US20050066637A1 - Device for the transformation of gas/liquid flow to laminar or stratified flow - Google Patents

Device for the transformation of gas/liquid flow to laminar or stratified flow Download PDF

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Publication number
US20050066637A1
US20050066637A1 US10/500,724 US50072404A US2005066637A1 US 20050066637 A1 US20050066637 A1 US 20050066637A1 US 50072404 A US50072404 A US 50072404A US 2005066637 A1 US2005066637 A1 US 2005066637A1
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United States
Prior art keywords
pipe
gas
flow
liquid
stratified
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Abandoned
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US10/500,724
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Per Gramme
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Norsk Hydro ASA
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Individual
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Assigned to NORSK HYDRO ASA reassignment NORSK HYDRO ASA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRAMME, PER
Publication of US20050066637A1 publication Critical patent/US20050066637A1/en
Priority to US12/153,005 priority Critical patent/US7559975B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • 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
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct

Definitions

  • the present invention concerns a device in connection with pipes for the transformation of dispersed liquid/gas flow into laminar or stratified flow. More precisely, the present invention concerns a device that is designed to break down drops of liquid in a gas flow, in particular a gas flow in a pipe or a pipe separator.
  • the prior art contains the use of so-called drop traps for the separation of drops of liquid from a gas flow, but such drop traps consist of separate devices connected to the transport pipe and have external dimensions that extend far beyond the diameter of the transport pipe.
  • Such a drop trap has a relatively expensive design and cannot be used in contexts in which there is a lack of space or where it is required that the diameter of the transport pipe for the gas/liquid transported cannot be exceeded by much.
  • the present invention is characterised in that a first set of stationary guide blades is arranged in the transport pipe.
  • the guide blades are designed to rotate the liquid/gas flow.
  • the transport pipe is connected to a second pipe with the same or a different diameter.
  • a second set of blades or a device that is designed to stop the rotation of the gas is arranged in the transition between the transport pipe and the second pipe so that the natural flow pattern of the gas/liquid becomes stratified over a predefined distance, as defined in the attached claim 1 .
  • a set of stationary guide blades 6 is arranged in the pipe 1 for transport of liquid and gas.
  • the guide blades are designed to rotate the dispersed liquid/gas flow.
  • the transport pipe 1 is connected to a pipe 2 with a larger diameter.
  • a second set of guide blades 8 or another suitable device that is designed to stop the rotation of the gas flow is arranged in the transition between the pipe 1 and the pipe 2 with a larger diameter.
  • the solution works as follows. Gas with a high gas/liquid ratio flows in the pipe 1 towards the guide blades 6 .
  • the guide blades cause the gas to rotate so that the drops are slung towards the pipe wall on account of centrifugal force, partially at the end of the blades 6 and in the area 7 of the pipe towards the second set of blades 8 .
  • a film of liquid is thus produced on the pipe in the area 7 with a flow direction towards the second set of blades 8 .
  • the gas is thus cleared of drops of liquid but will continue to rotate until it meets the blades 8 , which have the opposite guide direction to the first set of blades 6 .
  • the rotation of the gas is stopped here, after which the liquid will flow towards the lower part of the pipe on account of gravitational force, while the gas will flow into the upper part of the pipe, thus establishing a stratified gas/liquid flow.
  • a decisive precondition for achieving stratified flow is that the diameter of the pipe 3 is large enough to prevent redispersion being initiated and to ensure that the natural flow pattern remains stratified.
  • the ratio between the diameter of the transport pipe 1 and the diameter of the pipe with a larger diameter 2 will depend on the flow speed, the gas/liquid ratio, the viscosity of the liquid and the density of the liquid.
  • the present invention is not limited to the embodiment shown in the attached drawing and described above. Therefore, instead of the second set of guide blades 8 , it is possible to use another device that stops the gas rotation after the guide blades 6 .
  • a vertical or horizontal perforated plate arranged in the transition part between the transport pipe 1 and the pipe with the larger diameter 2 may be used. Moreover, the perforated plate may be arranged at an angle in relation to the longitudinal direction of the pipe with a direction that is the opposite of the guide direction of the blades 6 .
  • the above description concerns a solution in which the second pipe has a larger diameter
  • this requires, as stated above, that the flow speed of the gas after drop separation does not cause the liquid to be redispersed. Otherwise it will be possible to use a constriction in the pipe in the form of a venturi.
  • the first set of guide blades 6 should then be arranged at the inlet of the venturi so that they extend from a place in front of the inlet of the venturi and a little way into it.
  • venturi means that the speed is increased (through the venturi) so that-a more intensive rotational field is established.
  • the second set of blades 8 that stops the rotation is arranged at the outlet of the venturi, where the speed increases again. This results in equivalent liquid separation and stratified gas/liquid flow as in the example shown in the figure.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Pipe Accessories (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Pipeline Systems (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Colloid Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

A device in connection with a pipe (1) for transformation of dispersed gas/liquid flow into laminar stratified flow. The solution involves a first set of stationary guide blades (6) being arranged in the pipe (1) and being designed to rotate the liquid/gas flow. The pipe (1) is, in turn, connected to a second pipe (2) with the same or a different diameter and, in the transition between the pipe (1) and the second pipe (2), there is a second set of blades or a device (8) that is designed to stop the rotation of the gas. The natural flow pattern of the gas/liquid in the second pipe (2) then becomes stratified over a predefined distance.

Description

  • The present invention concerns a device in connection with pipes for the transformation of dispersed liquid/gas flow into laminar or stratified flow. More precisely, the present invention concerns a device that is designed to break down drops of liquid in a gas flow, in particular a gas flow in a pipe or a pipe separator.
  • In many situations in connection with the flow of gas in a pipe, there will also be drops of liquid dispersed in the gas flow. In particular in connection with the production of oil and gas or in installations for processing, for example the separation of oil and gas, there will be flow conditions in which large quantities of liquid exist as drops dispersed in the gas. For several reasons, it is desirable to break down the drops of liquid in such gas flows in order to achieve pure flows of gas/liquid.
  • The prior art contains the use of so-called drop traps for the separation of drops of liquid from a gas flow, but such drop traps consist of separate devices connected to the transport pipe and have external dimensions that extend far beyond the diameter of the transport pipe. Such a drop trap has a relatively expensive design and cannot be used in contexts in which there is a lack of space or where it is required that the diameter of the transport pipe for the gas/liquid transported cannot be exceeded by much.
  • The applicant having filed the present patent application has previously filed patent applications, including PCT/NO98/00085, concerning the separation of fluids in pipes or wells, for example sea bed and downhole separation of oil, water and gas. An essential precondition for achieving separation in a pipe or well is that the flow is stratified. In connection with the extraction of oil and gas, there may be dispersed liquid/gas flow in many situations where downhole pipe separators are used.
  • With the present invention, a device has been produced that transforms dispersed liquid/gas flow into stratified flow in a simple fashion over a very short distance. The solution is very effective and inexpensive and can easily be adapted to pipe separators as described in the above application.
  • The present invention is characterised in that a first set of stationary guide blades is arranged in the transport pipe. The guide blades are designed to rotate the liquid/gas flow. The transport pipe is connected to a second pipe with the same or a different diameter. A second set of blades or a device that is designed to stop the rotation of the gas is arranged in the transition between the transport pipe and the second pipe so that the natural flow pattern of the gas/liquid becomes stratified over a predefined distance, as defined in the attached claim 1.
  • The dependent claims 2-3 define advantageous features of the present invention.
  • The present invention will be described in further detail in the following by means of examples and with reference to the attached figure, which shows a diagram of a transport pipe 1 with a solution in accordance with the present invention.
  • The special feature of the solution is that a set of stationary guide blades 6 is arranged in the pipe 1 for transport of liquid and gas. The guide blades are designed to rotate the dispersed liquid/gas flow. In turn, the transport pipe 1 is connected to a pipe 2 with a larger diameter. A second set of guide blades 8 or another suitable device that is designed to stop the rotation of the gas flow is arranged in the transition between the pipe 1 and the pipe 2 with a larger diameter.
  • The solution works as follows. Gas with a high gas/liquid ratio flows in the pipe 1 towards the guide blades 6. The guide blades cause the gas to rotate so that the drops are slung towards the pipe wall on account of centrifugal force, partially at the end of the blades 6 and in the area 7 of the pipe towards the second set of blades 8. A film of liquid is thus produced on the pipe in the area 7 with a flow direction towards the second set of blades 8. The gas is thus cleared of drops of liquid but will continue to rotate until it meets the blades 8, which have the opposite guide direction to the first set of blades 6. The rotation of the gas is stopped here, after which the liquid will flow towards the lower part of the pipe on account of gravitational force, while the gas will flow into the upper part of the pipe, thus establishing a stratified gas/liquid flow.
  • A decisive precondition for achieving stratified flow, however, is that the diameter of the pipe 3 is large enough to prevent redispersion being initiated and to ensure that the natural flow pattern remains stratified.
  • Moreover, the ratio between the diameter of the transport pipe 1 and the diameter of the pipe with a larger diameter 2, as well as the length of the guide blades and their angle to the pipe, will depend on the flow speed, the gas/liquid ratio, the viscosity of the liquid and the density of the liquid.
  • It should be noted that the present invention, as it is defined in the claims, is not limited to the embodiment shown in the attached drawing and described above. Therefore, instead of the second set of guide blades 8, it is possible to use another device that stops the gas rotation after the guide blades 6. A vertical or horizontal perforated plate arranged in the transition part between the transport pipe 1 and the pipe with the larger diameter 2 may be used. Moreover, the perforated plate may be arranged at an angle in relation to the longitudinal direction of the pipe with a direction that is the opposite of the guide direction of the blades 6.
  • Although the above description concerns a solution in which the second pipe has a larger diameter, it is also possible, in given flow situations, depending on the flow speed and drop density, to use solutions in which the second pipe has a larger or smaller diameter than the first pipe (the transport pipe). However, this requires, as stated above, that the flow speed of the gas after drop separation does not cause the liquid to be redispersed. Otherwise it will be possible to use a constriction in the pipe in the form of a venturi. The first set of guide blades 6 should then be arranged at the inlet of the venturi so that they extend from a place in front of the inlet of the venturi and a little way into it.
  • The use of a venturi means that the speed is increased (through the venturi) so that-a more intensive rotational field is established. The second set of blades 8 that stops the rotation is arranged at the outlet of the venturi, where the speed increases again. This results in equivalent liquid separation and stratified gas/liquid flow as in the example shown in the figure.

Claims (8)

1-5. (Cancelled)
6. A device in connection with a pipe for transformation of dispersed liquid/gas flow into stratified flow, wherein a first set of stationary guide blades is arranged in the pipe and is designed to rotate the liquid/gas flow, the pipe is connected to a second pipe with the same or a different diameter and, in a transition between the pipe and the second pipe, there is a second set of blades or a device that is designed to stop the rotation of the gas so that the natural flow pattern of the gas/liquid in the second pipe becomes stratified over a predefined distance.
7. A device in accordance with claim 6, wherein the second pipe has a larger diameter than the first pipe.
8. A device in accordance with claim 6, wherein a venturi is arranged in the pipe, and the first set of guide blades is arranged at the inlet of the venturi, while the second set of guide blades is arranged at the outlet of the venturi.
9. A device in accordance with claim 6, wherein the second device is a perforated plate.
10. A device in accordance with claim 9, wherein the perforated plate is arranged at an angle in relation to the longitudinal direction of the pipe.
11. A device in accordance with claim 7, wherein the second device is a perforated plate.
12. A device in accordance with claim 8, wherein the second device is a perforated plate.
US10/500,724 2002-02-08 2003-01-31 Device for the transformation of gas/liquid flow to laminar or stratified flow Abandoned US20050066637A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/153,005 US7559975B2 (en) 2002-02-08 2008-05-12 Process for transforming gas/liquid flow into laminar or stratified flow

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20020619 2002-02-08
NO20020619A NO318636B1 (en) 2002-02-08 2002-02-08 Device for transformation of gas / liquid stream into layered stream
PCT/NO2003/000029 WO2003066195A1 (en) 2002-02-08 2003-01-31 Device for the transformation of gas/liquid flow to laminar or stratified flow

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US10/500,724 Abandoned US20050066637A1 (en) 2002-02-08 2003-01-31 Device for the transformation of gas/liquid flow to laminar or stratified flow
US12/153,005 Expired - Lifetime US7559975B2 (en) 2002-02-08 2008-05-12 Process for transforming gas/liquid flow into laminar or stratified flow

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US (2) US20050066637A1 (en)
EP (1) EP1476242B1 (en)
CN (1) CN1308056C (en)
AT (1) ATE347432T1 (en)
AU (1) AU2003206266B2 (en)
BR (1) BR0306739B1 (en)
CA (1) CA2470719C (en)
DE (1) DE60310201T2 (en)
MX (1) MXPA04007613A (en)
NO (1) NO318636B1 (en)
RU (1) RU2314859C2 (en)
WO (1) WO2003066195A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120180661A1 (en) * 2009-06-26 2012-07-19 Eni S.P.A. Compact inertial gas-liquid separation system
US11813581B2 (en) 2017-07-14 2023-11-14 3M Innovative Properties Company Method and adapter for conveying plural liquid streams

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO323087B1 (en) 2003-07-09 2006-12-27 Norsk Hydro As Method and apparatus for separating a fluid, especially oil, gas and water
US10408026B2 (en) 2013-08-23 2019-09-10 Chevron U.S.A. Inc. System, apparatus, and method for well deliquification

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US2506298A (en) * 1947-08-09 1950-05-02 American Blower Corp Fluid stream directing means
US2806551A (en) * 1951-10-16 1957-09-17 Oswald X Heinrich Centrifugal dust collector with laminar gas flow
US2784803A (en) * 1954-04-22 1957-03-12 Exxon Research Engineering Co Cyclone separator dipleg seal
US3258895A (en) * 1962-10-19 1966-07-05 Joy Mfg Co Device for separating solids from a gaseous medium
US3788282A (en) * 1968-06-27 1974-01-29 Babcock & Wilcox Co Vapor-liquid separator
US4001448A (en) * 1973-05-14 1977-01-04 General Foods Corporation Beverage mix and method of manufacturing same
US4098582A (en) * 1975-11-14 1978-07-04 Masahiro Takeda Method of accelerating contact reactions in fluids and apparatus therefor
US4131439A (en) * 1976-10-27 1978-12-26 Hoelter H Device for the dedusting of dust-containing gases
US4808007A (en) * 1982-05-13 1989-02-28 Komax Systems, Inc. Dual viscosity mixer
US4629481A (en) * 1985-01-18 1986-12-16 Westinghouse Electric Corp. Low pressure drop modular centrifugal moisture separator
US4824614A (en) * 1987-04-09 1989-04-25 Santa Fe Energy Company Device for uniformly distributing a two-phase fluid
US4886523A (en) * 1987-05-11 1989-12-12 Maldague Pierre E Process and apparatus for aerodynamic separation of components of a gaseous stream
US6419386B1 (en) * 1990-08-23 2002-07-16 Sulzer Brothers Limited Static laminar mixing device
US6428200B1 (en) * 1990-08-23 2002-08-06 Sulzer Brothers Limited Static laminar mixing method
US5813762A (en) * 1996-04-12 1998-09-29 Sulzer Chemtech Ag Mixer tube for low viscosity fluids
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US7163626B1 (en) * 1998-11-04 2007-01-16 Spark Technologies And Innovations N.V. Device for treating a gas/liquid mixture
US6576031B1 (en) * 1999-01-19 2003-06-10 Wiser Oy Droplet separator including a flow tube, and a droplet separation tube surrounding a portion of the flow tube
US6604850B1 (en) * 1999-04-19 2003-08-12 Sulzer Chemtech Ag Vortex static mixer
US6630014B1 (en) * 1999-07-12 2003-10-07 Kadant Black Clawson Inc. Mist eliminator
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US7030612B1 (en) * 2004-01-13 2006-04-18 Fonar Corporation Body rest for magnetic resonance imaging

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120180661A1 (en) * 2009-06-26 2012-07-19 Eni S.P.A. Compact inertial gas-liquid separation system
US8808431B2 (en) * 2009-06-26 2014-08-19 Eni S.P.A. Compact inertial gas-liquid separation system
US11813581B2 (en) 2017-07-14 2023-11-14 3M Innovative Properties Company Method and adapter for conveying plural liquid streams

Also Published As

Publication number Publication date
RU2314859C2 (en) 2008-01-20
AU2003206266B2 (en) 2008-07-17
CA2470719A1 (en) 2003-08-14
BR0306739B1 (en) 2011-12-27
CN1612774A (en) 2005-05-04
NO20020619L (en) 2003-08-11
ATE347432T1 (en) 2006-12-15
US7559975B2 (en) 2009-07-14
CA2470719C (en) 2010-10-26
NO20020619D0 (en) 2002-02-08
AU2003206266A1 (en) 2003-09-02
CN1308056C (en) 2007-04-04
BR0306739A (en) 2004-12-28
EP1476242B1 (en) 2006-12-06
RU2004126951A (en) 2005-05-10
EP1476242A1 (en) 2004-11-17
DE60310201T2 (en) 2007-09-13
DE60310201D1 (en) 2007-01-18
US20080216656A1 (en) 2008-09-11
NO318636B1 (en) 2005-04-18
WO2003066195A1 (en) 2003-08-14
MXPA04007613A (en) 2004-11-10

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Effective date: 20040629

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