EP0264637B1 - Durchlauftrockner für Materialbahnen, insbesondere Offset-Trockner - Google Patents

Durchlauftrockner für Materialbahnen, insbesondere Offset-Trockner Download PDF

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Publication number
EP0264637B1
EP0264637B1 EP87113745A EP87113745A EP0264637B1 EP 0264637 B1 EP0264637 B1 EP 0264637B1 EP 87113745 A EP87113745 A EP 87113745A EP 87113745 A EP87113745 A EP 87113745A EP 0264637 B1 EP0264637 B1 EP 0264637B1
Authority
EP
European Patent Office
Prior art keywords
dryer
air
heating
circulating air
fed
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.)
Expired - Lifetime
Application number
EP87113745A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0264637A2 (de
EP0264637A3 (en
Inventor
Hilmar Vits
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.)
Contiweb BV
Original Assignee
Vits Hilmar
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 Vits Hilmar filed Critical Vits Hilmar
Publication of EP0264637A2 publication Critical patent/EP0264637A2/de
Publication of EP0264637A3 publication Critical patent/EP0264637A3/de
Application granted granted Critical
Publication of EP0264637B1 publication Critical patent/EP0264637B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B41F23/043—Drying webs by convection using gas or fuel burners
    • 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

Definitions

  • the invention relates to a continuous dryer for material webs, in particular for offset printing, consisting of blowing nozzles acting on one or both sides with heated air, at least one blower feeding the blowing nozzles with circulating air, at least one gas-fed heating device for the circulating air and at least one afterburning device for the Recirculating air containing pollutants and an inlet slot and an outlet slot for the material web, mixing chambers being provided in at least one of these slots above and below the material web guide level, in which the fresh air flowing in via the inlet slot and optionally the outlet slot is mixed with hot gases of the afterburning device and the outlets for drying inside.
  • a heat exchanger is provided in the post-combustion device, through which the heat of the post-combustion is recovered by heating the exhaust air to be cleaned from the dryer in the heat exchanger before it is fed to the post-combustion.
  • This type of cleaning of the exhaust air has a number of disadvantages:
  • the heat exchanger suitable for post-combustion must be made of stainless steel. Such a stainless steel design is expensive.
  • the heat exchanger Since, when the dryer atmosphere is being heated up, the heat exchanger must be in operation in order to be able to deliver heated air to the blowing nozzles for the purpose of uniform heating of the dryer atmosphere, rapid heating can only be achieved with an increased throughput of air heated by the afterburning.
  • the circulating air blower is designed for the normal throughput volume, it cannot deliver this increased air throughput.
  • the heating output would have to be increased by two to three times compared to normal operation. This would require a circulating air blower with a capacity that is about ten times higher. The construction effort would be correspondingly large.
  • the invention has for its object to improve a continuous dryer for material webs with regard to heating the dryer atmosphere, with particular attention to pollutant production.
  • each heating device and afterburning device fed with gas and recirculating air from the dryer are combined into one unit and have a closed combustion chamber in the dryer housing.
  • the absence of the heat exchanger has the further advantage that the dryer atmosphere can be heated up quickly without additional effort. Because of the lack of a heat exchanger, it is not necessary to install a circulating air blower with increased performance.
  • the temperature of the dryer atmosphere is regulated via the amount of air to be supplied to the heating device. Proportional control makes it easy to ensure that the gas volume follows the controlled air volume.
  • the temperature of the hot gases of the afterburning is preferably regulated via the amount of air to be fed from the dryer to the afterburning.
  • the dryer atmosphere is free of pollutants but not free of solvents
  • the solvents can be obtained from the exhaust air of the dryer by cooling the exhaust air, since these solvents condense on cooling. These solvents can be collected and used as fuel.
  • a comparison of the heating values shows that the heating value of the condensate obtained from the exhaust air corresponds to the heating value of the gas supplied to the heating device. The expenditure of thermal energy is physically covered by the solvents contained in the printing ink applied to the material web.
  • a dryer housing 1 has an inlet slot 2 on its front end wall for a material web 3 to be dried.
  • a corresponding outlet slit is provided on its rear forehead, not shown.
  • the material web 3 is blown with heated air during the passage through the dryer and thereby guided in a floating manner and dried.
  • above and below the material web 3 there are a plurality of nozzle boxes 4, 5 which extend transversely to the material web running direction and are fed with heated blown air, e.g. Air cushion nozzles provided.
  • These air cushion nozzles 4, 5 are fed via a common channel 6, 7 by a blower 9, 10 which draws in air from the dryer atmosphere via a suction opening 11, 12.
  • the dryer atmosphere is heated exclusively by a heating and afterburning device which forms a unit.
  • a heating and afterburning device which forms a unit.
  • Such a heating and afterburning device is provided for each zone above and below the material web 3. It consists of a burner 13, 14, the burner mouth 15 of which supplies gas via a central line 16 and air via a ring channel 17 surrounding this line 16.
  • the air is supplied via a line 18 from the channel 6, 7.
  • a motor control valve 19 is provided in line 18 and is controlled as a function of the temperature of the dryer atmosphere.
  • the supply of gas is controlled by a constant pressure control valve 20, the control membrane of which is acted upon by the air pressure in the annular channel 17 on one side.
  • the constant pressure control valve 20 is constructed in such a way that proportional control of the gas quantity takes place by controlling the air supplied to the burner 13 by the engine control valve 19.
  • the burner 13 has a combustion chamber 21, 22 which opens eccentrically from the side into a second larger combustion chamber 23 which extends over the length of the zone.
  • the combustion chamber 21, 22 is surrounded by an annular channel 25, which is connected to the channel 6, 7 via a line 26.
  • the supply of circulating air to the ring channel 25 is controlled by means of a motor control valve 27 arranged in the line 26 as a function of the temperature in the combustion chamber 21, 22.
  • the hot flue gases of the combustion chamber 21, 22 and the air supplied via the annular channel 25 are mixed at the end of the combustion chamber 21, 22 and enter the combustion chamber 23, 24 eccentrically from the side. This then results in a spiral flow through the combustion chamber 23, 24 from one end to the other end.
  • the hot gas passes through a manifold 28, 29 and a line 30, 31 into a nozzle pipe 32, 33 that extends transversely to the material web.
  • Blowing jets emerge from the nozzle holes arranged in series in this nozzle tube 32, 33, which blow against a guide plate 34, 35, which is convexly curved toward the material web 3 and increasingly approaches the material web in the direction of the material web.
  • a mudguard 36, 37 is assigned to the edge of this guide plate 34, 35 opposite the interior of the housing at a small distance from the material web 3. This mudguard 36, 37 forms a channel 38, 39 together with the guide plate 34, 35 and the front housing wall.
  • the hot gases of the heating and afterburning are mixed with the fresh air flowing in via the slot 2 and thereby reduced to a temperature that is not critical for cracking of the volatile substances. It also prevents cold fresh air from entering the interior of the dryer. After mixing, the hot gases and the fresh air enter the interior of the dryer via duct 38, 39.
  • the dryer is operated in the following way.
  • heating up i.e. when the dryer atmosphere is cold
  • the motor control valve 19 controlled in such a way that a large amount of gas is supplied via the constant pressure valve 20 and rapid heating takes place in this way.
  • the flue gas volume of the combustion chamber 21, 22 and also that of the relatively long second combustion chamber (afterburning chamber) 23, 24 via the ring line 25 are circulating air volumes are large.
  • the recirculated air supplied is mainly used to cool the flue gases by adding them.
  • the air and gas supply to the burner regulates itself to the lower heat requirement when starting up the system. Because of the then lower flue gas volume from the combustion chamber 21, 22, a proportionally smaller volume of the circulating air to be supplied to the afterburning chamber 23, 24 and controllable via the control valve 27 would suffice, but because of the meanwhile higher temperature of the circulating air to be supplied via the ring line and the associated lower The cooling effect does not reduce the conveyance of circulating air into the afterburning chamber to the same extent.
  • the solvent vapors which constantly accumulate at the beginning of the drying process and reach the dryer atmosphere, increase their concentration in the dryer atmosphere.
  • These combustible substances present in the dryer atmosphere which are fed to the afterburning chamber 23, 24 with the recirculated air extracted from the dryer, are burned here.
  • This has the advantage that the thermal energy generated thereby leads to a corresponding reduction in the heating power of the burner 13. Due to the in turn lower heating power of the burner 13, the circulating air volume supplied to the afterburning chamber 23, 24 is reduced, so that the dwell time of the circulating air in the afterburning chamber is long enough for a good burnout of the combustible materials or for a great purity of the circulating air.
  • the self-sufficiency of the dryer with thermal energy is limited by an exhaust air volume reduced to a fraction compared to conventional dryers.
  • the exhaust air volume cannot be reduced to zero, however, because it is necessary to keep the dryer atmosphere at an oxygen-containing level sufficient for the operation of the burner by drawing in fresh air, for example via the dryer inlet and outlet slots.
  • a certain volume of exhaust air is required to keep the dryer at negative pressure so that the steam-containing atmosphere of the dryer does not escape into the atmosphere through the dryer slots.
  • the exhaust air generated during operation of the dryer differs from conventional dryers in that it has a lower exhaust air volume, the exhaust air still containing oil vapor but free of harmful substances (cracking substances).
  • the exhaust air can therefore be cleaned by condensation, i.e. perform with recovery of solvent that can be used as fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP87113745A 1986-10-22 1987-09-19 Durchlauftrockner für Materialbahnen, insbesondere Offset-Trockner Expired - Lifetime EP0264637B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3635833 1986-10-22
DE19863635833 DE3635833A1 (de) 1986-10-22 1986-10-22 Durchlauftrockner fuer materialbahnen, insbesondere offset-trockner und verfahren zum thermischen betreiben eines durchlauftrockners

Publications (3)

Publication Number Publication Date
EP0264637A2 EP0264637A2 (de) 1988-04-27
EP0264637A3 EP0264637A3 (en) 1988-08-24
EP0264637B1 true EP0264637B1 (de) 1990-12-19

Family

ID=6312174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113745A Expired - Lifetime EP0264637B1 (de) 1986-10-22 1987-09-19 Durchlauftrockner für Materialbahnen, insbesondere Offset-Trockner

Country Status (3)

Country Link
US (1) US4989348A (enrdf_load_stackoverflow)
EP (1) EP0264637B1 (enrdf_load_stackoverflow)
DE (2) DE3635833A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022223075A1 (de) * 2021-04-19 2022-10-27 Dürr Systems Ag, Stuttgart Werkstückbearbeitungsanlage und verfahren zum herstellen und betreiben einer solchen werkstückbearbeitungsanlage

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD277883A1 (de) * 1988-12-12 1990-04-18 Polygraph Leipzig Trockner fuer rollenrotationsdruckmaschinen
NL9101926A (nl) * 1991-11-19 1993-06-16 Stork Contiweb Droger met verbeterde gashuishouding.
US5303484A (en) * 1992-04-09 1994-04-19 Thermo Electron Web Systems, Inc. Compact convective web dryer
DE29612352U1 (de) * 1996-07-17 1997-02-13 Paul Schneider Rohrleitungsbau und Wärmetechnik GmbH, 96472 Rödental Brennkammer zum Betrieb einer Trocknungsanlage mit Multifunktionsbrennereinrichtung und Pralleinrichtung zur energiesparenden und emissionsarmen Trocknung
DE19701084A1 (de) * 1997-01-15 1998-07-16 Hans Georg Platsch Trocknereinheit
DE19713529A1 (de) * 1997-04-01 1998-10-08 Heidelberger Druckmasch Ag Trockner für eine Materialbahn mit Abgasezirkulation
CN1119611C (zh) * 1998-05-07 2003-08-27 美格特克系统公司 有全组合回热式热源的箔材干燥器及干燥箔材的方法
US6308626B1 (en) * 1999-02-17 2001-10-30 Macdermid Acumen, Inc. Convertible media dryer for a large format ink jet print engine
US6651357B2 (en) * 2001-01-12 2003-11-25 Megtec Systems, Inc. Web dryer with fully integrated regenerative heat source and control thereof
WO2005085730A2 (en) 2004-03-02 2005-09-15 Nv Bekaert Sa Infrared drier installation for passing web
FR2867263B1 (fr) * 2004-03-02 2006-05-26 Solaronics Irt Installation de sechage pour une bande defilante, notamment pour une bande de papier
DE102004040131B4 (de) * 2004-08-18 2008-02-21 Relox Gmbh Verfahren und Vorrichtung zur Trocknung von bahnförmigem Material mit einer integrierten katalytischen Verbrennung der Schadstoffe
DE102008032053A1 (de) 2008-07-08 2010-01-14 Kaindl Decor Gmbh Verfahren und Vorrichtung zum Trocknen und Vorkondensieren von Imprägnaten, welche aus mit Kunstharz getränktem, folienartigem Bahnmaterial gebildet sind; Melaminharz-freies Imprägnat
DE102010006550B4 (de) * 2010-02-01 2015-08-13 Eisenmann Ag Vorrichtung zum Trocknen von Gegenständen
DE102012002865B4 (de) 2012-02-11 2021-06-10 Gogas Goch Gmbh & Co. Kg Verfahren zur energetischen Optimierung des Trocknungsprozesses von mit organisch-lösemittelhaltigen Stoffen behandelten Erzeugnissen
CN105674695A (zh) * 2016-02-23 2016-06-15 王亚萍 一种天然气二极管干燥箱
CN109539764A (zh) * 2018-12-26 2019-03-29 苏州爱可姆机械有限公司 一种用于材料烘干机的热补给新风系统
DE102023123490A1 (de) * 2023-08-31 2025-03-06 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung und Verfahren zum Herstellen wenigstens einer Elektrode, insbesondere für eine Speicherzelle zum Speichern von elektrischer Energie

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2412446A1 (de) * 1974-03-15 1975-09-18 Vits Maschinenbau Gmbh Trockner fuer eine durchlaufende warenbahn
DE2501268A1 (de) * 1975-01-15 1976-07-22 Otto Dipl Ing Brust Integrierte thermische nachverbrennungs- und heizanlage fuer trockenoefen
DE2616347C3 (de) * 1976-04-14 1983-12-01 Vits-Maschinenbau Gmbh, 4018 Langenfeld Durchlauftrockner für Warenbahnen
DE2948603C2 (de) * 1979-12-03 1986-05-22 Pohl, Hans Christoph, Dr.-Ing., 5810 Witten Verfahren zur Abfuhr von brennbaren Lösungsmitteln aus einer Trocknungsanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022223075A1 (de) * 2021-04-19 2022-10-27 Dürr Systems Ag, Stuttgart Werkstückbearbeitungsanlage und verfahren zum herstellen und betreiben einer solchen werkstückbearbeitungsanlage

Also Published As

Publication number Publication date
EP0264637A2 (de) 1988-04-27
DE3635833C2 (enrdf_load_stackoverflow) 1990-03-01
DE3766791D1 (de) 1991-01-31
EP0264637A3 (en) 1988-08-24
US4989348A (en) 1991-02-05
DE3635833A1 (de) 1988-05-05

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