EP4089354A1 - Dispositif et procédé de séchage d'une bande de produit textile - Google Patents

Dispositif et procédé de séchage d'une bande de produit textile Download PDF

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Publication number
EP4089354A1
EP4089354A1 EP22171180.7A EP22171180A EP4089354A1 EP 4089354 A1 EP4089354 A1 EP 4089354A1 EP 22171180 A EP22171180 A EP 22171180A EP 4089354 A1 EP4089354 A1 EP 4089354A1
Authority
EP
European Patent Office
Prior art keywords
dryer
drum
web
air
hot 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.)
Withdrawn
Application number
EP22171180.7A
Other languages
German (de)
English (en)
Inventor
Thomas Weigert
Kai PÖHLER
Stephan Backes
Matthias Dorlächter
Markus Nini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Truetzschler Group SE
Original Assignee
Voith Patent GmbH
Truetzschler Group SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Truetzschler Group SE filed Critical Voith Patent GmbH
Publication of EP4089354A1 publication Critical patent/EP4089354A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • 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
    • F26B13/103—Supporting materials without tension, e.g. on or between foraminous belts with mechanical supporting means, e.g. belts, rollers, and fluid impingement arrangement having a displacing effect on the materials
    • 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
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/16—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning perforated in combination with hot air blowing or suction devices, e.g. sieve drum dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun

Definitions

  • the present invention relates to a device and a method for drying a textile web with a first radiation dryer and a subsequent convection dryer with a drying chamber in which at least two air-permeable drums are rotatably arranged and the textile web can be guided at least over a partial circumference of each drum and heated drying air can flow through.
  • nonwovens products the trend is away from plastic-based fibers towards cellulose-based fibers, which are processed using the wetlaid process, among other things. Since the fibers are deposited wet on a forming fabric, a higher dryer output is required, which will significantly increase the manufacturing and operating costs with an additional drum in a series dryer. If a manufacturer of nonwoven products wants to follow this trend and convert their production, they have to retrofit their dryer with an additional drum or operate with a higher heating or fan output. Both variants are expensive and technically only make sense to a limited extent, since a higher heating output is not possible for every fiber mixture and/or the desired residual moisture in the material web cannot be maintained.
  • the EP 2056053 B1 discloses a dryer arrangement for drying a material web, for example a paper web.
  • the dryer arrangement has an air dryer, which is preceded by a radiation dryer.
  • the air dryer is operated almost exclusively by the exhaust air from the radiation dryer.
  • a heating device or a burner is only optionally arranged to generate additional heating air for the air dryer.
  • a radiation dryer is combined with a flotation dryer.
  • a web runs into the radiation dryer and is exposed to infrared rays and at the same time the temperature is cooled down.
  • the cooling air used in the radiation dryer flows with the web through an inlet opening into the flotation dryer.
  • the object of the invention relates to the energy-efficient development of a device for drying a textile web. Furthermore, the invention relates to a method for the energy-efficient drying of a textile web.
  • the invention includes the technical teaching that, in order to dry a textile material web, it is first fed to a radiation dryer and then to a subsequent convection dryer.
  • the convection dryer has a drying chamber in which at least two air-permeable drums are rotatably arranged, the textile web being able to be guided over at least a partial circumference of each drum and heated air to flow through it.
  • the essence of the invention is the use of the air heated in the radiation dryer as hot air for the first drum, with the material web being additionally or exclusively dried with this hot air as it is wrapped around the first drum. It is thus possible to switch off the burner or the heating device for the first drum completely, or to uninstall it or not to deliver it at all in the case of permanent operation in the processing of cellulose fibers.
  • the arrangement of the radiation dryer before the convection dryer can be designed to save space by combining or integrating the radiation dryer with the infeed belt of the material web into the convection dryer.
  • the first drum in each case can be operated with a high proportion or exclusively with the waste heat from the radiation dryer, so that it cannot be operated with additional or only little additional heating power.
  • the combination of radiation dryer and convection dryer means that the first drum of the convection dryer achieves a higher evaporation capacity, since the water can be more easily drawn out of the capillaries of the fibers with the lower viscosity and surface tension.
  • the invention advantageously uses the possibility that the heating of the surface of the material web by the radiation dryer reduces not only the evaporation of the water but also the viscosity and surface tension of the water in the material web. This increases the drying capacity of the downstream dryer, since the reduced viscosity and surface tension mean that the moisture in the web can be more easily absorbed by the hot air supplied to the drums.
  • the reduction in the viscosity and surface tension of the water in the web means that the water is more easily blown out of the capillaries of the fibers, particularly in the area of the first drum, which follows the radiation dryer.
  • the radiant energy simultaneously heats the air in the radiant dryer, which is drawn off via a line and supplied as external hot air via the flame tube, not shown, to the first drum.
  • the amount of air supplied is so sufficient that the first drum does not require any further heated hot air from an electric or gas burner.
  • the invention offers a cost-effective solution for retrofitting, particularly in the event of a product change due to the increased use of cellulose-based fibers in existing systems.
  • the air heated in the radiation dryer is at least partially also fed to the second drum as hot air by means of a line. This means that additional hot air from the radiation dryer can be used for the second drum, for example if the radiation dryer has more modules than are required for drying material webs with a low initial moisture content.
  • the second drum preferably has a further device for generating hot air, for example as a gas burner or electric heater. This can compensate for any missing hot air that can no longer be provided by the radiation dryer.
  • a further device for generating hot air for example as a gas burner or electric heater. This can compensate for any missing hot air that can no longer be provided by the radiation dryer.
  • the hot air from the radiation dryer is fed to the flame tube of the drum, mixing with fresh air is not necessary because the proportion of moisture in the hot air of the radiation dryer is low. Since the hot air from the radiation dryer can have a higher temperature than the hot air from the convection dryer, the temperature of the hot air from the radiation dryer is also reduced indirectly via the feed into the flame tube.
  • the web of material 2 to be dried here can consist of a fibrous web produced in the wetlaid process, which has been reinforced or bonded alone or with one or more layers of any fleece.
  • the material web 2 can also consist of a normal carded fleece, continuous fibers or a meltblown or airlaid, which are reinforced or connected alone or with one or more layers of any fibers or a fleece.
  • a web of material 2 runs over a circulating belt 3 through a radiation dryer 4, which in this exemplary embodiment can consist of three modules 6a, 6b, 6c of an infrared radiation dryer arranged one behind the other.
  • the number of modules can be arbitrary and can be between one and fifteen, for example.
  • the modules 6a, 6b, 6c are arranged in a housing 5 which is closed at the top and which is designed to draw off the air heated by the radiant heat of the modules 6a-6c via the line 7.
  • the web 2 runs through the radiation dryer 4 and is introduced into the housing 11 of a subsequent dryer 10 via an infeed roller 12, which can also serve as a circulating roller for the circulating belt 3.
  • This dryer 10 is designed as a convection dryer and has at least two drums arranged one behind the other in its drying chamber.
  • four drums 13a - 13d are arranged one behind the other in a row, around which the material web 2 is at least partially wrapped.
  • Each drum 13a - 13d is assigned its own device for generating hot air. This can be designed as a supply line for the supply of externally heated air, or as an electric heater or gas burner.
  • Each drum 13a - 13d has also has its own device for extracting the moisture-laden air, which can be arranged as a fan on the front of the drums 13a - 13d.
  • the material web 2 enters the housing 11 of the dryer 10 and wraps around the first drum 13a from below.
  • the part of the drum 13a which is not wrapped around by the material web 2 can be separated from the drying room by means of a partition 14a in terms of ventilation.
  • the web 2 then runs over the upper circumference of the second drum 13b, then over the lower circumference of the third drum 13c and finally over the upper circumference of the fourth drum 13d. From there, the web 2 is transferred via an outlet roller 16 to another circulating belt 17 for further processing or to a winder.
  • All drums 13a - 13d have the above-described partition 14a - 14d in their interior space in the peripheral area which is not wrapped around by the material web 2 .
  • the drums 13a - 13d can be separated from one another in the dryer room by partitions, in which case there is free passage only in the area where the material web 2 runs.
  • modules 6a - 6c of an infrared dryer are arranged in the housing 5 of the radiation dryer 4 . They heat the surface of the web 2, which reduces not only the evaporation of the water but also the viscosity and surface tension of the water in the web 12. This increases the drying performance of the downstream dryer 10, since the reduced viscosity and surface tension mean that the moisture in the material web 2 can be more easily absorbed by the hot air supplied to the drums 13a-13b.
  • the reduction in the viscosity and surface tension of the water in the web of material causes the water to be blown out of the capillaries of the fibers more easily, particularly in the region of the first drum 13a, which follows the radiation dryer 4.
  • the air in the radiation dryer 4 is simultaneously heated with the radiant energy, which air is drawn off via the line 7 and is supplied as external hot air via the flame tube (not shown) to the first drum 13a.
  • the amount of air supplied is so sufficient that the first drum 13a does not require any further hot air heated by an electric or gas burner.
  • the air drawn off via the line 7 is preferably fed to the flame tube of the first drum 13a of the dryer 10 .
  • This has the advantage that the air, which has a temperature of 250° C., for example, cools down to 140° C. to 150° C. via this supply and is not supplied directly as hot air. Damage to the fibers can thus be avoided. Since the air drawn off via line 7 of the radiation dryer 4 has only a small load Has moisture, mixing with fresh air, for example from an intermediate chamber, not shown, is not necessary.
  • figure 2 differs from figure 1 by a convection dryer 10 with only three drums 13a, 13b, 13c.
  • the air heated by the radiant heat of the radiant dryer 4 is drawn off via the line 7 and fed to the first drum 13a as external hot air.
  • the first drum 13a has no additional heat source in the form of a burner, for example, but is operated exclusively by the waste heat from the radiation dryer 4 .
  • the line 7 is also connected to the flame tube of the second drum 13b, so that excess heated air from the radiation dryer 4 can also be fed to the second drum 13b.
  • a regulating valve 18 is arranged in the duct 7 and adapted to regulate the amount of heated air supplied to the second drum 13b.
  • An air volume regulator not shown in the line 7, between the regulating valve 18 and the drum 13c is designed to send a signal to a controller of the device, so that it can simultaneously control the heat output of the burner 15b.
  • the embodiment of figure 2 also has the advantage of the embodiment of figure 1 on, namely to increase the evaporation capacity of the first drum 13a by reducing the viscosity and the surface tension of the water.
  • excess hot air from the radiation dryer 4 can be used in the second drum 13b to reduce the heating capacity of the burner 15b.
  • This exemplary embodiment is useful for drying webs of material with a lower initial moisture content, in which, for example, no fibers from the wetlaid process are processed.
  • a convection dryer with five drums without an upstream radiation dryer has a gas input power of 5,187 kW. This energy is divided into the heating of the dryer and the web (12%), the evaporation energy (57%) and waste heat including radiation and convection losses (31%). The waste heat with the radiation and convection losses have an absolute value of 1,608 kW at the specified gas input heat.
  • a total gas input power of 4,572 kW is used.
  • 2,850 kW is routed to the radiation dryer and 1,722 kW to the convection dryer.
  • the heating energy of the radiation dryer is also 12% and the evaporation energy is 18% of the total gas input power of 4,572 kW.
  • the losses of the radiation dryer through convection and radiation are around 6%.
  • the waste heat from the radiation dryer amounting to 1,250 kW, can be used to heat up the convection dryer. According to the first example, this heat output is supplied exclusively to the first drum 13a, which can therefore be operated without a gas burner.
  • the additional heating capacity of 1,722 kW is fed to the following three drums 13b -13d via the burners 15b to 15d, which require less energy because the reduction in the viscosity of the water and the surface tension means that a higher proportion of moisture is already present in the first drum 13a of the Convection dryer web 2 can be withdrawn.
  • the first drum which is directly downstream of the radiation dryers, has a significantly higher evaporation capacity than in a conventional dryer with five drums without an upstream radiation dryer.
  • the combination of the upstream radiation dryer with a smaller convection dryer also has an effect on the second to fourth drums that follow, as their convection output is also lower because the first drum already has a higher proportion of moisture in the web withdrawn.
  • the waste heat from the convection dryer is now only 1,212 kW, i.e. around 26.5% of the total gas input power of 4,572 kW.
  • the drums in both experiments have the same diameter of 2,800 mm and the same working width of 3,600 mm.
  • the material web with 147 g/m 2 has the same fiber mixture 100% CV with 1.7 dtex and a fiber length of 40 mm with the same entry moisture content of 66% and the same exit moisture content of 4.5%.
  • the calculated thermal efficiency increased from 69.2% to 80.5%.
  • a convection dryer 10 with three drums 13a, 13b, 13c without an upstream radiation dryer has heated air at 140° C. in all three drums for drying the material web.
  • the first drum 13a has a gas consumption of 23.18 m 3 /h
  • the second drum 13b a gas consumption of 23.02 m 3 /h
  • the third drum 13c a gas consumption of 25.09 m 3 /h.
  • the web 2 is dried without an upstream radiation dryer 4 .
  • the drum suction has a production capacity of 45.8 kW at a vacuum of 444 mbar.
  • the drums have a diameter of 2,800 mm and a working width of 3,600 mm.
  • the Material web with 50g/m 2 consists of 100% CV with 1.7 dtex and a fiber length of 40 mm with an input moisture content of 57% and an output moisture content of 5.1%.
  • the web runs through the dryer at a speed of 130m/min.
  • a key figure of 1.43 kW/kg (fibers or web) is determined for drying the web.
  • a convection dryer 10 with three drums 13a, 13b, 13c is preceded by a radiation dryer 4 with three modules 6a, 6b, 6c.
  • the radiation dryer 4 pre-dries the web 2 with a total output of 125 kW, the heated exhaust air, which is introduced through the line 7 into the convection dryer, being loaded with 10% water and having a temperature of 400°C.
  • the volume flow supplied to the convection dryer 10 via the line 7 has a heating capacity of 55.8 kW.
  • the first drum 13a is additionally heated with a gas burner, the gas consumption of which is 18.71 m 3 /h.
  • the second drum 13b has a gas consumption of 18.95 m 3 /h at the same temperature, and the third drum 13c has a gas consumption of 20.72 m 3 /h at the same temperature.
  • the drum suction has a production capacity of 47.2 kW at a vacuum of 440 mbar.
  • the drums have a diameter of 2,800 mm and a working width of 3,600 mm.
  • the material web with 50g/m 2 consists of 100% CV with 1.7 dtex and a fiber length of 40 mm with an input moisture content of 57% and an output moisture content of 5.3%.
  • the web runs through the dryer at a speed of 130m/min.
  • a key figure of 1.33 kW/kg (fibers or web) is determined for drying the web.
  • the total energy consumption can be reduced since the evaporation capacity in the dryer increases with a lower energy due to the reduced surface tension of the water.
  • the exemplary embodiments 1 and 2 relate to the comparison in a convection dryer 10 in which, when using the radiation dryer 4, the heating element of the first drum 13a is not present or has been switched off.
  • the exemplary embodiments 3 and 4 relate to the comparison with a convection dryer 10 in which the hot air in the convection dryer is enriched by the exhaust air from the line 7 through the use of the radiation dryer 4 .
  • the existing burners of all drums 13a, 13b, 13c continued to be used. Overall, the temperature level could be reduced so that the energy consumption was reduced with almost the same incoming and outgoing moisture content of the web.
  • the advantage of the device according to the invention lies not only in the lower energy consumption but also in the lower investment, since an in-line dryer with five drums is more expensive than an in-line dryer with four drums and an upstream radiation dryer.
  • the radiation dryers can be switched on from 4 to 15 modules, for example.
  • the positive effect of reducing the viscosity of the water and the surface tension through the radiation dryer also comes into play with fewer modules, so that the first drum of the convection dryer in particular can work with a higher evaporation capacity.
  • the same inventive effect also results from a combination of several modules of infrared dryers with a convection dryer with, for example, two or three drums.
  • the first drum in each case can be operated with a high proportion or exclusively with the waste heat from the radiation dryer, so that it cannot be operated with additional or only little additional heating power.
  • the combination of radiation dryer and convection dryer means that the first drum of the convection dryer achieves a higher evaporation capacity, since the water can be more easily drawn out of the capillaries of the fibers with the lower viscosity and surface tension.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Textile Engineering (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP22171180.7A 2021-05-11 2022-05-02 Dispositif et procédé de séchage d'une bande de produit textile Withdrawn EP4089354A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021112295.3A DE102021112295A1 (de) 2021-05-11 2021-05-11 Vorrichtung und Verfahren zum Trocknen einer textilen Warenbahn

Publications (1)

Publication Number Publication Date
EP4089354A1 true EP4089354A1 (fr) 2022-11-16

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EP22171180.7A Withdrawn EP4089354A1 (fr) 2021-05-11 2022-05-02 Dispositif et procédé de séchage d'une bande de produit textile

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EP (1) EP4089354A1 (fr)
DE (1) DE102021112295A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487739A (fr) * 1966-07-25 1967-07-07 Vepa Ag Procédé et installation de séchage de matières susceptibles d'être soumises à des efforts de traction
DE1952285A1 (de) * 1969-10-17 1971-04-29 Vepa Ag Vorrichtung zum Trocknen von bahnfoermigen Guetern mit einer schachtartigen Trocknungskammer
WO1988009845A1 (fr) * 1987-06-04 1988-12-15 Valmet Paper Machinery Inc. Procede de sechage d'une bande de papier ou similaire
DE3910898B4 (de) 1988-04-25 2005-11-17 Metso Paper, Inc. Verfahren zum Trocknen einer sich bewegenden Bahn und Kombinationstrockner
DE102007051962A1 (de) * 2007-10-31 2009-05-07 Voith Patent Gmbh Materialbahntrockneranordnung
EP3249326B1 (fr) 2016-05-23 2019-06-05 Trützschler GmbH & Co. KG Dispositif de séchoir pour une bande textile comprenant un dispositif amélioré destiné à apporter de la chaleur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487739A (fr) * 1966-07-25 1967-07-07 Vepa Ag Procédé et installation de séchage de matières susceptibles d'être soumises à des efforts de traction
DE1952285A1 (de) * 1969-10-17 1971-04-29 Vepa Ag Vorrichtung zum Trocknen von bahnfoermigen Guetern mit einer schachtartigen Trocknungskammer
WO1988009845A1 (fr) * 1987-06-04 1988-12-15 Valmet Paper Machinery Inc. Procede de sechage d'une bande de papier ou similaire
DE3910898B4 (de) 1988-04-25 2005-11-17 Metso Paper, Inc. Verfahren zum Trocknen einer sich bewegenden Bahn und Kombinationstrockner
DE102007051962A1 (de) * 2007-10-31 2009-05-07 Voith Patent Gmbh Materialbahntrockneranordnung
EP2056053B1 (fr) 2007-10-31 2011-09-07 Voith Patent GmbH Agencement de séchoir pour bande de matériau
EP3249326B1 (fr) 2016-05-23 2019-06-05 Trützschler GmbH & Co. KG Dispositif de séchoir pour une bande textile comprenant un dispositif amélioré destiné à apporter de la chaleur

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