EP2166298A2 - Agencement de séchoir pour bande de matériau - Google Patents

Agencement de séchoir pour bande de matériau Download PDF

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Publication number
EP2166298A2
EP2166298A2 EP09170441A EP09170441A EP2166298A2 EP 2166298 A2 EP2166298 A2 EP 2166298A2 EP 09170441 A EP09170441 A EP 09170441A EP 09170441 A EP09170441 A EP 09170441A EP 2166298 A2 EP2166298 A2 EP 2166298A2
Authority
EP
European Patent Office
Prior art keywords
air
dryer
radiation
material web
duct
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
Application number
EP09170441A
Other languages
German (de)
English (en)
Other versions
EP2166298A3 (fr
EP2166298B1 (fr
Inventor
Richard Dr. Aust
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
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2166298A2 publication Critical patent/EP2166298A2/fr
Publication of EP2166298A3 publication Critical patent/EP2166298A3/fr
Application granted granted Critical
Publication of EP2166298B1 publication Critical patent/EP2166298B1/fr
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Classifications

    • 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
    • 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
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements

Definitions

  • the invention relates to a web dryer arrangement with at least one radiation dryer and at least one air dryer, wherein the air dryer in a first air duct system at least a first air supply line and a first exhaust duct, which is connected to the at least one first air supply line of the first air duct system of the air dryer, and wherein the radiation dryer a second air duct system comprising at least one second exhaust duct, which is connected to the at least one first supply air duct of the first air duct system of the air dryer.
  • a web dryer assembly of this type is used, for example, in the manufacture of a paper web to dry it.
  • the radiation dryer has a relatively high power density, i. he can transfer a relatively large amount of heat to the web, so that the water contained therein can evaporate well. Although the air dryer transmits a smaller amount of heat to the web. But he is able to support the web contact.
  • a web dryer arrangement of the type mentioned is, for example WO 2005/085729 known.
  • the radiation dryer is connected upstream of the air dryer.
  • Several such arrangements of radiation dryer and air dryer can be arranged one behind the other. Heated air from the radiation dryer is collected by the air dryer and optionally blown after reheating on the web.
  • EP 1 169 511 A similar embodiment is made EP 1 169 511 known. Here, too, heated air from the radiation dryer reaches a capture device of the Air dryer, where it is taken up, circulated and blown back onto the web.
  • Out DE 39 10 898 B4 is a combination dryer with a radiation dryer and an air dryer is known in which the radiation dryer is heated with air, which is branched off from a feed stream for the air dryer. Heated air from the radiation dryer is fed to the housing of the air dryer, sucked there, mixed with fresh air and circulated again, the combination of already heated air and fresh air is heated by a heater again.
  • the radiation dryer to assign a second air duct system with supply air and exhaust air, both air ducts each with a connection of supply air and exhaust air to provide and connect both air ducts only in the region of their respective exhaust air.
  • the object is achieved in that an air mass flow (m 1 ) in the at least one first air supply line of the first air duct system of the air dryer during operation of the web dryer assembly 3 to 10 times as large as an air mass flow (m 2 ) in the at least one second exhaust duct of the second air duct system of the radiation dryer.
  • the preferred ratio is even more accurate from experiments to a value between 4 and 8.
  • a web dryer assembly 1 according to FIG. 1 is used to dry a material web 2, which passes in a marked by an arrow 3 direction of the web dryer assembly 1.
  • the material web 2 first passes through a radiation dryer 4, which is designed as an infrared dryer and then an air dryer. 5
  • the radiation dryer 4 is supplied via an inlet 6 air. If it is an electrically powered radiation dryer, then this dryer requires cooling air. If it is a gas-powered radiation dryer, then this radiation dryer additionally requires combustion air. Because it is important to the invention, it is in Fig.1 to a cooling air supply, which ensures within the radiation dryer 4 that cables, gaskets o. ⁇ . Not excessively stressed by heat. In this case, a motor 7 drives a fan 8.
  • the radiation dryer 4 on the one hand emits radiant heat to the material web 2, on the other hand it heats the registered with the material web Air.
  • the heated air is removed together with the evaporated water from the material web and - in gas-heated infrared radiators - the combustion exhaust gases via an exhaust duct 9, which is connected to at least one suction and / or recirculation duct 30, the radiation dryer 4.
  • a portion of the exhaust air for example 15 to 30%, in particular about 20%, can be supplied as air mass flow m 5 via a connection 10 to a supply air line 11.
  • a fresh air connection 12 is provided in the connection 10.
  • a conveying device having a motor 13 and a fan 14 conveys the supply air via the supply air line 11 into the radiation dryer 4.
  • this supply air is cooled to about 120 to 140 ° C., for example.
  • This partial cycle is of importance for the invention insofar as that the quantitatively possible air mass flow, which is dissipated to the air dryer, is reduced by the air mass flow m 5 .
  • the remaining ratio of m 1 to m 2 is important.
  • air mass flow is to be understood as meaning a unit in weight / time unit and in this case preferably kg / h.
  • the air dryer 5 has an air supply line 16 and an exhaust air line 17. Between the exhaust duct 17 and the supply air line 16, a connection 18 is arranged. In the connection 18, a conveyor 19 having a motor 19 and a fan 20 is arranged. Further, a Abschottklappe 21 is arranged in the connection. Finally, optionally in the connection 18, a heating device 22 may be arranged. The heater 22 may be formed, for example, as a combustion chamber. If such a heating device 22 is arranged in the connection 18 or in the supply air line 16, then it is expedient to provide a fresh air connection 23, which, just like the fresh air connection 12, is controllable. If necessary, this fresh air connection 23 serves to rinse the circuit through the air dryer 5.
  • the air dryer 5 thus has a first air guidance system 24 and the radiation dryer 4 has a second air guidance system 25.
  • Both air duct systems have a connection 18, 10 of supply air line 16, 11 and exhaust duct 17, 9.
  • Both air guide systems 24, 25 are connected to each other in the region of their exhaust duct 17, 9, i. There is a node 26 where the exhaust air 17, 9 leading lines meet.
  • an exhaust outlet 27 for the exhaust air mass flow m 4 is arranged, which has a motor 28 and a fan 29 having conveyor.
  • This conveyor has an even lower capacity than the other two conveyors 13, 14 and 19, 20. For example, a pressure rating of only 20 mbar is sufficient here.
  • the exhaust outlet 27 is disposed in the first air duct system 24 where the drying air is coldest and has the highest moisture content. The laden exhaust air mass flow m 4 is withdrawn at the exhaust outlet 27 with the lowest energy losses.
  • the web dryer arrangement 1 operates as follows: a small portion, for example 20%, of the exhaust air 9 of the radiation dryer is mixed with fresh air and thereby cooled to about 120 to 140 ° C and fed back to the radiation dryer 4 as supply air or blowing air. This serves, for example, for the purpose of boundary layer destruction at the place of radiation drying.
  • the largest part of the exhaust air 9 of the radiation dryer. 4 is fed into the air guide system 24 of the air dryer 5.
  • an air mass flow component (m 2 ) which is supplied to the air mass flow m 1 , it already ensures heating of the air required in the air dryer. If this is not the case to a sufficient extent, additional heat can be introduced via the heating device 22. Since the air in the air dryer 5 loads with moisture, a portion of this air is removed via the exhaust outlet 27.
  • all conveyors 14, 20, 29 are independently controllable. One can therefore control the air flow in the first air duct system differently than in the second air duct system.
  • the ratio of the total air mass flow m 1 supplied to the air dryer 5 to the air mass flow m 2 removed as air from the radiation dryer 4 is increased considerably compared with the prior art. It is therefore the ratio of the total air mass flow, which is supplied via the at least one first air supply line 16 to the air dryer 5, to the at least one second exhaust duct 9 at the air dryer 4 extracted air mass flow, which is not returned to the radiation dryer 4.
  • This ratio has a value between 1 and 2 in known web dryer arrangements of this kind. According to the invention, this value is increased to 3 to 10, preferably 4 to 8.
  • the air mass flow m 2 which is discharged at the radiation dryer, compared to the prior art, a significantly larger air mass fraction m 3 from the first exhaust duct 17 is mixed in order to achieve the desired air mass flow m 1 . This leads to a significant increase the efficiency, which should be explained by the following example.
  • a prior art web dryer assembly had m 1 at 14000 kg / h and 400 ° C, m 2 at 10000 kg / h and 500 ° C, and m 3 at 4000 kg / h and 230 ° C.
  • Such a constellation leads to a discharged via the exhaust outlet 27 air mass flow of 13800 kg / h at 230 ° C.
  • the following distribution would result: m 1 with 34000 kg / h and 260 ° C, m 2 with 10000 kg / h and 500 ° C and m 3 with 24000kg / h and 180 ° C.
  • Such a constellation leads to an air mass flow of 14,100 kg / h discharged through the exhaust air outlet 27 at 180 ° C.
  • the efficiency of the web dryer arrangement 1 increases from 53 to 64%. It has not yet been considered that air derived from the air dryer in the prior art has hitherto been used, for example, to return it to the place of radiation drying for the purpose of the destruction of boundary layers. As a result, the effectiveness of the material web dryer assembly 1 but is much less increased than with the inventive utilization of the prior art greatly increased air mass flow m 3 , which combined with the air mass flow m 2 forms the equally significantly enlarged Beermassenstrm m 1 . As far as possible, no air is returned from the air dryer to the radiation dryer. The exhaust air mass flow remains about the same compared to conventional web dryer arrangements, but with reduced temperatures, which causes the higher efficiency.
  • the increased air mass m 1 can be used to increase, for example, the drying surface 37 of the air dryer 5 over the prior art. This has the consequence that the material web can be subjected to more drying air.
  • the radiation dryer 4 is made according to FIG. 2 infrared modules 32 suspended from a support 36.
  • the carriers or guides attached to them also carry the supply lines and cables required by the infrared module.
  • the infrared modules 32 are known per se and will not be described further here. For example, we refer to the DE 19901145 A1 ,
  • infrared modules 32 are combined in one or more rows under a hood 31.
  • hood 31 At the edges there are usually suction and / or circulating air channels 30, via which the air heated by the combustion in the infrared modules 32 and the heat radiation and the water vapor emerging from the material web 2 can be removed.
  • the hood 31 is insulated at best on the rear side facing away from the material web side so that assembly personnel do not burn themselves when working on the infrared modules 32 accessible from there.
  • the outer walls of the hood have not been isolated as a rule. Accordingly, they consciously accepted to lose thermal energy to the environment. In many cases, the interior had to be additionally supplied with a very high amount of cooling air,
  • the infrared modules 32 which are located in a row, for example, can not be close to each other due to their thermal expansion and expandability. Through the gaps in between, the cooling air would be able to escape in a counterproductive manner into the region between infrared modules 32 and material web 2, which should have very high temperatures for drying the fibrous web. For this reason, the gaps between the infrared modules 32 are closed by seals 33. Only at the edges of the hood 31, exactly where inlet openings in a suction and / or recirculation duct 30 are present (in Fig.2 indicated by arrows), column 34 are provided, through which the heated after a short time cooling air from the interior 38 can be discharged into a suction and / or recirculation duct 30. In this way, a disturbing influence of the cooling air on the hot center between the infrared module 32 and material web 2 is avoided.
  • a suction and / or recirculating air duct 30 only in web direction of travel 3 at the end and if necessary, arrange the side of a hood 31.
  • no suction is installed in the inlet region 39 of the effective range of a radiation dryer 4.
  • the friction on the material web 2 ensures that the hot air, which is located between the infrared modules 32 and the material web is taken undisturbed by environmental influences in a suction and / or recirculation duct 30 at the end of the hood 31 can escape.
  • This configuration according to the invention is particularly true in an inclined position or even a vertical installation of the radiation dryer 4. Because by the inclination of the negative intake of cold ambient air in the inlet region 39 of the radiation dryer 4 is still supported by the natural thermals.
  • Fig. 4 illustrates the advantages of the material web dryer assembly 1 according to the invention with reference to a diagram.
  • the abscissa shows the quotient from m 1 to m 2 .
  • the ordinate indicates the thermal efficiency of the material web dryer assembly 1.
  • the two curves K1 and K2 stand for the cases K1: Radiation dryer with non-insulated suction and / or recirculating air duct 30
  • K2 radiation dryer with insulated suction and / or recirculating air channel 30 as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP09170441.1A 2008-09-22 2009-09-16 Séchoir pour bande de matériau Active EP2166298B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810042247 DE102008042247A1 (de) 2008-09-22 2008-09-22 Materialbahntrockneranordnung

Publications (3)

Publication Number Publication Date
EP2166298A2 true EP2166298A2 (fr) 2010-03-24
EP2166298A3 EP2166298A3 (fr) 2012-10-24
EP2166298B1 EP2166298B1 (fr) 2016-06-29

Family

ID=41463101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09170441.1A Active EP2166298B1 (fr) 2008-09-22 2009-09-16 Séchoir pour bande de matériau

Country Status (2)

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EP (1) EP2166298B1 (fr)
DE (1) DE102008042247A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016120933B4 (de) * 2016-11-03 2018-10-18 Voith Patent Gmbh Verwendung einer Trockenvorrichtung zur Herstellung eines nassgelegten Vliesstoffes
DE102020127946A1 (de) 2020-10-23 2022-04-28 Voith Patent Gmbh Effiziente Strichtrocknung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19901145A1 (de) 1999-01-14 2000-07-20 Krieger Gmbh & Co Kg Als Flächenstrahler ausgebildeter Infrarot-Strahler
EP1169511A1 (fr) 1999-03-18 2002-01-09 Metso Paper, Inc. Procede et dispositif de stabilisation du deplacement d'une bande de papier dans une machine a papier ou analogue
WO2005085729A2 (fr) 2004-03-02 2005-09-15 Nv Bekaert Sa Installation de sechage pour bandes
DE3910898B4 (de) 1988-04-25 2005-11-17 Metso Paper, Inc. Verfahren zum Trocknen einer sich bewegenden Bahn und Kombinationstrockner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1496404A (en) * 1975-03-25 1977-12-30 B & K Machinery Int Ltd Convection oven and method of drying solvents
FR2775065B1 (fr) * 1998-02-19 2000-05-26 Infra Rouge System Dispositif pour le traitement thermique de materiaux en feuille defilant en continu
CN101052853B (zh) * 2004-03-02 2010-06-16 贝卡尔特股份有限公司 用于传送幅料的红外线干燥设备
DE102007051962A1 (de) * 2007-10-31 2009-05-07 Voith Patent Gmbh Materialbahntrockneranordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910898B4 (de) 1988-04-25 2005-11-17 Metso Paper, Inc. Verfahren zum Trocknen einer sich bewegenden Bahn und Kombinationstrockner
DE19901145A1 (de) 1999-01-14 2000-07-20 Krieger Gmbh & Co Kg Als Flächenstrahler ausgebildeter Infrarot-Strahler
EP1169511A1 (fr) 1999-03-18 2002-01-09 Metso Paper, Inc. Procede et dispositif de stabilisation du deplacement d'une bande de papier dans une machine a papier ou analogue
WO2005085729A2 (fr) 2004-03-02 2005-09-15 Nv Bekaert Sa Installation de sechage pour bandes

Also Published As

Publication number Publication date
DE102008042247A1 (de) 2010-04-01
EP2166298A3 (fr) 2012-10-24
EP2166298B1 (fr) 2016-06-29

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