WO2008049752A1 - Système de mesure de débit et procédé de détermination d'un débit d'un liquide chargé en solides dans un conduit - Google Patents

Système de mesure de débit et procédé de détermination d'un débit d'un liquide chargé en solides dans un conduit Download PDF

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Publication number
WO2008049752A1
WO2008049752A1 PCT/EP2007/060958 EP2007060958W WO2008049752A1 WO 2008049752 A1 WO2008049752 A1 WO 2008049752A1 EP 2007060958 W EP2007060958 W EP 2007060958W WO 2008049752 A1 WO2008049752 A1 WO 2008049752A1
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WO
WIPO (PCT)
Prior art keywords
liquid
flow
density
measuring system
inlet
Prior art date
Application number
PCT/EP2007/060958
Other languages
German (de)
English (en)
Inventor
Alecsandru Nistor
Derek Real
Original Assignee
Endress+Hauser Gmbh+Co.Kg
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 Endress+Hauser Gmbh+Co.Kg filed Critical Endress+Hauser Gmbh+Co.Kg
Publication of WO2008049752A1 publication Critical patent/WO2008049752A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

Definitions

  • the invention relates to a flow measuring system and a method for determining a flow rate of a solids-laden liquid in a line.
  • the invention is therefore based on the object, a simpler
  • the inlet device is connected to a second line inlet piece to
  • Admixture of a second liquid Admixture of a second liquid.
  • Inlet piece is a T-shaped piece of pipe.
  • Inlet piece is a Y-shaped piece of pipe.
  • the inlet device comprises several opening into the pipeline inlet nozzles.
  • a device for improved mixing of the first and the second liquid is provided between the inlet device and the second density measuring point.
  • both density gauges are gamma-ray detectors which interact with a single radiation source.
  • the second liquid is a liquid of known density and is known with
  • a temperature measuring device is provided in the pipeline.
  • a temperature measuring device is provided in the pipeline.
  • Invention is in the second line connected to the inlet device
  • Flow meter is provided. The above object is also achieved by a method for
  • the liquid is mixed with a second liquid which opens into the pipeline via a feed device arranged between the two density measuring points; and - processing and processing of signals of the density measuring points and generate a desired flow corresponding to the output signal by means of electronics.
  • the second liquid is mixed via a connected to a second line inlet piece as an inlet device of the first liquid.
  • both density measuring points are detectors for gamma rays, which interact with a single radiation source.
  • the second liquid is a liquid of known density and is admixed with known volume flow to the first liquid.
  • an inlet of the second liquid is determined by a flowmeter.
  • a temperature of the first liquid is determined after admixing the second liquid by means of a temperature measuring device in the pipeline.
  • Fig. 1 is a schematic representation of a first embodiment of the flow measuring system according to the invention
  • Fig. 2 is a schematic representation of a second embodiment of the flow measuring system according to the invention.
  • Fig. 3 is a schematic representation of a third embodiment of the flow measuring system according to the invention.
  • Fig. 4 is a schematic representation of an inlet device for a fourth embodiment of the flow measuring system according to the invention.
  • Fig. 5 is a schematic representation of a fifth embodiment of the flow measuring system according to the invention.
  • Fig. 6 is a schematic representation of a sixth embodiment of the flow measuring system according to the invention.
  • Fig. 7 is a schematic representation of a seventh embodiment of the flow measuring system according to the invention.
  • FIG. 8 is a schematic representation of an eighth embodiment of the flow measuring system according to the invention.
  • 9 is a schematic representation of a first embodiment of an evaluation electronics for the flow measuring system according to the invention.
  • FIG. 10 shows a schematic representation of a block diagram of the evaluation electronics according to FIG. 9.
  • a first embodiment of a flow measuring system 10 for determining a flow Fl of a solids-laden first liquid in a pipeline 12 is shown schematically.
  • the flow Fl is illustrated in Fig. 1 by an arrow, which also indicates the flow direction of the first liquid.
  • solids-laden liquid is here and in the following understood an aqueous liquid which has a solids content of mineral substances, such as magnetite and / or other iron-containing minerals.
  • the flow measuring system 10 comprises a first radiometric density measuring point 14 and a second radiometric density measuring point 16,
  • the first radiometric density measuring point 14 comprises a first gamma ray detector 18 and a first radiation source 20, the second radiometric density measuring point 16 a second gamma ray detector 22 and a second radiation source 24.
  • the two radiometric density measuring points 14 and 16 a first density ⁇ l and a second density ⁇ 2 of the liquid determined at different locations of the pipeline 12.
  • the flow F2 of the first liquid through the pipe 12 is illustrated by an arrow.
  • radiometric measuring points 14, 16 are - as usual - connected to a bus 26, for example, a 2-wire bus, preferably for digital signal transmission, via which they are supplied and through which their signals are forwarded.
  • bus 26 for example, a 2-wire bus, preferably for digital signal transmission, via which they are supplied and through which their signals are forwarded.
  • other buses may be used with the invention.
  • a feed device 28 is arranged, which opens into the pipe 12 and through which a second liquid is added to the flowing in the pipe 12 first liquid.
  • the inlet device 28 an inlet piece 30, which is a T-shaped piece of pipe.
  • the T-shaped inlet piece 30 is usually connected to a second conduit 32 for feeding the second liquid.
  • the second liquid is preferably an aqueous liquid, for example water, or soluble in the first liquid.
  • a flow F3 of the second liquid is illustrated in Fig. 1 by an arrow.
  • the flow F3 is preferably known as well as a density ⁇ 3 of the second liquid. For water as a second liquid of known density ⁇ 3 in a downpipe as inlet device 28, the flow F3 can be calculated in a simple manner, knowing its dimensions.
  • Flow Fl in the pipe 12 at the first density measuring point 14 is smaller than the flow F2 at the second density measuring point 16.
  • Flow Fl in the pipe 12 at the first density measuring point 14 is smaller than the flow F2 at the second density measuring point 16.
  • a mass flow Ml measurable Corresponding to a mass flow M2 next to the flow F2 at the second density measuring point 16.
  • the sought flow Fl of the first liquid depends on the measured densities ⁇ l and ⁇ 2, and the known variables ⁇ 3 and F3.
  • a small amount of the second liquid which is just sufficient for the desired determination of the flow Fl of the first liquid, is added to the first liquid.
  • Fig. 2 is another embodiment of the invention.
  • the flow measuring system 10 for determining the flow rate Fl of the solids-laden first liquid in the pipeline 12 shown schematically.
  • the solids-laden first liquid is again an aqueous liquid, preferably water, which has a solids content of mineral substances, for example magnetite and / or other iron-containing minerals.
  • the flow measuring system 10 comprises two radiometric density measuring points 14 and 16, with detectors 18, 22 and two cooperating radiation source 20, 24. They serve, as described above, the detection of the first density ⁇ l and the second density ⁇ 2 of first liquid at various points of the pipe 12th
  • Embodiment of FIG. 1 known arranged with the T-shaped inlet piece 30 through which a second liquid is added to the flowing in the pipe 12 first liquid.
  • the flow F3 of the second liquid is illustrated here by a bent arrow.
  • the flow F3 is preferably known as well as the density p3 of the second liquid.
  • the flow F3 can be calculated, knowing its dimensions.
  • the illustrated in Fig. 2 embodiment of the flow measuring system 10 according to the invention differs from the embodiment shown in FIG. 1 by an additional temperature measuring point 34 for determining the temperature of the liquid.
  • the measuring signals supplied by the detectors 18, 22 of the density measuring points 14, 16 on the output side to the measured densities ⁇ 1 and ⁇ 2 of the liquid in the pipeline 12 in one with the detectors 18, 22 of the density measuring points 14, 16 processed and processed directly or via the bus 26 connected electronics.
  • the electronics are not shown in FIG. It will be explained in detail later in connection with the description of the method according to the invention.
  • Flow measuring system 10 for determining the flow rate Fl of the solids-laden first liquid in the pipe 12 differs from the embodiment shown in Fig. 1 by an additional flow meter 38 in the second line 32.
  • the feed device 28 is a T-pipe-shaped inlet piece 30, which in this case has been integrated into the pipe 12 via a flange connection.
  • a valve 40 is provided between the flow meter 38 and the inlet piece 30, with which the flow F3, so the inflow of the second liquid is adjustable to the flowing in the pipe 12 first liquid to the desired amount.
  • the flow F3 of the second liquid is also here by a kinking
  • the flow F3 of the second liquid is preferably known as well as the density p3 of the second liquid.
  • FIG. 3 Another important aspect illustrated by FIG. 3 relates to
  • a designated in Fig. 3 with "B" distance between the inlet piece 30 and the second density measuring point 16 must be just so large that there is a homogeneous and completely mixed liquid at the density measuring point 16 in the pipeline.
  • the mixing can be improved by special ZLüaufvortechnischen 28, but a certain minimum distance B will be sure to comply. Since the distances A and B depend on the concentration of the solid or solids in the liquid in the pipeline 12, it makes sense to experimentally determine or at least verify the distances.
  • the ZLüaufvorraum 28 schematically shown in Fig. 4 for yet another embodiment of the flow measuring system 10 according to the invention allows a very efficient mixing of the first and second liquid close to the inlet device 28 itself.
  • the inlet device 28 shown here comprises a plurality, preferably radially in the pipeline 12 inlet ZLüaufdüsen 42.
  • the individual inlet nozzles 42 are connected in a suitable manner with the second line 32, for example via flexible hoses.
  • a flow meter 38 is integrated in the second conduit 12 to determine the flow F3 and thus the inlet of the second liquid into the pipe 12 exactly.
  • the second fluid flow F3 is adjustable by a valve 40 integrated with the second conduit 32, similar to the embodiment of the invention shown in FIG.
  • FIG. 5 schematically illustrated embodiment of the flow measuring system 10 according to the invention relates to a sobhe special ZLüaufvorraum 28, with the mixing of the first solids-laden liquid with the supplied second liquid with respect to the T-shaped inlet piece of FIG .. 1 , 2, 3 is improved.
  • the ZLüaufvortechnik 28 comprises in this case connected to the second line 32 and obliquely opening into the pipe 12 inlet piece 30. Similar to the embodiments shown in FIGS. 3 and 4 is in the second line 12 also here Flow meter 38 integrated to determine the flow F3 and thus the inlet of the second liquid into the pipe 12 exactly.
  • a representation of a valve 40 (see also FIGS. 3 and 4) for regulating the flow F3 was omitted here.
  • a sobhes valve 40 can also be easily integrated in the flow measurement system 10 shown in Fig. 5.
  • the desired flow Fl in the pipe 12 can be determined again according to the formula described above.
  • FIG. 6 yet another embodiment of the flow measuring system 10 according to the invention is shown schematically.
  • the exemplary embodiment illustrated here corresponds to the exemplary embodiment according to FIG. 1.
  • a respective radioactive source 20 acts on a detector 18, 22, however, in the embodiment of the flow measuring system 10 according to FIG. 6, only a single source 44 is provided, which cooperates with the two detectors 18 and 20 of the density measuring points 14, 16.
  • the radioactive decay of a radioactive preparation in a source is not a deterministic but a stochastic process.
  • the flow F3 can be regulated by a valve 40 here, too.
  • a flow meter 38 is then preferably provided, with which the actual flow F3 is measured.
  • the desired flow Fl in the pipe 12 can again be determined according to the formula described above.
  • Fig. 7 is a thematic representation again of another embodiment of the flow measuring system 10 according to the invention, in which - similar to the embodiment of Fig. 6 - only a single source 44 with the two detectors 18 and 20 of the density measuring points fourteenth , 16 cooperates.
  • the U-shape of the pipe 12 shown here between the two density measuring points 14, 16 allows, as illustrated in Fig. 7, a placement of the individual source 44 exactly between the detectors 18, 22 of the density measuring points 14, 16.
  • the special shape of the pipeline after the inlet device 28 ensures good mixing of the first liquid with the second liquid mixed in.
  • the inlet device 28 can not be shown in detail here for the sake of simplicity. It may be any inlet device according to one of the other embodiments of FIGS. 1-6, but preferably it is an inlet device as in the embodiment of FIG. 4. Otherwise, this already applies to what already for Embodiment of the flow measuring system 10 of FIG. 6 has been said.
  • FIG. 7 The invention is illustrated schematically in FIG. Similar to the embodiments of FIGS. 6 and 7, only a single source 44 is provided here, which cooperates with the two detectors 18 and 20 of the density measuring points 14, 16.
  • the here shown in Fig. 7 curved shape of the pipe 12 between the two density measuring points 14, 16 allows accurate placement of the individual source 44 between the detectors 18, 22 of the density measuring points 14, 16.
  • the inlet device 28 can not be shown in detail here for the sake of simplicity. It may be any feed device according to one of the other embodiments of FIGS. 1-6, but is preferably an inlet device as in the embodiment of FIG. 4. The further details are already above on the embodiments of Flow measuring system 10 described in FIGS. 6 and 7.
  • the sought flow F3 is determined based on the formula given above.
  • suitable electronics which also generates and outputs the sought-after value or a signal corresponding thereto, preferably on the bus.
  • An exemplary embodiment of such an electronic system is simplified and shown schematically in FIG. 9. This embodiment serves on the one hand to determine the desired flow Fl using the formula given above and on the other hand, it provides switching outputs and - depending on the desired application - also signals for controlling totalizers, for example, for billing, available.
  • a digital bus connected (see also Figs. 1-8) and receives from there the of the densities ⁇ 1 and ⁇ 2 supplied to the detectors 18, 22 of the density measuring points 14, 16 and optionally also the temperature T measured by the temperature measuring point 34 (see FIG. 2) and the flow F 3 detected by the flow measuring device 38 (see in this connection FIG. 4, 5).
  • analog outputs a volume flow output 46 for the solids laden first liquid
  • the calculated value for the Flow F2 provides, a mass flow output 48, which reflects the mass flow Ml at the location of the first density measuring point 14, and a mass flow output 50 for the solids-laden liquid in total
  • the mass flow M2 at the location of the second density measuring point 16th reflects - so after admixture of the second liquid, available.
  • the signals provided at the outputs are based on internal calculations in the electronics. They will be explained later with reference to the flowchart illustrated in FIG.
  • For the volume flow output 46 and the mass flow outputs 48, 50 is here also an associated switching output 52, 54 and 56 in the form of current signals, for example, 4-2OmA, provided for one or more totalizers.
  • For parameterization of the switching outputs 52, 54, 56 parameters V1, V2 and V3 can be entered or set as a desired for the totalizer or the totalizers count rate in volume or mass per output pulse. So switching outputs 52, 54, 56 and their parameterization are common and well known and not the subject of the invention.
  • a density ⁇ c of the carrier liquid of the first solids-laden liquid which need not necessarily be water, and a density ⁇ s of the solid itself can be entered ,
  • the actual concentration of the solid or solid mixture in the first liquid can be considered.
  • Fig. 10 the determination of the desired quantities is shown schematically as a block diagram of the evaluation electronics described above.
  • This value for Fl is summed with the measured or preset value F3, so that the flow F2, ie the volume flow at the second density measuring point 16, results, which in turn is available at the volume flow output 46 as an analog signal.
  • the value for F2 on the Switch output 52 can be provided by means of the parameter V3 and an integrator analog in the form of pulses per volume flow for a totalizer.
  • the set values for the density ⁇ c of the carrier liquid of the first solids-laden liquid and for the density ⁇ s of the solid together with the value of the measured density ⁇ l the actual concentration SC of the solid or solid mixture in the liquid in the unit Density calculated.
  • This value of SC is multiplied by the value of the flow Fl and now provides a value for the mass flow Ml at the location of the first density measuring point 14 to the analog mass flow output 48.
  • the value for Ml on the switching output 54 mithlife of the parameter Vl and an integrator analog, be provided in the form of pulses per volume flow for a totalizer.
  • the value for the second density ⁇ 2 provided by the second density measuring point 16 is multiplied by the calculated value Fl for the volume flow at the first density measuring point 14 and thus provides a value for the mass flow M2 at the location of the second density
  • the value for M2 on the switching output 56 can be provided by means of the parameter V2 and an integrator analog in the form of pulses per volume flow for a totalizer.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Les systèmes connus de mesure de débit qui déterminent le débit d'un liquide chargé en solides utilisent habituellement des dispositifs de mesure et des appareils de mesure qui travaillent sans contact à cause de l'effet abrasif de cette boue. En particulier, dans le cas de boues qui contiennent des mélanges de solides contenant du fer, des appareils de mesure de débit à induction magnétique ou similaires entraînent habituellement d'importantes erreurs de mesure. En revanche, l'invention permet d'obtenir pour des liquides chargés en solides un système de mesure de débit plus simple qui fournit des mesures de plus grande précision et qui de plus est simple à construire et à manipuler. Ce système (10) de mesure de débit selon l'invention comprend au moins un premier et un deuxième emplacements de mesure radiométrique de densité (14, 16) associés au conduit tubulaire (12), qui déterminent une première et une deuxième densités (r1, r2) du liquide, un dispositif d'amenée (28) d'un deuxième liquide étant disposé entre les deux emplacements (14, 16) de mesure de densité et une électronique traitant les signaux des emplacements (14, 16) de mesure de densité pour délivrer un signal de sortie qui correspond au débit (F1) recherché.
PCT/EP2007/060958 2006-10-24 2007-10-15 Système de mesure de débit et procédé de détermination d'un débit d'un liquide chargé en solides dans un conduit WO2008049752A1 (fr)

Applications Claiming Priority (2)

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DE102006050656.1 2006-10-24
DE200610050656 DE102006050656A1 (de) 2006-10-24 2006-10-24 Durchflußmeßsystem und Verfahren zur Bestimmung eines Durchflusses einer feststoffbeladenen Flüssigkeit in einer Leitung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007062908A1 (de) * 2007-12-21 2009-06-25 Endress + Hauser Flowtec Ag Verfahren und System zur Bestimmung mindestens einer Prozessgröße eines strömenden Mediums
DE102009042047A1 (de) * 2009-09-17 2010-12-02 Siemens Aktiengesellschaft Vorrichtung und Verfahren zum Messen der Geschwindigkeit eines mehrphasigen Fluids

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DE2325943A1 (de) * 1972-05-23 1973-12-20 Lkb Medical Ab Verfahren zur messung der augenblicklichen stroemungsmenge einer intermittierenden stroemung und vorrichtung zur durchfuehrung des verfahrens
US4064440A (en) * 1976-06-22 1977-12-20 Roder Frederick L X-ray or gamma-ray examination device for moving objects
DE3212972A1 (de) * 1981-07-17 1983-02-03 Brennstoffinstitut Freiberg, Ddr 9200 Freiberg Messverfahren zur ermittlung des massenstromes staubfoermiger und feinkoerniger brennstoffe
US5050438A (en) * 1989-10-02 1991-09-24 Ezell Jr Oscar L Method and apparatus for measuring the flow of heavy crude
EP0635702A1 (fr) * 1993-07-23 1995-01-25 Onoda Cement Company, Ltd. Procédé et dispositif pour la mesure d'un débit massique d'une poudre
EP1654981A2 (fr) * 1999-10-19 2006-05-10 Transonic Systems, Inc. Appareil de mesure du débit par introduction d'un changement de volume

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US3946605A (en) * 1973-11-19 1976-03-30 Tekken Kensetu Co. Ltd. Apparatus and method of measuring fluctuations of excavated mud amount in a slurry line
US5259250A (en) * 1990-05-14 1993-11-09 Atlantic Richfield Company Multi-phase fluid flow mesurement
US5224372A (en) * 1990-05-14 1993-07-06 Atlantic Richfield Company Multi-phase fluid flow measurement
US5654551A (en) * 1992-05-22 1997-08-05 Commonwealth Scientific And Industrial Research Organisation Method and apparatus for the measurement of the mass flow rates of fluid components in a multiphase slug flow
GB2396907B (en) * 2002-12-31 2005-03-16 Schlumberger Holdings Method and apparatus for monitoring solids in pipes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2325943A1 (de) * 1972-05-23 1973-12-20 Lkb Medical Ab Verfahren zur messung der augenblicklichen stroemungsmenge einer intermittierenden stroemung und vorrichtung zur durchfuehrung des verfahrens
US4064440A (en) * 1976-06-22 1977-12-20 Roder Frederick L X-ray or gamma-ray examination device for moving objects
DE3212972A1 (de) * 1981-07-17 1983-02-03 Brennstoffinstitut Freiberg, Ddr 9200 Freiberg Messverfahren zur ermittlung des massenstromes staubfoermiger und feinkoerniger brennstoffe
US5050438A (en) * 1989-10-02 1991-09-24 Ezell Jr Oscar L Method and apparatus for measuring the flow of heavy crude
EP0635702A1 (fr) * 1993-07-23 1995-01-25 Onoda Cement Company, Ltd. Procédé et dispositif pour la mesure d'un débit massique d'une poudre
EP1654981A2 (fr) * 1999-10-19 2006-05-10 Transonic Systems, Inc. Appareil de mesure du débit par introduction d'un changement de volume

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