WO1997018025A1 - Separateur a plaques equipe de plaques mobiles - Google Patents

Separateur a plaques equipe de plaques mobiles Download PDF

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Publication number
WO1997018025A1
WO1997018025A1 PCT/SE1996/001495 SE9601495W WO9718025A1 WO 1997018025 A1 WO1997018025 A1 WO 1997018025A1 SE 9601495 W SE9601495 W SE 9601495W WO 9718025 A1 WO9718025 A1 WO 9718025A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamellae
liquid
container
lamella
flow
Prior art date
Application number
PCT/SE1996/001495
Other languages
English (en)
Inventor
Anders Hansen
Ulf Ericson
Original Assignee
Anders Hansen
Ulf Ericson
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Anders Hansen, Ulf Ericson filed Critical Anders Hansen
Publication of WO1997018025A1 publication Critical patent/WO1997018025A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0051—Plurality of tube like channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0045—Plurality of essentially parallel plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0057—Settling tanks provided with contact surfaces, e.g. baffles, particles with counter-current flow direction of liquid and solid particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0069—Making of contact surfaces, structural details, materials therefor
    • B01D21/0072—Means for adjusting, moving or controlling the position or inclination of the contact surfaces, e.g. for optimising the particle-liquid separation, for removing the settled particles, for preventing fouling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls

Definitions

  • Sedimentation is an often employed technique for separating suspended material from liquids in industrial processes.
  • the present invention relates to an apparatus and a method which includes sedimentation for separating material (particles) which is suspended in a liquid.
  • sedimentation for separating material (particles) which is suspended in a liquid.
  • sludge will be often employed without any restrictive meaning for designating the material which is separated from the liquid.
  • the apparatus is also suitable for separating two liquids of different densities from one another.
  • the sedimentation cycle does not entirely comply with the surface treatment theory, which presupposes laminary and stable flow. Disruptions of various types occur in the sedimentation basins, for example strata flow, return flow at the inlet, and so on. In general, no more than approximately 60% sedimentation effect is achieved in the use of sedimentation basins as compared with the theoretical value. In dimensioning of sedimentation basins, it is therefore necessary that the liquid be given a considerably longer flow path than that which is theoretically sufficient to achieve the desired sedimentation effect.
  • the present invention relates to an apparatus and a method in which the above-outlined needs are satisfied. This is put into effect employing the technique disclosed in the characterizing clauses of the independent claims.
  • the apparatus (the separator) according to the invention includes sec ⁇ tions in which a concurrent sedimentation takes place and sections in which a countercurrent sedimentation takes place.
  • the apparatus is pro ⁇ vided with movable lamellae whose position is changed such that sedi- mentation between two adjacent lamellae alternatingly takes place con ⁇ currently and countercurrently. This switching between countercurrent and concurrent sedimentation entails that the apparatus is self-clean ⁇ ing.
  • the separator according to the present in- vention utilizes as good as all of its liquid height for sedimentation, which maximizes the separation capability per unit of volume and mini ⁇ mizes the risk of flotation.
  • the effective utilisation of the liquid height is achieved in that the liquid is forced to follow a path where the spaces or chambers which the lamellae form between them are con- nected in series in terms of flow.
  • the chambers are connected in parallel in terms of flow, which entails an extremely effective emptying of the chambers.
  • the space between the lamellae varies depending upon the position of the lamellae.
  • the lamellae are disposed such that the flow area is greatest in those spaces where sedimentation takes place countercur- rently, for which reason the flow rate will be lower in the countercur ⁇ rent separation than in the concurrent separation.
  • the lamella angle in relation to the liquid surface is thus greater in the countercurrent space than in the concurrent space, which assists the sedimentation cycle.
  • Fig. 1 is a cross section through the apparatus, with the lamel ⁇ lae of the apparatus in a first position
  • Fig. 2 is a cross section through the apparatus corresponding to the section of Fig. 1, with the lamellae of the apparatus in a second position;
  • Fig. 4 is a cross section through the apparatus corresponding to the section of Fig. 2 with the apparatus set for removal of sediment separated from the liquid;
  • Fig. 5 is a cross section corresponding to Fig. 2, showing one embodiment of the apparatus with elastically resilient la- ellae;
  • Fig. 6 is a cross section through one embodiment employing fixed lamellae
  • Figs. 7a-c show a cross section corresponding to the previous sec ⁇ tions in which the lamellae are straight.
  • the apparatus includes a tank or container 14 in which particles dispersed in the liquid are separated from the liquid, or liquids of different densities are separated from one another.
  • the container 14 has a substantially rectangular or quadratic inner configuration.
  • An inlet pipe 1 for the liquid containing the particles or for the mixture of liquids of dif ⁇ ferent densities leads to the container 14, the pipe 1 discharging in an inlet 9 in the bottom section 23 of the container 14.
  • the upper sec ⁇ tion 22 of the container is provided with an outlet 10 which is gener ⁇ ally designed as a spillway overflow 10.
  • the apparatus will be described hereinbelow when it is employed for separating particles suspended in the liquid, but it will be obvious to the skilled reader of this speci ⁇ fication that, in a mixture of liquids of different densities, the liquids will separate into strata when the liquid of the greater den ⁇ sity sinks down in a manner corresponding to that which applies for particles which are suspended in a liquid and which are of greater den ⁇ sity than the liquid itself.
  • the inlet 9 of the container and/or means 8 cooperating with the inlet are disposed such that the liquid supplied to the container is to be spread (distributed) such that the infed liquid forms a calm and uniform flow from the bottom section 23 of the container to its upper section 22.
  • a spreader 8 is designed as a substantially planar plate which forms passages 19 between its opposing edges 16 and the in ⁇ ner defining walls 20 of the container.
  • the plate is disposed to spread the flow of the supplied liquid out towards the edges of the plate and in order thereby to ensure the desired slow and uniform flow of liquid from the bottom section 23 of the container to the spillway overflow 10.
  • the spreader 8 consists of two discs 8a,b which make an angle with one another and are placed a short distance above the mouth 24 of the inlet 9.
  • the discs form a roof-like construction with the angle apex facing upwards, and disposed centrally above the inlet 9.
  • the lower edges 16 of the discs are shown in the Figures as drawn down so that the edges are located on a level which is lower than the level of the mouth of the inlet 9.
  • a first sludge pocket 6, hereinafter also designated bottom sludge pocket 6, is disposed in the bottom section 23 of the container.
  • the bottom sludge pocket is disposed on a lower level than the mouth 24 of the inlet.
  • the inlet 9 passes through the bottom sludge pocket.
  • the bottom 21 of the container forms the bot ⁇ tom sludge pocket 6 which has bottom surfaces with a slope which leads sludge accumulated in the pocket towards a sludge outlet 7.
  • a valve (not shown) is provided for opening and closing the sludge outlet 7 at suitable times, as will be described in greater detail hereinbelow in connection with the description of an operational cycle for the ap ⁇ paratus.
  • a number of movable lamellae 13 are disposed above the inlet 9.
  • the lamellae are dis ⁇ posed above the spreader.
  • the lamellae are four in number, but this number varies from one embodiment of the present invention to another.
  • the number of lamellae 13 is essentially determined by the distance it is desired that the liquid flow is to pass before leaving the container 14. The desired distance is deter ⁇ mined, amongst other things, by the expected concentration of sludge in the liquid which is supplied into the apparatus and the purity which it is desired to attain for the liquid which departs from the apparatus.
  • all movable lamellae 13 are of cor ⁇ responding construction.
  • the lamella 13 consists of two lamella panels 15a,b united with one another so as to make an angle ⁇ .
  • the lamellae 13 are of one piece construction in that, for example, a plate is bent to the desired angle ⁇ .
  • the tip of the thus formed angle in the lamellae 13 is, with the lamellae placed in the container, directed upwards.
  • the lamellae are arranged such that their upper edge 26 slopes a few degrees towards the horizontal in order that possible air bubbles do not remain in the fold of the la ⁇ mella.
  • the lamellae 13 are manufactured in that two lamella panels 15a,b are joined together for forming the desired angle , this angle being approx. 95° in the illustrated embodiment.
  • the panels 15a,b of the la ⁇ mellae are somewhat flexible in order to permit a certain bending in connection with the switching between different positions as described below. It will be apparent from the Figure that the lamella panels, on abutment against the wall 17 of the container, bend slightly while the lamella panels return to an almost planar form when the panels are re ⁇ moved from the wall of the container.
  • the lamellae may also be made of plastic material. In order to avoid the risk that sludge adheres to the lamellae, a non-hydrophilic ma ⁇ terial is selected. Lamellae of metal are generally provided with a coating of non-hydrophilic material.
  • the expression lamella 13 is taken, in this description, to signify the entire lamella, and the expression lamella panel 15a,b is taken to signify a part of the lamella 13, namely that part which, in the creased or folded lamella, extends from the angle apex to the one lower edge of the lamella, irrespective of how the lamella 13 is manufactured or constructed (cf. Figs. 1-5).
  • the expressions lamella and lamella panel, respectively, are employed irrespective of whether the lamella is of one piece manufacture or whether it is composed of several parts.
  • the lamellae 13 are of a length which corresponds to the inner length of the container 14, this length relating to the extent at right angles to the plane of the paper in the Figures. This implies that, when the lamellae 13 have, for example, assumed the position according to Fig. 1, the liquid flow may only pass in the gap formed in the longitudinal direction between each respective lamella 13 and the one wall of the container 14.
  • the lamellae 13 are connected to drive means 12 which are disposed to pivot or rotate the lamellae 13 between two extreme positions about a neutral position in which the lamella panels make a substantially equal angles with the vertical plane.
  • the one lamella panel 15a lies against the wall of the container 14, and in the other extreme position, the other lamellae panel 15b lies against the opposing wall of the container 14.
  • the lamellae 13 may assume any posi- tion whatever between these two extreme positions. As a rule, in the extreme positions the lamellae are rotated through approx. 15° from the neutral position.
  • the spaces between adjacent lamella panels 15a,15b will alternatingly function as countercurrent chamber 2 and concurrent chamber 4.
  • the space between two adjacent lamella panels is changed from, for example, having been a countercurrent cham ⁇ ber 2 to being a concurrent chamber 4.
  • the settled particles are generally moved always in the same direction, irrespective of whether the rel- evant space at that time functions as a concurrent chamber 4 or as countercurrent chamber 2, while the direction of flow of the liquid varies. Because the flow direction of the liquid changes, the risk is reduced that settled material stays and becomes attached to the lamel ⁇ lae 13, a factor which greatly improves the function of the separator and lengthens the interval between cleaning operations.
  • the embodiment in which the lamella panels are elastically resilient enjoys the advantage that the demand on tolerances in manufacture is reduced, at the same time as a substantially tight abutment against the wall 17 of the container is obtained, whereby the sediment which is ac ⁇ cumulated in the lamella pockets 5 which the lamella panels form does not leak out from the pockets.
  • the employment of elastically resilient lamellae also makes it possible, in certain embodiments, to use con ⁇ tainers of a substantially circular cross section.
  • the configurational change of the lamella panels when they are moved to or from their ex ⁇ treme positions also implies that sediment which might possibly adhere to the panels is released from them.
  • the cross section between the lamella panels 15a,b i.e. the flow area, is greater in the countercurrent chambers 2 than in the concurrent chambers 4.
  • the flow rate will hereby be lower in countercurrent separation than in concurrent separation.
  • This may also be expressed such that the angle of the lamella panels 15a,b in relation to the liquid surface 11 is greater in the countercurrent chambers 2 than in the concurrent chambers 4 for those lamellae which form the lower defi ⁇ nition of each respective chamber.
  • the angle between the lamella panels 15a,b and the liquid surface varies between approx. 30°, preferably 35° and approx. 60°, preferably approx. 50°.
  • the smaller angle (approx. 30° or 35°) relates to a situ- ation when the lamella panels 15a,b constitute the lower region of a concurrent chamber 4 and the larger angle (approx. 60° or 50°) relate to the situation when the lamella panels 15a,b constitute the lower region of a countercurrent chamber 2. In the emptying position, the angle lies between 35° and 50°.
  • Liquid carrying sludge which is fed into the container 14 ⁇ cf . Fig. 1) via the inlet 9 is forced, in a first stage, around the fixed spreader 8 which prevents vertical liquid flow. This continues past the edges 16 of the spreader and, once a portion of the flow has passed above the spreader, the flow continues upwards and in between the two lowermost, movable lamellae 13. In Fig. 1, these are shown in positions such that the space between the two first lamella panels 15a which the liquid flow meets forms a countercurrent chamber 2.
  • Sludge which is separated in this space settles towards the lamella panel 15a of the first lamella and then slides down along the lamella panel 15b in order, at least in part, to be accumulated in the bottom sludge pocket 6.
  • the liquid flow has passed the tip (upper edge) of the first lamella, it passes into a concurrent chamber 4. Since the distance between the lamella panels 15a,15b is less in this space 4, the flow rate increases.
  • Sludge which is separated in the space sinks down to contact against the lamella panel 15b of the lowermost lamella and then slides along this panel down into the lamella sludge pocket 5 which the lowermost lamella panel forms with the wall 17 of the container.
  • the liquid flow thereafter continues around the edge 25 of the second lamella panel and through the passage 19 into a countercurrent chamber 2 formed between the second and third movable lamellae 13 (counting from below).
  • the sediment which is formed against the lamella panel 15b of the second lamella slides off the panel and generally sinks down to the sludge pocket 5 disclosed in the preceding paragraph.
  • the size of the passage 19, and thereby the flow rate of the liquid is selected generally such that the particles go through the passage 19 and there ⁇ after sink down to the lamella sludge pocket 5.
  • the flow then continues over the upper edge of the second lamella to a concurrent flow space 4 where sludge is accumulated in a second lamella sludge pocket 5.
  • the liquid flow continues alternatingly to pass countercurrent flow chambers 2 and concurrent flow chambers 4.
  • the number of lamellae 13 which are provided in each individual case, and thereby the number of concurrent and countercurrent flow spaces which are passed will above all depend upon the nature of the sludge and the desired degree of separation.
  • Fig. 2 shows step two of the operational cycle.
  • the inflow of liquid containing dispersed particles is discontinued.
  • the lamella sludge pockets 5 are opened and the sediment sinks from these along the walls 17 of the container down to the bottom sludge pocket 6. Because the inflow of liquid to the con ⁇ tainer has ceased, there will be no liquid flow which disturbs the movement of the sediment to the bottom sludge pocket.
  • stage 3 Fig. 3
  • the lamellae are switched from the neutral posi ⁇ tion to their second extreme positions, i.e.
  • stage 4 (Fig. 4) the inflow of liquid containing dispersed particles is once again discontinued.
  • the lamellae are set in the neutral position, whereby the lamella sludge pockets 5 are opened and the sediment sinks to the bottom sludge pocket 6.
  • the bottom valve is opened and the particles from the secondary sludge pocket 6 are removed from the container 14 via the sludge outlet 7.
  • the bottom valve may also be opened in stage two in accordance with the above.
  • the separator is allowed to pass stages 1-4 several times before the bottom sludge pocket is emptied of its contents.
  • Reference numeral 11 relates in the Figures to the position of the liquid level in the container 14 during the different stages in accord- ance with the foregoing description.
  • each individual lamella panel 15a,b in the lamellae 13 is rotary.
  • the lowermost, movable lamella constitutes the means 8 which form the spreader 8.
  • stage 3 is not employed, i.e. the lamellae 13 return to the earlier position, this giving a simpler regulation of the driving operation.
  • stage 3 is, however, that the separator will not be self-cleaning in that the individual spaces between the lamella panels 13 do not switch between being concurrent and countercurrent flow chambers.
  • Fig. 6 shows one embodiment of the apparatus in which the lamellae 13 are immobile, in other words have spatially fixed positions.
  • the lamel ⁇ lae are sealingly connected to both of the opposing walls 27 which interconnect the walls 17 which are provided with oblique lines in the Figures.
  • the opposing edges 25 of the lamellae are disposed a distance from the opposing walls 17 of the container.
  • a number of mechanical closure devices 28 are placed on carriers 29 whose displacement is realized by drive means 12a.
  • Fig. 6 shows the apparatus provided with four lamellae 13.
  • the drive means 12a have moved the right-hand carrier 29 in the Figure downwards, while the left-hand carrier has been moved upwards.
  • the closure devices of the right-hand carrier are thereby set such that two of the passages between the wall 17 and the lamellae 13 are closed, namely (counting upwards from beneath) that at the second lamella and that at the fourth lamella.
  • the closure devices of the left-hand carrier are set such that the passages at the first lamella and the third lamella are closed. There will hereby be formed between the lamellae spaces which are dis ⁇ posed in series in flow terms through which the liquid passes.
  • the closure de ⁇ vices of the left-hand carrier are set such that the passages at the second and the fourth lamellae are closed
  • the closure devices of the right-hand carrier are set such that the passages at the first and third lamellae are closed.
  • the flow direction is opposed to that which is ob ⁇ tained in the placing of the closure devices as disclosed in the pre ⁇ ceding paragraph.
  • closure devices 28 are turned by drive means (not shown in the Figure) to an orientation where they are substan ⁇ tially parallel with the wall of the container. In such instance, the lamella sludge pockets 5 are opened and the sediment sinks to the bot ⁇ tom sludge pocket 6.
  • Figs. 7a and 7b show one embodiment in which the lamellae are substan- tially planar.
  • the lamellae are disposed to be displaced while retain ⁇ ing their orientation substantially horizontally in the container 14. Every second lamella is interconnected with a displacement device (not shown in the Drawings) in order to form a composite system of lamellae which are displaced simultaneously.
  • a displacement device not shown in the Drawings
  • the first, the third, the fifth and the seventh lamellae counting upwards from beneath
  • the second, the fourth and the sixth la ⁇ mellae have been moved to the left.
  • the flow area is, in certain embodiments, adapted for those spaces which are formed between the lamellae so that, for example, the flow area is greater in countercurrent sedimentation than in concurrent sedi ⁇ mentation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)
  • Cyclones (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

Appareil et méthode de séparation de particules dans un liquide ou de séparation entre liquides de différentes densités. L'appareil comporte un récipient (14) muni d'une entrée (9) dans sa région basse destiné à un liquide contenant des particules ou à un mélange de liquides de différentes densités, et à une sortie (10) dans sa région supérieure pour le liquide surnageant. Une poche de fond (6) accumule les particules ou les liquides séparés par décantation. La poche de fond est munie d'un orifice de sortie (7). Au moins deux lamelles coudées, pouvant être basculées (13) sont disposées entre l'orifice d'entrée (9) destiné au liquide et l'orifice de sortie (7) destiné au liquide surnageant. Il existe des espaces (2, 4) reliés en série entre les lamelles coudées. D'après ce procédé, les lamelles (13) sont disposées de telle façon que la séparation par décantation se produit alternativement dans des chambres d'écoulement dans le sens du courant (2) et dans des chambres d'écoulement à contre-courant (4). Les particules ou le liquide décantés se déplacent le long des lamelles jusqu'à deux parois opposées du récipient, puis progressent le long de ces parois jusqu'à atteindre la poche de fond (6). Celle-ci est vidée de son contenu par l'orifice de sortie (7).
PCT/SE1996/001495 1995-11-16 1996-11-18 Separateur a plaques equipe de plaques mobiles WO1997018025A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504121-6 1995-11-16
SE9504121A SE505662C2 (sv) 1995-11-16 1995-11-16 Plattseparator för separation av fasta partiklar eller vätska från en vätskesuspension

Publications (1)

Publication Number Publication Date
WO1997018025A1 true WO1997018025A1 (fr) 1997-05-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001495 WO1997018025A1 (fr) 1995-11-16 1996-11-18 Separateur a plaques equipe de plaques mobiles

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SE (1) SE505662C2 (fr)
WO (1) WO1997018025A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031347A1 (fr) * 1997-12-03 1999-06-24 Abb Research Ltd. Conception d'un separateur
CN107628658A (zh) * 2017-10-31 2018-01-26 重庆洁邦电器有限公司 一种具有防窜水结构的多级水箱
CN107671096A (zh) * 2017-10-31 2018-02-09 重庆洁邦电器有限公司 一种包括自洁循环水箱的清洗机
EP3149320B1 (fr) * 2014-05-27 2020-03-11 PSA Automobiles SA Boîtier de décantation par gravité pour un circuit de circulation de liquide

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195554A (en) * 1986-07-21 1988-04-13 Brian Denis Waring Ridged plate separator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195554A (en) * 1986-07-21 1988-04-13 Brian Denis Waring Ridged plate separator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999031347A1 (fr) * 1997-12-03 1999-06-24 Abb Research Ltd. Conception d'un separateur
US6350375B1 (en) 1997-12-03 2002-02-26 Abb Research Ltd. Arrangement in a separator
EP3149320B1 (fr) * 2014-05-27 2020-03-11 PSA Automobiles SA Boîtier de décantation par gravité pour un circuit de circulation de liquide
CN107628658A (zh) * 2017-10-31 2018-01-26 重庆洁邦电器有限公司 一种具有防窜水结构的多级水箱
CN107671096A (zh) * 2017-10-31 2018-02-09 重庆洁邦电器有限公司 一种包括自洁循环水箱的清洗机

Also Published As

Publication number Publication date
SE505662C2 (sv) 1997-09-29
SE9504121L (sv) 1997-05-17
SE9504121D0 (sv) 1995-11-16

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