einen kleineren Abstand von der Arbeitsfläche hat als in der Eingangszone. Der kleinere Abstand an der Ausgangsseite ergibt einen höheren Drosselwiderstand und damit die erstrebte höhere Sperrwirkung. Der größere Abstand an der Eingangsseite verhindert, daß sich der so gebildete Breitschlitzdurch eventuell von der Materialbahn mitgerissene Stoffpartikel zusetzen kann. Damit ist sichergestellt, daß immer Luft in den Bedampfungsraum eintreten kann und kein von einem zugehörigen Sauger erzeugter Unterdruck den Dampfblaskasten auf die Bahn pressen und diese dadurch zerstören kann.The barrier effect is increased in that the entrance zone at the beginning and the exit zone at the end are each delimited by a wall element which extends in the width direction and is at a smaller distance from the work surface in the exit zone than in the entrance zone. The smaller distance on the output side results in a higher throttle resistance and thus the desired higher blocking effect. The greater distance on the input side prevents the wide slot formed in this way from being clogged by particles of material which may be entrained by the material web. This ensures that air can always enter the steaming chamber and that no vacuum generated by an associated suction device can press the steam blower box onto the web and thereby destroy it.

Besonders vorteilhaft ist es, daß die Eingangszone am Anfang und die Ausgangszone am Ende je durch ein sich in Breitenrichtung erstreckendes Wandelement begrenzt ist, das mit einer Heizvorrichtung versehen ist. Die Heizvorrichtung stellt sicher, daß an den Enden des Dampfblaskastens, die durch die kältere Umgebungsluft gekühlt werden, keine Tropfstellen entstehen, wo Kondensattropfen auf die Materialbahn fallen die gleichmäßigen Temperatur-und Feuchtigkeitswerte beeinträchtigen können.It is particularly advantageous that the entrance zone at the beginning and the exit zone at the end are each delimited by a wall element which extends in the width direction and is provided with a heating device. The heating device ensures that at the ends of the steam blow box, which are cooled by the colder ambient air, there are no drip points where condensate drops falling onto the material web can impair the uniform temperature and humidity values.

Insbesondere kann das Wandelement ein durch Dampfkondensation in seinem Inneren beheizbares Rohr sein. Eine solche Heizung läßt sich einfach an die bereits vorhandenen Dampfräume anschließen.In particular, the wall element can be a tube that can be heated in its interior by steam condensation. Such a heater can be easily connected to the existing steam rooms.

Bei einem Ausführungsbeispiel hat es sich als günstig herausgestellt, daß bei einer ebenen Arbeitsfläche die Gehäusewand in der Hauptzone parallel zur Arbeitsfläche und in der Eingangs-und Ausgangszone in einander entgegengesetzten Winkeln zur Arbeitsfläche verläuft und daß die Blasöffnungen durch die Gehäusewand senkrecht durchsetzende Bohrungen gebildet sind. Auf diese Weise erhält man mit einfachen Mitteln die gewünschte Neigung der Austrittsrichtung der Blasöffnungen.In one embodiment, it has been found to be advantageous that, in the case of a flat work surface, the housing wall in the main zone runs parallel to the work surface and in the input and output zones at mutually opposite angles to the work surface, and that the blow openings are formed by holes penetrating the housing wall perpendicularly. In this way, the desired inclination of the outlet direction of the blow openings is obtained with simple means.

Die Erfindung wird nachstehend anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

  • Fig. 1 einen Längsschnitt durch die erfindungsgemäße Vorrichtung der Linie G-H der Fig. 3,
  • Fig. 2 einen Teilquerschnitt längs der Linie A-8 in Fig. 1,
  • Fig. 3 einen Teilquerschnitt längs der Linie C-D in Fig. 1 und
  • Fig. 4 einen Teilquerschnitt längs der Linie E-F in Fig. 1.
The invention is explained below with reference to a preferred embodiment shown in the drawing. Show it:
  • 1 shows a longitudinal section through the device according to the invention on the line GH of FIG. 3,
  • FIG. 2 shows a partial cross section along the line A-8 in FIG. 1,
  • Fig. 3 is a partial cross section along the line CD in Fig. 1 and
  • 4 shows a partial cross section along the line EF in FIG. 1.

Eine Materialbahn 1 aus Papier wird mit horizontaler oberer Arbeitsfläche 3 in Richtung der Pfeile 4 bewegt. Die Materialbahn 1 kann hierbei auf der Oberseite der Siebpartie eines Vakuumsaugers einer Papiermaschine oder auf andere Weise abgestützt sein. Über der Materialbahn 1 befindet sich ein Bedampfungsraum 5 mit einer Hauptzone 6, einer Eingangszone 7 und einer Ausgangszone 8.A material web 1 made of paper is moved with the horizontal upper working surface 3 in the direction of the arrows 4. The material web 1 can be supported on the top of the wire section of a vacuum suction device of a paper machine or in some other way. An evaporation chamber 5 with a main zone 6, an entrance zone 7 and an exit zone 8 is located above the material web 1.

Ein Dampfblaskasten 9, der auf einen solchen Sauger aufgesetzt ist, besitzt eine untere Gehäusewand 10, die in der Hauptzone 6 Blasöffnungen 11 zur Abgabe von etwa senkrecht auf die Arbeitsfläche 3 auftretenden Dampfstrahlen 12, in der Eingangszone 7 Blasöffnungen 13 zur Abgabe von Dampfstrahlen 14 und in der Ausgangszone 8 Öffnungen 15 zur Abgabe von Dampfstrahlen 16 aufweist. Die Dampfstrahlen 14 und 16 sind zur Hauptzone 6 hin geneigt. Sie weichen in der Eingangszone 7 um etwa 18° und in der Ausgangszone 8 um etwa 24° von der Senkrechten auf die Arbeitsfläche 3 ab.A steam blower box 9, which is placed on such a suction device, has a lower housing wall 10, the blow openings 11 in the main zone 6 for the discharge of approximately perpendicular to the work surface 3 steam jets 12, in the entrance zone 7 blow openings 13 for the discharge of steam jets 14 and in the exit zone 8 has openings 15 for discharging steam jets 16. The steam jets 14 and 16 are inclined towards the main zone 6. They deviate from the vertical to the work surface 3 in the input zone 7 by approximately 18 ° and in the output zone 8 by approximately 24 °.

Die Blasöffnungen 11, 13 und 15 erstrecken sich in zwei oder mehr Reihen jeweils über die gesamte Breite des Dampfblaskastens 9. Die Blasöffnungen 13 und 15 ergeben eingangsseitig und ausgangsseitig Dampfsperren, die zu einem wesentlichen Maß verhindern, daß Dampf aus dem Bedampfungsraum 5 an der Einführungsstelle und insbesondere an der Ausführungsstelle der Materialbahn nach außen tritt. Demzufolge kann eine außerordentlich große Dampfmenge Wärme durch Kondensation an die Materialbahn 1 abgeben.The blow openings 11, 13 and 15 extend in two or more rows each across the entire width of the steam blow box 9. The blow openings 13 and 15 result on the inlet and outlet sides of vapor barriers, which prevent to a substantial extent that steam from the steaming chamber 5 at the point of introduction and in particular occurs at the point of execution of the material web. As a result, an extraordinarily large amount of steam can give off heat to the material web 1 by condensation.

Im Innern des mit einer Wärmeisolationsschicht 17 versehenen Dampfblaskastens 9 sind in Längsrichtung hintereinander ein Eingangsverteilerraum 18, von dem die Blasöffnungen 13 abgehen, ein vorderer Dampfverteilkanal 19, ein Haupt-Verteilerraum 20, von dem die Blasöffnungen 11 abgehen, ein hinterer Dampfverteilkanal 21 und ein Ausgangs-Verteilerraum 22, von dem die Blasöffnungen 15 abgehen, angeordnet. Dem vorderen Dampfverteilkanal 21 wird Dampf über eine Dampfzuleitung 23 an einem Ende zugeführt. Am andere Ende gibt es ein Verbindungsrohr 24, das zum hinteren Dampfverteilkanal 19 führt, wie dies in Fig. 5 eingezeichnet ist. In dieser Leitung befindet sich ein Drossel-Einstellorgan 25, mit dessen Hilfe das Druckniveau in den Dampfverteilkanälen 19 und 21 unterschiedlich gehalten werden kann. Der Ausgangs-Verteilerraum 22 ist über eine in Breitenrichtung verteilte Anzahl von Löchern 26 größeren Durchschnitts mit dem hinteren Dampfverteilkanal 21 verbunden. Der Eingangs-Verteilerraum 18 ist über eine in Breitenrichtung verteilte Anzahl von Löchern 27 kleineren Durchschnitts mit dem vorderen Dampfverteilkanal 19 verbunden.Inside the steam blower box 9, which is provided with a heat insulation layer 17, in the longitudinal direction, one behind the other, is an inlet distributor space 18, from which the blower openings 13 extend, a front steam distribution duct 19, a main Ver divider chamber 20, from which the blower openings 11 depart, a rear steam distribution channel 21 and an outlet distributor chamber 22, from which the blower openings 15 depart. Steam is supplied to the front steam distribution channel 21 via a steam feed line 23 at one end. At the other end there is a connecting pipe 24 which leads to the rear steam distribution duct 19, as shown in FIG. 5. In this line there is a throttle setting element 25, with the aid of which the pressure level in the steam distribution channels 19 and 21 can be kept different. The outlet plenum 22 is connected to the rear vapor distribution duct 21 through a number of larger-diameter holes 26 distributed across the width. The inlet manifold 18 is connected to the front vapor distribution duct 19 through a number of holes 27 smaller average distributed in the width direction.

Der Haupt-Verteilerraum 20 ist in eine Vielzahl von Kammern 28 unterteilt, die durch in Längsrichtung verlaufende Wände 29 voneinander getrennt, also in Breitenrichtung nebeneinander angeordnet sind. Jede Kammer 28 wird vom vorderen Dampfverteilkanal 19 über ein Rohr 30 und ein Ventil 31 mit Dampf versorgt. Die Ventilsteuerung erfolgt über ein Stellglied 32, beispielsweise ein pneumatisches Stellglied.The main distribution space 20 is divided into a plurality of chambers 28 which are separated from one another by walls 29 running in the longitudinal direction, that is to say are arranged next to one another in the width direction. Each chamber 28 is supplied with steam from the front steam distribution channel 19 via a pipe 30 and a valve 31. The valve control takes place via an actuator 32, for example a pneumatic actuator.

Am Anfang der Eingangszone 7 gibt es ein Wandelement 33 und am Ende der Ausgangszone 8 ein Wandelement 34. Letzteres hat einen geringeren Abstand von der Arbeitsfläche 3 als das eingangsseitige Wandelement. Beide Wandelemente sind als Rohr mit Rechteckquerschnitt ausgeführt. Sie stehen an einem Ende mit einer Leitung 35 bzw. 36 in Verbindung, die vom vorderen bzw. hinteren Dampfverteilkanal 19, 21 abgeht. Infolgedessen erfolgt eine Beheizung dieser Wandelemente durch Kondensation derart, daß an der Außenseite befindliche Wasserteilchen verdampfen können, also die Materialbahn 1 nicht schädlich beeinflüssen können.At the beginning of the entrance zone 7 there is a wall element 33 and at the end of the exit zone 8 there is a wall element 34. The latter has a smaller distance from the work surface 3 than the wall element on the entrance side. Both wall elements are designed as a tube with a rectangular cross-section. They are connected at one end to a line 35 or 36, which leads from the front or rear steam distribution channel 19, 21. As a result, these wall elements are heated by condensation in such a way that water particles located on the outside can evaporate, ie they cannot have a detrimental effect on the material web 1.

Überall dort, wo eine Kondensation stattfinden könnte, sind Ablauföffnungen vorgesehen, beispielsweise die Öffnungen 37 bis 43, gegebenenfalls mit zugehörigen Entwässerungsrinnen.Drainage openings are provided wherever condensation could take place, for example openings 37 to 43, possibly with associated drainage channels.

Im dargestellten Ausführungsbeispiel hat die Gehäusewand 10 einen mittleren horizontalen Abschnitt 44, eingangsseitig einen geneigten, ebenen Abschnitt 45 und ausgangsseitig einen entgegengesetzt geneigten, ebenen Abschnitt 46, wobei die Blasöffnungen 11, 13 und 15 durch die Gehäusewand senkrecht durchsetzende Bohrungen gebildet sind. Wenn demgegenüber die Materialbahn 1 auf einer gekrümmten Fläche transportiert wird, können die einzelnen Gehäusewandabschnitte 44, 45 und 46 eine entsprechende Krümmung haben, sollten aber ihre Neigungszuordnung behalten. Stattdessen ist es auch möglich, in die Gehäusewand Düsen einzusetzen, die die gewünschte Richtung haben, oder Schrägbohrungen vorzusehen.In the exemplary embodiment shown, the housing wall 10 has a central horizontal section 44, an inclined, flat section 45 on the inlet side and an oppositely inclined, flat section 46 on the outlet side, the blow openings 11, 13 and 15 being formed by bores penetrating the housing wall perpendicularly. In contrast, if the material web 1 is transported on a curved surface, the individual housing wall sections 44, 45 and 46 can have a corresponding curvature, but should retain their inclination assignment. Instead, it is also possible to insert nozzles in the housing wall, which have the desired direction, or to provide inclined bores.

Der Dampfblaskasten kann auch - in umgekehrter Lage -für die Dampfaufbringung von unten eingesetzt werden. Dann entfällt die Entwässerungsrinne mit der Öffnung 40 in der Hauptzone. Und die Entwässerungsöffnungen 37 bis 43 werden in die dann untere Position verlegt.The steam blower box can also be used - in the opposite position - for steam application from below. Then the drainage channel with the opening 40 in the main zone is omitted. And the drainage openings 37 to 43 are moved to the then lower position.

Claims (12)

Vorrichtung zum Aufbringen von Dampf auf eine Materialbahn, wie Papier, mit einem Dampfblaskasten, der in einer einen Bedampfungsraum begrenzenden Gehäusewand Blasöffnungen für den Dampfaustritt aufweist, wobei die Blasöffnungen in einer Hauptzone sowie einer Eingangzone und einer Ausgangszone vorgesehen sind, dadurch gekennzeichnet, daß die Austrittsrichtung der Blasöffnungen (13, 15) in der Eingangszone (7) und/oder Ausgangszone (8) zur Hauptzone hin geneigt ist.Apparatus for applying steam to a material web, such as paper, with a steam blower box which has blow openings for the steam outlet in a housing wall delimiting an evaporation chamber, the blow openings being provided in a main zone as well as an inlet zone and an outlet zone, characterized in that the outlet direction the blowing openings (13, 15) in the entrance zone (7) and / or exit zone (8) is inclined towards the main zone. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Austrittsrichtung der Blasöffnungen (15) in der Ausgangszone (8) stärker zur Hauptzone hin geneigt ist als in der Eingangszone (7).2. Device according to claim 1, characterized in that the outlet direction of the blowing openings (15) in the exit zone (8) is more inclined towards the main zone than in the entrance zone (7). 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Austrittsrichtung der Blasöffnunnungen (15) der Ausgangszone (8) 20° bis 27° von der Senkrechten auf die durch die Materialbahn (1) gebildete Arbeitsfläche (3) abweicht.3. Apparatus according to claim 1 or 2, characterized in that the outlet direction of the blow openings (15) of the exit zone (8) deviates 20 ° to 27 ° from the vertical to the work surface (3) formed by the material web (1). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Austrittsrichtung der Blasöffnungen (13) der Eingangszone (7) 15° bis 21 ° von der Senkrechten auf die durch die Materialbahn (1) gebildete Arbeitsfläche (3) abweicht.4. Device according to one of claims 1 to 3, characterized in that the outlet direction of the blowing openings (13) of the input zone (7) deviates 15 ° to 21 ° from the vertical to the work surface (3) formed by the material web (1). 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Blasöffungen (11, 13, 15) der Eingangs-, Haupt-und Ausgangszone je von einem Eingangs-, Haupt-bzw. Ausgangs-Verteilerraum (18, 20, 22) ausgehen, daß zwischen dem Haupt-Verteilerraum (20) und dem . Eingangs-Verteilerraum (18) ein vorderer Dampfverteilkanal (19) und zwischen dem Haupt-Verteilerraum und dem Ausgangs-Verteilerraum (22) ein hinterer Dampfverteilkanal (21) verläuft, daß der vordere Dampfverteilkanal über eine in Breitenrichtung verteilte Anzahl von Löchern (27) mit dem Eingangs-Vertelerraum und der hintere Dampfverteilkanal über eine in Breitenrichtung verteilte Anzahl von Löchern (26) mit dem Ausgangs-Verteilerraum verbunden ist, und daß der Haupt-Verteilerraum in eine Anzahl von Kammern (28) unterteilt ist, die je über ein Ventil (31) mit einem der Dampfverteilkanäle verbunden sind.5. Device according to one of claims 1 to 4, characterized in that the blowing openings (11, 13, 15) of the input, main and output zone each from an input, main or. Output manifold (18, 20, 22) that go out between the main manifold (20) and the. Input distribution space (18) a front steam distribution channel (19) and between the main distribution space and the output distribution space (22) a rear steam distribution channel (21) that the front steam distribution channel with a number of holes (27) distributed in the width direction the entrance distributor space and the rear steam distribution duct are connected to the exit distributor space via a number of holes (26) distributed in the width direction, and that the main distributor space is divided into a number of chambers (28), each of which is connected via a valve (31) to one of the steam distribution channels. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Anzahl und/oder der Querschnitt . der zum Eingangs-Verteilerraum (18) führenden Löcher (27) kleiner ist als bei den zum Ausgangs-Verteilerraum (22) führenden Löchern (26).6. The device according to claim 5, characterized in that the number and / or the cross section. the holes (27) leading to the inlet manifold (18) are smaller than the holes (26) leading to the outlet manifold (22). 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Dampfverteilkanäle (19, 21) in Reihe geschaltet und über ein Drossel-Einstellorgan (25) miteinander verbunden sind.7. The device according to claim 6, characterized in that the steam distribution channels (19, 21) are connected in series and are connected to one another via a throttle adjusting member (25). 8. Vorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß der vordere Dampfverteilkanal (19) an einem Ende mit der Dampfzuleitung (23), beide Dampfverteilkanäle (19, 21) am anderen Ende miteinander und die Kammern (28) des Haupt-Verteilerraums (20) mit dem vorderen Dampfverteilkanal (19) verbunden sind.8. Device according to one of claims 6 or 7, characterized in that the front steam distribution channel (19) at one end with the steam feed line (23), both steam distribution channels (19, 21) at the other end with each other and the chambers (28) of the main -Distribution space (20) are connected to the front steam distribution channel (19). 9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Eingangszone (7) am Anfang und die Ausgangszone (8) am Ende je durch ein sich in Breitenrichtung erstreckendes Wandelement (33, 34) begrenzt ist, das in der Ausgangszone einen kleineren Abstand von der Arbeitsfläche (3) hat als in der Eingangszone.9. Device according to one of claims 1 to 8, characterized in that the entrance zone (7) at the beginning and the exit zone (8) at the end is each limited by a wall element (33, 34) extending in the width direction, which is in the exit zone has a smaller distance from the work surface (3) than in the entrance zone. 10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Eingangszone (7) am Anfang und die Ausgangszone (8) am Ende je durch ein sich in Breitenrichtung erstreckendes Wandelement (33, 34) begrenzt ist, das mit einer Heizvorrichtung versehen ist.10. Device according to one of claims 1 to 9, characterized in that the input zone (7) at the beginning and the output zone (8) at the end is each limited by a wall element (33, 34) extending in the width direction, which with a heating device is provided. 11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß das Wandelement (33, 34) ein durch Dampfkondensation in seinem Inneren beheizbares Rohr ist.11. The device according to claim 10, characterized in that the wall element (33, 34) is a heatable by steam condensation in its interior tube. 12. Vorrichtung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß bei einer ebenen Arbeitsfläche (3) die Gehäusewand (10) in der Hauptzone (6) parallel zur Arbeitsfläche und in der Eingangsund Ausgangszone (7, 8) in einander entgegengesetzten Winkeln zur Arbeitsfläche verläuft und daß die Blasöffnungen (11, 13, 15) durch die Gehäusewand senkrecht durchsetzende Bohrungen gebildet isnd.12. The device according to one of claims 1 to 11, characterized in that with a flat work surface (3) the housing wall (10) in the main zone (6) parallel to the work surface and in the input and output zone (7, 8) at mutually opposite angles runs to the work surface and that the blowing openings (11, 13, 15) are formed by bores penetrating perpendicularly through the housing wall.
EP88100379A 1987-01-20 1988-01-13 Apparatus for supplying vapour to a web such as a paper web Expired - Lifetime EP0275914B1 (en)

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AT88100379T ATE92556T1 (en) 1987-01-20 1988-01-13 DEVICE FOR APPLYING STEAM TO A WEB OF MATERIAL SUCH AS PAPER.

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DE3701406 1987-01-20
DE19873701406 DE3701406A1 (en) 1987-01-20 1987-01-20 DEVICE FOR APPLYING STEAM TO A MATERIAL RAIL LIKE PAPER

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EP0275914A2 true EP0275914A2 (en) 1988-07-27
EP0275914A3 EP0275914A3 (en) 1991-04-17
EP0275914B1 EP0275914B1 (en) 1993-08-04

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EP (1) EP0275914B1 (en)
AT (1) ATE92556T1 (en)
CA (1) CA1296937C (en)
DE (1) DE3701406A1 (en)
ES (1) ES2042603T3 (en)

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Also Published As

Publication number Publication date
DE3701406A1 (en) 1988-07-28
EP0275914A3 (en) 1991-04-17
ES2042603T3 (en) 1993-12-16
CA1296937C (en) 1992-03-10
EP0275914B1 (en) 1993-08-04
ATE92556T1 (en) 1993-08-15
DE3701406C2 (en) 1988-10-27
US4915788A (en) 1990-04-10

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