EP0806245A1 - Centrifugeuse à vis avec une vanne actionnée par la force centrifuge - Google Patents

Centrifugeuse à vis avec une vanne actionnée par la force centrifuge Download PDF

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Publication number
EP0806245A1
EP0806245A1 EP97106703A EP97106703A EP0806245A1 EP 0806245 A1 EP0806245 A1 EP 0806245A1 EP 97106703 A EP97106703 A EP 97106703A EP 97106703 A EP97106703 A EP 97106703A EP 0806245 A1 EP0806245 A1 EP 0806245A1
Authority
EP
European Patent Office
Prior art keywords
drum
centrifuge
centrifugal
liquid
end wall
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
EP97106703A
Other languages
German (de)
English (en)
Other versions
EP0806245B1 (fr
Inventor
Bernward Feldkamp
Reinhold Boden
Brigitta Steden
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.)
Baker Hughes Deutschland GmbH
Original Assignee
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
Application filed by Deutz AG filed Critical Deutz AG
Publication of EP0806245A1 publication Critical patent/EP0806245A1/fr
Application granted granted Critical
Publication of EP0806245B1 publication Critical patent/EP0806245B1/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
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • 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
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the invention relates to a centrifuge, in particular a screw centrifuge for separating solid-liquid mixtures with a rotatably mounted drum casing and a screw conveyor rotatable therein with a different speed, and with liquid discharge openings arranged in the end wall of the centrifuge drum and with solids discharge openings at the other end of the centrifuge drum.
  • Solid-bowl screw centrifuges have a device for the central feeding of the solid-liquid mixture to be separated into the centrifuge drum as well as outlet openings for the discharge of the separated light and heavy substances.
  • a plurality of liquid discharge openings distributed around the circumference are arranged in the end wall of the centrifuge drum, and the other, usually conically tapered drum end also has discharge openings distributed around the circumference through which the discharge screw feeds solid transported within the drum and largely freed from the liquid is discharged.
  • a liquid ring is formed during the operation of such a screw centrifuge within the centrifuge drum, the inside diameter of which is determined by the radial arrangement of the liquid discharge openings, which are evenly distributed around the circumference of the drum end wall, or by the height of radially adjustable weir washers is determined by their Adjustment of the liquid level or the pond depth can be changed.
  • a speed is then reached when the centrifuge drum runs out, at which the centrifugal force becomes lower than the gravitational force with the result that the liquid ring forming in the centrifuge drum collapses and the filling level of the liquid inside the centrifuge drum extends beyond the solids discharge openings, so that at these openings, even if only briefly, liquid is discharged in an undesirable manner in gushing manner.
  • the invention is therefore based on the object to avoid these disadvantages and to provide a screw centrifuge, in the start-up and shutdown process of which there are no longer problems which result from the amount of liquid present or remaining in the centrifuge drum, in particular the problem of the escape of liquid to the Solids discharge openings during the shutdown process.
  • the invention is based on the idea of making the liquid ring in the centrifuge described above or remaining in the centrifuge, which leads to problems during the start-up and shutdown process of the centrifuge, to disappear in the start-up and shutdown phase.
  • at least one drum emptying opening is arranged radially outside the liquid drain openings in the drum end wall, preferably several drum emptying openings are arranged radially outside of the liquid drain openings in order to completely empty the remaining centrifuge liquid from the remaining centrifuge can.
  • centrifugal valve of the screw centrifuge according to the invention thus acts in exactly the opposite way to e.g. B. with plate separators used return valves that open the discharge openings for the heavy phase at high speed of the separator due to high centrifugal force and product load, while exactly the opposite, closes the integrated centrifugal valve in the screw centrifuge according to the invention with occurring high centrifugal force.
  • the closure body of the centrifugal valve can consist of a piston slide, which can be inserted into and into a radially inside the drum emptying opening on the blind bore which is located in the drum end wall this can be moved back and forth like a piston under the influence of the force of a spring and the centrifugal force built up in the centrifuge mode and thereby releases or closes the crossing drum emptying opening.
  • the spring is preferably a biased compression spring arranged in the drum end wall radially outside the drum emptying opening, e.g. B.
  • the clamping force which builds up the counterforce to the centrifugal centrifugal force, is matched to the opening speed at which the valve spool is moved radially inward and thereby releases the respective piston emptying opening when the centrifuge is being shut down.
  • the drum emptying openings are kept open under the action of the spring-loaded centrifugal valve body until a certain operating speed is reached, so that the start-up of the screw centrifuge or the acceleration of the rotor is not impeded by a remaining amount of liquid remaining in the drum.
  • the screw centrifuge according to the invention has a drum casing 10 with a screw conveyor coaxially arranged therein with screw spirals 11, which rotates in the same direction of rotation as the centrifuge drum 10, but at a different speed.
  • the solid-liquid mixture to be dewatered such.
  • B. the sewage sludge is introduced into the centrifuge drum via the central feed tube 12.
  • a liquid ring forms under the influence of the centrifugal force inside the centrifuge drum 10, from which the heavy substances are transported to the right with the aid of the screw conveyor 11 and conveyed via the mostly conical drum end to the solid discharge openings (not shown in FIG.
  • the closure body of the centrifugal valve 18 consists of a piston slide 19 which, after the position in FIG. 2, is struck at its bottom dead center and according to FIG. 3 at its top dead center.
  • the piston slide 19 can be inserted into a blind bore 17 which is located radially inside the drum emptying opening 16 and in this in the drum end wall and in this under the action of the force of a spring 20 and that in centrifugal operation the centrifugal force built up can be moved back and forth like a piston, whereby it clears the crossing drum emptying opening 16 according to FIG. 3 or closes it according to FIG. 2.
  • the spring 20 is a prestressed compression spring arranged in the drum end wall 14 radially outside the drum emptying opening 16, the tension force of which builds up the counterforce to the centrifugal centrifugal force is matched to that Opening speed at which the valve spool 19 is moved radially inwards and thereby releases the drum emptying opening 16 when the centrifuge is being moved down. That is, when the screw centrifuge is switched off, the speed of the centrifuge drum 10 decreases to a standstill and thus the centrifugal force also decreases.
  • FIG. 3 shows this open position of the centrifugal force valves 18 arranged according to the invention.
  • the piston slides 19 only move radially outwards from a certain drum speed and only then close the drum emptying openings 16 when the centrifuge is restarted.
  • valve spring 20 engaging on the piston rod 21 of the piston slide 19 is supported with its radially outer end in a cap-shaped locking screw 22 which is in the end face of the drum end wall 14 from Circumference radially to the centrifuge axis is screwed.
  • the radially outer head of this cap-shaped locking screw advantageously has a through hole 23 for liquid drain and for self-cleaning of the centrifugal valve with self-cleaning of the turns of the helical spring 20.
  • the piston valve 19 of the centrifugal valve 18 has a secure stop both at bottom dead center (FIG. 2) and at top dead center (FIG. 3), so that a stable valve position is established both in the closed state and in the open state of the valve .
  • the part of the sliding body 19, which is cylindrical in the exemplary embodiment is pressed against the guide surface by the pressure prevailing in the centrifuge drum 10, so that the remaining gap 24 between the piston slide 19 and the wall of the blind bore 17 is practically reduced to zero, as can be clearly seen in FIG. 4 leaves.

Landscapes

  • Centrifugal Separators (AREA)
EP97106703A 1996-05-07 1997-04-23 Centrifugeuse à vis avec une vanne actionnée par la force centrifuge Expired - Lifetime EP0806245B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19618249A DE19618249A1 (de) 1996-05-07 1996-05-07 Schneckenzentrifuge mit Fliehkraft-Ventil
DE19618249 1996-05-07

Publications (2)

Publication Number Publication Date
EP0806245A1 true EP0806245A1 (fr) 1997-11-12
EP0806245B1 EP0806245B1 (fr) 2001-06-06

Family

ID=7793552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106703A Expired - Lifetime EP0806245B1 (fr) 1996-05-07 1997-04-23 Centrifugeuse à vis avec une vanne actionnée par la force centrifuge

Country Status (6)

Country Link
US (1) US5913767A (fr)
EP (1) EP0806245B1 (fr)
JP (1) JPH11581A (fr)
AT (1) ATE201834T1 (fr)
DE (2) DE19618249A1 (fr)
DK (1) DK0806245T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002051550A1 (fr) * 2000-12-27 2002-07-04 Westfalia Separator Industry Gmbh Centrifugeuse a vis, a bol plein, a assiettes
US7060019B2 (en) 2000-11-14 2006-06-13 Westfalia Separator Ag Solid bowl screw centrifuge comprising a distributor

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650061A (en) * 1982-07-14 1987-03-17 Weyerhaeuser Company Crowding lug transfer conveyor system
DE10021983A1 (de) * 2000-05-05 2001-11-08 Baker Hughes De Gmbh Vollmantelzentrifuge zur Trennung von Feststoff-Flüssigkeitsgemischen
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
DE10203652B4 (de) * 2002-01-30 2006-10-19 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge mit einem Wehr
US20050242003A1 (en) 2004-04-29 2005-11-03 Eric Scott Automatic vibratory separator
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US8312995B2 (en) 2002-11-06 2012-11-20 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US20060105896A1 (en) * 2004-04-29 2006-05-18 Smith George E Controlled centrifuge systems
US7540838B2 (en) * 2005-10-18 2009-06-02 Varco I/P, Inc. Centrifuge control in response to viscosity and density parameters of drilling fluid
US7540837B2 (en) * 2005-10-18 2009-06-02 Varco I/P, Inc. Systems for centrifuge control in response to viscosity and density parameters of drilling fluids
US20080083566A1 (en) 2006-10-04 2008-04-10 George Alexander Burnett Reclamation of components of wellbore cuttings material
US8622220B2 (en) 2007-08-31 2014-01-07 Varco I/P Vibratory separators and screens
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US8556083B2 (en) 2008-10-10 2013-10-15 National Oilwell Varco L.P. Shale shakers with selective series/parallel flow path conversion
SE534386C2 (sv) 2009-10-29 2011-08-02 Alfa Laval Corp Ab Centrifugalseparator samt metod för separering av fasta partiklar
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen
DE102014101205B4 (de) * 2014-01-31 2021-08-05 Flottweg Se Auslassvorrichtung einer Vollmantelschneckenzentrifuge
DE202022100680U1 (de) 2022-02-07 2023-05-11 Gea Westfalia Separator Group Gmbh Separator
CN116459955A (zh) * 2023-06-02 2023-07-21 江苏华大离心机制造有限公司 离心分离转鼓及离心分离设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB297914A (en) * 1927-07-26 1928-10-04 Sunderland Forge & Engineering Improvements in and relating to centrifugal separators
US2022815A (en) * 1933-09-27 1935-12-03 Laval Separator Co De Centrifugal bowl for separating heavy sludge and solids from lighter liquids
DE2409917A1 (de) * 1973-03-22 1974-09-26 Alfa Laval Ab Schlammzentrifuge
DE4130759A1 (de) * 1991-09-16 1993-03-18 Flottweg Gmbh Zentrifuge zur kontinuierlichen trennung von stoffen unterschiedlicher dichte

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB574667A (en) * 1943-07-13 1946-01-15 Separator Ab A centrifugal bowl for separating sludge-containing liquids
GB1066541A (en) * 1962-12-19 1967-04-26 English Electric Co Ltd Apparatus for supplying electric current from an a.c. supply to a load at a low frequency
AT381718B (de) * 1982-01-20 1986-11-25 Voest Alpine Ag Rotierendes spaltsieb zum trocknen von feststoffen, z.b. braunkohlen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB297914A (en) * 1927-07-26 1928-10-04 Sunderland Forge & Engineering Improvements in and relating to centrifugal separators
US2022815A (en) * 1933-09-27 1935-12-03 Laval Separator Co De Centrifugal bowl for separating heavy sludge and solids from lighter liquids
DE2409917A1 (de) * 1973-03-22 1974-09-26 Alfa Laval Ab Schlammzentrifuge
DE4130759A1 (de) * 1991-09-16 1993-03-18 Flottweg Gmbh Zentrifuge zur kontinuierlichen trennung von stoffen unterschiedlicher dichte

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7060019B2 (en) 2000-11-14 2006-06-13 Westfalia Separator Ag Solid bowl screw centrifuge comprising a distributor
WO2002051550A1 (fr) * 2000-12-27 2002-07-04 Westfalia Separator Industry Gmbh Centrifugeuse a vis, a bol plein, a assiettes
US7083565B2 (en) 2000-12-27 2006-08-01 Westfalia Separator Ag Solid-bowl centrifuge having a disk stack on the drum cover

Also Published As

Publication number Publication date
DE59703712D1 (de) 2001-07-12
DK0806245T3 (da) 2001-09-17
EP0806245B1 (fr) 2001-06-06
JPH11581A (ja) 1999-01-06
DE19618249A1 (de) 1997-11-13
US5913767A (en) 1999-06-22
ATE201834T1 (de) 2001-06-15

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