US3447742A - Sludge-separating centrifuge - Google Patents

Sludge-separating centrifuge Download PDF

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Publication number
US3447742A
US3447742A US588522A US3447742DA US3447742A US 3447742 A US3447742 A US 3447742A US 588522 A US588522 A US 588522A US 3447742D A US3447742D A US 3447742DA US 3447742 A US3447742 A US 3447742A
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Prior art keywords
sludge
rotor
outlet
screw conveyor
disc
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Expired - Lifetime
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US588522A
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John Thorbjorn Eriksson
Birger Torsten Arne Moller
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Alfa Laval AB
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Alfa Laval AB
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    • 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
    • B04B2001/2041—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 baffles, plates, vanes or discs attached to the conveying screw
    • 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 centrifugal rotor has an outlet for separated sludge and a separate level-maintaining outlet for separated liquid, the mixture of liquid and sludge being fed into the rotor from the discharge opening of a supply pipe.
  • a screw conveyor has a shaft mounted for rotation in the rotor and is operable to convey centrifugally separated sludge to the sludge outlet; and a circular disc is fixed to this shaft at an axial location between the discharge opening of the supply pipe and the sludge outlet, the disc being coaxial with the screw conveyor and having its periphery lying radially outside the level-maintaining outlet.
  • a second circular disc is fixed to the shaft at an axial location between the discharge opening of the supply pipe and the level-maintaining outlet, the second disc also being coaxial with the screw conveyor and having its periphery lying radially outside the level-maintaining outlet but radially inside the periphery of the first disc.
  • the present invention relates to sludge-separating centrifuges of the type having a screw conveyor by which centrifugally separated sludge is discharged at one end of the rotor, a level-maintaining outlet at the other end of the rotor for the discharge of separated liquid, a circular disc in the rotor fixed to the shaft of the screw conveyor and coaxial with the screw conveyor, the periphery of this disc lying radially outside the level-maintaining outlet, and a supply pipe extending into the rotor.
  • this fat content can be avoided by providing a disc similar to that previously mentioned but located axially beyond the opening of the supply pipe, reckoned from the level-maintaining outlet.
  • the disc so located constitutes a barrier for the fat layer, which is formed by the centrifuging as the radially innermost layer, so that the sludge which the screw conveyor removes from the water layer cannot come into contact with the fat. In this way, the sludge discharged from the centrifuge will be free from fat.
  • a centrifuge rotor 1 has a conical part 13 and is provided at its opposite ends with trunnions 11 and 11a which, by bearings and 10a, are rotatably journalled in a stationary housing 12.
  • a screw conveyor 2 Inside the rotor is a screw conveyor 2 arranged to rotate about the same axis as the rotor but driven by shaft 2a at a speed of rotation somewhat different from that of the rotor.
  • the screw conveyor serves to feed centrifugally separated sludge along the conical wall 13 of the rotor to a sludge outlet 14 through which the sludge is discharged under centrifugal force.
  • an overflow outlet 5 In the larger end wall 8 of the rotor is an overflow outlet 5.
  • a stationary supply pipe 6 for the material to be treated extends into the rotor.
  • This pipe is coaxial with the rotor and passes through the hollow trunnion 11a.
  • Rotor 1 is driven in any suitable manner, as through gearing (not shown) connected to trunnion 11.
  • the material fed from supply pipe 6 forms an annulus 15 at the inside of the rotor, due to the action of centrifugal force.
  • the centrifugal force divides this annulus into annular layers, due to the different specific gravities of the components of the feed mixture. For example, if a mixture of water, oil and sludge is to be separated, the mixture is divided centrifugally into an oil layer located nearest the rotation axis, then a water layer, and then a sludge layer located farthest from the rotor axis.
  • a circular disc 4 is fixed to the shaft 3 of the screw conveyor 2 and is coaxial with the screw conveyor, the periphery of this disc lying radially outside the overflow outlet 5.
  • Disc 4 is located axially beyond the opening 7 of the supply pipe 6, reckoned from the outlet 5, and forms a dam which prevents the separated oil layer from flowing in the direction toward the sludge outlet 14. Consequently, when the sludge phase is fed radially inward through the liquid phase by the screw conveyor, the sludge will not pass through any oil layer but only through a water layer. The sludge will thus be completely free from oil.
  • the location where the circular disc 4 is fixed to the screw conveyor shaft 3 will be seen from the drawing.
  • a circular disc 4a is fixed to the screw conveyor shaft 3 at an axial location between the opening 7 of the supply pipe 6 and the level-maintaining outlet 5. The periphery of the disc 4a lies radially outside the level-maintaining outlet 5 and prevents the floating fat lumps from reaching that outlet.
  • the diameter of the discs is chosen so that the disc 4 extends radially through at least the whole thickness of the oil layer, whereas the disc 4a mainly breaks only the surface of the oil layer.
  • a centrifugal rotor In a sludge-separating centrifuge, the combination of a centrifugal rotor, a supply pipe extending into the rotor and having an opening for discharging a mixture of liquid and sludge into the rotor, the rotor having an outlet for centrifugally separated sludge and a separate level-maintaining outlet for centrifugally separated liquid, a screw conveyor in the rotor operable to convey centrifugally separated sludge to said sludge outlet, said conveyor having a shaft mounted for rotation in the rotor, a circular disc fixed to said shaft at an axial location between said discharge opening of the supply pipe and said sludge outlet, said disc being coaxial with the rotation axis of the screw conveyor and having its periphery lying radially outside said level-maintaining outlet, and a second circular disc fixed to said shaft at an axial location between said discharge opening of the supply pipe and said level-maintaining outlet, the second

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  • Centrifugal Separators (AREA)

Description

June 3, 1969 J sso ET AL 3,447,742
SLUDGE-SEPARAT ING CENTRIFUGE Filed Oct. 21, 1966 Ell-gel- Ensen Arne Nil/sf Y United States Patent US. Cl. 233-7 1 Claim ABSTRACT OF THE DISCLOSURE The centrifugal rotor has an outlet for separated sludge and a separate level-maintaining outlet for separated liquid, the mixture of liquid and sludge being fed into the rotor from the discharge opening of a supply pipe. A screw conveyor has a shaft mounted for rotation in the rotor and is operable to convey centrifugally separated sludge to the sludge outlet; and a circular disc is fixed to this shaft at an axial location between the discharge opening of the supply pipe and the sludge outlet, the disc being coaxial with the screw conveyor and having its periphery lying radially outside the level-maintaining outlet. A second circular disc is fixed to the shaft at an axial location between the discharge opening of the supply pipe and the level-maintaining outlet, the second disc also being coaxial with the screw conveyor and having its periphery lying radially outside the level-maintaining outlet but radially inside the periphery of the first disc.
The present invention relates to sludge-separating centrifuges of the type having a screw conveyor by which centrifugally separated sludge is discharged at one end of the rotor, a level-maintaining outlet at the other end of the rotor for the discharge of separated liquid, a circular disc in the rotor fixed to the shaft of the screw conveyor and coaxial with the screw conveyor, the periphery of this disc lying radially outside the level-maintaining outlet, and a supply pipe extending into the rotor.
When separating a liquid containing fat and water in centrifuges of this kind, it has been found that sludge discharged from the centrifuge has a certain fat content. According to the present invention, this fat content can be avoided by providing a disc similar to that previously mentioned but located axially beyond the opening of the supply pipe, reckoned from the level-maintaining outlet. The disc so located constitutes a barrier for the fat layer, which is formed by the centrifuging as the radially innermost layer, so that the sludge which the screw conveyor removes from the water layer cannot come into contact with the fat. In this way, the sludge discharged from the centrifuge will be free from fat.
The invention is described more in detail below in ref erence to the accompanying drawing, in which the single illustration is a vertical sectional view of an embodiment of the new centrifuge.
In the drawing, a centrifuge rotor 1 has a conical part 13 and is provided at its opposite ends with trunnions 11 and 11a which, by bearings and 10a, are rotatably journalled in a stationary housing 12. Inside the rotor is a screw conveyor 2 arranged to rotate about the same axis as the rotor but driven by shaft 2a at a speed of rotation somewhat different from that of the rotor. The screw conveyor serves to feed centrifugally separated sludge along the conical wall 13 of the rotor to a sludge outlet 14 through which the sludge is discharged under centrifugal force. In the larger end wall 8 of the rotor is an overflow outlet 5. A stationary supply pipe 6 for the material to be treated extends into the rotor. This pipe is coaxial with the rotor and passes through the hollow trunnion 11a. Rotor 1 is driven in any suitable manner, as through gearing (not shown) connected to trunnion 11.
When a centrifuge of the type initially described is in operation, the material fed from supply pipe 6 forms an annulus 15 at the inside of the rotor, due to the action of centrifugal force. The centrifugal force divides this annulus into annular layers, due to the different specific gravities of the components of the feed mixture. For example, if a mixture of water, oil and sludge is to be separated, the mixture is divided centrifugally into an oil layer located nearest the rotation axis, then a water layer, and then a sludge layer located farthest from the rotor axis. As screw conveyor 2 feeds the sludge along the inside of the rotor wall towards its outlet 14, the sludge will thus pass through the oil layer lying nearest the rotor axis and contacting the conical wall 13 of the rotor. It is obvious that the sludge will then entrain a substantial quantity of oil, which is lost.
According to the present invention, a circular disc 4 is fixed to the shaft 3 of the screw conveyor 2 and is coaxial with the screw conveyor, the periphery of this disc lying radially outside the overflow outlet 5. Disc 4 is located axially beyond the opening 7 of the supply pipe 6, reckoned from the outlet 5, and forms a dam which prevents the separated oil layer from flowing in the direction toward the sludge outlet 14. Consequently, when the sludge phase is fed radially inward through the liquid phase by the screw conveyor, the sludge will not pass through any oil layer but only through a water layer. The sludge will thus be completely free from oil. The location where the circular disc 4 is fixed to the screw conveyor shaft 3 will be seen from the drawing.
It may happen that solid fat lumps are contained in the material which is fed to the centrifuge through the supply pipe 6. These fat lumps often contain substantial quantities of sludge particles. Normally, these lumps will float on the annular liquid surface and discharge through the outlet 5, whereby the separated fat phase will contain contaminating sludge. In order to prevent this, a circular disc 4a is fixed to the screw conveyor shaft 3 at an axial location between the opening 7 of the supply pipe 6 and the level-maintaining outlet 5. The periphery of the disc 4a lies radially outside the level-maintaining outlet 5 and prevents the floating fat lumps from reaching that outlet. After some time they melt, whereupon the released sludge is centrifugally separated and joins the sludge conveyed to the sludge outlet 14. Obviously, the diameter of the discs is chosen so that the disc 4 extends radially through at least the whole thickness of the oil layer, whereas the disc 4a mainly breaks only the surface of the oil layer.
We claim:
1. In a sludge-separating centrifuge, the combination of a centrifugal rotor, a supply pipe extending into the rotor and having an opening for discharging a mixture of liquid and sludge into the rotor, the rotor having an outlet for centrifugally separated sludge and a separate level-maintaining outlet for centrifugally separated liquid, a screw conveyor in the rotor operable to convey centrifugally separated sludge to said sludge outlet, said conveyor having a shaft mounted for rotation in the rotor, a circular disc fixed to said shaft at an axial location between said discharge opening of the supply pipe and said sludge outlet, said disc being coaxial with the rotation axis of the screw conveyor and having its periphery lying radially outside said level-maintaining outlet, and a second circular disc fixed to said shaft at an axial location between said discharge opening of the supply pipe and said level-maintaining outlet, the second disc also being coaxial with the rotation axis of the screw conveyor and having its periphery lying radially outside said 4 level-maintain ing outlet but radially inside said periphery FOREIGN PATENTS 0f the 1,753,992 10/1957 Germany.
References 364,348 1/1932 Great Britain.
UNITED STATES PATENTS 3,228,594 1/1966 Amero 2337 0 r HENRY T. KLINKSIEK, Primary Examiner.
US588522A 1965-10-21 1966-10-21 Sludge-separating centrifuge Expired - Lifetime US3447742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1363265 1965-10-21

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DE (1) DE1532678A1 (en)
DK (1) DK124061B (en)
IS (1) IS679B6 (en)
NO (1) NO120465B (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534902A (en) * 1969-02-07 1970-10-20 Lafayette E Gilreath Combined centrifugal and magnetic separator mechanism
US3620442A (en) * 1969-03-17 1971-11-16 Combustion Eng Centrifuge slurry supply
US3727831A (en) * 1970-08-31 1973-04-17 Georgia Kaolin Co Method and apparatus for classifying fine particle materials
US3795361A (en) * 1972-09-06 1974-03-05 Pennwalt Corp Centrifuge apparatus
US4209128A (en) * 1979-04-06 1980-06-24 Yara Engineering Corporation Methods and apparatus for classifying fine particle solids
FR2460717A1 (en) * 1979-07-05 1981-01-30 Hide Katsume SCREW CENTRIFUGAL APPARATUS COMPRISING A BOWL WITH FULL WALLS
US5306225A (en) * 1990-11-27 1994-04-26 Tsukishima Kikai Co., Ltd. Decanter centrifuge having a disc-like dip weir with a hole
WO1996006046A1 (en) * 1994-08-19 1996-02-29 Durchschlag & Bever Ingenieurgesellschaft Für Siedlungswasserwirtschaft Mbh Sewage clarification plant
US5509882A (en) * 1994-09-12 1996-04-23 Tetra Laval Holdings & Finance S.A. Decanter centrifuge having an offset conveyor flight to aid rinsing
US5653673A (en) * 1994-06-27 1997-08-05 Amoco Corporation Wash conduit configuration in a centrifuge apparatus and uses thereof
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
WO2001032314A1 (en) * 1999-11-02 2001-05-10 Westfalia Separator Industry Gmbh Screw-type solid bowl centrifuge
US6561965B1 (en) 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
US20050143245A1 (en) * 2002-05-08 2005-06-30 Werner Kohlstette Centrifuge especially a separator
US20050202950A1 (en) * 2002-04-22 2005-09-15 Klaus Dircks Decanter centrifuge
US20050227848A1 (en) * 2002-05-29 2005-10-13 Wilhelm Ostkamp Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof
US20070049480A1 (en) * 2003-06-18 2007-03-01 Alfa Laval Corporate Ab Screw conveyor for a decanter centrifuge
US20070125704A1 (en) * 2001-12-07 2007-06-07 Ngk Insulators, Ltd. Ceramic filter and method for purifying water
US20080153687A1 (en) * 2003-08-08 2008-06-26 Michael Reichenbach Solid Bowl Screw Centrifuge Comprising a Centripetal Pump
WO2010037101A1 (en) 2008-09-29 2010-04-01 Investigacion De Tecnologia Avanzada, S.A. De C.V. Method for the production of whole nixtamalized corn flour
CN101905193A (en) * 2010-07-12 2010-12-08 巨能机械(中国)有限公司 Rotary drum of horizontal spiral discharge sedimentation centrifuge
US7908764B1 (en) 2008-05-05 2011-03-22 Decanter Machines, Inc. Hyperbaric centrifuge system
CN107206396A (en) * 2015-01-30 2017-09-26 安德里茨有限公司 Entity solid bowl centrifuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2813140A1 (en) * 1978-03-25 1979-10-25 Kloeckner Humboldt Deutz Ag FULL CASE SCREW CENTRIFUGE
DE4234636C2 (en) * 1992-10-14 2002-11-07 Baker Hughes De Gmbh Device and method for the wet mechanical separation / sorting of plastic mixtures

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364348A (en) * 1931-01-12 1932-01-07 Broadbent & Sons Ltd Thomas Improvements in or relating to centrifugal separators
US3228594A (en) * 1965-02-05 1966-01-11 Clifford L Amero Centrifugal separator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB364348A (en) * 1931-01-12 1932-01-07 Broadbent & Sons Ltd Thomas Improvements in or relating to centrifugal separators
US3228594A (en) * 1965-02-05 1966-01-11 Clifford L Amero Centrifugal separator

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534902A (en) * 1969-02-07 1970-10-20 Lafayette E Gilreath Combined centrifugal and magnetic separator mechanism
US3620442A (en) * 1969-03-17 1971-11-16 Combustion Eng Centrifuge slurry supply
US3727831A (en) * 1970-08-31 1973-04-17 Georgia Kaolin Co Method and apparatus for classifying fine particle materials
US3795361A (en) * 1972-09-06 1974-03-05 Pennwalt Corp Centrifuge apparatus
DE2344507A1 (en) * 1972-09-06 1974-03-14 Pennwalt Corp DECANTING CENTRIFUGE
JPS4986951A (en) * 1972-09-06 1974-08-20
US3885734A (en) * 1972-09-06 1975-05-27 Pennwalt Corp Centrifuge apparatus
JPS5313058B2 (en) * 1972-09-06 1978-05-08
US4209128A (en) * 1979-04-06 1980-06-24 Yara Engineering Corporation Methods and apparatus for classifying fine particle solids
FR2460717A1 (en) * 1979-07-05 1981-01-30 Hide Katsume SCREW CENTRIFUGAL APPARATUS COMPRISING A BOWL WITH FULL WALLS
US5306225A (en) * 1990-11-27 1994-04-26 Tsukishima Kikai Co., Ltd. Decanter centrifuge having a disc-like dip weir with a hole
US5653673A (en) * 1994-06-27 1997-08-05 Amoco Corporation Wash conduit configuration in a centrifuge apparatus and uses thereof
WO1996006046A1 (en) * 1994-08-19 1996-02-29 Durchschlag & Bever Ingenieurgesellschaft Für Siedlungswasserwirtschaft Mbh Sewage clarification plant
US5509882A (en) * 1994-09-12 1996-04-23 Tetra Laval Holdings & Finance S.A. Decanter centrifuge having an offset conveyor flight to aid rinsing
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
WO1999059725A1 (en) 1998-05-19 1999-11-25 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
WO2001032314A1 (en) * 1999-11-02 2001-05-10 Westfalia Separator Industry Gmbh Screw-type solid bowl centrifuge
US6749552B1 (en) * 1999-11-02 2004-06-15 Westfalia Separator Industry Gmbh Screw-type solid bowl centrifuge having a baffle plate arrangement
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
US6561965B1 (en) 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
US20070125704A1 (en) * 2001-12-07 2007-06-07 Ngk Insulators, Ltd. Ceramic filter and method for purifying water
US7156801B2 (en) * 2002-04-22 2007-01-02 Alfa Laval Copenhagen A/S Decanter centrifuge with a screw conveyor having a varying pitch
US20050202950A1 (en) * 2002-04-22 2005-09-15 Klaus Dircks Decanter centrifuge
US20050143245A1 (en) * 2002-05-08 2005-06-30 Werner Kohlstette Centrifuge especially a separator
US7074173B2 (en) 2002-05-08 2006-07-11 Westfalia Separator Ag Centrifuge having a centrifugal drum and a groove including a seal
US7056273B2 (en) 2002-05-29 2006-06-06 Westfalia Separator Ag Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof
US20050227848A1 (en) * 2002-05-29 2005-10-13 Wilhelm Ostkamp Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof
US20070049480A1 (en) * 2003-06-18 2007-03-01 Alfa Laval Corporate Ab Screw conveyor for a decanter centrifuge
US7229399B2 (en) * 2003-06-18 2007-06-12 Alfa Laval Corporate Ab Screw conveyor for a decanter centrifuge
US20080153687A1 (en) * 2003-08-08 2008-06-26 Michael Reichenbach Solid Bowl Screw Centrifuge Comprising a Centripetal Pump
US7510519B2 (en) * 2003-08-08 2009-03-31 Westfalia Separator Ag Solid bowl screw centrifuge comprising a centripetal pump with a throtting device
US7908764B1 (en) 2008-05-05 2011-03-22 Decanter Machines, Inc. Hyperbaric centrifuge system
US8042281B1 (en) 2008-05-05 2011-10-25 Decanter Machine, Inc. Hyperbaric centrifuge system
WO2010037101A1 (en) 2008-09-29 2010-04-01 Investigacion De Tecnologia Avanzada, S.A. De C.V. Method for the production of whole nixtamalized corn flour
CN101905193A (en) * 2010-07-12 2010-12-08 巨能机械(中国)有限公司 Rotary drum of horizontal spiral discharge sedimentation centrifuge
CN107206396A (en) * 2015-01-30 2017-09-26 安德里茨有限公司 Entity solid bowl centrifuge

Also Published As

Publication number Publication date
IS679B6 (en) 1969-04-22
IS1606A7 (en) 1967-04-22
DK124061B (en) 1972-09-11
DE1532678A1 (en) 1970-03-12
NO120465B (en) 1970-10-19

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