EP0159422A1 - Appareil centrifuge de concentration du type décanteur à vis sans fin - Google Patents

Appareil centrifuge de concentration du type décanteur à vis sans fin Download PDF

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Publication number
EP0159422A1
EP0159422A1 EP84302070A EP84302070A EP0159422A1 EP 0159422 A1 EP0159422 A1 EP 0159422A1 EP 84302070 A EP84302070 A EP 84302070A EP 84302070 A EP84302070 A EP 84302070A EP 0159422 A1 EP0159422 A1 EP 0159422A1
Authority
EP
European Patent Office
Prior art keywords
bowl
liquid
screw conveyor
screw
machine
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
EP84302070A
Other languages
German (de)
English (en)
Other versions
EP0159422B1 (fr
Inventor
Toshiyuki Toda
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.)
Kotobuki Engineering and Manufacturing Co Ltd
Original Assignee
Kotobuki Engineering and Manufacturing Co Ltd
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 Kotobuki Engineering and Manufacturing Co Ltd filed Critical Kotobuki Engineering and Manufacturing Co Ltd
Priority to AT84302070T priority Critical patent/ATE34094T1/de
Priority to DE8484302070T priority patent/DE3471015D1/de
Priority to EP84302070A priority patent/EP0159422B1/fr
Priority to ES531248A priority patent/ES531248A0/es
Publication of EP0159422A1 publication Critical patent/EP0159422A1/fr
Application granted granted Critical
Publication of EP0159422B1 publication Critical patent/EP0159422B1/fr
Expired legal-status Critical Current

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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
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the present invention relates to a screw decanter type centrifugal concentrating machine and more particularly to an improved screw decanter type centrifugal concentrating machine for continuously treating so-called suspension containing fine solid particles in liquid with the aid of centrifugal force to separate it into concentrated liquid containing a high content of solid particles and residual liquid containing no solid particle or a very few amount of solid particles.
  • a hitherto known screw decanter type centrifugal concentrating machine is generally constructed such that a required number of nozzles of which bore is selectively determined are disposed at the position located in the vicinity of a deposition area at the one end of a bowl where solid particles conveyed by a screw are deposited so as to discharge deposited solid particles through the nozzles which are usually located on a side wall 3 as illustrated in Fig. 1.
  • the present invention has been made with the foregoing drawbacks in mind and its object resides in providing an improved screw decanter type centrifugal concentrating machine which can easily adjust a ratio of flow rate of concentrated liquid to that of residual liquid in response to fluctuation in flow rate of supplied suspension, concentration of solid material or the like during operation of the machine and thereby assure a required concentration of concentrated liquid while consuming a reduced amount of power required for rotating the bowl.
  • a screw decanter type centrifugal concentrating machine which is operated by way of the steps of continuously supplying suspension through a support shaft for a bowl into the interior of the latter while it is rotating, causing solid material in suspension to be deposited on the inner surface of the bowl under the influence of centrifugal force, displacing deposited solid material toward the one end part of the bowl with the aid of a screw of which outer diameter is dimensioned appreciably smaller than the inner diameter of the bowl and which is coaxially rotated in the same direction as that of the bowl at a different rotational speed from that of the same, and continuously discharging concentrated liquid and residual liquid through the inner spaces in the horizontally extending hollow shafts disposed at the one side of the bowl while adjusting a discharge rate of both concentrated liquid and residual liquid.
  • a horizontally extending bowl 1 has side walls 2 and 3 fixedly secured thereto. Each of the side walls 2 and 3 is made integral with a hollow shaft which is horizontally supported by means of ball bearings 4 and 5.
  • the lefthand hollow shaft as seen in the drawing extends further through the ball bearing 4 and carries a pulley 6 at its foremost and which is fixedly mounted thereon.
  • a screw conveyor 7 includes a cylindrical barrel 9 and a spirally extending blade 8 in the form of a screw is integrally mounted on the barrel 9. As is apparent from the drawing, the outer diameter of the blade 8 is dimensioned appreciably smaller than the inner diameter of the bowl 1.
  • the barrel 9 has hollow shafts 12 and 13 fixedly secured to its side portions 10 and 11.
  • the hollow shaft 12 is rotatably supported by means of ball bearings 14 firmly fitted into the pulley 6, whereas the hollow shaft 13 is rotatably supported by means of ball bearings 15.
  • the screw conveyor 7 is horizontally supported in the coaxial relation relative to the bowl 1 with the aid of both the hollow shafts 12 and 13.
  • the bowl 1 is rotated by the pulley 6 at a predetermined number of revolutions, whereas the screw conveyor 7 is rotated by the pulley 27 at another predetermined number of revolutions lower than that of the bowl 1.
  • Suspension F to be treated is introduced into the interior of the bowl 1 via an inlet port 16 attached to the foremost end of the hollow shaft 12 with a sealing member disposed on the latter, the cylindrical space 28 of the hollow shaft 12 and a plurality of radially extending guide vanes 17 on the inner surface of the side wall 2.
  • the guide vanes 17 serve to accelerate flowing speed of suspension F to a level corresponding to rotational speed of the bowl 1 whereby turbulence of suspension in the bowl 1 can be minimized.
  • solid particles in suspension enter the bowl 1, they are caused to be displaced toward the inner surface of the bowl 1 under the influence of centrifugal force produced by rotation of the latter and thereafter they are conveyed toward the side wall 3 with the aid of the screw conveyor.
  • Concentrated liquid S is scooped by a plurality of scooping tubes 18 or grooves equivalent to the scooping tubes 18 and flows through the tubular space as defined by the axial extension 29 of the side wall 3 and the hollow shaft 13 so that it is continuously discharged from a concentrated liquid outlet port 21.
  • residual liquid L with no solid particle contained therein is scooped into a plurality of radially extending passages 20 on the guide plate 19 and flows through the cylindrical space 30 in the hollow shaft 13 so that it is continuously discharged from a residual liquid outlet port 24 via a residual liquid discharging device 22 disposed at the outermost end of the hollow shaft 13.
  • the discharging device 22 is provided with a hydraulically operated throttle valve 23 of which opening is adjusted such that a volumetric ratio of concentrated liquid to residual liquid, that is, concentration of solid particle in concentrated liquid and residual liquid is maintained within a predetermined range.
  • Fig. 5 schematically illustrates flowing of liquid and displacement of solid material as described above with reference to Fig. 1.
  • a throttle valve 26 adapted to be adjusted from the outside is disposed at the position located outwardly of the concentrated liquid outlet port 21 in order that concentration and flow rate of concentrated liquid are maintained within a predetermined range.
  • a flow rate of liquid to be supplied is adjusted in dependence on the adjustment of the throttle valve 21 as described above.
  • These throttle valves may be designed in the form of an automatically controlled valve. By employing automatically controlled valves it is possible to automatically operate the centrifugal concentrating machine of the invention while adjustment is made in dependence on flow rate or concentration of initial liquid prior to separating.
  • centrifugal concentrating machine of the invention Another advantageous feature of the centrifugal concentrating machine of the invention is that power required for rotating the machine can be reduced.
  • power consumed for operating the centrifugal concentrating machine can be expressed by the following equation on the assumption that positional energy and kinematic energy of supplied liquid are neglected.
  • P total consumed power
  • P 0 power consumed at a time when the machine is not loaded, that is, when no liquid is supplied
  • Q 1 discharge rate of concentrated liquid
  • E 1 is kinematic energy carried by concentrated liquid
  • Q 2 discharge rate of residual liquid
  • E 2 is kinematic energy carried by residual liquid
  • n is inside loss coefficient.
  • kinematic energy of discharged liquid is in proportion to square of peripheral speed as measured at the discharge position. Since the machine of the invention is constructed such that the discharge position is located closer to the axis of . rotation than that of the conventioal machine, kinematic energy required for the former can be reduced and therefore consumed power can be reduced remarkably.
  • the machine of the invention employs a bowl which has no projection and recess or opening on the side walls and the peripheral surface and therefore it is simple and flat in structure, resistance caused by air is reduced and no blower function is recognized. Moreover, since the bowl is fully housed in an airtight housing 25, scattering of flowing air into the environment is completely inhibited, resulting in no occurence of power loss due to scattering of flowing air.
  • Fig. 6 comparatively illustrates characteristics of the centrifugal concentrating machine of the invention (having a bowl diameter of 90 cm, a bowl length of 250 cm to be rotated at 1,000 r.p.m.) and those of the conventional one which is designed in the same dimensions to be rotated at the same number of revolutions particularly in respect of power required for rotation.
  • As liquid to be treated excessive activated sludge is used.
  • abscissa represents supply rate Q (m 3 /hr) of activated sludge and ordinate does consumed electric power P (KW).
  • reference symbol a represents a characteristic line of the machine of the invention and reference symbol S does that of the conventional machine.
  • the machine of the invention consumes an amount of electric power less than that of the conventional one. Further, since the machine of the invention has an area of deposition larger than that of the conventional one designed in the same dimensions, a supply rate of liquid to be treated can be increased in proportion to an area of deposition and therefore electric power consumed by the machine of the invention per unit volume of supplied liquid can be reduced correspondingly. Accordingly, it can be concluded that the machine of the invention is designed in the so-called energy saving type.
  • the screw decanter type centrifugal concentrating machine of the invention makes it possible to adjust discharge rate of concentrated liquid and residual liquid or concentration of solid material contained in both liquids discharged from the machine during its operation. Further, another advantageous features of the invention are that electric power required for operation of the machine is consumed less than the conventional one designed in the same dimensions and moreover electric power consumed by the machine of the invention per unit volume of supplied liquid is reduced considerably lower than that of the conventional one.

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  • Centrifugal Separators (AREA)
EP84302070A 1984-03-27 1984-03-27 Appareil centrifuge de concentration du type décanteur à vis sans fin Expired EP0159422B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT84302070T ATE34094T1 (de) 1984-03-27 1984-03-27 Zentrifugalkonzentrationsmaschine vom schneckendekantertyp.
DE8484302070T DE3471015D1 (en) 1984-03-27 1984-03-27 Screw decanter type centrifugal concentrating machine
EP84302070A EP0159422B1 (fr) 1984-03-27 1984-03-27 Appareil centrifuge de concentration du type décanteur à vis sans fin
ES531248A ES531248A0 (es) 1984-03-27 1984-04-03 Una maquina de concentracion centrifuga del tipo de decantador de tornillo sin fin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84302070A EP0159422B1 (fr) 1984-03-27 1984-03-27 Appareil centrifuge de concentration du type décanteur à vis sans fin

Publications (2)

Publication Number Publication Date
EP0159422A1 true EP0159422A1 (fr) 1985-10-30
EP0159422B1 EP0159422B1 (fr) 1988-05-11

Family

ID=8192604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84302070A Expired EP0159422B1 (fr) 1984-03-27 1984-03-27 Appareil centrifuge de concentration du type décanteur à vis sans fin

Country Status (4)

Country Link
EP (1) EP0159422B1 (fr)
AT (1) ATE34094T1 (fr)
DE (1) DE3471015D1 (fr)
ES (1) ES531248A0 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608664A1 (de) * 1986-03-14 1987-09-17 Krauss Maffei Ag Vollmantelzentrifuge
DE3638652A1 (de) * 1986-11-12 1988-06-01 Flottweg Bird Mach Gmbh Vollmantel-schneckenzentrifuge
GB2233258A (en) * 1989-06-29 1991-01-09 Kloeckner Humboldt Deutz Ag Setting the radial liquid level in solid sleeve centrifuges
GB2255519A (en) * 1991-05-10 1992-11-11 Kloeckner Humboldt Deutz Ag Separating a solid-liquid mixture
DE4231063A1 (de) * 1992-09-17 1994-03-24 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge zum Klären oder Trennen eines Flüssigkeits-Feststoffgemisches
EP0602670A2 (fr) * 1992-12-18 1994-06-22 Tsukishima Kikai Co. Ltd. Appareil centrifuge de concentration
JP2018043211A (ja) * 2016-09-16 2018-03-22 株式会社クボタ 遠心分離機
EP4272870A1 (fr) * 2022-05-05 2023-11-08 Hermeler, Jürgen Centrifugeuse décanteuse

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3317047A1 (de) * 1982-05-28 1984-01-05 VEB Chemieanlagenbaukombinat Leipzig-Grimma, DDR 7240 Grimma Vollmantel-schneckenzentrifuge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE48615C (de) * CL. Freiherr VON BECHTOLSHEIM in München, Kaulbachstrafse 3 Neuerung an Scheidecentrifugen
JPS58137454A (ja) * 1982-02-05 1983-08-15 Hitachi Ltd 二重構造遠心分離機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3317047A1 (de) * 1982-05-28 1984-01-05 VEB Chemieanlagenbaukombinat Leipzig-Grimma, DDR 7240 Grimma Vollmantel-schneckenzentrifuge

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784634A (en) * 1986-03-14 1988-11-15 Krauss-Maffei A.G. Solid bowl centrifuge
DE3608664A1 (de) * 1986-03-14 1987-09-17 Krauss Maffei Ag Vollmantelzentrifuge
DE3638652A1 (de) * 1986-11-12 1988-06-01 Flottweg Bird Mach Gmbh Vollmantel-schneckenzentrifuge
GB2233258B (en) * 1989-06-29 1993-10-06 Kloeckner Humboldt Deutz Ag Solid sleeve centrifuge with adjustable liquid outlets
GB2233258A (en) * 1989-06-29 1991-01-09 Kloeckner Humboldt Deutz Ag Setting the radial liquid level in solid sleeve centrifuges
GB2255519B (en) * 1991-05-10 1995-05-17 Kloeckner Humboldt Deutz Ag A method and apparatus for separating, more especially classifying, a solid-liquid mixture
GB2255519A (en) * 1991-05-10 1992-11-11 Kloeckner Humboldt Deutz Ag Separating a solid-liquid mixture
DE4231063A1 (de) * 1992-09-17 1994-03-24 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge zum Klären oder Trennen eines Flüssigkeits-Feststoffgemisches
EP0602670A2 (fr) * 1992-12-18 1994-06-22 Tsukishima Kikai Co. Ltd. Appareil centrifuge de concentration
EP0602670A3 (fr) * 1992-12-18 1994-12-21 Tsukishima Kikai Co Appareil centrifuge de concentration.
US5542903A (en) * 1992-12-18 1996-08-06 Tsukishima Kikai Co., Ltd. Centrifugal liquid separating machine using deceleration vanes
US5685819A (en) * 1992-12-18 1997-11-11 Tsukishimi Kikai Co., Ltd. Centrifugal liquid separating machine using deceleration vanes
JP2018043211A (ja) * 2016-09-16 2018-03-22 株式会社クボタ 遠心分離機
EP4272870A1 (fr) * 2022-05-05 2023-11-08 Hermeler, Jürgen Centrifugeuse décanteuse

Also Published As

Publication number Publication date
ATE34094T1 (de) 1988-05-15
ES8503529A1 (es) 1985-03-01
DE3471015D1 (en) 1988-06-16
EP0159422B1 (fr) 1988-05-11
ES531248A0 (es) 1985-03-01

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