EP4038235A1 - Device and method for applying process air - Google Patents
Device and method for applying process airInfo
- Publication number
- EP4038235A1 EP4038235A1 EP20750658.5A EP20750658A EP4038235A1 EP 4038235 A1 EP4038235 A1 EP 4038235A1 EP 20750658 A EP20750658 A EP 20750658A EP 4038235 A1 EP4038235 A1 EP 4038235A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- applicator
- diffuser
- outlet opening
- web
- process air
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004140 cleaning Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 239000000835 fiber Substances 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/10—Suction rolls, e.g. couch rolls
-
- 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
- D21F5/20—Waste heat recovery
Definitions
- the invention relates to an applicator for applying process air to a running fibrous web, in particular a paper or tissue web according to the preamble of claim 1, a machine for producing or processing a fibrous web according to the preamble of claim 7, and a method for applying process air a running fibrous web according to the preamble of claim 13.
- a running fibrous web in particular a paper or tissue web according to the preamble of claim 1
- a machine for producing or processing a fibrous web according to the preamble of claim 7 and a method for applying process air a running fibrous web according to the preamble of claim 13.
- the aim of such a treatment can be to increase the web temperature and thereby increase the viscosity of the water present in the web. This can lead to easier drainability of the fibrous web.
- a so-called steam blower box which is provided for applying steam to the web.
- EP 2 896 743 it is therefore proposed to act on the paper web with the exhaust air from the drying hood of a Yankee cylinder instead of steam.
- Such Yankee cylinders are common, for example, in tissue machines, but are also used for other types of paper, for example so-called MG papers.
- the exhaust air from such a dryer hood is usually very hot and humid and is therefore in principle just as suitable as steam for increasing the temperature of the paper web.
- steam and exhaust air from the hood which EP 2 896 743 does not take into account. Since the hot air in the dryer hood is blown onto the paper web, fragments of fibers or fillers which contaminate the exhaust air from the hood are released from there.
- an applicator for applying process air to a moving fibrous web, in particular a paper or tissue web.
- the applicator comprises an outer wall with at least one air inlet and at least one outlet opening.
- the applicator further comprises a diffuser which is arranged in the flow path between the at least one air inlet and the at least one outlet opening and which is at a distance of more than 0.5 cm, in particular more than 2 cm, from the outlet opening. In particularly advantageous embodiments, the distance can also be more than 5 cm or more than 10 cm.
- a diffuser built into the flow passage in this way serves, on the one hand, to make the flow uniform and to ensure the desired pressure conditions of the process air when it comes into contact with the fibrous web.
- Such an equalization is not described in the applicator for process air known from the prior art.
- dirt particles will usually be deposited in or on such a diffuser, mainly from the process air.
- the distance between the diffuser and the fibrous web provided according to the invention has the positive effect that smaller deposits on the diffuser do not negatively affect the web path, as could happen with a diffuser located very close to the web.
- the greater distance to the track also allows easier maintenance of the diffuser. Depending on the version, it may even be possible to continue operating the system during maintenance.
- the diffuser can be designed as a pipe diffuser.
- a tubular line can be provided which extends over the entire width of the applicator in the cross-machine direction or a part thereof.
- the cross section of the tubular line can be circular, but can also have a different shape, in particular an elliptical shape.
- the cross section of the pipe diffuser can also vary over the width of the applicator.
- the wall of the tubular line usually has a large number of openings for the process air to exit. These can be circular openings. However, the openings can also have other shapes, such as, in particular, a hexagonal shape.
- the openings can all be identical. Alternatively, however, the cross section of the openings can also vary. For example, the openings at the edge can be larger or smaller than in the middle.
- the opening size and / or wall thickness of the diffuser can be suitably adapted, for example in order to achieve a desired pressure loss through the diffuser.
- the diffuser can consist of a single segment. However, it can also comprise or consist of several, in particular two, segments.
- At least one diffuser segment can be removed from the applicator from an end face.
- the combination of the distance from the web with the front-side removability is particularly advantageous with regard to the maintenance of the diffuser.
- the diffuser can then be removed from the applicator without any problems via the end face, even if the fibrous web is still in contact and the outlet opening of the applicator is blocked.
- the entire applicator does not have to be removed for maintenance. This minimizes the effort for maintenance and cleaning.
- the comparatively inexpensive diffuser is available twice in the paper mill.
- a new or already cleaned diffuser can be inserted immediately after the dirty diffuser has been removed.
- the diffuser can be replaced without having to switch off the machine. In any case, any machine downtime, no matter how brief, can be used to replace the diffusers.
- a diffuser made up of two segments becomes particularly clear.
- a removal option can be provided from each of the two end faces.
- the segments to be removed are then shorter, usually half as long as the entire diffuser, and are therefore much easier to handle.
- the example of tissue machines is given here.
- a single-width machine nowadays has a machine width of and 280 cm.
- a pipe diffuser of this length can be removed from the applicator via an opening at the end with reasonable effort.
- the larger, double-wide tissue machines then already have a machine width of approx. 560 cm. The handling of such long pipe diffusers already requires considerably more effort.
- the diffuser consists of several, in particular shorter, segments which can be removed individually through one or two end openings.
- a deflector in particular a deflector plate, is arranged between the diffuser and the outlet opening.
- the deflector can in particular be arranged in such a way that, when the applicator is used as intended, it is arranged between the diffuser and the fibrous web that it completely or largely covers the diffuser, so that particles which emerge from the fibrous web through the outlet opening do not appear hit the diffuser, but be intercepted by the deflector.
- Contamination of the diffuser by particles or drops thrown from the running fibrous web can be avoided both by the distance from the running web, but in particular by the deflector arranged in between.
- Such a deflector can not only be designed as a straight sheet metal, but can also be adapted to the contour of the diffuser.
- the deflector can be designed as an angled plate. This is particularly well suited in combination with a pipe diffuser, with the deflector being arranged like a roof over the diffuser.
- a deflector is easier to clean than a diffuser. While the cleaning of a diffuser is laborious to clean due to bores, flow-technical installations, etc., a deflector can mainly have smooth surfaces. These can then be cleaned very easily with a pressure washer or the like, for example.
- the deflector can be easily removed for cleaning purposes. This can be done, for example, via an opening at the end, which can be a separate opening at the end, or the same opening through which the diffuser can be removed.
- part of the outer wall in particular the part of the outer wall which is at the front in the direction of movement of the web, is movable, preferably designed as a movable flap.
- An outer wall designed to be movable at least in parts increases the accessibility of the inside of the housing and thus facilitates cleaning.
- an advantageously provided deflector can also be cleaned very easily, for example with a high-pressure cleaner, without having to remove it.
- the object is achieved by a machine for producing or processing a fibrous web, in particular a paper or tissue web, characterized in that the machine comprises at least one applicator according to one aspect of the present invention.
- the applicator can be set up to apply process air to a first side of the running fibrous web, the distance between the fibrous web and the at least one outlet opening being less than 5 cm, in particular less than 1 cm, preferably less than 0.5 cm .
- the outlet opening close to the fibrous web; Among other things, to avoid leakage flows in which parts of the process air escape into the machine hall. This is also possible without restriction due to the distance between the diffuser and the outlet opening.
- the machine comprises a drying cylinder, in particular a Yankee cylinder, to which a drying hood is assigned.
- the air inlet of the applicator can be connected or connectable to an air outlet of the drying hood.
- a cleaning device for cleaning the process air is preferably arranged in front of the air inlet of the applicator. By cleaning the process air in this way before it enters the applicator, it will become soiled less quickly, which significantly extends the maintenance intervals.
- a cleaning device can, for example, be a filter device.
- the cleaning device can also comprise or consist of a cyclone or a cyclone separator. Since cyclone separators require very little maintenance, the combination of such a cyclone with a separator described here further reduces the effort and time for maintenance of this part of the process air duct.
- the machine comprises a vacuum roller.
- the suction roller can be arranged opposite the applicator in such a way that the fibrous web runs between the outlet opening of the applicator and the suction roller.
- This has the advantage that the reduction in the viscosity of the water in the web by the applied process air can be used immediately.
- the fibrous web is dewatered by means of suction, whereby increased dewatering can be achieved due to the lower viscosity.
- static suctioned elements can in principle also be used at this point.
- the paper web is often supported in this area by a covering, for example a felt or a sieve. This covering then also runs between the suction roll or the vacuumed element and the outlet opening.
- the applicator is designed to be completely or partially movable, in particular pivotable, from a working position into a maintenance position. This makes it easier to change the covering.
- the paper web can also pass through a pressing device after the applicator. The web heated by the applicator is then easier to dewater in the press due to the lower viscosity of the water.
- the object is achieved by a method for applying process air to a moving fibrous web, in particular a paper or tissue web, the process air being applied by means of at least one applicator according to one aspect of the invention.
- exhaust air from a drying hood comprises or consists of the process air.
- another suitable process exhaust air can also be applied.
- the exhaust air from a vacuum blower is advantageous.
- the temperature of the process air can advantageously be between 80.degree. C. and 400.degree. C., in particular between 160.degree. C. and 310.degree.
- the process air can have a humidity between 400 g / kg dry air and 800 g / kg dry air; in particular between 600 g / kg and 650 g / kg.
- the range between 600 g / kg and 650 g / kg is advantageous, since this is an exhaust air humidity that is usually specified as the target value for the hood exhaust air in an energy-optimized operation of a drying hood.
- FIG. 1 shows schematically an applicator according to one aspect of the invention.
- FIG. 2 shows schematically an applicator according to a further aspect of the invention
- Fig. 2b shows schematically a section through an applicator according to a further aspect of the invention
- FIG. 3 shows schematically a section of a machine for producing a fibrous web according to a further aspect of the invention.
- the applicator 1 shows an applicator 1 for applying process air to a running fibrous web 7.
- the applicator comprises an outer wall 10, which can be designed as a metallic housing 10, for example.
- the process air can be fed to the applicator 1 via two air inlets 3.
- only a single air inlet 3 can be provided, or - especially in the case of double-wide tissue machines or wide MG machines - three or more air inlets 3.
- the process air can then be applied to the paper web 7 via an outlet opening 4.
- the applicator 1 shown in FIG. 1 has an outlet opening 4 which extends over the entire width of the applicator 1.
- the opening 4 is curved.
- Such an applicator 1 is preferably used in combination with a suction roll 20. The curvature of the outlet opening 4 is then adapted to the radius of the suction roll 20.
- a diffuser 2 in the form of a tubular diffuser 2 is introduced into the flow path between the air inlets 3 and the outlet opening 4.
- a tubular line is provided, which extends over the entire width of the applicator 1 in the cross-machine direction.
- the cross-section of the tubular conduit is in circular in this example, but can also have a different shape, in particular an elliptical shape.
- the wall of the tubular line has a large number of openings for the process air to exit.
- the openings are embodied as hexagonal in FIG. 1 by way of example. Often these openings are also made round, since such openings can easily be made by drilling.
- the cross section of the openings can also vary.
- the openings at the edge can be larger or smaller than in the middle.
- the opening size and / or wall thickness of the diffuser 2 can be suitably adapted, for example in order to achieve a desired pressure loss through the diffuser 2.
- the distance d of the diffuser 2 to the outlet opening 4 is greater than 0.5 cm. In the example of FIG. 1, a distance d of more than 5 cm is even advantageous.
- the deflector 5 is designed as a deflector plate 5, which is not designed as a straight sheet metal, but as an angled plate that is adapted to the contour of the diffuser 2 and is arranged over it like a roof.
- the deflector 5 can also be shaped differently. While the deflector 5 in FIG.
- the deflector 5 can be removed from the applicator 1 via an end face for maintenance work. This can in particular also take place through the opening 6 on the end face, via which the diffuser 2 or one of the diffuser segments 2a, 2b can be removed.
- the diffuser 2 in FIG. 1 is constructed from two diffuser segments 2a, 2b. These segments 2a, 2b can each be removed from the applicator 1 through an opening 6 on the end face. This allows them to be removed quickly for maintenance purposes.
- a replacement diffuser 2, 2a, 2b is advantageously in stock, which can be reinserted into the applicator 1 immediately after the soiled diffuser 2, 2a, 2b has been removed.
- FIG. 2 differs from FIG. 1 mainly in that part of the outer wall 10 is designed as a movable flap 10a. This can be a front or a rear part of the outer wall 10 as seen in the running direction of the fibrous web 7. It is usually advantageous to make a front part of the outer wall 10 movable, in particular as a movable flap 10a, since more dirt usually collects in the front part of the applicator 1 than in the rear part. In particular - but not only - in the case of applicators 1 in which the diffuser 2 cannot be removed via an opening 6 on the end face, the diffuser 2 can also be cleaned by opening the outer wall 10 frontal opening 6 can have a closure 6a.
- the closure 6a is provided by a component 6a firmly connected to the diffuser 2 or to the diffuser segment 2a. Introducing the diffuser segment 2a into the applicator 1 then automatically closes the front opening 6. Alternatively or additionally, however, a separate closure 6a can also be provided.
- the front opening 6 can thus be opened without having to remove the diffuser 2, 2a. This can be particularly advantageous if a deflector 5 is also to be removed through the opening 6 on the end face. This can be done without removing the diffuser.
- FIG. 2b shows a section through an applicator 1 according to one aspect of the invention.
- the diffuser 2 is designed as a pipe diffuser 2.
- the end face of the outer wall 10 and thus also the outlet opening 4 is designed to be curved here.
- the shortest distance between an outlet of the diffuser 2 and the outlet opening 4 is then set as the distance d.
- Fig. 3 shows a section of a machine as it is used for the production of tissue papers.
- the paper web 7 is passed over a drying cylinder 8 in the form of a steam-heated Yankee cylinder 8 for drying.
- a drying hood 9 which can be in one piece or also in several pieces, the paper web 7 is exposed to hot air in order to intensify the drying effect.
- the air in the drying hood 9 is enriched with moisture. Therefore, part of the hood air is continuously discharged as exhaust air.
- This exhaust air can have a temperature in the range between 160 ° C and 310 ° C, for example.
- the humidity depends on the operating mode of the
- Hood 9 but will often be in the range between 600 g / kg and 650 g / kg.
- Such an exhaust air is suitable in principle to be applied to the web 7 in order to reduce the viscosity. Therefore, a process air line 25 is provided in FIG. 3, via which part of the hood exhaust air is conducted as process air to an applicator 1.
- the applicator 1 is designed according to one aspect of the invention.
- the applicator 1 is arranged in connection with a suction roll 20 so that the paper web 7 runs between the suction roll 20 and the outlet opening 3 of the applicator 1.
- the paper web 7 is often supported in this area by a covering 40, for example a felt 40. This covering then also runs between the suction roll 20 and the
- a pressing device 35 can be provided.
- FIG. 3 not only is further dewatering of the paper web 7, which has previously been suitably heated by the applicator 1, carried out in the pressing device 35.
- the paper web 7 is also from the clothing 40 on the
- FIG. 3 shows the optional possibility of introducing a cleaning device 30 into the process air line 25, for example in the form of one or more cyclone separators 30. This can be advantageous if the process air is heavily contaminated with fiber parts or other particles, as is the case here in the example of exhaust air from the hood.
- a cleaning device 30 into the process air line 25, for example in the form of one or more cyclone separators 30. This can be advantageous if the process air is heavily contaminated with fiber parts or other particles, as is the case here in the example of exhaust air from the hood.
- suction roll 25 process air line 30 cleaning device 35 pressing device 40 covering d spacing
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019126591.6A DE102019126591A1 (en) | 2019-10-02 | 2019-10-02 | Device and method for applying process air |
PCT/EP2020/071787 WO2021063563A1 (en) | 2019-10-02 | 2020-08-03 | Device and method for applying process air |
Publications (3)
Publication Number | Publication Date |
---|---|
EP4038235A1 true EP4038235A1 (en) | 2022-08-10 |
EP4038235B1 EP4038235B1 (en) | 2023-07-26 |
EP4038235C0 EP4038235C0 (en) | 2023-07-26 |
Family
ID=71944138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20750658.5A Active EP4038235B1 (en) | 2019-10-02 | 2020-08-03 | Device and method for applying process air |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4038235B1 (en) |
DE (1) | DE102019126591A1 (en) |
WO (1) | WO2021063563A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT367118B (en) * | 1977-12-23 | 1982-06-11 | Escher Wyss Gmbh | DRYING PART FOR PAPER MACHINES |
SE524779C2 (en) * | 2002-12-20 | 2004-10-05 | Andritz Fiber Drying Ab | Device for drying or heat treatment of a web-shaped material |
FI124075B (en) * | 2009-03-26 | 2014-03-14 | Metso Paper Inc | A method and apparatus for controlling shrinkage of a fibrous web and a method for renewing a cutting area of a papermaking machine |
EP2896743B1 (en) * | 2014-01-20 | 2016-06-29 | Valmet S.p.A. | A process and a machine for making a tissue paper web |
FR3030705A1 (en) * | 2014-12-17 | 2016-06-24 | Andritz Perfojet Sas | INSTALLATION FOR DRYING A WET NON-WOVEN NET |
DE102015217375A1 (en) * | 2015-09-11 | 2017-03-16 | Voith Patent Gmbh | steam blow |
-
2019
- 2019-10-02 DE DE102019126591.6A patent/DE102019126591A1/en active Pending
-
2020
- 2020-08-03 EP EP20750658.5A patent/EP4038235B1/en active Active
- 2020-08-03 WO PCT/EP2020/071787 patent/WO2021063563A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP4038235B1 (en) | 2023-07-26 |
DE102019126591A1 (en) | 2021-04-08 |
WO2021063563A1 (en) | 2021-04-08 |
EP4038235C0 (en) | 2023-07-26 |
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