CN204514400U - A kind of compact gas-liquid stratified flow measurement mechanism - Google Patents

Abstract

The utility model relates to gas-liquid stratified flow fields of measurement, be specifically related to a kind of compact gas-liquid stratified flow measurement mechanism, be connected with upstream conveyance conduit, upstream flange, upstream damping corrugated tube, vibrating tube, downstream damping corrugated tube, downstream flange and delivery duct downstream road in turn, the outside ring set of vibrating tube has straight barrel type shell; The centre place of the upper surface of described vibrating tube is provided with electric and magnetic oscillation driver, the centre place of lower surface is provided with 2 symmetrical vibrating detectors, and upstream vibrating detector is equal to the distance of downstream flange to the Distance geometry downstream vibrating detector of upstream flange; The input end of described electric and magnetic oscillation driver is connected with the output terminal of amplifier with signal generator, and output terminal is connected with the input end of vibrating tube.Advantage: reduce costs, achieves compact structure and arranges, realizes undisturbed and measures, thus substantially increase the measuring accuracy of flow parameter.

Description

A kind of compact gas-liquid stratified flow measurement mechanism

Technical field

The utility model relates to gas-liquid stratified flow fields of measurement, be specifically related to a kind of compact gas-liquid stratified flow measurement mechanism.

Background technology

Gas-liquid stratified flow refers to the flow pattern that the two-phase flow gas blanket in horizontal pipe be made up of gas and liquid flows on liquid level; The phase that so-called two-phase flow refers to material in flow system is two.In oilfield exploitation, the biphase gas and liquid flow mostly being low liquid holdup studied, namely " moisture ", its measurement comprises from oil field well exploitation, and oil gas transports, and has embodiment in the oil field projects such as purification.

Therefore, realize the on-line measurement of gas-liquid stratified flow, have very large facilitation to multiple industry such as oil field and water conservancy.

Existing gas-liquid stratified flow measuring method is mainly divided into following several:

1, separate type measuring method: flow through separator by gas-liquid two-phase, is divided into gas phase single-phase flow and single liquid phase stream, and measures by single-phase flow instrument.

In the engineering practice of Oil Field, because oil itself is complicated polyphasic flow mixed liquor, we want the single-phase flow accurate parameters obtaining gas phase and liquid phase, just must adopt separate type measuring method.But such mensuration shortcoming is: separator volume is huge, expensive, consumes energy large and can not on-line measurement be realized.Especially the production law for oil field or gas well is difficult to adapt to.Further, at sea during oil gas platform operations, because job platform is narrow, existing device is also inconvenient to measure.

2, Modern New Technology measuring method: researchist also uses much new technology both at home and abroad, such as laser Doppler vibration, holographic technique and Computerized Information Processing Tech etc., but because new technology is immature, cost is also high, and fails to be widely used in commercial measurement.

3, traditional single-phase flow gauge adds two-phase flow measurement model measurement method: usually moisture is reduced to low liquid holdup biphase gas and liquid flow in a lot of measurement technology research now, and its measurement problem is summed up as the two-parameter measurement problem of low liquid holdup biphase gas and liquid flow.Domestic and international researchist is mainly devoted to the research that traditional single-phase flow instrument and two-phase flow parameter measurement model combine, single-phase flow measuring principle is combined with biphase gas and liquid flow measure theory and sets up low liquid holdup gas-liquid two-phase flow model and single-phase flow measurement result is revised, realize the two-parameter measurement of biphase gas and liquid flow.

Current employing the method is generally utilize single-phase flow measurement instrument (as utilized Coriolis flowmeter) to obtain a relative measurement to add Ratio for error modification to obtain flow value, but the error that such flow value result exists is very large.Because single-phase flow instrument is inherently quite inaccurate for the flow measurement of biphase gas and liquid flow, resultant error just can be caused larger.Such as, the measurement of Coriolis flowmeter is only measure more accurate to the liquid phase flow part in two-phase flow, and the measuring error of gas phase portion can be very large, causes the numerical error that obtains just very large.The gas phase portion of biphase gas and liquid flow, in order to reduce such error, is carried out multi-point sampling by more existing technician, and the measurement result of comprehensive for these samples Coriolis flowmeter is carried out matching, but the resultant error finally obtained is still very large.Be because the result of sampling only represent little a part of situation, and along with the change of time or environment, the fluidised form of two-phase flow can affect by very large, and error also can strengthen further.

To sum up, a kind of effective gas-liquid stratified flow measurement mechanism is not also had can to solve above-mentioned all deficiencies at present.

Utility model content

According to the deficiencies in the prior art, the utility model provides a kind of structure simple, coriolis effect and ultrasonic velocity measurement principle are combined, ultrasonic probe and vibrating tube are combined, achieve compact structure to arrange, reduce monitoring cost, compact gas-liquid stratified flow measurement mechanism applied widely.

The technical solution of the utility model is: a kind of compact gas-liquid stratified flow measurement mechanism, be connected with upstream conveyance conduit, upstream flange, upstream damping corrugated tube, vibrating tube, downstream damping corrugated tube, downstream flange and delivery duct downstream road in turn, the outside ring set of vibrating tube has straight barrel type shell; The centre place of the upper surface of described vibrating tube is provided with electric and magnetic oscillation driver, the centre place of lower surface is provided with 2 symmetrical vibrating detectors, and upstream vibrating detector is equal to the distance of downstream flange to the Distance geometry downstream vibrating detector of upstream flange; The input end of described electric and magnetic oscillation driver is connected with the output terminal of amplifier with signal generator, and output terminal is connected with the input end of vibrating tube.

Preferred version is as follows:

The coupling of case body inside surface is provided with the relative ultrasonic probe of 1-4 group horizontal axis position.

The coupling of vibrating tube outside surface is provided with the relative ultrasonic probe of 1-4 group horizontal axis position.

Shell inner surface coupling is provided with the relative ultrasonic probe of 1-4 group horizontal axis position and the relative ultrasonic probe of 1-4 group vertical axis position.The mode of installing according to ultrasonic probe, the number of position and probe can carry out the design of multiple device, multiple choices mode can be had like this in the engineer applied of reality, adaptive surface is wider, structure is simple, intuitive more, compact measurement model had both saved cost and volumetric spaces, reduce again the interference of fluid flow state to the full extent, thus improve the measuring accuracy of flow parameter, thus undisturbed measurement can be realized.

During concrete operations test, vibrating tube inside is gas-liquid stratified flow, and the first half is gas, and the latter half is liquid.The horizontal range angle (acute angle) that to be L, θ be between ultrasonic wave propagation path and V between ultrasonic probe, A _gand A _lbe respectively the conduit cross-sectional area occupied by gas phase and liquid phase, on ultrasonic wave propagation path, the average velocity of fluid is v, if ultrasound wave downstream propagation times is T ₁, the adverse current travel-time is T ₂, H is the spacing in ultrasonic probe pipeline direction, the ultrasonic propagation velocity that c is fluids within pipes flow velocity when being zero.Wherein the total cross-sectional area of pipeline is A, and pipeline interior diameter is D, provides formula 1, formula 2 and formula 3 by ultrasonic flow meter principle of work:

t ₁＝L/(C+V cosθ) 1

t ₂＝L/(C-V cosθ) 2

$V=\frac{D}{\sin \left(2\mathrm{\θ}\right)}(\frac{1}{t_1}-\frac{1}{t_2})---3$

If x is gas phase quality contain rate, the computing formula of x is formula 4:

$x=\frac{W_G}{W_G+W_L}---4$

If α is gaseous phase volume cross section contain rate, the computing formula of α is formula 5:

$\mathrm{\α}=\frac{A_G}{A}=\frac{A_G}{A_G+A_L}---5$

Under setting physical condition, real gas phase volume flow rate is Q _g, the measurement output valve of ultrasonic flow meter is Q _gU,actual gas density is ρ _g, then there is following computing formula 6:

$\frac{Q_{\mathrm{GU}}}{Q_G}=\frac{V*A}{V*A_G}=\frac{1}{\mathrm{\α}}---6$

Definition from formula 4 and 5 and Slip Ratio S: α can be expressed as the function of x, as shown in Equation 7:

$\mathrm{\α}=\frac{1}{1+\left(\frac{1-x}{x}\right)\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)S}---7$

Wherein S is the Slip Ratio between gas-liquid two-phase, is defined as formula 8:

$S=\frac{w_G}{w_L}---8$

Wherein w _gand w _lbe respectively the average flow velocity of gas phase and liquid phase, Slip Ratio S is calculated by one of formula 10 to formula 16, wherein ρ _gfor the density of gas, its computing formula is formula 9:

${\mathrm{\ρ}}_G={\mathrm{\ρ}}_{G0}*\frac{P}{P_0}*\frac{T_0}{T}---9$

Wherein, ρ _g0for the density of gas under the status of criterion, P ₀=101325Pa, T ₀=293.15K, P and T are respectively the actual measured value of pressure unit and temperature transmitter; ρ _lfor the density of liquid phase fluid, μ _gand μ _lbe respectively the kinetic viscosity of gas phase and liquid phase fluid, ρ in actual measurement situation _l, μ _gand μ _lfor known quantity:

Formula 10: $S=0.28{\left(\frac{1-x}{x}\right)}^{-0.36}{\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-0.64}{\left(\frac{{\mathrm{\μ}}_L}{{\mathrm{\μ}}_G}\right)}^{0.07}$

Formula 11: $S={\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-1/3}$

Formula 12: $S={\left(\frac{1-x}{x}\right)}^{-0.26}{\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-0.35}{\left(\frac{{\mathrm{\μ}}_L}{{\mathrm{\μ}}_G}\right)}^{0.13}$

Formula 13: $S={[1-x(1-\frac{{\mathrm{\ρ}}_L}{{\mathrm{\ρ}}_G})]}^{0.5}$

Formula 14: $S=2.22{\left(\frac{1-x}{x}\right)}^{-0.35}{\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-0.35}$

Formula 15: $S=0.18{\left(\frac{1-x}{x}\right)}^{-0.4}{\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-0.67}{\left(\frac{{\mathrm{\μ}}_L}{{\mathrm{\μ}}_G}\right)}^{0.07}$

Formula 16: $S=0.26{\left(\frac{1-x}{x}\right)}^{-0.33}{\left(\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}\right)}^{-0.67}$

Described low liquid holdup gas-liquid two-phase flow measuring method, wherein, the described low liquid holdup gas-liquid two-phase flow measurement submodel based on coriolis effect selects different computing formula according to the scope of Lockhart-Martinelli parameter, and Lockhart-Martinelli parameter expression is:

Formula 17: $X=\frac{1-x}{x}\sqrt{\frac{{\mathrm{\ρ}}_G}{{\mathrm{\ρ}}_L}}$

When Lockhart-Martinelli parameter is 0<x≤0.3, the described low liquid holdup gas-liquid two-phase flow measurement submodel employing computing formula based on coriolis effect is:

Formula 18:W _c=K ₁* X+K ₂* W _g+ K ₃

Wherein W _cfor the mass flow measurement output valve of Coriolis flowmeter; When Lockhart-Martinelli parameter is 0.3<x≤1.1, the described low liquid holdup gas-liquid two-phase flow measurement submodel employing computing formula based on coriolis effect is:

Formula 19: ρ _c=K ₄* X+K ₅

Wherein ρ _cfor the density measure output valve of Coriolis flowmeter.In above-mentioned formula, K ₁, K ₂and K ₃and K ₄and K ₅obtain by carrying out process to experimental data.

Described low liquid holdup gas-liquid two-phase flow measuring method, wherein, have two kinds of different forms according to the scope various combination measurement model of Lockhart-Martinelli parameter, when Lockhart-Martinelli parameter is 0<x≤0.3, one of multiple measurement model is as follows:

Formula 20: $\left\{\begin{array}{c}{W}_G=\frac{{\mathrm{\&rho;}}_G*Q_{\mathrm{GU}}}{1+\left(\frac{1-x}{x}\right)*\left(\frac{{\mathrm{\&rho;}}_G}{{\mathrm{\&rho;}}_L}\right)*S}\\ W_C=K_1*X+K_2*W_G+K_3\end{array}\right.$

Two unknown numbers are had, i.e. gas phase mass flow W in formula 20 _gwith gas phase quality containing rate x, first draw gas phase mass flow W by formula 20 _gwith gas phase quality containing rate x, then the W that will draw _gsubstitute into the computing formula 4 of x with x, thus solve liquid phase quality flow W _l;

When Lockhart-Martinelli parameter is 0.3<x≤1.1, obtain multiple measurement model two:

Formula 21: $\left\{\begin{array}{c}{W}_G=\frac{{\mathrm{\&rho;}}_G*Q_{\mathrm{GU}}}{1+\left(\frac{1-x}{x}\right)*\left(\frac{{\mathrm{\&rho;}}_G}{{\mathrm{\&rho;}}_L}\right)*S}\\ {\mathrm{\&rho;}}_C=K_4*X+K_5\end{array}\right.$

Two unknown numbers are had, i.e. gas phase mass flow W in formula 21 _gwith gas phase quality containing rate x, first by drawing gas phase mass flow W in solution formula 21 _gwith gas phase quality containing rate x, then the W that will draw _gsubstitute into the computing formula 4 of x with x, thus calculate liquid phase quality flow W _l.

To sum up, the advantage of this device have following some:

1, without the need to biphase gas and liquid flow is separated, avoid the use of expensive separation vessel, greatly reduce monitoring cost;

2, coriolis effect and ultrasonic velocity measurement principle are combined, ultrasonic probe and vibrating tube are combined, achieve compact structure and arrange, save monitoring space;

3, device building block is straight length, reduces the interference of fluid flow state to the full extent, realizes undisturbed and measures, thus substantially increase the measuring accuracy of flow parameter.

Accompanying drawing explanation

Fig. 1 is the utility model structural representation;

Fig. 2 is the cross-sectional outer structural representation of the utility model embodiment 1;

Fig. 3 is the cross-sectional outer structural representation of the utility model embodiment 2;

Fig. 4 is the cross-sectional outer structural representation of the utility model embodiment 3;

Fig. 5 is the shell mechanism schematic diagram of the utility model embodiment 2;

In figure: 1, shell, 2, vibrating detector, 3, upstream damping corrugated tube, 4, electric and magnetic oscillation driver, 5, delivery duct downstream road, 6, upstream conveyance conduit, 7, downstream flange, 8, vibrating tube, 9, ultrasonic probe, 10, downstream damping corrugated tube, 11, upstream flange.

Embodiment

Below in conjunction with accompanying drawing, the present embodiment is described in further detail, but the utility model is not limited to specific embodiment.

Embodiment 1:

A kind of compact gas-liquid stratified flow measurement mechanism, be connected with upstream conveyance conduit 6, upstream flange 11, upstream damping corrugated tube 3, vibrating tube 8, downstream damping corrugated tube 10, downstream flange 7 and delivery duct downstream road 5 in turn, the outside ring set of vibrating tube 8 has straight barrel type shell 1; The centre place of the upper surface of described vibrating tube 8 is provided with electric and magnetic oscillation driver 4, the centre place of lower surface is provided with 2 symmetrical vibrating detectors 2, and upstream vibrating detector 2 is equal to the distance of downstream flange 7 to the Distance geometry downstream vibrating detector 2 of upstream flange 11; The input end of described electric and magnetic oscillation driver 4 is connected with amplifier with signal generator, and output terminal is connected with vibrating tube 8.

The coupling of shell 1 shell inner surface is provided with the relative ultrasonic probe 9 of 1 group of horizontal axis position.

Embodiment 2:

A kind of compact gas-liquid stratified flow measurement mechanism, be connected with upstream conveyance conduit 6, upstream flange 11, upstream damping corrugated tube 3, vibrating tube 8, downstream damping corrugated tube 10, downstream flange 7 and delivery duct downstream road 5 in turn, the outside ring set of vibrating tube 8 has straight barrel type shell 1; The centre place of the upper surface of described vibrating tube 8 is provided with electric and magnetic oscillation driver 4, the centre place of lower surface is provided with 2 symmetrical vibrating detectors 2, and upstream vibrating detector 2 is equal to the distance of downstream flange 7 to the Distance geometry downstream vibrating detector 2 of upstream flange 11; The input end of described electric and magnetic oscillation driver 4 is connected with amplifier with signal generator, and output terminal is connected with vibrating tube 8.

The coupling of shell 1 shell inner surface is provided with the relative ultrasonic probe 9 of 1 group of horizontal axis position and the relative ultrasonic probe 9 of 1 group of vertical axis position.

Embodiment 3:

A kind of compact gas-liquid stratified flow measurement mechanism, be connected with upstream conveyance conduit 6, upstream flange 11, upstream damping corrugated tube 3, vibrating tube 8, downstream damping corrugated tube 10, downstream flange 7 and delivery duct downstream road 5 in turn, the outside ring set of vibrating tube 8 has straight barrel type shell 1; The centre place of the upper surface of described vibrating tube 8 is provided with electric and magnetic oscillation driver 4, the centre place of lower surface is provided with 2 symmetrical vibrating detectors 2, and upstream vibrating detector 2 is equal to the distance of downstream flange 7 to the Distance geometry downstream vibrating detector 2 of upstream flange 11; The input end of described electric and magnetic oscillation driver 4 is connected with amplifier with signal generator, and output terminal is connected with vibrating tube 8.

The coupling of vibrating tube 8 outside surface is provided with the relative ultrasonic probe 9 of 1 group of horizontal axis position.

The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.

Claims (4)

1. a compact gas-liquid stratified flow measurement mechanism, it is characterized in that: be connected with upstream conveyance conduit, upstream flange, upstream damping corrugated tube, vibrating tube, downstream damping corrugated tube, downstream flange and delivery duct downstream road in turn, the outside ring set of vibrating tube has straight barrel type shell; The centre place of the upper surface of described vibrating tube is provided with electric and magnetic oscillation driver, the centre place of lower surface is provided with 2 symmetrical vibrating detectors, and upstream vibrating detector is equal to the distance of downstream flange to the Distance geometry downstream vibrating detector of upstream flange; The input end of described electric and magnetic oscillation driver is connected with the output terminal of amplifier with signal generator, and output terminal is connected with the input end of vibrating tube.

2. a kind of compact gas-liquid stratified flow measurement mechanism according to claim 1, is characterized in that: described case body inside surface coupling is provided with the relative ultrasonic probe of 1-4 group horizontal axis position.

3. a kind of compact gas-liquid stratified flow measurement mechanism according to claim 1, is characterized in that: described vibrating tube outside surface coupling is provided with the relative ultrasonic probe of 1-4 group horizontal axis position.

4. a kind of compact gas-liquid stratified flow measurement mechanism according to claim 1, is characterized in that: described shell inner surface coupling is provided with the relative ultrasonic probe of 1-4 group horizontal axis position and the relative ultrasonic probe of 1-4 group vertical axis position.