EP4083317A1 - Pressure sorter and dilution method for the pressure sorter - Google Patents
Pressure sorter and dilution method for the pressure sorter Download PDFInfo
- Publication number
- EP4083317A1 EP4083317A1 EP22153869.7A EP22153869A EP4083317A1 EP 4083317 A1 EP4083317 A1 EP 4083317A1 EP 22153869 A EP22153869 A EP 22153869A EP 4083317 A1 EP4083317 A1 EP 4083317A1
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- EP
- European Patent Office
- Prior art keywords
- screen
- dilution water
- reject
- amount
- reject stream
- 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.)
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/023—Stationary screen-drums
- D21D5/026—Stationary screen-drums with rotating cleaning foils
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/06—Rotary screen-drums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/16—Cylinders and plates for screens
Definitions
- the present invention relates to a dilution method for the pressure screen and a pressure screen according to the invention.
- Pressure screens with rotors and screen baskets or screen plates are often used to sort out the impurities in pulp suspensions.
- a certain thickening effect on the screen surface e.g. in the case of perforated or slotted screen baskets or perforated or slotted screen plates
- the most frequently used screens are basket-shaped screens, which are flowed through from the inside to the outside (outflow principle). This means that a rotor is arranged in the perforated or slotted screen basket, which is spaced apart from the screen surface and continuously cleans it.
- the thickening takes place over the height of the basket. Consistency normally increases with decreasing height (i.e. closer to the reject outlet). The reject thus has the highest consistency, while the accept has the lowest consistency. This is currently considered to be an undesirable effect, since not only is capacity limited, but performance and power consumption are increased. Due to the increasing consistency towards the reject outlet, fewer fibers can flow through the screen basket. In addition, the energy consumption increases due to the increased friction.
- Adding water to the screening area usually means a complicated structure. Water is generally added to the reject zone with a dilution water volume of 20% to 40% of the reject stream. Normally, when the amount of dilution water is more than 40% of the reject flow, the engine load is increased due to the limitation of the flow rate in the screening section, since the dilution water is added into the reject space located below the screening section (screen basket). In the above case, the dilution only reduces the consistency in the reject area of the pressure screen and not in the screening area between the rotor and the screen basket. In other words, when the dilution water flows to the sorting area, because of the high consistency, it is difficult for the dilution water to penetrate deeper into the sorting area to reduce the consistency there.
- FIG.2 Figure 12 shows another embodiment of a pressure screen having a device for adding dilution water.
- the dilution water is added directly to the screening section of the pressure screen, with the total amount of dilution water added to the screening section of the pressure screen being 40% to 70% of the reject stream.
- the amount of dilution water is further increased, it mainly "shoots" directly through the screen basket and ends up in the accepts zone. As a result, it is underused to reduce consistency in the sorting area. In addition, this arrangement is complicated and expensive.
- the dilution water is added to the reject zone as is already common.
- the amount of dilution water added makes the big difference here.
- a dilution water amount of more than 40% of the reject stream makes the sorting operation more difficult. Power increases, clogging and engine overload are observed.
- the applicant has found that when the amount of dilution water is still larger than the amount of reject flow, the thickening factor continues to decrease and the engine load also decreases.
- a dilution method for a pressure sorter is hereby disclosed which solves the technical problem mentioned above.
- the pressure screen includes a rotor that rotates in the screen and is spaced a certain distance from the screen.
- the supplied pulps are fed to the screening area, which is formed by the distance between the rotor and the screen. Part of the supplied stock goes through the screen into the accept zone and forms the accept.
- the remaining substances fed in are removed as a reject stream in a reject zone, with the amount of dilution water added to the reject stream being 0.8 to 3.5 times, preferably 1.6 to 2.2 times, greater than the amount of reject stream depends on the sorting stage and the material fed in.
- the reject rate is reduced. This means that smaller or fewer follow-up stages can be used, which leads to lower energy consumption and a reduction in investment costs.
- the consistency in the sorting area is lowered by the large amount of dilution water, thereby reducing the risk of clogging.
- the invention also relates to a pressure screen with a device for adding dilution water.
- the device is suitable for adding the dilution water directly into the reject zone of the pressure screen, the amount of dilution water added into the reject zone being 0.8 to 3.5 times, preferably 1.6 to 2.2 times, greater than the amount of the reject flow.
- the beneficial effect also depends on the shape of the rotor.
- structure(s) are provided on the rotor to improve the distribution of the dilution water in the screening area. It was found that ribs on the front and back of the blades of the rotor can improve the distribution of the dilution water in the screening area, allowing the rotor to operate very stably even at a reject rate below 5%.
- FIG.1 Figure 1 shows a schematic view of a cross-section of a pressure screen where the dilution water is added to the reject zone.
- FIG.2 Figure 1 shows a schematic view of a cross-section of a pressure screen where the dilution water is added to the screening zone by means of several specially designed pipelines.
- Figures 3A to 3C 12 are schematic views showing the front and back of the vanes with the ribs, respectively, and a rotor with a plurality of vanes.
- the figure 1 shows the cross section of the pressure screen 100, wherein the dilution water D is added to the reject zone 20 of the pressure screen 100, as is already the case with known pressure screens.
- the amount of Dilution water D added to the reject stream by means of an adapted device for adding dilution water is 0.8 to 3.5 times greater than the amount of the reject stream.
- figure 1 12 shows a rotor 40 rotating in the screen and spaced from the screen 60.
- the supplied substances F are fed to the sorting area 10 which is formed by the distance between the rotor 40 and the screen 60 .
- a portion of the supplied materials F goes through the screen 60 into the accepts zone 30 and forms the accepts A.
- the remaining materials F supplied are discharged in the reject zone 20 as reject stream R.
- a plurality of vanes are arranged on the rotor 40 in order to improve the flow conditions in the sorting area.
- ribs 50 are provided on the front and rear of the blades 70 of the rotor 40 to improve the distribution of the dilution water D in the screening area.
Abstract
Die vorliegende Erfindung betrifft ein Verdünnungsverfahren für einen Drucksortierer (100, 200), der einen Rotor (40) umfasst, der innerhalb des Siebes (60) rotiert und von diesem beabstandet ist, wobei der zugeführte Stoff (F) einem Sortierbereich (10) zugeführt wird, der durch den Abstand zwischen dem Rotor (40) und dem Sieb (60) gebildet wird, wobei ein Teil der zugeführten Stoffe (F) durch das Sieb (60) in die Gutstoffzone (30) gelangt und den Gutstoff (A) bildet und die restlichen zugeführten Stoffe (F) in einer Rejektzone (20) als Rejektstrom (R) abgeführt werden, wobei die Menge des in den Rejektstrom (R) zugegebenen Verdünnungswassers (D) das 0,8 bis 3,5-fache der Menge des Rejektstromes (R) beträgt. Die vorliegende Erfindung betrifft zudem einen Drucksortierer (100, 200) mit einer Vorrichtung zum Zugeben von Verdünnungswasser, die zum direkten Zugeben von Verdünnungswasser (D) in die Rejektzone (R) des Drucksortierers (100, 200) geeignet ist, wobei die Menge des in die Rejektstrom (R) zugegebenen Verdünnungswassers (D) das 0,8 bis 3,5-fache der Menge des Rejektstromes (R) beträgt.The present invention relates to a dilution method for a pressure screen (100, 200) comprising a rotor (40) rotating within and spaced from the screen (60), the feed stock (F) being fed to a screening area (10). formed by the distance between the rotor (40) and the screen (60), with part of the supplied stock (F) passing through the screen (60) into the accept zone (30) and forming the accept (A). and the remaining substances (F) supplied are removed in a reject zone (20) as reject stream (R), the amount of dilution water (D) added to the reject stream (R) being 0.8 to 3.5 times the amount of reject stream (R) is. The present invention also relates to a pressure screen (100, 200) with a device for adding dilution water, which is suitable for adding dilution water (D) directly into the reject zone (R) of the pressure screen (100, 200), the quantity of the in the reject stream (R) of added dilution water (D) is 0.8 to 3.5 times the amount of the reject stream (R).
Description
Die vorliegende Erfindung betrifft ein Verdünnungsverfahren für den Drucksortierer und einen erfindungsgemäßen Drucksortierer.The present invention relates to a dilution method for the pressure screen and a pressure screen according to the invention.
Drucksortierer mit Rotoren und Siebkörben oder Siebblechen werden häufig zum Aussortieren der Verunreinigungen in Faserstoffsuspensionen verwendet. In einem solchen Sortierverfahren gibt es eine gewisse Eindickungswirkung auf der Sieboberfläche (z.B. bei Loch- oder Schlitzsiebkörben bzw. Loch- oder Schlitzsiebblechen) wegen einer gewissen Filterwirkung. Die am häufigsten verwendeten Siebe sind korbförmige Siebe, die von innen nach außen durchströmt werden (outflow principle). Das bedeutet, dass im Loch- oder Schlitzsiebkorb ein Rotor angeordnet ist, welcher von der Sieboberfläche beabstandet ist und diese kontinuierlich reinigt.Pressure screens with rotors and screen baskets or screen plates are often used to sort out the impurities in pulp suspensions. In such a sorting process there is a certain thickening effect on the screen surface (e.g. in the case of perforated or slotted screen baskets or perforated or slotted screen plates) because of a certain filtering effect. The most frequently used screens are basket-shaped screens, which are flowed through from the inside to the outside (outflow principle). This means that a rotor is arranged in the perforated or slotted screen basket, which is spaced apart from the screen surface and continuously cleans it.
Am Markt sind die unterschiedlichsten Rotoren erhältlich. Jedoch zielen alle Rotoren auf die Erzeugung von Druck- und Saugpulsen auf der Sieboberfläche ab.A wide variety of rotors are available on the market. However, all rotors aim to generate pressure and suction pulses on the screen surface.
Die Eindickung erfolgt über die Höhe des Korbes. Normalerweise steigt die Konsistenz mit abnehmender Höhe (also näher zum Rejektauslass) an. Das Rejekt hat somit die höchste Konsistenz, während der Gutstoff die niedrigste Konsistenz hat. Dies wird gegenwärtig als ein unerwünschter Effekt angesehen, da nicht nur die Kapazität beschränkt wird, sondern die Leistung und der Energieverbrauch erhöht werden. Aufgrund der zunehmenden Konsistenz zum Rejektauslass hin können weniger Faserstoffe durch den Siebkorb hindurchfließen. Zudem erhöht sich der Energieverbrauch wegen der erhöhten Reibung.The thickening takes place over the height of the basket. Consistency normally increases with decreasing height (i.e. closer to the reject outlet). The reject thus has the highest consistency, while the accept has the lowest consistency. This is currently considered to be an undesirable effect, since not only is capacity limited, but performance and power consumption are increased. Due to the increasing consistency towards the reject outlet, fewer fibers can flow through the screen basket. In addition, the energy consumption increases due to the increased friction.
Im Stand der Technik gibt es nun Maßnahmen zur Reduzierung obengenannter Eindickung. Dazu wird entweder Verdünnungswasser in die Rejektzone zugegeben, oder es wird Verdünnungswasser in bestimmten Bereichen direkt in den Sortierbereich zugegeben.In the prior art, there are now measures to reduce the above thickening To do this, either dilution water is added to the reject zone, or dilution water is added directly to the sorting area in certain areas.
Das Zugeben von Wasser in den Sortierbereich bedeutet üblicherweise einen komplizierten Aufbau. Die Zugabe von Wasser in die Rejektzone erfolgt in der Regel mit einer Verdünnungswassermenge im Umfang von 20% bis 40 % des Rejektstroms. Wenn die Menge des Verdünnungswassers mehr als 40% des Rejektstroms beträgt, wird normalerweise die Motorbelastung wegen der Beschränkung der Durchflussmenge im Sortierbereich erhöht, da das Verdünnungswasser in den Rejektraum zugegeben wird, der unter dem Sortierbereich (Siebkorb) angeordnet ist. Im obigen Fall reduziert die Verdünnung lediglich die Konsistenz im Rejektraum des Drucksortierers und nicht im Sortierbereich zwischen dem Rotor und dem Siebkorb. Mit anderen Worten, wenn das Verdünnungswasser zum Sortierbereich fließt, fällt es dem Verdünnungswasser wegen der hohen Konsistenz schwer, tiefer in den Sortierbereich einzudringen, um dort die Konsistenz zu reduzieren. Daher ist aus Stand der Technik bekannt, dass eine Zugabe von Wasser von mehr als 40% des Rejektstroms das Verdünnungswasser hauptsächlich die "Abkürzung" zum Rejektauslass nimmt. Das heißt, das Wasser fließt in den Rejektauslass, anstatt in den Sortierbereich. Zudem tendiert eine Vielzahl von Siebkörben zur Überlastung.
Daher ist es notwendig, ein einfaches und kostengünstiges kontinuierliches Verdünnungsverfahren bereitzustellen, ohne den Sortierbetrieb dabei negativ zu beeinflussen.Therefore, there is a need to provide a simple and inexpensive continuous dilution process without adversely affecting the sorting operation.
In der vorliegenden Erfindung wird das Verdünnungswasser in die Rejektzone zugegeben, wie dies bereits üblich ist. Jedoch macht hier die Menge an zugegebenem Verdünnungswasser den großen Unterschied. Wie oben bereits beschrieben erschwert eine Verdünnungswassermenge von mehr als 40% des Rejektstroms den Sortierbetrieb. Die Leistung nimmt zu, Verstopfungen und eine Überlastung des Motors werden beobachtet. Nun hat jedoch der Anmelder in jüngsten Untersuchungen herausgefunden, dass wenn die Menge des Verdünnungswassers noch größer als die Menge des Rejektstroms ist, der Eindickungsfaktor weiterhin abnimmt und auch die Motorlast sinkt.In the present invention, the dilution water is added to the reject zone as is already common. However, the amount of dilution water added makes the big difference here. As already described above, a dilution water amount of more than 40% of the reject stream makes the sorting operation more difficult. Power increases, clogging and engine overload are observed. However, in recent investigations, the applicant has found that when the amount of dilution water is still larger than the amount of reject flow, the thickening factor continues to decrease and the engine load also decreases.
Hiermit wird ein Verdünnungsverfahren für einen Drucksortierer offenbart, welches die oben genannten technischen Problem löst. Der Drucksortierer umfasst einen Rotor, der im Sieb rotiert und in einem bestimmten Abstand vom Sieb angeordnet ist. Die zugeführten Faserstoffe werden dem Sortierbereich zugeführt, der durch den Abstand zwischen dem Rotor und dem Sieb gebildet wird. Ein Teil der zugeführten Stoffe geht durch das Sieb in die Gutstoffzone und bildet den Gutstoff. Die restlichen zugeführten Stoffe werden in einer Rejektzone als Rejektstrom abgeführt, wobei die Menge des Verdünnungswassers, das in den Rejektstrom zugegeben wird, 0,8 bis 3,5-fach, vorzugsweise 1,6 bis 2,2-fach größer als die Menge des Rejektstroms ist, abhängig von der Sortierstufe und dem zugeführten Material.A dilution method for a pressure sorter is hereby disclosed which solves the technical problem mentioned above. The pressure screen includes a rotor that rotates in the screen and is spaced a certain distance from the screen. The supplied pulps are fed to the screening area, which is formed by the distance between the rotor and the screen. Part of the supplied stock goes through the screen into the accept zone and forms the accept. The remaining substances fed in are removed as a reject stream in a reject zone, with the amount of dilution water added to the reject stream being 0.8 to 3.5 times, preferably 1.6 to 2.2 times, greater than the amount of reject stream depends on the sorting stage and the material fed in.
Auf diese Weise wird die Rejektrate reduziert. Das bedeutet, dass kleinere bzw. weniger Nachfolgestufen eingesetzt werden können, dies führt zu einem geringeren Energieverbrauch und zu einer Senkung der Investitionskosten. Außerdem wird die Konsistenz im Sortierbereich durch die große Menge von Verdünnungswasser gesenkt, wodurch das Verstopfungsrisiko verringert wird.In this way, the reject rate is reduced. This means that smaller or fewer follow-up stages can be used, which leads to lower energy consumption and a reduction in investment costs. In addition, the consistency in the sorting area is lowered by the large amount of dilution water, thereby reducing the risk of clogging.
Die Erfindung betrifft auch einen Drucksortierer mit einer Vorrichtung für die Zugabe von Verdünnungswasser. Die Vorrichtung ist dabei für die Zugabe des Verdünnungswassers direkt in die Rejektzone des Drucksortierers geeignet, wobei die Menge des in die Rejektzone zugegebenen Verdünnungswassers 0,8 bis 3,5-fach, vorzugsweise 1,6 bis 2,2-fach größer als die Menge des Rejektstroms ist.The invention also relates to a pressure screen with a device for adding dilution water. The device is suitable for adding the dilution water directly into the reject zone of the pressure screen, the amount of dilution water added into the reject zone being 0.8 to 3.5 times, preferably 1.6 to 2.2 times, greater than the amount of the reject flow.
Die vorteilhafte Wirkung ist auch von der Rotorform abhängig. In einem bevorzugten Ausführungsbeispiel der vorliegenden Erfindung sind auf dem Rotor Struktur(en) zur Verbesserung der Verteilung des Verdünnungswassers im Sortierbereich vorgesehen. Es wurde festgestellt, dass Rippen auf der Vorder- und Rückseite der Flügel des Rotors die Verteilung des Verdünnungswassers im Sortierbereich verbessern können, sodass der Rotor selbst bei einer Rejektrate von unter 5% sehr stabil betrieben werden kann.The beneficial effect also depends on the shape of the rotor. In a preferred embodiment of the present invention, structure(s) are provided on the rotor to improve the distribution of the dilution water in the screening area. It was found that ribs on the front and back of the blades of the rotor can improve the distribution of the dilution water in the screening area, allowing the rotor to operate very stably even at a reject rate below 5%.
Die
In diesem Ausführungsbeispiel gemäß
Aus
Die obige Beschreibung gibt die bevorzugten Ausführungsformen der vorliegenden Erfindung an, aber der Grundgedanke und Umfang der vorliegenden Erfindung sind nicht auf den vorliegenden offenbarten spezifischen Inhalt beschränkt. Der Fachmann auf dem vorliegenden Gebiet kann gemäß den Lehren der vorliegenden Erfindung die obigen Ausführungsformen wahlfrei kombinieren und weiterbilden, um mehr Ausführungsformen und Anwendungen im gemäß der vorliegenden Erfindung vorzunehmenThe above description indicates the preferred embodiments of the present invention, but the spirit and scope of the present invention are not limited to the specific content disclosed herein. Those skilled in the art, in accordance with the teachings of the present invention, can optionally combine and refine the above embodiments to create more embodiments and applications in accordance with the present invention to do
- 1010
- Sortierbereichsorting area
- 2020
- Rejektzonereject zone
- 3030
- Gutstoffzoneaccept zone
- 4040
- Rotorrotor
- 5050
- Ripperib
- 6060
- SiebSieve
- 7070
- Flügelwing
- 100100
- Drucksortiererpressure sorter
- 200200
- Drucksortiererpressure sorter
- Ff
- zugeführte Stoffesupplied substances
- AA
- Gutstoffaccept
- RR
- Rejektreject
- DD
- Verdünnungswasserdilution water
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202110482017.5A CN113215848B (en) | 2021-04-30 | 2021-04-30 | Pressure screen and dilution method for a pressure screen |
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EP4083317A1 true EP4083317A1 (en) | 2022-11-02 |
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EP22153869.7A Pending EP4083317A1 (en) | 2021-04-30 | 2022-01-28 | Pressure sorter and dilution method for the pressure sorter |
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US (1) | US11926961B2 (en) |
EP (1) | EP4083317A1 (en) |
CN (1) | CN113215848B (en) |
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CN111001960B (en) * | 2019-12-18 | 2021-06-11 | 安德里茨(中国)有限公司 | Yankee cylinder section pre-processing piece and method for manufacturing Yankee cylinder |
WO2023178364A2 (en) * | 2022-04-21 | 2023-09-21 | Kadant Black Clawson Llc | Rotor with forward-swept struts for pressure screen cylinders |
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- 2021-04-30 CN CN202110482017.5A patent/CN113215848B/en active Active
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- 2022-04-29 US US17/733,034 patent/US11926961B2/en active Active
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003104549A1 (en) * | 2002-06-07 | 2003-12-18 | Metso Paper, Inc | Multi-stage screening apparatus, screen basket and method for screening pulp suspensions |
DE102004039712A1 (en) * | 2004-08-17 | 2006-03-16 | Voith Paper Patent Gmbh | Reject flow control, from a used paper suspension sorting station, has a flow measurement point in front of a throttle linked to a control to set the delivery of a diluting fluid to prevent throttle blockages |
US8869989B2 (en) * | 2012-12-12 | 2014-10-28 | Ovivo Luxembourg S.Å.R.L. | Pulp screen rotor with slurry passages around and through the rotor |
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CN113215848A (en) | 2021-08-06 |
US20220349124A1 (en) | 2022-11-03 |
US11926961B2 (en) | 2024-03-12 |
CN113215848B (en) | 2023-05-26 |
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