CN113718553A - Nozzle system for a device for the contactless treatment of a running fiber web - Google Patents
Nozzle system for a device for the contactless treatment of a running fiber web Download PDFInfo
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- CN113718553A CN113718553A CN202110545730.XA CN202110545730A CN113718553A CN 113718553 A CN113718553 A CN 113718553A CN 202110545730 A CN202110545730 A CN 202110545730A CN 113718553 A CN113718553 A CN 113718553A
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- nozzle
- overpressure
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/185—Supporting webs in hot air dryers
- D21F5/187—Supporting webs in hot air dryers by air jets
- D21F5/188—Blowing devices
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A nozzle system for an apparatus for the contact-free treatment of a running web, comprising an overpressure nozzle section and at least one direct-impingement nozzle section arranged on either side thereof, in which nozzle system the direct-impingement nozzle section is combined with the overpressure nozzle section such that no discharge channel for discharging gas is formed between them, in which nozzle system the overpressure nozzle section has a carrying surface and on both sides of this surface nozzle-hole rows formed by the nozzle holes and extending in the length direction of the nozzle system, which nozzle holes are configured to blow out gas streams which are directed relative to each other by means of curved coanda surfaces formed on each side of the carrying surface, and in which nozzle system the direct-impingement nozzle section comprises at least one row of nozzle holes formed by nozzle holes configured to blow out a gas stream which is substantially perpendicular relative to the upper surface of the direct-impingement nozzle section. The over-pressure nozzle section includes at least one row of direct impingement nozzle holes on the surface configured to provide direct impingement blow air by a flow of air directed generally perpendicular relative to the upper surface of the over-pressure nozzle section.
Description
Technical Field
The present invention relates to the technology of fiber webs. More particularly, the invention relates to a nozzle system for an apparatus for contactless treatment of a running fiber web.
Background
As is known from the prior art, a fiber web manufacturing process typically comprises an assembly formed by a plurality of apparatuses arranged in series in a production line. Typical production and processing lines include a headbox, a wire section and a press section followed by a dryer section and a winder. The production and processing line may also comprise other devices and sections for finishing the fibrous web, such as size press, calender and coating sections. The production and processing line further comprises at least one slitter-winder for forming customer rolls and a roll wrapping device. In the present description and in the following claims, fibrous webs mean, for example, paper and paperboard webs.
As is known in the art, in some applications for drying, carrying, supporting, etc. of a fibre web, such as a paper or board web, there is a need for a device that is capable of drying, cooling, supporting, carrying, etc. a travelling fibre web by means of an air flow, typically by means of an air flow, without contacting the fibre web.
With regard to the prior art relating to nozzle systems for devices for contactless treatment of a running fiber web, such as drying, cooling, supporting, carrying, etc., reference is made to publication EP 1218589B 1, which discloses an air cushion (airborne) web drying apparatus for drying a running coated fiber web, such as a paper or board web, comprising a nozzle device comprising: an overpressure nozzle extending across the fibre web and having on both sides of the nozzle, i.e. on the inlet side and the outlet side of the nozzle as seen in the direction of web travel, a nozzle hole arrangement extending across the web and comprising a nozzle slot or a continuous row of nozzle holes extending across the web and arranged to blow drying air jets that are inclined relative to each other or arranged to blow drying air jets that are directed relative to each other by means of a curved Coanda-surface; and at least one direct impingement nozzle extending across the web, in which direct impingement nozzle a plurality of nozzle slots or nozzle holes are formed for blowing out drying air substantially perpendicular with respect to the web, wherein the direct impingement nozzle is combined with the overpressure nozzle on its outlet side or inlet side in order to form a nozzle assembly such that no discharge channel for discharging humid air is formed between the direct impingement nozzle and the overpressure nozzle; the apparatus comprises two or more of said nozzle assemblies spaced from each other in the web travel direction on each side of the web, wherein the gap between two adjacent nozzle assemblies on each side of the web forms a discharge channel for discharging humid air; and the nozzle assemblies are arranged on opposite sides of the web such that there is a nozzle assembly on one side of the web opposite each discharge passage between two adjacent nozzle assemblies on the other side of the web. In this patent publication, a nozzle system is disclosed, which comprises an overpressure nozzle, which is combined with direct impingement on either side of the overpressure nozzle, so that no channel for return air is formed between the overpressure nozzle and the direct impingement nozzle.
Disclosure of Invention
The aim is to continuously improve the effectiveness of air cushion web drying, for example in order to be able to dry faster and/or to reduce the size of the dryer and increase the heat transfer capacity of the nozzle system.
It is an object of the present invention to provide a nozzle system for an arrangement for contactless treatment of a running fiber web, wherein the disadvantages of the prior art are eliminated or at least minimized.
It is another non-limiting object of the present invention to provide a new and improved nozzle system wherein the heat transfer capability of the nozzle system is increased.
In order to achieve the above objects and objects that will become apparent hereinafter, a nozzle system according to the present invention is as follows.
In the present description and claims the use of the word "upper" is assumed that the nozzle system is below the fibre web. It should be noted that this position may also be reversed or inclined with respect to the fibre web, and the term "upper" should be understood accordingly. The longitudinal direction of the nozzle system refers to the direction transverse to the main direction of travel of the fibrous web. It should also be noted that other gaseous substances may be used as the flow medium instead of air.
The nozzle system of the device according to the invention for contactless treatment of a running web, which nozzle system comprises an overpressure nozzle section and at least one direct-impingement nozzle section, which is arranged on either side of the overpressure nozzle section, and in which nozzle system the direct-impingement nozzle section is combined with the overpressure nozzle section such that no discharge channel for discharging gas is formed between the direct-impingement nozzle section and the overpressure nozzle section, in which nozzle system the overpressure nozzle section has a carrying surface and, on both sides of the carrying surface, nozzle-hole rows, which are formed by nozzle holes and extend in the length direction of the nozzle system and which are configured to blow out gas streams which are guided relative to one another by means of curved coanda surfaces formed on each side of the carrying surface, the direct impingement nozzle section comprises at least one row of nozzle holes formed by nozzle holes configured to blow out a substantially perpendicular gas flow with respect to an upper surface of the direct impingement nozzle section, wherein the overpressure nozzle section comprises at least one row of direct impingement nozzle holes on a bearing surface, the at least one row of direct impingement nozzle holes being configured to provide direct impingement blow gas by a gas flow directed substantially perpendicular with respect to the upper surface of the overpressure nozzle section.
By means of the invention, the heat transfer capacity of the nozzle system is enhanced due to the direct impingement on the bearing surface of the overpressure nozzle.
According to an advantageous feature of the invention, the nozzle system comprises two direct impingement nozzle sections arranged symmetrically on both sides of the overpressure nozzle section, and the direct impingement nozzle sections are combined with the overpressure nozzle section such that no discharge channel for discharging gas is formed between the direct impingement nozzle sections and the overpressure nozzle section.
According to an advantageous feature of the invention, the bearing surface is concave with respect to the level of the upper end of the curved coanda surface.
According to an advantageous feature of the invention, the bearing surface is level with the upper end of the curved coanda surface.
According to an advantageous feature of the invention, the nozzle system is of unitary construction and comprises an inlet channel and at least one side gas channel, and the gas to be blown out through the nozzle holes is guided from the inlet channel through an opening in a partition wall formed between the inlet channel and the side gas channel for direct impact on the nozzle holes and for overpressure nozzle holes, respectively, and the gas to be blown out through the nozzle holes of the bearing surface of the overpressure nozzle part is guided directly from the inlet channel.
According to an advantageous feature of the invention, the nozzle system is of unitary construction and comprises an inlet channel and at least one side air channel, and gas to be blown out through the nozzle bore is guided from the inlet channel through an opening in a partition wall formed between the inlet channel and the side air channel for direct impact on the nozzle bore and the nozzle bore for the overpressure nozzle bore and for the bearing surface of the overpressure nozzle portion.
According to an advantageous feature of the invention, the nozzle system is of unitary construction and comprises an inlet channel and at least one side air channel, and the gas to be blown out through the nozzle hole is guided from the inlet channel through an opening in a partition wall formed between the inlet channel and the side air channel for direct impact on the nozzle hole and for overpressure nozzle hole, respectively, and the gas to be blown out through the nozzle hole of the bearing surface of the overpressure nozzle part is guided from the inlet channel through the pressure equalizing hole via the pressure equalizing chamber.
According to an advantageous feature of the invention, the nozzle gas distribution between the direct impingement nozzle openings, the direct impingement nozzle openings of the bearing surface and the overpressure nozzle openings is as follows: 25-55% of the total gas quantity is blown off through the direct impact nozzle openings, 30-60% of the total gas quantity is blown off through the overpressure nozzle openings and 10-25% of the total gas quantity is blown off through the direct impact nozzle openings of the bearing surface.
According to an advantageous feature of the invention, the temperature of the gas used in the nozzle system is up to 500 ℃, and the velocity of the gas flow at the nozzle orifice is up to 100 m/s.
According to an advantageous feature of the invention, the diameter of the direct impact nozzle bore of the bearing surface and the diameter of the overpressure nozzle bore are in the range of 2mm-10mm, advantageously 3mm-8 mm.
According to an advantageous feature of the invention, the distance between the overpressure nozzle hole and the next row of direct impingement nozzle holes in the transverse direction of the nozzle system (i.e. in the web travel direction) is more than 15mm but less than 100mm, advantageously 40mm-60 mm.
According to an advantageous aspect of the invention, the nozzle system comprises an overpressure nozzle, the direct impingement blow on the bearing surface of the overpressure nozzle section being combined with the direct impingement blow on either side (advantageously on both sides) of the overpressure nozzle, so that no channel for return air is formed between the overpressure nozzle and the direct impingement nozzle. Preferably, the direct impingement orifices are round orifices, however other orifice shapes are possible.
According to an advantageous aspect of the invention, the direct impact bearing surface is flat.
According to an advantageous aspect of the invention, the direct impact bearing surface is concave. In this way, in case the fibre web tends to travel very close to the nozzle system, the nozzle holes can be positioned at a more ideal distance in terms of heat transfer and are less prone to clogging, which provides a more stable travel of the fibre web.
According to an advantageous aspect of the invention, the direct impingement holes are in one or several rows. The number of rows on different sides of the overpressure nozzle can be the same or different.
The arrangement according to the invention can be used in a nozzle system configuration for contactless web handling, which should be substantially straight seen from a virtual plane of the passing fiber web, and in some cases should be bent into a curved form in the cross-machine direction. The device according to the invention is particularly suitable for use in various air cushion and/or impingement nozzle systems and especially when the fibre web is to be dried by contact-free drying in connection with double-and/or single-sided coating and/or sizing.
The following aspects are achieved by the invention and its advantageous features: when the same amount of air is used, the heat transfer capacity of the nozzle system increases by 10-20%, and if the amount of air to be used increases, the heat transfer capacity increases even up to 25%. Faster drying is achieved by a more efficient nozzle system. Furthermore, energy savings can be achieved, since the heat consumption is reduced for the same drying capacity. An improved nozzle system with higher heat transfer and evaporation capabilities is achieved compared to existing nozzle technology. Thus, the nozzle system provides improved performance of air dryer technology.
Drawings
The aspects of the invention, however, as well as additional objects and advantages thereof, will best be understood by reference to the following description of some exemplary embodiments when read in conjunction with the accompanying drawings, and the invention will be described in more detail with reference to the accompanying drawings, wherein:
figure 1 schematically shows an advantageous example of a nozzle system according to an advantageous aspect of the invention in a partial three-dimensional cross-sectional view,
figure 2 schematically shows another advantageous example of a nozzle system according to an advantageous aspect of the invention in a partial three-dimensional cross-sectional view,
figure 3 schematically shows a further advantageous example of a nozzle system according to an advantageous aspect of the invention in a partial three-dimensional cross-sectional view,
figure 4 schematically shows a further advantageous example of a nozzle system according to an advantageous aspect of the invention in a partial three-dimensional cross-sectional view,
fig. 5 schematically shows, in a cross-sectional view, yet another advantageous example of a nozzle system according to an advantageous aspect of the invention, an
Fig. 6 schematically shows, in a cross-sectional view, yet another advantageous example of a nozzle system according to an advantageous aspect of the invention.
Detailed Description
In the course of this description, like numbers and symbols will be used to identify like elements, in accordance with the different views illustrating the invention. For the sake of clarity, some repetition of reference symbols is omitted in the figures.
In the example of fig. 1, the nozzle system 10 comprises an overpressure nozzle section 20 and direct impingement nozzle sections 25A, 25B arranged symmetrically on both sides of the overpressure nozzle section 20. The direct impingement nozzle portions 25A, 25B are combined with the overpressure nozzle portion 20 such that no discharge channel for discharging gas is formed between the direct impingement nozzle portions 25A, 25B and the overpressure nozzle portion 20.
The overpressure nozzle section 20 has a bearing surface 24 and, on both sides of the bearing surface 24, nozzle bore rows formed by the nozzle bores 18A, 18B and extending in the length direction of the nozzle system 10, and the nozzle bores 18A, 18B are arranged to blow out gas streams which are directed relative to each other by means of curved coanda surfaces 22A, 22B formed on each side of the bearing surface 24. The overpressure nozzle section 20 comprises on the carrying surface 24 an array of direct impingement nozzle holes 21 configured to provide direct impingement blow air by means of a gas flow directed substantially perpendicularly with respect to the upper surface of the overpressure nozzle section 20. In the example of FIG. 1, the bearing surfaces are flat between the upper ends of the curved coanda surfaces 22A, 22B and at the same level as the upper ends of the curved coanda surfaces 22A, 22B.
The direct impact nozzle portion 25A, 25B extending in the length direction of the nozzle system 10 includes at least one row of nozzle holes formed by the nozzle holes 16A, 16B, the nozzle holes 16A, 16B being formed for blowing out an air flow substantially perpendicular with respect to the upper surface of the direct impact nozzle portion 25A, 25B. The direct impact nozzle portions 25A, 25B according to fig. 1 have a flat nozzle surface, the nozzle bores 16A, 16B being located in three adjacent rows.
The nozzle system is of unitary construction and the gas to be blown out through the nozzle holes 16A, 16B, 18A, 18B, 21 is guided from the inlet channel 11 through openings 13A, 13B in the partition walls 12A, 12B between the inlet channel 11 and the side air channels 14A, 14B for overpressure nozzle holes 18A, 18B and direct impact nozzle holes 16A, 16B, respectively. The gas to be blown out through the nozzle bores 21 of the bearing surface 24 of the overpressure nozzle section 20 is guided from the intake channel 11 directly or through the side air channels 14A, 14B (fig. 5). In the figure, the direction of gas travel and flow is shown by the arrows.
The example shown in fig. 2 corresponds to the example shown in fig. 1, but instead of the bearing surface 24 being flat at the same level as the upper ends of the curved coanda surfaces 22A, 22B, the bearing surface 24 is concave in fig. 2 relative to the level of the upper ends of the curved coanda surfaces 22A, 22B. In case the passing fiber web tends to travel very close to the upper surface of the nozzle system 10, the bearing surface 24 positioned in the recess 23 provides a benefit, since the direct impingement nozzle holes 21 are located at a more ideal distance in terms of heat transfer and are less prone to clogging.
The example shown in fig. 3 corresponds to the example shown in fig. 2, but the recess 23 is wider and deeper than in the example of fig. 2.
The example shown in fig. 4 corresponds to the example shown in fig. 1, but instead of having one row of direct impact nozzle holes 21 on the bearing surface 24, there are two rows of direct impact nozzle holes 21A, 21B in fig. 4. Furthermore, more than two rows of direct impingement nozzle holes 21 may be located on the bearing surface.
The example shown in fig. 5 corresponds to the example shown in fig. 4, but the gas to be blown out through the nozzle bores 16A, 16B, 18A, 18B, 21 is guided from the inlet channel 11 through the openings 13A, 13B in the partition walls 12A, 12B between the inlet channel 11 and the side air channels 14A, 14B for directly impacting the nozzle bores 16A, 16B and the nozzle bores 21A, 21B for the overpressure nozzle bores 18A, 18B and for the bearing surfaces 24 of the overpressure nozzle portion 20.
The example shown in fig. 6 corresponds to the example shown in fig. 1, but instead gas to be blown out through the nozzle holes 21 of the bearing surface 24 of the overpressure nozzle portion 20 is guided from the inlet channel 11 via the pressure equalizing chamber 26 through the pressure equalizing holes 27. In this figure, the direction of gas travel and flow is shown by the arrows.
In the nozzle system 10 according to the invention and the examples of the figures, the gas distribution between the direct impact nozzle bores 16A, 16B, the direct impact nozzle bore 21 of the bearing surface 24 and the overpressure nozzle bores 18A, 18B is as follows: 25-55% of the total gas quantity is blown out through the direct impact nozzle holes 16A, 16B, 30-60% of the total gas quantity is blown out through the overpressure nozzle holes 18A, 18B, and 10-25% of the total gas quantity is blown out through the direct impact nozzle hole 21 of the bearing surface 24. The variation between the distribution of the gas amounts for different nozzle holes is selected according to the purpose of use of the nozzle system 10.
The diameter of the direct impact nozzle bores 16A, 16B, the diameter of the direct impact nozzle bore 21 of the bearing surface 24 and the diameter of the overpressure nozzle bores 18A, 18B are in the range from 2mm to 10mm, advantageously from 3mm to 8 mm.
The distance between the overpressure nozzle bores 18A, 18B and the next row of directly impacting nozzle bores 16A, 16B, 21 in the cross direction of the nozzle system 10 (i.e. in the web travelling direction) is more than 15mm but less than 100mm, advantageously 40-60 mm.
Depending on the purpose of use of the nozzle system 10, the upper surface level of the overpressure nozzle section 20 and the upper surface level of the direct impingement nozzle sections 25A, 25B may be at the same height level or at different height levels. Advantageously, the upper surface level of the overpressure nozzle section 20 is at a higher level than the upper surface level of the direct impingement nozzle sections 25A, 25B.
The total nozzle orifice area of direct impingement nozzle orifices 16A, 16B, 21 is typically about 40% to 150% of the total nozzle orifice area of overpressure nozzle orifices 18A, 18B.
In drying applications, the temperature of the gas used in the nozzle system 10 is up to 500 ℃, and the velocity of the gas flow at the nozzle holes 16A, 16B, 18A, 18B, 21 is up to 100 m/s.
The nozzle system 10 is configured to be positioned above or below a passing fiber web (not shown) for drying, cooling, carrying and/or supporting the fiber web (e.g. a paper or paperboard web), etc. The nozzle system is capable of drying, cooling, supporting and/or carrying the passing fiber web, etc. without contacting the fiber web, by means of air flows (typically by means of air flows) blown through the overpressure nozzle portion 20 and the nozzle holes directly impacting the nozzle portions 25A, 25B. The nozzle system 10 is configured to be located in a fiber web manufacturing line, advantageously in a glue application or coating section of the fiber web manufacturing line. The nozzle system 10 is very advantageously located directly after the sizing or coating equipment of the size or coating section of the fiber web production line. The means for contact-free treatment of the advancing fiber web can be formed by one or more nozzle systems 10, whereby the nozzle system 10 can be combined with other nozzle systems, similar or different, to form one or more means for contact-free treatment of the advancing fiber web, which means are formed by one or more nozzle systems on one or both sides of the passing fiber web.
The nozzle system may be manufactured as a single beam-like structure that is completely ready for installation. Furthermore, as is clear from the figures, the nozzle system has a simple structure and is easy to manufacture and install.
The solution of the nozzle system provides a more efficient heat transfer with the same amount of drying air per square meter, which is an important advantage of the invention. On the other hand, a significantly higher heat transfer effect can be obtained at the same blowing speed but with a larger air volume per square meter compared to conventional drying using overpressure nozzles, which is another important advantage of the present invention.
In the foregoing description, although some functions have been described with reference to certain features, these functions may be performed by other features, whether described or not. Although features have been described with reference to certain embodiments or examples, the features may also be present in other embodiments or examples, whether described or not. The invention has been described above by reference to some advantageous examples, to which the invention is not narrowly limited. Various modifications and changes may be made within the scope of the present invention as defined in the appended claims.
Claims (11)
1. Nozzle system for a device for the contact-free treatment of a running web, the nozzle system (10) comprising an overpressure nozzle section (20) and at least one direct impingement nozzle section (25A, 25B) arranged on either side of the overpressure nozzle section (20), and in which nozzle system (10) the direct impingement nozzle section (25A, 25B) is combined with the overpressure nozzle section (20) such that no discharge channel for discharging gas is formed between the direct impingement nozzle section (25A, 25B) and the overpressure nozzle section (20), in which nozzle system (10) the overpressure nozzle section (20) has a bearing surface (24) and, on both sides of the bearing surface (24), a nozzle hole discharge formed by nozzle holes (18A, 18B) and extending in the length direction of the nozzle system (10), and the nozzle bores (18A, 18B) are configured to blow out gas streams which are directed relative to one another by means of curved coanda surfaces (22A, 22B) formed on each side of the carrying surface (24), in the nozzle system (10), the direct impact nozzle portion (25A, 25B) includes at least one nozzle hole row formed of nozzle holes (16A, 16B) configured to blow out an air flow substantially perpendicular with respect to an upper surface of the direct impact nozzle portion (25A, 25B), characterized in that the overpressure nozzle section (20) comprises at least one row of direct impact nozzle bores (21) on the bearing surface (24), the at least one row of direct impingement nozzle holes (21) is configured to provide direct impingement blow air by means of a gas flow directed substantially perpendicularly with respect to the upper surface of the overpressure nozzle portion (20).
2. A nozzle system according to claim 1, characterized in that the nozzle system (10) comprises two direct impingement nozzle sections (25A, 25B) arranged symmetrically on both sides of the overpressure nozzle section (20), and that the direct impingement nozzle sections (25A, 25B) are combined with the overpressure nozzle section (20) such that no discharge channels for the exhaust gases are formed between the direct impingement nozzle sections (25A, 25B) and the overpressure nozzle section (20).
3. A nozzle system according to claim 1 or 2, wherein the bearing surface (24) is concave relative to the level of the upper end of the curved coanda surface (22A, 22B).
4. A nozzle system according to claim 1 or 2, wherein the bearing surface (24) is level with the upper end of the curved coanda surface (22A, 22B).
5. A nozzle system according to any one of the preceding claims, characterized in that the nozzle system (10) is of unitary construction, and comprising an intake channel (11) and at least one side air channel (14A, 14B), and gas to be blown out through the nozzle holes (16A, 16B, 18A, 18B, 21) is guided from the intake channel (11) through openings (13A, 13B) formed in a partition wall (12A, 12B) between the intake channel (11) and the side air channel (14A, 14B), for the direct impingement nozzle bores (16A, 16B) and for the overpressure nozzle bores (18A, 18B) respectively, and the gas to be blown out through the nozzle bores (21) of the bearing surface (24) of the overpressure nozzle part (20) is guided directly from the inlet channel (11).
6. Nozzle system according to any of the preceding claims, characterized in that the nozzle system (10) is of unitary construction and comprises an air inlet channel (11) and at least one side air channel (14A, 14B), and that the gas to be blown out through the nozzle bores (16A, 16B, 18A, 18B, 21) is guided from the air inlet channel (11) through openings (13A, 13B) formed in a partition wall (12A, 12B) between the air inlet channel (11) and the side air channels (14A, 14B) for the direct impingement nozzle bores (16A, 16B) and the nozzle bores (21) for the overpressure nozzle bores (18A, 18B) and for the bearing surface (24) of the overpressure nozzle portion (20).
7. A nozzle system according to any one of the preceding claims, characterized in that the nozzle system (10) is of unitary construction, and comprising an intake channel (11) and at least one side air channel (14A, 14B), and gas to be blown out through the nozzle holes (16A, 16B, 18A, 18B, 21) is guided from the intake channel (11) through openings (13A, 13B) formed in a partition wall (12A, 12B) between the intake channel (11) and the side air channel (14A, 14B), for the direct impingement nozzle bores (16A, 16B) and for the overpressure nozzle bores (18A, 18B) respectively, and the gas to be blown out through the nozzle bores (21) of the bearing surface (24) of the overpressure nozzle part (20) is guided from the inlet channel (11) through pressure equalizing apertures (27) via pressure equalizing chambers (26).
8. A nozzle system according to any one of the preceding claims, characterized in that in the nozzle system (10) the gas distribution between the direct impact nozzle bore (16A, 16B), the direct impact nozzle bore (21) of the carrying surface (24) and the overpressure nozzle bore (18A, 18B) is as follows: 25-55% of the total gas quantity is blown out through the direct impact nozzle openings (16A, 16B), 30-60% of the total gas quantity is blown out through the overpressure nozzle openings (18A, 18B), and 10-25% of the total gas quantity is blown out through the direct impact nozzle openings (21) of the bearing surface (24).
9. A nozzle system according to any one of the preceding claims, characterized in that the temperature of the gas used in the nozzle system (10) is up to 500 ℃ and the velocity of the gas flow at the nozzle holes (16A, 16B, 18A, 18B, 21) is up to 100 m/s.
10. Nozzle system according to any of the preceding claims, characterized in that the diameter of the direct impact nozzle bores (16A, 16B), the diameter of the direct impact nozzle bores (21) of the bearing surface (24) and the diameter of the overpressure nozzle bores (18A, 18B) are in the range of 2-10 mm, and advantageously 3-8 mm.
11. Nozzle system according to any of the preceding claims, characterized in that the distance between the overpressure nozzle aperture (18A, 18B) and the direct impact nozzle aperture (16A, 16B, 21) of the next row in the web travel direction is larger than 15mm but smaller than 100mm, advantageously 40-60 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20205530 | 2020-05-26 | ||
| FI20205530 | 2020-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113718553A true CN113718553A (en) | 2021-11-30 |
| CN113718553B CN113718553B (en) | 2023-07-25 |
Family
ID=75674606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110545730.XA Active CN113718553B (en) | 2020-05-26 | 2021-05-19 | Nozzle system for a device for the contactless treatment of a travelling fibre web |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3916150A1 (en) |
| CN (1) | CN113718553B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI130896B1 (en) * | 2022-03-14 | 2024-05-14 | Valmet Technologies Oy | Pulp dryer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4274210A (en) * | 1978-09-11 | 1981-06-23 | Valmet Oy | Gas nozzle for use in treating material webs |
| US4384666A (en) * | 1980-03-28 | 1983-05-24 | Valmet Oy | Nozzle apparatus for handling web material |
| CA2010130A1 (en) * | 1989-02-17 | 1990-08-17 | Ilkka Jokioinen | Arrangement of nozzles with "negative pressure intended for treatment of mobile material webs |
| CN1081485A (en) * | 1992-03-19 | 1994-02-02 | 维美德造纸机械有限公司 | Contact-free air-drying web method and the blow and the pulp web drier that use this method |
| US6598315B1 (en) * | 1999-06-30 | 2003-07-29 | Metso Paper, Inc. | Nozzle arrangement in airborne web-drying and method for improving heat transfer in airborne web-drying |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3549070A (en) * | 1969-02-27 | 1970-12-22 | Tec Systems | Floatation of sheet materials |
| DE2613135C3 (en) * | 1976-03-27 | 1978-11-23 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Air cushion nozzle |
-
2021
- 2021-04-23 EP EP21170077.8A patent/EP3916150A1/en active Pending
- 2021-05-19 CN CN202110545730.XA patent/CN113718553B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4274210A (en) * | 1978-09-11 | 1981-06-23 | Valmet Oy | Gas nozzle for use in treating material webs |
| US4384666A (en) * | 1980-03-28 | 1983-05-24 | Valmet Oy | Nozzle apparatus for handling web material |
| CA2010130A1 (en) * | 1989-02-17 | 1990-08-17 | Ilkka Jokioinen | Arrangement of nozzles with "negative pressure intended for treatment of mobile material webs |
| CN1081485A (en) * | 1992-03-19 | 1994-02-02 | 维美德造纸机械有限公司 | Contact-free air-drying web method and the blow and the pulp web drier that use this method |
| US6598315B1 (en) * | 1999-06-30 | 2003-07-29 | Metso Paper, Inc. | Nozzle arrangement in airborne web-drying and method for improving heat transfer in airborne web-drying |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3916150A1 (en) | 2021-12-01 |
| CN113718553B (en) | 2023-07-25 |
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