US3559811A - Multiple hydrocyclone system - Google Patents

Multiple hydrocyclone system Download PDF

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Publication number
US3559811A
US3559811A US876803A US3559811DA US3559811A US 3559811 A US3559811 A US 3559811A US 876803 A US876803 A US 876803A US 3559811D A US3559811D A US 3559811DA US 3559811 A US3559811 A US 3559811A
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United States
Prior art keywords
cyclones
pump
axis
cyclone
layer
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Expired - Lifetime
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US876803A
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English (en)
Inventor
Bengt Ingmar Dahlberg
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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
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C7/00—Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00

Definitions

  • a centrifugal pump has a housing containing a plurality of pump rotors spaced along a common rotation axis and also containing layers of cyclones in the spaces between adjacent rotors, the cyclones of each layer being disposed radially in a circle or ring concentric to the rotation axis and with their narrow ends directed toward this axis and provided with an outlet, each cyclone having an inlet at its wide end portion.
  • the cyclones of one layer have their inlets connected to the pressure side of a pump rotor and have their outlets connected to the suction side of a pump rotor, whereby the cyclone layers are connected in series so as to effect progressive concentration ofa sludge contained in a suspension.
  • the present invention relates to a multiple hydrocyclone system of the type having cyclones located in the housing of a centrifugal pump and arranged in a ring or circle concentric to the axis of rotation of the pump.
  • a cyclone system is known in the art and is disclosed, for example, in the Swedish Pat. No. 166,096.
  • This cyclone system allows a separation in only one stage; and the same is true of the cyclone system according to Swedish Pat. No. 181,191.
  • An object of the present invention is to provide a multiple hydrocyclone system of the above-described type which enables a separation in a plurality of stages while utilizing a compact arrangement, and which eliminates pipelines and pumps connected between the different stages of conventional multiple stage systems.
  • the housing of the centrifugal pump contains a plurality of pump rotors spaced along a common rotation axis; and in the spaces between adjacent rotors are layers of cyclones, the cyclones of each layer being disposed radially of the aforesaid axis with their narrow ends directed toward the axis and provided with outlets from the respective cyclones.
  • the wide end portions of the cyclones are provided with inlets; and the inlets of the cyclones of one layer are connected to the pressure side of a pump rotor, while the outlets from the narrow ends of the cyclones in a layer open at the suction side of a pump rotor.
  • An arrangement of this kind makes it possible, by means of cyclone layers connected in series to each other, to concen- -trate in successive stages a sludge contained in a suspension.
  • a special arrangement of the invention intended for countercurrent washing, is characterized in that outlets from the wide ends of the cyclones in a layer are connected to the suction side of that rotor which feeds, the cyclones in an adjacent layer.
  • the pump rotors can be vaneless in the region of the inlets of the cyclones.
  • the latter are fed without pulsation effects generated by the rotors, which effects would have a disturbing influence on the separation course in the cyclones.
  • FIG. I is a flow diagram of a preferred form of the new cyclone system as illustrated in FIGS. 2 and 3;
  • FIG. 2 is an axial sectional view of a portion of the preferred form, the parts on one side of the axis being omitted;
  • FIG. 3 is a side elevational view of the preferred form.
  • each of the cyclones shown at 1, 2 and 3 represents only one of the cyclones in a corresponding layer of cyclones located between a pair of adjacent pump rotors, the cyclones in each layer being arranged in a circle or ring concentric to the axis of the rotors, as previously described.
  • Four rotors of the centrifugal pump are indicated at 4, 5, 6 and 7, these rotors being spaced axially along a common pump shaft (not, shown) to provide the three interrotor spaces for the three cyclone layers 1, 2 and 3.
  • the pump rotors 5, 6 and 7 feed the cyclones 1, 2 and 3 through channels 8, 9 and 10, respectively.
  • the inlet into the cyclone system for the starch suspension to be separated is designated at 11 and the outlet for washed starch concentrate is designated at 12. Washing water is supplied to the suction side of the pump rotor 5 through an inlet 13 and dilutes starch concentrate coming from the cyclone 2 and then being separated in the cyclone 1.
  • a motor-driven shaft 17 drives the pump rotors, three of which are indicated at 18.
  • Each pump rotor 18 feeds a layer of cyclones, one cyclone in each layer being shown at 19 and two such cyclones being shown in FIG. 2.
  • Each cyclone is provided at its wide end portion with a tangential inlet 20 shaped as a guide vane, so that the pumping effect is kept low.
  • the pump housing comprises stationary discs 21 of which two are shown in FIG. 2. These discs are provided at their peripheries with radially directed holes in which the cyclones 19 are inserted, and the outer ends of these holes are closed by plugs 22 provided with cyclone outlets 23 from the wide end portions of the cyclones.
  • the cyclones have additional outlets 24 for starch concentrate, these outlets being at the narrow ends of the cyclones and being directed toward the shaft or rotation axis 17.
  • the pump housing also includes discs 25 inserted between the discs 21.
  • the discs 21 and 25 have recesses extending radially in the direction towards the pump shaft 17 and for stiffening are provided with radial vanes 26 and 27 arranged in these recesses. Thus, these vanes form radial channels leading towards the suction side 18a of the pump rotors.
  • the cyclone outlets 24 open into the radial channels formed by the vanes 26; and channels 28 leading from the outlets 23 open into the radial channels formed by the vanes 27.
  • the pump rotors 18 have radial vanes 29 which terminate in edges 30, so that each rotor 18 has a vaneless region 31 which opens toward the inlet 20 of each cyclone in a layer of cyclones. Due to the low pressure prevailing at the center of the pump, labyrinth sealings 32 are sufficient to seal between the inner edge of the discs 21 and the pump rotors 18.
  • 33 designates an electric motor which drives the pump shaft 17.
  • the multiple hydrocyclone system proper is formed by the discs 21 which, by means of bolts 34 and 35, are kept clamped together between two end walls 36 and 37 and in that way form a housing which is supported by a frame 38.
  • the starch suspension to be separated and washed is fed to the pump rotor 18 located farthest to the right and is pumped radially outward to the vaneless space 31 opening toward the inlet 20 of each cyclone 19 in the adjacent layer of cyclones.
  • This feeding of the suspension to the extreme right-hand rotor 18 is effected through the inlet 11 (FIG. 1) which delivers the suspension to the rotors suction side 18a by way of a suitable passage (not shown) in the pump housing.
  • the pulsations generated by the pump rotor vanes 29 are smoothed out so that the starch suspension enters each cyclone as a uniform flow.
  • the water being separated off is discharged from the system through the corresponding cyclone outlet 23 and channel 28, while the starch concentrate leaves the corresponding cyclone outlet 24 and is fed by the next pump rotor 18 to each cyclone 19 in the next (to the left) layer of cyclones, until the concentrate, having been washed clean, leaves the last layer of cyclones (situated farthest to the left) in the system. Pure washing water is led into the system through the channel 28, situated farthest to the left, and dilutes the starch concentrate which leaves the outlet 24 of each cyclone 19 in the layer situated farthest but one to the left.
  • This water is then separated off in the cyclones situated farthest to the left and passes through their outlets 23 and the corresponding channels 28 to the inlets of the next cyclones, calculated in the direction to the right, until it is fed into the cyclones situated farthest to the right.
  • a washing in countercurrent to the starch concentrate leaving the cyclone system has been effected.
  • the present cyclone system requires only one motor and pump, common to all separation stages, and forms a compact design which requires little space and can be assembled completely in a factory.
  • a centrifugal pump including a housing and a plurality of pump rotors disposed in the housing and adapted to be driven about a common axis, said rotors being spaced from each other along said axis and each having a suction side and a pressure side located, respectively, at a relatively small radius and a relatively large radius from said axis, and layers of cyclones disposed in the housing in the spaces between adjacent rotors and with the cyclones of each layer arranged in a ring concentric to said axis, each cyclone extending radially of said axis and having its narrow end directed toward said axis and provided with an outlet, each cyclone also having an inlet at its wide end portion, the cyclones of one layer having their said inlets connected to said pressure side of a pump rotor and having their said outlets located at said suction side of a pump rotor.

Landscapes

  • Cyclones (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US876803A 1968-11-15 1969-11-14 Multiple hydrocyclone system Expired - Lifetime US3559811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE15514/68D SE329591B (enrdf_load_stackoverflow) 1968-11-15 1968-11-15

Publications (1)

Publication Number Publication Date
US3559811A true US3559811A (en) 1971-02-02

Family

ID=59012404

Family Applications (1)

Application Number Title Priority Date Filing Date
US876803A Expired - Lifetime US3559811A (en) 1968-11-15 1969-11-14 Multiple hydrocyclone system

Country Status (5)

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US (1) US3559811A (enrdf_load_stackoverflow)
DE (1) DE1955521A1 (enrdf_load_stackoverflow)
GB (1) GB1213259A (enrdf_load_stackoverflow)
NL (1) NL6917091A (enrdf_load_stackoverflow)
SE (1) SE329591B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189377A (en) * 1977-03-09 1980-02-19 Alfa-Laval Ab Multiple cyclone separator
US4216796A (en) * 1976-09-08 1980-08-12 Charles L. Steward Apparatus for interconnecting tanks to prevent overflows and spills
DE2953260A1 (de) * 1978-08-16 1980-10-02 Dorr Oliver Inc Mehrfachhydrozyklonvorrichtung
US4298359A (en) * 1979-06-23 1981-11-03 Passavant-Werke Michelbacher Huette Centrifugal separator having heat transfer means
US4399041A (en) * 1981-05-26 1983-08-16 International Coal Refining Company Process for particulate removal from coal liquids
US4948517A (en) * 1989-03-21 1990-08-14 Amoco Corporation System for preventing oil droplet size reduction
US5314124A (en) * 1987-11-30 1994-05-24 Genesis Research Corporation Coal cleaning process
US5794791A (en) * 1987-11-30 1998-08-18 Genesis Research Corporation Coal cleaning process
CN108970817A (zh) * 2017-07-31 2018-12-11 安徽联河股份有限公司 一种用于分离米淀粉和米蛋白的旋流器

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216796A (en) * 1976-09-08 1980-08-12 Charles L. Steward Apparatus for interconnecting tanks to prevent overflows and spills
US4189377A (en) * 1977-03-09 1980-02-19 Alfa-Laval Ab Multiple cyclone separator
DE2953260A1 (de) * 1978-08-16 1980-10-02 Dorr Oliver Inc Mehrfachhydrozyklonvorrichtung
US4260480A (en) * 1978-08-16 1981-04-07 Dorr-Oliver Incorporated Multiple hydrocyclone device
US4298359A (en) * 1979-06-23 1981-11-03 Passavant-Werke Michelbacher Huette Centrifugal separator having heat transfer means
US4399041A (en) * 1981-05-26 1983-08-16 International Coal Refining Company Process for particulate removal from coal liquids
US5314124A (en) * 1987-11-30 1994-05-24 Genesis Research Corporation Coal cleaning process
US5794791A (en) * 1987-11-30 1998-08-18 Genesis Research Corporation Coal cleaning process
US4948517A (en) * 1989-03-21 1990-08-14 Amoco Corporation System for preventing oil droplet size reduction
CN108970817A (zh) * 2017-07-31 2018-12-11 安徽联河股份有限公司 一种用于分离米淀粉和米蛋白的旋流器

Also Published As

Publication number Publication date
SE329591B (enrdf_load_stackoverflow) 1970-10-19
GB1213259A (en) 1970-11-25
DE1955521A1 (de) 1970-10-01
NL6917091A (enrdf_load_stackoverflow) 1970-05-20

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