EP0423461A2 - Centrifugeuse décanteuse à bol plein - Google Patents

Centrifugeuse décanteuse à bol plein Download PDF

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Publication number
EP0423461A2
EP0423461A2 EP90116037A EP90116037A EP0423461A2 EP 0423461 A2 EP0423461 A2 EP 0423461A2 EP 90116037 A EP90116037 A EP 90116037A EP 90116037 A EP90116037 A EP 90116037A EP 0423461 A2 EP0423461 A2 EP 0423461A2
Authority
EP
European Patent Office
Prior art keywords
centrifuge
solid
drum
screw
discharge
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP90116037A
Other languages
German (de)
English (en)
Other versions
EP0423461A3 (en
EP0423461B1 (fr
Inventor
Reinhold Dr. Schilp
Wolfgang Epper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutz AG
Original Assignee
Kloeckner Humboldt Deutz AG
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
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Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Publication of EP0423461A2 publication Critical patent/EP0423461A2/fr
Publication of EP0423461A3 publication Critical patent/EP0423461A3/de
Application granted granted Critical
Publication of EP0423461B1 publication Critical patent/EP0423461B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw

Definitions

  • the invention relates to a solid-bowl screw centrifuge for the continuous separation of a solid-liquid mixture, consisting of an elongated centrifuge drum, which is rotatably mounted about its longitudinal axis and which surrounds a coaxially arranged screw conveyor rotating at a different speed, the screw spirals of which are attached to a screw drum , Means for feeding material to be separated into the drum along its axis and openings for the discharge of the separated light and heavy materials are provided.
  • a cylindrical solid-bowl screw centrifuge of the above type for separating suspensions which has a cutting disc with an annular gap between the cutting disc and centrifuge drum at the end of the separation space.
  • Clear phase channels are arranged radially on the screw body at a distance in front of the cutting disc and open into an axially arranged clear phase discharge line.
  • a radially extending sediment channel which opens into a sediment discharge line arranged coaxially with the clear phase discharge line.
  • a disadvantage of this known solid-bowl screw centrifuge is that, owing to the risk of clogging of the discharge channels, it can only be used for the separation of low-viscosity media, and that these media must not only be supplied to the centrifuge under excess pressure, but also that the centrifuge only under excess pressure can be operated.
  • the centrifuge must be provided with special seals, in particular mechanical seals, both in the feed area and in the discharge area of the separated media, which not only have to be replaced frequently due to the rapid wear, but which also have a relatively complicated design and are therefore very expensive to buy.
  • the object of the invention is to provide a solid-bowl screw centrifuge which, while avoiding the disadvantages mentioned above, is distinguished not only by its simple structural design, but which, even with high separation performance and very low energy consumption, continuously separates solid-liquid mixtures, in particular the drainage of thick sludge.
  • centrifuge according to the invention is therefore distinguished from known centrifuges of a similar design by its relatively simple construction and by its significantly lower energy consumption with high separation performance.
  • pump-like guide elements are arranged in the inlet region of the medium to be separated, and / or turbine-like guide elements are provided in the discharge area, at least for the lighter substances.
  • the arrangement of the pump-like guide elements in the inlet area very advantageously results in a particularly uniform distribution of the solid-liquid mixture in the separation space of the centrifuge, while the arrangement of the turbi NEN-like guide elements in the discharge area for the lighter substances enables a particularly energy-saving discharge of the lighter substances from the separation space of the centrifuge.
  • the solid-bowl screw centrifuge consists of a cylindrical solid-shell part (1), which is followed by a conical solid-shell part (2) tapering in the direction of the discharge of the heavy substances.
  • the cylindrical-conical drum casing (1, 2) is mounted in a housing (3) so that it can rotate.
  • a screw conveyor (4) with a screw drum (4 ') and a screw helix (5) arranged thereon is rotatably mounted in this cylindrical-conical solid jacket.
  • a feed tube (7) axially leading into the centrifuge drum (1, 2) is arranged on the right side.
  • the material inlet pipe (7) opens into a distribution chamber (8) arranged on the screw drum (4 '), to which a plurality of pump-like guide elements, which are arranged in the between the Screw drum (4 ') and the centrifuge drum (1, 2) located separation space (10) open.
  • Turbine-like guide elements in the form of flow channels (11) are provided on the conveyor screw (4) on the left-hand side Divert the liquid (arrow 13) separated from the solid (12) radially inwards laterally towards the liquid discharge (14).
  • discharge openings (15 ') are provided for the light substances, which according to the invention have a smaller radial distance (r1) from the centrifuge drum axis (a) than the greatest radial distance (r2 ) of the outer circumference of the screw drum (4 ') from the centrifuge drum axis (a), and which on the other hand have a greater radial distance (r1) from the centrifuge drum axis (a) than the outer circumference (r3) of the centrifuge drum shaft (16' ).
  • This embodiment of the solid-bowl screw centrifuge according to the invention not only very advantageously enables a completely pressure-free supply of the solid-liquid mixture into the separating space of the centrifuge and the discharge of the separated substances from the centrifuge without special mechanical seals, but it also makes a particularly large proportion of the kinetic Energy that is in the suspension in the centrifuge separation area can be recovered with high separation performance. It is also of not insignificant advantage that the radial distance (r4) of the discharge openings (15) for the heavy substances from the centrifuge drum axis (a) is less than the greatest radial distance (r2) of the outer jacket of the screw drum (4 ′) .
  • the screw conveyor (4) is driven at different speeds in relation to the centrifuge drum consisting of the solid-shell parts (1) and (2) and the solid-liquid mixture to be separated from the centrifuge is fed via the feed pipe (7). supplied from outside without pressure. Under the action of the centrifugal forces, the solids or thick matter is separated from the liquid in the separating space (10) of the centrifuge, the discharge for the heavy substances at the end of the centrifuge drum opposite the discharge for the light substances or the liquid (arrow 13) (1, 2).
  • the liquid separated from the solid (12) is diverted via the flow channels (11), which first run parallel to the screw shaft and then radially inwards, to the liquid discharge (14) and is discharged from the centrifuge drum, while the solids (12) are removed from the screw spiral (5). detected and transported inwards via the conical drum shell part (2) and discharged from the centrifuge drum via lateral openings (15).
  • the predominantly radial flow direction of the solid-liquid mixture is deflected very advantageously without energy loss into the axial flow direction, where it moves in spiral and / or axially directed paths over a large radius towards the discharge end of the centrifuge drum and under the influence of the Centrifugal force separates the heavy components (solids) from the lighter components (liquid).
  • the liquid separated from the solid is guided by the turbine or pump-like radial, oblique, straight or curved flow channels (11) practically without loss of energy to the smallest possible radius and passes next to the drive shaft (16) of the screw conveyor (4) through the openings (15 ') Depressurized from the centrifuge drum.
  • the solid (12) separated from the liquid is also conveyed to the smallest possible radius by means of the screw conveyor (4) via the conical jacket part (2) and discharged from the centrifuge drum with very little kinetic energy through the side openings (15).
  • the radial distance (r4) of the discharge openings (15) for the heavy substances from the centrifuge drum axis (a) is advantageously less than the largest radial distance (r2) of the outer shell of the screw drum (4 ').
  • additional other transport aids such as e.g. B. the pressure effect of the clear phase in connection with a baffle plate and negative pond height can be used.
  • the bearings (17) and (18) of the screw conveyor (4) are very advantageously arranged with a smaller radial distance from the drum axis (a) than the outlet openings (15, 15 ') for the solids (12) and the liquid ( 13), whereby the bearings (17, 18) are safely protected against splashing water and dirt.
  • the solid bowl screw centrifuge according to the invention can, as shown in FIG. 2, possibly also be carried out very advantageously as a direct current centrifuge.
  • channels (20, 22) are arranged on the outside of the hollow screw shaft (19), through which the liquid, which is conducted in direct current in the separation chamber (21) and is separated from the solid, is directed inwards and radially deflected via the flow channels (20, 22) into the liquid discharge (23) arrives and is discharged from there to the outside.
  • Turbine- or pump-like guide elements (24) according to the invention are also very advantageously arranged on the hollow screw shaft (19) in the feed inlet area, which guide elements convey the solid liquid radially emerging from the feed pipe (25) deflected in an axial flow in the separation chamber (21) of the centrifuge without loss of energy.
  • the solid bowl screw centrifuge according to the invention can also very advantageously be designed as a cocurrent and countercurrent centrifuge.
  • the centrifuge drum (26) and screw conveyor (27) are cylindrical in shape and the solids discharge (28) is very advantageously carried out in the center of the centrifuge drum (26).
  • turbine or pump-like guide elements (31, 32) are arranged on the screw conveyor (27) in the feed inlet area (29) and in the liquid discharge area (30) according to the invention, which guide the solid-liquid mixture radially emerging from the feed pipe into a separating space the centrifuge deflect the axial flow and the liquid separated from the solid in the discharge area radially inwards laterally towards the liquid discharge.
  • the arrangement according to the invention of turbine or pump-like guide elements on the screw conveyor achieves the same advantages as in the solid-bowl screw centrifuges shown in FIGS. 1 and 2.
  • the turbine or pump-like guide elements (31, 32) which also consist of several flow channels, can very advantageously run radially or at an oblique angle, straight or also curved, in particular also spiral extending, arranged or formed so that they act like a pump or turbine impeller during operation of the centrifuge.
  • the cross-section of the flow channels can also be very advantageously round or angular, depending on requirements and depending on the solid-liquid mixture to be separated, in order thereby to ensure as smooth a operation as possible.
  • the guide elements acting like a pump wheel can be arranged on the centrifuge drum with the same advantages instead of on the screw conveyor.
  • it is also very easy to provide separate discharges for more than two substances separated from one another in the centrifuge on the centrifuge drum. It is important here that the component in the centrifuge which is separated in terms of volume and is carried as far inward as possible and discharged from there without pressure in order to be able to operate the centrifuge according to the invention with significantly lower energy and cost expenditure than previously known centrifuges.
  • m is the throughput (t / h).
  • D the diameter of the centrifuge drum (m).
  • n the drum revolution per minute (rpm) ⁇ the efficiency of the centrifuge.
  • This calculation is based on an efficiency ⁇ of 0.80 and reduced inlet and spray radii of about 1/3 x drum inside diameter D.
  • the centrifuge according to the invention is not only characterized by its simple and reliable machine structure and the ge wrestle fraction and the very low product damage or flake and cell destruction, but also by their insensitivity to coarse materials or individual heavy particles in the feed.
  • the centrifuge designed according to the invention eliminates both mechanical seals for the worm bearings and hollow shaft gears for the worm drive, as a result of which a particularly strong reduction in investment and operating costs is achieved.
  • the noise level, ie the noise level of the centrifuge according to the invention is also considerably lower compared to known centrifuges and the throughput and separation performance are significantly higher.

Landscapes

  • Centrifugal Separators (AREA)
EP90116037A 1989-10-17 1990-08-22 Centrifugeuse décanteuse à bol plein Expired - Lifetime EP0423461B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3934612 1989-10-17
DE3934612 1989-10-17
DE4005755 1990-02-23
DE4005755A DE4005755A1 (de) 1989-10-17 1990-02-23 Vollmantel-schneckenzentrifuge

Publications (3)

Publication Number Publication Date
EP0423461A2 true EP0423461A2 (fr) 1991-04-24
EP0423461A3 EP0423461A3 (en) 1991-07-24
EP0423461B1 EP0423461B1 (fr) 1994-07-20

Family

ID=25886188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116037A Expired - Lifetime EP0423461B1 (fr) 1989-10-17 1990-08-22 Centrifugeuse décanteuse à bol plein

Country Status (4)

Country Link
US (1) US5545119A (fr)
EP (1) EP0423461B1 (fr)
DE (2) DE4005755A1 (fr)
DK (1) DK0423461T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2130607A1 (fr) * 2008-06-06 2009-12-09 Mantovani & Vicentini S.r.L. Séparateur par centrifugation

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4231063A1 (de) * 1992-09-17 1994-03-24 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge zum Klären oder Trennen eines Flüssigkeits-Feststoffgemisches
GB9611209D0 (en) * 1996-05-29 1996-07-31 Ecc Int Ltd Decanter centrifuge
US6290636B1 (en) * 2000-04-28 2001-09-18 Georg Hiller, Jr. Helix centrifuge with removable heavy phase discharge nozzles
US6790169B2 (en) * 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US7018326B2 (en) * 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US6780147B2 (en) * 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US6605029B1 (en) * 2000-08-31 2003-08-12 Tuboscope I/P, Inc. Centrifuge with open conveyor and methods of use
CN103586141B (zh) * 2012-08-15 2016-09-28 钦州鑫能源科技有限公司 离心分离装置
DE102018113135A1 (de) * 2018-06-01 2019-12-05 Bernhard Giersberg Vorrichtung zur Klärschlammentwässerung

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GB364348A (en) * 1931-01-12 1932-01-07 Broadbent & Sons Ltd Thomas Improvements in or relating to centrifugal separators
BE422606A (fr) * 1936-08-13
US2435623A (en) * 1942-03-11 1948-02-10 Separator Nobel Ab Centrifuges for separating from a liquid matters suspended or emulgated therein
DE904999C (de) * 1950-08-05 1954-02-25 Krauss Maffei Ag Kontinuierlich arbeitende Schleudermaschine
BE638716A (fr) * 1962-10-16
FR1387605A (fr) * 1963-03-27 1965-01-29 Kloeckner Humboldt Deutz Ag Centrifugeuse à paroi pleine pour la séparation de mélanges solides-liquide
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US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
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DE2057555C3 (de) * 1970-11-23 1975-06-05 Werner 8000 Muenchen Busch Schneckenzentrifuge
DE2154563A1 (de) * 1971-11-03 1973-05-10 Georg Hiller Vollmantelschneckenzentrifuge
DE2907318A1 (de) * 1979-02-24 1980-08-28 Bayer Ag Vollmantelschneckenzentrifuge mit angepasster schneckenwendel
US4334647A (en) * 1980-12-03 1982-06-15 Bird Machine Company, Inc. Centrifuges
US4743226A (en) * 1983-04-29 1988-05-10 Geosource Inc. High capacity continuous solid bowl centrifuge
DE3318064A1 (de) * 1983-05-18 1984-11-22 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und vorrichtung zur trennung eines feststoff-fluessigkeitsgemisches
DE3326310C2 (de) * 1983-07-21 1986-02-20 Westfalia Separator Ag, 4740 Oelde Vollmantelzentrifuge mit einer Förderschnecke
US4566873A (en) * 1984-03-28 1986-01-28 Kotobuki Engineering & Manufacturing Co., Ltd. Screw decanter type centrifugal concentrating machine
DE3518885A1 (de) * 1985-05-25 1986-11-27 Bayer Ag, 5090 Leverkusen Vollmantelschneckenzentrifuge mit nachklaervorrichtung
DE3608664A1 (de) * 1986-03-14 1987-09-17 Krauss Maffei Ag Vollmantelzentrifuge
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DE3904151A1 (de) * 1989-02-11 1990-08-16 Heckmann Wolfgang Zentrifuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2130607A1 (fr) * 2008-06-06 2009-12-09 Mantovani & Vicentini S.r.L. Séparateur par centrifugation

Also Published As

Publication number Publication date
EP0423461A3 (en) 1991-07-24
DE4005755A1 (de) 1991-04-18
DK0423461T3 (da) 1994-08-22
EP0423461B1 (fr) 1994-07-20
US5545119A (en) 1996-08-13
DE59006496D1 (de) 1994-08-25

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