EP1279763B1 - Process and device for cleaning a revolving band - Google Patents
Process and device for cleaning a revolving band Download PDFInfo
- Publication number
- EP1279763B1 EP1279763B1 EP02012016A EP02012016A EP1279763B1 EP 1279763 B1 EP1279763 B1 EP 1279763B1 EP 02012016 A EP02012016 A EP 02012016A EP 02012016 A EP02012016 A EP 02012016A EP 1279763 B1 EP1279763 B1 EP 1279763B1
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- Prior art keywords
- approximately
- pressure
- water
- high pressure
- container
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- 238000004140 cleaning Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 1
- 239000002657 fibrous material Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000013022 venting Methods 0.000 claims 1
- 239000004744 fabric Substances 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
- D21F1/325—Washing wire-cloths or felts with reciprocating devices
Definitions
- the invention relates to a method and a device for cleaning a circulating belt, in particular wire or felt belt, a paper machine.
- the water temperature was lower than 90 ° C.
- the pressure was approximately between 100 and 500 bar.
- US Pat. No. 6,143,092 discloses a method for cleaning a papermachine fabric, in which the fabric is subjected to a pressurized fluid which may have a temperature in the range from 5 ° C. to 95 ° C.
- WO 96/23101 discloses a method for cleaning a papermachine fabric, in which the fabric in the incoming nip is subjected to a pressurized fluid, which may have a temperature in the range of 40 ° C and 100 ° C.
- the aim of the invention is to provide a method and an apparatus of the type mentioned, in which, despite increased cleaning performance, a lower susceptibility and lower energy consumption is guaranteed.
- This object is achieved according to the invention by a method for cleaning a circulating belt, in particular wire or felt belt, a paper machine by means of at least one fluid jet generated by a respective nozzle, wherein the nozzle is subjected to high pressure, a temperature of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C containing water, wherein the water first pressurized and then heated to the temperature in the range of about 90 ° C to about 160 ° C.
- the cleaning device should traverse across the width of the belt.
- the resulting thermal shock better removes the dirt from the belt to be cleaned. Due to the lower viscosity of the hot water, the sieve or felt mesh concerned can be flushed through more easily and better. In particular, in the dryer section, the hot water is also optimally adapted to the process temperature. With the same water consumption results in a higher cleaning performance. The risk of occurrence of any production problems is reduced to a minimum.
- the example Production of high pressure required high-pressure pump are operated at a relatively low temperature, so that according to the pump wear is kept low. It can thus be used in particular the hitherto conventional high-pressure pumps, which are not designed for temperatures above about 50-70 ° C in the rule.
- the cleaning device can be further improved by the use of more water. This also has the consequence that more water gets into the belt to be cleaned and remains there. However, because of the relatively high temperatures, relatively much of this water also evaporates, so there is no increased rewetting on contact with the paper web. If it allows in particular the material of the tape to be cleaned, the temperature of the water used to increase the cleaning intensity can reach up to 200 ° C.
- the amount of water remaining in the belt after the cleaning device depends on the type of belt and the evaporation or evaporation distance and is approximately between 10 and 20%. While during cleaning about 40-60% of the applied water splashes back from the belt and is preferably collected by a suction device, about 30-40% of the water passes through the belt.
- the amount of water applied during the cleaning on the tape and the temperature of the water are chosen so that between the cleaning and the contact of the tape with a paper, cardboard, tissue or another fibrous web vaporize at least 50%, preferably more than 60%, in particular at least 70%, of the water present in the belt after cleaning.
- the nozzle is preferably subjected to high-pressure water, wherein the pressure can be in particular in a range of about 100 bar to about 500 bar.
- the water can be heated in particular by means of a high pressure heat exchanger.
- a heat transfer medium preferably steam taken from the steam cycle of the paper machine steam is passed into a container in which at least one high-pressure pipe is laid in particular helically, in which the standing under high pressure water is heated accordingly.
- the pressure in the container may be higher, equal to or lower than the ambient pressure. If, for example, the pressure is lower than the ambient pressure, the condensation heat of the steam can still be utilized even at temperatures below 100 ° C.
- the negative pressure in question can be generated, in particular, by a downpipe, for example, dipping into a condensate container. This is a simple way a lesser dew point reached. For example, a vacuum of 0.5 bar is needed for a dew point of 80 ° C. This is achieved, for example, by a drop tube immersed in a condensate container of 5 m height.
- the cleaning device accordingly comprises at least one respective fluid jet generating nozzle, which is pressurized, a temperature of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C having water acted upon, wherein Provision of high pressure water high-pressure pumps is provided and means are provided, through which the water on the high pressure side except for lying in the range of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C. Temperature is heated.
- the method according to the invention and the device according to the invention can advantageously be used, for example, in the dryer section of the paper machine, in which the hot water is advantageously optimally adapted to the process temperature.
- the hot water is advantageously optimally adapted to the process temperature.
- it is also an application for example in the press section and / or in the wire section of the paper machine conceivable.
- Figures 1 and 2 show a schematic partial representation of a purely exemplary embodiment of an apparatus 10 for cleaning a circulating belt used in a paper machine, which may be in particular a screen or felt belt.
- the apparatus 10 comprises at least one respective fluid jet generating nozzle 46 with associated traverse unit 47 which is pressurized with pressurized water having a temperature of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C has.
- the particular nozzle can be acted upon in particular with high-pressure water, wherein the pressure is preferably in a range of about 100 bar to about 500 bar.
- a water high pressure pump 12 may be provided.
- the high-pressure heat exchanger 14 comprises a container 16, is conducted in the heat transfer as the steam cycle of the paper machine steam removed and in which at least one high-pressure pipe 18 is laid in particular helically, in which the high-pressure water is heated accordingly.
- the pressure in the container 16 may be higher than, equal to or lower than the ambient pressure.
- the container 16 is suitably made of stainless steel.
- the temperature in the container 16 is controllable via a valve influencing the steam inlet, in particular a temperature control valve 20.
- This temperature control valve 20 may for example be a manual valve 22 upstream.
- the two valves 20, 22 associated with a steam supply line 24.
- the temperature control valve 20 is connected to a temperature control system 26, which also receives the respective actual temperature value in order to be able to act on the temperature control valve 20 in accordance with the observance of a predefinable temperature setpoint accordingly.
- the corresponding connection between the temperature control valve 20 and the temperature control system 26 is denoted by "34".
- the heated water supplying outlet 30 may be connected to the nozzle 46 to be cleaned. In principle, several such nozzles can be provided.
- a steam trap 32 may be provided, which preferably serves simultaneously as a ventilator.
- FIG. 2 shows the high-pressure heat exchanger 14 shown in FIG. 1 in a schematic plan view.
- the connection 34 between the temperature control valve 20 and the temperature control system 26 is again indicated.
- an input 36, terminal, supply line (HD water cold) or the like, and an outlet 38, port, drain (HD water hot) or the like can be seen.
- the temperature control system 26 is indicated again in this illustration.
- FIG. 3 shows a schematic representation of a general overview of a further embodiment of the cleaning device 10, in which a downpipe 42 immersed in a condensate container 40 is provided in order to in the container 16 of the high-pressure heat exchanger 14 to generate a pressure which is lower than the ambient pressure.
- the condensation heat of water vapor can be used even at temperatures below 100 ° C.
- a negative pressure of 0.5 bar which is achieved for example by a downpipe of 5 m height in a simple manner.
- the high-pressure pump 12 is again connected to the inlet 28 (see also FIG. 1) of the high-pressure heat exchanger 14.
- a high-pressure line leading to the heated fluid 44 is connected, which is again connected to the nozzle 46 or nozzles acting on the relevant web.
- a bypass 48 for the exhaust air can be provided.
Landscapes
- Paper (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Reinigen eines umlaufenden Bandes, insbesondere Sieb- oder Filzbandes, einer Papiermaschine.The invention relates to a method and a device for cleaning a circulating belt, in particular wire or felt belt, a paper machine.
Ein Verfahren sowie eine Vorrichtung dieser Art sind beispielsweise in der DE-C-195 07 938 beschrieben.A method and a device of this type are described for example in DE-C-195 07 938.
Bei dem Hochdruckreiniger der eingangs genannten Art war die Wassertemperatur geringer als 90°C. Der Druck lag etwa zwischen 100 bis 500 bar.In the high-pressure cleaner of the type mentioned, the water temperature was lower than 90 ° C. The pressure was approximately between 100 and 500 bar.
Die US 6,143,092 offenbart ein Verfahren zur Reinigung einer Papiermaschinenbespannung, bei dem die Bespannung mit einem unter Druck stehenden Fluid beaufschlagt wird, welches eine Temperatur im Bereich von 5° C bis 95° C haben kann.US Pat. No. 6,143,092 discloses a method for cleaning a papermachine fabric, in which the fabric is subjected to a pressurized fluid which may have a temperature in the range from 5 ° C. to 95 ° C.
Des weiteren offenbart die WO 96/23101 (D2) ein Verfahren zur Reinigung einer Papiermaschinenbespannung, bei dem die Bespannung im einlaufenden Nip mit einem unter Druck stehenden Fluid beaufschlagt wird, welches eine Temperatur im Bereich von 40° C und 100° C haben kann.Furthermore, WO 96/23101 (D2) discloses a method for cleaning a papermachine fabric, in which the fabric in the incoming nip is subjected to a pressurized fluid, which may have a temperature in the range of 40 ° C and 100 ° C.
Ziel der Erfindung ist es, ein Verfahren sowie eine Vorrichtung der eingangs genannten Art anzugeben, bei dem trotz erhöhter Reinigungsleistung eine geringere Störanfälligkeit und ein geringerer Energieverbrauch gewährleistet wird.The aim of the invention is to provide a method and an apparatus of the type mentioned, in which, despite increased cleaning performance, a lower susceptibility and lower energy consumption is guaranteed.
Diese Aufgabe wird nach der Erfindung gelöst durch ein Verfahren zum Reinigen eines umlaufenden Bandes, insbesondere Sieb- oder Filzbandes, einer Papiermaschine, mittels wenigstens eines durch eine jeweilige Düse erzeugten Fluidstrahles, bei dem die Düse mit unter Hochdruck stehendem, eine Temperatur von etwa 90°C bis etwa 160°C und insbesondere von etwa 100 °C bis etwa 140 °C aufweisendem Wasser beaufschlagt wird, wobei das Wasser zuerst unter Hochdruck gesetzt und anschließend bis auf die in dem Bereich von etwa 90°C bis etwa 160°C liegende Temperatur erhitzt wird. Dabei sollte die Reinigungsvorrichtung über die Breite des Bandes traversieren.This object is achieved according to the invention by a method for cleaning a circulating belt, in particular wire or felt belt, a paper machine by means of at least one fluid jet generated by a respective nozzle, wherein the nozzle is subjected to high pressure, a temperature of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C containing water, wherein the water first pressurized and then heated to the temperature in the range of about 90 ° C to about 160 ° C. The cleaning device should traverse across the width of the belt.
Durch den dabei erzeugten Temperaturschock wird der Schmutz besser von dem zu reinigenden Band abgelöst. Infolge der niedrigeren Viskosität des heißen Wassers können die betreffenden Sieb- bzw. Filzmaschen leichter und besser durchspült werden. Insbesondere in der Trockenpartie ist das heiße Wasser zudem optimal an die Prozeßtemperatur angepaßt. Bei gleichem Wasserverbrauch ergibt sich eine höhere Reinigungsleistung. Die Gefahr des Auftretens eventueller Produktionsprobleme ist auf ein Minimum reduziert.The resulting thermal shock better removes the dirt from the belt to be cleaned. Due to the lower viscosity of the hot water, the sieve or felt mesh concerned can be flushed through more easily and better. In particular, in the dryer section, the hot water is also optimally adapted to the process temperature. With the same water consumption results in a higher cleaning performance. The risk of occurrence of any production problems is reduced to a minimum.
Dadurch, dass das Wasser zuerst unter Hochdruck gesetzt wird und anschließend bis auf die in dem Bereich von etwa 90°C bis etwa 160°C und insbesondere von etwa 100°C bis etwa 140°C liegende Temperatur erhitzt wird, kann die bspw. zur Erzeugung des Hochdrucks erforderliche Hochdruckpumpe bei relativ niedriger Temperatur betrieben werden, so daß entsprechend auch der Pumpenverschleiß gering gehalten wird. Es können somit insbesondere auch die bisher üblichen Hochdruckpumpen verwendet werden, die in der Regel nicht für Temperaturen über etwa 50-70°C ausgelegt sind.The fact that the water is first pressurized and then heated to the temperature in the range of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C, the example Production of high pressure required high-pressure pump are operated at a relatively low temperature, so that according to the pump wear is kept low. It can thus be used in particular the hitherto conventional high-pressure pumps, which are not designed for temperatures above about 50-70 ° C in the rule.
Die Reinigungsvorrichtung kann durch den Einsatz von mehr Wasser weiter verbessert werden. Dies hat zwar auch zur Folge, daß mehr Wasser in das zu reinigende Band gelangt und dort verbleibt. Wegen der relativ hohen Temperaturen verdampft jedoch auch relativ viel von diesem Wasser, so daß es keine erhöhte Rückbefeuchtung beim Kontakt mit der Papierbahn gibt. Wenn es insbesondere das Material des zu reinigenden Bandes zuläßt, kann die Temperatur des eingesetzten Wassers zur Steigerung der Reinigungsintensität auch bis 200° C erreichen.The cleaning device can be further improved by the use of more water. This also has the consequence that more water gets into the belt to be cleaned and remains there. However, because of the relatively high temperatures, relatively much of this water also evaporates, so there is no increased rewetting on contact with the paper web. If it allows in particular the material of the tape to be cleaned, the temperature of the water used to increase the cleaning intensity can reach up to 200 ° C.
Die Menge des nach der Reinigungsvorrichtung im Band verbleibenden Wassers hängt von der Art des Bandes sowie der Verdampfungs- bzw. Verdunststrecke ab und liegt etwa zwischen 10 und 20 %. Während bei der Reinigung ca. 40 - 60 % des aufgebrachten Wassers vom Band zurück spritzt und vorzugsweise von einer Saugeinrichtung aufgefangen wird, gelangen ca. 30 - 40 % des Wassers durch das Band.The amount of water remaining in the belt after the cleaning device depends on the type of belt and the evaporation or evaporation distance and is approximately between 10 and 20%. While during cleaning about 40-60% of the applied water splashes back from the belt and is preferably collected by a suction device, about 30-40% of the water passes through the belt.
Im Interesse einer möglichst geringen Rückbefeuchtung ist es daher wesentlich, daß die während der Reinigung auf das Band aufgebrachte Wassermenge und die Temperatur des Wassers so gewählt werden, daß zwischen der Reinigung und dem Kontakt des Bandes mit einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn mindestens 50 % vorzugsweise mehr als 60 %, insbesondere wenigstens 70 % des nach der Reinigung im Band befindlichen Wassers verdampfen.In the interest of the lowest possible rewet, it is therefore essential that the amount of water applied during the cleaning on the tape and the temperature of the water are chosen so that between the cleaning and the contact of the tape with a paper, cardboard, tissue or another fibrous web vaporize at least 50%, preferably more than 60%, in particular at least 70%, of the water present in the belt after cleaning.
Die Düse wird vorzugsweise mit unter Hochdruck stehendem Wasser beaufschlagt, wobei der Druck insbesondere in einem Bereich von etwa 100 bar bis etwa 500 bar liegen kann.The nozzle is preferably subjected to high-pressure water, wherein the pressure can be in particular in a range of about 100 bar to about 500 bar.
Das Wasser kann insbesondere mittels eines Hochdruckwärmetauschers erhitzt werden. Dabei wird als Wärmeträger vorzugsweise dem Dampfkreislauf der Papiermaschine entnommener Dampf in einen Behälter geleitet, in dem wenigstens ein Hochdruckrohr insbesondere spiralförmig verlegt ist, in dem das unter Hochdruck stehende Wasser entsprechend erhitzt wird.The water can be heated in particular by means of a high pressure heat exchanger. In this case, as a heat transfer medium preferably steam taken from the steam cycle of the paper machine steam is passed into a container in which at least one high-pressure pipe is laid in particular helically, in which the standing under high pressure water is heated accordingly.
Der Druck in dem Behälter kann höher, gleich oder niedriger als der Umgebungsdruck sein. Ist der Druck beispielsweise geringer als der Umgebungsdruck, so kann auch noch bei Temperaturen unter 100°C die Kondensationswärme des Wasserdampfes genutzt werden.The pressure in the container may be higher, equal to or lower than the ambient pressure. If, for example, the pressure is lower than the ambient pressure, the condensation heat of the steam can still be utilized even at temperatures below 100 ° C.
Der betreffende Unterdruck kann insbesondere durch ein beispielsweise in einen Kondensatbehälter eintauchendes Fallrohr erzeugt werden. Damit ist auf einfache Art und Weise ein geringerer Taupunkt erreichbar. So benötigt man beispielsweise für einen Taupunkt von 80°C einen Unterdruck von 0,5 bar. Dies wird beispielsweise durch ein in einen Kondensatbehälter eintauchendes Fallrohr von 5 m Höhe erreicht.The negative pressure in question can be generated, in particular, by a downpipe, for example, dipping into a condensate container. This is a simple way a lesser dew point reached. For example, a vacuum of 0.5 bar is needed for a dew point of 80 ° C. This is achieved, for example, by a drop tube immersed in a condensate container of 5 m height.
Die erfindungsgemäße Reinigungsvorrichtung umfaßt entsprechend wenigstens eine einen jeweiligen Fluidstrahl erzeugende Düse, die mit unter Druck stehendem, eine Temperatur von etwa 90°C bis etwa 160°C und insbesondere von etwa 100°C bis etwa 140°C aufweisendem Wasser beaufschlagbar ist, wobei zur Erzeugung des Hochdruckes eine Wasser-Hochdruckpumpte vorgesehen ist und Mittel vorgesehen sind, durch die das Wasser auf der Hochdruckseite bis auf die in dem Bereich von etwa 90°C bis etwa 160°C und insbesondere von etwa 100°C bis etwa 140°C liegende Temperatur erhitzbar ist.The cleaning device according to the invention accordingly comprises at least one respective fluid jet generating nozzle, which is pressurized, a temperature of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C having water acted upon, wherein Provision of high pressure water high-pressure pumps is provided and means are provided, through which the water on the high pressure side except for lying in the range of about 90 ° C to about 160 ° C and in particular from about 100 ° C to about 140 ° C. Temperature is heated.
Bevorzugte Ausführungsformen der erfindungsgemäßen Vorrichtung sind in den Unteransprüchen angegeben.Preferred embodiments of the device according to the invention are specified in the subclaims.
Das erfindungsgemäße Verfahren sowie die erfindungsgemäße Vorrichtung sind mit Vorteil beispielsweise in der Trockenpartie der Papiermaschine anwendbar, in der das heiße Wasser vorteilhafterweise optimal der Prozeßtemperatur angepaßt ist. Es ist jedoch auch eine Anwendung beispielsweise in der Pressenpartie und/oder in der Siebpartie der Papiermaschine denkbar.The method according to the invention and the device according to the invention can advantageously be used, for example, in the dryer section of the paper machine, in which the hot water is advantageously optimally adapted to the process temperature. However, it is also an application for example in the press section and / or in the wire section of the paper machine conceivable.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:
- Figur 1
- eine schematische Teildarstellung einer einen Hochdruckwärmetauscher umfassenden Vorrichtung zum Reinigen eines umlaufenden Bandes einer Papiermaschine,
- Figur 2
- eine schematische Draufsicht des in der Figur 1 gezeigten Hochdruckwärmetauschers und
- Figur 3
- eine schematische Gesamtübersicht einer weiteren Ausführungsform der Reinigungsvorrichtung mit einem Fallrohr zur Erzeugung eines Unterdrucks.
- FIG. 1
- FIG. 2 a partial schematic representation of a device for cleaning a circulating belt of a paper machine comprising a high-pressure heat exchanger, FIG.
- FIG. 2
- a schematic plan view of the high-pressure heat exchanger shown in Figure 1 and
- FIG. 3
- a schematic overall view of another embodiment of the cleaning device with a downpipe for generating a negative pressure.
Die Figuren 1 und 2 zeigen in schematischer Teildarstellung eine rein beispielhafte Ausführungsform einer Vorrichtung 10 zum Reinigen eines in einer Papiermaschine eingesetzten umlaufenden Bandes, bei dem es sich insbesondere um ein Sieb- oder Filzband handeln kann.Figures 1 and 2 show a schematic partial representation of a purely exemplary embodiment of an
Die Vorrichtung 10 umfaßt wenigstens eine einen jeweiligen Fluidstrahl erzeugende Düse 46 mit zugeordneter Traversiereinheit 47, die mit unter Druck stehendem Wasser beaufschlagbar ist, das eine Temperatur von etwa 90°C bis etwa 160°C und insbesondere von etwa 100°C bis etwa 140°C aufweist.The
Dabei kann die jeweilige Düse insbesondere mit unter Hochdruck stehendem Wasser beaufschlagt werden, wobei der Druck vorzugsweise in einem Bereich von etwa 100 bar bis etwa 500 bar liegt.In this case, the particular nozzle can be acted upon in particular with high-pressure water, wherein the pressure is preferably in a range of about 100 bar to about 500 bar.
Zur Erzeugung des Hochdruckes kann insbesondere eine Wasser-Hochdruckpumpe 12 vorgesehen sein.To generate the high pressure, in particular a water
Mittels eines Hochdruckwärmetauschers 14 wird das Wasser auf der Hochdruckseite, d.h. hinter der Hochdruckpumpe 12, bis auf die in dem zuvor angegebenen Bereich liegende Temperatur erhitzt.By means of a high
Der Hochdruckwärmetauscher 14 umfaßt einen Behälter 16, in den als Wärmeträger dem Dampfkreislauf der Papiermaschine entnommener Dampf geleitet wird und in dem wenigstens ein Hochdruckrohr 18 insbesondere spiralförmig verlegt ist, in dem das unter Hochdruck stehende Wasser entsprechend erhitzt wird.The high-
Der Druck in dem Behälter 16 kann höher, gleich oder auch niedriger als der Umgebungsdruck sein.The pressure in the
Der Behälter 16 besteht zweckmäßigerweise aus Edelstahl.The
Die Temperatur im Behälter 16 ist über ein den Dampfeintritt beeinflussendes Ventil, insbesondere ein Temperaturregelventil 20, regelbar. Diesem Temperaturregelventil 20 kann beispielsweise ein Handventil 22 vorgeschaltet sein. Beim vorliegenden Ausführungsbeispiel sind die beiden Ventile 20, 22 einer Dampfzufuhrleitung 24 zugeordnet.The temperature in the
Das Temperaturregelventil 20 ist mit einem Temperatur-Kontrollsystem 26 verbunden, das auch den jeweiligen Temperatur-Istwert erhält, um das Temperaturregelventil 20 im Sinne der Einhaltung eines vorgebbaren Temperatur-Sollwertes entsprechend beaufschlagen zu können. Die entsprechende Verbindung zwischen dem Temperaturregelventil 20 und dem Temperatur-Kontrollsystem 26 ist mit "34" bezeichnet.The
Während der Einlaß 28 des Hochdruckwärmetauschers 14 mit der Wasser-Hochdruckpumpe 12 verbunden ist, kann der das erhitzte Wasser liefernde Auslaß 30 mit der das zu reinigende Band beaufschlagenden Düse 46 verbunden werden. Grundsätzlich können auch mehrere solcher Düsen vorgesehen sein.While the
Am Boden des Hochdruckwärmetauschers 14 kann ein Kondensatableiter 32 vorgesehen sein, der vorzugsweise gleichzeitig als Entlüfter dient.At the bottom of the high-
Figur 2 zeigt den in der Figur 1 dargestellten Hochdruckwärmetauscher 14 in schematischer Draufsicht. Dabei ist insbesondere auch nochmals die Verbindung 34 zwischen dem Temperaturregelventil 20 und dem Temperatur-Kontrollsystem 26 angedeutet. Überdies sind in dieser Figur 2 ein Eingang 36, Anschluß, Zuleitung (HD-Wasser kalt) oder dergleichen und ein Ausgang 38, Anschluß, Ableitung (HD-Wasser heiß) oder dergleichen zu erkennen. Auch das Temperatur-Kontrollsystem 26 ist in dieser Darstellung wieder angedeutet.FIG. 2 shows the high-
Figur 3 zeigt in schematischer Darstellung eine Gesamtübersicht einer weiteren Ausführungsform der Reinigungsvorrichtung 10, bei der ein in einen Kondensatbehälter 40 eintauchendes Fallrohr 42 vorgesehen ist, um in dem Behälter 16 des Hochdruckwärmetauschers 14 einen Druck zu erzeugen, der niedriger ist als der Umgebungsdruck. Damit kann die Kondensationswärme des Wasserdampfes auch noch bei Temperaturen unter 100°C genutzt werden. So benötigt man beispielsweise für einen Taupunkt von 80°C einen Unterdruck von 0,5 bar, was z.B. durch ein Fallrohr von 5 m Höhe auf einfache Art und Weise erreicht wird.FIG. 3 shows a schematic representation of a general overview of a further embodiment of the
Die Hochdruckpumpe 12 ist wieder mit dem Einlaß 28 (vgl. auch Figur 1) des Hochdruckwärmetauschers 14 verbunden. An den Auslaß 30 (vgl. auch Figur 1) des Hochdruckwärmetauschers 14 ist eine das erhitzte Fluid führende Hochdruckleitung 44 angeschlossen, die wieder mit der die betreffende Bahn beaufschlagenden Düse 46 bzw. Düsen verbunden ist.The high-
Wie der Figur 3 zu entnehmen ist, kann überdies beispielsweise ein Bypass 48 für die Abluft vorgesehen sein.As can be seen from FIG. 3, moreover, for example, a
Mit den zuvor beschriebenen Reinigungsvorrichtungen 10 ergibt sich eine bessere Reinigung. Das Wasser verdampft schneller, da ein Teil der notwendigen Energie schon vorhanden ist. Im Fall einer Anwendung in der Trockenpartie ergibt sich zudem der Vorteil, daß das zu reinigende Sieb nicht auskühlt. Am Absaugsystem kommt es zu keiner Kondensation. Der Schmutz löst sich in der Flüssigkeit schneller. Von Vorteil ist auch, daß das erhitzte Wasser eine niedrigere Viskosität besitzt.With the
Claims (22)
- Process for cleaning a revolving band, in particular a wire or felt band, of a paper machine by means of at least one fluid jet generated by a respective nozzle (46), wherein the nozzle (46) has pressurized water comprising a temperature of from approximately 90°C to approximately 160°C and in particular from approximately 100°C to approximately 140°C applied to it, wherein the water is first subjected to high pressure and subsequently heated up to the temperature being in the range of from approximately 90°C to approximately 160°C and in particular from approximately 100°C to approximately 140°C.
- Process according to Claim 1, characterized in that the pressure is preferably in a range of approximately 100 bar to approximately 500 bar.
- Process according to Claim 1 or 2, characterized in that the high pressure is generated by means of a high pressure pump (12).
- Process according to one of Claims 1 to 3, characterized in that the water is heated by means of a high pressure heat exchanger (14).
- Process according to Claim 4, characterized in that steam removed from the steam circuit of the paper machine is fed as heat carrier into a container (16), in which there is laid, in particular in spiral form, at least one high pressure tube (18), in which the water being held at high pressure is heated accordingly.
- Process according to Claim 5, characterized in that the pressure in the container (16) is equal to or greater than the ambient pressure.
- Process according to Claim 5, characterized in that the pressure in the container (16) is less than the ambient pressure.
- Process according to Claim 7, characterized in that the relevant reduced pressure is generated by way of a down pipe (42) immersed in particular in a condensation tank (40).
- Process according to one of the preceding Claims, characterized in that the amount of water applied on the band during the cleaning and the temperature of the water are selected such that between cleaning and the belt making contact with a paper, cardboard, tissue or another fibrous material web, at least 50%, preferably more than 60%, in particular at least 70% of the water being in the band evaporates after cleaning.
- Device (10) for cleaning a revolving band, in particular a wire or felt band, of a paper machine, comprising at least one nozzle (46) generating a respective fluid jet, which can have pressurized water comprising a temperature of from approximately 90°C to approximately 160°C and in particular from approximately 100°C to approximately 140°C applied to it, characterized in that a high pressure pump (12) is provided for generating the high pressure and means are provided by way of which the water on the high pressure side is heatable up to the temperature being in the range of from approximately 90°C to approximately 160°C and in particular from approximately 100°C to approximately 140°C.
- Device according to Claim 10, characterized in that the pressure is preferably in a range of approximately 100 bar to approximately 500 bar.
- Device according to Claim 10 or 11, characterized in that a high pressure heat exchanger (14) is provided for heating the water.
- Device according to Claim 12, characterized in that the high pressure heat exchanger (14) comprises a container (16) into which steam removed from the steam circuit of the paper machine is fed as heat carrier and in which there is laid, in particular in spiral form, at least one high pressure tube (18), in which the water being held at high pressure is heated accordingly.
- Device according to Claim 13, characterized in that the pressure in the container (16) is equal to or greater than the ambient pressure.
- Device according to Claim 13, characterized in that the pressure in the container (16) is less than the ambient pressure.
- Device according to one of the preceding Claims 13 to 15, characterized in that the container (16) is made of stainless steel.
- Device according to one of the preceding Claims 13 to 16, characterized in that the temperature in the container (16) is controllable by way of a valve, in particular a temperature control valve (20), influencing the steam intake.
- Device according to one of the preceding Claims 13 to 17, characterized in that a steam trap (32), which serves preferably simultaneously as venting means, is provided at the base of the high pressure heat exchanger (14).
- Device according to one of the preceding Claims 13 to 18, characterized in that the pressure in the container (16) is less than the ambient pressure and that a down pipe (42) immersed in particular in a condensation tank (40) is provided for generating the relevant reduced pressure.
- Use of the process and/or the device according to one of the preceding Claims in the drying section of a paper machine.
- Use of the process and/or the device according to one of the preceding Claims in the pressing section of a paper machine.
- Use of the process and/or the device according to one of the preceding Claims in the wire section of a paper machine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10136467 | 2001-07-26 | ||
| DE10136467A DE10136467A1 (en) | 2001-07-26 | 2001-07-26 | Method and device for cleaning a circulating belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1279763A1 EP1279763A1 (en) | 2003-01-29 |
| EP1279763B1 true EP1279763B1 (en) | 2006-09-13 |
Family
ID=7693199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02012016A Expired - Lifetime EP1279763B1 (en) | 2001-07-26 | 2002-05-31 | Process and device for cleaning a revolving band |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7112260B2 (en) |
| EP (1) | EP1279763B1 (en) |
| AT (1) | ATE339547T1 (en) |
| DE (2) | DE10136467A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10201840B2 (en) | 2012-04-11 | 2019-02-12 | Gpcp Ip Holdings Llc | Process for cleaning a transport belt for manufacturing a paper web |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3279976A (en) * | 1964-05-18 | 1966-10-18 | Sandy Hill Corp | Felt cleaner for paper making machines |
| US4672985A (en) * | 1985-03-18 | 1987-06-16 | Mohr Larry D | Belt cleaning apparatus |
| FI97632B (en) * | 1995-01-23 | 1996-10-15 | Ev Group Oy | Method for washing tissues, especially paper machine tissues |
| DE19507938C2 (en) * | 1995-02-24 | 1997-11-20 | Voith Sulzer Papiermasch Gmbh | Cleaning device |
| US6143092A (en) * | 1997-06-25 | 2000-11-07 | Voith Sulzer Papiermaschinen Gmbh | Process for cleaning a transport belt |
| DE19726897C2 (en) * | 1997-06-25 | 2000-01-13 | Voith Sulzer Papiermasch Gmbh | Process for cleaning a conveyor belt |
-
2001
- 2001-07-26 DE DE10136467A patent/DE10136467A1/en not_active Withdrawn
-
2002
- 2002-05-31 DE DE50208115T patent/DE50208115D1/en not_active Expired - Lifetime
- 2002-05-31 AT AT02012016T patent/ATE339547T1/en active
- 2002-05-31 EP EP02012016A patent/EP1279763B1/en not_active Expired - Lifetime
- 2002-07-03 US US10/188,094 patent/US7112260B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE339547T1 (en) | 2006-10-15 |
| US7112260B2 (en) | 2006-09-26 |
| EP1279763A1 (en) | 2003-01-29 |
| DE50208115D1 (en) | 2006-10-26 |
| DE10136467A1 (en) | 2003-02-06 |
| US20030019602A1 (en) | 2003-01-30 |
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