CN105890693A - Gas-liquid two-phase flow phase holdup and separate phase flow rate detection device and detection method - Google Patents

Gas-liquid two-phase flow phase holdup and separate phase flow rate detection device and detection method Download PDF

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Publication number
CN105890693A
CN105890693A CN201610383855.6A CN201610383855A CN105890693A CN 105890693 A CN105890693 A CN 105890693A CN 201610383855 A CN201610383855 A CN 201610383855A CN 105890693 A CN105890693 A CN 105890693A
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fluid
inner tube
outer tube
phase
flow
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CN105890693B (en
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方立德
李婷婷
韦子辉
刘霜
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Hebei University
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Hebei University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F7/00—Volume-flow measuring devices with two or more measuring ranges; Compound meters
    • G01F7/005—Volume-flow measuring devices with two or more measuring ranges; Compound meters by measuring pressure or differential pressure, created by the use of flow constriction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties

Abstract

The invention provides a gas-liquid two-phase flow phase holdup and a separate phase flow rate detection device and detection method. The device comprises an outer tube, an inner tube, a differential pressure transmitter, an LCR tester, a data collection unit and a data processing unit. The inner tube is connected in the outer tube in a sleeved mode, the middle of the inner tube is a baffle area, the two ends of the inner tube are circulation areas, fluid outlet holes and fluid inlet holes are formed in the side walls of the circulation areas at the two ends of the inner tube respectively, a to-be-tested fluid enters the inner tube from one circulation area of the inner tube, enters an annular space between the inner tube and the outer tube through the fluid outlet holes and then flows to the other circulation area through the fluid inlet holes, and the phase holdup of two-phase flow can be obtained by measuring a capacitance value of an annular capacitor and combing correlation operation; by combining pressure differences of the fluid at the two ends of the inner tube, the fluid total flow can be obtained, and the separate phase flow rate can be obtained finally. According to the gas-liquid two-phase flow phase holdup and the separate phase flow rate detection device and detection method, the inner tube and the outer tube and a middle fluid forms capacitance, the capacitance value is only related to an intermediate medium, and therefore an influence of flow pattern changes to measurement of the two-phase flow holdup can be weakened.

Description

A kind of gas-liquid two-phase flow containing rate and separate phase flow rate detect device and detection method
Technical field
The present invention relates to a kind of two-phase flow detection device, specifically a kind of gas-liquid two-phase flow containing rate and split-phase Flow detector and detection method.
Background technology
At present, phase content continuous on-line detection method mainly has optical method (laser, optical fiber), electric method, ray method, nuclear-magnetism Resonance method, microwave method etc..
Optical method is divided into again two kinds of methods: optical fiber probe method and intensity modulation method.Optical fiber probe method is mainly by difference Medium has different refractive indexs to light, when measurement medium is through optical fiber probe, optical-electrical converter output signal, obtains local Void fraction information.Intensity modulation method is to detect in pipeline according to pipe-line blending fluid mutually the most different each absorption spectral coverage Phase content.
Electric method realizes split-phase by the change of measurement two-phase mixture electrical properties (such as electrical conductivity and dielectric constant) and contains The measurement of rate.Electric method has simple in construction, fast response time, has Noninvasive and the not advantage such as interference flowing field.
Ray method is to send corresponding X-ray by equipment or multi beam ray is passed through the tube wall of two phase flow, passes through The attenuation degree recording ray finally determines the absorbing state of pipeline, thus determines the flow condition of pipe interior.Ray method Selection for transmitting probe is particularly critical, in addition, selects suitable pipeline material to reduce the pipeline absorption to ray The most critically important.
Nuclear magnetic resonance method utilizes nuclear magnetic resonance principle to measure the nuclear magnetic resonance absorption of liquid phase part, can get voidage, and The provable intensity of NMR signal in the quiescent state is linear with liquid phase content, still can be various under mobility status Voidage is accurately measured under fluidised form.
Microwave method is passed through by the change and measurement microwave signal measuring fluid-mixing dielectric constant the most at microwave frequencies The phase place in-migration that fluid produces realizes the measurement of multiphase flow phase content, and it is good that microwave method has real-time, and certainty of measurement is high, reliability Good, the advantages such as capacity of resisting disturbance is strong, easy operation, but there is limitation, measure oil-water two-phase flow void fraction at present and mainly collect In at low-water-content and high-moisture percentage.
In addition to above-mentioned several measuring methods, the measurement to phase content also has acoustic method, calorifics method, pulse seed to activate Method, radioactive-tracer method, optical particle tracer method etc..Although various methods have some to apply in some specific occasion, but totally From the point of view of, owing to the complexity of two phase flow and the change of the multiformity of two phase flow operating mode, especially two phase flow pattern are to relevant There is very important impact in the measurement of parameter, finally affects the measurement of phase content, therefore, two phase flow phase content, flow measurement Problem is at present still without being well solved.
Summary of the invention
An object of the present invention is just to provide a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection device, this detection Device can accurately measure phase content and the flow of each phase in biphase gas and liquid flow, and testing result is affected very by variations in flow patterns Little.
The two of the purpose of the present invention are just to provide a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection method, and using should Method can accurately measure phase content and the flow of each phase in biphase gas and liquid flow without two phase flow carries out separation.
An object of the present invention is achieved in that a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection device, Including:
Outer tube, for the round straight tube structure of hollow；
Inner tube, cross-under is in the inner chamber of described outer tube, and the axial line of said inner tube overlaps with the axial line of described outer tube, institute The two ends stating inner tube are stretched out from the two of described outer tube ends respectively；Said inner tube includes that middle part does not allow biphase gas and liquid flow to flow through Baffle area and two ends allow the Circulation Area flow through of biphase gas and liquid flow, two Circulation Areas are equal with the position that described baffle area connects It is positioned at described outer tube and two ends respectively close to described outer tube；The Circulation Area at said inner tube two ends is respectively fluid and flows into District and fluid flow out district, and the described fluid in described outer tube flows into and has fluid outflow hole, at described outer tube on the sidewall in district Interior described fluid flows out and has fluid ostium on the sidewall in district；Described fluid outside described outer tube flows on the sidewall in district Having the first pressure tap, the described fluid outside described outer tube flows out and has the second pressure tap on the sidewall in district；Measure gas-liquid two When flowing mutually, treat that fluid measured initially enters the fluid of inner tube and flows in district, after enter between inner tube and outer tube through fluid outflow hole Annular space in, finally entered the fluid of inner tube by fluid ostium and flow out in district；Fluid ring between inner tube and outer tube In shape space during flowing, inner tube, outer tube and fluid between the two collectively form an annular capacitor；
LCR tester, connects with described outer tube, said inner tube and data acquisition unit respectively, is used for measuring described annular The capacitance of electric capacity；
Differential pressure transmitter, connects with described first pressure tap, described second pressure tap and data acquisition unit respectively, is used for Measure the fluid pressure differential at inner tube two ends；
Data acquisition unit, connects with described LCR tester, described differential pressure transmitter and data processing unit respectively, uses In capacitance value data and the fluid differential pressure data at inner tube two ends of the described annular capacitor of collection, and the data that will collect Send to data processing unit；And
Data processing unit, connects with described data acquisition unit, for calculating gas-liquid two-phase according to the data received The phase content of each phase and flow in stream.
Two ends of described outer tube are connected with the tube wall of said inner tube by flange respectively.
Described fluid outflow hole is four, and four fluid outflow hole are distributed on described fluid and flow into the same horizontal stroke of district's sidewall On cross section；Described fluid ostium is four, and four fluid ostiums are distributed on described fluid and flow out the same horizontal stroke of district's sidewall On cross section.
The hole area sum of four fluid outflow hole is equal or slightly larger than described fluid and flows into the area of section of district's inner chamber；Four The hole area sum of individual fluid ostium is equal or slightly larger than described fluid and flows out the area of section of district's inner chamber.
The baffle area of said inner tube is the hollow structure that solid construction or two ends have baffler.
Inwall at described outer tube is provided with insulating barrier.
The present invention, by arranging the inner and outer tubes of mutually socket, makes fluid flow into from one end of inner tube, then by interior tube side The fluid outflow hole of wall flows in the annular space between inner tube and outer tube, is flow back into by the fluid ostium of inner tube sidewall afterwards In inner tube, and flowed out by the other end of inner tube.Inner tube, outer tube and fluid between the two constitute an annular capacitor；Specifically: Inner and outer tubes constitute two electrodes, and form detection electrostatic field between two electrodes, when two phase flow fluid is by two electricity During electrostatic field between pole, owing to gas phase is different from liquid phase dielectric constant, two-phase fluid equivalence when therefore phase concentration changes Dielectric constant changes the most therewith；The change of dielectric constant, directly affects the measured value of final electric capacity.By measure annular electric capacity Capacitance, can calculate the dielectric constant of fluid, and then can draw the phase content of each phase in fluid.Again by fluid at inner tube two ends Pressure differential, fluid total flow can be calculated.In conjunction with fluid total flow and phase content, each separate phase flow rate can be obtained.
The present invention utilizes inside and outside pipeline and central fluid to form electric capacity, and capacitance is only and intermediate medium (i.e. two phase flow stream Body) relevant, therefore reduce the impact that two phase flow phase content is measured by variations in flow patterns, the measurement for gas-liquid two-phase flow containing rate carries Supply a kind of new thinking.
The two of the purpose of the present invention are achieved in that a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection method, Comprise the steps:
A, inner tube is set within the outer tube；Described outer tube is the round straight tube structure of hollow, and the axial line of described outer tube is with described The axial line of inner tube overlaps, and the two ends of said inner tube are stretched out from the two of described outer tube ends respectively；Said inner tube includes middle part Do not allow baffle area that biphase gas and liquid flow flows through and the Circulation Area that two ends allow biphase gas and liquid flow to flow through, two Circulation Areas and institute State in the position that baffle area connects is respectively positioned on described outer tube and respectively close to two ends of described outer tube；Said inner tube two ends Circulation Area is respectively fluid and flows into district and fluid outflow district, and the described fluid in described outer tube flows into and has stream on the sidewall in district Body tap hole, the described fluid in described outer tube flows out and has fluid ostium on the sidewall in district；Institute outside described outer tube Stating fluid to flow into and have the first pressure tap on the sidewall in district, described fluid outside described outer tube flows out and has the on the sidewall in district Two pressure taps；
B, make to treat that fluid measured initially enters the fluid of inner tube and flows in district, after enter inner tube and outer tube through fluid outflow hole Between annular space in, finally entered the fluid of inner tube by fluid ostium and flow out in district；Fluid is between inner tube and outer tube Annular space in flowing time, inner tube, outer tube and fluid between the two collectively form an annular capacitor；
C, capacitance by LCR tester measure annular electric capacity, surveyed capacitance sends to data through data acquisition unit Processing unit；
D, by differential pressure transmitter measure the fluid pressure differential at inner tube two ends, institute's measuring pressure difference through data acquisition unit send To data processing unit；
E, data processing unit calculate phase content and the flow of each phase in biphase gas and liquid flow according to the data received.
Step e is specifically:
E1, first according to fluid in the total flow of the pressure difference meter fluid operator at inner tube two ends, computing formula is as follows:
Q v = KS a Δ P ρ - - - ( 1 )
In formula (1), QvFor the fluid total flow in pipeline, K is efflux coefficient, SaFor the area of section of interior tube cavity, Δ P For the fluid pressure differential at inner tube two ends, ρ is fluid density；
Secondly e2, the compound dielectric of biphase gas and liquid flow is solved according to the capacitance of annular capacitor；The electricity of annular capacitor Relational expression between capacitance and the compound dielectric of fluid is:
C = 2 πϵϵ 0 L l n R r - - - ( 2 )
In formula (2), the capacitance of the C annular capacitor by being surveyed, ε is the compound dielectric of fluid, ε0For vacuum dielectric Constant, L is the length of outer tube, and R is the inside radius of outer tube, and r is the outer radius of inner tube；
E3, compound dielectric ε according to fluid, calculate the phase content of each phase in fluid, and computing formula is as follows:
ε=m εlβl+nεgβg (3)
βl+βg=1 (4)
In formula (3) and formula (4), βlFor liquid phase phase content, βgFor gas phase phase content, εlNormal for the dielectric of fluid during neat liquid Number, εgFor the dielectric constant of fluid during pure gas, m and n is coefficient；
E4, calculate the flow of each split-phase in fluid according to following two formula；
Qg=Qv×βg (5)
Ql=Qv×βl (6)
Q in formula (5)gFor the flow of gas phase in fluid, Q in formula (6)lFor the flow of liquid phase in fluid.
The present invention utilizes inner and outer pipes effusion meter and electric capacity relative theory, it is achieved that itself measuring, no two phase flow The flow field of interference fluid self, and it is capable of on-line monitoring.Use inside and outside pipeline can form electric capacity, separately with central fluid Outer liquid phase there are differences with gas phase dielectric constant, utilizes the difference of fluid dielectric constant to obtain different capacitance signals, recycling Related operation can obtain the phase content of two phase flow, and the measurement for gas-liquid two-phase flow containing rate, flow provides a kind of new method.
Accompanying drawing explanation
Fig. 1 is gas-liquid two-phase flow containing rate and the structural representation of separate phase flow rate detection device in the present invention.
Fig. 2 is the sectional view of four fluid outflow hole opened in Fig. 1 inner tube.
Detailed description of the invention
Embodiment 1, a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection device.
As it is shown in figure 1, outside gas-liquid two-phase flow containing rate provided by the present invention and separate phase flow rate detection device specifically include Pipe 1, inner tube 2, LCR tester, differential pressure transmitter, data acquisition unit and data processing unit.
Outer tube 1 is the round straight tube structure of hollow；Inner tube 2 cross-under in the inner chamber of outer tube 1, the axial line of inner tube 2 and outer tube 1 Axial line coincide；The length of inner tube 2 is more than the length of outer tube 1, and the two ends of inner tube 2 are respectively from two ends of outer tube 1 Stretch out.The external diameter of inner tube 2 is less than the internal diameter of outer tube 1, thus forms ring between the medial wall of the lateral wall of inner tube 2 and outer tube 1 The cavity of shape.Two ends of outer tube 1 are connected by the lateral wall of flange with inner tube 2 respectively.
Inner tube 2 includes baffle area and the Circulation Area at two ends at middle part, and baffle area does not allow biphase gas and liquid flow to flow through Region, Circulation Area is the region allowing biphase gas and liquid flow to flow through.The baffle area of inner tube 2 could be arranged to solid construction, it is also possible to It is set to two ends and there is the hollow structure of baffler.The Circulation Area of inner tube 2 is the tubular structure of hollow, and each Circulation Area all has One opening, the other end connects with baffle area.The opening of two Circulation Areas reaches the outside of outer tube 1, two circulations respectively In the position that district connects with baffle area is respectively positioned on outer tube 1 and respectively close to two ends of outer tube 1, say, that: baffle area Length is less than the length of outer tube 1, and baffle area is entirely located in outer tube 1, and the two ends of baffle area are respectively close to two ends of outer tube 1 Portion, generally, makes the center of baffle area and the center superposition of outer tube 1 by setting.
The Circulation Area at inner tube 2 two ends is respectively fluid and flows into district (inner tube 2 left end region in figure) and fluid outflow district (in figure Inner tube 2 right end region).Fluid in outer tube 1 flows into and has four fluid outflow hole 3 on the sidewall in district, and four fluids flow out Hole 3 is distributed on fluid and flows on the same cross section of district's sidewall, as in figure 2 it is shown, Fig. 2 shows on same cross section four The distribution situation of fluid outflow hole；Fluid in outer tube 1 flows out and has four fluid ostiums 4, four streams on the sidewall in district Body ostium is distributed on fluid and flows out on the same cross section of district's sidewall.Fluid outflow hole 3 away from one end, baffle area (i.e. away from fluid stream Portal 3 nearer one end) distance with fluid ostium 4 away from the baffle area other end (i.e. away from one end that fluid ostium 4 is nearer) Distance equal, both of which can be 20mm～30mm, the most both can ensure that at fluid outflow hole 3 and fluid ostium 4 not Whirlpool can be caused because of a large amount of accumulation fluids, inner tube 2 tube wall pressure can be reduced again.The hole area of four fluid outflow hole 3 The most equal, the hole area of four fluid ostiums 4 is the most equal, and the hole area of single fluid outflow hole 3 flows into single fluid The hole area in hole 4 is equal.The internal diameter that fluid flows into district is identical with the internal diameter that fluid flows out district, the face, hole of four fluid outflow hole 3 Long-pending sum is equal or slightly larger than fluid and flows into the area of section (i.e. cross-sectional area) of district's inner chamber, the hole of four fluid ostiums 4 Area sum is equal or slightly larger than fluid and flows out the area of section of district's inner chamber, broken to prevent during measuring fluid phase content Bad fluid model.
When measuring biphase gas and liquid flow, first make to treat that fluid measured gravity flow body flows into district's opening and enters the fluid inflow of inner tube 2 In district (fluid flow direction direction as shown by arrows in FIG.), after enter between inner tube 2 and outer tube 1 through fluid outflow hole 3 In annular space, flow forward in annular space, finally entered in the fluid outflow district of inner tube 2 by fluid ostium 4, by flowing Body flows out the opening in district and flows out inner tube 2.In fluid annular space between inner tube 2 and outer tube 1 during flowing, inner tube 2, outer tube 1 and fluid between the two be collectively forming an annular capacitor.Inwall at outer tube 1 is provided with certain thickness insulating barrier, with Prevent the external electrical field interference to electric capacity.Owing to gas phase is different with the dielectric constant of liquid phase, therefore, gas phase and liquid phase two in fluid The change (i.e. the change of phase content) of person's ratio can cause the compound dielectric of fluid different, and the compound dielectric of fluid Directly affecting again the capacitance of annular capacitor, therefore, capacitance measured in the case of fluid phase content difference is the most different. The phase content of corresponding biphase gas and liquid flow is i.e. can get by measuring capacitance signal.Two test probes of LCR tester are respectively Connect with outer tube 1 lateral wall and inner tube 2 lateral wall (when connecting with inner tube 2 lateral wall, can be with the inner tube 2 being positioned at outside outer tube 1 Lateral wall connects), the LCR tester capacitance by two test probe measure annular electric capacity, and measurement result is sent extremely Data acquisition unit.
Fluid outside outer tube 1 flows into and has the first pressure tap 5 on the sidewall in district, and the fluid outside outer tube 1 flows out district The second pressure tap 6 is had on sidewall；First pressure tap 5 and the second pressure tap 6 are all opened in the positive upper surface of inner tube 2 sidewall.Differential pressure Transmitter connects with first pressure tap the 5, second pressure tap 6 and data acquisition unit respectively, and differential pressure transmitter passes through the first pressure measurement Hole 5 and the second pressure tap 6 gather, measure the fluid pressure differential at inner tube 2 two ends.By the fluid pressure differential at inner tube 2 two ends, The total flow of biphase gas and liquid flow can be drawn in conjunction with correlation formula.
Data acquisition unit connects with LCR tester, differential pressure transmitter and data processing unit respectively, data acquisition unit For gathering capacitance signal and the fluid differential pressure signal at inner tube 2 two ends of annular capacitor, and the signal collected is sent out Deliver to data processing unit.
Data processing unit connects with data acquisition unit, and data processing unit is used for according to the fluid received in inner tube The differential pressure signal at two ends calculates the total flow of biphase gas and liquid flow, and calculates in biphase gas and liquid flow according to the capacitance signal received The phase content of each phase, can calculate each separate phase flow rate in conjunction with total flow and phase content.Specific formula for calculation can be found in following reality Execute described in example.
Embodiment 2, a kind of gas-liquid two-phase flow containing rate and separate phase flow rate detection method.
As it is shown in figure 1, gas-liquid two-phase flow containing rate provided by the present invention and separate phase flow rate detection method include walking as follows Rapid:
A, inner tube 2 is set in outer tube 1.Outer tube 1 is the round straight tube structure of hollow, and inner tube 2 is placed in outer tube 1, inner tube 2 Length is more than the length of outer tube 1, and the two ends of inner tube 2 are stretched out from the two of outer tube 1 ends respectively；The axial line of inner tube 2 and outer tube 1 Axial line overlap.Inner tube 2 include middle part do not allow biphase gas and liquid flow to flow through baffle area and two ends allow biphase gas and liquid flow The Circulation Area flow through, in the position that two Circulation Areas connect with baffle area is respectively positioned on outer tube 1 and respectively close to two ends of outer tube 1 Portion.The Circulation Area at inner tube 2 two ends is respectively fluid and flows into district and fluid outflow district, and the fluid in outer tube 1 flows into district's sidewall Uniformly having four fluid outflow hole 3 on same cross section, the fluid in outer tube 1 flows out on the same cross section of district's sidewall equal Even have four fluid ostiums 4；The fluid outflow hole 3 distance away from one end, baffle area and fluid ostium 4 away from baffle area another The distance of end is equal.Fluid outside outer tube 1 flows into and has the first pressure tap 5 on the sidewall in district, and the fluid outside outer tube 1 flows out The second pressure tap 6 is had on the sidewall in district.
B, as shown by the arrows in Figure 1, makes to treat that fluid measured initially enters the fluid of inner tube 2 and flows in district, after through fluid stream Portal in the annular space between 3 entrance inner tubes 2 and outer tube 1, finally entered the fluid outflow district of inner tube 2 by fluid ostium 4 In.In fluid annular space between inner tube 2 and outer tube 1 during flowing, inner tube 2, outer tube 1 and fluid between the two are common Constitute an annular capacitor.
C, by the LCR tester capacitance by the sidewall measure annular electric capacity of outer tube 1 and inner tube 2, surveyed capacitance warp Data acquisition unit sends to data processing unit.
D, measured the fluid pressure at inner tube 2 two ends by differential pressure transmitter by the first pressure tap 5 and the second pressure tap 6 Difference, institute's measuring pressure difference sends to data processing unit through data acquisition unit.
E, data processing unit calculate phase content and the flow of each phase in biphase gas and liquid flow, tool according to the data received It is as follows that body calculates process:
E1, first according to fluid in the total flow of the pressure difference meter fluid operator at inner tube 2 two ends, computing formula is as follows:
Q v = KS a Δ P ρ - - - ( 1 )
In formula (1), QvFor fluid total flow (unit: the m in pipeline3/ s), K is efflux coefficient, SaFor inner tube 2 inner chamber Area of section (unit: m2), Δ P is the fluid pressure differential (unit: Pa) at inner tube 2 two ends, and ρ is fluid density (unit: kg/ m3)。
K is by experiment predetermined value.Experimentation is: make known phase content, the biphase gas and liquid flow of flow flows into In the detection device of the present invention, specifically: by the gas in a road pipeline and the liquid pools in a road pipeline to together with, formed Biphase gas and liquid flow, is respectively mounted flow detection table (belonging to standard scale) on gas pipeline and fluid pipeline, regulates gas pipeline Make gas, liquid to certain flow velocity with the valve on fluid pipeline, gather fluid at inner tube two ends by differential pressure transmitter Pressure differential △ P (can survey many groups), and the flow detection table by installing on pipeline reads corresponding volume flow simultaneously, can obtain Volume total flow Q of two phase flow in inner tubev(also can measure by installing standard scale on inner pipe).Tube cavity in experiment Cross section SaIt is known that the density p of tested two phase flow fluid is it is known that combine many group pressure differential △ P, total flow Qv, intended by data Conjunction can draw efflux coefficient K.
Secondly e2, the compound dielectric of biphase gas and liquid flow is solved according to the capacitance of annular capacitor；The electricity of annular capacitor Relational expression between capacitance and the compound dielectric of fluid is:
C = 2 πϵϵ 0 L l n R r - - - ( 2 )
In formula (2), the capacitance of the C annular capacitor by being surveyed, ε is the compound dielectric of fluid, ε0For vacuum dielectric Constant, L is the length of outer tube, and R is the inside radius of outer tube, and r is the outer radius of inner tube.
E3, compound dielectric ε according to fluid, calculate the phase content of each phase in fluid, and computing formula is as follows:
ε=m εlβl+nεgβg (3)
βl+βg=1 (4)
In formula (3) and formula (4), βlFor liquid phase phase content, βgFor gas phase phase content, εlNormal for the dielectric of fluid during neat liquid Number, εgFor the dielectric constant of fluid during pure gas, m and n is coefficient.
In fluid, the dielectric constant of gas phase and liquid phase has larger difference, therefore, it can first pass through full liquid, full QI excess is tested, Determine the concrete dielectric constant of liquid phase and gas phase.
In formula (3), Coefficient m and n are obtained by experimental fit, and concrete fit procedure is: make known phase content, stream The biphase gas and liquid flow of amount flows in the detection device of the present invention, by the collection of LCR tester, the capacitance of measure annular electric capacity, number According to processing unit according to the capacitance recorded, the compound dielectric ε of fluid can be obtained in conjunction with formula (2), flow during neat liquid The DIELECTRIC CONSTANT ε of bodylKnown (recording according to the experiment of pure liquid), the DIELECTRIC CONSTANT ε of fluid during pure gasgIt is also known that (according to pure QI excess Test obtains), the most known gas phase, phase content (the i.e. β of liquid phaselAnd βgThe most known), by the compound dielectric ε of fluid, pure liquid The DIELECTRIC CONSTANT ε of fluid during bodyl, pure gas time fluid DIELECTRIC CONSTANT εg, liquid phase phase content βlWith gas phase phase content βgFive Amount, can simulate corresponding computing formula, obtain the occurrence of m and n.
E4, calculate the flow of each split-phase in fluid according to following two formula；
Qg=Qv×βg (5)
Ql=Qv×βl (6)
Q in formula (5)gFor the flow of gas phase in fluid, Q in formula (6)lFor the flow of liquid phase in fluid.

Claims (8)

1. gas-liquid two-phase flow containing rate and a separate phase flow rate detection device, is characterized in that, including:
Outer tube, for the round straight tube structure of hollow；
Inner tube, cross-under is in the inner chamber of described outer tube, and the axial line of said inner tube overlaps with the axial line of described outer tube, described interior The two ends of pipe are stretched out from the two of described outer tube ends respectively；Said inner tube includes the resistance that middle part does not allow biphase gas and liquid flow to flow through Septal area and two ends allow the Circulation Area that biphase gas and liquid flow flows through, and the position that two Circulation Areas connect with described baffle area is respectively positioned on In described outer tube and respectively close to two ends of described outer tube；The Circulation Area at said inner tube two ends be respectively fluid flow into district and Fluid flows out district, and the described fluid in described outer tube flows into and has fluid outflow hole, in described outer tube on the sidewall in district Described fluid flows out and has fluid ostium on the sidewall in district；Described fluid outside described outer tube flows into and has on the sidewall in district First pressure tap, the described fluid outside described outer tube flows out and has the second pressure tap on the sidewall in district；Measure biphase gas and liquid flow Time, treat that fluid measured initially enters the fluid of inner tube and flows in district, after enter the ring between inner tube and outer tube through fluid outflow hole In shape space, finally entered by fluid ostium in the fluid outflow district of inner tube；Fluid annular between inner tube and outer tube is empty During interior flowing, inner tube, outer tube and fluid between the two collectively form an annular capacitor；
LCR tester, connects with described outer tube, said inner tube and data acquisition unit respectively, is used for measuring described annular capacitor Capacitance；
Differential pressure transmitter, connects with described first pressure tap, described second pressure tap and data acquisition unit respectively, is used for measuring Fluid is in the pressure differential at inner tube two ends；
Data acquisition unit, connects with described LCR tester, described differential pressure transmitter and data processing unit respectively, is used for adopting Collect capacitance value data and the fluid differential pressure data at inner tube two ends of described annular capacitor, and the data collected are sent To data processing unit；And
Data processing unit, connects with described data acquisition unit, for calculating in biphase gas and liquid flow according to the data received The phase content of each phase and flow.
Gas-liquid two-phase flow containing rate the most according to claim 1 and separate phase flow rate detection device, is characterized in that, described outer tube Two ends connected with the tube wall of said inner tube by flange respectively.
Gas-liquid two-phase flow containing rate the most according to claim 1 and separate phase flow rate detection device, is characterized in that, described fluid Tap hole is four, and four fluid outflow hole are distributed on described fluid and flow on the same cross section of district's sidewall；Described fluid Ostium is four, and four fluid ostiums are distributed on described fluid and flow out on the same cross section of district's sidewall.
Gas-liquid two-phase flow containing rate the most according to claim 3 and separate phase flow rate detection device, is characterized in that, four fluids The hole area sum of tap hole is equal or slightly larger than described fluid and flows into the area of section of district's inner chamber；The hole of four fluid ostiums Area sum is equal or slightly larger than described fluid and flows out the area of section of district's inner chamber.
Gas-liquid two-phase flow containing rate the most according to claim 1 and separate phase flow rate detection device, is characterized in that, said inner tube Baffle area be the hollow structure that solid construction or two ends have baffler.
Gas-liquid two-phase flow containing rate the most according to claim 1 and separate phase flow rate detection device, is characterized in that, outside described The inwall of pipe is provided with insulating barrier.
7. gas-liquid two-phase flow containing rate and a separate phase flow rate detection method, is characterized in that, comprise the steps:
A, inner tube is set within the outer tube；Described outer tube is the round straight tube structure of hollow, the axial line of described outer tube and said inner tube Axial line overlap, the two ends of said inner tube are stretched out from the two of described outer tube ends respectively；Said inner tube includes that middle part does not permits Permitted the baffle area flow through of biphase gas and liquid flow and Circulation Area that two ends allow biphase gas and liquid flow to flow through, two Circulation Areas and described resistance The position that septal area connects is respectively positioned in described outer tube and respectively close to two ends of described outer tube；The circulation at said inner tube two ends District is respectively fluid and flows into district and fluid outflow district, and the described fluid in described outer tube flows into and has fluid stream on the sidewall in district Portalling, the described fluid in described outer tube flows out and has fluid ostium on the sidewall in district；Described stream outside described outer tube Body flows into and has the first pressure tap on the sidewall in district, and the described fluid outside described outer tube flows out and has the second survey on the sidewall in district Pressure hole；
B, make to treat that fluid measured initially enters the fluid of inner tube and flows in district, after enter between inner tube and outer tube through fluid outflow hole Annular space in, finally entered the fluid of inner tube by fluid ostium and flow out in district；Fluid ring between inner tube and outer tube In shape space during flowing, inner tube, outer tube and fluid between the two collectively form an annular capacitor；
C, capacitance by LCR tester measure annular electric capacity, surveyed capacitance sends to data through data acquisition unit and processes Unit；
D, by differential pressure transmitter measure the fluid pressure differential at inner tube two ends, institute's measuring pressure difference through data acquisition unit send to number According to processing unit；
E, data processing unit calculate phase content and the flow of each phase in biphase gas and liquid flow according to the data received.
Gas-liquid two-phase flow containing rate the most according to claim 7 and separate phase flow rate detection method, is characterized in that, step e has Body is:
E1, first according to fluid in the total flow of the pressure difference meter fluid operator at inner tube two ends, computing formula is as follows:
Q v = KS a Δ P ρ - - - ( 1 )
In formula (1), QvFor the fluid total flow in pipeline, K is efflux coefficient, SaFor the area of section of interior tube cavity, Δ P is stream Body is in the pressure differential at inner tube two ends, and ρ is fluid density；
Secondly e2, the compound dielectric of biphase gas and liquid flow is solved according to the capacitance of annular capacitor；The capacitance of annular capacitor And the relational expression between the compound dielectric of fluid is:
C = 2 πϵϵ 0 L l n R r - - - ( 2 )
In formula (2), the capacitance of the C annular capacitor by being surveyed, ε is the compound dielectric of fluid, ε0For permittivity of vacuum, L For the length of outer tube, R is the inside radius of outer tube, and r is the outer radius of inner tube；
E3, compound dielectric ε according to fluid, calculate the phase content of each phase in fluid, and computing formula is as follows:
ε=m εlβl+nεgβg (3)
βl+βg=1 (4)
In formula (3) and formula (4), βlFor liquid phase phase content, βgFor gas phase phase content, εlFor the dielectric constant of fluid, ε during neat liquidg For the dielectric constant of fluid during pure gas, m and n is coefficient；
E4, calculate the flow of each split-phase in fluid according to following two formula；
Qg=Qv×βg (5)
Ql=Qv×βl (6)
Q in formula (5)gFor the flow of gas phase in fluid, Q in formula (6)lFor the flow of liquid phase in fluid.
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