WO2001050024A1 - Method and system for optimizing the performance of a rotodynamic multi-phase flow booster - Google Patents
Method and system for optimizing the performance of a rotodynamic multi-phase flow booster Download PDFInfo
- Publication number
- WO2001050024A1 WO2001050024A1 PCT/EP2000/013356 EP0013356W WO0150024A1 WO 2001050024 A1 WO2001050024 A1 WO 2001050024A1 EP 0013356 W EP0013356 W EP 0013356W WO 0150024 A1 WO0150024 A1 WO 0150024A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- booster
- flow
- rotor
- density
- blade
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0261—Surge control by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D31/00—Pumping liquids and elastic fluids at the same time
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention relates to a method and system for optimizing the performance of a rotodynamic multi-phase flow booster, such as a rotary pump or compressor for pumping a multi-phase gas/liquid mixture through a fluid transportation conduit.
- a rotodynamic multi-phase flow booster such as a rotary pump or compressor for pumping a multi-phase gas/liquid mixture through a fluid transportation conduit.
- UK patent 2215408 discloses a system for controlling the gas-liquid ratio in a pump, wherein the gas-liquid ratio is maintained at a substantially constant level by extracting liquid from the downstream end of the pump and feeding the extracted liquid back to the pump inlet if the measured gas/liquid ratio exceeds a predetermined level .
- a disadvantage of the known multi-phase boosters is that the pumping efficiency varies in response to the density of the fluid mixture passing through the booster. This variation can be particularly high in case gas and liquid slugs are passing alternatingly through the booster .
- US patent 3,568,771 discloses an electrical submersible oil well pump for lifting foamy crudes in which the rotary speed of the pump rotor (s) is varied as a function of the bulk density of the crude in the well bore.
- European patent application No. 0549439 discloses a multi-phase pump of which the speed of rotation is varied in response to variation of the gas/liquid ratio of the pumped multi-phase mixture.
- An object of the present invention is to provide a method and system for further optimizing the performance of a rotodynamic flow booster, such as a gas/liquid compressor, such that the pumping efficiency is maintained at its best efficiency point if the density of the fluid mixture passing through the pump varies.
- the mode of operation may suitably be selected such that if the fluid mixture density p varies either a) the mixture mass flow (Qm) passing through the booster is maintained at a substantially constant level; or b) the power consumption of the booster is maintained at a substantially constant level; or c) the pressure difference ( ⁇ p) between the outlet and the inlet of the booster is maintained at a substantially constant level.
- the booster is expected to continue to operate at its best efficiency point (BEP) as with varying fluid mixture density and compositions the impellers or screws of the rotor (s) of the booster continuously create favourable fluid flow conditions such as a dispersed mist flow in which liquid droplets are finely dispersed in the gas phase or a dispersed bubble flow in which gas bubbles are finely dispersed in the liquid phase.
- BEP best efficiency point
- the density and/or gas/liquid mass fraction of the multi-phase fluid mixture is measured by a gradio- venturi flowmeter or a wet gas tracer apparatus which is located in the conduit upstream of the flow booster.
- the invention also relates to a rotodynamic multiphase flow booster for use as a wet gas compressor and which is equipped with one or more rotor and/or stator parts having rotor and/or stator blades which are designed to transform liquid droplets which in use impinge upon the leading edges of the blades into a mist of smaller droplets which are and remain a finely dispersed mist in the gaseous phase.
- the invention relates to a rotor and/or stator blade suitable for use in such a wet compressor.
- the rotor blade comprises non-wettable sides, which are suitably coated with a polytetra- fluorethylene or PTFE (sold by E . I . du Pont de Nemours and Company under the trademark "TEFLON”) and a leading edge having a larger roughness than the sides.
- PTFE polytetra- fluorethylene or PTFE
- the leading edge of the blade (s) is covered by a random array of grains having a grainsize of at least about 50 microns, which grains are separated by distances which are on average less than twice the grainsize.
- leading edge of the blade (s) is provided with a series of riblets which have a square or triangular cross-sectional shape, which are substantially aligned with the direction of flow of the multi-phase fluid mixture and which have mutual spacings of at least 50 microns.
- a favourable mist flow of small liquid droplets which are finely dispersed in the gaseous phase will be maintained also if the wet gas has a high liquid content which also contributes to operation of the wet gas compressor at its best efficiency point (BEP) in circumstances that the gas has a high liquid content, which may exceed 10% of the volume of the wet gas mixture .
- BEP best efficiency point
- FIG. 1 schematically shows a multi-phase flow booster, wherein the rotary speed of the rotor (s) of the booster is varied in response to variations of the density of the fluid mixture passing through the booster;
- Fig. 2 shows a characteristic curve for operating the booster at its best efficiency point (BEP) .
- FIG. 1 there is shown a multi-phase fluid compressor 1 having a rotor 2 of which the rotor speed ⁇ is controlled by an angular velocity control unit 3.
- a fluid feed conduit 4 is connected to the inlet of the compressor 1 and a fluid discharge conduit 5 is connected to the outlet of the compressor 1.
- a fluid density meter 6 is connected to the fluid feed pipe 4 and transmits a signal which is representative of the measured fluid density p to the angular velocity control unit 3.
- the fluid density meter 6 may be a gradio venturi flowmeter which is described in US patents
- any other multi-phase flowmeter capable of measuring the fluid mixture density with cut-off frequency suitably chosen in-line with booster characteristics .
- These could include wet gas tracer methods for spot measurement under stable conditions; however, for on-line direct regulation a continuous measurement would be needed.
- Such a continuous measurement may detect fluctuations of the mixture density, for instance in slugging conditions, enabling direct speed control.
- Continuous measurement would be possible using either two separate ⁇ p flowmeters in series or one ⁇ p flowmeter calibrated for the specific conditions .
- the underlying operating principle for the multi- phase pump or compressor according to the invention is the assumption of well-mixed flow (effectively a flow of ideally mixed gas and liquid phases) . From fluid flow considerations the best efficiency point (BEP) is derived as a function of mixture density p and rotational speed ⁇ .
- the algorithm for speed regulation can support different modes of operation, including:
- ⁇ and p are non-dimensional rotational speed and mixture density, respectively;
- exponent n is selected in the range between -1/3 and -1, which depends on the mode of operation and
- f is a parameter that is uniquely determined by the geometry of the pump or compressor unit and the operating conditions. Its value at the actual operating conditions can be determined from regular performance data, for instance by fitting the observed performance of the actual pump or compressor to the performance predicted by the model.
- the rotor 2 is a propeller having two blades of which the sides are coated with polytetrafluorethylene (PTFE) and of which the leading edges have a larger roughness than the sides, e.g. by covering the leading edges with an array of e.g. sandgrains like an array used in sandpaper.
- PTFE polytetrafluorethylene
- the vertical axis represents the angular velocity ⁇ of the rotor and the horizontal axis the gas mass fraction m consult/ (m ⁇ _ + m practic) .
- the BEP curve shown in Fig. 2 is based on scaling theory which estimates the performance of a given pump or compressor under operating conditions. Because the BEP curve is derived from basic fluid mechanics principles, booster performance may be predicted for operating conditions within the parameter range for which experimental data is available. Outside this test range the theory allows to predict best efficiency performance of the pump or compressor with reasonable accuracy. In general compressor or pump performance is characterized with a number of dimensionless groups. For a wet gas compressor these groups can be characterized by assuming that the liquid phase is substantially incompressible and that the gaseous phase is (weakly) compressible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU31653/01A AU3165301A (en) | 1999-12-31 | 2000-12-29 | Method and system for optimizing the performance of a rotodynamic multi-phase flow booster |
EP00991279A EP1242745A1 (en) | 1999-12-31 | 2000-12-29 | Method and system for optimizing the performance of a rotodynamic multi-phase flow booster |
CA002395613A CA2395613C (en) | 1999-12-31 | 2000-12-29 | Method and system for optimizing the performance of a rotodynamic multi-phase flow booster |
US10/169,411 US6773235B2 (en) | 1999-12-31 | 2000-12-29 | Rotodynamic multi-phase flow booster pump |
NO20023143A NO20023143L (en) | 1999-12-31 | 2002-06-28 | Method and system for optimizing the performance of a rotor dynamic multiphase flow amplifier |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99204604.5 | 1999-12-31 | ||
EP99204604 | 1999-12-31 | ||
EP00200041.2 | 2000-01-05 | ||
EP00200041 | 2000-01-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001050024A1 true WO2001050024A1 (en) | 2001-07-12 |
Family
ID=26071713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/013356 WO2001050024A1 (en) | 1999-12-31 | 2000-12-29 | Method and system for optimizing the performance of a rotodynamic multi-phase flow booster |
Country Status (6)
Country | Link |
---|---|
US (1) | US6773235B2 (en) |
EP (1) | EP1242745A1 (en) |
AU (1) | AU3165301A (en) |
CA (1) | CA2395613C (en) |
NO (1) | NO20023143L (en) |
WO (1) | WO2001050024A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003019015A1 (en) * | 2001-08-21 | 2003-03-06 | Petroleo Brasileiro Sa-Petrobras | System and method of multiple-phase pumping |
WO2009029961A2 (en) * | 2007-09-01 | 2009-03-05 | John Wrathmall | Device for measuring the real-time performance of a pump |
EP2093429A1 (en) * | 2008-02-25 | 2009-08-26 | Siemens Aktiengesellschaft | Compressor unit |
WO2009131462A2 (en) * | 2008-04-21 | 2009-10-29 | Statoilhydro Asa | Gas compression system |
JP2015521708A (en) * | 2012-06-19 | 2015-07-30 | ヌオーヴォ ピニォーネ ソチエタ レスポンサビリタ リミタータNuovo Pignone S.R.L. | Wet gas compressor and method |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100011876A1 (en) * | 2008-07-16 | 2010-01-21 | General Electric Company | Control system and method to detect and minimize impact of slug events |
NO331264B1 (en) * | 2009-12-29 | 2011-11-14 | Aker Subsea As | System and method for controlling a submarine located compressor, and using an optical sensor thereto |
NO333438B1 (en) * | 2010-07-14 | 2013-06-03 | Statoil Asa | Method and apparatus for composition-based compressor control and performance monitoring. |
AU2016236054B2 (en) | 2015-03-26 | 2018-11-15 | Exxonmobil Upstream Research Company | Method of controlling a compressor system and compressor system |
CA2972928C (en) | 2015-03-26 | 2019-06-11 | Exxonmobil Upstream Research Company | Wet gas compression |
US20170030359A1 (en) * | 2015-07-31 | 2017-02-02 | Siemens Aktiencesellschaft | Batch change control for variable speed driven centrifugal pumps and pump systems |
US10208745B2 (en) | 2015-12-18 | 2019-02-19 | General Electric Company | System and method for controlling a fluid transport system |
Citations (6)
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US3568771A (en) * | 1969-04-17 | 1971-03-09 | Borg Warner | Method and apparatus for lifting foaming crude by a variable rpm submersible pump |
EP0549439A1 (en) | 1991-12-27 | 1993-06-30 | Institut Français du Pétrole | Method and apparatus for optimising the transport of multiphase flows by pumping |
FR2724200A1 (en) * | 1994-09-02 | 1996-03-08 | Technicatome | Deep underwater oil pumping station |
GB2298239A (en) * | 1995-02-21 | 1996-08-28 | Inst Francais Du Petrole | Regulating multiphase pump unit |
EP0917905A1 (en) * | 1997-11-19 | 1999-05-26 | Institut Francais Du Petrole | Device and process for the diphase compression of a soluble gas within a solvent |
FR2774135A1 (en) * | 1998-01-28 | 1999-07-30 | Inst Francais Du Petrole | Compression of a humid gas |
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GB2186981B (en) | 1986-02-21 | 1990-04-11 | Prad Res & Dev Nv | Measuring flow in a pipe |
GB2215408B (en) | 1988-02-29 | 1991-12-11 | Shell Int Research | Method and system for controlling the gas-liquid ratio in a pump |
FR2678022B1 (en) | 1991-06-18 | 1993-11-26 | Schlumberger Services Petroliers | METHOD FOR ANALYZING A DIPHASIC FLOW IN A HYDROCARBON WELL. |
US5193983A (en) * | 1991-08-05 | 1993-03-16 | Norm Pacific Automation Corp. | Axial-flow fan-blade with profiled guide fins |
GB9117859D0 (en) | 1991-08-19 | 1991-10-09 | Framo Dev Ltd | Pump or compressor unit |
DE4330226C1 (en) | 1993-09-07 | 1994-09-08 | Bornemann J H Gmbh & Co | Eccentric worm screw pump |
KR100227969B1 (en) * | 1994-10-20 | 1999-11-01 | 사카모토 시게토시 | Production system of electrolyzed water |
US5899844A (en) * | 1997-06-23 | 1999-05-04 | Eberle, Sr.; Louis C. | Method of controlling the density of the solids separated from a feed slurry in a separator |
-
2000
- 2000-12-29 US US10/169,411 patent/US6773235B2/en not_active Expired - Fee Related
- 2000-12-29 EP EP00991279A patent/EP1242745A1/en not_active Withdrawn
- 2000-12-29 CA CA002395613A patent/CA2395613C/en not_active Expired - Fee Related
- 2000-12-29 WO PCT/EP2000/013356 patent/WO2001050024A1/en active Application Filing
- 2000-12-29 AU AU31653/01A patent/AU3165301A/en not_active Abandoned
-
2002
- 2002-06-28 NO NO20023143A patent/NO20023143L/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US3568771A (en) * | 1969-04-17 | 1971-03-09 | Borg Warner | Method and apparatus for lifting foaming crude by a variable rpm submersible pump |
EP0549439A1 (en) | 1991-12-27 | 1993-06-30 | Institut Français du Pétrole | Method and apparatus for optimising the transport of multiphase flows by pumping |
FR2724200A1 (en) * | 1994-09-02 | 1996-03-08 | Technicatome | Deep underwater oil pumping station |
GB2298239A (en) * | 1995-02-21 | 1996-08-28 | Inst Francais Du Petrole | Regulating multiphase pump unit |
EP0917905A1 (en) * | 1997-11-19 | 1999-05-26 | Institut Francais Du Petrole | Device and process for the diphase compression of a soluble gas within a solvent |
FR2774135A1 (en) * | 1998-01-28 | 1999-07-30 | Inst Francais Du Petrole | Compression of a humid gas |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003019015A1 (en) * | 2001-08-21 | 2003-03-06 | Petroleo Brasileiro Sa-Petrobras | System and method of multiple-phase pumping |
GB2467088A (en) * | 2007-09-01 | 2010-07-21 | John Wrathmall | Device for measuring the real-time performance of a pump |
WO2009029961A2 (en) * | 2007-09-01 | 2009-03-05 | John Wrathmall | Device for measuring the real-time performance of a pump |
WO2009029961A3 (en) * | 2007-09-01 | 2009-05-14 | John Wrathmall | Device for measuring the real-time performance of a pump |
EP2093429A1 (en) * | 2008-02-25 | 2009-08-26 | Siemens Aktiengesellschaft | Compressor unit |
WO2009106465A1 (en) | 2008-02-25 | 2009-09-03 | Siemens Aktiengesellschaft | Compressor unit |
US8186968B2 (en) | 2008-02-25 | 2012-05-29 | Siemens Aktiengesellchaft | Compressor unit including a detection device to identify non-gaseous fluid in the suction line |
WO2009131462A3 (en) * | 2008-04-21 | 2010-01-07 | Statoilhydro Asa | Gas compression system |
WO2009131462A2 (en) * | 2008-04-21 | 2009-10-29 | Statoilhydro Asa | Gas compression system |
US9032987B2 (en) | 2008-04-21 | 2015-05-19 | Statoil Petroleum As | Gas compression system |
EA024584B1 (en) * | 2008-04-21 | 2016-10-31 | Статойл Петролеум Ас | Gas compression system |
US9784075B2 (en) | 2008-04-21 | 2017-10-10 | Statoil Petroleum As | Gas compression system |
US9784076B2 (en) | 2008-04-21 | 2017-10-10 | Statoil Petroleum As | Gas compression system |
JP2015521708A (en) * | 2012-06-19 | 2015-07-30 | ヌオーヴォ ピニォーネ ソチエタ レスポンサビリタ リミタータNuovo Pignone S.R.L. | Wet gas compressor and method |
Also Published As
Publication number | Publication date |
---|---|
US6773235B2 (en) | 2004-08-10 |
AU3165301A (en) | 2001-07-16 |
NO20023143L (en) | 2002-08-29 |
CA2395613A1 (en) | 2001-07-12 |
US20030010502A1 (en) | 2003-01-16 |
EP1242745A1 (en) | 2002-09-25 |
NO20023143D0 (en) | 2002-06-28 |
CA2395613C (en) | 2009-09-15 |
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