EP0843596A1 - Hydrocyclone - Google Patents
HydrocycloneInfo
- 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- Withdrawn
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.
Abstract
A liquid/liquid hydrocyclone in which the end wall at the inlet end is helical and is arranged to impart to the mixture through the inlet (2) an axial component of momentum in a direction towards the opposite end of the hydrocyclone.
Description
HYDROCYCLONE
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.
According to the present invention, in a hydrocyclone of the kind described, 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.
This arrangement allows the capacity of a hydrocylone to be increased with minimal change in the separation efficiency. Thus, in any application, the size or number of the hydrocyclones required can be reduced. By imparting axial momentum to the mixture towards the opposite end of the hydrocyclone, short circuiting between the inlet and overflow outlet can be reduced. Preferably, 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. With this configuration, when multiple inlets are used, the flow through one inlet can be directed past the flow through the next inlet in the direction of swirl of the mixture, so that the turbulence at the inlet end can be reduced.
If 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.
Two examples of hydrocyclones constructed in accordance with the present invention will now be described with reference to the accompanying drawings, in which:-
Fig. 1 shows a section of a hydrocyclone having a single inlet; and
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. Thus, 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. In normal operation, 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. As can be seen from the dashed line representing the flow path in Fig. 1, 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.
Claims
1. A hydrocyclone for separating a liquid mixture into a more dense and a less dense component, the hydrocyclone comprising an elongate separating chamber (1) having a wall profile of the kind suitable for separating two liquids, at least one inlet (2) 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 (5) of the chamber, an underflow outlet (3) at the opposite end of the chamber for removal of the more dense component, and an overflow outlet (4) extending through but not projecting from an end wall at the inlet end of the chamber for removal of the less dense component; characterised in that the end wall is inclined so that as the mixture from the or each inlet (2) 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.
2. A hydrocyclone according to claim 1, wherein the end wall is substantially in the form of a helix (6) which gradually extends axially towards the underflow outlet end (3) as the circumferential distance away from the or a respective inlet (2) in the direction of swirl of the mixture increases and terminates in a step (7) adjacent to the inlet or the next inlet in the direction of swirl of the mixture.
3. A hydrocyclone according to claim 1 or claim 2, wherein there are a plurality of inlets (2) .
4. A hydrocyclone according to any one of the preceding claims, wherein the wall profile of the separating chamber (1) between the two ends is of the kind suitable for separating oil and water.
5. A hydrocyclone according to any one of the preceding claims, wherein the ratio of the diameter of the overflow outlet (4) to the diameter of the separating chamber (1) adjacent to the inlet (2) is less than or equal to 0.15, both diameters being measured in a plane perpendicular to the longitudinal axis (5) .
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 (en) | 1995-08-10 | 1996-08-08 | Hydrocyclone |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0843596A1 true EP0843596A1 (en) | 1998-05-27 |
Family
ID=10779029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96927138A Withdrawn EP0843596A1 (en) | 1995-08-10 | 1996-08-08 | Hydrocyclone |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0843596A1 (en) |
GB (1) | GB9516381D0 (en) |
NO (1) | NO980558L (en) |
WO (1) | WO1997005956A1 (en) |
Families Citing this family (3)
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 (en) | 2007-01-11 | 2008-07-14 | Schinfa Engineering | Device and method for separating a flowing medium mixture with a stationary cyclone. |
DE102012018783A1 (en) * | 2012-09-22 | 2014-03-27 | Hydac Process Technology Gmbh | hydrocyclone |
Family Cites Families (4)
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 |
-
1995
- 1995-08-10 GB GBGB9516381.2A patent/GB9516381D0/en active Pending
-
1996
- 1996-08-08 EP EP96927138A patent/EP0843596A1/en not_active Withdrawn
- 1996-08-08 WO PCT/GB1996/001946 patent/WO1997005956A1/en not_active Application Discontinuation
-
1998
- 1998-02-09 NO NO980558A patent/NO980558L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9705956A1 * |
Also Published As
Publication number | Publication date |
---|---|
NO980558L (en) | 1998-04-08 |
NO980558D0 (en) | 1998-02-09 |
WO1997005956A1 (en) | 1997-02-20 |
GB9516381D0 (en) | 1995-10-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4576724A (en) | Cyclone separator | |
US6540917B1 (en) | Cyclonic inertial fluid cleaning apparatus | |
EP1028811A1 (en) | Cyclone separator | |
EP0368849B1 (en) | Cyclone separator | |
US3807142A (en) | Method and apparatus for high efficiency removal of gases and particles from paper pulp suspensions and other fluids | |
AU8333287A (en) | Cyclone separator | |
US5108608A (en) | Cyclone separator with multiple outlets and recycling line means | |
US5225082A (en) | Hydrocyclone with finely tapered tail section | |
EP1204482B1 (en) | Hydrocyclone | |
EP0360360B1 (en) | Swirl tube separator | |
US5049277A (en) | Cyclone separator | |
EP0295251A4 (en) | Cyclone separator. | |
WO1997005956A1 (en) | Hydrocyclone | |
CN110831700B (en) | Swirler with guide vanes | |
CA2021478A1 (en) | Hydrocyclone | |
EP0879092A1 (en) | Hydrocyclone separator | |
US5163986A (en) | Vortex chamber separator | |
EP0203065B1 (en) | Cyclone separator | |
AU598505B2 (en) | Cyclone separator | |
WO1999043439A1 (en) | Device and method for the separation of fluids | |
RU2684078C1 (en) | Multistage hydrocyclone unit | |
EP0480921A4 (en) | Cyclone separator | |
EP0240486B1 (en) | Cyclone separator | |
SU850160A1 (en) | Apparatus for separating suspended particles of liquid from gas flow | |
SU982742A1 (en) | Centrifugal separator |
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 |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19980209 |
|
AK | Designated contracting states |
Kind code of ref document: A1 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 |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19990721 |