EP0275915B1 - Steam distributor - Google Patents
Steam distributor Download PDFInfo
- Publication number
- EP0275915B1 EP0275915B1 EP88100380A EP88100380A EP0275915B1 EP 0275915 B1 EP0275915 B1 EP 0275915B1 EP 88100380 A EP88100380 A EP 88100380A EP 88100380 A EP88100380 A EP 88100380A EP 0275915 B1 EP0275915 B1 EP 0275915B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- distributor according
- steam distributor
- housing wall
- outlet apertures
- 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
Links
- 238000009826 distribution Methods 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 238000010025 steaming Methods 0.000 abstract description 3
- 238000009827 uniform distribution Methods 0.000 abstract description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- 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 material web, such as paper, with a main distribution space which extends across the width and which has a plurality of blowing openings which are offset in the transverse direction in a free housing wall and is divided by partition walls into adjacent chambers and for each chamber has a steam valve with a plurality of outlet openings opening into the part of the chamber facing away from the free housing wall, arranged on a circle around an axis approximately perpendicular to the free housing wall and having a center line at an angle to this axis.
- the main distribution room is delimited at the front and at the rear by a cylindrical steam supply duct.
- the free housing wall which is arranged at the bottom and is convexly curved towards the inside, there is a series of transversely offset blowing openings via which steam can flow into an evaporation space formed between the housing wall and the material web beneath it.
- the outlet is divided into a few outlet openings, which surround the valve seat, have a relatively large cross section and are directed essentially downwards.
- several rows of blowing openings are provided one behind the other in the longitudinal direction in the free housing wall of the main distribution space.
- a steam feed pipe passes through this main distribution room.
- the valve is connected to an area near the free housing wall via a vertically standing hollow cylinder.
- Such steam blow boxes are mainly used in papermaking.
- the increase in temperature that occurs as a result of steam condensation on the material web permits better dewatering, so that the subsequent drying process can be shortened.
- the steam supply can be controlled with the help of the valves so that a desired moisture profile across the width is achieved. Since the material web moves under the steam blower box at a considerable speed, the steaming process is only available for a short time. Irregularities in the steam distribution lead to considerable temperature differences and thus to different final moisture levels across the web.
- the invention has for its object to provide a steam blow box of the type described in the introduction, in which the distribution of the steam emerging from each chamber can be kept more uniform.
- This object is achieved in that the center lines of the outlet openings enclose an angle of at least 60 ° with the axis and that at least twelve outlet openings are provided.
- the emerging steam flows have a strong component perpendicular to the axis mentioned, that is, parallel to the free housing wall. It therefore takes some time for the steam to reach the blow holes. Since the steam is discharged through a larger number of outlet openings, it can be distributed relatively evenly over the cross-section of the chamber right from the start. Both together lead to a very even steam distribution in the area of the blow openings. This is in contrast to the prior art, where due to the strong component of the few steam flows towards the free housing wall, some blowing openings are supplied with steam more than others. The greater the number of outlet openings, the lower the exit noise.
- outlet openings are arranged on a first circle and on at least one further circle offset axially to this, and those of the further circle are located in the circumferential direction between those of the first circle. Due to the axial offset, a large number of outlet openings can be provided without great manufacturing difficulties.
- each outlet opening is designed as a jet nozzle.
- each emerging steam stream receives a distinct direction, so that it disintegrates only in the vicinity of the boundary walls.
- each jet draws steam that is already in the chamber. Overall, the distribution is very even.
- outlet openings are designed as bores with a greater length than their diameter.
- the front and rear walls of the chambers of the main distribution space are essentially flat and have a smaller distance from one another in the area of the steam valves than in the area of the free housing wall.
- the uniformity achieved at the outlet openings is maintained if the cross-section of the chambers gradually widens towards the blowing openings.
- the free housing wall is located at the lower end of the main distribution space and a trough runs in the corner formed between the front and rear wall and the partitions separating the chambers on the one hand and the free housing wall on the other hand. If condensation occurs on these walls - for example because these walls are at a lower temperature - the condensate set can run down the wall and run down the drainage channel. In any case, no water gets to the blow openings.
- valves of adjacent chambers can be offset alternately on both sides from the transverse median plane of the main distribution chamber. Such a transfer does not yet affect the even distribution.
- valves with associated actuators if they have a larger diameter, can be arranged closer together in the width direction, so that the chamber width can also be kept smaller. This allows the moisture profile to be influenced even more precisely.
- outlet openings are arranged in an annular steam outflow body which is located on the side of the valve seat opposite the free housing wall.
- the steam supplied to the steam outflow body can escape outward by approximately 90 ° with a single deflection. This results in significantly lower flow losses than in the known cases, where a deflection of approximately 180 ° was necessary.
- the housing of the steam valve should be connected to an actuator with the interposition of a heat barrier. It is therefore possible to work with a steam at a very high temperature without the actuator taking on an excessively high temperature.
- the heat barrier can be formed by an axially extending annular groove in an insert, which is connected between a housing part of larger diameter and an actuator part of smaller diameter.
- the illustrated steam blow box 1 has a free housing wall 2 on the underside, which, together with a material web 3 to be steamed, delimits a steaming chamber 4.
- This has a central main zone 5, a front entrance zone 6 and a rear exit zone 7.
- the free housing wall 7 has a plurality of rows of blowing openings 8 arranged one behind the other in the longitudinal direction, which start from a main distributor space 9.
- the entrance zone 6 there are two rows of blowing openings 10 which start from an entrance distributor space 11.
- the exit zone 7 there are two rows of blow holes 12 which start from an exit distribution space 13.
- a front steam distribution duct 14 runs, between the main distribution space 9 and the outlet distribution space 13 a rear steam distribution duct 15. The whole is surrounded by a heat insulation layer 16.
- hot steam is supplied to the front steam distribution duct 14 from a steam source. It is connected via a series of holes 19 to the input distribution space 11 and via a pipe 18 to the rear steam distribution duct 15. This is connected to the output distribution space 13 via a series of openings 17.
- the front steam distribution channel 14 is connected via a plurality of pipes 20 arranged side by side in the width direction, each with a steam valve 21 which can be actuated by a pneumatic actuator 22.
- the main distribution space 9 is divided into individual chambers 24 by a series of longitudinally extending partition walls 23, each of which is assigned a steam valve 21.
- the front wall 25 and the rear wall 26 of the main distribution space 9 and thus the chambers 24 are flat, but diverge from top to bottom.
- a channel 28 is formed by a circumferential plate 27, which is provided with a drain 29. Any condensate drops that form on the walls can therefore flow off without coming into contact with the blowing openings 8.
- the steam valve 21 has a housing 30 into which the tube 20 is welded and a valve seat 31 is screwed.
- the associated closure piece 32 is actuated by a pneumatic actuator 22 via a rod 33.
- the upper part of the housing 30 forms a steam outflow body 34, in which 16 evenly distributed outlet openings 35 and 36 are provided in two circles one above the other.
- the outlet openings 35 of the lower circle lie between the outlet openings 36 of the upper circle. All outlet openings are formed by bores, the diameter of which is approximately 5 mm and the length of which is approximately 10 mm. In this way there are jet nozzles through which the steam which has entered the interior 37 via the valve is emitted in a directed manner.
- the center line 38 of each outlet opening 35 forms an angle of approximately 72 ° with the axis 39 which is perpendicular to the free housing wall 2.
- the interior 37 is closed off by an insert 40 which is screwed into the housing 30 with a screw thread 41 of larger diameter and into which the actuator 22 is screwed with a thread 42 of smaller diameter.
- a heat barrier 43 in the form of an axially extending annular groove. Only part of the heat transferred from the housing to the insert 40 is therefore transferred to the pneumatic actuator 22.
- 35 and 36 steam jets emerge from all outlet openings. These are directed evenly on all sides with a slight inclination towards the horizontal plane. Before it meets an intermediate wall 23, front wall 25 or rear wall 26, the jet dissolves, steam which is already in the chamber 24 being carried away. Only after this largely uniform distribution does the steam continue to descend and finally into the area of the blowing openings 8, where it can be dispensed with a uniform distribution over the entire base area of the chamber 24.
- the free housing wall 2 can be curved, for example when an adaptation to a roll leading the material web 3 is to be made.
- the steam valves 21 can also be provided with other actuators, for example hydraulic, electrical or mechanical actuators.
- the steam channels 14 and 15 can also be parallel to each other instead of in series.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Dampfblaskasten zum Aufbringen von Dampf auf eine Materialbahn, wie Papier, mit einem sich über die Breite erstreckenden Haupt-Verteilerraum, der in einer freien Gehäusewand eine Vielzahl von in Querrichtung versetzten Blasöffnungen aufweist, durch Zwischenwände in nebeneinanderliegende Kammern unterteilt ist und für jede Kammer ein Dampfventil mit mehreren in den von der freien Gehäusewand abgewandten Teil der Kammer mündenden, auf einem Kreis um eine zur freien Gehäusewand etwa senkrechte Achse angeordnete und eine schräg zu dieser Achse stehende Mittellinie aufweisenden Auslaßöffnungen besitzt.The invention relates to a steam blow box for applying steam to a material web, such as paper, with a main distribution space which extends across the width and which has a plurality of blowing openings which are offset in the transverse direction in a free housing wall and is divided by partition walls into adjacent chambers and for each chamber has a steam valve with a plurality of outlet openings opening into the part of the chamber facing away from the free housing wall, arranged on a circle around an axis approximately perpendicular to the free housing wall and having a center line at an angle to this axis.
Ein solcher Dampfblaskasten ist aus Fig. 2 der US-PS 4 422 575 bekannt. Der Haupt-Verteilerraum ist an der Vorderseite und an der Rückseite durch einen zylindrischen Dampfzufuhrkanal begrenzt. In der freien Gehäusewand, die unten angeordnet und zum Innern hin konvex gebogen ist, befindet sich eine Reihe von in Querrichtung versetzten Blasöffnungen, über die Dampf in einen zwischen der Gehäusewand und der darunter befindlichen Materialbahn gebildeten Bedampfungsraum strömen kann. Der Auslaß ist in wenige Auslaßöffnungen unterteilt, welche den Ventilsitz umgeben, einen verhältnismäßig großen Querschnitt haben und im wesentlichen nach unten gerichtet sind. Bei einer Alternative nach Fig. 3 sind mehrere Reihen von Blasöffnungen in Längsrichtung hintereinander in der freien Gehäusewand des Haupt-Verteilerraums vorgesehen. Ein Dampfzuleitungsrohr durchsetzt diesen Haupt-Verteilerraum. Das Ventil ist über einen vertikal stehenden Hohlzylinder mit einem Bereich nahe der freien Gehäusewand verbunden.Such a steam blow box is known from FIG. 2 of US Pat. No. 4,422,575. The main distribution room is delimited at the front and at the rear by a cylindrical steam supply duct. In the free housing wall, which is arranged at the bottom and is convexly curved towards the inside, there is a series of transversely offset blowing openings via which steam can flow into an evaporation space formed between the housing wall and the material web beneath it. The outlet is divided into a few outlet openings, which surround the valve seat, have a relatively large cross section and are directed essentially downwards. In an alternative according to FIG. 3, several rows of blowing openings are provided one behind the other in the longitudinal direction in the free housing wall of the main distribution space. A steam feed pipe passes through this main distribution room. The valve is connected to an area near the free housing wall via a vertically standing hollow cylinder.
Derartige Dampfblaskästen werden hauptsächlich bei der Papierherstellung verwendet. Die Temperaturerhöhung, die infolge der Dampfkondensation auf der Materialbahn auftritt, erlaubt eine bessere Entwässerung, so daß der spätere Trocknungsvorgang verkürzt werden kann. Außerdem läßt sich mit Hilfe der Ventile die Dampfzufuhr so steuern, daß ein gewünschtes Feuchtigkeitsprofil über die Breite erzielt wird. Da sich die Materialbahn mit erheblicher Geschwindigkeit unter dem Dampfblaskasten hindurch bewegt, steht für den Bedampfungsvorgang nur eine kurze Zeit zur Verfügung. Ungleichmäßigkeiten in der Dampverteilung führen zu erheblichen Temperaturunterschieden und damit zu unterschiedlichen Endfeuchten quer über die Bahn.Such steam blow boxes are mainly used in papermaking. The increase in temperature that occurs as a result of steam condensation on the material web permits better dewatering, so that the subsequent drying process can be shortened. In addition, the steam supply can be controlled with the help of the valves so that a desired moisture profile across the width is achieved. Since the material web moves under the steam blower box at a considerable speed, the steaming process is only available for a short time. Irregularities in the steam distribution lead to considerable temperature differences and thus to different final moisture levels across the web.
Der Erfindung liegt die Aufgabe zugrunde, einen Dampfblaskasten der eingangs beschriebenen Art anzugeben, bei dem die Verteilung des aus jeder Kammer austretenden Dampfes gleichmäßiger gehalten werden kann.The invention has for its object to provide a steam blow box of the type described in the introduction, in which the distribution of the steam emerging from each chamber can be kept more uniform.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Mittellinien der Auslaßöffnungen einen Winkel von mindestens 60° mit der Achse einschließen und daß mindestens zwölf Auslaßöffnungen vorgesehen sind.This object is achieved in that the center lines of the outlet openings enclose an angle of at least 60 ° with the axis and that at least twelve outlet openings are provided.
Bei dieser Konstruktion haben die austretenden Dampfströme eine starke Komponente senkrecht zur genannten Achse, also parallel zur freien Gehäusewand. Es dauert daher eine gewisse Zeit, bis der Dampf die Blaslöcher erreicht. Da der Dampf über eine größere Zahl von Auslaßöffnungen abgegeben wird, kann er bereits von Anfang an verhältnismäßig gleichmäßig über den Querschnitt der Kammer verteilt werden. Beides zusammen führt dazu, daß im Bereich der Blasöffnungen eine sehr gleichmäßige Dampfverteilung vorhanden ist. Dies steht im Gegensatz zum Stand der Technik, wo wegen der starken Komponente der wenigen Dampfströme in Richtung auf die freie Gehäusewand einige Blasöffnungen stärker mit Dampf versorgt werden als andere. Je größer die Zahl der Auslaßöffnungen, umso geringer ist auch das Austrittsgeräusch.In this construction, the emerging steam flows have a strong component perpendicular to the axis mentioned, that is, parallel to the free housing wall. It therefore takes some time for the steam to reach the blow holes. Since the steam is discharged through a larger number of outlet openings, it can be distributed relatively evenly over the cross-section of the chamber right from the start. Both together lead to a very even steam distribution in the area of the blow openings. This is in contrast to the prior art, where due to the strong component of the few steam flows towards the free housing wall, some blowing openings are supplied with steam more than others. The greater the number of outlet openings, the lower the exit noise.
Durch Versuche wurde festgestellt, daß man optimale Ergebnisse erhält, wenn die Mittellinien der Auslaßöffnungen einen Winkel von 69° bis 75°, vorzugsweise etwa 72°, mit der Achse einschließen.Experiments have shown that optimum results are obtained if the center lines of the outlet openings form an angle of 69 ° to 75 °, preferably approximately 72 °, with the axis.
Es empfiehlt sich, zwischen 16 und 48, vorzugsweise 32, Auslaßöffnungen vorzusehen. Die große Zahl ermöglicht eine sehr gleichmäßige Verteilung des Dampfes über den Querschnitt. Je größer die Zahl, umso kleiner der Querschnitt der einzelnen Austrittsöffnungen und umso besser die Richtwirkung für den austretenden Dampfstrom.It is advisable to provide between 16 and 48, preferably 32, outlet openings. The large number enables a very even distribution of the steam over the cross section. The larger the number, the smaller the cross section of the individual outlet openings and the better the directivity for the emerging steam flow.
Eine besonders vorteilhafte Lösung sieht vor, daß die Auslaßöffnungen auf einem ersten Kreis und auf mindestens einem axial hierzu versetzten weiteren Kreis angeordnet sind und sich diejenigen des weiteren Kreises in Umfangsrichtung zwischen denjenigen des ersten Kreises befinden. Durch die axiale Versetzung lassen sich sehr viele Auslaßöffnungen ohne große Fertigungsschwierigkeiten vorsehen.A particularly advantageous solution provides that the outlet openings are arranged on a first circle and on at least one further circle offset axially to this, and those of the further circle are located in the circumferential direction between those of the first circle. Due to the axial offset, a large number of outlet openings can be provided without great manufacturing difficulties.
Mit besonderem Vorteil ist jede Auslaßöffnung als Strahldüse ausgelegt. Auf diese Weise erhält jeder austretende Dampfstrom eine ausgeprägte Richtung, so daß er erst in der Nähe der Begrenzungswände zerfällt. Außerdem saugt jeder Strahl bereits in der Kammer befindlichen Dampf mit sich. Insgesamt ergibt sich eine sehr gleichmäßige Verteilung.With particular advantage, each outlet opening is designed as a jet nozzle. In this way, each emerging steam stream receives a distinct direction, so that it disintegrates only in the vicinity of the boundary walls. In addition, each jet draws steam that is already in the chamber. Overall, the distribution is very even.
Eine besonders einfache Ausführungsform solcher Strahldüsen ergibt sich, wenn die Auslaßöffnungen als Bohrungen mit größerer Länge als ihrem Durchmesser ausgebildet sind.A particularly simple embodiment of such jet nozzles is obtained if the outlet openings are designed as bores with a greater length than their diameter.
Versuche haben optimale Ergebnisse gezeigt, wenn die Auslaßöffnungen einen Bohrungsdurchmesser von 3 bis 8 mm, vorzugsweise etwa 5 mm, haben.Experiments have shown optimal results when the outlet openings have a bore diameter of 3 to 8 mm, preferably about 5 mm.
Bei einer bevorzugten Ausführungsform folgen in der freien Gehäusewand mehrere Reihen in Querrichtung versetzter Blasöffnungen in Längsrichtung aufeinander. Dem Bedampfungsraum wird daher an mehreren über seine Länge verteilten Stellen Dampf zugeführt. Dies ergibt eine sehr intensive Behandlung der Materialbahn. Trotz der hierbei erforderlichen größeren Länge der Kammern wird durch die zuvor beschriebenen Maßnahmen eine gleichmäßige Beschickung aller Blasöffnungen erreicht.In a preferred embodiment, several rows of blowing openings offset in the transverse direction follow one another in the longitudinal direction in the free housing wall. Steam is therefore supplied to the vaporization chamber at several points distributed over its length. This results in a very intensive treatment of the material web. Despite the larger length of the chambers required in this case, the above-described measures ensure uniform feeding of all blowing openings.
Vor Vorteil ist es auch, daß die Vorder- und Rückwand der Kammern des Haupt-Verteilerraumes im wesentlichen eben sind und im Bereich der Dampfventile einen kleineren Abstand voneinander haben als im Bereich der freien Gehäusewand. Die in Höhe der Auslaßöffnungen erzielte Gleichmäßigkeit bleibt erhalten, wenn sich der Querschnitt der Kammern allmählich zu den Blasöffnungen hin erweitert.It is also advantageous that the front and rear walls of the chambers of the main distribution space are essentially flat and have a smaller distance from one another in the area of the steam valves than in the area of the free housing wall. The uniformity achieved at the outlet openings is maintained if the cross-section of the chambers gradually widens towards the blowing openings.
Von Vorteil ist es auch, daß sich die freie Gehäusewand am unteren Ende des Haupt-Verteilerraumes befindet und in der zwischen der Vorder- bzw. Rückwand sowie den die Kammern trennenden Zwischenwänden einerseits und der freien Gehäusewand andererseits gebildeten Ecke eine Abflußrinne verläuft. Sollte es an diesem Wänden zu einer Kondensation kommen - beispielsweise weil diese Wände eine geringere Temperatur haben - kann das Kondensatz an der Wand herunter und über die Abflußrinne ablaufen. Jedenfalls gelangt kein Wasser zu den Blasöffnungen.It is also advantageous that the free housing wall is located at the lower end of the main distribution space and a trough runs in the corner formed between the front and rear wall and the partitions separating the chambers on the one hand and the free housing wall on the other hand. If condensation occurs on these walls - for example because these walls are at a lower temperature - the condensate set can run down the wall and run down the drainage channel. In any case, no water gets to the blow openings.
In weiterer Ausgestaltung können die Ventile benachbarter Kammern abwechselnd nach beiden Seiten von der Quermittelebene der Haupt-Verteilerkammer versetzt sein. Eine solche Versetzung wirkt sich auf die gleichmäßige Verteilung noch nicht aus. Andererseits können die Ventile mit zugehörigen Stellantrieben, wenn sie einen größeren Durchmesser haben, in Breitenrichtung enger nebeneinander angeordnet werden, so daß auch die Kammerbreite kleiner gehalten werden kann. Hierdurch läßt sich das Feuchtigkeitsprofil noch genauer beeinflussen.In a further embodiment, the valves of adjacent chambers can be offset alternately on both sides from the transverse median plane of the main distribution chamber. Such a transfer does not yet affect the even distribution. On the other hand, the valves with associated actuators, if they have a larger diameter, can be arranged closer together in the width direction, so that the chamber width can also be kept smaller. This allows the moisture profile to be influenced even more precisely.
Konstruktiv ist es günstig, daß die Auslaßöffnungen in einem ringförmigen Dampfausströmkörper angeordnet sind, der sich auf der der freien Gehäusewand gegenüberliegenden Seite des Ventilsitzes befindet. Der dem Dampfausströmkörper zugeführte Dampf kann mit einer einzigen Umlenkung um etwa 90° nach außen treten. Dies ergibt wesentlich geringere Strömungsverluste als in den bekannten Fällen, wo eine Umlenkung um etwa 180° erforderlich war.In terms of construction, it is favorable that the outlet openings are arranged in an annular steam outflow body which is located on the side of the valve seat opposite the free housing wall. The steam supplied to the steam outflow body can escape outward by approximately 90 ° with a single deflection. This results in significantly lower flow losses than in the known cases, where a deflection of approximately 180 ° was necessary.
Das Gehäuse des Dampfventils sollte unter Zwischenschaltung einer Wärmesperre mit einem Stellantrieb verbunden sein. Es kann daher mit einem Dampf sehr hoher Temperatur gearbeitet werden, ohne daß der Stellantrieb eine zu hohe Temperatur annimmt.The housing of the steam valve should be connected to an actuator with the interposition of a heat barrier. It is therefore possible to work with a steam at a very high temperature without the actuator taking on an excessively high temperature.
Insbesondere kann die Wärmesperre durch eine sich axial erstreckende Ringnut in einem Einsatz gebildet sein, der zwischen einem Gehäuseteil größeren Durchmessers und einem Stellantriebteil kleineren Durchmessers geschaltet ist.In particular, the heat barrier can be formed by an axially extending annular groove in an insert, which is connected between a housing part of larger diameter and an actuator part of smaller diameter.
Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten, bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen:
- Fig. 1
- einen Längsschnitt durch einen erfindungsgemäßen Dampfblaskasten gemäß der Linie A-B der Fig. 2,
- Fig. 2
- einen Teilquerschnitt längs der Linie C-D der Fig. 1 und
- Fig. 3
- einen Schnitt durch das veranschaulichte Dampfventil mit Dampfausströmkörper.
- Fig. 1
- 2 shows a longitudinal section through a steam blow box according to the invention along line AB in FIG. 2,
- Fig. 2
- a partial cross section along the line CD of Fig. 1 and
- Fig. 3
- a section through the illustrated steam valve with steam outflow body.
Der veranschaulichte Dampfblaskasten 1 besitzt an der Unterseite eine freie Gehäusewand 2, die zusammen mit einer zu bedampfenden Materialbahn 3 einen Bedampfungsraum 4 begrenzt. Dieser besitzt eine mittlere Hauptzone 5, eine vordere Eingangszone 6 und eine hintere Ausgangszone 7.The illustrated
Die freie Gehäusewand 7 weist im Bereich der Hauptzone mehrere in Längsrichtung hintereinander angeordnete Reihen von Blasöffnungen 8 auf, die von einem Haupt-Verteilerraum 9 ausgehen. In der Eingangszone 6 gibt es zwei Reihen von Blasöffnungen 10, die von einem Eingangs-Verteilerraum 11 ausgehen. Und in der Ausgangszone 7 gibt es zwei Reihen von Blaslöchern 12, die von einem Ausgangs-Verteilerraum 13 ausgehen. Zwischen dem Eingangs-Verteilerraum 11 und dem Haupt-Verteilerraum 9 verläuft ein vorderer Dampfverteilkanal 14, zwischen dem Haupt-Verteilerraum 9 und dem Ausgangs-Verteilerraum 13 ein hinterer Dampfverteilkanal 15. Das Ganze ist von einer Wärmeisolationsschicht 16 umgeben.In the area of the main zone, the free housing wall 7 has a plurality of rows of blowing
Im Betrieb wird dem vorderen Dampverteilkanal 14 Heißdampf von einer Dampfquelle zugeführt. Es ist über eine Reihe von Löchern 19 mit dem Eingangs-Verteilerraum 11 verbunden sowie über eine Rohrleitung 18 mit dem hinteren Dampfverteilkanal 15. Dieser steht über eine Reihe von Öffnungen 17 mit dem Ausgangs-Verteilerraum 13 in Verbindung. Der vordere Dampfverteilkanal 14 ist über eine Vielzahl von in Breitenrichtung nebeneinander angeordneten Rohren 20 mit je einem Dampfventil 21, das durch einen pneumatischen Stellantrieb 22 betätigbar ist, verbunden.In operation, hot steam is supplied to the front
Der Haupt-Verteilerraum 9 ist durch eine Reihe von in Längsrichtung verlaufenden Zwischenwänden 23 in einzelne Kammern 24 unterteilt, denen je ein Dampfventil 21 zugeordnet ist. Die Vorderwand 25 und die Rückwand 26 des Haupt-Verteilerraums 9 und damit der Kammern 24 sind eben, divergieren aber von oben nach unten. Am unteren Ende ist durch ein umlaufendes Blech 27 eine Rinne 28 gebildet, die mit einem Abfluß 29 versehen ist. Eventuell an den Wänden sich bildende Kondensattropfen können daher abfließen, ohne daß sie mit den Blasöffnungen 8 in Berührung kommen.The
Das Dampfventil 21 besitzt ein Gehäuse 30, in das das Rohr 20 eingeschweißt und ein Ventilsitz 31 eingeschraubt ist. Das zugehörige Verschlußstück 32 wird über eine Stange 33 vom pneumatischen Stellantrieb 22 betätigt. Der Oberteil des Gehäuses 30 bildet einen Dampfausströmkörper 34, in welchem in zwei Kreisen übereinander je 16 gleichmäßig verteilte Auslaßöffnungen 35 und 36 vorgesehen sind. Die Auslaßöffnungen 35 des unteren Kreises liegen zwischen den Auslaßöffnungen 36 des oberen Kreises. Alle Auslaßöffnungen werden durch Bohrungen gebildet, deren Durchmesser etwa 5 mm und deren Länge etwa 10 mm beträgt. Auf diese Weise ergeben sich Strahldüsen, durch die der Dampf, der über das Ventil in den Innenraum 37 gelangt ist, gerichtet abgegeben wird. Die Mittellinie 38 jeder Auslaßöffnung 35 schließt mit der senkrecht auf der freien Gehäusewand 2 stehenden Achse 39 einen Winkel von etwa 72° ein.The
Der Innenraum 37 ist durch einen Einsatz 40 abgeschlossen, der in das Gehäuse 30 mit einem Schraubgewinde 41 größeren Durchmessers eingeschraubt ist und in den der Stellantrieb 22 mit einem Gewinde 42 kleineren Durchmessers eingeschraubt ist. Dazwischen befindet sich eine Wärmesperre 43 in der Form einer sich axial erstreckenden Ringnut. Nur ein Teil der vom Gehäuse auf den Einsatz 40 übertragenen Wärme wird daher auf den pneumatischen Stellantrieb 22 übertragen.The interior 37 is closed off by an
Im Betrieb treten aus allen Auslaßöffnungen 35 und 36 Dampfstrahlen aus. Diese sind mit geringer Neigung gegenüber der horizontalen Ebene gleichmäßig nach allen Seiten gerichtet. Bevor sie auf eine Zwischenwand 23, Vorderwand 25 oder Rückwand 26 treffen, löst sich der Strahl auf, wobei bereits in der Kammer 24 befindlicher Dampf mitgerissen wird. Erst nach dieser weitgehend gleichmäßigen Verteilung gelangt der Dampf weiter nach unten und schließlich bis in den Bereich der Blasöffnungen 8. Dort kann er mit gleichmäßiger Verteilung über die gesamte Grundfläche der Kammer 24 abgegeben werden.In operation, 35 and 36 steam jets emerge from all outlet openings. These are directed evenly on all sides with a slight inclination towards the horizontal plane. Before it meets an
Von der beschriebenen Ausführungsform kann in vielfacher Hinsicht abgewichen werden, ohne vom Grundgedanken der Erfindung abzuweichen. So kann die freie Gehäusewand 2 gekrümmt sein, beispielsweise wenn eine Anpassung an eine die Materialbahn 3 führende Walze vorgenommen werden soll. Die Dampfventile 21 können auch mit anderen Stellantrieben versehen werden, beispielsweise hydraulischen, elektrischen oder mechanischen Stellantrieben. Die Dampfkanäle 14 und 15 können statt in Reihe auch parallel zueinander liegen.The described embodiment can be varied in many respects without departing from the basic idea of the invention. For example, the
Claims (14)
- Steam distributor for applying steam to a web such as paper, having a main distribution space which extends over the width and has in a free housing wall a multiplicity of blowing apertures offset in the transverse direction and is subdivided by partitions into adjacent chambers and possesses, for each chamber, a steam valve having several outlet apertures opening into the part of the chamber facing away from the free housing wall, which outlet apertures are arranged in a circle around an axis substantially perpendicular to the free housing wall and have a centre line inclined towards this axis, characterised in that the centre lines (38) of the outlet apertures (35, 36) enclose an angle of at least 60° with the axis (39) and in that at least twelve outlet apertures are provided
- Steam distributor according to claim 1, characterised in that the centre lines (38) of the outlet apertures (35, 36) enclose an angle of 69° to 75° with the axis (39).
- Steam distributor according to claim 1 or 2, characterised in that there are provided between 16 and 48 outlet apertures, preferably 32 outlet apertures (35, 36).
- Steam distributor according to one of claims 1 to 3, characterised in that the outlet apertures (35, 36) are arranged in a first circle and in at least one further circle axially offset relative thereto, and those of the further circle are located in the peripheral direction between those of the first circle.
- Steam distributor according to claims 1 to 4, characterised in that each outlet aperture (35, 36) is designed as a jet nozzle.
- Steam distributor according to one of claims 1 to 5, characterised in that the outlet apertures (35, 36) are formed as holes having a length greater than their diameter.
- Steam distributor according to one of claims 1 to 6, characterised in that the outlet apertures (35, 36) have a hole diameter of 3 to 8 mm, preferably approximately 5 mm.
- Steam distributor according to one of claims 1 to 7, characterised in that, in the free housing wall (2), several rows of blowing apertures (8) offset in the transverse direction are arranged successively in the longitudinal direction.
- Steam distributor according to one of claims 1 to 8, characterised in that the front and rear walls (25, 26) of the chambers (24) of the main distribution space (9) are substantially flat and are at a smaller distance from each other in the region of the steam valves (21) than in the region of the free housing wall (2).
- Steam distributor according to one of claims 1 to 9, characterised in that the free housing wall (2) is located at the lower end of the main distribution space (9) and, in the corner formed between, on the one hand, the front and rear walls (25, 26) and the partitions (23) separating the chambers (24), and on the other hand the free housing wall (2), there runs a drain channel (28).
- Steam distributor according to one of claims 1 to 10, characterised in that the valves (21) of adjacent chambers (24) are offset alternately on either side of the transverse centre plane of the main distribution chamber (9).
- Steam distributor according to one of claims 1 to 11, characterised in that the outlet apertures (35, 36) are arranged in an annular steam ejection nozzle (34) which is located on the side of the valve seat (31) opposite the free housing wall (2).
- Steam distributor according to one of claims 1 to 12, characterised in that the housing (30) of the steam valve (21) is connected to its actuator (22) with the interposition of a thermal barrier (43).
- Steam distributor according to claim 13, characterised in that the thermal barrier (43) is formed by an annular groove extending axially in an insert (40) which is connected between a housing part of larger diameter and an actuator part of smaller diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88100380T ATE90125T1 (en) | 1987-01-20 | 1988-01-13 | STEAM BLOWER BOX. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3701407A DE3701407C1 (en) | 1987-01-20 | 1987-01-20 | Steam box |
| DE3701407 | 1987-01-20 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0275915A2 EP0275915A2 (en) | 1988-07-27 |
| EP0275915A3 EP0275915A3 (en) | 1991-04-10 |
| EP0275915B1 true EP0275915B1 (en) | 1993-06-02 |
Family
ID=6319085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88100380A Expired - Lifetime EP0275915B1 (en) | 1987-01-20 | 1988-01-13 | Steam distributor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5059285A (en) |
| EP (1) | EP0275915B1 (en) |
| AT (1) | ATE90125T1 (en) |
| CA (1) | CA1322881C (en) |
| DE (1) | DE3701407C1 (en) |
| ES (1) | ES2041274T3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2155222C (en) * | 1990-06-29 | 1997-11-11 | Paul Dennis Trokhan | Process for making absorbent paper web |
| DE4125062C2 (en) * | 1991-07-29 | 1994-12-08 | Vib Apparatebau Gmbh | Steam box |
| US5304703A (en) * | 1992-07-27 | 1994-04-19 | Cal-Sine Environmental, Inc. | Process for disposal of volatile hazardous wastes |
| FI107065B (en) | 1999-10-21 | 2001-05-31 | Metso Paper Automation Oy | Paper machine steam box |
| FI110627B (en) | 2000-04-06 | 2003-02-28 | Metso Paper Automation Oy | A method for blowing steam against a paper web and a steam box for a paper machine |
| DE102004014597B4 (en) * | 2004-03-23 | 2008-02-14 | M-Real Oyj | Apparatus for treating a paper or board web |
| US8061055B2 (en) * | 2007-05-07 | 2011-11-22 | Megtec Systems, Inc. | Step air foil web stabilizer |
| DE102010041762A1 (en) * | 2010-09-30 | 2012-04-05 | Voith Patent Gmbh | Device for moistening the surface layer of a fibrous web |
| EP2808087B1 (en) * | 2013-05-28 | 2019-02-27 | Valmet Technologies, Inc. | Device for treating a fibre web |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3945881A (en) * | 1974-09-11 | 1976-03-23 | Lodding Engineering Corporation | Fourdrinier steam shower |
| US4268976A (en) * | 1978-07-14 | 1981-05-26 | Dove Norman F | Steam distribution apparatus |
| US4331510A (en) * | 1978-11-29 | 1982-05-25 | Weyerhaeuser Company | Steam shower for improving paper moisture profile |
| US4320583A (en) * | 1980-06-23 | 1982-03-23 | Dove Norman F | Steam distribution apparatus for flat paper sheet |
| US4358900A (en) * | 1980-09-24 | 1982-11-16 | Dove Norman F | Apparatus to supply steam including steam evacuation |
| US4422575A (en) * | 1981-08-17 | 1983-12-27 | Dove Norman F | Steam distributor with plug valve |
| JPH01501490A (en) * | 1986-02-04 | 1989-05-25 | ベロイト・コーポレイション | Control valve for steam box |
| DE3701406A1 (en) * | 1987-01-20 | 1988-07-28 | Vib Apparatebau Gmbh | DEVICE FOR APPLYING STEAM TO A MATERIAL RAIL LIKE PAPER |
-
1987
- 1987-01-20 DE DE3701407A patent/DE3701407C1/en not_active Expired
-
1988
- 1988-01-13 ES ES198888100380T patent/ES2041274T3/en not_active Expired - Lifetime
- 1988-01-13 EP EP88100380A patent/EP0275915B1/en not_active Expired - Lifetime
- 1988-01-13 AT AT88100380T patent/ATE90125T1/en not_active IP Right Cessation
- 1988-01-15 US US07/144,934 patent/US5059285A/en not_active Expired - Lifetime
- 1988-01-19 CA CA000556786A patent/CA1322881C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3701407C1 (en) | 1988-04-07 |
| EP0275915A3 (en) | 1991-04-10 |
| US5059285A (en) | 1991-10-22 |
| ES2041274T3 (en) | 1993-11-16 |
| CA1322881C (en) | 1993-10-12 |
| ATE90125T1 (en) | 1993-06-15 |
| EP0275915A2 (en) | 1988-07-27 |
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