EP0273230B1 - Process and apparatus for the continuous thermal treatment of a moving textile web - Google Patents

Process and apparatus for the continuous thermal treatment of a moving textile web Download PDF

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Publication number
EP0273230B1
EP0273230B1 EP87117916A EP87117916A EP0273230B1 EP 0273230 B1 EP0273230 B1 EP 0273230B1 EP 87117916 A EP87117916 A EP 87117916A EP 87117916 A EP87117916 A EP 87117916A EP 0273230 B1 EP0273230 B1 EP 0273230B1
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Prior art keywords
exhaust gas
treatment zone
treatment
heated
stream
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EP87117916A
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German (de)
French (fr)
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EP0273230A3 (en
EP0273230A2 (en
Inventor
Harry Gresens
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Brueckner Trockentechnik GmbH and Co KG
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Brueckner Trockentechnik GmbH and Co KG
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Priority to AT87117916T priority Critical patent/ATE58226T1/en
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Publication of EP0273230A3 publication Critical patent/EP0273230A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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
    • 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 method for thermal treatment, in particular for drying and / or fixing, a continuously moving textile fabric web in a treatment device with at least two treatment zones traversed by the fabric web in accordance with the preamble of claim 1. Furthermore, the invention relates to a treatment device to carry out this procedure.
  • a second partial exhaust gas stream is drawn off and freed of the pollutant components contained therein by combustion.
  • the second partial exhaust gas stream heated by this combustion is then used first for preheating the second partial exhaust gas stream supplied to the combustion device and then for reheating the first partial exhaust gas stream before it is released into the atmosphere.
  • the invention is based on the object of further improving a method of the type required in the preamble of claim 1 in such a way that the heat consumption and thus the energy costs for the exhaust gas purification can still be reduced considerably and at the same time the structural outlay for the equipment parts required for this is significantly reduced can be.
  • thermal treatment facilities such as e.g. Tensioning machines
  • combined thermal treatment processes namely in general drying and fixing
  • the textile fabric web is dried in the first treatment zone, water vapor essentially being produced due to the temperatures prevailing there, while fixation is mainly carried out in the second treatment zone, this being carried out at higher temperatures than in the first treatment zone, so that here too more Substances, etc. also spinning and winding oils, evaporate and are added to the exhaust gas to be extracted.
  • the entire exhaust gas is now drawn off from the rear end of the first treatment zone, as viewed in the direction of travel of the web, that is to say generally in the dryer part of the treatment device, and this exhaust gas flow is only regulated in a controlled manner for one to be fed into the second treatment zone heated to a suitable temperature and then introduced as a fresh gas quantity directly into this second treatment zone, corresponding to the general procedure explained above, ie into the fixing zone.
  • Exhaust gas laden with water vapor in the first treatment zone is heated further in a permissible manner in order to be able to use it in the subsequent second treatment zone as the amount of fresh gas required there, but this temperature increase also means that this exhaust gas used as fresh gas in the second treatment zone now prepared for an increased steam load and there is no fear of condensation of the high water vapor content of this exhaust gas.
  • a partial exhaust gas stream is now continuously withdrawn, which is to be released into the atmosphere.
  • This partial exhaust gas stream drawn off from the second treatment zone is in addition to water vapor with other vaporized substances, such as evaporated spinning and winding oils and possibly other pollutant substances, with some of the leakage air coming from the web exit slot at this end of the treatment device or second treatment zone.
  • This partial exhaust gas stream drawn off from the second treatment zone is then fed to the combustion device (post-combustion device), initially in the same way as in the process according to German patent 2 812 966, in that it has previously been preheated strongly with the exhaust gas partial stream already heated by the combustion of the pollutant components.
  • the combustion device post-combustion device
  • this heated partial exhaust gas stream has preheated the partial exhaust gas stream coming directly from the first treatment zone, it is used for further heating of the exhaust gas stream removed from the first treatment zone. Before this heated partial exhaust gas stream is released into the atmosphere, however, it is first used for heating the fresh air to be supplied to the treatment device (at the end of the web of material).
  • the partial exhaust gas stream from the second treatment zone is therefore, after it has been heated in the combustion device, according to the invention, firstly for preheating the partial exhaust gas stream coming directly from the second treatment zone, secondly for further heating the exhaust gas stream removed from the first treatment zone and thirdly for heating the treatment device fresh air to be supplied is used and sufficiently heated or cooled.
  • the total amount of exhaust gas from the thermal treatment device is reduced to approximately 50% compared to known designs by using the exhaust gas from the first treatment zone a second time (in the second treatment zone) after it has been heated to an admissible, regulated extent has been.
  • the thermal treatment device illustrated in the drawing contains, as the actual treatment device for a heat treatment of a textile fabric web 1 continuously moving through it, a tensioning machine 2 which is divided into two treatment zones, of which the first treatment zone first passed through the fabric web 1 includes a dryer part 2a and the second heat treatment zone passed through by the web 1 forms a fixing part 2b.
  • This tensioning machine 2 can be implemented in a conventional manner, i.e. Both the dryer part 2a and the fixing part 2b can be divided into several treatment fields.
  • the material web 1 passes through this tensioning machine 2 continuously in the direction of the arrow 3.
  • the thermal treatment device further contains a combustion device designed as a thermal afterburning device 4, which can be equipped with a burner 5, preferably a gas burner.
  • a combustion device designed as a thermal afterburning device 4, which can be equipped with a burner 5, preferably a gas burner.
  • the web end 2b ' is connected via an exhaust pipe 6 to the thermal afterburning device 4 with the interposition of a first indirect heat exchanger 7.
  • the tensioning machine 2 is also assigned two further indirect heat exchangers, namely a second heat exchanger 8 and a third heat exchanger 9. All three heat exchangers 7, 8, 9 are connected to a main exhaust gas line 10, which starts from the thermal afterburning device 4 and leads to a chimney 11 and via which an exhaust gas partial flow heated in the thermal afterburning device 4 first of the one side of the first heat exchanger 7, then - at least partially - the one side of the second heat exchanger 8 and then - again at least partially - the one side of the third heat exchanger 9 is supplied before it is released into the atmosphere via the chimney 11.
  • a main exhaust gas line 10 which starts from the thermal afterburning device 4 and leads to a chimney 11 and via which an exhaust gas partial flow heated in the thermal afterburning device 4 first of the one side of the first heat exchanger 7, then - at least partially - the one side of the second heat exchanger 8 and then - again at least partially - the one side of the third heat exchanger 9 is supplied before it is released into the atmosphere via the chimney
  • the other side of the first heat exchanger 7 is - as already indicated - via the exhaust pipe 6 which is Outgoing 2b 'of the fixing part 2b coming exhaust gas stream supplied for change before it is introduced into the thermal afterburning device 4 in order to burn the pollutant components contained therein in the usual way.
  • the second side of the second heat exchanger 8 is supplied with all of the exhaust gas from the rear end 2a 'of the dryer part 2a, as viewed in the direction of travel of the web (arrow 3), in order to be heated further in a controlled manner before this entire exhaust gas flow is introduced as fresh gas into the front end 2b "of the fixing part 2b, again viewed in the direction of the web.
  • the surrounding space is fed, the fresh air thus heated being introduced via a fresh air supply line 15 into the web end 2a "of the dryer part 2a and thus the tensioning machine 2.
  • bypass control flaps 16, 16a and 17, 17a and one bypass line 18 and 19 provided in the line sections of this main exhaust line 10, which lead from the first heat exchanger 7 to the second heat exchanger 8 and from the second heat exchanger 8 to the third heat exchanger 9, whereby at least part of the heated partial exhaust gas flow can be directed in a precisely controllable manner on the one hand around the second heat exchanger 8 and on the other hand around the third heat exchanger 9 in the bypass.
  • These bypass devices make it possible to operate the two heat exchangers 8 and 9 in a precisely controllable manner, i.e.
  • the fresh air to be introduced into the web end 2a "into the dryer part 2a is preferably heated to a temperature which corresponds approximately to the temperature of the exhaust gas drawn off at the rear end 2a 'of the dryer part 2a.
  • the exhaust gas stream drawn off here is then also in the second heat exchanger 8 in its temperature can be regulated in a precisely controllable manner (for introduction as a fresh gas amount into the fixing part 2b), this increased temperature then roughly corresponding to the temperature of the partial gas stream (line 6) drawn off at the end of this fixing part 2b.
  • the temperature of the hot gas stream circulated there is approximately 200 ° C.
  • the exhaust gas partial stream drawn off via the exhaust line 6 at the end 2b ′ of the web again has a temperature of approximately 180 ° C. If one were to feed the partial exhaust gas stream withdrawn here at this temperature (180 ° C.) directly to the thermal afterburning device 4, this would mean that this device 4 still has to be supplied with a considerable additional part of thermal energy via its burner 5 in order to carry out the thermal afterburning to burn the pollutant components contained in this partial gas stream at about 700 to 800 ° C.
  • the partial exhaust gas stream drawn from the fixing part 2b via the line 6 in the first heat exchanger 7 is first heated to about 550 to 650 ° C, preferably about 600 ° C, with the help of the exhaust gas stream coming from the afterburning device 4 and heated to about 700 to 750 ° C is preheated, only a relatively small additional heat energy supply via the burner 5 to the thermal afterburning device 4 is required.
  • the heated exhaust gas partial flow leaves the first heat exchanger 7 at a temperature of approximately 350 ° C., at least partially passes through the second heat exchanger 8 and is cooled there to approximately 320 ° C. before it flows through the third heat exchanger 9 and is released into the atmosphere at about 250 ° C. via the chimney 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The thermal treatment of a continuously moving textile web takes place by means of hot gas in a treatment apparatus having at least two successive treatment zones. The entire waste gas of the first treatment zone is introduced into the second treatment zone as fresh gas once it has been heated up. A partial waste-gas stream drawn off at the end of the second treatment zone undergoes secondary combustion. The partial waste-gas stream thus heated first of all warms the second partial waste-gas stream coming out of the second treatment zone, following which, before its discharge into the atmosphere, the partial waste-gas stream coming out of the first treatment zone and then also the fresh air are heated. In this way, extremely cost-effective operation of the entire treatment apparatus is achieved at the same time as reliable waste-gas cleaning and disposal.

Description

Die Erfindung betrifft eine Verfahren zur thermischen Behandlung, insbesondere zum Trocknen und/oder Fixieren, einer kontinuierlich bewegten textilen Warenbahn in einer Behandlungseinrichtung mit wenigstens zwei von der Warenbahn nacheinander durchlaufenen Behandlungszonen, gemäß dem Oberbegriff des Patentanspruches 1. Ferner befaßt sich die Erfindung mit einer Behandlungseinrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for thermal treatment, in particular for drying and / or fixing, a continuously moving textile fabric web in a treatment device with at least two treatment zones traversed by the fabric web in accordance with the preamble of claim 1. Furthermore, the invention relates to a treatment device to carry out this procedure.

Nach den neuen gesetzlichen Bestimmungen müssen auch die Schadstoffemissionen von thermischen Behandlungseinrichtungen für textile Warenbahnen, z.B. Spannmaschinen und dergleichen, stark eingeschränkt werden. Wird z.B. eine solche Spannmaschine zum Trocknen und/oder Fixieren von textilen Warenbahnen nach deren Färbebehandlung mit modernen Textilfarbstoffen und sogenannten Carriern verwendet, also zum Trocknen und/oder Fixieren alkalischer, chlorhaltiger Substanzen, dann ist die Installation einer solchen Spannmaschine genehmigungspflichtig, während in allen anderen Behandlungsfällen diese Installation immerhin meldepflichtig ist. Bei einer thermischen Behandlung von mit alkalischen, also chlorhaltigen Substanzen gefärbten textilen Warenbahnen müssen entsprechende Abgasbehandlungseinrichtungen eingebaut werden, um die Schadstoffemissionen unter der vorgeschriebenen Grenze zu halten. Der Einbau solcher Abgasbehandlungseinrichtungen ist selbst bei relativ geringen Abgasemissionswerten dann erforderlich, wenn Nachbarschaftsbeschwerden über eventuelle Emissionsbelästigungen vorliegen.According to the new legal provisions, the pollutant emissions from thermal treatment facilities for textile webs, e.g. Tensioners and the like, are severely restricted. E.g. If such a tensioning machine is used to dry and / or fix textile webs after their dyeing treatment with modern textile dyes and so-called carriers, i.e. to dry and / or fix alkaline, chlorine-containing substances, then the installation of such a tensioning machine is subject to approval, while in all other treatment cases this is required Installation is after all notifiable. In the case of thermal treatment of textile material webs dyed with alkaline, that is to say chlorine-containing substances, appropriate exhaust gas treatment devices must be installed in order to keep the pollutant emissions below the prescribed limit. The installation of such exhaust gas treatment devices is necessary even with relatively low exhaust gas emission values if there are complaints from the neighborhood about possible emissions nuisance.

In der Praxis sind daher verschiedene Verfahren und Einrichtungen entwickelt worden, mit denen man versucht hat, die Abgase solcher thermischen Behandlungseinrichtungen für textile Warenbahnen zu reinigen. Hierzu zählen insbesondere Kondensations-, Filter- sowie thermische Nachverbrennungsverfahren und - Einrichtungen. Gerade für die thermische Nachverbrennung der Abgase sind nicht nur sehr hohe Investitionskosten für die entsprechende Einrichtung selbst erforderlich, sondern auch für den Betrieb dieser Einrichtungen sind erhebliche Energiekosten notwendig, da vielfach die zur Verbrennung erforderliche Energiemenge den Wärmebedarf einer solchen thermischen Behandlungseinrichtung, insbesondere einer Spannmaschine, um 100 % übersteigt. Dies bedeutet, daß nach dem Einbau einer thermischen Nachverbrennungseinrichtung die ganze thermische Behandlungseinrichtung einen Wärmeverbrauch hat, der etwa doppelt so hoch ist wie zuvor, also ohne die thermische Nachverbrennungseinrichtung.In practice, therefore, various methods and devices have been developed with which attempts have been made to purify the exhaust gases of such thermal treatment devices for textile webs. These include, in particular, condensation, filter and thermal post-combustion processes and equipment. Especially for the thermal afterburning of the exhaust gases, not only are very high investment costs required for the corresponding device itself, but also considerable energy costs are required for the operation of these devices, since the amount of energy required for combustion often meets the heat requirements of such a thermal treatment device, in particular a tensioning machine, by 100%. This means that after the installation of a thermal afterburning device, the entire thermal treatment device has a heat consumption which is approximately twice as high as before, that is to say without the thermal afterburning device.

Eine erhebliche Verbesserung hinsichtlich der Energiekosten und des Wärmeverbrauchs bringt bereits ein von der Anmelderin vorgeschlagenes Verfahren gemäß dem deutschen Patent 28 12 966, wie es im Oberbegriff des Anspruches 1 als bekannt vorausgesetzt wird. Bei diesem bekannten Verfahren wird die gesamte Abgasmenge in Form von zwei Abgas-Teilströmen aus zwei gesonderten Behandlungszonen abgezogen, wobei der aus einer von der Warenbahn zuerst durchlaufenen Behandlungszone abgezogene erste Abgas-Teilstrom einem Sprühkühler mit zugehörigem Kühlturm zugeführt wird, um dort die im Abgasteilstrom enthaltenen kondensierbaren Bestandteile zu entfernen. Daraufhin wird dieser von kondensierbaren Bestandteilen befreite erste Abgasteilstrom in einem Wärmetauscher wieder aufgeheizt und zum Teil in die erste Behandlungszone zurückgeführt und zum Teil der zweiten Behandlungszone zugeführt. Am Ende der zweiten Behandlungszone wird ein zweiter Abgas-Teilstrom abgezogen und durch Verbrennung von den darin enthaltenen Schadstoff-Bestandteilen befreit. Der durch diese Verbrennung erhitzte zweite Abgas-Teilstrom wird dann zunächst zur Vorwärmung des der Verbrennungseinrichtung zugeführten zweiten Abgas-Teilstromes und dann zur Wiedererwärmung des ersten Abgas-Teilstromes verwendet, bevor er in die Atmosphäre entlassen wird.A considerable improvement in terms of energy costs and heat consumption is already brought about by a method proposed by the applicant according to German patent 28 12 966, as is assumed to be known in the preamble of claim 1. In this known method, the total amount of exhaust gas is drawn off in the form of two exhaust gas partial streams from two separate treatment zones, the first exhaust gas partial stream drawn off from a treatment zone first passed through the web being fed to a spray cooler with associated cooling tower, in order to contain the exhaust gas partial stream to remove condensable constituents. Thereupon, this first partial exhaust gas stream, which has been freed of condensable constituents, is reheated in a heat exchanger and partly returned to the first treatment zone and partly supplied to the second treatment zone. At the end of the second treatment zone, a second partial exhaust gas stream is drawn off and freed of the pollutant components contained therein by combustion. The second partial exhaust gas stream heated by this combustion is then used first for preheating the second partial exhaust gas stream supplied to the combustion device and then for reheating the first partial exhaust gas stream before it is released into the atmosphere.

Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art in der Weise weiterzuverbessern, daß der Wärmeverbrauch und damit die Energiekosten für die Abgasreinigung noch erheblich gesenkt werden können und gleichzeitig der bauliche Aufwand für die dafür erforderlichen Einrichtungsteile deutlich herabgesetzt werden kann.The invention is based on the object of further improving a method of the type required in the preamble of claim 1 in such a way that the heat consumption and thus the energy costs for the exhaust gas purification can still be reduced considerably and at the same time the structural outlay for the equipment parts required for this is significantly reduced can be.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung, insbesondere auch eine bevorzugte Ausführung einer Behandlungseinrichtung zur Durchführung dieses erfindungsgemäßen Verfahrens sind Gegenstand der Unteransprüche.Further advantageous embodiments of the invention, in particular also a preferred embodiment of a treatment device for performing this method according to the invention are the subject of the subclaims.

Bei der vorliegenden Erfindung geht man von der Erkenntnis aus, daß in thermischen Behandlungseinrichtungen, wie z.B. Spannmaschinen, kombinierte thermische Behandlungsverfahren, nämlich im allgemeinen Trocknen und Fixieren, in wenigstens zwei von der Warenbahn nacheinander durchlaufenen Behandlungszonen durchgeführt werden. Dabei wird in der ersten Behandlungszone die textile Warenbahn getrocknet, wobei aufgrund der dort herrschenden Temperaturen im wesentlichen Wasserdampf anfällt, während in der zweiten Behandlungszone vor allem fixiert wird, wobei dies bei höheren Temperaturen als in der ersten Behandlungszone durchgeführt wird, so daß hier auch weitere Substanzen, u.a. auch Spinn- und Spulöle, verdampfen und dem abzuziehenden Abgas hinzugefügt werden.In the present invention, it is recognized that in thermal treatment facilities such as e.g. Tensioning machines, combined thermal treatment processes, namely in general drying and fixing, are carried out in at least two treatment zones which are passed through one after the other by the material web. The textile fabric web is dried in the first treatment zone, water vapor essentially being produced due to the temperatures prevailing there, while fixation is mainly carried out in the second treatment zone, this being carried out at higher temperatures than in the first treatment zone, so that here too more Substances, etc. also spinning and winding oils, evaporate and are added to the exhaust gas to be extracted.

Bei diesem erfindungsgemäßen Verfahren wird nun aus dem - in Warenbahnlaufrichtung betrachtet - hinteren Ende der ersten Behandlungszone, also im allgemeinen in dem Trocknerteil der Behandlungseinrichtung, das gesamte Abgas abgezogen, und dieser Abgasstrom wird lediglich in geregelter Weise auf eine für die Zuführung in die zweite Behandlungszone geeignete Temperatur erwärmt und dann insgesamt als Frischgasmenge direkt in diese zweite Behandlungszone, entsprechend der zuvor erläuterten allgemeinen Vorgehensweise also in die Fixierzone, eingeleitet. Hierdurch wird nicht nur das in der Hauptsache mit Wasserdampf beladene Abgas der ersten Behandlungszone auf zulässige Weise weiter erwärmt, um es in der nachfolgenden zweiten Behandlungszone als die dort erforderliche Frischgasmenge verwenden zu können, sondern diese Temperaturerhöhung bedeutet gleichzeitig auch, daß dieses als Frischgas in der zweiten Behandlungszone benutzte Abgas nun für eine erhöhte Dampfbeladung aufbereitet und eine Kondensation des hohen Wasserdampfanteiles dieses Abgases nicht zu befürchten ist.In this method according to the invention, the entire exhaust gas is now drawn off from the rear end of the first treatment zone, as viewed in the direction of travel of the web, that is to say generally in the dryer part of the treatment device, and this exhaust gas flow is only regulated in a controlled manner for one to be fed into the second treatment zone heated to a suitable temperature and then introduced as a fresh gas quantity directly into this second treatment zone, corresponding to the general procedure explained above, ie into the fixing zone. This will not only do that Exhaust gas laden with water vapor in the first treatment zone is heated further in a permissible manner in order to be able to use it in the subsequent second treatment zone as the amount of fresh gas required there, but this temperature increase also means that this exhaust gas used as fresh gas in the second treatment zone now prepared for an increased steam load and there is no fear of condensation of the high water vapor content of this exhaust gas.

Da bei diesem erfindungsgemäßen Verfahren das gesamten Abgas aus der ersten Behandlungszone - nach entsprechender Temperaturerhöhung - in der zweiten Behandlungszone nochmals verwendet und nur das am Ende der zweiten Behandlungszone abgezogene Abgas in die Atmosphäre entlassen wird, können aufwendige Abgasreinigungseinrichtungen für diesen Abgasteil aus der ersten Behandlungszone entfallen.Since in this method according to the invention the entire exhaust gas from the first treatment zone - after a corresponding temperature increase - is used again in the second treatment zone and only the exhaust gas drawn off at the end of the second treatment zone is released into the atmosphere, complex exhaust gas cleaning devices for this exhaust gas part from the first treatment zone can be dispensed with .

Am Warenbahn-Auslaufende der zweiten Behandlungs zone (also im allgemeinen der Fixierzone) wird nun ständig ein Abgasteilstrom abgezogen, der in die Atmosphäre entlassen werden soll. Dieser aus der zweiten Behandlungszone abgezogene Abgasteilstrom ist dabei zusätzlich zum Wasserdampf mit weiteren verdampften Substanzen, wie z.B. verdampften Spinnund Spulölen und gegebenenfalls anderen Schadstoff-Substanzen, beladen, wobei noch ein Teil Leckluft aus dem Warenbahn-Austrittsschlitz an diesem Ende der Behandlungseinrichtung bzw. zweiten Behandlungszone hinzukommt.At the web end of the second treatment zone (generally the fixing zone), a partial exhaust gas stream is now continuously withdrawn, which is to be released into the atmosphere. This partial exhaust gas stream drawn off from the second treatment zone is in addition to water vapor with other vaporized substances, such as evaporated spinning and winding oils and possibly other pollutant substances, with some of the leakage air coming from the web exit slot at this end of the treatment device or second treatment zone.

Dieser aus der zweiten Behandlungszone abgezogene Abgasteilstrom wird dann - zunächst gleichartig wie beim Verfahren gemäß dem deutschen Patent 2 812 966 - der Verbrennungseinrichtung (Nachverbrennungseinrichtung) zugeleitet, indem er zuvor mit dem durch die Verbrennung der Schadstoffbestandteile bereits erhitzten Abgasteilstrom stark vorgewärmt worden ist. Nachdem dieser erhitzte Abgasteilstrom den direkt von der ersten Behandlungszone kommenden Abgasteilstrom vorgewärmt hat, wird er zur weiteren Erwärmung des aus der ersten Behandlungszone entnommenen Abgasstromes ausgenutzt. Bevor dieser erhitzte Abgas- teilstrom in die Atmosphäre entlassen wird, wird er jedoch zunächst noch für die Erwärmung der der Behandlungseinrichtung (an deren Warenbahn-Einlaufende) zuzuführenden Frischluft ausgenutzt. Der Abgasteilstrom aus der zweiten Behandlungszone wird daher nach seinem Erhitzen in der Verbrennungs einrichtung erfindungsgemäß nacheinander erstens zum Vorwärmen des unmittelbar aus der zweiten Behandlungszone kommenden Abgas- teilstromes, zweitens zum weiteren Erwärmen des aus der ersten Behandlungszone entnommenen Abgasstromes und drittens zum Erwärmen der der Behandlungseinrichtung neu zuzuführenden Frischluft ausgenutzt und dabei ausreichend entwärmt bzw. abgekühlt. Auf diese Weise wird die gesamte Abgasmenge der thermischen Behandlungseinrichtung im Vergleich zu bekannten Ausführungen auf etwa 50 % reduziert, indem das Abgas aus der ersten Behandlungszone ein zweites Mal (in der zweiten Behandlungszone) benutzt wird, nachdem es um ein zulässiges, geregeltes Maß weiter erwärmt worden ist. Durch dieses Anheben der Temperatur in der zweiten Behandlungszone können - wie zum Teil bereits erwähnt - keine Wasserdampfkondensationen erfolgen und das Gas ist trotz des bereits vorhandenen Wasserdampfanteiles in der Lage, die angefallenen Öldämpfe (Spinnund Spulöle aus dem Gewebe) aufzunehmen und zur thermischen Nachverbrennungseinrichtung zu transportieren. Da die Abgasmengen aus den beiden Behandlungszonen dieser Behandlungseinrichtung bei der erläuterten komtinierten Betriebsweise (als Trocknerteil und anschließendes Fixierteil) etwa gleich groß sind, läßt sich diese Verfahrensweise ohne merklichen Wirkungsgradverlust realisieren.This partial exhaust gas stream drawn off from the second treatment zone is then fed to the combustion device (post-combustion device), initially in the same way as in the process according to German patent 2 812 966, in that it has previously been preheated strongly with the exhaust gas partial stream already heated by the combustion of the pollutant components. After this heated partial exhaust gas stream has preheated the partial exhaust gas stream coming directly from the first treatment zone, it is used for further heating of the exhaust gas stream removed from the first treatment zone. Before this heated partial exhaust gas stream is released into the atmosphere, however, it is first used for heating the fresh air to be supplied to the treatment device (at the end of the web of material). The partial exhaust gas stream from the second treatment zone is therefore, after it has been heated in the combustion device, according to the invention, firstly for preheating the partial exhaust gas stream coming directly from the second treatment zone, secondly for further heating the exhaust gas stream removed from the first treatment zone and thirdly for heating the treatment device fresh air to be supplied is used and sufficiently heated or cooled. In this way, the total amount of exhaust gas from the thermal treatment device is reduced to approximately 50% compared to known designs by using the exhaust gas from the first treatment zone a second time (in the second treatment zone) after it has been heated to an admissible, regulated extent has been. By raising the temperature in the second treatment zone - as already mentioned in part - no water vapor condensation can take place and the gas is able to absorb the oil vapors (spinning and rinsing oils from the fabric) and transport them to the thermal afterburning device despite the already existing water vapor content . Since the amounts of exhaust gas from the two treatment zones of this treatment device are approximately the same in the combined operation described (as a dryer part and subsequent fixing part), this procedure can be implemented without a noticeable loss in efficiency.

Die Erfindung sei nachfolgend anhand einer bevorzugten Ausführungsform einer thermischen Behandlungseinrichtung näher beschrieben, die in der Zeichnung (eine einzige Zeichnungsfigur) in Form eines vereinfachten Blockschemas veranschaulicht ist.The invention is described in more detail below with reference to a preferred embodiment of a thermal treatment device, which is illustrated in the drawing (a single drawing figure) in the form of a simplified block diagram.

Die in der Zeichnung veranschaulichte thermische Behandlungseinrichtung enthält als eigentliche Behandlungseinrichtung für eine Wärmebehandlung einer kontinuierlich durch sie hindurchbewegten textilen Warenbahn 1 eine Spannmaschine 2, die in zwei Behandlungszonen unterteilt ist, von denen die von der Warenbahn 1 als erstes durchlaufene erste Behandlungszone einen Trocknerteil 2a und die von der Warenbahn 1 als nächstes durchlaufene zweite Wärmebehandlungszone einen Fixierteil 2b bildet. Diese Spannmaschine 2 kann in herkömmlicher Weise ausgeführt sein, d.h. sowohl der Trocknerteil 2a als auch der Fixierteil 2b kann in mehrere Behandlungsfelder unterteilt sein. Die Warenbahn 1 durchläuft diese Spannmaschine 2 in Richtung des Pfeiles 3 kontinuierlich.The thermal treatment device illustrated in the drawing contains, as the actual treatment device for a heat treatment of a textile fabric web 1 continuously moving through it, a tensioning machine 2 which is divided into two treatment zones, of which the first treatment zone first passed through the fabric web 1 includes a dryer part 2a and the second heat treatment zone passed through by the web 1 forms a fixing part 2b. This tensioning machine 2 can be implemented in a conventional manner, i.e. Both the dryer part 2a and the fixing part 2b can be divided into several treatment fields. The material web 1 passes through this tensioning machine 2 continuously in the direction of the arrow 3.

Die thermische Behandlungseinrichtung enthält ferner eine als thermische Nachverbrennungseinrichtung 4 ausgebildete Verbrennungseinrichtung, die mit einem Brenner 5, vorzugsweise einem Gasbrenner, ausgestattet sein kann. Das Warenbahn- Auslaufende 2b' ist über eine Abgasleitung 6 mit der thermischen Nachverbrennungseinrichtung 4 unter Zwischenschaltung eines ersten indirekten Wärmetauschers 7 verbunden.The thermal treatment device further contains a combustion device designed as a thermal afterburning device 4, which can be equipped with a burner 5, preferably a gas burner. The web end 2b 'is connected via an exhaust pipe 6 to the thermal afterburning device 4 with the interposition of a first indirect heat exchanger 7.

Der Spannmaschine 2 sind außer dem ersten Wärmetauscher 7 noch zwei weitere indirekte Wärmetauscher zugeordnet, nämlich ein zweiter Wärmetauscher 8 und ein dritter Wärmetauscher 9. Alle drei Wärmetauscher 7, 8, 9 sind an eine Hauptabgasleitung 10 angeschlossen, die von der thermischen Nachverbrennungseinrichtung 4 ausgeht und zu einem Kamin 11 führt und über die ein in der thermischen Nachverbrennungseinrichtung 4 erhitzter Abgasteilstrom zunächst der einen Seite des ersten Wärmetauschers 7, danach - zumindest teilweise - der einen Seite des zweiten Wärmetauschers 8 und danach - wieder zumindest teilweise - der einen Seite des dritten Wärmetauschers 9 zugeleitet wird, bevorer über den Kamin 11 in die Atmosphäre entlassen wird. Der anderen Seite des ersten Wärmetauschers 7 wird - wie bereits angedeutet - über die Abgasleitung 6 der vom Warenbahn- Auslaufende 2b' des Fixierteiles 2b kommende Abgasteilstrom zwecks Veränderung zugeführt, bevor er in die thermische Nachverbrennungseinrichtung 4 eingeleitet wird, um dort die in ihm enthaltenen Schadstoffbestandteile in üblicher Weise zu verbrennen. Der zweiten Seite des zweiten Wärmetauschers 8 wird über eine Gasleitung 12 das gesamte Abgas aus dem - in Warenbahnlaufrichtung (Pfeil 3) betrachtet - hinteren Ende 2a' des Trocknerteiles 2a zugeleitet, um dort in geregelter Weise lediglich weiter erwärmt zu werden, bevor dieser gesamte Abgasstrom als Frischgas in das - wiederum in Warenbahnlaufrichtung betrachtet - vordere Ende 2b" des Fixierteiles 2b eingeführt wird. Der in Strömungsrichtung (Pfeil 13) dem zweiten Wärmetauscher 8 nachgeordnete dritte Wärmetauscher 9 wird auf seiner anderen Seite mit Frischluft (Pfeil 14) aus dem die Behandlungseinrichtung umgebenden Raum gespeist, wobei die dadurch erwärmte Frischluft über eine Frischluftzuführleitung 15 in das WarenbahnEinlaufende 2a" des Trocknerteiles 2a und damit der Spannmaschine 2 eingeführt wird.In addition to the first heat exchanger 7, the tensioning machine 2 is also assigned two further indirect heat exchangers, namely a second heat exchanger 8 and a third heat exchanger 9. All three heat exchangers 7, 8, 9 are connected to a main exhaust gas line 10, which starts from the thermal afterburning device 4 and leads to a chimney 11 and via which an exhaust gas partial flow heated in the thermal afterburning device 4 first of the one side of the first heat exchanger 7, then - at least partially - the one side of the second heat exchanger 8 and then - again at least partially - the one side of the third heat exchanger 9 is supplied before it is released into the atmosphere via the chimney 11. The other side of the first heat exchanger 7 is - as already indicated - via the exhaust pipe 6 which is Outgoing 2b 'of the fixing part 2b coming exhaust gas stream supplied for change before it is introduced into the thermal afterburning device 4 in order to burn the pollutant components contained therein in the usual way. The second side of the second heat exchanger 8 is supplied with all of the exhaust gas from the rear end 2a 'of the dryer part 2a, as viewed in the direction of travel of the web (arrow 3), in order to be heated further in a controlled manner before this entire exhaust gas flow is introduced as fresh gas into the front end 2b "of the fixing part 2b, again viewed in the direction of the web. The third heat exchanger 9, which is arranged downstream of the second heat exchanger 8 in the direction of flow (arrow 13), is supplied with fresh air (arrow 14) from the treatment device on its other side The surrounding space is fed, the fresh air thus heated being introduced via a fresh air supply line 15 into the web end 2a "of the dryer part 2a and thus the tensioning machine 2.

In der Hauptabgasleitung 10 des erhitzten Abgas- teilstromes, d.h. in den Leitungsabschnitten dieser Hauptabgasleitung 10, die vom ersten Wärmetauscher 7 zum zweiten Wärmetauscher 8 sowie vom zweiten Wärmetauscher 8 zum dritten Wärmetauscher 9 führen, sind jeweils zwei Bypass-Regelklappen 16, 16a bzw. 17, 17a sowie je eine Bypass-Leitung 18 bzw. 19 vorgesehen, wodurch wenigstens ein Teil des erhitzten Abgasteilstromes in genau steuerbarer Weise einerseits um den zweiten Wärmetauscher 8 und andererseits um den dritten Wärmetauscher 9 im Bypass herumgelenkt werden kann. Durch diese Bypass-Einrichtungen wird es ermöglicht, die beiden Wärmetauscher 8 und 9 in genau regelbarer Weise zu betreiben, d.h. durch den zweiten Wärmetauscher 8 den gesamten Abgasstrom aus dem Trocknerteil 2a in geregelter Weise auf genau die für das Zuführen in den Fixierteil 2b geeignete Temperatur und die bei 14 dem dritten Wärmetauscher 9 zugeführte Frischluft ebenfalls in genau regelbarer Weise auf die für das Einführen in den Trocknerteil 2a geeignete Temperatur zu erwärmen.In the main exhaust line 10 of the heated partial exhaust stream, i.e. In the line sections of this main exhaust line 10, which lead from the first heat exchanger 7 to the second heat exchanger 8 and from the second heat exchanger 8 to the third heat exchanger 9, there are two bypass control flaps 16, 16a and 17, 17a and one bypass line 18 and 19 provided, whereby at least part of the heated partial exhaust gas flow can be directed in a precisely controllable manner on the one hand around the second heat exchanger 8 and on the other hand around the third heat exchanger 9 in the bypass. These bypass devices make it possible to operate the two heat exchangers 8 and 9 in a precisely controllable manner, i.e. through the second heat exchanger 8, the entire exhaust gas flow from the dryer part 2a in a controlled manner to exactly the temperature suitable for feeding into the fixing part 2b and the fresh air supplied at 14 to the third heat exchanger 9 also in a precisely controllable manner to that for introduction into the dryer part 2a to heat suitable temperature.

Die in das Warenbahn-Einlaufende 2a" in den Trocknerteil 2a einzuleitende Frischluft ist vorzugsweise auf eine Temperatur erwärmt, die etwa der Temperatur des am hinteren Ende 2a' des Trocknerteiles 2a abgezogenen Abgases entspricht. Der hier abgezogene Abgasstrom wird dann im zweiten Wärmetauscher 8 ebenfalls in genau regelbarer Weise in seiner Temperatur erhöht (zum Einführen als Frischgasmenge in den Fixierteil 2b), wobei diese erhöhte Temperatur dann etwa mit der Temperatur des am Ende dieser dieses Fixierteiles 2b abgezogenen Teilgasstromes (Leitung 6) übereinstimmt.The fresh air to be introduced into the web end 2a "into the dryer part 2a is preferably heated to a temperature which corresponds approximately to the temperature of the exhaust gas drawn off at the rear end 2a 'of the dryer part 2a. The exhaust gas stream drawn off here is then also in the second heat exchanger 8 in its temperature can be regulated in a precisely controllable manner (for introduction as a fresh gas amount into the fixing part 2b), this increased temperature then roughly corresponding to the temperature of the partial gas stream (line 6) drawn off at the end of this fixing part 2b.

In einer praktischen Durchführung dieses erfindungsgemäßen Verfahrens zum Trocknen und Fixieren der kontinuierlich bewegten textilen Warenbahn 1 sei angenommen, daß die bei 14 dem dritten Wärmetauscher 9 zugeführte Frischluft eine Umgebungstemperatur von etwa 30°C besitzt und daß diese Frischluft im dritten Wärmetauscher 9 dann auf etwa 130°C erwärmt wird. Im Trocknerteil 2a der Spannmaschine 2 besitzt der darin umgewälzte Heißgasstrom eine Temperatur von etwa 150°C. Das mit Hilfe der Abgasleitung 12 aus dem Trocknerteil 2a abgezogene Abgas besitzt wiederum eine Temperatur von etwa 130°C. Für das Einleiten dieses Abgases als Frischgas in den Fixierteil 2b der Spannmaschine 2 muß dieses Abgas bzw. dieser Abgasstrom zweckmäßig auf eine Temperatur von etwa 180°C im zweiten Wärmetauscher 8 (in geregelter Weise) weiter erwärmt werden. Im Fixierteil 2b beträgt die Temperatur des dort umgewälzten Heißgasstromes etwa 200°C, während der über die Abgasleitung 6 am WarenbahnAuslaufende 2b' abgezogene Abgasteilstrom wiederum eine Temperatur von etwa 180°C aufweist. Würde man den hier abgezogenen Abgasteilstrom mit dieser Temperatur (180°C) direkt der thermischen Nachverbrennungseinrichtung 4 zuführen, dann würde dies bedeuten, daß dieser Einrichtung 4 über ihren Brenner 5 noch ein ganz beträchtlicher zusätzlicher Teil an Wärmeenergie zugeführt werden muß, um die thermische Nachverbrennung der in diesem Teilgasstrom enthaltenen Schadstoffbestandteile bei etwa 700 bis 800°C zu verbrennen. Da jedoch der aus dem Fixierteil 2b über die Leitung 6 abgezogene Abgasteilstrom in dem ersten Wärmetauscher 7 zunächst mit Hilfe des von der Nachverbrennungseinrichtung 4 kommenden, auf etwa 700 bis 750°C erhitzten Abgasteilstrom auf etwa 550 bis 650°C, vorzugsweise etwa 600°C vorgewärmt wird, ist nur eine relativ geringe zusätzliche Wärmeenergiezufuhr über den Brenner 5 zur thermischen Nachverbrennungseinrichtung 4 erforderlich. Bei den bisher angegebenen Temperaturverhältnissen kann dann ferner davon ausgegangen werden, daß der erhitzte Abgasteilstrom den ersten Wärmetauscher 7 mit einer Temperatur von etwa 350°C verläßt, wenigstens teilweise über den zweiten Wärmetauscher 8 geleitet und dort auf etwa 320°C abgekühlt wird, bevor er den dritten Wärmetauscher 9 durchströmt und mit etwa 250°C über den Kamin 11 in die Atmosphäre entlassen wird.In a practical implementation of this method according to the invention for drying and fixing the continuously moving textile fabric web 1, it is assumed that the fresh air supplied to the third heat exchanger 9 has an ambient temperature of approximately 30 ° C. and that this fresh air in the third heat exchanger 9 then to approximately 130 ° C is heated. In the dryer part 2a of the tensioning machine 2, the hot gas flow circulated therein has a temperature of approximately 150 ° C. The exhaust gas drawn off from the dryer part 2a with the aid of the exhaust line 12 in turn has a temperature of approximately 130 ° C. For the introduction of this exhaust gas as fresh gas into the Fixing part 2b of the tensioning machine 2, this exhaust gas or this exhaust gas stream expediently has to be heated further (in a controlled manner) to a temperature of approximately 180 ° C. in the second heat exchanger 8. In the fixing part 2b, the temperature of the hot gas stream circulated there is approximately 200 ° C., while the exhaust gas partial stream drawn off via the exhaust line 6 at the end 2b ′ of the web again has a temperature of approximately 180 ° C. If one were to feed the partial exhaust gas stream withdrawn here at this temperature (180 ° C.) directly to the thermal afterburning device 4, this would mean that this device 4 still has to be supplied with a considerable additional part of thermal energy via its burner 5 in order to carry out the thermal afterburning to burn the pollutant components contained in this partial gas stream at about 700 to 800 ° C. However, since the partial exhaust gas stream drawn from the fixing part 2b via the line 6 in the first heat exchanger 7 is first heated to about 550 to 650 ° C, preferably about 600 ° C, with the help of the exhaust gas stream coming from the afterburning device 4 and heated to about 700 to 750 ° C is preheated, only a relatively small additional heat energy supply via the burner 5 to the thermal afterburning device 4 is required. At the temperature conditions specified so far, it can then also be assumed that the heated exhaust gas partial flow leaves the first heat exchanger 7 at a temperature of approximately 350 ° C., at least partially passes through the second heat exchanger 8 and is cooled there to approximately 320 ° C. before it flows through the third heat exchanger 9 and is released into the atmosphere at about 250 ° C. via the chimney 11.

Durch diese erfindungsgemäße Ausführung ist es somit im Vergleich zu bekannten Verfahren und Einrichtungen daher möglich, mit verhältnismäßig geringen Anlage- bzw. Einrichtungskosten zum einen die Gesamtabgasmenge der thermischen Behandlungseinrichtung erheblich zu verringern, nämlich um etwa die Hälfte (50 %), und dabei gleichzeitig die in die Atmosphäre abzuführende Abgasmenge (das ist der ganze aus dem Fixierteil 2b abgezogene Abgasteilstrom) praktisch ohne wesentlichen zusätzlichen Energiebedarf (trotz vorhandener thermischer Nachverbrennungseinrichtung 4) einwandfrei zu reinigen und somit die Behandlungseinrichtung insgesamt den neuen Emissionsbestimmungen gerecht zu entsorgenBy means of this embodiment according to the invention, it is therefore possible, in comparison to known methods and devices, to considerably reduce the total exhaust gas quantity of the thermal treatment device, namely by approximately half (50%), and at the same time reduce the total exhaust gas costs Exhaust gas quantity to be discharged into the atmosphere (this is the entire partial exhaust gas stream withdrawn from the fixing part 2b) can be cleaned practically without any significant additional energy requirement (despite the existing thermal afterburning device 4) and thus the treatment device as a whole must be disposed of in accordance with the new emission regulations

Claims (5)

1. Method of heat treatment, particularly drying and/or fixing, of a continuously moving length of textile material in treatment apparatus with at least two treatment zones through which the length of material flows in succession using a hot gas stream circulating in the treatment apparatus, the temperature of the hot gas stream being higher in the second treatment zone than in the first treatment zone through which the length of material passes first, in which:
a) exhaust gas is continuously drawn off from the first treatment zone, heated in a heat exchanger and introduced into the second treatment zone as fresh gas,
b) at the end of the second treatment zone an exhaust gas branch stream is drawn off and freed of the constituents of harmful substances which it contains by burning.
c) before it is discharged into the atmosphere this exhaust gas branch stream which is heated by burning is used first of all to preheat the exhaust gas branch stream to be delivered to the burning apparatus and then for heating the quantity of fresh gas to be introduced into the second treatment zone, and
d) a quantity of fresh air is delivered to the treatment apparatus at the material inlet end equivalent to the quantity of exhaust gas discharged into the atmosphere from the end of the second treatment zone,
characterised by the following features:
e) all of the exhaust gas is drawn off from the rear end - viewed in the direction in which the length of material moves - of the first treatment zone, and this exhaust gas stream is merely introduced directly into the second treatment zone after controlled further heating to a temperature suitable for delivery to the second treatment zone;
f) after heating of the exhaust gas stream from the first treatment zone, the fresh air to be delivered to the treatment apparatus is also first of all heated with the aid of the exhaust gas branch stream drawn off at the material outlet end of the second treatment zone and heated by burning the constitutents of harmful substance, before this exhaust gas branch stream is discharged into the atmosphere.
2. Method as claimed in claim 1, characterised in that the fresh air to be continuously delivered to the treatment apparatus at its material inlet end is taken from the space surrounding this treatment apparatus and heated in a controlled manner to a temperature which corresponds approximately to the temperature of the exhaust gases drawn off from the first treatment zone, whilst the higher temperature of the quantity of fresh gas introduced into the second treatment zone corresponds approximately to the temperature of the exhaust gas branch stream drawn off at the end of this second treatment zone.
3. Method as claimed in claim 2, in which the first treatment zone through which the length of material passes first is used as the drying part and the second treatment zone is used as the fixing part of the treatment apparatus, characterised in that the hot gas circulated in the drying part is in the temperature range between 100°C and 180°C, and the exhaust gas temperature is approximately 80°C to 160°C, whilst in the fixing part treatment is carried out at a temperature of approximately 170°C to 220°C, the exhaust gas temperature here being between 150°C and 210°C.
4. Method as claimed in claim 2, characterised in that before its introduction into the burning apparatus the exhaust gas branch stream drawn off at the end of the second treatment zone is heated to a temperature of at least approximately 550°C to 650°C, preferably approximately 600°C.
5. Heat treatment apparatus for carrying out the method as claimed in claim 1, containing
a) burning apparatus (4) for thermal afterburning of constituents of harmful substances carried out of the second treatment zone (2b) in the exhaust gas branch stream,
b) a first indirect heat exchanger (7) through which the exhaust gas branch stream coming from the second treatment zone flows on one side and the heated exhaust gas branch stream coming directly from the burning apparatus flows on the other side.
c) a second heat exchanger (8) which is arranged after the first heat exchanger (7) in the direction of flow (13) of the heated exhaust gas branch stream and through which this exhaust gas branch stream flows on one side and the exhaust gas stream drawn off from the first treatment zone flows on the other side,
d) pipes for fresh air, the exhaust gas stream from the first treatment zone, the exhaust gas branch stream from the second treatment zone to the burning apparatus and for the exhaust gas branch stream from the burning apparatus to the heat exchangers and for discharge into the atmosphere,
characterised by the following features:
e) a third indirect heat exchanger (9) is arranged after the second heat exchanger (8) in the direction of flow (13) of the heated exhaust gas branch stream, and this exhaust gas branch stream also flows through the third heat exchanger on one side and fresh air to be delivered to the material inlet end (2a") of the treatment apparatus flows through it on the other side;
f) bypass regulating valves (16, 16a, 17, 17a) and bypass pipes (18, 19) for partial bypassing of the second and third heat exchangers are arranged in the pipe sections of the exhaust gas stream from the first to the second heat exchangers (7, 8) and from the second to the third heat exchangers (8, 9).
EP87117916A 1986-12-23 1987-12-03 Process and apparatus for the continuous thermal treatment of a moving textile web Expired - Lifetime EP0273230B1 (en)

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AT87117916T ATE58226T1 (en) 1986-12-23 1987-12-03 METHOD AND EQUIPMENT FOR THE THERMAL TREATMENT OF A CONTINUOUSLY MOVED TEXTILE RAILWAY.

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DE3644323 1986-12-23
DE19863644323 DE3644323A1 (en) 1986-12-23 1986-12-23 METHOD AND DEVICE FOR THE THERMAL TREATMENT OF A CONTINUOUSLY MOVING TEXTILE TRACK

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EP0273230A2 EP0273230A2 (en) 1988-07-06
EP0273230A3 EP0273230A3 (en) 1989-01-04
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DE3644323A1 (en) 1988-07-07
ATE58226T1 (en) 1990-11-15
EP0273230A3 (en) 1989-01-04
US5483754A (en) 1996-01-16
DE3766085D1 (en) 1990-12-13
EP0273230A2 (en) 1988-07-06

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