• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    12 ABSTRACT The invention relates to a liquid distributor (10) in an apparatus (100) for Washing ofcellulose pulp, Where pulp is arranged to be transported in a Vat (5) coniprising a Vat Wall(5) and a Vat Chamber (8), said liquid distributor (10) coniprising an inlet (12) arranged toreceive liquid in a first direction (V1), a first floW redirecting Wall (14) arranged to redirect theliquid in a second direction (V2), an outlet (13) arranged to output the liquid into the Vatchamber (8), and a channel (11) With a first channel section (1 la), Which first channel section(1 la) has a first channel cross section area (A1, A1 1+A12+A13) and is placed between the inlet(12) and the first floW directing Wall (14), and With a second channel section (1 lb), Which secondchannel section (11b) has a second channel cross section area (A2, A2°, A21+A22) and isplaced between the first floW directing Wall (14) and the outlet (13). According to the inventionthe second channel cross section area (A2, A2”, A21+A22) is eVeryWhere larger than thefirst channel cross section area (A1, A11+A12+A13). Fig. 5
    公开号:SE1251084A1
    申请号:SE1251084
    申请日:2012-09-25
    公开日:2014-03-26
    发明作者:Hans Lövgren；Patrik Pettersson；Tobias Lööf
    申请人:Valmet Oy；
    IPC主号:
    专利说明:

    lO LIQUID DISTRIBUTOR FOR A WASHING APPARATUS,AND WASHING APPARATUS TECHNICAL FIELD The invention relates to a liquid distributor for a washing apparatus according to the preamble of claim l and to a washing apparatus according to the preamble of claim 9.BACKGROUND Pulp washing is a key operation in the pulping line. There are many different types ofwashing apparatuses available, some of which are based on press washing and comprisemeans for pressing the pulp to remove liquid. After pressing, the pulp can, if suitable, be diluted to a desired consistency.
    A well-known washing machine is a twi11-roll press of the general type disclosed inUS 3,980,5 18, for example. It has two counter-rotating rolls with perforated outer surfaces.A web of pulp is formed on the respective rolls and is transported in the direction ofrotation in a vat partially surrounding the rolls, to the so-called press nip between the rolls.The liquid removed from the pulp, i.e. the filtrate, passes through the perforated roll surface in aradial inwards direction and is, by means of axial filtrate channels, led to the ends of the pressroll, where it is output. Washing liquid or other treatment liquid may be supplied to the pulp webthrough inlets in the vat.
    Another known washing equipment is a drum washer, as in e.g. US 5,046,338 orSE 502815, where the cellulose-containing pulp is deposited and dewatered on a singlerotating filter drum with a perrneable outer surface, after the addition of washing liquid,which displaces the liquid remaining on the pulp web after the preceding process step, forexample a cooking step or bleaching step. The static pressure causes the contaminatedliquid, called filtrate, to pass through the outer surface perrneable to liquid. A furtherdevelopment of the original drum washer is the pressurized displacement washer, where thefiltrate, under overpressure, is forced to pass through the perrneable outer surface. In these examples washing liquid is fed through a nozzle and is then output through a slot in a baffle. lO A problem with directing the washing liquid perpendicular to the pulp web is that it passesright through the pulp web with high Velocity and with the smallest possible contact routewith the fibres. This gives longitudinal tracks in the fibre web and the washing is ineffective, since the washing liquid is mixed with the filtrate.
    In SE 448524 a liquid distributor is shown with an output perpendicular to the input andwhere the output channel is enlarging towards the output. The purpose is to slow down thewashing liquid, by having a conical nozzle. Since the cross section area is continuouslyincreasing towards the outlet, the washing liquid will slow down. A problem is that a coneneeds to be long in order to have effect and thus takes a lot of place and will thus not be efficient enough for this purpose.
    The inlet to the conical nozzle is tangential to the cone which redirects the flow. The crosssection area right after the flow redirection is the same as before the flow redirection andthe flow redirection will therefore not in itself cause any decrease in velocity. Instead, the purpose to cause whirls.
    SUMMARY An object of the invention is to provide an improved liquid distributor for an apparatus forwashing and/or dewatering of cellulose pulp. This object is achieved in accordance with the appended claims.
    The inventions builds on the insight that a tangential inlet to a nozzle or other liquiddistributor where the incoming washing liquid is redirected by a flow redirecting wall, doesnot slow down the washing liquid, unless also the cross section area in the channel after theflow redirecting wall is everywhere larger than before the flow redirecting wall. Otherwise the only effect is to case whirls, which will have a limited effect to improve the washing.
    An advantage is that the washing liquid can be provided with a high pressure, which makesthe distribution to a number of nozzles or other liquid distributors easier, without having tohave a separate valve to each nozzle. At the same time the velocity of the washing liquidwill not be too high when it meets the pulp. This causes the washing liquid to make a layer on the outside of the pulp, instead of going right through the pulp at isolated points. This lO also minirnises mixing of the filtrate pressed from the pulp, Which is not desired. TheWashing liquid is both calmed down and spread, Which makes the Washing of the pulp more effective. Since the solution is compact it does not take much place.
    BRIEF DESCRIPTION OF THE DRAWINGS The inVention, together With further objects and advantages thereof, may best be understood by reference to the following description and appended draWings, in Which: Fig. 1 is a schematic cross-sectional View illustrating a Washing/deWatering apparatus With aliquid distributor according to the inVention.
    Fig. 2 is a schematic cross-sectional View of a first embodiment of a liquid distributoraccording to the inVention.
    Fig. 3 is a schematic cross-sectional View of a second embodiment of a liquid distributoraccording to the inVention.
    Fig. 4 is a schematic cross-sectional View of a third embodiment of a liquid distributoraccording to the inVention.
    Fig. 5 is a schematic cross-sectional View of a fourth embodiment of a liquid distributoraccording to the inVention.
    Fig. 6 is a schematic cross-sectional View of a fifth embodiment of a liquid distributoraccording to the inVention.
    Fig. 7a, b, c is a schematic cross-sectional View of a sixth embodiment of a liquiddistributor according to the inVention With Variants.
    Fig. 8 is a schematic cross-sectional View of a seventh embodiment of a liquid distributoraccording to the inVention.
    Fig. 9 is a schematic cross-sectional View of a eighth embodiment of a liquid distributor according to the inVention. lO DETAILED DESCRIPTION In the drawings, similar or corresponding elements are denoted by the same reference numbers.
    Fig. 1 illustrates an example apparatus 100 for washing of cellulose pulp. A twin roll press100 comprising two co-operating cylindrical press rolls/drums 2 is shown. The press rolls 2are arranged to rotate in opposite directions R, R” during operation and each has a perrneableouter surface 4, such as a perforated metal sheet. The press rolls 2 are partially enclosed by a vat5 comprising a vat wall 5 and a vat chamber 8, which vat 5 is arranged at a distance from theperrneable outer surfaces 4 so as to partially enclose the press rolls 2 in the circumferential direction.
    During operation, pulp enters a pulp distribution device 1 of the respective press roll 2. The inputconsistency of the pulp is typically in the range of 2-13%. A pulp web is formed on theperrneable roll surface 4. The pulp web is transported, guided by the vat 5, in the directionof rotation R, R” to be pressed in a nip 3 where the distance between the press rolls 2 issmallest. The press rolls 2 comprise axial filtrate channels 6, which receive filtrate from the pulpweb. The filtrate passes through the perrneable roll surface 4 and is transported towards theends of the press rolls 2, where it is output. Washing liquid is supplied to the pulp web in thevat chamber 8 through liquid distributors 10. The pulp is output by means of a discharge screw7.
    In Fig. 2 and Fig. 3 a liquid distributor 10 in the form of a nozzle is shown for the supply ofwashing liquid, according to a first ernbodirnent of the invention. The liquid distributor 10comprises an inlet 12, an outlet 13, a first flow redirecting wall 14 that redirects the liquid, and achannel 11 with a first channel section 1 la and a second channel section 1 lb. In this example, the second channel section 1 lb is also the last channel section.
    The first channel section 11a is has a first channel cross section area A1 and is placed betweenthe inlet 12 and the first flow directing wall 14. The second channel section 11b has a secondchannel cross section A2, which is larger than the first channel cross section area A1, and is placed between the first flow directing wall 14 and the outlet 13.
    The inlet 12 receiVes the liquid in a first direction V1 at a first Velocity V1 with a first pressure P1in the first channel section 11a. The first flow redirecting wall 14 redirects the liquid in a seconddirection V2 at a second Velocity V2 with a second pressure P2 in the second channel section 11c.Since the second channel cross section area A2 after the first flow redirecting wall 14 is largerthan the first channel cross section area A1 before the first flow redirecting wall 14, the secondVelocity V2 will be lower than the first Velocity V1, but the second pressure P2 will be about the same as the first pressure P1.
    The second channel cross section area A2, A2” in the first channel section 11a is eVerywherelarger than the first channel cross section area A1 in the second channel section 11b. In Fig. 2 thesecond channel cross section area A2 is constant from the first flow redirecting wall 14 to theoutlet 13, while in Fig. 3 the second channel cross section area A2, A2” is continuouslyincreasing from the first flow redirecting wall 14 to the outlet 13. The second channel crosssection area A2, A2” may also be partly constant and partly increasing from the first flowredirecting wall 14 to the outlet 13. The second channel cross section area A2, A2” is, however,preferably not decreasing from the first flow redirecting wall 14 to the outlet 13, since that would again increase the Velocity.
    This combination of haVing a flow redirecting wall and an area increase makes it possible to haVea high pressure on the washing liquid from the start, so that it spreads well to all the liquiddistributors. The liquid distributors will then both spread the washjng liquid and calm it down.This means that the washjng liquid will be applied on one side of the pulp web and does not mix urmecessarily with the filtrate, which giVes a more efficient washing.
    In Figs. 2 and 3 the liquid distributor 10 has an outlet 13, which is perpendicular to the Vat wall5. This is preferable, because the washjng liquid will be distributed better in that way. In Fig. 4the liquid distributor has a solution as in Fig. 2, but instead has an outlet which is essentiallyparallel to the Vat wall 5, which also is possible. Also the following embodirnents in Fig. 5-7 may be arranged with an outlet essentially parallel to the wall or at any angle there between.
    In Figs. 5 and 6 is shown a liquid distributor 10 according to a further ernbodirnent of theinVention. The liquid distributor 10 comprises an inlet 12, an outlet 13, a first flow redirecting wall 14 that redirects the liquid, a second flow redirecting wall 15 that redirects the liquid, and a channel 11 With a first channel section 11a, a second channel section 11b and a third channelsection llc. In this example, the second channel section 11b is also the penultimate channel section 1 lb and the third channel section 11c is also the last channel section 11c.
    The first channel section 11a is has a first channel cross section area A1 and is placed betweenthe inlet 12 and the first flow directing wall 14. The second channel section llb has a secondchannel cross section A21+A22, which is larger than the first channel cross section area A1, andis placed between the first flow directing wall 14 and the second flow directing wall 15. The thirdchannel section 11c has a third channel cross section A3, which is larger than the second channelcross section area A21+A22, and is placed between the second flow directing wall 15 and the outlet 13. .
    In this embodiment the second and penultimate channel section llb is divided into two parallelpenultimate subchannels after the first flow redirecting wall 14, which penultimate subchannelshave the second channel cross section areas A21 and A22. Thus, the penultimate channel section 11 has a total second channel cross section area A21+A22.
    Of course, also other areas than the second channel cross section area may be divided into anumber of areas in a similar way. In each case it is the total flow area that counts. There are,however, special advantages with having subchannels in the penultimate channel section llb,since this improves the spreading of the liquid onto the pulp web. It is even better to have morethan two penultimate subchannels in the penultimate channel section llb, e. g. four subchannels,because the more subchannels the less it matters how the subchannels are directed, when thenozzle 20 is mounted. It is, however, of course also possible in this embodiment to have a second channel section 1 lb, which is not divided into subchannels.
    In the embodiment in Fig. 5, the liquid distributor 10 comprises a nozzle 20 which comprises thefirst channel section 11a, the second channel section llb, the inlet 12 and the first flowredirecting wall 14. The third channel section 11c and the second flow redirecting wall 15 areprovided in the vat wall 5. This solution makes it possible to exchange prior art nozzles havingonly a straight ir1let with the new improved nozzle 20. An altemative is that the complete liquiddistributor 10 is a nozzle 20. Any combination of what is made in the vat wall 5 and/or a nozzle 20 is possible. This applies to all embodiments. However, the first flow redirecting wall 14 will Wear more than any subsequent floW redirecting Walls, since the liquid meets the first floWredirecting Wall 14 With higher Velocity than any subsequent floW redirecting Walls. Therefore a cheap solution is to have the first redirecting Wall 14 in a Wear part that is easily replaceable.
    The inlet l2 receiVes the liquid in a first direction Vl at a first Velocity Vl With a first pressure Pl.The first floW redirecting Wall 14 redirects the liquid in a second direction V2 at a second VelocityV2 With a second pressure P2. The second floW redirecting Wall 15 redirects the liquid in a thirddirection V3 at a third Velocity V3 With a third pressure P3. As in the description aboVe, thesecond Velocity V2 Will be loWer than the first Velocity Vl, and the third Velocity V3 Will be loWerthan the second Velocity V2. Further, the third pressure P3 Will be about the same as the second pressure P2 and the first pressure Pl.
    In Fig. 5 the third cross section area A3, A3” comprises tWo parts With different constant areasA3, A3” from the second floW redirecting Wall 15 to the outlet l3, since the nozzle 20 does notgo all the Way to the surface of the Vat Wall 5. But the third cross section area A3, A3” may ofcourse also be constant all the Way or be continuously increasing (e. g. in tWo parts as in Fig. 6)from the second floW redirecting Wall l5 to the outlet l3 or be partly constant and partlyincreasing from the second floW redirecting Wall l5 to the outlet l3. The third cross section areaA3, A3” is, hoWeVer, preferably not decreasing from the second floW redirecting Wall l5 to the outlet l3, since that Would again increase the Velocity and the pressure.
    Preferably, the third cross section area A3 is at least tWice the second cross section area A2,A2l+A22. Preferably, also the second cross section area A2, A2l+A22 is at least tWice the first cross section area Al.
    In Fig. 7a-c is shoWn a liquid distributor l0 With an eVen more irnproVed Way of spreading outthe Washing liquid on the pulp Web. The same nozzle 20 as in Figs. 5 and 6 is used, but as anexample having four penultimate subchannels in the second and penultimate channel section llbin each nozzle 20. The number of penultimate subchannels may of course be any number also in this embodiment.
    The liquid distributor l0 is here arranged to comprise a number of nozzles 20. For sirnplicity, Fig. 7b and c only shoWs three nozzles 20, but preferably there are nozzles 20 all the Way along the press rolls 2 in Fig. 1 in a direction perpendicular to the view in Fig. 1. This may be seen asone large liquid distributor 10, where both the first channel section lla and the penultimatechannel section llb are divided into subchannels. The total cross section area of the first channel section l la then becomes Al l+Al 2+Al3.
    This means that the third and last channel section llc becomes very large, which both slowsdown the washing liquid considerably and spreads the washing liquid in a large area. This may be finther improved with an increasing third channel cross section area as in Fig. 6.
    There may, however, still be flow concentrations of liquid in the case where the penultimatechannel sections llb from different nozzles face each other like in Fig. 7b. When the flows fromtwo different nozzles 20 meet, there will be a concentrated flow upwards towards the pulp web.This is more pronounced the fewer the penultimate subchannels are in each nozzle 20. A similarflow concentration will occur where the distance from the outlet of the penultimate channelsection llb is close to the second flow redirecting wall 15. Said flow concentrations are,however, not the fraction as hard as what is known in prior art and most of the liquid will still beput in a layer of the pulp web, without going right through the pulp web in concentrated beams as in prior art.
    But the spreading out of the liquid onto the pulp web may be even fiirther improved by mountingthe nozzles 20 so that the penultimate channel sections llb from different nozzles 20 does not face each other, see Fig. 7c.
    In Fig. 7c is also shown that the last channel section llc may have enlarged end parts 21 in orderto increase the distance from the outlet of the penultirnate channel section 1 lb to the second flow redirecting wall 15.
    In Fig. 8 is shown an ernbodirnent with a single nozzle 20 having a penultimate channel section 1 lb with two penultirnate subchannels pointing towards two enlarged end parts 21.
    A further advantage, particularly with the ernbodirnent in Fig. 7a-c, is that larger and/or fewer nozzles may be used than in prior art, which makes a cheaper solution.
    In. Fig. 2-7 the liquid distributor 10 is arranged in the Vat Wall 5, Without extending into the VatChamber 8. This is preferable in order to decrease the mixing of the Washjng liquid With thefiltrate and to decrease the disturbance of the pulp Web transportation. It Would, however, bepossible also to use, for example, only the nozzle 20 itselfin Fig. 4-7 Without the second flowredirecting Wall 15 or the third channel section llc, see Fig. 9. In this case the liquid distributorhas the second channel section llb as the last channel section and thus a horizontal outlet. Thenozzle 20 should then be mounted so that it extends as little as possible from the Vat Wall 5 so that it disturbs the pulp as little as possible.
    The embodirnents disclose one or two flow redirecting Walls and redirections With accompanyingarea increases, but three or more flow redirecting Walls and redirections With accompanying areaincreases are also possible and are especially Very good in case of large Velocity decreases, Whichotherwise Would be Very space consuming. If there for example are four channel sections, thenthe fourth channel section Will be the last channel section and the third channel section Will be thepenultimate channel section. This applies also in a corresponding Way When there are even more channel sections.
    The invention is of course not restricted to the shown embodirnents, but may be Varied Within the scope of the clairns.
    权利要求:
    Claims (13)
    [1] 1. A liquid distributor (10) in an apparatus (100) for washing of cellulose pulp, where pulpis arranged to be transported in a Vat (5) comprising a Vat wall (5) and a Vat Chamber (8),said liquid distributor (10) comprising an inlet (12) arranged to receive liquid in a firstdirection (V1), a first flow redirecting wall (14) arranged to redirect the liquid in a seconddirection (V2), an outlet (13) arranged to output the liquid into the Vat chamber (8), and achannel (11) With a first channel section (lla), which first channel section (lla) has a firstchannel cross section area (A1, A11+A12+A13) and is placed between the inlet (12) and thefirst flow directing wall (14), and With a second channel section (1 lb), which second channelsection (llb) has a second channel cross section area (A2, A2”, A21+A22) and is placedbetween the first flow directing wall (14) and the outlet (13), characterized in that the secondchannel cross section area (A2, A2°, A21+A22) is everywhere larger than the first channelcross section area (A1, A11+A12+A13).
    [2] 2. A liquid distributor (10) according to clairn 1, characterized in that the second channelcross section area (A2, A2”, A21+A22) is constant and/or increasing, but not decreasing from the first flow redirecting wall (14) to the outlet (13).
    [3] 3. A liquid distributor (10) according to any of the claims 1-2, characterized in that theliquid distributor (10) further comprises a second flow redirecting wall (15) after the firstflow redirecting wall (14); in that the channel (11) comprises a third channel section (1 1c)with a third channel cross section area (A3, A3°) being placed between the second flowredirecting wall (14) and the outlet (13); in that the second flow redirecting wall (15) isarranged to redirect the liquid in a third direction (V3); and in that the third channel crosssection area (A3, A3°) is everywhere larger than the second channel cross section area (A2, A2 ° , A21+A22).
    [4] 4. A liquid distributor (10) according to clairn 3, characterized in that the third crosssection area (A3, A3°) is constant and/or increasing, but not decreasing, from the second flow redirecting wall (14) to the outlet (13). 11
    [5] 5. A liquid distributor (10) according to any of the claims 1-4, characterized in that the liquid distributor (10) is arranged in the Vat Wall (5), Without extending into the Vat chamber (8)-
    [6] 6. A liquid distributor (10) according to any of the claims 1-5, characterized in that theliquid distributor (10) has an outlet (13) that is essentially perpendicular to the Vat Wall (5).
    [7] 7. A liquid distributor according to any of the claims 1-6, characterized in that the liquid distributor (10) has an outlet (13) that is essentially parallel to the Vat Wall (5).
    [8] 8. A liquid distributor according to any of the claims 1-7, characterized in that a section (1 la, 1 lb, 1 1c) of the channel (1 1) is divided into parallel subchannels.
    [9] 9. A liquid distributor according to clairn 8, characterized in that a penultimate channelsection (1 lb) is divided into parallel penultimate subchannels, Which different penultirnate channel sections are not facing each other.
    [10] 10. A liquid distributor according to any of the claims 1-9, characterized in that the inlet(12), the first floW redirecting Wall (14), the first channel section (11a) and the second channel section (1 lb) are arranged in a nozzle (20).
    [11] 11. A liquid distributor according to clairn 10, characterized in that the liquid distributor (10) comprises at least one nozzle (20) and a common last channel section (1 1c).
    [12] 12. A liquid distributor according to clairn 11, characterized in that the common last channel section (1 1c) comprises at least one enlarged end part (21).
    [13] 13. Apparatus (100) for Washing of cellulose pulp, Where pulp is arranged to be transportedin a Vat (5) comprising a Vat Wall (5) and a Vat chamber (8), Where at least one liquiddistributor (10) for Washing liquid is connected to the Vat (5), characterized in that the at least one liquid distributor (10) is according to any of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CA2872229C|2020-03-31|
    BR112014032283A2|2017-06-27|
    EP2900865A1|2015-08-05|
    EP2900865B1|2017-09-27|
    CA2872229A1|2014-04-03|
    SE537341C2|2015-04-07|
    CN104704166A|2015-06-10|
    EP2900865A4|2016-06-15|
    CN104704166B|2016-07-27|
    WO2014051493A1|2014-04-03|
    BR112014032283B1|2021-05-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    SE530586C2|2006-11-30|2008-07-08|Metso Paper Inc|Method and unit for sealing adjustment in a washing device and washing device comprising sealing adjustment unit|
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    SE0802072A2|2008-10-01|2010-07-20|Metso Paper Inc|Washing press for washing cellulose pulp|CN110403554A|2018-04-27|2019-11-05|三花亚威科电器设备（芜湖）有限公司|Distributor and dish-washing machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1251084A|SE537341C2|2012-09-25|2012-09-25|Liquid distributor for a washing machine and a washing machine|SE1251084A| SE537341C2|2012-09-25|2012-09-25|Liquid distributor for a washing machine and a washing machine|
    EP13840460.3A| EP2900865B1|2012-09-25|2013-07-04|Liquid distributor for a washing apparatus|
    CN201380047025.0A| CN104704166B|2012-09-25|2013-07-04|Liquid distributor and washing facility for washing facility|
    PCT/SE2013/050870| WO2014051493A1|2012-09-25|2013-07-04|Liquid distributor for a washing apparatus, and washing apparatus|
    BR112014032283-0A| BR112014032283B1|2012-09-25|2013-07-04|liquid distributor in a cellulose pulp washing apparatus|
    CA2872229A| CA2872229C|2012-09-25|2013-07-04|Liquid distributor for a washing apparatus, and washing apparatus|
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