WO2010130493A1 - Konstantteil - Google Patents
Konstantteil Download PDFInfo
- Publication number
- WO2010130493A1 WO2010130493A1 PCT/EP2010/053686 EP2010053686W WO2010130493A1 WO 2010130493 A1 WO2010130493 A1 WO 2010130493A1 EP 2010053686 W EP2010053686 W EP 2010053686W WO 2010130493 A1 WO2010130493 A1 WO 2010130493A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dilution
- pulp suspension
- degassing
- white water
- dilution device
- Prior art date
Links
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
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- 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
- D21D5/26—De-aeration of paper stock
Definitions
- the invention relates to an arrangement for feeding a pulp suspension to at least one headbox of a paper or board machine with at least one dilution device, in which the pulp suspension is produced by mixing a thick stock suspension with a dilution liquid, wherein the dilution liquid is at least partially formed by white water of the paper or board machine , Pre-degassed white water in at least one open channel and then passed through a degassing device in a dilution device.
- Slum has e.g. a typical consistency between 2.5 and 5%.
- dilution liquid in particular white water of the paper machine
- the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine.
- the white water is optimally suitable for this dilution task, but there are problems because of the high gas content, the majority being air.
- this object is achieved in that the potential energy of the pulp suspension in the groove is not above the potential energy of the pulp suspension in the dilution device and the pressure at the outlet of the degassing between -0.3 and 1 bar or that the potential energy of the pulp suspension in the trough is above the potential energy of the pulp suspension in the diluter.
- the difference in the potential energy of the pulp suspension in the channel is higher than in the dilution device, then a pump between the units can be dispensed with, which considerably reduces the expense.
- the difference of the potential energy essentially determines the throughput of pulp suspension. If the difference in the potential energy is too large, then an overpressure must be reduced via throttles or the degassing device, which is not energetically advantageous. Therefore, the difference in the potential energy of the pulp suspension in the gutter and the dilution device should correspond to at most one equivalent of 8 m height difference.
- the degassing device must be arranged and / or designed such that a pressure of between -0.3 and 1 bar is established at its outlet.
- the pressure at the outlet of the degasser should advantageously be above the pressure at the inlet of the diluter so that the pressure differential provides for transport of the pulp suspension between these elements.
- the outlet of the degassing device is arranged above the inlet of the white water in the dilution device. In this way, the flow of white water from the degassing to the dilution device can be done entirely without conveying elements.
- the pressure at the outlet of the degassing device should be at most 0.5 bar below the pressure at the inlet of the dilution device.
- a small pump between the degassing device and dilution device can take over the transport of the pulp suspension.
- the flow of the pulp suspension between the channel and the degassing device and / or between the degassing device and the dilution device should preferably be throttled variably.
- the inlet of the degassing device is arranged above the channel.
- the degassing device should be connected to a vacuum source.
- Particularly suitable degassing devices with a rotating rotor in the interior of the white water is guided, wherein the centrally collected by the centrifugal forces gas is sucked from the vacuum source.
- the dilution device can be closed or open - A -
- the pulp suspension should, if possible, be fed to the headbox via a fuel pump in a closed system.
- the liquid level in the degassing device drops to that of the dilution device.
- the fuel pump should be started before starting the degassing.
- the method is particularly favorable for paper machines whose sieve speed is between 800 and 1600 m / min, since the amount of air contained in the white water strongly depends on the sieving speed.
- a pulp suspension 1 is produced in the usual way by mixing a thick stock suspension 6 with a dilution liquid and then has substantially the desired consistency for the operation of the headbox 8 of the paper or board machine at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%.
- the dilution liquid which is supplied in a dilution device 5 originates from the first white water 2, that is to say the water accumulated in the forming area 10 of the paper or board machine. It is often referred to as white water I in contrast to the later incurred on the paper machine second white water II, which contains much less fines.
- the degassing device 4 is constructed as a cylindrical or conical container and according to the invention provided with a rotor 13.
- the pulp suspension 1 enters the substantially cylindrical interior 14 of the rotor 13 and is set in rapid rotation. This principle corresponds to that of a solid bowl centrifuge.
- the gases contained move inwardly as a result of the centrifugal forces and are sucked out of the center via a vacuum source 7.
- the centrifugal forces may be at least 5 times, preferably 10 times the gravitational acceleration.
- the vacuum source 7 requires no negative pressure, the
- Vapor pressure of the suspension is equal to or in the vicinity. Typical values for the negative pressure are 0.8 to 0.9 bar.
- the inlet 16 of the degassing device 4 may be arranged centric or eccentric. The liquid added by him is first in
- the gas can be sucked by means of the vacuum source 7.
- the wall of the rotor 13 is made liquid-permeable, e.g. by attaching openings in this area.
- the spout 15 is advantageously mounted tangentially in such a way that the
- Rotational flow of the degassed liquid to a pressure build-up in the outlet 15 leads.
- the openings in the wall of the rotor 13 are so large that they do not come to a Sorting the degassed liquid lead.
- the degassing device 4 can additionally be provided with an outer sorting basket, via which the screen water 2 pressed radially outward can be divided into accepts and rejects.
- the degassed white water 2 is fed via the outlet 15 of the degassing device 4 directly into the dilution device 5, which is designed here as an open container. Because of the much lower solids content of the white water 2 compared to the pulp suspension 1, the degassing can be performed easily. However, this requires at most only a small gas content of the diluent suspension 6 added in the dilution device 5 in order to avoid quality losses.
- a dilution device 5 is particularly suitable described in DE 100 50 109 mixing device. It is essential in this case that the mixing of the streams takes place via an injection of the thick stock suspension 6 into the white water 2, the entry speed of the thick stock suspension 6 preferably being 3 to 15 times the flow rate of the white water 2.
- the headbox 8 is supplied not only with the already mentioned pulp suspension 1, but in addition with a dilution liquid, which is seen over the width of the headbox 1 is added at different points. This allows e.g. influence the cross profile of the fibrous layer formed with the headbox 8, in particular optimize.
- a last sorting stage 18 is often connected in front of the headbox 8 in order to prevent contaminants from entering it, which disturb the operation of the headbox 8 or the paper machine.
- This sorting function may also be performed in combination with the degassing function as described above in the same apparatus.
- the pulp suspension 1 After leaving the dilution device 5, the pulp suspension 1 via a fuel pump 9 in a closed system (ie without open containers or laid paper) via a cleaner 11, a further pump 12 and the sorting stage 18 to the headbox 8 out.
- a fuel pump 9 in a closed system (ie without open containers or laid paper) via a cleaner 11, a further pump 12 and the sorting stage 18 to the headbox 8 out.
- the potential energy of the pulp suspension 1 in the channel 3 is here above the potential energy of the pulp suspension 1 in the dilution device 5.
- the potential energy of the pulp suspension 1 in the channel 3 is here above the potential energy of the pulp suspension 1 in the dilution device 5.
- the energy difference should also not be too large, since the energy surplus otherwise has to be reduced via adjustable throttle elements 21, 22 in the form of valves.
- the pressure at the outlet 15 of the degassing device 4 is above the pressure at the inlet 19 of the dilution device 5.
- the outlet 15 of the degassing device 4 is above the inlet 19 of the white water 2 arranged in the dilution device 5.
- the liquid level in the degassing 4 lowers to the liquid level in the dilution device 5, which is why the necessary for the transport of the white water 2 level difference before startup of the degassing device 4 must be recreated. This is achievable by the liquid level is lowered in the VerPêtsvorhchtung 5 before starting the degassing device 4 with the fuel pump 9 to the required level.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI1007639-5A BRPI1007639A2 (pt) | 2009-05-12 | 2010-03-22 | "arranjo para a alimentação de uma suspensão de material fibroso" |
CA2761661A CA2761661A1 (en) | 2009-05-12 | 2010-03-22 | Approach system |
EP10709733A EP2430234A1 (de) | 2009-05-12 | 2010-03-22 | Konstantteil |
CN2010800210207A CN102421962A (zh) | 2009-05-12 | 2010-03-22 | 上浆流送*** |
US13/319,929 US20120048495A1 (en) | 2009-05-12 | 2010-03-22 | Approach flow system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009020949A DE102009020949A1 (de) | 2009-05-12 | 2009-05-12 | Konstantteil |
DE102009020949.2 | 2009-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010130493A1 true WO2010130493A1 (de) | 2010-11-18 |
Family
ID=42224439
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/053686 WO2010130493A1 (de) | 2009-05-12 | 2010-03-22 | Konstantteil |
Country Status (7)
Country | Link |
---|---|
US (1) | US20120048495A1 (de) |
EP (1) | EP2430234A1 (de) |
CN (1) | CN102421962A (de) |
BR (1) | BRPI1007639A2 (de) |
CA (1) | CA2761661A1 (de) |
DE (2) | DE102009020949A1 (de) |
WO (1) | WO2010130493A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI125818B (fi) * | 2009-06-08 | 2016-02-29 | Upm Kymmene Corp | Menetelmä paperin valmistamiseksi |
FI121890B (fi) * | 2009-06-08 | 2011-05-31 | Upm Kymmene Corp | Uudentyyppinen paperi ja menetelmä sen valmistamiseksi |
DE102012212529A1 (de) * | 2012-07-18 | 2014-01-23 | Voith Patent Gmbh | Sicherheitspapier-Konstantteil |
CN103669086A (zh) * | 2012-09-10 | 2014-03-26 | 上海东冠纸业有限公司 | 一种低能耗的纸机浓白水池管路*** |
DE102014004477A1 (de) * | 2014-03-28 | 2015-10-01 | All Farhan Bhola | "Vorrichtung zur Regelung des Drucks in einem Rohrnetz zur Aufnahme von Flüssigkeit" |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10050109A1 (de) | 2000-10-09 | 2002-04-11 | Voith Paper Patent Gmbh | Verfahren und Mischvorrichtung zur Erzeugung einer fertigen Faserstoffsuspension |
DE102004051327A1 (de) | 2004-10-21 | 2006-05-04 | Voith Paper Patent Gmbh | Verfahren zur Entgasung und Zuführung einer Faserstoffsuspension zu einem Stoffauflauf sowie Entgasungsvorrichtung |
WO2008119872A1 (en) * | 2007-04-03 | 2008-10-09 | Andritz Oy | An apparatus for removing gas in connection with a paper machine or corresponding |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19952129A1 (de) * | 1999-10-29 | 2001-05-03 | Voith Paper Patent Gmbh | Verfahren und Vorrichtung zur Entgasung einer Papierstoffsuspension |
DE10337944A1 (de) * | 2003-08-19 | 2005-03-17 | Voith Paper Patent Gmbh | Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf |
DE102006027596A1 (de) * | 2006-06-14 | 2007-08-09 | Voith Patent Gmbh | Verfahren zum Entgasen von Faserstoffsuspensionen unter Verwendung eines Drucksortierers |
DE102006033773A1 (de) * | 2006-07-21 | 2008-01-24 | Voith Patent Gmbh | Verfahren zur geregelten Förderung einer Faserstoffsuspension, insbesondere zu einem Stoffauflauf einer Papier- oder Kartonmaschine |
DE102006035956B3 (de) * | 2006-08-02 | 2007-08-23 | Voith Patent Gmbh | Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf |
DE102006036018B3 (de) * | 2006-08-02 | 2008-01-31 | Voith Patent Gmbh | Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf einer Papiermaschine |
DE102007038089A1 (de) * | 2007-08-11 | 2009-02-12 | Voith Patent Gmbh | Konstantteil |
-
2009
- 2009-05-12 DE DE102009020949A patent/DE102009020949A1/de not_active Withdrawn
- 2009-05-12 DE DE202009018662U patent/DE202009018662U1/de not_active Expired - Lifetime
-
2010
- 2010-03-22 US US13/319,929 patent/US20120048495A1/en not_active Abandoned
- 2010-03-22 WO PCT/EP2010/053686 patent/WO2010130493A1/de active Application Filing
- 2010-03-22 EP EP10709733A patent/EP2430234A1/de not_active Withdrawn
- 2010-03-22 BR BRPI1007639-5A patent/BRPI1007639A2/pt not_active Application Discontinuation
- 2010-03-22 CN CN2010800210207A patent/CN102421962A/zh active Pending
- 2010-03-22 CA CA2761661A patent/CA2761661A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10050109A1 (de) | 2000-10-09 | 2002-04-11 | Voith Paper Patent Gmbh | Verfahren und Mischvorrichtung zur Erzeugung einer fertigen Faserstoffsuspension |
DE102004051327A1 (de) | 2004-10-21 | 2006-05-04 | Voith Paper Patent Gmbh | Verfahren zur Entgasung und Zuführung einer Faserstoffsuspension zu einem Stoffauflauf sowie Entgasungsvorrichtung |
WO2008119872A1 (en) * | 2007-04-03 | 2008-10-09 | Andritz Oy | An apparatus for removing gas in connection with a paper machine or corresponding |
Also Published As
Publication number | Publication date |
---|---|
BRPI1007639A2 (pt) | 2018-02-20 |
CN102421962A (zh) | 2012-04-18 |
EP2430234A1 (de) | 2012-03-21 |
US20120048495A1 (en) | 2012-03-01 |
CA2761661A1 (en) | 2010-11-18 |
DE202009018662U1 (de) | 2012-07-16 |
DE102009020949A1 (de) | 2010-11-18 |
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