• 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:
    8/8 ABSTRACT The invention relates to an improved agitator system for a vat in a disc fit-ter used to fiiter out fine particle material in a raw suspension. The iriventive agitator system cornpršses a first nozzle (31) arranged between tvi/o coiiectiott chutes and betweentwo walls ofthese chutes that are Oriented paraliei vvlth the filter stirface of the fiiter disc (12) and a secondnozzie (32) is arranged at one of the Walls of the coiiection chute Oriented orthogonaiiy with the fiiter surface of thefiiter disc, and 'vvnerein both the first and second nozzies (31 and 32 respectiveiy are orientecl such that theoutfiovv from the nozzles (41 and 42 respectiveiy) coincides and are parallei to the sernicircuiar form ofthe vat bottom (ma). (Figßi) KST15001SE_text prio.docx
    公开号:SE1550999A1
    申请号:SE1550999
    申请日:2015-07-09
    公开日:2017-01-10
    发明作者:Björnvall Patrik；Söderman Jerk；RANSJÖ Henrik
    申请人:Valmet Oy；
    IPC主号:
    专利说明:

    1/8 AGITATOR SYSTEM FOR A DISC FILTER Background of the lnvention The lnvention relates to disc filters where agitation systems are tised the vet preventing settllng of line particlematerial in the bottom of the vat. This problem is especially seen in disc filters used in the recovery island of apulp mill, vrhere lime mud particies are suspended a weak or strong liquor. The lime mud particles soon settiesin areas ofthe disc filter where the flovv of the suspension is stagnant, and form dense and incompressible layers of lime cake deposits.
    Prior ArtSeveral solutions has been presented for avoidance of settlihg of suspended lirne rnud particles in disc filters.
    Among these agitator systems are so called “mammuth” pumps, eductors or mechanicai stirring elements.
    An example using “mammoth” pumps is shown in Celleco Hedemora ABs (now Valmet AB) patent tftfüâä/Qßi-flß, vvhere one single “rnammoth“ pump is arranged the lovvermost position of the vat. The “marnrnoth" pump ischaracterizíed by inlecting air into an eductor like nozzle that subject surrounding lovver ofthe vat 'with asuction force, thus vvitlidravvlrig some ofthe suspension into the eductor like liozzle. The eductor like nozzle isdirecting the flow upvvardly. l-lovvever, one disadvantage that the inlet flovv vvltli ravv suspension to be filtered isarranged orthogonally to the flow from the mamrrioth and the rotation of the discs are directed opposite tothe infiovv of raw suspension. Another is that the single “mammoth“ pump may not prevent settling at outer endsof the vat, and the very strong upwardiy directed flow from the “marnrnoth" pump may interfere vvith precoat on adjaceiwt filter discs.
    Ariother example improvement shown lri Baker l--itiglies lnc's “i/“i/O98/l6292. lri essehce, the improvementhere is limited to ari exchange of the air as driving medium tor an eductor to iristead using the ihllovi/ of rawsuspension to be filtered as driving medium for the eductor. However, this design has been used in many disc filters on the market, also those sold by Valrnet AB.
    Yet another system has been used disc filters, also those delivered hy Valmet AB, as the above anti settlingsystems still did not prevent settllng in entire vat. ln this systern vvas a reciprocating cradle rake installed in thebottom ol' the vat, svveepirig over the entire bottom. l-lovvever, the lime mud could in some filters form dense packad and practically incompressihle deposits that subiected the mechanisrri for very high rnechariical load that in some cases led to that the cradle rake broke down.
    Further. some disc filters have alternative mechanical stirrers been used, and one such variant is to attachsmall paddle members on the outer periphery ofthe filter discs, such that these paddle members bring about astirring action close to the bottom 'vvall of the var. during rotation ofthe discs. However, this resulted ih more loadoh the that may deflect the position of the discs to such an extent that the discs may iritersect vvith the doctor blade vvhich then soon up the cloths on the discs. l-lence, even if several solutions has been proposed and used in real environment, no anti settling system has heen available that totally prevents settling and minimizes mechanical action on the fine particles in the KST15001SE_text prio.docx 2/8 stispertsion. in disc filters where the suspended in ttie suspension are iirne particies, it is essential toiirhit mechanicai action on the particles as excessive purnpihg and agitation in pumps rnay reduce particle size and as e resuit ofthat radiceiiy reduce the fiiterabiiity ofthe suspension es the fiiter may be biocited.
    Summary of the lnvention:'the generai objective of the ihvention is to improve agitatioh ih vat of a disc filter such that settiing ofparticies suspended in the suspension rnore efficientiy preverited, and using e rninirnurn of rnecheriicai irnpect on the fine particles and thus maintaihs a high fiiterabiiity.
    Hence, the invention is reiated to en agitator system for a vat in e disc fiiter used to filter out fine particie materialin a raw' suspension. The disc fiiter comprises a rotating shaft with a rnuititude of filter disc rotating in a vat vvith atieast e serniciicuiar bottom wail ioceted iri bottom part ofthe disc fiiter. Further, a doctor biade is erranged pareiielvi/ith the fiiter surface ofttie iiiter disc, vvittt a coiiectiori chute located under the doctor blade. "the coiiectiori chuteforrriing a substantiaiiy verticai box iike coliection chute with an upper opening under the doctor biade and a ioweroutiet in the iower part of the sernicirctriar bottom pert of the vet. Said box iiite coiiection chute having two vraiisoriented paraliei with the fiiter surface of the fiiter disc and tvvo vvails oriented orthogonaiiy with fiiter surface ofthe filter disc. 'the inventive agitator systern for this kind of disc fiiter is characterized in that a first nozzie (31) arreriged between two coliection chutes and between two weiis of' these chutes that are oriented paiaiiel vvitii thefiiter surface of the fiiter disc. Further, a second nozzie (32) is arranged at one ofthe waiis ofthe coliection chuteoriented orthogonaiiy tvith the fiiter surface of the fiiter disc, and whereih both the first and second nozzies (31 and32 respectivehf) are oriented such that the outfiow from the nozzies coincides end ere pareilei to the sernicircuiar forrri the vat.
    By this arrangerrierwt with a first and second rtozzle (31 and 3.2 respectively), one arranged between chutes, andone at a waii of the chute, couid the entire bottom waii of the vat be subjected to an intehsified circulation thatprevents settiihg in bottom part of the vat. And by having the very same fiow direction from the hozzles couidoutiet fiow froih both nozziies assist each other in estabiishment of a strong agitating fiow not reducing effect frontthe other nozïzie as is the case may be rior art systems where hozzles and/or inlets are arranged orthogohaiiy to each other. in one erhbodiment of the invention is the first nozzie (31) errahged in e circumferentiai position in thesenticircuiar bottom at an angular position (d) at ieast 5 degrees ahead ofthe second nozzie (32), and at 90 degrees ahead of the second nozzie (32). By this design wiii iater positioned nozzie assist in creating an intense fiow as the outiet fiow adds on to the first fiow established by the rtozzle positioned eariier. ih another ernbodirhent of the invention is the first nozzie (31) arrenged in a vertical plene crossing the shaft (1 i)that aiso intersects with a disc, thus injecting fiow towards the outer periphery ofthe disc. disc niay theh heipto contain a flow between the periphery ofthe disc and the bottom vifaii (iOa) of the vat, in a narrovv gapestabiished there betvveen. As ttie conventionaiiy do riot have eriy active fiitering surface at the rediallydirected surface ofthe disc, couid aiso no interference with precoat formation or fiitration process occur by the flow in the gap. in e preferred ernbodirrient ofthe invention is e recircuietiori systern connected to one of the first and secondrrozzies (31 and 32 respectiveiy), cornpiising an iniet in the vet for extracting a part ofthe suspension kept in thevat, a piping systern connecting the iniet vvith the hozzie in concern, and a pump in said pipirwg system. The suppiyof suspension to that nozzie connected to the recircuiation system mey then be controiied ihdependently of the other.
    KST15001SE_text prio.docx 3/8 ln yet a preferred ernbodirnent of the inventiori is the recircuiatiori systern connected to the second nozzie (32). Asthe second nozzie (32) is located at a position where a shorter part of the semicircular pottom of the vat issuhjected to the flow from that nozzie could a srnaiiei' volume flow be used for obtaining the necessary agitation,and less pumping impact on fine particies rnay be obtained. Vlíhen the filter is Operating at full capacity is the needfor recirculatioii rate lower compared operatin; the filter at only partial load. 'therefore could this independentrecircuiation be controlled such that the recircuiated volurne per hour rriay high at partiai capacity, while onlysome 19-2093 ofthis volume per hour at full capacity, as the ordinary flow from other nozzle is much stronger at full capacity operations of the filter (i.e infeed of liquor to he filtered is higher). ln a preferred elnbodiinent of the invention is the second nozzle (322) an ediictor nozzile located adjacent the wallof the collection chute oriented orthogonally with the filter suriace of the filter disc. Locating an eductor' at thisposition, close to the vvall, improves anti settling effect close to the wall of the collection chute, as this position may otherwise form a stagnant zone. in a fiirther preferred ernhodiment of invention is a feed systern forfeeding a raw suspension with particlernaterial is connected to one of the first and second nozzles (31 and 32 respectiveiy). By conducting the irilet flow of raw suspension to this nozzle could the necessary iniet flow be used as a contributing agitation flow. ln yet a preferred emhodirnent of the invention is the feed system connected to the first nozzle (31). As the firstnozzle (iii) is located at a position where a larger part ofthe seinicircuiar bottom ofthe vat subjected to the flovv' from the first nozzie (31), could this high volume flow' be used to establish a strong basic flow over the vat bottom.
    As an additional assisting anti settling effect is the invention also preferably designed such that the rotating shaftof the disc filter is connected to a drive unit that rotates shaft and tlie associated filter discs such thatrotational direction of the dlscs coincides with the outflovv direction of the and second nozzle (32). Therotationai effect frorn the discs hririgs about an assisting effect to the outiet fiow frorri the first and second riozzies (31 and 3.2 respectively), similar to the effects of disc-pack pumps, i.e. pumps sold under the name of DiscFioTM.
    List of Drawings ln the following scheniatic dravvings are details iiumbered alil<;e figures, and details identified and numbered inone figure may not be iiurnbered in other figures in order to sirnpiify figures.
    Figure 1; is a cross-sectionai side vievv of a conventional disc filter;Figure 2; is a cross-sectionai end view of the disc filter as seen section A-A in figure i, with conventional components identified; Figure 3 is a cross--sectional top vievv' ofthe disc filter 'with the inventive agitation system disclosed;Figure 4 is a cross--sectionai end vievr ofthe disc filter vvith the inventive agitation systern disclosed;Figure 5 is a cross-sectionai top view the disc iiiter vvitli the inventive agitatiori systern disclosed, put vyith shaft and filter discs removed;Figure 6 is a cross-sectional end vieyv ofthe disc filter with the inventive agitation system disclosed, and associated piping system; Figure 7 is a flow' simulation from the inventive agitation systent;Figure 8 is a flow' simulation from using a prior alt agitation system; andFigure e is a flow simulation frorn using the second nozzle (32).
    KST15001SE_text prio.docx 4/8 Detailed Description of the lnventionCONVENTiONAL DiSC FELTER FEATURES in figures 1 and are disciosed basic weii Known details ofa disc 'the disc iiiter 1 is used to fiiter out fine particie rnateriai in a raw suspension and cornprises a rotating hoiiovv shaft11 vvith a multittrde of fiiter disc 12 rotatihg a vet 1G vvith at least a semicircuiar bottom wait 'iOa iocated in bottom part of the disc fiiter. The iiiter discs drairts the fiitrate to the hoiiow shaft via outiets 13.
    A doctor hiade 3G is arranged paraiiei with the fiiter surface of the iiiter disc 12, and e collection chute iocatedunder the doctor biade erid torrnihg e substantially vertical box iiite coilection chute vvitti an upper opening 26under the doctor biade and a tower outiet 27 in the iovver part of the semicircuier bottom part 10a of the vet. Saidbox iike cotiectiort chute having two 'walls 2í~äef29b oriented perattei with the fiiter surface ofthe fiiter disc 12 and tvvo 'walls 28a/28b oriented orthogonaiiy vvith the fiiter surface of the iiiter disc 12. 'the disc fiiter1 includes at ieast one disc the disct2 to those described in the prior art ih that soiidrrieteriai is removed from ravv slurry by forcirtg the iiquid through fiitering discs 12, white the soiid fine particiemateriel eccumuiates on the fiiter. the ttquid is forced through the discs 12 by creating e pressure ditferentiaibetween the of iiiter housing 10 and the oiitiet. 'the discs 12 may a perforated ntaterial such asntetai and covered vvith a fine rnesh ciotiw such as a poiypropyiene cioth or any other suitable ciotiw materiai. 'tiie rnateriei is referred to generaiiy as the iiiter cioth. išacr disc 12 is divided into disc sectors (not shown) vvtiictiare individually covered vvith the fiiter cioth. 'the discs 12 ere positioned vvithin the housing 1G that holds the ravvsoiid/'iiqtiid slurry in bottom part at a certain iiquid ievei Lier. The levei of the raw siurry cen vary put tyfpicaiiy isapproximeteiy ciose to or below the center of the disc 12. As the discs 12 rotate, each sector fuiiy enters the siurryand an amoiint of soiid materiai is deposited on the surface of eacii disc sector. 'the solid rnaterial is thenremoved from eacii sector separate tite soiid from iiquid. Viiiien fitterihg green or white iiduor sitrrries in therecovery isierd of a puip rnill is the iiiter ciotr as such not sufticieht to reach a low particie coritent in the tlltrate.'the cioth is rnore used to be abie to forrn a precoat iayer of fine barticies on the cioth, and after estahiishment ofthe precoat couid effective fiitration begin obteining a filtrete with iow particie content. When time mud particiesbuiid up on this precoat, e scraper mechanism is used to remove the pertictes. scraper rnechahisrn includes a doctor 'piade 30 that removes tiie cake lafver front the precoat iayer. [Duringfiitration, the disc 12 rotates (as shovvrt on Fig. 4, "RO'T”). '-s each disc sector passes through the siurry anderrierges frorn the siurry, edditionai soiid rriateriai is deposited on the surface the sector. As tre sectors pass the doctor hiade 30, the ceke ieyer formed on top of the precoat layer is removed. the removed soiid material feiis by gravity into a box iiite chute with en intet 26 arranged peiow the doctor 'oiade BQ. 'the disc iiiter may aiso include iow pressure vvash showers ahd precoat renewai high pressure tet systern, forexample tre SQLiiRTTW' systern soid by Vairnet, but these ere not shovvrr as they piay no roie in vet egitation.Stationary iovv pressure iet systems with muitiple fan nozzies arranged on a beam are convehtionaily used toimplement e dispiacernent wash of the precoet. tvlovapie singie high pressure jet nozzte or nozzies are used toremove the precoat dovvn to the filter cioth. and subseqtient fiiter cycte will qutckiy fiii the exposed groove in theprecoat vvith fresiw and iinbiocked precoat. Hehce the totai precoat area couid thus be renevred in a continuous manner. 'the high pressurejet rnay aiso be so efficient that aiso the fiiter cioth obtains a cieaning effect. invehtive agitatiort systern KST15001SE_text prio.docx 5/8 As known in the prior art vviii solid rnateriai settle at the bottorn of the housing 1G and can be extrerrieiy difficult toremove and can cause mechanical problems. As vvill be explained first with reference to figures 3-7 will the inventive agitatlon system be explained.
    The inventive agitation systern a first nozzle (Ei) arranged between two coiiection chutes (26) andbetvveeri tvvo walls (Efia/Zfšb) these cliutes that are orierited paraiiei tfvith the filter surface of the filter' disc (12),and a second nozzie (32) is arranged at one ofthe walls (29b) ofthe collection chute oriented ortnogonally vviththe filter surface ofthe filter disc, and wherein both the first and second nozzles (31 and 32 respectiveiy) areoriehted such that the outflovv (41 and 42 respectlvely) from the nozzies coihcides and are paraiiel to theserriicirctiiar form of the vat. The firat nozzie (Si) is arranged in a circurriferential position the semiclrcuiarbottom at an angular position (d) at least degrees ahead ofthe second nozzle (322), and at the most 9G degrees ahead ofthe second nozzie (32).
    As could be seen in figure 3 is the first nozzie (_31) is arranged a vertical plana crosslng the shaft (f t) that also intersects with a 12, thus irijectirig flow towards the outer periphery of the disc.
    A recirculation system is connected to one of the first and second nozzles (31 and 32 respectiveiy), comprlsing aninlet the val for extracting a part of the suspension l-:ept in the vat, a piping system connecting the inlet with thenozzie concern, and a pump in said piplng system. As could be seen in figure 6 is the recircuiation systembreferablyf connected exciusiveiy to the second nozzle (32). 'the iniet may preferaply located close to liquid ievei Lier so that the suction from the iniet may assist in establishrrierit of the agitation flow over the vat bottorn.
    As shovvn in figure 7 rnay also the second nozzie (32e) be an eductor nozzle located adliacent the »vall (ZQa) ofthe collection chute oriented orthogonally vvith the filter surface of the filter disc (12).The eductor 'will bothvvithdraw fine partlcles that settles along the wall (IPQa) tovvards the bottom, and assists in establishing a toroidsnaped flow the vat. As aiso shot/vn in figure 7 is a feed system for feeding a raw suspension vrith fine particlerriaterial connected to one ofthe first and second nozzles (31 and 32 respectively), and in this ernbodirnent excluslvely to the first nozzie (31).
    As indicated figure Y, the rotatlng shaft of the disc filter is connected to a drive iinit (14) that rotates the and the associated filter discs such that the rotational direction (ROT) of the discs coincides vvitit the outflow directions (41 and 42 respectively) of the first and second nozzles (Si and 32 respectiveiyf). ln figures 8 and 9 are comparisons between a prior art eductor (49), Fig. 8, similar to t/t/O98/”l62Q2, and theinvention. Fig. been made. As ciearly shown in Figß the maximal turbulent zone 'TZMAX established in thevery center of the vat, while only an. residual agltation flow finally reach the settling zone ln order to establlsha stitficierit residual agitatiori flow also in the settling zone must the total flow from the eductor be quite According to the invention, as shown in Figfšr, is the maximal turbulent zone TZiViAX instead established in the very settling zone S2, i.e. the lowermost point of the vat where the settling flow of particles tends to reach. in tests of the invention. the effectiveness of invention was proved as only 4 mil/h was recircuiated a discvvith a diameter of4 rrieter in order to estahiish nori settling conditions. lri previous designs as as Ziinlïi/hwas recircuiated to the filter for dilution. l-lence, the rriecnanicai impact on fine particles the slurry was reducedto 1/5-th (ie. to 2094,). lNhen using an eductor in the second nozzle (32e). the velocity at the throat section 'was aboiit 6.5 in/s at a rate of 63 l/m for most favorabie anti settling function. i/Vliile preferred ernbodirnerits have been stiovvn and described, various rnodifications and stibstitutions rnay befriade thereto without departlng from the spirit and scope of the invention. Hence, the reclrculation system and the feed system may be exchanged between first and second nozzies, vvhile the preferred idea to use one of the KST15001SE_text prio.docx 6/8 nozzies for recirctaiatiori fiow rnay stiii apptied. Att nozzies :rtayf be optimized in order to estabiistt a strorgcohereht fiovi/ and eductors may be used for both first and second hozzte. Atso, even if nozzies are arranged onefor each disc and one for each chute, some positions rnay lack a nozzie. such that each second position rnay lacka first or second nozzie. Åctivatioh of each one of the first and second nozztes rnay aiso be regulated betweentotai shut ofr" and intensified fiow, Leusing up to “H30 f/O of recirouiation ftow for only or some of the second nozztes.
    Accorciingty, is to be understood that the present invention has been described by way of iiiustration and not iirritëatšon.
    KST15001SE_text prio.docx
    权利要求:
    Claims (9)
    [1] 1. An agitator system for a vat in a disc fiiter (t) iised to fiiter out fine particie materia! in a ravv suspensioncomprising a rotating snaft (11) with a rnuitittide of filter disc (12) rotating in a vat with at ieast asernicircular bottom wait (ttta) iocated bottom part oftre fiiter, a doctor biade arrangerrrent (30)parallei with the fiiter surface of the fiiter disc (12), and a collection ctrute iocated under the doctor' hiadeand forrhing a substantially vertical box coliection chute iivith an upper opening (26) under the doctorhiade and a lower outlet (27) in the tower part of the semicircuiai' bottom part of the vat, said box iikecoiiection chute having two 'walls (Zßa/Zâšh) oriented paraiiei with the filter surface of the fiiter disc andtvrfo trraiis (29a/29h) oriented orthogonaiiy with the surface of the fiiter disc cnaracterized in that afirst nozzie (31) is arranged hetweer tvi/o chutes and between two »valts (28a/28h) ofthesechutes that are orierted paraiiei tfvith the filter strrface of the disc and a second nozzie (32) isarranged at one of the vvaiis (29b) of the coliection chute oriented orthogonaiiy vi/ith the fiiter surface ofthe disc, and wherein hoth the first and second nozzies (31 and 32 respectiveiy) are oriented such tnat the outfiow trorn the nozzies coincides and are paraiiel to the semicircuiar form ofthe vat. An agitator system according to claim i characierized in that the first nozzle (31) is arranged in acircurnfereittiai position in the semicircular bottom at an anguiar position (d) at least 5 degrees ahead of the second nozziie (32), and at the most 90 degrees ahead of the secorwd nozzie (32). An agitator system according to claim 2 ciraracterized in that the first nozzle (St) is arranged in avertical piane crossing the shaft (tt) that also intersects vvith a disc (12), thus injecting fiow towards the outer periphery of the disc. An agitator system according to claim 2 characierized in that a recircuiation system is connected to oneof the first and second nozzles (31 and 32 respectiveiy), cornprising an iniet in the vat for extracting apart of the suspension kept the vat. a piping systern (33) connecting the intet 'with the nozzie in concern, and a pump (34) in said pipirrg An agitator system according to clairn 4 cnaracterized in that the recircuiation system is connected exciusiveiy to the second nozzle (32). An agitator system according to claim 5 characierized in that the second nozzle (32) is an eductornozzle located adjacent the iii/att (Zäta) of the collection chute oriented orthogonally with the filter surface of the filter disc. An agitator system according to claim 'i ciraracterized in that a feed system (3536) for feeding a rawsuspension with fine particie ntateriai is connected to one of the first and second nozzies (31 and 32 respectively). An agitator' systern according to clairn 7 characterizeri in that the feed systern is excidsiveiy connectedto the first nozzle (åt). Ari agitator systern according to clairn t ciraracterized in that the rotating shaft of the disc fiiter isconnected to drive unit that rotates the shatt arrd the associated fiiter discs such that rotationai direction(ROT) of the discs coincides irr/ith tre outfiow direction (41 and 42 respectiveiy) of the first and secord nozzles (31 and 32 respectively). KST15001SE_text prio.docx
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB348556A|1928-12-10|1931-05-11|Oliver United Filters Inc|Improvements in and relating to the filtration of liquids|
    ID23778A|1996-10-15|2000-05-11|Baker Hughes Inc|STEERING TOOLS FOR USE WITH DISTRICT SHAPED FILES|
    US7005067B2|2000-12-12|2006-02-28|Gl&V Management Hungary Kft|Disc-type filtration apparatus including discharge collector internal to pressure vessel and method filtration|
    SE534913C2|2010-06-16|2012-02-14|Rioks Patenter Ab|Disc filter|
    KR101035150B1|2011-04-07|2011-05-17|윤상진|Filtering and drying apparatus for wastes recycling|
    DE102012213769A1|2012-08-03|2014-02-06|Voith Patent Gmbh|disc filter|SE1750424A1|2017-04-07|2018-09-25|Valmet Oy|Pressurized disc filter for causticization liquors containing lime mud|
    DE102018113804A1|2018-06-11|2019-12-12|Voith Patent Gmbh|disc filter|
    CN112566708A|2018-08-10|2021-03-26|凯登百利可乐生有限公司|Disc filter and method for operating a disc filter|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1550999A|SE538959C2|2015-07-09|2015-07-09|Agitator system for a disc filter|SE1550999A| SE538959C2|2015-07-09|2015-07-09|Agitator system for a disc filter|
    PCT/SE2016/050702| WO2017007417A1|2015-07-09|2016-07-07|Agitator system for a disc filter|
    CN201680040647.4A| CN107847829B|2015-07-09|2016-07-07|Stirrer system of disc filter|
    EP16821745.3A| EP3319707A4|2015-07-09|2016-07-07|Agitator system for a disc filter|
    BR112018000422A| BR112018000422A2|2015-07-09|2016-07-07|agitator system for a disc filter|
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