CN105910663B - A kind of device and method measuring biphase gas and liquid flow flow - Google Patents
A kind of device and method measuring biphase gas and liquid flow flow Download PDFInfo
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- CN105910663B CN105910663B CN201610210009.4A CN201610210009A CN105910663B CN 105910663 B CN105910663 B CN 105910663B CN 201610210009 A CN201610210009 A CN 201610210009A CN 105910663 B CN105910663 B CN 105910663B
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- 239000007788 liquid Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005514 two-phase flow Effects 0.000 claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 37
- 239000000523 sample Substances 0.000 claims abstract description 37
- 238000012545 processing Methods 0.000 claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 63
- 239000012071 phase Substances 0.000 claims description 53
- 239000007791 liquid phase Substances 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 7
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- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
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Classifications
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- 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
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
Abstract
The present invention provides a kind of device and methods for measuring biphase gas and liquid flow flow.The device of the measurement biphase gas and liquid flow flow includes outer tube, inner tube, backbone, near infrared emission probe, near-infrared receiving transducer, differential pressure transmitter, data acquisition unit and data processing unit；Inner tube is located in outer tube, and is located on the axial line of outer tube；Inner tube includes sequentially connected large-diameter pipe, transition oblique shoulder and small-bore pipe；The first pressure tap and the second pressure tap are provided on the side wall of outer tube, third pressure tap corresponding with the second pressure tap is provided on the large-diameter pipe of inner tube, it can measure the pressure difference in inner and outer pipes by three pressure taps, the light intensity of the near infrared light received according to pressure difference and near-infrared receiving transducer can calculate each phase flow rate in two phase flow.The present invention can accurately measure each phase flow rate in biphase gas and liquid flow in the case where not separating biphase gas and liquid flow.
Description
Technical field
The present invention relates to a kind of two-phase flow detection device, specifically a kind of dress for measuring biphase gas and liquid flow flow
It sets and method.
Background technique
Currently, the method measured to the flow of biphase gas and liquid flow has very much, such as：Separating and measuring method, single-phase flowmeter
Combined two-parameter measurement method, direct-type mass measurement, single-phase flowmeter and phase content instrument combine mensuration etc..But this
A little measurement methods respectively have advantage and disadvantage again, are now described below respectively：
Separating and measuring method is the single-phase flow that two phase flow is separated into liquid and gas using separator, then with single-phase flow
Meter measures respectively.Partition method reliable operation, measurement accuracy are high, measurement range is wide, and measurement result not by variations in flow patterns etc. because
The influence of element, is the oil and gas production metering method being widely used in current land oil field, other on-line multiphase flowmeters are generally
Calibrating verification is all carried out by the comparison with separating and measuring method.But separating and measuring method is maximum the disadvantage is that separation equipment volume is huge
Greatly, system cost is expensive, the degree of automation is low, and can not carry out the flow measurement of multiphase flow real-time, quickly.
The two-parameter measurement method of single-phase flow meter, when single-phase flowmeter is in the measurement of two phase flow, common group
Conjunction has：Spectacle plate, orifice plate-Venturi tube, orifice plate-even speed tube, target type meter-turbine flowmeter, Venturi tube-turbine flow
Meter, restricting element-volumetric flowmeter, dual grooved orifice plate etc..But the effective range of these measurements in a closed series is limited, measurement
Effect is affected by flow pattern.
Direct-type mass measurement mainly has angular momentum formula turbine flowmeter and Coriolis force mass flowmenter.This two
Kind mass flowmenter can provide high-precision flow measurement, and measurement result is not influenced by fluid density, can not
Phase content, which must be predicted, can measure the flow of two phase flow.Angular momentum formula turbine flowmeter can be suitable for various types of two-phases
Stream flow measurement, but the proper flow of meeting severe jamming detected fluid, and bring very big flow resistance.Coriolis force matter
Amount flowmeter can be advantageously applied to the measurement of liquid-liquid diphasic flow, however its measurement effect will receive existing gas in pipe
It influences, therefore its application in biphase gas and liquid flow is also in the initial stage of research.
Single-phase flowmeter and phase content instrument combine mensuration, Many researchers are using this technology path to gas-liquid at present
The measurement of two phase flow is studied, and open report has：Venturi tube, turbine combine measurement gas-liquid with voidage meter respectively
Two phase flow, electromagnetic flowmeter and differential pressure pick-up are combined and are measured to bubble flow and slug flow and some other researcher
Two phase flow is measured with the method that conductance, capacitor phase content meter combine using orifice plate, Venturi tube, Venturi nozzle.
Other than above-mentioned several measurement methods, to the measurement of two phase flow, there are also acoustic method, calorifics method, pulse seeds to activate
Method, radioactive-tracer method, optical particle trace method etc..It is overall although various methods have some applications in certain specific occasions
For, due to the complexity of two phase flow and the diversity of two phase flow operating condition, two-phase flow measurement problem is still without obtaining
Very good solution.
Summary of the invention
An object of the present invention is just to provide a kind of device for measuring biphase gas and liquid flow flow, which is based on inner and outer pipes
Differential pressure flowmeter and constitute, the flow of each phase in biphase gas and liquid flow can be accurately measured using the device.
The second object of the present invention be just to provide it is a kind of measure biphase gas and liquid flow flow method, using this method without pair
Two phase flow, which carries out separation, can accurately measure the separate phase flow rate of biphase gas and liquid flow.
What an object of the present invention was realized in：A kind of device measuring biphase gas and liquid flow flow, including：
Outer tube, for circle straight tube structure；First for measuring outer tube fluid pressure is provided on the side wall of the outer tube
Pressure tap, is also provided with the second pressure tap on the side wall of the outer tube, and second pressure tap and first pressure tap are in
On the same cross section of the outer tube and the two is centrosymmetric distribution about the cross-section center；
Inner tube is placed in the outer tube, and is located on the axial line of the outer tube；Said inner tube includes sequentially connected big
Bore pipe, transition oblique shoulder and small-bore pipe；Two phase flow fluid flows in outer tube when measurement, and along the large-diameter pipe of inner tube to small
The flowing of bore pipe direction；Third pressure tap, the third pressure tap and the outer tube are provided on the large-diameter pipe of said inner tube
The second pressure tap on side wall is oppositely arranged；It can measure the stream in inner tube by second pressure tap and the third pressure tap
Body pressure；
Backbone is arranged between the lateral wall of said inner tube and the inner sidewall of the outer tube, is used to support said inner tube；
Near infrared emission probe, is arranged on the lateral wall of the outer tube, and at the fluid inlet of the outer tube；Institute
Near infrared emission probe is stated for emitting near infrared light with the fluid in section irradiation outer tube；
The lateral wall with outer tube of the near infrared emission probe in same cross section is arranged in near-infrared receiving transducer
On, and be centrosymmetric distribution near infrared emission probe about the cross-section center of outer tube；The near-infrared, which receives, to be visited
Head is for receiving the light intensity signal of the near infrared light after fluid absorbs；
Differential pressure transmitter connects with data acquisition unit, for by first pressure tap, second pressure tap and
The third pressure tap measures the pressure difference of inside and outside tube fluid；
Data acquisition unit, respectively with the near-infrared receiving transducer, the differential pressure transmitter and data processing unit phase
It connects, for acquiring the differential pressure signal of inside and outside tube fluid, while acquiring and being inhaled received by near-infrared receiving transducer through fluid
The light intensity signal of near infrared light after receipts, and received signal is sent to data processing unit；And
Data processing unit connects with the data acquisition unit, for calculating gas-liquid two-phase according to the signal received
Each phase flow rate in stream.
Preferably, the quantity of the backbone is three, and three backbones are uniformly distributed along the lateral wall of said inner tube.
Preferably, second on the corresponding outer tube in the side of one of backbone to fit with the outer tube inner sidewall
Pressure tap, the third pressure tap in the corresponding said inner tube in the side of the backbone to fit with said inner tube lateral wall；In the ridge
Position corresponding with second pressure tap is provided with jack hole on column, and the jack hole is surveyed for realizing the second pressure tap and third
Press the connection in hole.
Preferably, the length of the backbone and the length of said inner tube are identical, and the end part aligning of the two.
Preferably, there are four the near infrared emission probes, the near-infrared receiving transducer and the near infrared emission are visited
The quantity of head and position correspond；Mutual corresponding near infrared emission probe and near-infrared receiving transducer are on outer tube cross section
It is symmetrical with the straight line in the excessively outer tube section center of circle.
Backbone is arranged by the way that inner tube is arranged in outer tube, and between outer tube inner sidewall and inner tube lateral wall in the present invention, with
Realization is supported inner tube, it is ensured that inner tube remains stationary in measurement process, so that pressure result prepares, guarantees
The accuracy that later period calculates.By opening the first pressure tap on outer tube, the pressure of outer tube fluid can be measured；By inside
Third pressure tap is opened on pipe, and opens the second pressure tap corresponding with third pressure tap on outer tube, can measure interior tube fluid
Pressure；The difference of the pressure in pressure and outer tube in inner tube is the pressure difference in inner and outer pipe.The present invention passes through in inner and outer pipe
Pressure difference can calculate gas-liquid total mass flow rate in two phase flow, which is corrected the rear matter up to gas phase
Measure flow.Further according to the light intensity signal after fluid absorbs that near-infrared receiving transducer receives, liquid in two phase flow can be calculated
The phase content of phase.The mass flow of the phase content combination gas phase of liquid phase can calculate the mass flow of liquid phase.
Device provided by the present invention is the flow theory by two phase flow, in conjunction with the signal detection principle of near infrared light,
CFD emulation technology is recycled, is designed and is optimized and formed；Also sufficiently demonstrated by many experiments the reasonability of the present apparatus with
And feasibility.
The second object of the present invention is to what is be achieved：A method of measurement biphase gas and liquid flow flow, including walk as follows
Suddenly：
A, inner tube and backbone are set in outer tube；The outer tube is circle straight tube structure, is provided on the side wall of the outer tube
First pressure tap and the second pressure tap, the first pressure tap and the second pressure tap are on the same cross section of the outer tube and the two
It is centrosymmetric distribution about the cross-section center；Said inner tube is located on the axial line of the outer tube；Said inner tube include according to
Large-diameter pipe, transition oblique shoulder and the small-bore pipe of secondary connection；Third pressure tap is provided on the large-diameter pipe of said inner tube, it is described
Third pressure tap is oppositely arranged with the second pressure tap on outer tube wall；The backbone be located at the lateral wall of said inner tube with it is described
Between the inner sidewall of outer tube, it is used to support said inner tube；
B, setting near infrared emission is popped one's head at fluid inlet on the lateral wall of the outer tube and near-infrared is received and visited
Head；The near infrared emission probe and the near-infrared receiving transducer are on the same cross section of outer tube, and the two is about outer
The cross-section center of pipe is centrosymmetric distribution；Biphase gas and liquid flow flows in outer tube, and along the large-diameter pipe of inner tube to osculum
The flowing of diameter pipe direction；
C, by drive module driving near infrared emission probe transmitting near infrared light, the near infrared light emitted is transversal along outer tube
Face penetrates the fluid in outer tube, and near-infrared receiving transducer receives the light intensity signal of the near infrared light after fluid absorbs, and by institute
The signal received is sent to data processing unit through data acquisition unit；
D, fluid is measured inside and outside by the first pressure tap, the second pressure tap and third pressure tap by differential pressure transmitter
Pressure difference in pipe, and institute's measured data is sent to data processing unit through data acquisition unit；
E, data processing unit is according to pressure difference of the fluid received in inner and outer pipe and close after fluid absorbs
The light intensity of infrared light calculates each phase flow rate in biphase gas and liquid flow.
In step e in calculating biphase gas and liquid flow when each phase flow rate, it is first depending on formula (1) and calculates gas in biphase gas and liquid flow
Liquid total mass flow rate：
In formula (1), ε is the coefficient of expansion, and C is efflux coefficient, and β is Throttling ratio, and D is outer tube diameter, ρgFor the close of two phase flow
Degree, Δ ptpFor the pressure difference in inner and outer pipe measured by differential pressure transmitter in step d；
Secondly virtual height amendment, the following formula of concrete foundation are carried out to the obtained gas-liquid total mass flow rate of formula (1)：
In formula (2), ΦgFor correction factor, WgFor the mass flow of gas phase in two phase flow；
ΦgSpecific formula for calculation be：
Φg=a+bX+cX2 (3)
In formula (3), a, b, c are fitting coefficient, and X is the pressure in step d in inner and outer pipe measured by differential pressure transmitter
Power is poor；
Then according to the light intensity for the near infrared light after fluid absorbs that near-infrared receiving transducer in step c receives, meter
The thickness h for the liquid that near infrared light is passed through in two phase flow is calculated, specific formula for calculation is as follows：
Y=A*exp (B*h) (4)
In formula (4), A, B are coefficient, and " * " is multiplication sign, and the expression formula of y is：
In formula (5), I is the light for the near infrared light after fluid absorbs that near-infrared receiving transducer receives in step c
By force, I0The light intensity of near infrared light received by near-infrared receiving transducer when for fluid being not present in outer tube；
The phase content α of liquid phase in two phase flow is calculated according to the thickness h of formula (4) calculated liquidl：
In formula (6), r is the inside radius of outer tube；
Finally according to αlAnd the W in formula (2)gCalculate the mass flow W of liquid phase in two phase flowl, specific formula is as follows：
Method provided by the present invention is measured primarily directed to biphase gas and liquid flow (namely moisture).By to gas-liquid
The test of the flow regime of two phase flow extracts useful signal, and carries out signal characteristic abstraction, can finally not separate two phase flow
Under the premise of in accurately measure two phase flow each phase flow.
Detailed description of the invention
Fig. 1 is the structural schematic diagram at pipeline position in measuring device of the present invention.
Fig. 2 is the structural schematic diagram of inner tube and backbone in measuring device of the present invention；Wherein, Fig. 2 (a) is side view, Fig. 2
It (b) is end-view.
Fig. 3 is the end-view of Fig. 1.
Fig. 4 is the structural schematic diagram of gas phase and liquid phase distribution in inventive pipeline.
Fig. 5 is the structural schematic diagram of measuring device of the present invention.
Specific embodiment
Embodiment 1, a kind of device measuring biphase gas and liquid flow flow.
As depicted in figs. 1 and 2, it is provided by the present invention measurement biphase gas and liquid flow flow device include outer tube 1, inner tube,
Backbone 8, near infrared emission probe 10, near-infrared receiving transducer 11, differential pressure transmitter, data acquisition unit and data processing list
Member.Differential pressure transmitter, data acquisition unit and data processing unit are not shown in Fig. 1.
Outer tube 1 is cylindrical straight tube structure；Inner tube is arranged in outer tube 1, and is located on the axial line of outer tube 1, i.e. outer tube 1
Axial line be overlapped with the axial line of inner tube.Inner tube includes sequentially connected large-diameter pipe 2, transition oblique shoulder 3 and small-bore pipe 4.
Large-diameter pipe 2 and small-bore pipe 4 are straight tube structure, and transition oblique shoulder 3 connects large-diameter pipe 2 and small-bore pipe 4, transition oblique shoulder 3
For round table-like pipe.When measuring two-phase flow, two phase flow flows in outer tube 1, and along the large-diameter pipe of inner tube 2 to small-bore
Flow (see direction shown in arrow in Fig. 1) in 4 direction of pipe.
The first pressure tap 5 for measuring outer tube fluid pressure is provided on the side wall of outer tube 1, in the side wall of outer tube 1
On be also provided with the second pressure tap 6, the second pressure tap 6 and the first pressure tap 5 be on the same cross section of outer tube 1 and the two about
The cross-section center is centrosymmetric distribution.It is provided with third pressure tap 7 on the large-diameter pipe 2 of inner tube, third pressure tap 7 and outer
The second pressure tap 6 on 1 side wall of pipe is oppositely arranged；It can measure the fluid in inner tube by the second pressure tap 6 and third pressure tap 7
Pressure.The difference of the Fluid pressure in Fluid pressure and outer tube in inner tube is the pressure difference in inner and outer pipe, which can be by
Differential pressure transmitter is acquired, is measured.By the pressure difference in inner and outer pipe in conjunction in correlation formula you can get it biphase gas and liquid flow
The mass flow of gas phase.Also show the pressure tap opened on small-bore pipe 4 in Fig. 1, and with the pressure tap on small-bore pipe 4
Pressure tap on the outer tube on same cross section can equally be measured the pressure difference in inner and outer pipe by the two pressure taps,
The road pressure difference is not directed in this patent.
Backbone 8 is arranged between the lateral wall of inner tube and the inner sidewall of outer tube 1.As shown in Fig. 2 (a), backbone 8 is strip
Structure, length is identical as the length of inner tube, and both ends are aligned with the both ends of inner tube respectively.The outside of backbone 8 is interior with outer tube 1
Side wall fits, and the inside of backbone 8 and the lateral wall of inner tube fit, and can be realized by backbone 8 and be supported well to inner tube, with
Just remain stationary inner tube in measurement process.
As shown in Fig. 2 (b) and Fig. 3, the quantity of backbone 8 is three in the present invention, and three backbones 8 are evenly distributed on inner tube
On lateral wall, the structure of this symmetry can not only be realized to the good supporting role of inner tube, it is also ensured that be flowed in measurement process
The symmetry of body circulation, to guarantee the accurate of pressure result.
As shown in Figure 1, preferred embodiment is：Make in three backbones 8 one of them just correspond to the second pressure tap 6
With third pressure tap 7, i.e.,：Make the outside (i.e. backbone with the side that outer tube inner sidewall fits) corresponding second of one of backbone
Pressure tap 6 makes the corresponding third pressure tap 7 in the inside (i.e. backbone with the side that inner tube lateral wall fits) of the backbone.To realize
Connection (to carry out survey pressure to the fluid in inner tube) between second pressure tap 6 and third pressure tap 7, needs at this time in the ridge
Jack hole 9 is opened at position corresponding with the second pressure tap 6 and third pressure tap 7 on column, realizes the second pressure tap 6 by jack hole 9
With being connected to for third pressure tap 7.It is subsequent survey pressure when, so that one end of differential pressure transmitter is sequentially passed through the second pressure tap 6, jack hole
9 and third pressure tap 7, so that the other end of differential pressure transmitter is passed through the first pressure tap 5, it just can be to the Fluid pressure in inner and outer pipe
Difference measures.
Near infrared emission probe 10 and near-infrared receiving transducer 11 are arranged on the lateral wall of outer tube 1, and close to outer tube 1
Fluid inlet at.Preferably, big mouth of the setting position away from inner tube of near infrared emission probe 10 and near-infrared receiving transducer 11
It is the internal diameter D of outer tube 1 at diameter pipe port.Near infrared emission probe 10 and near-infrared receiving transducer 11 are arranged in pairs, such as Fig. 3 institute
Show, be provided with four pairs of near infrared emission probes 10 and near-infrared receiving transducer 11 in the present invention altogether, this four pairs of near infrared emissions are visited
First 10 and near-infrared receiving transducer 11 be respectively positioned on the same cross section of outer tube 1, and every a pair of of near infrared emission probe 10 and close
Infrared receiver probe 11 is centrosymmetric distribution about the cross-section center of the outer tube 1 where it, in other words, every a pair of close red
The straight line that outer transmitting probe 10 and near-infrared receiving transducer 11 cross the 1 section center of circle of outer tube on 1 cross section of outer tube is pair
Claim distribution.
Near infrared emission probe 10 is for emitting near infrared light with the fluid in the cross section of outer tube 1 irradiation outer tube 1；With
(or being correspondingly arranged) the near-infrared receiving transducer 11 that near infrared emission probe 10 is arranged in pairs is for receiving after fluid absorbs
Near infrared light light intensity signal.
Data acquisition unit for acquiring signal and transmitted, differential pressure transmitter pressure in collected inner and outer pipe
The light intensity signal of near infrared light received by power difference signal and near-infrared receiving transducer after fluid absorbs, by data
Acquisition unit acquires and is transmitted to data processing unit；Data processing unit is according to the pressure difference meter in the inner and outer pipe received
The total mass flow rate and gas phase mass flow in biphase gas and liquid flow are calculated, further according to the light intensity of the near infrared light after fluid absorbs
The phase content for calculating liquid phase in biphase gas and liquid flow, the matter of liquid phase can be calculated in conjunction with the mass flow of liquid phase phase content and gas phase
Measure flow.Specific formula for calculation can be found in described in following example.
Embodiment 2, a method of measurement biphase gas and liquid flow flow.
As shown in FIG. 1 to FIG. 2, the method for measurement biphase gas and liquid flow flow provided by the present invention includes the following steps：
A, inner tube and backbone 8 are set in outer tube 1.
Outer tube 1 is cylindrical straight tube structure, and the first pressure tap 5 and the second pressure tap 6 are provided on the side wall of outer tube 1, the
One pressure tap 5 and the second pressure tap 6 are on the same cross section of outer tube 1 and the two is centrosymmetric about the cross-section center
Distribution.It can measure the pressure of two phase flow in outer tube 1 by the first pressure tap 5.Inner tube is located on the axial line of outer tube 1；Inner tube packet
Include sequentially connected large-diameter pipe 2, transition oblique shoulder 3 and small-bore pipe 4.Third pressure tap is provided on the large-diameter pipe 2 of inner tube
7, third pressure tap 7 is oppositely arranged with the second pressure tap 6 on 1 side wall of outer tube；Pass through the second pressure tap 6 and third pressure tap 7
It can measure the pressure of two phase flow in inner tube.
Backbone 8 is located between the lateral wall of inner tube and the inner sidewall of outer tube 1, the lateral wall and outer tube 1 of backbone 8 and inner tube
Inner sidewall fit, setting purpose be to support inner tube.As shown in Fig. 2, in the lateral wall of inner tube in the present embodiment
On be uniformly arranged three backbones 8.
B, near infrared emission probe 10 and near-infrared receiving transducer are set at fluid inlet on the lateral wall of outer tube 1
11.Near infrared emission probe 10 and near-infrared receiving transducer 11 are arranged in pairs, and four pairs of near infrared emissions are provided in the present embodiment
Probe 10 and near-infrared receiving transducer 11, as shown in Figure 3.All near infrared emission probes 10 and near-infrared receiving transducer 11 are located
In on the same cross section of outer tube 1, and the near infrared emission probe 10 and near-infrared receiving transducer 11 that are arranged in pairs are about outer tube 1
Cross-section center be centrosymmetric distribution.In conjunction with Fig. 5, biphase gas and liquid flow flows in outer tube, and along the large-diameter pipe of inner tube 2
It is flowed to small-bore pipe direction 4.
C, by the near infrared light of 10 transmitting 970nm of drive module driving near infrared emission probe, the near infrared light emitted
Fluid in 1 cross section of outer tube irradiation outer tube 1, near-infrared receiving transducer 11 receive the light of the near infrared light after fluid absorbs
Strong signal, and received signal is sent to data processing unit through data acquisition unit.Infrared data's acquisition in Fig. 5
Module includes near infrared emission probe and near-infrared receiving transducer.
Including d, measuring fluid by the first pressure tap 5, the second pressure tap 6 and third pressure tap 7 by differential pressure transmitter,
Pressure difference in outer tube, and institute's measured data is sent to data processing unit through data acquisition unit.Another differential pressure becomes in Fig. 5
Device another way pressure difference collected is sent not use in this patent.
E, data processing unit is according to pressure difference of the fluid received in inner and outer pipe and close after fluid absorbs
The light intensity of infrared light carries out module optimization first, then calculates gas-liquid total flow and liquid phase phase content, then calculate each phase flow rate.
Specifically, the total mass flow rate being first depending in formula (1) calculating biphase gas and liquid flow：
In formula (1), ε is the coefficient of expansion (can be obtained by theoretical formula method), and C is that efflux coefficient (comes really by testing
It is fixed), β is Throttling ratio, and D is outer tube diameter, ρgFor density (the unit Kg/m of two phase flow3, measurement can be passed through at fluid inlet
Learn), Δ ptpFor the pressure difference (unit Pa) in inner and outer pipe measured by differential pressure transmitter in step d.
In the present invention, inner tube is as throttling element, when fluid flows through throttling element, due to the scalable effect of throttling element, stream
Know from experience the external shunt in throttling element, and generate certain inside and outside differential pressure, which is differential pressure transmitter institute in step d
Pressure difference in the inner and outer pipe of measurement.
The specific formula for calculation of Throttling ratio β is：
In formula (2), K2For the section of small-bore pipe and large-diameter pipe ratio, K1For the annular space face of small-bore pipe and large-diameter pipe
Product ratio.During the design of Simulation of the present embodiment, it has been determined that β 0.6.
Biphase gas and liquid flow is also referred to as moisture or ring mist flow, is that there are a small amount of liquid in gas, therefore step d is surveyed
Inner and outer pipe pressure differential Δ ptpIt is the pressure there are virtual height for relatively pure gas pressure, by formula (1) W calculatedtp
For the total mass flow rate of gas-liquid, by total mass flow rate WtpThe quality stream of gas phase in two phase flow can be obtained by carrying out virtual height amendment
Amount.
Pass through the correction factor Φ of one virtual height of introducing in the present inventiongCarry out total mass flow rate W obtained to formula (1)tp
It is modified, the following formula of concrete foundation：
In formula (3), ΦgFor correction factor, WgFor the mass flow of gas phase in revised two phase flow；
Correction factor ΦgSpecific formula for calculation be：
Φg=a+bX+cX2 (4)
In formula (4), a, b, c are fitting coefficient (can be obtained by testing by software), and X is differential pressure transporting in step d
Pressure difference in inner and outer pipe measured by device.
In the mass flow W for acquiring gas phase in two phase flow according to formula (3)gAfterwards, the mass flow W of liquid phase need to be only found out againl
?.In the mass flow W for seeking liquid phaselBefore, the present invention calculates the phase content of liquid phase first.
After near infrared light passes through the fluid in outer tube in step c, fluid can absorb part near infrared light, so that close red
The light intensity decreasing for the near infrared light that outer receiving transducer receives.The light intensity for the near infrared light that near-infrared receiving transducer receives can be by
Voltage value indicates, according to near-infrared absorption characteristic-Lang Mu Beer law it is found that the voltage value of near infrared light intensity with it is close red
The thickness for the liquid phase that outer light is passed through in two phase flow exponentially form relation formula selects the ratio of voltage to improve fitting precision
Value is used as near infrared light intensity, specifically meets following measurement model：
Y=A*exp (B*h) (5)
In formula (5), A, B are coefficient, and the expression formula of y is：
In formula (6), I is the light for the near infrared light after fluid absorbs that near-infrared receiving transducer receives in step c
(corresponding voltage value) by force, I0When for fluid being not present in outer tube (when outer tube is blank pipe) received by near-infrared receiving transducer
Near infrared light light intensity (corresponding voltage value), I0It can measure and obtain in advance.
The light intensity of the near infrared light after fluid absorbs received according to near-infrared receiving transducer in step c is (corresponding
Voltage value) I (mean value will be taken to data received by four near-infrared receiving transducers), outer tube can be calculated in conjunction with formula (5)
The thickness h (i.e. near infrared light passed through the thickness of liquid) of liquid, can acquire outer tube according to the thickness h of liquid in interior two phase flow
The phase content of interior liquid phase.Specific calculating process is as follows：
When near infrared light passes through outer tube, an atmosphere bullet perhaps multiple minute bubbles or intermediate fog, tube wall can be passed through
The case where place is liquid pearl, in either case, gas be all in the duct at the heart and surrounding is surrounded by liquid, near infrared light
It first passes through liquid and then passes through gas finally again by liquid.It is therefore the near infrared light about axisymmetric in outer tube
Measurement result after penetrating in all directions should be theoretically consistent, and the position of bubble distribution will not influence shared by it
The ratio of pipeline section.Therefore, various minute bubbles are infinitely fused into an air pocket, as shown in figure 4, the radius of air pocket is
R', the interior liquid of pipeline (in the present invention be outer tube) with a thickness of h, the radius of pipeline be r (middle external tube i.e. of the present invention it is interior partly
Diameter, that is, the half of internal diameter D), then liquid phase phase content is the area and entire conduit cross-sectional area of corresponding annulus
Ratio.
As shown in Figure 4, the radius of gas phase is in pipeline：
R'=r-h/2 (7)
Gas phase occupied area is in pipeline：
SGas=π r'2 (8)
Conduit cross-sectional area is：
SAlways=π r2 (9)
The cross-sectional area of pipeline interior annular liquid phase is：
SLiquid=SAlways-SGas (10)
Then, liquid phase section phase content is
Therefore, finally obtaining liquid phase section phase content is：
In formula (12), r is the inside radius of outer tube, the i.e. half of outer tube diameter D.
And due toTherefore, according to αlAnd WgThe mass flow W of liquid phase in two phase flow can be calculatedl,
Specific formula is as follows：
Claims (7)
1. a kind of device for measuring biphase gas and liquid flow flow, including outer tube, inner tube, differential pressure transmitter, data acquisition unit sum number
According to processing unit；It is characterized in that further including backbone, near infrared emission probe and near-infrared receiving transducer；
The outer tube is circle straight tube structure；First for measuring outer tube fluid pressure is provided on the side wall of the outer tube to survey
Hole is pressed, the second pressure tap is also provided on the side wall of the outer tube, second pressure tap and first pressure tap are in institute
It states on the same cross section of outer tube and the two is centrosymmetric distribution about the cross-section center；
Said inner tube is placed in the outer tube, and is located on the axial line of the outer tube；Said inner tube includes sequentially connected big
Bore pipe, transition oblique shoulder and small-bore pipe；Two phase flow fluid flows in outer tube when measurement, and along the large-diameter pipe of inner tube to small
The flowing of bore pipe direction；Third pressure tap, the third pressure tap and the outer tube are provided on the large-diameter pipe of said inner tube
The second pressure tap on side wall is oppositely arranged；It can measure the stream in inner tube by second pressure tap and the third pressure tap
Body pressure；
The backbone is arranged between the lateral wall of said inner tube and the inner sidewall of the outer tube, is used to support said inner tube；
The near infrared emission probe is arranged on the lateral wall of the outer tube, and at the fluid inlet of the outer tube；Institute
Near infrared emission probe is stated for emitting near infrared light with the fluid in section irradiation outer tube；
The lateral wall with outer tube of the near infrared emission probe in same cross section is arranged in the near-infrared receiving transducer
On, and be centrosymmetric distribution near infrared emission probe about the cross-section center of outer tube；The near-infrared, which receives, to be visited
Head is for receiving the light intensity signal of the near infrared light after fluid absorbs；
The differential pressure transmitter connects with the data acquisition unit, for surveying pressure by first pressure tap, described second
Hole and the third pressure tap measure the pressure difference of inside and outside tube fluid；
The data acquisition unit respectively with the near-infrared receiving transducer, the differential pressure transmitter and the data processing unit
Connect, for acquiring the differential pressure signal of inside and outside tube fluid, while acquiring received by near-infrared receiving transducer through fluid
The light intensity signal of near infrared light after absorption, and received signal is sent to data processing unit；
The data processing unit connects with the data acquisition unit, for calculating biphase gas and liquid flow according to the signal received
In each phase flow rate.
2. the device of measurement biphase gas and liquid flow flow according to claim 1, characterized in that the quantity of the backbone is three
It is a, and three backbones are uniformly distributed along the lateral wall of said inner tube.
3. it is according to claim 2 measurement biphase gas and liquid flow flow device, characterized in that one of backbone with institute
State the side that outer tube inner sidewall fits and correspond to the second pressure tap on the outer tube, the backbone with said inner tube lateral wall phase
The side of fitting corresponds to the third pressure tap in said inner tube；Position corresponding with second pressure tap is provided on the backbone
Jack hole, the jack hole for realizing the second pressure tap and third pressure tap connection.
4. the device of measurement biphase gas and liquid flow flow according to claim 1, characterized in that the length of the backbone and institute
The length for stating inner tube is identical, and the end part aligning of the two.
5. the device of measurement biphase gas and liquid flow flow according to claim 1, characterized in that the near infrared emission probe
There are four, the quantity and position of the near-infrared receiving transducer and near infrared emission probe correspond；It is mutual corresponding
Near infrared emission probe and near-infrared receiving transducer are symmetrical with the straight line in the excessively outer tube section center of circle on outer tube cross section
Distribution.
6. a kind of method for measuring biphase gas and liquid flow flow, characterized in that include the following steps：
A, inner tube and backbone are set in outer tube；The outer tube is circle straight tube structure, is provided with first on the side wall of the outer tube
Pressure tap and the second pressure tap, the first pressure tap and the second pressure tap be on the same cross section of the outer tube and the two about
The cross-section center is centrosymmetric distribution；Said inner tube is located on the axial line of the outer tube；Said inner tube includes successively connecting
Large-diameter pipe, transition oblique shoulder and the small-bore pipe connect；Third pressure tap, the third are provided on the large-diameter pipe of said inner tube
Pressure tap is oppositely arranged with the second pressure tap on outer tube wall；The backbone is located at the lateral wall and the outer tube of said inner tube
Inner sidewall between, be used to support said inner tube；
B, near infrared emission probe and near-infrared receiving transducer are set at fluid inlet on the lateral wall of the outer tube；Institute
It states near infrared emission probe and the near-infrared receiving transducer is on the same cross section of outer tube, and cross of the two about outer tube
Kernel of section is centrosymmetric distribution；Biphase gas and liquid flow flows in outer tube, and along the large-diameter pipe of inner tube to small-bore pipe side
To flowing；
C, by drive module driving near infrared emission probe transmitting near infrared light, the near infrared light emitted is worn along outer tube cross section
Fluid in saturating outer tube, near-infrared receiving transducer receive the light intensity signal of the near infrared light after fluid absorbs, and will be received
To signal be sent to data processing unit through data acquisition unit；
D, fluid is measured in inner and outer pipe by the first pressure tap, the second pressure tap and third pressure tap by differential pressure transmitter
Pressure difference, and institute's measured data is sent to data processing unit through data acquisition unit；
E, data processing unit is according to pressure difference of the fluid received in inner and outer pipe and the near-infrared after fluid absorbs
The light intensity of light calculates each phase flow rate in biphase gas and liquid flow.
7. the method for measurement biphase gas and liquid flow flow according to claim 6, characterized in that calculating gas-liquid in step e
In two phase flow when each phase flow rate, it is first depending on formula (1) and calculates gas-liquid total mass flow rate in biphase gas and liquid flow：
In formula (1), ε is the coefficient of expansion, and C is efflux coefficient, and β is Throttling ratio, and D is outer tube diameter, ρgFor the density of two phase flow, Δ
ptpFor the pressure difference in inner and outer pipe measured by differential pressure transmitter in step d；
Secondly the obtained gas-liquid total mass flow rate of formula (1) is modified, the following formula of concrete foundation：
In formula (2), ΦgFor correction factor, WgFor the mass flow of gas phase in two phase flow；
ΦgSpecific formula for calculation be：
Φg=a+bX+cX2 (3)
In formula (3), a, b, c are fitting coefficient, and X is the pressure in step d in inner and outer pipe measured by differential pressure transmitter
Difference；
Then according to the light intensity for the near infrared light after fluid absorbs that near-infrared receiving transducer in step c receives, two are calculated
The thickness h for the liquid that mutually near infrared light is passed through in stream, specific formula for calculation are as follows：
Y=A*exp (B*h) (4)
In formula (4), A, B are coefficient, and the expression formula of y is：
In formula (5), I is the light intensity for the near infrared light after fluid absorbs that near-infrared receiving transducer receives in step c, I0
The light intensity of near infrared light received by near-infrared receiving transducer when for fluid being not present in outer tube；
The phase content α of liquid phase in two phase flow is calculated according to the thickness h of formula (4) calculated liquidl：
In formula (6), r is the inside radius of outer tube；
Finally according to αlAnd the W in formula (2)gCalculate the mass flow W of liquid phase in two phase flowl, specific formula is as follows：
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| CN106500780B (en) * | 2016-12-28 | 2019-10-25 | 河北大学 | Tubular type fluid flowmeter and flow rate testing methods inside and outside a kind of |
| CN106768097B (en) * | 2016-12-28 | 2019-03-08 | 河北大学 | Tubular type gas flowmeter and flow rate testing methods inside and outside a kind of |
| CN106482795B (en) * | 2016-12-28 | 2019-07-16 | 河北大学 | Pipe type flowmeter and flow rate testing methods inside and outside a kind of |
| CN108562376A (en) * | 2017-12-28 | 2018-09-21 | 中国航发四川燃气涡轮研究院 | A kind of biphase gas and liquid flow gas phase temperature measuring device based on centrifugal separation method |
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| CN110441239B (en) * | 2019-08-06 | 2021-09-21 | 河北大学 | Optical path-adjustable pipeline phase content rate detection system and method |
| CN210741584U (en) * | 2019-08-22 | 2020-06-12 | 无锡洋湃科技有限公司 | Wet gas flow metering device |
| CN110763294B (en) * | 2019-10-29 | 2021-02-05 | 中国电子科技集团公司第四十八研究所 | Double-capacitance two-phase flow parameter measuring instrument and measuring method |
| CN112326604A (en) * | 2020-11-02 | 2021-02-05 | 苏州长光华医生物医学工程有限公司 | System and method for detecting bubbles in liquid path of full-automatic chemiluminescence immunoassay analyzer |
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