EP2694727A1 - Method for drying a fibrous web in a drying device, and drying device - Google Patents
Method for drying a fibrous web in a drying device, and drying deviceInfo
- Publication number
- EP2694727A1 EP2694727A1 EP12713055.7A EP12713055A EP2694727A1 EP 2694727 A1 EP2694727 A1 EP 2694727A1 EP 12713055 A EP12713055 A EP 12713055A EP 2694727 A1 EP2694727 A1 EP 2694727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dry
- drying
- drying device
- individual
- blowing
- 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
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
Definitions
- the invention relates to a method for drying a fibrous web in a drying apparatus, in which the fibrous web is guided in the train under repeated deflection by a plurality of mutually parallel and Bru arrangementswegabitese descriptive dry spaces through the drying device and is acted upon on both sides with a dry medium, in particular hot air for heat transfer ,
- the invention further relates to a drying device.
- the applied over the blowing devices hot air is used for heat transport to the fibrous web. Due to the long in such a drying devices Bru arrangementswegabitese in order to avoid excessive stress on the fibrous web in the direction of gravity between the arranged on both sides of a dry space pulleys, required to support the fibrous web by means of an air cushion in this area. Stable operating conditions when passing through the dry intermediate spaces can be achieved only by low flow rates of the applied dry medium, special geometries of the outlet openings, in particular arranged in the below the fibrous web and at this effective blowing devices and different distances between the outlet openings of the above and below a single Bahn arrangementwegabiteses arranged blowing device be ensured to this and thus the fibrous web.
- the blowing device arranged below a web guide path section serves for the formation of the required air cushion
- the structure, in particular the geometry of the outlet openings of the blowing device, their design and operating parameters as well as the operating and status parameters of the dry medium must be adapted to this function.
- the arrangement, the structure and the operating parameters of the above the web guide path section on the other fibrous web page effective blowing device should be chosen so that it does not affect the formation of the air cushion.
- One possibility of a targeted profiling of the dry medium to act on the pointing in the direction of gravity fibrous web page is not possible under these conditions.
- the greater distance of the above a Bru arrangementwegabiteses arranged blower device affects the heat exchange.
- a drying device is to be created, which is characterized by a simple fibrous web guide with simultaneously easy realizability of an active control / regulation of the drying rate along the Bru.sweges and a high dry rate in a small space.
- the individual dry spaces should be easily accessible and the fibrous web should be easily removable from them in the event of a demolition.
- the design effort is to be kept low.
- a method according to the invention for drying a fibrous web in a drying apparatus in which the fibrous web is guided through the drying apparatus in the free pass, ie free from the support by a covering with repeated deflection by a plurality of dry webs arranged parallel to each other and Bru arrangementswegabitese and both sides with a dry medium , in particular hot air is acted upon for heat transfer, characterized in that the fibrous web alternately in the vertical direction in and against the Direction of gravity and vice versa is guided by the drying device.
- the leadership of the fibrous web is thus alternately unsupported by a covering from bottom to top and top to bottom or vice versa by the drying device.
- the fibrous web is guided in detail by a plurality of drying interspaces arranged parallel to one another and extending in the width direction of the drying device and in the vertical direction, and by deflection devices, in particular deflection rollers, at the transition between two adjacent drying interspaces.
- the individual dry intermediate space is for this purpose limited by blowing devices which are arranged on both sides of the web guiding path and in each case form a blowing unit.
- the vertical direction corresponds to the direction that is substantially perpendicular to a horizontal reference plane. Substantially in the vertical direction means that deviations, i. Deflections in the range of ⁇ 20 ° of the web travel path relative to the vertical still possible and are included by this term.
- the horizontal reference plane can be described for example by a floor, machine floor or a foundation.
- a web guide path section is understood to mean the path path section which is theoretically characterized by the guidance of the fibrous web.
- the individual provided for guiding the fibrous web vertically oriented Bahn arrangementwegabites is defined by the arrangement of the individual, the respective dry space for transfer from / transfer into the respective adjacent drying space associated pulleys.
- the vertical guidance of the fibrous web has the advantage that the fibrous web can be removed in the event of disruption or demolition quickly and with minimal effort from the individual drying space, especially as these in the direction of gravity in below the individual dry spaces arranged collecting and / or treatment facilities can be continued.
- the individual web guide path portions extending in the vertical direction may be realized utilizing the theoretical height theoretically available for the dryer, thereby providing high machine direction dry powers, i. considered in the longitudinal direction of the drying device can be installed in the smallest space.
- the solution according to the invention also offers the advantage of a simple and selectively adjustable loading of the fibrous web with dry medium, since this is no longer required for stabilization of the fibrous web when guided by the drying device, but only has to take over the task of heat transfer.
- the individual blowing devices can be arranged at a shorter distance to Bru outswegabites and thus to the fibrous web, whereby the efficiency is improved. High flow rates and thus high drying rates are possible.
- the dry content of the fibrous web when entering the drying device is at least 45%, preferably 50%.
- the individual fibrous web sides are at least in a region of a Bru arrangementwegabiteses within a single dry space in the same manner acted upon with dry medium. That is, the fibrous web is treated the same in this web guide path section on both fibrous web sides.
- the individual operating parameters arranged on both sides of the fibrous web Blowing devices and condition parameters of the emerging dry media are the same in this area. This improves the uniformity of the fibrous web.
- the individual fibrous web sides can also be subjected to different amounts of dry medium at least in one area of a web guide path section within a single drying space. This option makes it possible, for example, the upstream of one or different two-sided loading of the fibrous web before entering the drying device.
- the impingement of a fibrous web side in a single drying space in the width direction of the drying device and / or over the entire extent of the drying space in the vertical direction can be profiled, in particular in one or a plurality of zones stepwise or continuously controlled and / or regulated.
- the advantage consists in the possible profiling of the dry performance and thus dry rate in the different directions of the fibrous web and thus influenceability of the drying properties of the fibrous web.
- this embodiment allows a uniform drying over the entire fibrous web width while avoiding overdrying of the edge regions. Furthermore, it is possible to respond promptly and locally to changing boundary conditions.
- the design allows optimization of the drying process in each area of a single web guide path section.
- the profiling takes place as a function of at least one of the following, the mode of operation and / or geometry of a single blowing device descriptive parameter and / or state variable of the dry medium and / or parameters of the fibrous web:
- - State variables of the dry medium preferably a temperature in the range between 100 ° C to 350 ° C and / or a pressure between 400 pcal to 2000 pcal
- a plurality of dry intermediate spaces arranged parallel to one another and extending in the transverse direction and vertical direction of the drying device are combined to form a group of these deflection rollers which couple with each other and thus the respective web guide path sections.
- a plurality of groups are provided within a drying device. The individual groups are arranged and configured such that the extent of the web guide path sections extending through the individual drying interspaces in the vertical direction from one inlet into the drying device to the outlet from the drying device increases from group to group.
- the group with the maximum extent is arranged in such a way that it is only reached when there is a predefined minimum dry content of the fibrous web from the fibrous web. This is the dry content required to maintain the fibrous web above the maximum extent of the To be able to depend on the web guide path without them tearing off.
- the dry content of the fibrous web in the region of the inlet into the drying apparatus is preferably between 45% and 50%, at the outlet 90%, with at least one drying curve being provided between the two.
- a further embodiment is characterized in that in each case a plurality of dry interspaces arranged parallel to one another and extending in the transverse direction and vertical direction of the drying device and the pulleys coupling them to one another are combined to form a group, wherein the individual groups are arranged and configured in such a way that the Speed of the fibrous web in the individual groups can be controlled separately.
- This version offers the advantage of an individual adjustment of the fibrous web train and thus stress on the web.
- the supply of the individual blowing devices via an at least one individual blowing device associated and coupled with this dry medium supply system.
- the moistened dry medium present in the individual drying space after the drying process is treated and fed again as drying medium to the drying space via the blowing devices.
- the dry medium to be supplied to a dry medium and the moisture-enriched dry medium from the dry space between two adjacent blowing devices one or different blowing units in a circuit with the optional interposition of heating, especially heaters out.
- This is realized via recirculation fans arranged on both sides of a blowing unit, which are connected to the suction side with the drying gap and the pressure side with a blowing device.
- the width of the individual drying space in Machine direction variably adjustable.
- the fibrous web can be guided quickly and safely into collecting or processing devices arranged below the drying device.
- the fibrous web is separated successively or simultaneously between the individual web guide path sections in the individual drying spaces.
- the separation takes place in the deflection region between two successive dry intermediate spaces in the passage direction.
- the drying device for drying fibrous webs comprising blowing devices arranged on both sides of the theoretical web guide path for applying dry medium to the fibrous web which can be guided in the dry intermediate space formed by the latter is characterized in that the individual blowing devices are designed as blowing devices extending in the transverse direction of the drying device and in the vertical direction laminating trays extending in the vertical direction, wherein a plurality of vertically extending drying spaces for receiving Bru Replacementswegab4.000en in the machine direction adjacent to each other and above and below a single drying space pulleys for transferring the fibrous web between two adjacent drying spaces are provided, two a dry space for coupling with the adjacent drying spaces zugeo rdnete pulleys define Bru arrangementwegabexcellente.
- the drying device is free of a fibrous web supporting fabric.
- the repeated reversal allows very long Bru outswege within the drying device.
- the individual Bru outswegabitese thus formed and extending in the vertical direction can be made using the theoretically available for the drying device Height can be realized, whereby high dry performance in the machine direction, ie viewed in the longitudinal direction of the drying device can be installed in the smallest space.
- the fibrous web is guided only to the deflection substantially only in the vertical direction and stabilized by the force of gravity.
- a targeted time and location of the fibrous web with dry medium is possible, since this must serve in its main function only the heating of the fibrous web and is not required for the formation of stabilizing air cushion.
- the individual blowing devices can be arranged at a smaller distance from the web guide path section and thus to the fibrous web, whereby the efficiency is improved.
- blowing devices arranged in each case on both sides of a single web guide path section form a blowing unit.
- the individual blowing device can be designed to be subdividable into blowing zones in the transverse direction of the drying device and / or vertical direction, with means being provided for individual and / or group-wise and / or joint activation of the individual zones.
- the single blowing device consists of a plurality of vertically arranged in blowing towers blow boxes, which are designed to extend in the transverse direction of the drying device and are mounted on a frame.
- a single blowing device alone or several together is associated with a dry-medium supply system, which in the simplest case comprises a dry-medium supply unit coupled to the blowing device.
- a dry-medium supply unit coupled to the blowing device.
- recirculation fans are viewed on both sides of a single blowing unit arranged, the suction sides are connected to the drying space and pressure sides with a blowing device of the blowing unit to form a circulation system, the coupling of the pressure side with the blowing upstream of a heater for heating the introduced into the blowing device dry medium can be arranged.
- the recirculation blowers associated with a blower device are advantageously arranged and stored one above the other in a vertical direction in a blower tower. This can be carried out separately or as part of the frame.
- the fan tower may be moveable away from the dryer.
- the dry-medium supply system comprises at least one fresh air supply and at least one exhaust air discharge, which can be coupled with one and / or several circulations.
- Fresh air supply and exhaust air discharge are fluidically decoupled from each other, but can be coupled in an advantageous manner optional thermally, in particular via heat exchangers. This allows the heat of the exhaust air can be used effectively and effectively for heating the supply air to the blowing devices.
- a plurality of drying intermediate spaces arranged parallel to one another and extending in the transverse direction and vertical direction of the drying device and the deflection rollers coupling these together form a group.
- the individual groups are arranged and configured such that the extent of the web guide path sections extending through the individual drying interspaces in the vertical direction from one inlet into the drying device to the outlet from the drying device increases from group to group.
- At least one individual group is a device for controlling the speed of the fibrous web, in particular assigned speed of the pulleys for setting the web tension.
- means for adjusting the width of at least one individual drying space in the machine direction. These may include means for shifting and / or pivoting or a combination of both movements of the blowing devices.
- the means comprise rotatably mounted bearing units for two adjacently arranged blowing devices of different blowing units.
- the individual bearing unit comprises a rocker arm mounted rotatably on the frame of the drying device, at the mutually oppositely directed end regions of which the blowing devices are articulated in an articulated manner.
- the pivoting takes place via the attack of an adjusting device on a force application surface on the rocker arm.
- the actuation of a plurality of bearing units can be positively coupled.
- At least one chop-off device is provided, which separates the fibrous web in the event of disturbances in the region between two dry interstices, whereby the fibrous web residue falls in the direction of gravity. If several stripping devices are provided, they can take effect at the same time or one after another between two dry spaces.
- the individual knock-off device can be designed and arranged so that its effective range is at least over a portion of the drying device in the cross-machine direction running extending or movable, which Railereich can be set constant or adjustable.
- the fibrous web is only partially separated in this case, wherein the remaining fibrous web ruptures due to the weight of these in the direction of gravity.
- the individual stripping device is designed and arranged such that its effective range is at least over the extension of the fibrous web in the cross machine direction, preferably extending the extension of the drying device in the cross-machine direction,
- the single knock-off device comprises at least one knock-off element which is mounted on a stationary or movable carrier.
- the carrier can be mounted, in particular displaceable, in the vertical direction and / or machine direction and / or machine transverse direction.
- the carrier may also be mounted pivotably in addition or alternatively to the aforementioned possibilities.
- the knock-off element can also be mounted stationarily on it.
- the individual knock-off element can be mounted to be movable in the transverse direction of the machine and, if necessary, also to be pivotable relative thereto.
- the solution according to the invention is particularly suitable for the drying of fibrous webs of pulp fibers.
- the solution according to the invention is explained below with reference to figures. The following is shown in detail:
- FIG. 1 illustrates a simplified schematic representation of the invention
- Figure 2 shows in detail a section of a
- Figures 3a to 3f show different modification possibilities of a single blowing device
- FIG. 4 illustrates by way of example the guidance of the fibrous web in one
- FIG. 5 illustrates by way of example the individual blower units
- FIG. 6 shows, in a schematically simplified perspective view, a blower tower
- FIG. 7 illustrates the fresh air supply and exhaust air discharge
- Figure 8 shows a possible embodiment of a frame for a drying device according to the invention.
- Figure 9 shows an example of a possible embodiment of a platform part of
- FIGS. 10a to 10c illustrate a possibility according to the invention
- variable adjustment of the width of the drying space between two blowing devices of a blowing unit is a variable adjustment of the width of the drying space between two blowing devices of a blowing unit.
- Figure 1 1 illustrates a possible arrangement of gratings
- Figure 12 shows an embodiment of a drying apparatus with additional
- FIG. 13a to 13e show possible functional positions of
- FIG. 1 shows, in a schematically greatly simplified representation, the basic structure and the basic function of a drying device 1 designed according to the invention.
- the X direction corresponds to the basic direction of passage of the fibrous web F through the drying device 1. This coincides with the longitudinal direction of the drying device 1 and is therefore also referred to as the machine direction MD.
- the Y-direction describes the direction perpendicular to the machine direction MD, ie width direction of the device 1 and is referred to as the cross-machine direction CD.
- the Z-direction corresponds to the height direction, that is extension in the vertical direction.
- the drying device 1 according to the invention is a vertical drying device according to the impingement principle.
- the fibrous web F is guided by this in the free web train under repeated deflection, ie multiple changes of direction between an inlet 4 in the drying device 1 and an outlet 5 from the drying device 1 substantially only in the vertical direction, ie deviations of ⁇ 20 ° from the vertical direction possible.
- the drying device 1 is designed as a blowing or air drying device. In this case, the fibrous web F along its Bruciesweges on both sides with dry medium, in particular hot air is applied.
- hot air In contrast to the known from the prior art horizontal air drying devices used in the inventive solution acting on the fibrous web F hot air primarily only the transfer of heat to the fibrous web F and is not due to the vertical guidance of the fibrous web F to stabilize the leadership of the fibrous web F required.
- the application of the dry medium takes place by means of both sides of the fibrous web F along the Bru arrangementsweges spaced to this arranged and thus effective on different fibrous web pages blowing devices 2 nd and 2. Nb with n> 1.
- the blowing devices 2. A and 2. Nb arranged on both sides of the fibrous web F along a web guide path section form a blowing unit 2 .n with n> 1.
- the individual blowing devices 2. na and 2.nb, here 2.1 a to 2. na and 2.1 b to 2.nb are arranged such that the Blowing devices 2. na, 2.nb each one blow unit 2.n limit a running in the vertical direction dry space 3.n with n> 1.
- the blowing units 2.1 to 2.n with the blowing devices 2.1 a to 2. na and 2.1 b to 2.nb limit in the machine direction MD considered here a plurality of extending in the vertical direction dry spaces 3.1 to 3.n. These are arranged in the machine direction MD parallel to each other and adjacent to each other. In these, the leadership of the fibrous web F in the vertical direction, ie from top to bottom or vice versa.
- the dry spaces 3.1 to 3.n take to the vertically running Bahn exitswegabitese on.
- the Bru arrangement of the fibrous web F is thus characterized by a plurality of mutually parallel and extending in the vertical direction Bru arrangementwegabitesen which are coupled via pulleys 6 and 7 together and are arranged within dry spaces 3.n.
- FIG. 2 illustrates, by way of example, a detail from the web guide path in the dry intermediate space 3.1 formed by the blowing unit 2.1 of a fibrous web F to be dried in the drying apparatus 1 according to FIG.
- the individual blowing devices 2.1 a and 2.1 b are spaced on both sides of the web guiding path of the guided in the vertical direction fibrous web F to this and thus in the case of the implementation of the fibrous web F spaced therefrom arranged.
- the blowing devices 2.1 a, 2.1 b act at least indirectly on the surface of the fibrous web F for the purpose of drying. Shown is the advantageous mode of operation with uniform loading of both sides of the fibrous web F by hot air.
- the single beam is at least by an exit angle ⁇ from the respective blowing device 2.1 a, 2.1 b and an impact angle ß on the surface of the fibrous web F characterized.
- the impingement of the fibrous web F preferably takes place in the respective impact area as a function of at least one of the following, the geometry and / or operation of the blowing device 2.1 a, 2.1 b characterizing parameters are thus actively controlled and / or regulated:
- the loading of the fibrous web F with dry medium as a function of the state variables of the dry medium (temperature, pressure), exit velocity and / or volume flow of the dry medium from the blowing device and / or the operation of the drying device 1 at least indirectly characterizing variables, in particular speed of the fibrous web F be set by this.
- a control device 8 is provided. These are used to control the individual blowing devices 2.1 a, 2.1 b to 2. na, 2.nb as a function of predetermined setpoint values for the drying power to be achieved or for these parameters, which characterize them at least indirectly. This is exemplified by the coupling of the outputs of the control device 8 with the control devices of the blowing devices 2.1 a, 2.1 b with output of the required manipulated variables Y2.1 a and Y2.1 b for the blowing devices 2.1 a, 2.1 b clarified.
- FIG. 3 a shows a possibility of the different loading of the individual sides of the fibrous web F with dry medium, which is to be illustrated by arrows of different thicknesses.
- the dry media applied to the oppositely oriented fibrous web sides can be characterized by different state variables, such as different temperatures.
- profiling the dry medium over a desired application area on the fibrous web F Such possibilities are shown in FIGS. 3b to 3d.
- the profiling as a function of the geometry and / or operation of the blowing device 2.1 a, 2.1 b characterizing characteristics and / or the state or operating variables of the dry medium and / or the speed of the fibrous web can be done.
- the profiling can be carried out in particular in the web guiding direction and / or transversely thereto.
- FIG. 3b illustrates the possibility of profiling the dry medium in the guide direction of the fibrous web F by the drying apparatus 1, in particular via a web guide path section in the dry intermediate space 3.1. Shown by means of different arrow strengths is the change of the dry medium profile in the direction of passage of the fibrous web F within a dry space 3.1.
- FIG. 3c illustrates, in a schematically simplified representation, a possibility of forming a blowing device 2.1a with blowing zones divided in the vertical direction. The individual zones are designated by way of example with BZ1 to BZn.
- FIG. 3d shows, in a detail from a view of a blowing device 2.1a in the CD / z plane, an advantageous further development of a design from FIG. 3c with blowing zones also additionally divided in the width direction of the drying device 1.
- the individual zones are designated by way of example with BZ1 .1 to BZ1 .n to BZn.1 to BZn.n where n> 1.
- BZ1 .1 to BZ1 .n to BZn.1 to BZn.n where n> 1.
- These can be realized in a single blowing device 2.1 a in training from a blowing device by subdividing a common interior into individual subspaces and / or by the formation of the blowing device 2.1 a from individual separate blowing devices, such as blow boxes.
- a desired dry medium distribution having the desired properties can be realized via the web guide path section in the dry intermediate space 3.1 and also in the cross machine direction CD, ie width direction.
- the control of the individual zones BZ1 .1 to BZn.n either individually, in groups or together.
- the zone size may be constant or vary in the cross-machine direction CD and / or vertical direction.
- the loading of the fibrous web F with dry medium can be pointwise, linear or planar.
- a, the fibrous web completely covering sheet-like Sought.
- the dry medium can be discharged from the blowing device 2.1a via a plurality of individual nozzles 9.1 to 9.n, as shown by way of example in a view of a section of a blowing device 2.1a with a circular cross section in FIG.
- FIG. 4 illustrates, in a schematized and greatly simplified illustration, a view of the drying device 1 in the MD / z plane, by way of example, of a possible guidance of the fibrous web F without reproducing the blowing devices.
- the fibrous web F is shown here with a broken line. This is introduced into the drying device 1 in an inlet region 4.
- the inlet region 4 is arranged in the illustrated case in the upper direction of the drying device 1 in the vertical direction.
- the fibrous web F learns about the individual arranged in the vertical direction staggered rows deflection rollers 6, 7 a corresponding change in direction and deflection when guided in the vertical direction by the drying device 1 to the outlet 5, which preferably in the lower direction of the drying device. 1 is arranged.
- the fibrous web F undergoes a large number of changes in direction and is thus guided in the machine direction MD in the narrowest region over a multiplicity of parallel web guide path sections. As a result, the residence time within the drying device 1 can be increased considerably.
- the individual, on both sides of the guided by the fibrous web F arranged resulting Bru outsweges and the dry spaces 3.1 to 3.n forming or limiting blowing devices 2.1 a, 2, 1 b to 2. na, 2.nb. It can be seen that the fibrous web F is not immediately guided by taking advantage of the maximum possible height of the drying device 1 in the vertical direction.
- the Bru arrangementswegabitese following the inlet region 4 are characterized by a smaller extent in the vertical direction and thus height than the subsequent Bru arrangementswegabroughe. This can be seen at the different vertical offset of a web guide portion characterizing and above and below the individual dry space arranged deflection rollers 6 and 7.
- the upper deflection rollers 6 in the vertical direction at a height and in the machine direction MD spaced from each other, while the lower guide rollers. 7 are arranged at different heights.
- each case a plurality of dry interstices arranged parallel to one another and extending in the cross machine direction CD and the vertical direction and associated deflection rollers 6, 7 and thus the web guide path sections defined by them are combined to form groups, here I to VI.
- the drying intermediate spaces or individual Bahn entryswegabitese are preferably formed with a constant extension in the vertical direction.
- the height of the individual drying spaces or extension of the Bahn arrangementswegabitese extending through them increases from group to group.
- the fibrous web F is only guided or suspended in the vertical direction in the group V from the point in time at which the fibrous web F has a predefined dry content over the maximum extension of the drying device 1.
- the entire available space starting from the bottom 1 1 is used.
- the inlet 5 in the drying device 1 can be realized by an automated transfer system, in particular a cable transfer.
- a cooling region 26 is preferably provided.
- the fibrous web F is acted upon only with ambient air, which is fed to the blower devices, also not shown on both sides of the fibrous web F along the respective Bahn arrangementswegabites also not shown here in detail, for example.
- the cooling area 26 here comprises the group VI.
- a dry medium supply system 12 is provided. This includes blowers that act on the blower devices 2.1 a, 2.1 b to 2. na, 2.nb with the required dry medium with the required process parameters. These are functionally coupled to the associated blowing devices.
- so-called recirculation fans which are arranged adjacent to the actual drying device 1 and which, in addition to the removal of the moist dry medium, in particular moist air, serve to blow in heated dry medium, in particular air as drying air, are used.
- FIG. 5 illustrates a schematically simplified representation of an advantageous embodiment of the dry-medium guide in a view of the MD / CD level as part of a dry-medium supply system 12.
- the dry-medium is guided in one or more blowing units 2.1 to 2.n in cycles in circuits K, which Part of the dry medium supply system 12 are.
- the single circuit K is free from the supply of fresh air. That is, the air present in the system is guided in the respective circuit K and serves in the flow heat transfer to the fibrous web F. In the return, the exhaust air is heated in order to impose a predefinable temperature before it is again fed to the blowing units 2.1 to 2.n.
- the air flow is performed in the cross machine direction CD. After heat has been transferred from the dry medium, in particular hot air, to the fibrous web F with at least partial evaporation, the moist air stream exits from the respective dry gap 3.1 to 3.n.
- the dry medium is, if possible, in a circuit between the individual blowing devices 2.1 a, 2.1 b, 2.2 a, 2.2 b out, which after leaving the air passed through a heater 14 and by means of a Rezirkulationsgebläses 13 turn the MD in the machine direction adjacent blowing devices of the same or adjacent blowing unit 2.1 to 2.n is supplied.
- a return to the blowing device of the same or adjacent blowing unit upstream or downstream of the machine direction MD takes place.
- the individual recirculation blower 13 required for this purpose and the heating means 14 upstream of the blower devices 2.1a to 2.3b are arranged on both sides of the blower units 2.1, 2.2 in so-called blower towers 27, as shown by way of example in FIG. 6 for the blowing units 2.1a associated recirculation fans 13 illustrates.
- blower towers 27 As shown by way of example in FIG. 6 for the blowing units 2.1a associated recirculation fans 13 illustrates.
- the assignment of at least one recirculation housing to this.
- one or more recirculation fans 13 or a plurality of superposed blow boxes a recirculation fan 13 can be assigned to a blow box.
- the individual recirculation blower 13 are with frequency converters for Control of the operation equipped.
- Each individual fan tower 27 is assigned to one side of the drying device 1 in the cross-machine direction CD, ie width direction, and is in fluid communication with the respective blowing devices 2.1 to 2.n.
- the blower towers 27 include the storage of the blower 13 and each form a unit that can be moved away from the drying device 1 if necessary.
- the individual recirculation fans 13 and the downstream heating devices 14 are preferably arranged such that easy accessibility is provided. Preferably, these are arranged here in tiers and accessible in each floor via inspection doors 19 for operating or inspection personnel.
- the blowing devices as in the vertical direction in each case over the height of a floor and in the cross-machine direction CD extending over these extending blowing devices 2.1 a to 2.nb are formed.
- the tieragenweise arrangement is particularly advantageous. Other designs, however, are also conceivable. However, at least one or more recirculation fans or recirculation motors 13 should be accessible per floor.
- the supply of fresh air through the dry medium supply system 12 is shown in a simplified schematic representation on the CD / Z plane of the drying device 1 in FIG. 7. While the circuits K are guided in the cross machine direction CD, the fresh air supply is at an angle with respect to the flow direction, here perpendicular to the air duct in the circuits K.
- FIG. 7 shows an exhaust air discharge 28 and a fresh air supply 29. Both are fluidically decoupled from one another, ie none occurs Mixing of exhaust air AL and supply air ZL or fresh air.
- the exhaust air AL is in the vertical direction above from the individual blowing units 2.1 to 2.n, ie above the last blower, especially last row blow boxes a single blowing unit 2.1 to 2.n subtracted, while the supply air ZL from below the individual blowing units 2.1 to 2 .n, ie in the vertical direction the lower rows blow boxes is supplied.
- the feed takes place on both sides of the drying device 1, preferably via the fan towers 27.
- they have at least one feed opening in the lower Area, preferably in the bottom of the first floor and at least one exit opening in the upper vertical region, preferably the upper ear or a side wall of the upper floor of a blower tower 27.
- the coupling is preferably carried out via at least one heat exchanger 30, which may be designed in various ways and over which the two media are conducted in the same or countercurrent.
- the exhaust air AL is led to a wall section in the guide path for the supply air ZL.
- the individual deflection rollers 6, 7 and the blowing devices 2.1 a, 2.1 b to 2. na, 2.nb of the individual blowing units 2.1 to 2.n and / or the recirculation blower 13 and heaters 14 and the blower towers 27 each at least indirectly at one Frame 15 stored.
- the individual blowing devices 2.1 a to 2.nb are each arranged in blast towers in which blow boxes which extend over the machine width are arranged one above the other in the vertical direction.
- the frame 15 forms for this a support structure of carriers.
- the support structure describes in the machine direction MD arranged parallel to each other and extending in the vertical direction spaces 16 for receiving the individual blowing units 2.1 to 2.n.
- CD platforms are designed to ensure accessibility to the dry spaces.
- the individual platforms on the driver and drive side of the drying device 1 are each combined in a platform part 17 and anchored in the basic structure of the frame 15.
- the recirculation fan 13 and heaters 14 can be directly in Be mounted frame 15.
- the single fan tower 27 is formed of these and frame parts of the frame 15.
- the support structure for recirculation blower 13 and heating device 14 is preferably formed by a separate frame part 31, as shown in FIG. 6, which is coupled to the frame 15 or can preferably be detachably combined to form a structural unit.
- FIGS. 10a to 10c show a particularly advantageous embodiment of the drying apparatus 1 with the possibility of at least temporary enlargement of the individual drying spaces 3.1 to 3.n.
- the individual blowing devices 2.1 a, 2.1 b to 2. na, 2.nb are mounted on the frame 15 such that the respectively formed between these dry space 3.1 to 3.n can be varied in terms of its extension in the machine direction MD.
- a storage unit 20 This comprises a rotatably mounted by means of a rotary joint 22 on the frame 15 rocker arm 21, on which in each case at a distance a from the pivot point two adjacent blowing devices one or two different blower units are articulated.
- the distance a from the fulcrum is the same for both blowing devices.
- the adjacently arranged blowing devices of different blowing units 2.1 to 2.n are mounted on the rocker arm 21.
- the blowing devices 2.1b and 2.2a, 2.2b and 2.3a, 2.3b and 2.4a, 2.4b and 2.a are mounted on a rocker arm 21 so as to be articulated to the pivot point thereof.
- the storage can be done depending on the design of the rocker arm 21 with additional offset in the vertical direction to the pivot point or free of this.
- the rocker arm 21 is triangular or trapezoidal.
- a force application surface 25 is provided, on which, for example, a cylinder / piston unit for the purpose of displacement / tilting is effective.
- the tilting movement then leads to a superimposed horizontal and vertical movement of the tilting lever 21 via joints 23, 24 mounted blowing devices 2.1 b and 2.2a, 2.2b and 2.3a, 2.3b and 2.4a, 2.4b and 2. na two adjacent blowing units 2.1 to 2.n in the opposite direction while reducing their distance from each other, whereby the dry spaces 3.1 to 3.n be increased on the other side.
- the design of the bearing unit 20 is reproduced in detail by way of example in FIG. 10b.
- FIG. 10a shows the drying device 1 in the normal operating state without increasing the dry spaces 3.1 to 3.n.
- Figure 10c illustrates the drying device 1 with enlarged dry spaces 3.1 to 3.n by tilting the individual blowing devices 2.1 b and 2.2a, 2.2b and 2.3a, 2.3b and 2.4a, 2.4b and 2. na and thus blast towers for the purpose of Carry out cleaning operations. Visible here is the movement of each of a blast tower in the vertical direction upwards and coupled to this due to the coupling via the rocker arm 21 movement of the adjacent Blasturmes associated with this down to reduce their distance from each other, whereby the respective adjacent dry space is increased. The movement can be done individually or in groups.
- the movement can be realized mechanically, hydraulically, electrically, electronically or a combination thereof.
- FIG. 10 c illustrates
- the movement can be individually or in groups.
- the movement can be realized mechanically, hydraulically, electrically, electronically or a combination thereof.
- the movement can be realized mechanically, hydraulically, electrically, electronically or a combination thereof.
- Figure 10c all blowing units 2.1 to 2.n stored so that they are operated together, that is, simultaneously and positively coupled.
- Recirculation fan is again performed in the circuit K.
- FIG. 12 illustrates, in a schematized and highly simplified illustration, a design with at least one additional device in the form of a stripping device, here two stripping devices 32.1 and 32.2 for knocking off the fibrous web F in the case of a web break.
- the teeing-off device 32.1, 32.2 can be embodied in various ways.
- the individual stripping device 32.1, 32.2 is mounted, for example, on the frame 15 and comprises a carrier 33.1, 33.2, which is equipped with stripping elements, in particular stripping blades 34.1, 34.2.
- the individual knock-off devices 32.1, 32.2 are movable relative to the individual deflection devices 6, in particular displaceably mounted, and become effective in the region of these on the fibrous web F.
- the individual punching device 32.1, 32.2 is designed and arranged to be suitable to perform a knocking off or separating the fibrous web F at least over a partial region of the extension in the cross-machine direction, preferably over the entire extent in the cross-machine direction CD.
- the teeing-off elements, in particular teeing-off knives 34.1, 34.2, are for this purpose, for example, slidably mounted in this direction over at least a partial area of the carrier, preferably in a machine cross-straightening carrier 33.1, 33.2. Further, the storage can be displaced relative to the carrier 33.1, 33.2 perpendicular to the direction of extension in Maschinenquennchtung or pivotable on this.
- the beating off of the fibrous web F takes place in the upper region of the drying device, in particular in the region of the upper deflection rollers 6. Shown in FIG. 12, the drying device 1 is in the operating position or also when decommissioning.
- the teeing-off devices 32.1 and 32.2 are in their functional position I.
- This functional position I which corresponds to a position outside a tee position, is characterized in the illustrated case by a positioning or storage of the teeing-off devices 32.1, 32.2 in the machine direction MD before or behind the deflection rollers 6.
- the teeing-off devices 32.1, 32.2 are each moved individually or together to the desired teeing-off position.
- the movement of the individual chopping device 32.1, 32.2 either be controlled separately or both are coupled, the movements can be done sequentially or simultaneously.
- the movement takes place as a function of the starting position of the stripping devices 32.1, 32.2, in the illustrated case by way of example by a movement of the carriers 33.1, 33.2 in the MD direction and also in the vertical direction. It is also conceivable embodiment not shown here with positioning of the stripping devices 32.1, 32.2 in the functional position Fl only in the vertical direction with offset to the actual tee position.
- the teeing-off elements 34.1, 34.2 are then brought into the teeing-off position by appropriate positioning and mobility relative to the carrier 33.1, 33.2 and moved in the cross-machine direction, either by movement of the carrier or by movement relative to the carrier when positioning the carrier in a fixed position.
- FIGS. 13a to 13e illustrate possible positions of the
- FIG. 13a illustrates the drying device 1 with the arrangement of FIG
- Blowers 2.1 a to 2.nb in the cleaning position are under magnification of
- FIG. 13b illustrates the method of the knock-off devices 32.1, 32.1 in the event of a fault in the functional position F1. In this case, both are effective on the fibrous web F in the region of the first two deflection rollers 6.
- the fibrous web F falls in the dry spaces 3.1, 3.2 down and can in a
- Machine direction MD are characterized in each case to the next or after next deflection roller 6, so that the fibrous web F in case of failure
- the chopping device 32.1, 32.2 is thereby moved in the drying device 1 in such a way that it becomes effective at the individual adjacent guide regions.
- the severed web area is shown with a thicker and crimped line. The respective previous position of the individual
- Demolition device 32.1, 32.2 is illustrated by a broken line. The movements of these are indicated by arrows. In FIG. 13c, the stripping device 32.1 is shown moved or moved behind the stripping device 32.2 in the machine direction MD.
- Functional position of the two stripping devices 32.1, 32.2 is designated by FIII.
- the stripping device 32.2 is moved in the functional position FIV behind the stripping device 32.1 in the machine direction MD.
- Functional position FV is characterized by the renewed offset of the chopper 32.1 in the machine direction MD behind the chopper 32.2. It can be seen that the knocking on successively following
- Web guide sections in the area of the deflection takes place.
- the actuation or positioning of the individual stripping devices 32.1, 32.2 takes place here alternately.
- the chopping device 32.1 to 32.n can be designed with rotatable knives or water jet.
- the rotatable blades or the water jet are, for example, movable in the cross-machine direction, in particular designed to be movable.
- FIGS. 13a to 13e illustrate a particularly advantageous arrangement of the knock-off device in an upper cut-off position. It is also conceivable arrangement not shown here within the dry spaces as well as in the region of the lower deflection rollers in the vertical direction. 7
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Fiber Materials (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011006698A DE102011006698A1 (en) | 2011-04-04 | 2011-04-04 | Method for drying a fibrous web in a drying device and drying device |
PCT/EP2012/055483 WO2012136533A1 (en) | 2011-04-04 | 2012-03-28 | Method for drying a fibrous web in a drying device, and drying device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2694727A1 true EP2694727A1 (en) | 2014-02-12 |
EP2694727B1 EP2694727B1 (en) | 2016-05-18 |
Family
ID=45937300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713055.7A Active EP2694727B1 (en) | 2011-04-04 | 2012-03-28 | Method for drying a fibrous web in a drying device, and drying device |
Country Status (7)
Country | Link |
---|---|
US (1) | US20140060764A1 (en) |
EP (1) | EP2694727B1 (en) |
CN (1) | CN103597140B (en) |
BR (1) | BR112013025780B1 (en) |
CL (1) | CL2013002842A1 (en) |
DE (1) | DE102011006698A1 (en) |
WO (1) | WO2012136533A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015086289A1 (en) | 2013-12-13 | 2015-06-18 | Voith Patent Gmbh | Method and device for drying a fibrous material web |
WO2015086288A1 (en) | 2013-12-13 | 2015-06-18 | Voith Patent Gmbh | Device for producing a fibrous web |
WO2015086287A1 (en) * | 2013-12-13 | 2015-06-18 | Voith Patent Gmbh | Method and device for transfer of a fibrous web |
CN104764310A (en) * | 2015-04-03 | 2015-07-08 | 苏州科明纺织有限公司 | Hot wind type sizing drying device |
DE202015106039U1 (en) | 2015-11-10 | 2017-02-13 | Autefa Solutions Germany Gmbh | treatment facility |
CN105444546A (en) * | 2015-12-21 | 2016-03-30 | 浙江精功科技股份有限公司 | Non-contact tow drying double-side air blowing device |
CN111886187B (en) * | 2018-03-29 | 2023-01-06 | 特种东海制纸株式会社 | Interleaving paper for glass plate and method for manufacturing the same |
CN111886186B (en) * | 2018-03-29 | 2022-08-12 | 特种东海制纸株式会社 | Interleaving paper for glass plate and method for manufacturing the same |
WO2020162880A1 (en) * | 2019-02-05 | 2020-08-13 | Hewlett-Packard Development Company, L.P. | Side exits for multi-pass dryers |
FI12433U1 (en) * | 2019-05-16 | 2019-07-15 | Valmet Technologies Oy | Arrangement for an air dryer of a fibre web machine |
CN113203272A (en) * | 2020-01-31 | 2021-08-03 | Ykk株式会社 | Drying machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3634948A (en) * | 1970-08-20 | 1972-01-18 | Tadashi Kobayashi | Drying apparatus for papermaking |
DE3615152A1 (en) * | 1986-05-05 | 1987-11-12 | Pierkes Heinz Willi | Dry end of a papermachine |
FI92421B (en) * | 1992-03-19 | 1994-07-29 | Valmet Paper Machinery Inc | Method for Air Drying of Substances, Nozzle Blower for an Air Dryer and Cellulose Dryer |
SE9500196D0 (en) * | 1995-01-20 | 1995-01-20 | Sture Kristroem | drying device |
FI104194B (en) | 1998-04-28 | 1999-11-30 | Valmet Corp | Pulp drying section, pulp drying method and pulp drying blade |
FI119153B (en) * | 2006-11-14 | 2008-08-15 | Metso Paper Inc | End portion of an air dryer, air dryer, procedure in the end portion of an air dryer and use of a fan |
-
2011
- 2011-04-04 DE DE102011006698A patent/DE102011006698A1/en not_active Withdrawn
-
2012
- 2012-03-28 BR BR112013025780-6A patent/BR112013025780B1/en active IP Right Grant
- 2012-03-28 CN CN201280027409.1A patent/CN103597140B/en active Active
- 2012-03-28 WO PCT/EP2012/055483 patent/WO2012136533A1/en active Application Filing
- 2012-03-28 EP EP12713055.7A patent/EP2694727B1/en active Active
-
2013
- 2013-10-03 CL CL2013002842A patent/CL2013002842A1/en unknown
- 2013-10-04 US US14/046,105 patent/US20140060764A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2012136533A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102011006698A1 (en) | 2012-10-04 |
CN103597140B (en) | 2015-12-09 |
WO2012136533A1 (en) | 2012-10-11 |
EP2694727B1 (en) | 2016-05-18 |
CL2013002842A1 (en) | 2014-04-11 |
BR112013025780A2 (en) | 2016-12-20 |
US20140060764A1 (en) | 2014-03-06 |
BR112013025780B1 (en) | 2021-02-23 |
CN103597140A (en) | 2014-02-19 |
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