EP3150761A1 - Apparatus and method for drying a fibrous web with steam recovery - Google Patents
Apparatus and method for drying a fibrous web with steam recovery Download PDFInfo
- Publication number
- EP3150761A1 EP3150761A1 EP16190992.4A EP16190992A EP3150761A1 EP 3150761 A1 EP3150761 A1 EP 3150761A1 EP 16190992 A EP16190992 A EP 16190992A EP 3150761 A1 EP3150761 A1 EP 3150761A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- condensate
- pressure level
- heat exchanger
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- 238000001035 drying Methods 0.000 title description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 238000007603 infrared drying Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/20—Waste heat recovery
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/181—Drying webs by hot air on Yankee cylinder
Definitions
- the invention relates to a device for supplying a steam consumer, in particular a steam-heated cylinder, in a machine for producing or processing a fibrous web according to the preamble of claim 1, as well as a method for vapor recovery according to the preamble of claim 12.
- the Yankee cylinder uses a hot air hood to dry the web.
- the hot exhaust air of this hood is usually used again for the production of steam.
- Various methods are known from the prior art for this purpose.
- thermocompressor is usually lower than the pressure level of the live steam network.
- the inventive device for supplying a steam consumer in particular a steam-heated cylinder, preferably a Yankee cylinder in a machine for producing or processing a fibrous web, comprises a steam consumer, a steam supply which provides steam at a second pressure level for the steam consumer, and which can be connected to a live steam network is, which provides live steam at a first pressure level.
- the device comprises a condensate return line for guiding the condensate removed from the steam consumer, in particular for return to an external steam generator, for example a power plant.
- a steam generating device for at least partial evaporation of the condensate removed from the steam consumer, which comprise at least one heat exchanger, and a return feed line, which is connectable to the steam supply to feed back steam generated from the condensate in the steam supply.
- the steam supply is decoupled from the main steam network and consists essentially of a piping system without additional storage container.
- the second pressure level of the steam supply differs from the first pressure level of the live steam network.
- This device according to the invention has the significant advantage over the prior art that the pressure level of the steam supply can be optimally adapted independently of the pressure level of the live steam network of the system. Since the live steam network of the plant next to the steam consumer of the device according to the invention, so e.g. In addition to the Yankee cylinder supplies one or more other steam consumers, the pressure in this steam mains will be so high that all connected consumers can be adequately supplied. However, this first pressure level is usually higher than the pressure level which is necessary for the supply of the steam consumer and / or possible further units in the device according to the invention. In addition, the device according to the invention does without an additional vapor collection for the generated steam.
- the device additionally comprises a thermocompressor for supplying the steam consumer.
- This thermocompressor is connectable to the steam supply such that steam at the second pressure level can be used as motive steam.
- the thermocompressor can be used to steam a low pressure levels - in particular flash steam, which is obtained by relaxing the condensate removed from the steam consumer by means of the driving steam to the pressure level at which the steam is introduced into the steam consumer.
- steam is used in the steam consumer at a pressure of between 6 and 8.5 barg. The pressure can also be lower, eg at 3 barg or higher.
- thermocompressor in the steam supply, which can be selected independently of the first pressure level, and which can be tailored specifically to the requirements of the steam consumer and if available the thermocompressor.
- This second pressure level will usually differ from the first pressure level.
- the second pressure level will be lower than the first pressure level.
- the second pressure level is between 0.5 bar and 7 bar below the first pressure level, preferably between 2 bar and 4 bar below the first pressure level.
- the pressure level required by the thermocompressor as motive steam is lower than the pressure level at which the steam comes from the steam generator, or as the first pressure level, which is maintained in the live steam network.
- the second pressure level is adapted to the driving steam pressure of the thermocompressor, which is necessary to supply the steam consumer.
- the second pressure level can be selected as the minimum pressure level required for the thermocompressor.
- the steam generating device comprises in addition to a heat exchanger at least one throttle body to at least partially evaporate the condensate after passing through the at least one heat exchanger, and a separator (S2) to which the at least partially evaporated condensate can be fed, and to the the return feed line can be connected.
- the at least partial evaporation of the condensate does not take place directly in the heat exchanger.
- Such direct evaporation can optionally lead to the formation of deposits in the heat exchanger, which in turn can lead to a reduction in performance or damage to the heat exchanger.
- the cost of feedwater treatment or condensate treatment can be higher.
- the throttle body can be a valve, a diaphragm or a similar device which is suitable for at least partially evaporating the condensate after it has passed through the heat exchanger.
- the condensate is vaporized directly at the inlet of the separator (S2) or in the interior of the separator (S2).
- the separator (S2) has the function of a flash tank.
- the separator and the throttle body form a functional unit.
- the decoupling of the steam supply from the main steam network can be carried out in advantageous embodiments by means of a valve, in particular a control or throttle valve or a throttle body.
- a valve in particular a control or throttle valve or a throttle body.
- the invention is not limited to these embodiments.
- the connectivity of the two steam systems is advantageous. This can be used on the one hand for the initial filling of the steam supply and the steam consumer etc.
- the steam from the first Pressure level of the fresh steam network to the second pressure level of the steam supply relaxed.
- the required steam can also be supplied to the steam feed from the live steam network. In this case, a defined pressure level in the steam supply can be ensured by the valve or throttle member.
- the device comprises a first pressure stage, which is designed to compress condensate from the condensate return line to a third pressure level.
- This first pressure stage is generated in advantageous embodiments of the invention by a make-up pump.
- This make-up pump can advantageously be designed so that it is suitable to bring the condensate to a pressure level of at least 20 barg, more preferably at least 25 barg.
- the third pressure level will be higher in advantageous applications than the second pressure level. Often the third pressure level will be between 7.1 bar and 13 bar higher than the second pressure level. In particularly preferred embodiments, the third pressure level between 9 bar and 11 bar will be higher than the second pressure level.
- condensate can be removed from the condensate return line, which is brought by the make-up pump to the third pressure level.
- the heat exchanger can be connected to the first pressure stage in such a way that the condensate is further heated at the third pressure level in the heat exchanger. This heated condensate can then be at least partially evaporated, for example.
- the heat exchanger can be connected to an exhaust air line in such a way that the exhaust air can be used to heat the condensate.
- the exhaust air line around the exhaust air line of a drying device of a machine for producing or processing a fibrous web may be the exhaust duct of the dryer hood of the steam consumer according to the invention.
- it can be provided that it is the exhaust duct of any other aggregate, which is used in the production or processing of a fibrous web. In this case, however, in particular but not exclusively, the exhaust air line of a hot air or infrared drying of a coating system come into question.
- At least one throttle device such as a fitting, a diaphragm or the like may be provided in the device to at least partially vaporize the condensate after passing through the heat exchanger.
- the device comprises a separator (S2), to which the at least partially vaporized condensate can be fed, and to which the return feed line can be connected.
- the condensate is vaporized directly at the inlet of the separator (S2) or in the interior of the separator (S2).
- the separator (S2) has the function of a flash tank.
- the separator and the throttle body form a functional unit.
- a device can be provided, with which the separator (S2) condensate are removed, and the heat exchanger can be supplied to the evaporation.
- This device may in particular comprise suitable lines and a second pressure increasing device, which is suitable for compressing this condensate to the third pressure level.
- the condensate removed from the condensate return line can be brought together with condensate which is present in the separator (S2). is taken. From there, the condensate from the two sources can then be fed together to the heat exchanger. Often no means for increasing the pressure will be provided between the merge and the heat exchanger.
- the two condensate streams can be compressed independently of one another and brought to the third pressure level, for example. Then, at the merger, two condensate flows of the same pressure level can be mixed together.
- the device according to the invention comprises only a single steam consumer, which is connected to the steam supply.
- the advantages of the decoupling of live steam network and steam supply according to the invention are particularly strong for carrying.
- the steam supply is connected or connectable to two or more substantially identical steam consumers and / or two or more largely identical thermocompressors.
- the second pressure level can be optimally adjusted.
- steps c) and d) are separated from each other.
- the evaporation of the heated condensate is therefore not directly in the heat exchanger, but downstream, for example by means of a throttle body.
- the feeding of the steam generated in the steam supply is advantageously carried out at the second pressure level.
- the at least one heat exchanger for heating the condensate exhaust air of a drying device of a machine for producing or processing a fibrous web used in particular exhaust air of a drying hood of a drying cylinder or the exhaust duct of a hot air or infrared drying a coating unit.
- thermocompressor be used to compress steam from a low pressure level so that it can be reintroduced into the steam consumer.
- a pressure level between 6 barg and 8.5 barg is necessary in usual applications.
- lower pressure levels eg up to 3 barg
- higher pressure levels may be necessary.
- the values for the second pressure level and the third pressure level may vary depending on the application.
- the second pressure level can, as already described above, for example, be adjusted by optimal adaptation to the requirement of the thermocompressor to increase the efficiency.
- the pressure difference between the first pressure level and the second pressure level between 0.5 bar to 7 bar, in particular between 2 bar to 4 bar amount.
- the pressure difference between the second pressure level and the third pressure level may advantageously be between 7.1 bar to 13 bar, in particular between 9 bar to 11 bar.
- a separator S2 may be provided before the generated steam is fed into the steam feed.
- the steam generated is separated from the condensate.
- the steam is fed from the separator into the steam supply in this embodiment.
- the condensate is removed from this separator, compressed by means of a second pressure stage to the third pressure level, fed to the heat exchanger and then evaporated.
- the condensate removed from the separator is combined with the condensate removed from the steam consumer at a junction and fed together to the heat exchanger, wherein no further pressure increase takes place between the junction and the heat exchanger (5).
- the steam consumer 1 in FIG. 1 is exemplified as Yankee 1 executed. According to the invention, however, other steam consumers can be provided.
- an inlet 1a steam is introduced into the Yankee cylinder 1 for heating. This vapor can have a pressure level between 6 and 8.5 barg. In special applications, lower pressure levels (eg up to 3 barg) or possibly higher pressure levels may be necessary.
- an outlet 1b the Yankee cylinder 1 condensate can be removed. This condensate can be at a pressure level between 5 and 7.5 barg.
- S1 steam is generated by expansion, which is returned by means of a line (12) back to the Yankee cylinder 1.
- the resulting condensate is discharged from the first separator S1 via a condensate return line. Since the generated flash vapor has too low a pressure level, it is compressed by means of a thermocompressor 7 so far that it can be reintroduced into the Yankee cylinder.
- the motive steam required for this purpose relates to the thermocompressor from the steam feed 2.
- the steam feed 2 provides steam at a second pressure level. This second pressure level may advantageously be chosen to represent the minimum pressure level required by the thermocompressor 7 to sufficiently compress the vapor from the first separator S1. This second pressure level is usually above the pressure at which the steam is fed into the steam consumer 1. However, the required second pressure level is usually below the pressure level that provides the live steam network 10 of the system.
- the steam supply 2 is decoupled from the live steam network 10.
- This decoupling takes place in the embodiment in FIG. 1 by means of a valve 8, for example, a control or throttle valve 8.
- the decoupling can also be done by other suitable measures, for example by a throttle body.
- Essential to the decoupling is that in the steam supply 2 and the live steam network 10, the pressure can be set independently. As a rule, the second pressure level of the steam feed 2 is lower than the first pressure level of the live steam network 10.
- condensate return line 3 condensate is removed, and brought by means of a first pressure stage 4 to a third pressure level.
- This third pressure level can be, for example, 7.1 to 13 bar above the second pressure level, advantageously about 9 to 11 bar above the second pressure level.
- the absolute values of the third pressure level can lie in advantageous embodiments between 20 barg and 30 barg, in particular between 22 barg and 27 barg. However, in individual cases, the values of the third pressure level may also deviate therefrom.
- a heat exchanger 5 the condensate is heated further at the third pressure level.
- the heat exchanger 5 can be operated, for example, with the exhaust air of the Yankee cylinder 1.
- the steam is introduced via a return feed line 6 into the steam feed 2.
- the injected steam is fed in substantially at the second pressure level.
- the condensate accumulating in the second separator S2 can, as in FIG.
- the condensate return line 3 removed condensate, which is brought by the pressure increasing means 4 - usually a pump to the third pressure level, and the separator S2 removed condensate before being introduced into the heat exchanger 5.
- the merge 15 can advantageously be done before the heat exchanger 5.
- the merging 15 is preferably carried out on the pressure side of the second pump 11, that is, after the condensate has been brought from the separator S2 to the third pressure level. In this very advantageous embodiment, therefore, there is no means for increasing the pressure of the condensate between the junction 15 and the heat exchanger 5.
Landscapes
- Paper (AREA)
Abstract
Vorrichtung zur Versorgung eines Dampfverbrauchers umfassend einen Dampfverbraucher, eine Dampfzuführung, welche Dampf auf einem zweiten Druckniveau bereitstellt, und welche mit einem Frischdampfnetz verbindbar ist, welches Frischdampf auf einem ersten Druckniveau zur Verfügung stellt, eine Kondensatrückführleitung zur Führung des Kondensats, Mittel zur Verdampfung des entnommenen Kondensats, welche zumindest einen Wärmetauschers umfassen, und eine Rückspeiseleitung, um aus dem Kondensat erzeugten Dampf in die Dampfzuführung zurückzuspeisen, wobei diese Dampfzuführung (2) im Wesentlichen aus einem Leitungssystem ohne zusätzliches Speicherbehältnis besteht. Die Dampfzuführung und das Frischdampfnetz sind dabei derart entkoppelt, dass das zweite Druckniveau der Dampfzuführung sich vom ersten Druckniveau des Frischdampfnetzes unterscheidet. Verfahren zur Dampfrückgewinnung umfassend die Schritte a) Entnahme von Kondensat aus dem Dampfverbraucher b) Verdichten des Kondensats auf ein drittes Druckniveau c) Erwärmen des Kondensats auf dem dritten Druckniveau in zumindest einem Wärmetauscher, d) Verdampfen des Kondensats und Erzeugen von Dampf auf einem zweiten Druckniveau und e) Einspeisen des erzeugten Dampfes in die Dampfzuführung.Device for supplying a steam consumer comprising a Dampfverbraucher, a steam supply, which provides steam at a second pressure level, and which with a Live steam network can be connected, which provides live steam at a first pressure level, a condensate return line for guiding the condensate, means for evaporating the removed condensate, which comprise at least one heat exchanger, and a return line to feed back steam generated from the condensate in the steam supply, said steam supply (2) consists essentially of a piping system without an additional storage container , The steam supply and the live steam network are decoupled in such a way that the second pressure level of the steam supply differs from the first pressure level of the live steam network. Process for vapor recovery comprising the steps a) removal of condensate from the steam consumer b) condensing the condensate to a third pressure level c) heating the condensate at the third pressure level in at least one heat exchanger, d) evaporating the condensate and generating steam at a second pressure level and e) feeding the generated steam into the steam feed.
Description
Die Erfindung betrifft eine Vorrichtung zur Versorgung eines Dampfverbrauchers, insbesondere eines dampfbeheizten Zylinders, in einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn gemäß dem Oberbegriff von Anspruch 1, sowie ein Verfahren zur Dampfrückgewinnung gemäß dem Oberbegriff von Anspruch 12.The invention relates to a device for supplying a steam consumer, in particular a steam-heated cylinder, in a machine for producing or processing a fibrous web according to the preamble of
Bei der Herstellung oder Verarbeitung von Faserstoffbahnen werden zur Trocknung der Bahn üblicherweise dampfbeheizte Zylinder eingesetzt. Speziell bei der Herstellung von Tissuebahnen kommen vergleichsweise große Zylinder, sogenannte Yankeezylinder zum Einsatz.In the production or processing of fibrous webs usually steam-heated cylinders are used for drying the web. Particularly in the production of tissue webs, comparatively large cylinders, so-called Yankee cylinders, are used.
Zum Beheizen dieser Yankeezylinder wird Dampf auf einem bestimmten Druckniveau (Verbraucherdruck) eingesetzt. Durch den Betrieb des Zylinders kondensiert der Dampf und ein Dampf-Kondensat Gemisch wird aus dem Zylinder abgeführt. Der darin enthaltene Dampf ließe sich wieder zum Beheizen des Yankeezylinders verwenden. Jedoch weist er ein zu niedriges Druckniveau auf so dass er mittels eines Thermokompressors wieder auf den benötigten Verbraucherdruck verdichtet werden muss.To heat these Yankee cylinders, steam is used at a certain pressure level (consumer pressure). The operation of the cylinder condenses the steam and a vapor-condensate mixture is removed from the cylinder. The steam contained therein could be used again to heat the Yankee cylinder. However, it has too low a pressure level so that it must be compressed by means of a thermocompressor back to the required consumer pressure.
Zudem kommt beim Yankeezylinder eine Heißlufthaube zum Trocknen der Bahn zum Einsatz. Die heiße Abluft dieser Haube wird üblicherweise wieder zur Erzeugung von Dampf eingesetzt. Aus dem Stand der Technik sind hierzu verschiedene Verfahren bekannt.In addition, the Yankee cylinder uses a hot air hood to dry the web. The hot exhaust air of this hood is usually used again for the production of steam. Various methods are known from the prior art for this purpose.
So kann beispielsweise gemäß der
Eine weitere Möglichkeit ist es, wie in der
In der
Es ist die Aufgabe der vorliegenden Erfindung, die Schwächen des Standes der Technik zu umgehen, und speziell die erzeugte Menge an hochwertigem Treibdampf durch Abwärme Rückgewinnung zu maximieren.It is the object of the present invention to obviate the weaknesses of the prior art, and specifically to maximize the amount of high quality motive steam produced by waste heat recovery.
Diese Aufgabe wird vollständig gelöst durch eine Vorrichtung zur Versorgung eines Dampfverbrauchers, insbesondere eines dampfbeheizten Zylinders, in einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn gemäß dem Kennzeichen von Anspruch 1, sowie einem Verfahren zur Dampfrückgewinnung gemäß dem Kennzeichen von Anspruch 12.This object is fully achieved by a device for supplying a steam consumer, in particular a steam-heated cylinder, in a machine for producing or processing a fibrous web according to the characterizing part of
Die erfindungsgemäße Vorrichtung zur Versorgung eines Dampfverbrauchers, insbesondere eines dampfbeheizten Zylinders, bevorzugt eines Yankeezylinders in einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn, umfasst einen Dampfverbraucher, eine Dampfzuführung, welche Dampf auf einem zweiten Druckniveau für den Dampfverbraucher bereitstellt, und welche mit einem Frischdampfnetz verbindbar ist, welches Frischdampf auf einem ersten Druckniveau zur Verfügung stellt. Zudem umfasst die Vorrichtung eine Kondensatrückführleitung zur Führung des aus dem Dampfverbraucher entnommenen Kondensats, insbesondere zur Rückführung in einen externen Dampferzeuger z.B. ein Kraftwerk. Es ist zudem eine Dampferzeugungsvorrichtung zur wenigstens teilweisen Verdampfung des aus dem Dampfverbraucher entnommenen Kondensats vorgesehen, welche zumindest einen Wärmetauschers umfassen, sowie eine Rückspeiseleitung, welche mit der Dampfzuführung verbindbar ist, um aus dem Kondensat erzeugten Dampf in die Dampfzuführung zurückzuspeisen. Erfindungsgemäß ist vorgesehen, dass die Dampfzuführung vom Frischdampfnetz entkoppelt ist und im Wesentlichen aus einem Leitungssystem ohne zusätzliches Speicherbehältnis besteht. Zudem ist vorgesehen, dass sich das zweite Druckniveau der Dampfzuführung sich vom ersten Druckniveau des Frischdampfnetzes unterscheidet.The inventive device for supplying a steam consumer, in particular a steam-heated cylinder, preferably a Yankee cylinder in a machine for producing or processing a fibrous web, comprises a steam consumer, a steam supply which provides steam at a second pressure level for the steam consumer, and which can be connected to a live steam network is, which provides live steam at a first pressure level. In addition, the device comprises a condensate return line for guiding the condensate removed from the steam consumer, in particular for return to an external steam generator, for example a power plant. There is also provided a steam generating device for at least partial evaporation of the condensate removed from the steam consumer, which comprise at least one heat exchanger, and a return feed line, which is connectable to the steam supply to feed back steam generated from the condensate in the steam supply. According to the invention it is provided that the steam supply is decoupled from the main steam network and consists essentially of a piping system without additional storage container. In addition, it is provided that the second pressure level of the steam supply differs from the first pressure level of the live steam network.
Diese erfindungsgemäße Vorrichtung zeigt gegenüber dem Stand der Technik den wesentlichen Vorteil, dass das Druckniveau der Dampfzuführung unabhängig vom Druckniveau des Frischdampfnetzes der Anlage optimal angepasst werden kann. Da das Frischdampfnetz der Anlage neben dem Dampfverbraucher der erfindungsgemäßen Vorrichtung, also z.B. neben dem Yankeezylinder noch einen oder mehrere weitere Dampfverbraucher versorgt, wird der Druck in diesem Frischdampfnetz so hoch gewählt sein, dass damit alle angeschlossenen Verbraucher adäquat versorgt werden können. Dieses erste Druckniveau ist jedoch üblicherweise höher, als das Druckniveau, das zur Versorgung des Dampfverbrauchers und/oder möglicher weiterer Aggregate in der erfindungsgemäßen Vorrichtung notwendig ist. Zudem kommt die erfindungsgemäße Vorrichtung ohne einen zusätzlichen Dampfsammelbehälter für den erzeugten Dampf aus.This device according to the invention has the significant advantage over the prior art that the pressure level of the steam supply can be optimally adapted independently of the pressure level of the live steam network of the system. Since the live steam network of the plant next to the steam consumer of the device according to the invention, so e.g. In addition to the Yankee cylinder supplies one or more other steam consumers, the pressure in this steam mains will be so high that all connected consumers can be adequately supplied. However, this first pressure level is usually higher than the pressure level which is necessary for the supply of the steam consumer and / or possible further units in the device according to the invention. In addition, the device according to the invention does without an additional vapor collection for the generated steam.
Vorteilhafte Ausführungen der erfindungsgemäßen Vorrichtung sind in den Unteransprüchen beschrieben.Advantageous embodiments of the device according to the invention are described in the subclaims.
So kann es beispielsweise vorteilhaft sein, dass die Vorrichtung zusätzlich einen Thermokompressor zur Versorgung des Dampfverbrauchers umfasst. Dieser Thermokompressor ist mit der Dampfzuführung derart verbindbar, dass Dampf auf dem zweiten Druckniveau als Treibdampf verwendet werden kann. In bevorzugten Ausführungen kann der Thermokompressor dazu verwendet werden, Dampf eines niedrigen Druckniveaus -insbesondere Entspannungsdampf, welcher durch Entspannung des aus dem Dampfverbraucher entnommenen Kondensats entstehtmittels des Treibdampfs auf das Druckniveau zu verdichten, mit welchem der Dampf in den Dampfverbraucher eingeleitet wird. In üblichen Anwendungen wird in den Dampfverbraucher Dampf mit einem Druck zwischen 6 barg und 8.5 barg verwendet. Der Druck kann aber auch niedriger, z.B. bei 3 barg oder höher liegen.For example, it may be advantageous that the device additionally comprises a thermocompressor for supplying the steam consumer. This thermocompressor is connectable to the steam supply such that steam at the second pressure level can be used as motive steam. In preferred embodiments, the thermocompressor can be used to steam a low pressure levels - in particular flash steam, which is obtained by relaxing the condensate removed from the steam consumer by means of the driving steam to the pressure level at which the steam is introduced into the steam consumer. In common applications steam is used in the steam consumer at a pressure of between 6 and 8.5 barg. The pressure can also be lower, eg at 3 barg or higher.
Durch die erfindungsgemäße Entkopplung von Frischdampfnetz und Dampfzuführung ist es nun möglich, in der Dampfzuführung ein zweites Druckniveau vorzusehen, welches unabhängig vom ersten Druckniveau gewählt werden kann, und welches speziell auf die Anforderungen des Dampfverbrauchers und falls vorhanden des Thermokompressors abgestimmt werden kann. Dieses zweite Druckniveau wird sich üblicherweise vom ersten Druckniveau unterscheiden. In vorteilhaften Anwendungen wird das zweite Druckniveau niedriger sein, als das erste Druckniveau. Vorteilhafterweise liegt das zweite Druckniveau zwischen 0.5 bar und 7 bar unterhalb des ersten Druckniveaus, bevorzugt zwischen 2 bar und 4 bar unterhalb des ersten Druckniveaus.
Üblicherweise ist das Druckniveau, welches der Thermokompressors als Treibdampf benötigt, niedriger als das Druckniveau, mit dem der Dampf vom Dampferzeuger kommt, bzw. als das erste Druckniveau, welches im Frischdampfnetz vorgehalten wird.
Somit ist in vorteilhaften Ausführungen vorgesehen, dass das zweite Druckniveau auf den Treibdampfdruck des Thermokompressors angepasst ist, welcher zur Versorgung des Dampfverbrauchers notwendig ist. Bevorzugt kann das zweite Druckniveau als das für den Thermokompressor minimal erforderliche Druckniveau gewählt sein. Durch Wahl dieses niedrigen Druckniveaus für den Treibdampf wird naturgemäß eine größere Menge Treibdampf benötigt, als bei der Wahl eines höheren Treibdampfdrucks. Da dieser Treibdampf erfindungsgemäß zumindest teilweise durch die Dampfrückgewinnung erzeugt wird und bei niedrigem Dampfdruck mehr Kondensat in der Dampfrückgewinnung verdampfen kann, wird somit die Effizienz der Dampfrückgewinnung gesteigert. Somit kann die Wirtschaftlichkeit der Wärmerückgewinnung merklich gesteigert werden.The inventive decoupling of live steam network and steam supply, it is now possible to provide a second pressure level in the steam supply, which can be selected independently of the first pressure level, and which can be tailored specifically to the requirements of the steam consumer and if available the thermocompressor. This second pressure level will usually differ from the first pressure level. In advantageous applications, the second pressure level will be lower than the first pressure level. Advantageously, the second pressure level is between 0.5 bar and 7 bar below the first pressure level, preferably between 2 bar and 4 bar below the first pressure level.
Usually, the pressure level required by the thermocompressor as motive steam is lower than the pressure level at which the steam comes from the steam generator, or as the first pressure level, which is maintained in the live steam network.
Thus, it is provided in advantageous embodiments, that the second pressure level is adapted to the driving steam pressure of the thermocompressor, which is necessary to supply the steam consumer. Preferably, the second pressure level can be selected as the minimum pressure level required for the thermocompressor. By choosing this low pressure level for the motive steam naturally a larger amount of motive steam is required, as in the choice of a higher motive steam pressure. Since this motive steam is generated according to the invention at least partially by the vapor recovery and can evaporate more condensate in the vapor recovery at low vapor pressure, thus the efficiency of the vapor recovery is increased. Thus, the economy of heat recovery can be significantly increased.
In vorteilhaften Ausführungen der Erfindung umfasst die Dampferzeugungsvorrichtung neben einem Wärmetauscher zumindest ein Drosselorgan, um das Kondensat nach dem Durchgang durch den zumindest einen Wärmetauscher zumindest teilweise zu verdampfen, sowie einen Separator (S2), dem das zumindest teilweise verdampfte Kondensat zuführbar ist, und an den die Rückspeiseleitung anschließbar ist.
In besonders bevorzugten Ausführungen erfolgt das zumindest teilweise Verdampfen des Kondensats nicht direkt im Wärmetauscher. Ein solches direktes Verdampfen kann gegebenenfalls zur Bildung von Ablagerungen im Wärmetauscher führen, die wiederum zu einer Leistungsminderung oder auch zu einer Beschädigung des Wärmetauschers führen können. Auch kann der Aufwand zur Speisewasseraufbereitung bzw. Kondensatbehandlung höher sein.In advantageous embodiments of the invention, the steam generating device comprises in addition to a heat exchanger at least one throttle body to at least partially evaporate the condensate after passing through the at least one heat exchanger, and a separator (S2) to which the at least partially evaporated condensate can be fed, and to the the return feed line can be connected.
In particularly preferred embodiments, the at least partial evaporation of the condensate does not take place directly in the heat exchanger. Such direct evaporation can optionally lead to the formation of deposits in the heat exchanger, which in turn can lead to a reduction in performance or damage to the heat exchanger. Also, the cost of feedwater treatment or condensate treatment can be higher.
Vorteilhafterweise kann es sich bei dem Drosselorgan um eine Armatur, eine Blende oder eine ähnliche Vorrichtung handeln, die geeignet ist das Kondensat nach dem Durchgang durch den Wärmetauscher zumindest teilweise zu verdampfen.Advantageously, the throttle body can be a valve, a diaphragm or a similar device which is suitable for at least partially evaporating the condensate after it has passed through the heat exchanger.
In einer weiteren vorteilhaften Ausführung kann auch vorgesehen sein, dass das Kondensat direkt am Eingang des Separators (S2) oder im Inneren des Separators (S2) verdampft wird. In einer derartigen Ausführung kommt dem Separator (S2) die Funktion eines Entspannungstanks zu. In einer derartigen Ausführung bilden der Separator und das Drosselorgan eine funktionale Einheit.In a further advantageous embodiment, it can also be provided that the condensate is vaporized directly at the inlet of the separator (S2) or in the interior of the separator (S2). In such an embodiment, the separator (S2) has the function of a flash tank. In such an embodiment, the separator and the throttle body form a functional unit.
Die Entkopplung der Dampfzuführung vom Frischdampfnetz kann in vorteilhaften Ausführungen mittels eines Ventils, insbesondere eines Regel- oder Drosselventils oder eines Drosselorgans erfolgen. Jedoch ist die Erfindung nicht auf diese Ausführungen beschränkt.
Trotz der geschilderten Vorteile der Entkopplung von Frischdampfnetz und Dampfzuführung ist die Verbindbarkeit der beiden Dampfsysteme vorteilhaft. Diese kann einerseits zur initialen Befüllung der Dampfzuführung und des Dampfverbrauchers etc. verwendet werden. Dabei wird der Dampf vom ersten Druckniveau des Frischdampfnetzes auf das zweite Druckniveau der Dampfzuführung entspannt. Weiterhin kann auch beispielsweise im Falle eines ganzen oder teilweisen Ausfalls des Wärmetauschers der benötigte Dampf der Dampfzuführung aus dem Frischdampfnetz zugeführt werden. Hierbei kann durch das Ventil oder Drosselorgan ein definiertes Druckniveau in der Dampfzuführung sichergestellt werden.
In einer weiteren vorteilhaften Ausführung umfasst die Vorrichtung eine erste Druckstufe, welche dazu ausgestaltet ist, Kondensat aus der Kondensatrückführleitung auf ein drittes Druckniveau zu verdichten. Diese erste Druckstufe wird in vorteilhaften Ausführungen der Erfindung durch eine Nachspeisepumpe erzeugt. Diese Nachspeisepumpe kann vorteilhafterweise so ausgestaltet sein, dass sie geeignet ist, das Kondensat auf ein Druckniveau von mindestens 20 barg, besonders bevorzugt mindestens 25 barg zu bringen.The decoupling of the steam supply from the main steam network can be carried out in advantageous embodiments by means of a valve, in particular a control or throttle valve or a throttle body. However, the invention is not limited to these embodiments.
Despite the described advantages of the decoupling of live steam network and steam supply, the connectivity of the two steam systems is advantageous. This can be used on the one hand for the initial filling of the steam supply and the steam consumer etc. The steam from the first Pressure level of the fresh steam network to the second pressure level of the steam supply relaxed. Furthermore, in the case of a complete or partial failure of the heat exchanger, for example, the required steam can also be supplied to the steam feed from the live steam network. In this case, a defined pressure level in the steam supply can be ensured by the valve or throttle member.
In a further advantageous embodiment, the device comprises a first pressure stage, which is designed to compress condensate from the condensate return line to a third pressure level. This first pressure stage is generated in advantageous embodiments of the invention by a make-up pump. This make-up pump can advantageously be designed so that it is suitable to bring the condensate to a pressure level of at least 20 barg, more preferably at least 25 barg.
Das dritte Druckniveau wird in vorteilhaften Anwendungen höher sein, als das zweite Druckniveau. Häufig wird das dritte Druckniveau zwischen 7.1 bar und 13 bar höher sein, als das zweite Druckniveau. In besonders bevorzugten Ausführungen wird das dritte Druckniveau zwischen 9 bar und 11 bar höher sein, als das zweite Druckniveau. Dabei kann Kondensat aus der Kondensatrückführleitung entnommen werden, welches durch die Nachspeisepumpe auf das dritte Druckniveau gebracht wird.
In einer weiteren vorteilhaften Ausführung ist der Wärmetauscher mit der ersten Druckstufe derart verbindbar ist, dass das Kondensat auf dem dritten Druckniveau im Wärmetauscher weiter erhitzt wird. Dieses erhitzte Kondensat kann anschließend beispielsweise zumindest teilweise verdampft werden.The third pressure level will be higher in advantageous applications than the second pressure level. Often the third pressure level will be between 7.1 bar and 13 bar higher than the second pressure level. In particularly preferred embodiments, the third pressure level between 9 bar and 11 bar will be higher than the second pressure level. In this case, condensate can be removed from the condensate return line, which is brought by the make-up pump to the third pressure level.
In a further advantageous embodiment, the heat exchanger can be connected to the first pressure stage in such a way that the condensate is further heated at the third pressure level in the heat exchanger. This heated condensate can then be at least partially evaporated, for example.
In einer weiteren vorteilhaften Ausführung der Erfindung ist der Wärmetauscher derart an eine Abluftleitung anschließbar ist, dass die Abluft zur Erhitzung des Kondensat verwendet werden kann. Dabei handelt es sich in einer besonders vorteilhaften Ausführung bei der Abluftleitung um die Abluftleitung einer Trocknungseinrichtung einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn. Insbesondere kann es sich um die Abluftleitung der Trockenhaube des erfindungsgemäßen Dampfverbrauchers handeln. Es ist aber auch möglich, dass es sich um die Abluft einer Trockenhaube eines anderen Trockenzylinders handelt. Weiterhin kann vorgesehen sein, dass es sich um die Abluftleitung eines beliebigen anderen Aggregats handelt, welches im Rahmen der Herstellung oder Verarbeitung einer Faserstoffbahn verwendet wird. Hierbei kann insbesondere aber nicht ausschließlich die Abluftleitung einer Heißluft- oder Infrarottrocknung einer Streichanlage in Frage kommen.In a further advantageous embodiment of the invention, the heat exchanger can be connected to an exhaust air line in such a way that the exhaust air can be used to heat the condensate. In a particularly advantageous embodiment, in the exhaust air line around the exhaust air line of a drying device of a machine for producing or processing a fibrous web. In particular, it may be the exhaust duct of the dryer hood of the steam consumer according to the invention. But it is also possible that it is the exhaust air a drying hood of another drying cylinder acts. Furthermore, it can be provided that it is the exhaust duct of any other aggregate, which is used in the production or processing of a fibrous web. In this case, however, in particular but not exclusively, the exhaust air line of a hot air or infrared drying of a coating system come into question.
Vorteilhafterweise kann in der Vorrichtung zumindest ein Drosselorgan, wie beispielsweise eine Armatur, eine Blende oder ähnliches vorgesehen sein, um das Kondensat nach dem Durchgang durch den Wärmetauscher zumindest teilweise zu verdampfen.Advantageously, at least one throttle device, such as a fitting, a diaphragm or the like may be provided in the device to at least partially vaporize the condensate after passing through the heat exchanger.
In einer weiteren Ausführung kann vorgesehen sein, dass die Vorrichtung einen Separator (S2) umfasst, dem das zumindest teilweise verdampfte Kondensat zuführbar ist, und an den die Rückspeiseleitung anschließbar ist. In einer weiteren vorteilhaften Ausführung kann auch vorgesehen sein, dass das Kondensat direkt am Eingang des Separators (S2) oder im Inneren des Separators (S2) verdampft wird. In einer derartigen Ausführung kommt dem Separator (S2) die Funktion eines Entspannungstanks zu. In einer derartigen Ausführung bilden der Separator und das Drosselorgan eine funktionale Einheit.In a further embodiment it can be provided that the device comprises a separator (S2), to which the at least partially vaporized condensate can be fed, and to which the return feed line can be connected. In a further advantageous embodiment, it can also be provided that the condensate is vaporized directly at the inlet of the separator (S2) or in the interior of the separator (S2). In such an embodiment, the separator (S2) has the function of a flash tank. In such an embodiment, the separator and the throttle body form a functional unit.
In einer weiteren, vorteilhaften Ausführung kann eine Einrichtung vorgesehen sein, mit der dem Separator (S2) Kondensat entnommen werden, und dem Wärmetauscher zur Verdampfung zugeführt werden kann. Diese Einrichtung kann insbesondere geeignete Leitungen sowie eine zweite Drucksteigerungseinrichtung umfassen, die dazu geeignet ist, dieses Kondensat auf das dritte Druckniveau zu verdichten.In a further advantageous embodiment, a device can be provided, with which the separator (S2) condensate are removed, and the heat exchanger can be supplied to the evaporation. This device may in particular comprise suitable lines and a second pressure increasing device, which is suitable for compressing this condensate to the third pressure level.
In einer besonders vorteilhaften Ausführung kann auch eine Zusammenführung vorgesehen sein, bei der das der Kondensatrückführleitungentnommene Kondensat mit Kondensat zusammengeführt werden kann, welches dem Separator (S2) entnommen ist. Von dort kann dann das Kondensat aus den beiden Quellen gemeinsam dem Wärmetauscher zugeführt werden.
Häufig wird zwischen der Zusammenführung und dem Wärmetauscher kein Mittel zur Druckerhöhung mehr vorgesehen sein.
Mittels der ersten Drucksteigerungsvorrichtung und der zweiten Drucksteigerungsvorrichtung können die beiden Kondensatströme unabhängig voneinander verdichtet und beispielsweise auf das dritte Druckniveau gebracht werden. Dann können an der Zusammenführung zwei Kondensatsröme gleichen Druckniveaus miteinander vermischt werden.
Diese Anordnung, bei der die Zusammenführung auf der Druckseite sowohl der ersten als auch der zweiten Drucksteigerungsvorrichtungen erfolgt ist sehr flexibel. So kann beispielsweise bei Ausfall einer der beiden Pumpen zumindest mit dem anderen Teilstrom von Kondensat weiter betrieben werden. Mit einer Pumpe, die zwischen der Zusammenführung und dem Wärmetauscher installiert ist, könnte im Gegensatz dazu bei einer Havarie oder bei Wartungsarbeiten der Pumpe der Wärmetauscher gar nicht mehr betrieben werden.In a particularly advantageous embodiment, it is also possible to provide a combination in which the condensate removed from the condensate return line can be brought together with condensate which is present in the separator (S2). is taken. From there, the condensate from the two sources can then be fed together to the heat exchanger.
Often no means for increasing the pressure will be provided between the merge and the heat exchanger.
By means of the first pressure increase device and the second pressure increase device, the two condensate streams can be compressed independently of one another and brought to the third pressure level, for example. Then, at the merger, two condensate flows of the same pressure level can be mixed together.
This arrangement, in which the merging takes place on the pressure side of both the first and the second pressure increase devices is very flexible. For example, if one of the two pumps fails, at least the other partial flow of condensate can continue to be operated. By contrast, with a pump installed between the junction and the heat exchanger, the heat exchanger could no longer operate in the event of an accident or maintenance of the pump.
In einer besonders bevorzugten Ausführung umfasst die erfindungsgemäße Vorrichtung lediglich einen einzigen Dampfverbraucher, welcher mit der Dampfzuführung verbunden ist. In dieser Ausführung kommen die Vorteile der erfindungsgemäßen Entkopplung von Frischdampfnetz und Dampfzuführung besonders stark zum Tragen.
Alternativ kann beispielsweise auch vorgesehen sein, dass die Dampfzuführung mit zwei oder mehreren weitgehend identischen Dampfverbrauchern und/oder zwei oder mehreren weitgehend identischen Thermokompressoren verbunden oder verbindbar ist. Auch in diesem Fall kann das zweite Druckniveau optimal angepasst werden.In a particularly preferred embodiment, the device according to the invention comprises only a single steam consumer, which is connected to the steam supply. In this embodiment, the advantages of the decoupling of live steam network and steam supply according to the invention are particularly strong for carrying.
Alternatively, for example, it may also be provided that the steam supply is connected or connectable to two or more substantially identical steam consumers and / or two or more largely identical thermocompressors. Also in this case, the second pressure level can be optimally adjusted.
Hinsichtlich des Verfahrens wird die Aufgabe gelöst durch ein Verfahren zur Dampfrückgewinnung eines Dampfverbrauchers, insbesondere eines dampfbeheizten Zylinders, in einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn, welcher aus einer Dampfzuführung mit Dampf auf einem zweiten Druckniveau versorgt wird, wobei diese Dampfzuführung im Wesentlichen aus einem Leitungssystem ohne zusätzliches Speicherbehältnis besteht und vom Frischdampfnetz entkoppelt ist, welches Dampf auf einem ersten Druckniveau zur Verfügung stellt, wobei das Verfahren die Schritte umfasst:
- a) Entnahme von Kondensat aus dem Dampfverbraucher
- b) Verdichten des Kondensats auf ein drittes Druckniveau
- c) Erwärmen des Kondensats auf dem dritten Druckniveau in zumindest einem Wärmetauscher,
- d) Verdampfen des Kondensats und Erzeugen von Dampf auf einem zweiten Druckniveau und
- e) Einspeisen des erzeugten Dampfes in die Dampfzuführung.
- a) removal of condensate from the steam consumer
- b) condensing the condensate to a third pressure level
- c) heating the condensate at the third pressure level in at least one heat exchanger,
- d) evaporating the condensate and generating steam at a second pressure level and
- e) feeding the generated steam into the steam feed.
In einer bevorzugten Ausführung des Verfahrens sind die Schritte c) und d) voneinander getrennt. Die Verdampfung des erwärmten Kondensats erfolgt also nicht direkt im Wärmetauscher, sondern nachgelagert, beispielsweise mittels eines Drosselorgans.In a preferred embodiment of the method, steps c) and d) are separated from each other. The evaporation of the heated condensate is therefore not directly in the heat exchanger, but downstream, for example by means of a throttle body.
Die Einspeisung des erzeugten Dampfes in die Dampfzuführung erfolgt dabei vorteilhafterweise auf dem zweiten Druckniveau.The feeding of the steam generated in the steam supply is advantageously carried out at the second pressure level.
Vorteilhafte Weiterbildungen des Verfahrens werden in den Unteransprüchen beschrieben.Advantageous developments of the method are described in the subclaims.
So kann vorteilhafterweise vorgesehen sein, dass der zumindest eine Wärmetauscher zum Erwärmen des Kondensats Abluft einer Trocknungseinrichtung einer Maschine zur Herstellung oder Verarbeitung eine Faserstoffbahn verwendet, insbesondere Abluft einer Trockenhaube eines Trockenzylinders oder die Abluftleitung einer Heißluft- oder Infrarottrocknung eine Streichanlage.Thus, it may be advantageously provided that the at least one heat exchanger for heating the condensate exhaust air of a drying device of a machine for producing or processing a fibrous web used, in particular exhaust air of a drying hood of a drying cylinder or the exhaust duct of a hot air or infrared drying a coating unit.
Bevorzugt kann vorgesehen sein, dass Dampf aus der Dampfzuführung als Treibgas für einen Thermokompressor verwendet wird. Dabei kann der Thermokompressor dazu verwendet werden, Dampf von einem niedrigen Druckniveau so weit zu verdichten, dass er wieder in den Dampfverbraucher eingeleitet werden kann. Hierzu ist in üblichen Anwendungen ein Druckniveau zwischen 6 barg und 8.5 barg notwendig. In speziellen Anwendungsfällen können auch niedrigere Druckniveaus (z.B. bis zu 3 barg) oder ggf. höhere Druckniveaus notwendig sein.
Die Werte für das zweite Druckniveau und das dritte Druckniveau können je nach Anwendungsfall unterschiedlich sein. Insbesondere das zweite Druckniveau kann, wie bereits oben beschrieben, beispielsweise durch optimale Anpassung an die Anforderung des Thermokompressors, zur Steigerung der Wirtschaftlichkeit angepasst werden. In üblichen Anwendungen kann die Druckdifferenz zwischen dem ersten Druckniveau und dem zweiten Druckniveau zwischen 0.5 bar bis 7 bar, insbesondere zwischen 2 bar bis 4 bar betragen. Die Druckdifferenz zwischen dem zweiten Druckniveau und dem dritten Druckniveau kann vorteilhafterweise zwischen 7.1 bar bis 13 bar, insbesondere zwischen 9 bar bis 11 bar betragen.It can preferably be provided that steam from the steam supply is used as a propellant gas for a thermocompressor. Here, the thermocompressor be used to compress steam from a low pressure level so that it can be reintroduced into the steam consumer. For this purpose, a pressure level between 6 barg and 8.5 barg is necessary in usual applications. In special applications, lower pressure levels (eg up to 3 barg) or possibly higher pressure levels may be necessary.
The values for the second pressure level and the third pressure level may vary depending on the application. In particular, the second pressure level can, as already described above, for example, be adjusted by optimal adaptation to the requirement of the thermocompressor to increase the efficiency. In usual applications, the pressure difference between the first pressure level and the second pressure level between 0.5 bar to 7 bar, in particular between 2 bar to 4 bar amount. The pressure difference between the second pressure level and the third pressure level may advantageously be between 7.1 bar to 13 bar, in particular between 9 bar to 11 bar.
Vorteilhafterweise kann nach dem Verdampfen des Kondensats ein Separator S2 vorgesehen sein, bevor der erzeugte Dampf in die Dampfzuführung eingespeist wird. In diesem Separator wird in einer vorteilhaften Ausführung der erzeugte Dampf vom Kondensat getrennt. Der Dampf wird in dieser Ausführung aus dem Separator in die Dampfzuführung eingespeist. In einer besonders vorteilhaften Ausführung wird das Kondensat aus diesem Separator entnommen, mittels einer zweiten Druckstufe auf das dritte Druckniveau verdichtet, dem Wärmetauscher zugeführt und anschließend verdampft werden.
Weiterhin kann vorgesehen sein, dass das dem Separator entnommene Kondensat mit dem dem Dampfverbraucher entnommenen Kondensat an einer Zusammenführung zusammengeführt und gemeinsam dem Wärmetauscher zugeführt werden, wobei zwischen der Zusammenführung und dem Wärmetauscher (5) keine weitere Druckerhöhung mehr erfolgt.
Im Folgenden wird die Erfindung anhand einer Schemazeichnung näher erläutert.
Furthermore, it can be provided that the condensate removed from the separator is combined with the condensate removed from the steam consumer at a junction and fed together to the heat exchanger, wherein no further pressure increase takes place between the junction and the heat exchanger (5).
In the following the invention will be explained in more detail with reference to a schematic drawing.
Der Dampfverbraucher 1 in
Da der erzeugte Entspannungsdampf ein zu niedriges Druckniveau aufweist, wird er mittels eines Thermokompressors 7 so weit verdichtet, dass er wieder in den Yankeezylinder eingeleitet werden kann. Den dazu benötigten Treibdampf bezieht der Thermokompressor aus der Dampfzuführung 2. Die Dampfzuführung 2 stellt Dampf auf einem zweiten Druckniveau bereit. Dieses zweite Druckniveau kann vorteilhafterweise so gewählt sein, dass es das minimale Druckniveau darstellt, den der Thermokompressor 7 benötigt, um den Dampf aus dem ersten Separator S1 ausreichend zu verdichten. Dieses zweite Druckniveau liegt üblicherweise über dem Druck, mit dem der Dampf in den Dampfverbraucher 1 eingespeist wird. Jedoch liegt das benötigte zweite Druckniveau üblicherweise unter dem Druckniveau, das das Frischdampfnetz 10 der Anlage zur Verfügung stellt. Daher ist in der erfindungsgemäßen Vorrichtung die Dampfzuführung 2 vom Frischdampfnetz 10 entkoppelt. Diese Entkopplung erfolgt in der Ausführung in
Since the generated flash vapor has too low a pressure level, it is compressed by means of a
Aus dem ersten Separator S1 wird mittels einer Kondensatzrückführleitung 3 das Kondensat abgeführt. Ein Teil davon wird zurück zum Dampferzeuger 99 geleitet. Ein Teil davon kann aber dazu verwendet werden, um unter Zuhilfenahme eines Wärmetauschers 5 Dampf daraus zu erzeugen. Wenn eine große Menge Kondensats nicht an den Dampferzeuger 99 zurückgeführt, sondern direkt wieder verdampft werden kann, erhöht sich die Wirtschaftlichkeit des Prozesses erheblich. In der in
In einem Wärmetauscher 5 wird das Kondensat auf dem dritten Druckniveau weiter erhitzt. Hierbei kann der Wärmetauscher 5 beispielsweise mit der Abluft des Yankeezylinders 1 betrieben werden Jedoch ist es erfindungsgemäß möglich, alle Arten von heißer Abluft zu verwenden, die im Umfeld der Herstellung oder Verarbeitung der Faserstoffbahn anfallen. Die können z.B. Abluft aus der Strichtrocknung, Gasturbinenabluft oder andere sein. Aus dem erhitzten Kondensat wird in der in
Das im zweiten Separator S2 anfallende Kondensat kann, wie in
Wie in der
In a
The condensate accumulating in the second separator S2 can, as in
Like in the
Claims (15)
einen Dampfverbraucher (1), insbesondere einen dampfbeheizten Zylinder (1), eine Dampfzuführung (2), welche Dampf auf einem zweiten Druckniveau für den Dampfverbraucher (1) bereitstellt, und welche mit einem
Frischdampfnetz (10) verbindbar ist, welches Frischdampf auf einem ersten Druckniveau zur Verfügung stellt,
eine Kondensatrückführleitung (3) zur Führung des aus dem Dampfverbraucher (1) entnommenen Kondensats, insbesondere zur Rückführung in einen externen Dampferzeuger,
eine Dampferzeugungsvorrichtung zur wenigstens teilweisen Verdampfung des aus dem Dampfverbraucher (1) entnommenen Kondensats, welche zumindest einen Wärmetauschers (5) umfasst,
eine Rückspeiseleitung (6), welche mit der Dampfzuführung (2) verbindbar ist, um aus dem Kondensat erzeugten Dampf in die Dampfzuführung (2) zurückzuspeisen dadurch gekennzeichnet, dass
die Dampfzuführung (2) vom Frischdampfnetz (10) entkoppelt ist und im Wesentlichen aus einem Leitungssystem (2) ohne zusätzliches Speicherbehältnis besteht, und wobei das zweite Druckniveau der Dampfzuführung (2) sich vom ersten Druckniveau des Frischdampfnetzes (10) unterscheidet.Apparatus for supplying a steam consumer (1), in particular a steam-heated cylinder, in a machine for producing or processing a fibrous web, comprising
a steam consumer (1), in particular a steam-heated cylinder (1), a steam supply (2), which provides steam at a second pressure level for the steam consumer (1), and which with a
Live steam network (10) can be connected, which provides live steam at a first pressure level,
a condensate return line (3) for guiding the condensate removed from the steam consumer (1), in particular for recirculation into an external steam generator,
a steam generating device for at least partially evaporating the condensate removed from the steam consumer (1), which comprises at least one heat exchanger (5),
a return feed line (6) which is connectable to the steam feed (2) in order to feed back steam generated from the condensate into the steam feed (2), characterized in that
the steam supply (2) is decoupled from the main steam network (10) and essentially consists of a line system (2) without additional storage container, and wherein the second pressure level of the steam supply (2) differs from the first pressure level of the live steam network (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015218690 | 2015-09-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3150761A1 true EP3150761A1 (en) | 2017-04-05 |
EP3150761B1 EP3150761B1 (en) | 2018-12-12 |
Family
ID=57018048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16190992.4A Active EP3150761B1 (en) | 2015-09-29 | 2016-09-28 | Machine for producing or treating a fibrous web with a steam heated cylinder and an apparatus for supplying the cylinder with steam, and method for recovering steam from a steam heated cylinder in a machine for producing or treating a fibrous web |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3150761B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017126372A1 (en) | 2017-11-10 | 2019-05-16 | Voith Patent Gmbh | Apparatus and method for drying a fibrous web using vapor recovery |
DE102018107068A1 (en) | 2018-03-26 | 2019-09-26 | Voith Patent Gmbh | Apparatus and method for drying a fibrous web using vapor recovery |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2085514A1 (en) | 2008-01-29 | 2009-08-05 | Andritz AG | Waste heat usage in the drying section of paper machines |
EP2396469A1 (en) | 2009-02-11 | 2011-12-21 | Sca Hygiene Products AB | Device and method for drying a tissue paper web using steam recapture |
DE102011077796A1 (en) * | 2011-06-20 | 2012-12-20 | Voith Patent Gmbh | Method and system for heat recovery for a dryer section of a machine for producing a material web |
EP2775030A1 (en) | 2013-03-06 | 2014-09-10 | Valmet S.p.A. | An arrangement for drying a tissue paper web and a method for recapturing steam during drying of a tissue paper web |
-
2016
- 2016-09-28 EP EP16190992.4A patent/EP3150761B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2085514A1 (en) | 2008-01-29 | 2009-08-05 | Andritz AG | Waste heat usage in the drying section of paper machines |
EP2396469A1 (en) | 2009-02-11 | 2011-12-21 | Sca Hygiene Products AB | Device and method for drying a tissue paper web using steam recapture |
DE102011077796A1 (en) * | 2011-06-20 | 2012-12-20 | Voith Patent Gmbh | Method and system for heat recovery for a dryer section of a machine for producing a material web |
EP2775030A1 (en) | 2013-03-06 | 2014-09-10 | Valmet S.p.A. | An arrangement for drying a tissue paper web and a method for recapturing steam during drying of a tissue paper web |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017126372A1 (en) | 2017-11-10 | 2019-05-16 | Voith Patent Gmbh | Apparatus and method for drying a fibrous web using vapor recovery |
WO2019091802A1 (en) | 2017-11-10 | 2019-05-16 | Voith Patent Gmbh | Device for supplying a steam consumer and method for recovering steam from a steam consumer |
DE102018107068A1 (en) | 2018-03-26 | 2019-09-26 | Voith Patent Gmbh | Apparatus and method for drying a fibrous web using vapor recovery |
Also Published As
Publication number | Publication date |
---|---|
EP3150761B1 (en) | 2018-12-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2085514B1 (en) | Waste heat usage in the drying section of paper machines | |
DE102016214960B3 (en) | Power plant with optimized preheating of feed water for low-level turbo sets | |
EP1819909A1 (en) | Method for the operation of a steam power station, especially a steam power station of a power plant used for generating at least electric power, and corresponding steam power station | |
EP3161400A1 (en) | Method for using waste heat in a plant for producing cement and plant for producing cement | |
WO2011144366A1 (en) | Method and device for heat recovery in a drying section of a machine for producing a fibrous web | |
WO2010025999A1 (en) | Heating system for treating a fibrous material web | |
EP3150761B1 (en) | Machine for producing or treating a fibrous web with a steam heated cylinder and an apparatus for supplying the cylinder with steam, and method for recovering steam from a steam heated cylinder in a machine for producing or treating a fibrous web | |
EP3339507B1 (en) | Method for operating a heating group subsystem and heating group subsystem | |
EP3707306B1 (en) | Machine for producing or treating a fiber web and method for recycling steam of a steam user in the machine | |
AT521069B1 (en) | Apparatus and method for drying a fibrous web using vapor recovery | |
EP1426564A1 (en) | Method and device for controlling the output of a combined heat and power plant | |
WO2012175230A1 (en) | Method and system for recovering heat for a drying section of a machine for producing a material web | |
WO2014095337A2 (en) | Draining a power plant | |
DE102011077795A1 (en) | Method and system for heat recovery in a dryer section of a machine for producing a material web | |
EP2994570B1 (en) | Method for operating a heating system for a drying section of a machine for producing or treating a fibrous web, and heating system | |
EP2721213A1 (en) | Method and system for recovering heat for a drying section of a machine for producing a material web | |
WO2016188671A1 (en) | Water/steam circuit of a gas and steam turbine system | |
DE102012100645A1 (en) | Device for performing organic rankine cycle (ORC) process for generating power using waste heat obtained from industrial plant, involves providing heat exchanger with throttle for throttling condensed process fluid | |
WO2019238905A1 (en) | Operating method and control unit for a combined heat and power system, and combined heat and power system | |
DE102019117146A1 (en) | Heating group subsystem and method for operating the heating group subsystem | |
EP1706188A1 (en) | Method and device for treating contaminated water | |
EP2694629B1 (en) | Steam turbine system for a thermal power plant, and method for the operation of a steam turbine system for a thermal power plant | |
WO2011039056A1 (en) | Steam pressure controller | |
EP3204622A1 (en) | Pre-heating of untreated water in power plants | |
DE10109336A1 (en) | Process for retrofitting a steam system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20171005 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20180716 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1076119 Country of ref document: AT Kind code of ref document: T Effective date: 20181215 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 502016002785 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190312 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190312 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190313 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190412 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190412 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 502016002785 Country of ref document: DE |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
26N | No opposition filed |
Effective date: 20190913 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190930 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190928 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190930 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190928 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20190930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190930 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20200928 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20160928 Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200928 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FI Payment date: 20230920 Year of fee payment: 8 Ref country code: AT Payment date: 20230921 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20230920 Year of fee payment: 8 Ref country code: DE Payment date: 20230920 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20230927 Year of fee payment: 8 |