EP0843596A1 - Hydrocyclone - Google Patents

Hydrocyclone

Info

Publication number
EP0843596A1
EP0843596A1 EP96927138A EP96927138A EP0843596A1 EP 0843596 A1 EP0843596 A1 EP 0843596A1 EP 96927138 A EP96927138 A EP 96927138A EP 96927138 A EP96927138 A EP 96927138A EP 0843596 A1 EP0843596 A1 EP 0843596A1
Authority
EP
European Patent Office
Prior art keywords
inlet
chamber
mixture
hydrocyclone
separating
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.)
Withdrawn
Application number
EP96927138A
Other languages
German (de)
English (en)
Inventor
James Edward Stolhand
Elwyn Shimoda
Robert Edison Denson
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 Ltd
Original Assignee
Baker Hughes 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
Application filed by Baker Hughes Ltd filed Critical Baker Hughes Ltd
Publication of EP0843596A1 publication Critical patent/EP0843596A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0217—Separation of non-miscible liquids by centrifugal force

Definitions

  • the present invention relates to a hydrocyclone for separating a liquid mixture into a more dense and a less dense component
  • the hydrocyclone comprising an elongate separating chamber having a wall profile of the kind suitable for separating two liquids, at least one inlet in the sidewall of the chamber adjacent to one end through which inlet or inlets the mixture enters the chamber, the or each inlet being arranged so that the mixture swirls about the longitudinal axis of the chamber, an underflow outlet at the opposite end of the chamber for removal of the more dense component, and an overflow outlet extending through but not projecting from an end wall at the inlet end of the chamber for removal of the less dense component.
  • Such a hydrocyclone will hereinafter be referred to as of the kind described. Examples of such a hydrocyclone can be found in GB 2248198, GB 2263077 and GB 2263245.
  • the present invention relates to a modification of a hydrocyclone of the kind described in order to increase its capacity.
  • the end wall is inclined so that as the mixture from the or each inlet swirls about the axis of the chamber, the end wall imparts to the mixture an axial component of momentum in a direction towards the opposite end.
  • the size or number of the hydrocyclones required can be reduced.
  • the end wall is substantially in the form of a helix which gradually extends axially towards the underflow outlet end as the circumferential distance away from the or a respective inlet in the direction of swirl of the mixture increases and terminates in a step adjacent to the inlet or the next inlet in the direction of swirl of the mixture.
  • the hydrocyclone is configured to remove oil from an oil/water mixture containing predominantly oil, it is preferable for the ratio of the diameter of the overflow outlet to the diameter of the separating chamber adjacent to the inlet to be less than or equal to 0.15, both diameters being measured in a plane perpendicular to the longitudinal axis.
  • Fig. 1 shows a section of a hydrocyclone having a single inlet
  • Fig. 2 shows the profile of the inlet end wall of a hydrocyclone having two inlets.
  • the hydrocyclone shown in Fig. 1 is, in most respects, a standard de-oiling hydrocyclone.
  • the hydrocyclone has a separating chamber 1 which is provided at one end with a tangential or involute inlet 2, and at the opposite end with an underflow outlet 3, and gradually tapers from the inlet end to the underflow outlet end.
  • the end wall at the inlet end is provided with an overflow outlet 4.
  • the liquid mixture entering the separating chamber 1 through the inlet 2 swirls about the longitudinal axis 5 of the hydrocyclone causing centrifugal separation of the liquid mixture, so that a more dense component of the mixture flows out through the underflow outlet 3, while a less dense component flows out through the overflow outlet 4.
  • the end wall of the separator adjacent to the inlet 2 has an inclined surface 6 which has a substantially helical configuration.
  • the helix is of generally uniform pitch, so that it presents an inclined surface to the incoming mixture.
  • the inclined surface 6 terminates at a step 7.
  • the extent of the step is such that the mixture which has undergone one complete revolution within the separating chamber 1 is axially below the level of the inlet 2 , so that the two streams do not interfere with one another.
  • Fig. 2 illustrates the end wall of a hydrocyclone having two inlets through which flow enters in the direction of the two arrows in Fig. 2.
  • Each inlet is associated with a substantially helical surface 6'.
  • Each helical surface terminates in a step 1 ' , which ensures that the mixture entering through one inlet does not interfere with that entering through the next inlet.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fluid Mechanics (AREA)
  • Cyclones (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Cet hydrocyclone liquide/liquide dont la paroi d'extrémité, au niveau de l'extrémité d'entrée, est hélicoïdale, est conçu pour imprimer au mélange, à travers l'orifice (2) d'entrée, une constituante axiale d'une énergie cinétique qui soit dirigée vers l'extrémité opposée de l'hydrocyclone.
EP96927138A 1995-08-10 1996-08-08 Hydrocyclone Withdrawn EP0843596A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9516381 1995-08-10
GBGB9516381.2A GB9516381D0 (en) 1995-08-10 1995-08-10 Hydrocyclone
PCT/GB1996/001946 WO1997005956A1 (fr) 1995-08-10 1996-08-08 Hydrocyclone

Publications (1)

Publication Number Publication Date
EP0843596A1 true EP0843596A1 (fr) 1998-05-27

Family

ID=10779029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96927138A Withdrawn EP0843596A1 (fr) 1995-08-10 1996-08-08 Hydrocyclone

Country Status (4)

Country Link
EP (1) EP0843596A1 (fr)
GB (1) GB9516381D0 (fr)
NO (1) NO980558L (fr)
WO (1) WO1997005956A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2353236A (en) * 1999-08-17 2001-02-21 Baker Hughes Ltd Cyclone separator with multiple baffles of distinct pitch
NL2000429C2 (nl) 2007-01-11 2008-07-14 Schinfa Engineering Inrichting en werkwijze voor het met een stationaire cycloon separeren van een stromend mediummengsel.
DE102012018783A1 (de) * 2012-09-22 2014-03-27 Hydac Process Technology Gmbh Hydrozyklon

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288300A (en) * 1962-02-14 1966-11-29 Bauer Bros Co Centrifugal cleaner
US3494474A (en) * 1968-12-26 1970-02-10 Barnes Drill Co Hydrocyclone separator with vortex starter
GB8515264D0 (en) * 1985-06-17 1985-07-17 Colman D A Cyclone separator
US5110471A (en) * 1990-08-30 1992-05-05 Conoco Specialty Products Inc. High efficiency liquid/liquid hydrocyclone

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9705956A1 *

Also Published As

Publication number Publication date
GB9516381D0 (en) 1995-10-11
WO1997005956A1 (fr) 1997-02-20
NO980558D0 (no) 1998-02-09
NO980558L (no) 1998-04-08

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19980209

AK Designated contracting states

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Designated state(s): DE DK FR GB IT NL

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BAKER HUGHES LIMITED

17Q First examination report despatched

Effective date: 19990112

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19990721