WO2020157383A1 - Chambre de rejet d'un épurateur centrifuge et épurateur centrifuge - Google Patents
Chambre de rejet d'un épurateur centrifuge et épurateur centrifuge Download PDFInfo
- Publication number
- WO2020157383A1 WO2020157383A1 PCT/FI2020/050051 FI2020050051W WO2020157383A1 WO 2020157383 A1 WO2020157383 A1 WO 2020157383A1 FI 2020050051 W FI2020050051 W FI 2020050051W WO 2020157383 A1 WO2020157383 A1 WO 2020157383A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dilution
- reject
- nozzle
- reject chamber
- chamber
- Prior art date
Links
- 238000010790 dilution Methods 0.000 claims abstract description 98
- 239000012895 dilution Substances 0.000 claims abstract description 98
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/22—Apparatus in which the axial direction of the vortex is reversed with cleaning means
- B04C5/23—Apparatus in which the axial direction of the vortex is reversed with cleaning means using liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
- B04C5/18—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with auxiliary fluid assisting discharge
-
- 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
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
- D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
Definitions
- the invention relates to centrifugal cleaners and their reject chambers, which reject chambers have at least one dilution nozzle.
- Centrifugal cleaners like hydrocyclones are known to be diluted at their bottom areas by many different ways.
- CA885026 discloses a dilution flow to the reject chamber of the cleaner.
- US4696737 discloses a hydrocyclone, which has an additional low solids flow tangentially cocurrently applied under the cone of the cyclone. Lightest particles will flow back to the primary cyclone and to an accept outlet.
- US4151083 discloses a countercurrent dilution flow, which will minimize the vortex flow within a reject chamber for promoting separation efficiency of heavy impurities.
- US2927693 discloses a tangential cocurrent dilution feed and a tangential reject outlet for enhancing the separation.
- EP1509331 discloses a central dilution nozzle, which extends a central dilution arrangement up to inside the cone interior.
- US2953248 discloses an arrangement for temporary dilution for cleaning a reject outlet of a centrifugal cleaner. The dilution flow cyclically blows out blocking particles from the reject outlet.
- Centrifugal cleaners comprises normally three main parts: A top feed part, a cone and a reject chamber.
- the cleaners are often arranged in tight banks, which have plenty of cleaners. Then they are often arranged so that every second cleaner has a different direction of vortex which saves space and makes arrangement of conduits easier.
- the parts will wear and they are replaced at certain intervals. Having two similar but not interchangeable parts produce confusion and errors within limited servicing schedules.
- a dilution nozzle which extends up to the cone of the cleaner will partially block the bottom of the cone.
- a cleaner should be operating constantly without blockages, which will cause quality losses and capacity problems.
- a new way of slowing the vortex within the reject chamber has been developed. At least one sharp dilution fluid flow is directed outwards from a central dilution arrangement across the vortex flow coming from the cone part of the cleaner to the reject chamber. The dilution flow acts like an obstacle or a stick in the vortex flow and will slow it down.
- the reject chamber and dilution arrangement according to the invention is defined in detail by the claim 1 and a centrifugal cleaner having the inventive reject chamber and dilution arrangement is defined in claim 9.
- the reject chamber has a central dilution arrangement, which has at least one dilution nozzle for delivery of dilution fluid to the reject chamber and the reject chamber has a reject outlet at the bottom of the reject chamber.
- the at least one dilution nozzle sprays the dilution fluid flow across the annular space below the cone of the centrifugal cleaner, the circulating motion of fluid coming from the cone of the centrifugal cleaner to the reject chamber slows down.
- the flow of dilution water will go to outer periphery of the reject chamber and as the vortex is slower, lightest particles are able to move to the top center of the reject chamber and then go up to the accept outlet.
- the slowing of the vortex also reduces the wear of the reject chamber.
- the suspension may contain particles of filler material.
- the light filler particles can be better recovered from treated suspension.
- the vortex is slowed within the reject chamber and the vortex in the cone is not affected, smallest reject particles have more time to separate out of accept flow.
- the dilution arrangement has also a clearing nozzle, which is directed against the reject outlet, the flow of dilution fluid will keep the reject outlet clear of rejected particles. The same central dilution arrangement can thus perform also the cleaning task and only one dilution inlet is needed.
- the dilution arrangement can handle both vortex directions, if one sole dilution nozzle is at the opposite side of the dilution arrangement than the clearing nozzle and/or the reject outlet. If there are several dilution nozzles, they preferably are symmetrically aligned and the plane of symmetry is defined by the center of the reject outlet and the central axis of the dilution arrangement. If the reject outlet is asymmetrically positioned to the reject chamber, then the dilution and/or the cleaner nozzles may also be asymmetrically aligned and/or positioned for optimizing the process.
- the dilution arrangement When the dilution arrangement does not extend up higher than the bottom end of the cone of the centrifugal cleaner, it will not block the upflow of the lightest particles to the accept outlet.
- the low dilution arrangement also helps avoiding blockages of rejected particles at the entrance of the reject chamber.
- the dilution nozzles are easiest to manufacture when their horizontal axis point outward to radial direction. Still especially with asymmetric dilution arrangement, a horizontal alignment of the dilution nozzles against the direction of vortex can increase the slowing effect a bit. The alignment should horizontally differ less than 45 degrees from the direction of the inside radius of the dilution arrangement.
- the flow of dilution fluid from dilution nozzles should be targeted to flow below the cone of the cleaner, but the length of the flow of dilution fluid should be short to be still effective at the outermost end of the flow where the vortex is strongest.
- a zero degrees horizontal alignment of the dilution nozzle should normally produce the shortest distance to the wall of the reject chamber. As the dilution nozzle will be under the bottom end of the cone, it may have to be targeted upwards to have effect suitable close to the end of the cone.
- the vertical alignment angle should be less than 60 degrees upwards from the horizontal plane. Most preferably the vertical alignment angle should be less than 45 degrees upwards for avoiding upward flow of dilution fluid. The actual optimal angle depends on the contour of the opposite wall. When the flow hits the opposite wall, it should be diverted mostly downwards. Manufacturing of the nozzles have the widest manufacturing process options, if a dilution nozzle and the clearing nozzle have the same central axis with the reject outlet.
- Fig. 1 illustrates vertically cut view of a bottom area of a centrifugal cleaner and Fig. 2 illustrates horizontally cut view of a dilution arrangement.
- centrifugal cleaners can be assembled in other than vertical attitudes, but in this disclosure, the mentioned orientations refer to the attached drawings.
- Fig. 1 illustrates cut view of a bottom area of a centrifugal cleaner.
- a reject chamber 1 is attached under a cone 2 of a centrifugal cleaner.
- On the bottom of the reject chamber 1 is a central dilution arrangement 3 and a reject outlet 7.
- a dilution inlet 8 leads dilution fluid into the dilution arrangement 3.
- a dilution nozzle 4 of the dilution arrangement 3 is aligned preferably upwards at an angle a and will accomplish a sharp outward flow of dilution fluid across an annular space 5 around the dilution arrangement 3.
- the dilution nozzle should be at the topmost part of the dilution arrangement 3.
- the bottom end 9 of the cone 2 is at the end of the conical cyclonic part, not at the lowest point of the outwards tapered end of the cone part, which will divert the dilution flow downwards and outwards.
- the dilution arrangement 3 can be an integral part of the reject chamber 1 or it can be an insert attached to it. The dilution arrangement 3 may not be aligned precisely at the symmetric center of the reject chamber 1 . A slightly asymmetric position relative to the inner walls of the reject chamber 1 may further optimize the separation characteristics by minimizing inflow of acceptable particles to the reject outlet 7.
- the dilution arrangement 3 has also a clearing nozzle 6.
- the clearing nozzle 6 is aligned to produce a sharp flow against a reject outlet 7. Then rejected particles will not build up a blockage on the reject outlet 7.
- the alignment preferably aims at the center of the reject outlet 7 but may also be aligned a bit upwards or downwards or aside of the center for optimizing the cleaning function.
- the dilution effect of the cleaning flow is reduced as the flow will go quite directly into the reject outlet 7.
- the dilution nozzle 4 and the clearing nozzle 6 have the same central axis with the reject outlet 7.
- the diameters of the dilution nozzle 4 and the clearing nozzle 6 do not have to be equal and their inner shapes can be slightly tapered or have other substantially tubular shapes for optimizing properties of outflow.
- the clearing nozzle 6 should be at a lower level than the dilution nozzle.
- Fig. 2 illustrates an embodiment of three dilution nozzles 4 with horizontal alignments having different pointing angles b.
- the angle b is formed between their horizontal central axis and radius R of the dilution arrangement 3.
- the dilution nozzles 4 are arranged symmetric.
- the plane of symmetry is defined by the center of the reject outlet 7 and the central axis of the dilution arrangement 3.
- the angles b of the nozzles may also be pointed differently than illustrated in fig. 2, for example against a specified vortex direction and to other vertical alignments.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cyclones (AREA)
Abstract
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021537064A JP7455128B2 (ja) | 2019-01-31 | 2020-01-30 | 遠心式クリーナーのリジェクト・チャンバ、及び遠心式クリーナー |
CA3124494A CA3124494A1 (fr) | 2019-01-31 | 2020-01-30 | Chambre de rejet d'un epurateur centrifuge et epurateur centrifuge |
BR112021012076-9A BR112021012076A2 (pt) | 2019-01-31 | 2020-01-30 | Uma câmara de rejeitos de um limpador centrífugo e um limpador centrífugo |
US17/427,462 US20220126307A1 (en) | 2019-01-31 | 2020-01-30 | A reject chamber of a centrifugal cleaner and a centrifugal cleaner |
EP20748323.1A EP3917679A4 (fr) | 2019-01-31 | 2020-01-30 | Chambre de rejet d'un épurateur centrifuge et épurateur centrifuge |
CN202080010781.6A CN113365736B (zh) | 2019-01-31 | 2020-01-30 | 离心清理器的废料室和离心清理器 |
AU2020215288A AU2020215288A1 (en) | 2019-01-31 | 2020-01-30 | A reject chamber of a centrifugal cleaner and a centrifugal cleaner |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962799144P | 2019-01-31 | 2019-01-31 | |
US62/799,144 | 2019-01-31 | ||
FI20195354A FI128719B (en) | 2019-05-02 | 2019-05-02 | Vortex cleaner reject chamber and vortex cleaner |
FI20195354 | 2019-05-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020157383A1 true WO2020157383A1 (fr) | 2020-08-06 |
Family
ID=71840928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2020/050051 WO2020157383A1 (fr) | 2019-01-31 | 2020-01-30 | Chambre de rejet d'un épurateur centrifuge et épurateur centrifuge |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2020157383A1 (fr) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2927693A (en) | 1955-03-10 | 1960-03-08 | Horace Freeman | Cleaning of paper pulp suspensions |
US2953248A (en) | 1956-03-28 | 1960-09-20 | Bird Machine Co | Apparatus for clearing restricted orifice |
CA885026A (en) | 1971-11-02 | L. Rastatter Edward | Vortex chamber reject control | |
US3785489A (en) * | 1971-07-14 | 1974-01-15 | Celleco Ab | Cyclone separator with underflow diluter |
US4151083A (en) | 1974-09-10 | 1979-04-24 | Dove Norman F | Apparatus and method for separating heavy impurities from feed stock |
US4696737A (en) | 1986-02-28 | 1987-09-29 | The Bauer Bros. Co. | Fiber recovery elutriating hydrocyclone |
US6284096B1 (en) * | 1999-07-06 | 2001-09-04 | Voith Sulzer Papiertechnik Patent Gmbh | Process for discharging impurities from a hydrocyclone and a hydrocyclone |
EP1509331A1 (fr) | 2002-05-27 | 2005-03-02 | GL & V Sweden AB | Separateur hydrocyclone |
WO2012062960A1 (fr) * | 2010-11-11 | 2012-05-18 | Metso Paper, Inc. | Structure de dilueur de fond dans un épurateur centrifuge et procédé dans une structure de dilueur de fond dans un épurateur centrifuge |
EP3018252A1 (fr) | 2014-11-07 | 2016-05-11 | GL&V Luxembourg S.a.r.l. | Hydrocyclone avec un dispositif de dilution bidirectionnel |
-
2020
- 2020-01-30 WO PCT/FI2020/050051 patent/WO2020157383A1/fr unknown
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA885026A (en) | 1971-11-02 | L. Rastatter Edward | Vortex chamber reject control | |
US2927693A (en) | 1955-03-10 | 1960-03-08 | Horace Freeman | Cleaning of paper pulp suspensions |
US2953248A (en) | 1956-03-28 | 1960-09-20 | Bird Machine Co | Apparatus for clearing restricted orifice |
US3785489A (en) * | 1971-07-14 | 1974-01-15 | Celleco Ab | Cyclone separator with underflow diluter |
US4151083A (en) | 1974-09-10 | 1979-04-24 | Dove Norman F | Apparatus and method for separating heavy impurities from feed stock |
US4696737A (en) | 1986-02-28 | 1987-09-29 | The Bauer Bros. Co. | Fiber recovery elutriating hydrocyclone |
US6284096B1 (en) * | 1999-07-06 | 2001-09-04 | Voith Sulzer Papiertechnik Patent Gmbh | Process for discharging impurities from a hydrocyclone and a hydrocyclone |
EP1509331A1 (fr) | 2002-05-27 | 2005-03-02 | GL & V Sweden AB | Separateur hydrocyclone |
EP1509331B1 (fr) * | 2002-05-27 | 2009-12-30 | GLV Finance Hungary Kft., Luxembourg branch | Separateur hydrocyclone |
WO2012062960A1 (fr) * | 2010-11-11 | 2012-05-18 | Metso Paper, Inc. | Structure de dilueur de fond dans un épurateur centrifuge et procédé dans une structure de dilueur de fond dans un épurateur centrifuge |
EP3018252A1 (fr) | 2014-11-07 | 2016-05-11 | GL&V Luxembourg S.a.r.l. | Hydrocyclone avec un dispositif de dilution bidirectionnel |
Non-Patent Citations (1)
Title |
---|
See also references of EP3917679A4 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1888248B1 (fr) | Unite hydrocyclone et procede de separation d une suspension de pate fibreuse contenant des contaminants relativements lourds | |
US8789709B2 (en) | Flow deflecting member for hydrocyclone | |
US7434694B1 (en) | Cyclone separator with stacked baffles | |
CA1288731C (fr) | Hydrocyclone separateur a recuperation de fibres | |
US6284096B1 (en) | Process for discharging impurities from a hydrocyclone and a hydrocyclone | |
EP3018252B1 (fr) | Hydrocyclone avec un dispositif de dilution bidirectionnel | |
AU1848300A (en) | Hydrocyclone with removal of misplaced coarse fraction in overflow | |
US3347372A (en) | Centrifugal cleaner | |
US20220126307A1 (en) | A reject chamber of a centrifugal cleaner and a centrifugal cleaner | |
WO2020157383A1 (fr) | Chambre de rejet d'un épurateur centrifuge et épurateur centrifuge | |
RU2810062C2 (ru) | Камера отходов центробежного очистителя и центробежный очиститель | |
US3358833A (en) | Centrifugal separator | |
US3404778A (en) | Hydrocyclone | |
KR100460551B1 (ko) | 리버스 하이드로사이클론, 리버스-플로우 하이드로사이클론 클리너, 및 리버스-플로우 사이클로닉 클리너 | |
US20230357989A1 (en) | Slurry cleaner systems with cleaner dilution devices and methods of cleaning slurries therewith | |
NO164756B (no) | Anordning og fremgangsmaate for fremstilling av borskruer. | |
WO1998047622A1 (fr) | Seuil de canalisation pour epurateur tourbillonnaire | |
CN113560029B (zh) | 用于从微粒悬浮体中分离颗粒的设备和方法 | |
CA1203779A (fr) | Decharges non circulaires pour cyclone separateur | |
US9861913B2 (en) | Centrifugal separator | |
CN117642538A (zh) | 从悬浮液中离心分离固体的水力旋流器装置 | |
GB2587003A (en) | An inlet section of a hydrocyclone, a hydrocyclone, use of a hydrocyclone and a plant comprising a hydrocyclone | |
CA2228975C (fr) | Epurateur a hydrocyclone inverse a retenue prolongee | |
JPH0260385B2 (fr) | ||
KR20050024291A (ko) | 하이드로싸이클론 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20748323 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 3124494 Country of ref document: CA |
|
ENP | Entry into the national phase |
Ref document number: 2021537064 Country of ref document: JP Kind code of ref document: A |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112021012076 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 2020215288 Country of ref document: AU Date of ref document: 20200130 Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2020748323 Country of ref document: EP Effective date: 20210831 |
|
ENP | Entry into the national phase |
Ref document number: 112021012076 Country of ref document: BR Kind code of ref document: A2 Effective date: 20210618 |