EP0447742B1 - Decanter centrifuge - Google Patents

Decanter centrifuge Download PDF

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Publication number
EP0447742B1
EP0447742B1 EP91100071A EP91100071A EP0447742B1 EP 0447742 B1 EP0447742 B1 EP 0447742B1 EP 91100071 A EP91100071 A EP 91100071A EP 91100071 A EP91100071 A EP 91100071A EP 0447742 B1 EP0447742 B1 EP 0447742B1
Authority
EP
European Patent Office
Prior art keywords
bowl
ring
head
discharge port
shaped
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.)
Expired - Lifetime
Application number
EP91100071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0447742A3 (en
EP0447742A2 (en
Inventor
Katsunori Nishida
Hiroshi Sano
Eiji Ichinose
Ascher H. Dr.Shapiro
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 Holdings LLC
Original Assignee
Baker Hughes Inc
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 Baker Hughes Inc filed Critical Baker Hughes Inc
Publication of EP0447742A2 publication Critical patent/EP0447742A2/en
Publication of EP0447742A3 publication Critical patent/EP0447742A3/en
Application granted granted Critical
Publication of EP0447742B1 publication Critical patent/EP0447742B1/en
Anticipated expiration legal-status Critical
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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
    • B04B2001/2075—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 means for recovering the energy of the outflowing liquid
    • 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

  • This invention relates to a decanter centrifuge used for a solid-liquid separation of a feed solution containing suspended solids.
  • this type of centrifuge comprises a bowl 1 which rotates with a high rotative speed, a screw-conveyor 2 which is disposed coaxially with the rotating bowl 1 and which is pivoted by the rotating bowl 1 so as to be included in the bowl 1. Then, a screw blade 13 is helically provided around the conveyor 2 so that there is a narrow gap between the inner surface of the bowl 1 and the external circumference of the screw blade 13. The rotating bowl 1 and the screw conveyer 2 rotate in the same direction, while there is a necessary differential rotative speed between the bowl 1 and the conveyor 2.
  • a feed solution is introduced, through a supply pipe 10, to the rotating bowl 1 from the supply port 10a of the supply pipe 10. Then, due to centrifugal force caused by the rotation of the bowl 1, the feed solution is sprayed to the inner surface of the rotating bowl 1. Therefore, a pool 14 is formed in the bowl 1.
  • the solidified particles of the suspended solids are separated from a clarified liquid to be sedimented on the bottom of the pool 14. The solidified particles of the suspended solids are scraped together towards the right side of this figure by the screw blade 13 and discharged.
  • the clarified liquid overflows from a liquid discharge port 4 formed on a bowl-head 3 of the bowl 1 and is discharged from the bowl 1.
  • a ring-shaped or a board-shaped weir 30 is normally attached to the external side of the base of the bowl-head 3 adjacent to the liquid discharge port 4, in order to adjust the level of the pool 14.
  • hp 7.61 x Q x (2r)2 x N2 x 10 ⁇ 7
  • hp accelerating power (KW)
  • Q flow rate (m3/hr)
  • r radius (m)
  • N number of revolution (rpm)
  • the accelerating power (P) can be decreased resulting in saving the amount of required power.
  • the capacity of the rotating bowl 1 for containing the feed solution can be increased. This provides an improved separating efficiency.
  • a liquid discharge port 4 is formed so as to cross slantingly the base of a bowl-head 3.
  • the liquid discharge port provided on the bowl-head should be formed so as to be adjacent to the axis of the bowl head (See US-A-3,423,015).
  • torsional stress is increased at this axis, further, bending stress in the direction of the axis is applied there. Accordingly, the liquid discharge port placed to be adjacent to the rotating axis often causes a problem related to the structural strength of the bowl-head. Therefore, this method for raising the level of the pool always can not be carried out because of the problem related to the structural strength.
  • apparatus shown in Japanese Utility Model Publication No. 60-31793 requires high energy for discharging, thus, can not save the amount of required power.
  • apparatus shown in Japanese Patent Publication No. 63-31261 is not suitable for discharging solids having a low water content, additionally, this apparatus has problems related to the abrasion of the skimming-blade and other problems related to its complicated structure.
  • a rotating bowl is provided with at least one solid discharge port and at least one clarified liquid discharge port.
  • a screw conveyor is disposed coaxially with the rotating bowl so as to be included in the rotating bowl. The rotating bowl and the screw conveyor are rotated in the same direction with a differential rotative speed.
  • a feed solution to be separated is introduced into a ring-shaped space formed between the rotating bowl and the screw conveyor. The feed solution is continuously separated into solid and liquid by centrifugal force. Then, the solid is discharged from the solid discharge port and the liquid is discharged from the clarified liquid discharge port.
  • This centrifuge is characterized by the provision of clarified liquid discharging apparatus which comprises the clarified liquid discharge port, a ring-shaped weir and a plurality of reducing blades.
  • Each clarified liquid discharge port is formed on a bowl-head of the rotating bowl so that the inner side of the bowl and the external side of the bowl-head can communicate with each other.
  • the ring-shaped weir is mounted on the external face of the bowl-head. Then, a ring-shaped overflow cavity is provided in the ring-shaped weir so as to communicate with each clarified liquid discharge port.
  • the ring-shaped weir coaxially has a peripheral opening directing the rotative axis of the bowl-head.
  • the plurality of reducing blades is provided in the ring-shaped overflow cavity of the ring-shaped weir in a radial direction from the rotative axis of the bowl-head. Then, the cavity is divided into a plurality of portions while each reducing blade is fixed on at least one of the internal face of the ring-shaped weir and the external face of the bowl-head.
  • At least one, or preferably a plurality of liquid discharge port 4, 4 are provided on the periphery of the bowl-head 3, with a predetermined space so that the inner side of the rotating bowl 1 and the external side of the bowl-head 3 can communicate each other through the liquid discharge port 4.
  • a ring-shaped weir 5 is mounted on the external face of the base of the bowl-head 3.
  • the weir 5 there is a ring-shaped overflow cavity, which commnunicate with each liquid discharge port 4 and which coaxially has a peripheral opening directing the rotative axis of this bowl-head 3.
  • the level of the pool 14 is determined by the position of the overflow cavity of the weir 5 on its radius direction, the level of the pool 14 can be raised easily. However, even if the level is raised, since the clarified liquid beyond the liquid discharge port 4 reaches soon at the overflow cavity of the above mentioned ring-shaped weir 5, blade free vortex flow is produced. Then, the clarified liquid overflows the ring-shaped weir 5 with a peripheral velocity, which is the same as or larger than its peripheral velocity at the liquid discharge port 4. Accordingly, pressure drop is increased at the overflow cavity of the ring-shaped weir 5 resulting in decreasing of the amount of overflown clarified liquid.
  • a plurality of blades 6 as speed reducing blades is provided in the lip portion of the ring-shaped weir 5 in a radial direction.
  • Each speed reducing blade can be fixed to the internal face of the ring-shaped weir 5, to the external face of the bowl-head 3, or to the both faces so as to cross them.
  • peripheral velocity and the radius at the clarified liquid discharge port 4 are indicated by V4 and r4 respectively and the peripheral velocity and the radius at the ring-shaped weir 5 are indicated by V7 and r7 respectively.
  • V4r4 V7r7
  • V7 V4 r4 r7 in case of the provision of the reducing blades
  • V4 > V7 therefore, the amount of required power is decreased.
  • V7 > V4 in case of the blade free vortex flow without the reducing blades, V7 > V4, therefore, the amount of required power is increased.
  • a decanter centrifuge related to the present invention has the following structure.
  • a rotating bowl 1 is a combination of a conical section and a cylindrical section.
  • a bowl-head 3 is fixed at the larger radius side of the rotating bowl 1 so as to close completely the rotating bowl 1.
  • the hollow axis 8 of the bowl-head 3 is extended from the bowl-head 3 so as to communicate with the hollow of the rotating bowl 1.
  • the hollow axis 9 of the bowl 1 is extended from the back end of the bowl 1 so as to communicate with the hollow of the rotating bowl 1.
  • the hollow axis 8 of the bowl-head 3 and the hollow axis 9 of the bowl 1 are pivoted by bearing stands 18 and 19 respectively. Accordingly, the rotating bowl 1 can be supported horizontally and rotated with a high rotative speed by a rotational force, which is transformed by rotating driving means (not shown).
  • a screw conveyor 2 is provided in the hollow portion of the rotating bowl 1.
  • the screw conveyor 2 is pivoted coaxially with the rotating horizontal axis of the bowl 1 by means of bearings 16 and 17.
  • a hollow tube 12 of the screw conveyor 2 is provided horizontally at the center of the rotating bowl 1.
  • a screw blade 13 extends helically the full length of the hollow tube 12 so as to almost reach the inner surface of the bowl 1.
  • a transforming rod 20 is provided in the hollow axis 8 of the bowl-head 3. Its one end is connected to the end face of the hollow tube 12 of the screw conveyor 2 and its another end is connected to a gear unit 22.
  • the rotational force from the above mentioned rotating driving means (not shown) is transformed, through the intermediary of the gear unit 22, to the transforming rod 20.
  • the screw conveyor 2 can be rotated with the high rotative speed.
  • the rotating bowl 1 and the screw conveyor 2 are rotated in the same direction, while there is a slightly differential speed between them, which is accomplished by means of the gear unit 22.
  • a solid discharge port 11 is formed at the smaller radius side of the rotating bowl 1 on the right side of this figure so that solidified particles scraped together can be discharged from the solid discharge port 11. Then, liquid discharge ports 4, 4 are formed on the base of the bowl-head 3 at the larger radius side of the rotating bowl 1.
  • the portion, where the clarified liquid is overflown from each liquid discharge port 4, corresponds to clarified liquid discharging apparatus. Since the present invention is characterized by this portion, this portion will be explained closely referring to Fig. 2.
  • the above mentioned plurality of clarified liquid discharge ports 4, 4 are formed so as to be disposed on the periphery of the base of the bowl-head 3 with a predetermined space and so as to be apart from the rotative center of the bowl-head 3 with a predetermined radius. Then, the ring-shaped weir 5 is mounted oil the gear unit-side face of the base of the bowl-head 3. In the weir 5, there is a ring-shaped overflow cavity, which communicate with each liquid discharge port 4 and which coaxially has a peripheral opening directing the rotative axis of this bowl-head 3. Accordingly, as shown in Fig. 1, by connecting the overflow cavity and the liquid discharge ports 4, 4, a L-shaped cross section is formed.
  • ring-shaped weir 5 In the lip portion of this ring-shaped weir 5, plural number of reducing blades 6 are provided in a radial direction so as to divide the ring-shaped overflow cavity into a plurality of portions while each reducing blade is disposed between one liquid discharge ports 4 and an adjacent discharge port 4. Additionally, a ring-shaped adjusting weir board 7 is mounted on the gear unit-side face of the weir 5 so as to be removable. This adjusting weir board 7 can be changed with another adjusting weir board 7 having a different inner diameter as desired, thus, the level of the pool 14 can be adjusted within the predetermined highest and lowest limits.
  • a supply pipe 10 is inserted through the hollow tube 12 of the screw conveyor 2 so as to supply the feed solution to be separated. Then, a hole 15 for the feed solution to be separated is formed on the peripheral face of the hollow tube 12 so as to correspond to the supply port 10a of the supply pipe 10. In the bowl 1, the external side of the hollow tube 12 can communicate with its internal side through the hole 15.
  • the feed solution to be separated is supplied from the supply pipe 10, while the rotating bowl 1 and the screw conveyor 2 are rotated with each high rotative speed, the feed solution is introduced to the external side of the hollow tube 12 within the rotating bowl 1 through the hole 15 formed on the hollow tube 12.
  • the feed solution in the rotating bowl 1 is continuously splashed toward the peripheral face of the rotating bowl 1 by a centrifugal force caused by the rotation of the rotating bowl 1. Therefore, the pool 14 is formed along the peripheral face of the rotating bowl 1.
  • the solidified particles of the feed solution are separated from the clarified liquid to be segmented on the bottom of the pool 14. These particles are scraped towards the right side of Fig. 1 by means of the screw blade 13 and discharged from the solid discharge port 11.
  • the separated clarified liquid is discharged from the liquid discharge ports 4, 4 formed on the bowl-head 3 and overflown beyond the adjusting weir board 7 outwardly from the rotating bowl 1.
  • a hood 21 is formed so as to encircle the rotating bowl 1. Therefore, the discharged solidified particles and the clarified liquid can be prevented from being splashed outside of the hood 21.
  • the reducing blades 6 are fixed only to the internal face of the ring-shaped weir 5. However, they can be fixed to only the external face of the bowl-head 3 or to the both faces so as to cross both faces.
  • Apparatus of the present invention can be utilized for concentrating separation of slurry as well as solid-liquid separation explained before.
  • the meaning of the solidified particles in the present invention is not limited to the solids and includes also the concentrated solution.
  • a decanter centrifuge was used in this example.
  • the pool level of this decanter centrifuge could not be set higher than 130 mm due to the structural strength problem of the bowl-head 3 at its clarified liquid discharge port-side portion.
  • This decanter centrifuge was modified and provided with the clarified liquid discharging apparatus described in the present invention. Then, a slurry-solution, whose supplied slurry concentration is 0.5-1.0 %, was applied with the flow rate of 20 m3/hr.
  • the level of the pool 14 could be raised to be 180 mm. It is concluded that the amount of required power could be reduced by 15-25 %.
  • the pool level of the conventional centrifuge could not be set higher than 130 mm.
  • the decanter centrifuge related to the present invention has the pool level of 180 mm. Operations were carried out by these two kinds of centrifuges respectively, with the same concentration of the supplied slurry.
  • the treating capacity for concentrating slurry (Q) was 20 m3 / hr and the SS recovery was approximately 90 %.
  • the treating capacity for concentrating slurry (Q) was 25 m3 / hr and the SS recovery was approximately 93-95 %. It is concluded that the containing capacity of the rotating bowl is increased, thus, the separating efficiency is extremely improved.

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  • Centrifugal Separators (AREA)
EP91100071A 1990-03-19 1991-01-02 Decanter centrifuge Expired - Lifetime EP0447742B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP69019/90 1990-03-19
JP2069019A JP2997700B2 (ja) 1990-03-19 1990-03-19 デカンタ型遠心分離機

Publications (3)

Publication Number Publication Date
EP0447742A2 EP0447742A2 (en) 1991-09-25
EP0447742A3 EP0447742A3 (en) 1991-12-18
EP0447742B1 true EP0447742B1 (en) 1994-05-18

Family

ID=13390455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91100071A Expired - Lifetime EP0447742B1 (en) 1990-03-19 1991-01-02 Decanter centrifuge

Country Status (5)

Country Link
EP (1) EP0447742B1 (da)
JP (1) JP2997700B2 (da)
AT (1) ATE105739T1 (da)
DE (1) DE69102002T2 (da)
DK (1) DK0447742T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012161560A3 (en) * 2011-05-24 2013-03-28 Lok Kong Loh Tong Weng Modern decanter

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313985A (ja) * 1996-05-27 1997-12-09 Kotobuki Giken Kogyo Kk 横型遠心濃縮装置
KR100398168B1 (ko) * 2000-10-10 2003-09-19 임광석 산업용 원심분리기
DE10203652B4 (de) * 2002-01-30 2006-10-19 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge mit einem Wehr
JP5009764B2 (ja) * 2007-12-06 2012-08-22 巴工業株式会社 横型遠心分離装置およびダム形成部材
KR101111490B1 (ko) * 2010-03-10 2012-02-22 송윤화 내장형 감속유닛을 갖는 원심분리기
KR101152176B1 (ko) * 2010-11-01 2012-06-15 송윤화 내장형 감속유닛을 갖는 원심분리기
DK2918345T3 (da) 2014-03-14 2020-03-16 Andritz Sas Dekantercentrifuge
PL3398687T3 (pl) * 2017-05-04 2020-08-24 Andritz S.A.S. Wirówka dekantacyjna
CN117679796A (zh) * 2023-12-29 2024-03-12 瓮福达州化工有限责任公司 一种湿法磷酸中澄清槽底流固液分离系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3423015A (en) * 1967-08-23 1969-01-21 Ametek Inc Continuous centrifugal separator with pool depth control
DE2901607C2 (de) * 1979-01-17 1981-03-12 Westfalia Separator Ag, 4740 Oelde Vollmantelschneckenzentrifuge
US4334647A (en) * 1980-12-03 1982-06-15 Bird Machine Company, Inc. Centrifuges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012161560A3 (en) * 2011-05-24 2013-03-28 Lok Kong Loh Tong Weng Modern decanter

Also Published As

Publication number Publication date
JP2997700B2 (ja) 2000-01-11
DE69102002D1 (de) 1994-06-23
DE69102002T2 (de) 1994-09-01
JPH03270747A (ja) 1991-12-02
EP0447742A3 (en) 1991-12-18
EP0447742A2 (en) 1991-09-25
ATE105739T1 (de) 1994-06-15
DK0447742T3 (da) 1994-06-20

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