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WO1992009372A1 - Installation a hydrocyclones - Google Patents

Installation a hydrocyclones Download PDF

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Publication number
WO1992009372A1
WO1992009372A1 PCT/SE1991/000804 SE9100804W WO9209372A1 WO 1992009372 A1 WO1992009372 A1 WO 1992009372A1 SE 9100804 W SE9100804 W SE 9100804W WO 9209372 A1 WO9209372 A1 WO 9209372A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydrocyclone
chamber
fraction
sub
hydrocyclones
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.)
Ceased
Application number
PCT/SE1991/000804
Other languages
English (en)
Inventor
Roine Andersson
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.)
Celleco Hedemora AB
Original Assignee
Celleco Hedemora AB
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 Celleco Hedemora AB filed Critical Celleco Hedemora AB
Publication of WO1992009372A1 publication Critical patent/WO1992009372A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • 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
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • 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
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B04C5/28—Multiple arrangement thereof for parallel flow

Definitions

  • the present invention relates to a hydrocyclone plant comprising a great number of hydrocyclones arranged in groups of at least two hydrocyclones, each hydrocyclone having at least one inlet member for discharging a relatively small flow of a created first fraction of the liquid mixture, and a second outlet member for dischar ⁇ ging a relatively large flow of a created second frac- tion of the liquid mixture. Further, the plant comprises a main chamber for receiving said first fraction from all of the hydrocyclones. Each hydrocyclone group is provided with a sub-chamber for receiving said first fraction from the first outlet members of the hydro- cyclone group and each sub-chamber communicates with the main chamber via a connection passage.
  • each hydrocyclone is especially sensitive to exterior pressure variations occurring at the outlet member which discharges a relatively small flow of a created frac ⁇ tion.
  • the hydrocyclones would be less sensitive to such exterior pressure variations if the through-flow area of each outlet member for said small fraction flow would be small enough, in order to provide counter pressures in the hydrocyclones at the outlet members for small frac ⁇ tion flow.
  • a problem in this connection is that sufficiently small such through-flow areas would consi ⁇ derably increase the risk of clogging said outlet mem- bers.
  • each hydrocyclone group should include at least eight hydrocyclones, in order to create a counter pressure high enough in each sub-cham ⁇ ber. That many hydrocyclones in each group is not prac ⁇ tical with regard to the manufacture of the hydrocyclone plant. The most suitable number of hydrocyclones in each group has proved to be as few as three hydrocyclones.
  • the object of the present invention is to improve the kind of hydrocyclone plant having grouped hydrocyclones, so that the individual hydrocyclones can be operated substantially uniformly, clogging problems are avoided and each hydrocyclone group can include only a few hydrocyclones.
  • This object is obtained by a hydrocyclone plant of the kind initially described, which mainly is characterized in that the first outlet members of each hydrocyclone group are adapted to direct said relatively small flow of said first fraction into the associate sub-chamber, such that a vortex of the first fraction is generated in the sub-chamber during operation.
  • Said vortex creates an increased counter pressure in the sub-chamber, as compa ⁇ red to known hydrocyclone plant of this kind, in which each sub-chamber merely collects said first fraction from the first outlet members, without any vortex being created in the sub-chamber.
  • said increased counter pressure in each sub-chamber reduces the requi ⁇ red number of hydrocyclones in each group of hydrocyclo- nes.
  • each sub-chamber is cylindrical and said first outlet members are adapted to direct said relatively small flow of said first fraction of the liquid mixture substanti ⁇ ally tangentially into the cylindrical sub-chambers.
  • connection passage at each hydrocyclone group is preferably adapted to conduct said first fraction cen- trally from the cylindrical sub-chamber.
  • Each first outlet member of each hydrocyclone group suitably forms a through flow area which is at most as large as the through flow area of the associated connec- tion passage, whereby particles which are able to pass through each outlet member also can pass through the connection passage.
  • figure 1 schematically shows a part sectional view of a hydrocyclone plant according to the invention
  • figure 2 shows a section along the line II-II in figure 1
  • figure 3 shows a section along the line III-III in figure 1
  • figure 4 shows an axial section through a hydrocyclone group
  • figure 5 shows a detail of the axial section according to figure 4
  • figure 6 shows a sectional view along the line VI-VI in figure 5.
  • the hydrocyclone plant shown in the figures is suited for cleaning fiber pulp suspensions and comprises a number of elongated hydrocyclones 1, which are arranged in groups of three hydrocyclones.
  • Each hydrocyclone 1 has a cylindrical chamber 2 with an inlet member 3 directed tangentially into the chamber 2 for a liquid mixture to be separated, a central accept outlet member 4 for a created light fraction containing fibres, and a conical chamber 5 with a reject outlet member 6 at the apex of the conical chamber 5 for a created heavy frac- tion containing heavy impurities.
  • Three cylindrical vertical walls, an inner wall 7, an outer wall 8, and an intermediate wall 9 are arranged coaxially with each other and define a main reject chamber 10 between the inner wall 7 and the intermediate wall 9, and an accept chamber 12 between the intermediate wall 9 and the outer wall 8.
  • the walls 7-9 are provided with bottom walls 13- 15, which have a main outlet member 16 for heavy frac ⁇ tion, a main outlet member 17 for light fraction and a main inlet member 18 for the liquid mixture to be sepa- rated, respectively.
  • the groups of hydrocyclones 1 extend substantially horizontally through the inlet chamber 11 towards the centre of the cylindrical inner wall 7 and are evenly distributed around the main reject chamber 10 on several levels along the cylindrical walls 7-9.
  • the inlet mem ⁇ bers 3, the reject outlet members 6 and the accept outlet members 4 of the hydrocyclones 1 are connected to the inlet chamber 12.
  • Each group of hydrocyclones 1 is made in one single piece (figures 3 and 4), which is releasable from the hydrocyclone plant via a hole, which is arranged in the outer wall 8 in front of said piece and which normally is closed by a lid 19.
  • Each hydrocyclone group is provided with a substantially cylindrical sub-chamber 20, to which the three reject outlet members 6 of the hydrocyclone group are connected (fig 4).
  • Each sub-chamber 20 communicates with the main reject chamber 10 through a cylindrical connection passage 21, which is coaxial to the sub-chamber 20.
  • Each reject outlet member 6 forms a cylindrical bore 22, which is parallel to its associated cylindrical sub- chamber 20, and an arcuate passage 23 extending late- rally from the bore 22 (Figs 5 and 6).
  • the arcuate passage 23 has a concave wall surface 24, which extends tangentially from the cylindrical bore 22 and tangenti- ally to the cylindrical sub-chamber 20.
  • Each inlet member 3 of each hydrocyclone group is adapted to supply the liquid mixture in a direction into the inlet chamber 11, such that the flow of heavy fraction in the vortex created in the bore 22 of the reject outlet member 6 leaves the bore 22 along the concave wall surface 24 and creates a vortex 25 in the sub-chamber 20, as indicated by arrows in fig 6.
  • each group of hydrocyclones 1 the cylindrical cham ⁇ bers 2 extend in parallel with each other, whereas the centre axes of the conical chambers 5 converge in direc- tion towards the apices of the hydrocyclones.
  • the centre axis of the cylindrical cham ⁇ ber 2 and the centre axis of the conical chamber 5 form an angle a to one another, such that in an axial section through the hydrocyclone 1 the wall of the chambers 2,5 coincide with a straight line 22 (fig 4).
  • the liquid mixture to be separated is pumped to the inlet chamber 11 via the main inlet member 18.
  • the liquid mixture flows between the groups of hydrocyclones to the individual hydrocyclones 1 and enters into these via the inlet members 3.
  • the liquid mixture is separated into a light fraction and a heavy fraction, which is discharged via the reject outlet members 6, the sub-chambers 20 and the connection passages 21 to the main reject chamber 10, from which the heavy fraction is discharged from the hydrocyclone plant via the main outlet member 16.
  • Said light fraction is discharged via the accept outlet members 4 and is collected in the accept chamber 12, from which the light fraction is discharged from the hydrocyclone plant via the main outlet member 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cyclones (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Installation à hydrocyclones composée de plusieurs hydrocyclones (1) disposés en groupes, et d'une chambre principale (10) destinée à recevoir une fraction d'un mélange liquide séparé provenant de la totalité des hydrocyclones. Chaque groupe d'hydrocyclones comprend une sous-chambre (20) recevant ladite fraction provenant du groupe, chaque sous-chambre étant reliée à la chambre principale. Selon cette invention, ladite fraction est dirigée dans chaque sous-chambre, de sorte qu'un tourbillon de la fraction est produit dans la sous-chambre, lequel permet de créer une plus forte contre-pression dans cette dernière.
PCT/SE1991/000804 1990-11-26 1991-11-26 Installation a hydrocyclones Ceased WO1992009372A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003745A SE9003745D0 (sv) 1990-11-26 1990-11-26 Hydrocyklonanlaeggning
SE9003745-8 1990-11-26

Publications (1)

Publication Number Publication Date
WO1992009372A1 true WO1992009372A1 (fr) 1992-06-11

Family

ID=20381000

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000804 Ceased WO1992009372A1 (fr) 1990-11-26 1991-11-26 Installation a hydrocyclones

Country Status (2)

Country Link
SE (1) SE9003745D0 (fr)
WO (1) WO1992009372A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828346C (de) * 1947-04-11 1952-01-17 Alphonse Chaix Sarl Verfahren und Vorrichtung zum Reinigen heterogener fluessiger Gemische, insbesondere von Papierbrei
DE1058470B (de) * 1956-01-07 1959-06-04 Dorr Oliver Inc Mehrfachhydrozyklon

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828346C (de) * 1947-04-11 1952-01-17 Alphonse Chaix Sarl Verfahren und Vorrichtung zum Reinigen heterogener fluessiger Gemische, insbesondere von Papierbrei
DE1058470B (de) * 1956-01-07 1959-06-04 Dorr Oliver Inc Mehrfachhydrozyklon

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT No. 086 68 C/05; & SU,A,652 976, publ. week 8005. *

Also Published As

Publication number Publication date
SE9003745D0 (sv) 1990-11-26

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