CN215374093U - Gas-liquid two-phase flowmeter - Google Patents
Gas-liquid two-phase flowmeter Download PDFInfo
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- CN215374093U CN215374093U CN202121822451.5U CN202121822451U CN215374093U CN 215374093 U CN215374093 U CN 215374093U CN 202121822451 U CN202121822451 U CN 202121822451U CN 215374093 U CN215374093 U CN 215374093U
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Abstract
The utility model discloses a gas-liquid two-phase flowmeter, which comprises a flowmeter body and a flow computer, wherein a fluid channel is formed in the flowmeter body, a throttling piece is arranged at one end, close to an inlet, in the fluid channel along the axis direction of the fluid channel, a hydraulic rotating wheel is arranged at one end, close to an outlet, in the fluid channel, a rotating speed sensor is arranged on the hydraulic rotating wheel, a rotating speed sensor is arranged at a position, corresponding to the rotating speed sensor, on the inner side of the fluid channel, a differential pressure sensor is arranged at a position, corresponding to the throttling piece, at the top of the flowmeter body, and both the rotating speed sensor and the differential pressure sensor are electrically connected with the flow computer. The utility model can realize the online metering without gas-liquid separation through the acquired differential pressure and the rotating speed of the rotating wheel, and can ensure the accuracy of metering.
Description
Technical Field
The utility model belongs to the field of two-phase fluid metering, and particularly relates to a gas-liquid two-phase flow meter.
Background
Two-phase flow metering has been a recognized problem in the world, and although there are many commercially available two-phase flow meters (such as vortex shedding flow meters, precession vortex flow meters, and radioactive flow meters), these flow meters have some problems:
1. the flowmeter containing the radioactive source has radioactivity, so that certain potential safety hazard exists;
2. other types of flow meters have the problems of easy internal parts, instability and low precision.
Therefore, in order to meet the requirement of two-phase flow measurement, a two-phase flow meter needs to be designed, so that the safety is ensured, and meanwhile, the measurement precision is good. The prior art has also been associated with some researches for solving the above problems, but none of them can meet the actual needs.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a gas-liquid two-phase flowmeter, which can realize gas-liquid non-separation on-line metering through the acquired differential pressure and the rotating speed of a rotating wheel and can ensure the accuracy of metering.
The technical scheme adopted by the utility model is as follows: a gas-liquid two-phase flowmeter comprises a flowmeter body and a flow computer, wherein a fluid channel is formed inside the flowmeter body, a throttling piece is arranged at one end, close to an inlet, of the fluid channel in the axial direction of the fluid channel, a hydraulic rotating wheel is arranged at one end, close to an outlet, of the fluid channel in the fluid channel, a rotating speed sensor is arranged on the hydraulic rotating wheel, a rotating speed sensor is arranged at the position, corresponding to the rotating speed sensor, of the inner side of the fluid channel, a differential pressure sensor is arranged at the position, corresponding to the throttling piece, of the top of the flowmeter body, and the rotating speed sensor and the differential pressure sensor are both electrically connected with the flow computer.
The utility model has the beneficial effects that:
1. the differential pressure is obtained through a differential pressure sensor, the rotating speed of a rotating wheel is obtained through a rotating speed sensor, and the gas-liquid two-phase flow is obtained through calculation by combining the obtained differential pressure and the rotating speed of the rotating wheel with a two-phase flow measuring principle, so that the gas-liquid non-separation online metering is realized;
2. simple structure, small volume, convenient installation, no need of front and back piping, no radioactivity, safety and reliability.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1. a flowmeter body; 2. a throttle member; 3. a hydraulic runner; 4. a differential pressure sensor; 5. a rotational speed sensor; 6. a rotational speed sensor; 7. a flow computer; 11. a fluid channel; 12. an inlet; 13. and (7) an outlet.
Detailed Description
The utility model will be described in further detail with reference to the following drawings and specific embodiments.
As shown in fig. 1, the utility model discloses a gas-liquid two-phase flowmeter, which comprises a flowmeter body 1 and a flow computer 7, wherein a fluid channel 11 is formed in the flowmeter body 1, a throttling element 2 is arranged at one end, close to an inlet 12, of the fluid channel 11 along the axis direction of the fluid channel, a hydraulic runner 3 is arranged at one end, close to an outlet 13, of the fluid channel 11, a rotating speed sensor 6 is arranged on the hydraulic runner 3, a rotating speed sensor 5 is arranged at a position, corresponding to the rotating speed sensor 6, on the inner side of the fluid channel 11, a differential pressure sensor 4 is arranged at a position, corresponding to the throttling element 2, of the top of the flowmeter body 1, and both the rotating speed sensor 5 and the differential pressure sensor 4 are electrically connected with the flow computer 7.
The flowmeter respectively obtains the differential pressure and the rotating wheel rotating speed through the differential pressure sensor 4 and the rotating wheel rotating speed, and calculates gas-liquid two-phase flow through the obtained differential pressure and the rotating wheel rotating speed and by combining a two-phase flow measuring principle, thereby realizing the gas-liquid non-separation on-line measurement.
The gas-liquid two-phase flowmeter can be used for measuring gas-liquid two-phase flow, and comprises a measuring method of the gas-liquid two-phase flowmeter, which comprises the following steps:
step 10, two-phase fluid enters a fluid channel 11 from an inlet 12, the fluid passes through a throttling element 2, a differential pressure sensor 4 acquires differential pressure and outputs the acquired differential pressure to a flow computer 7, the two-phase fluid impacts a hydraulic runner 3 and drives the hydraulic runner 3 to rotate, and a rotating speed sensor 5 acquires the rotating speed of the runner through a rotating speed sensor 6 arranged on the hydraulic runner 3 and outputs the acquired rotating speed of the runner to the flow computer 7;
step 20, calculating by the flow computer according to the rotating speed of the rotating wheel obtained in the step 10 to obtain the working condition volume flow of the gas-liquid two-phase flow, wherein the calculation formula is as follows:
qv＝ν*A
＝κγfA
＝κγfπD1 2/4，
wherein q isvIs the volume flow of gas-liquid two-phase flow, v is the flow velocity of gas-liquid two-phase flow, A is the cross-sectional area of fluid channel, k is flow coefficient, gamma is the conversion ratio coefficient, f is the rotation speed of rotary wheel, D1Is the fluid channel inner diameter;
step 30, obtaining the following formula according to the differential pressure and the throttle member measuring principle obtained in the step 10:
wherein q isvThe volume flow rate is the working condition of gas-liquid two-phase flow, C is the outflow coefficient of the throttling element, beta is the aperture ratio, epsilon is the expansion coefficient, A0The opening area of the throttling element is defined, delta P is the obtained differential pressure, and rho is the gas-liquid two-phase flow mixing density;
and step 40, obtaining the following formula according to the formula in the steps 20 and 30 and the gas-liquid two-phase flow measurement principle:
wherein, k is flow coefficient, gamma is rotation ratio coefficient, f is rotation speed of the runner, D1Is the inner diameter of the fluid passage, qvThe volume flow rate of the gas-liquid two-phase flow is the working condition volume flow rate, C is the outflow coefficient of the throttling element, beta is the aperture ratio, epsilon is the expansion coefficient, d is the equivalent opening diameter of the throttling element, delta P is the obtained differential pressure, and rho is the gas-liquid two-phase flow mixing density;
step 50, obtaining the following formula according to the formula in the step 40:
calculating to obtain the gas-liquid two-phase flow mixing density according to the formula, wherein rho is the gas-liquid two-phase flow mixing density, delta P is the obtained differential pressure, C is the outflow coefficient of the throttling element, beta is the aperture ratio, epsilon is the expansion coefficient, D is the equivalent opening diameter of the throttling element, kappa is the flow coefficient, gamma is the conversion ratio coefficient, f is the rotating speed of the rotating wheel, D is the equivalent opening diameter of the throttling element, kappa is the flow coefficient, gamma is the conversion ratio coefficient, f is the rotating speed of the rotating wheel, and1is the fluid channel inner diameter;
step 60, calculating to obtain the mass flow of the mixed fluid, the mass flow of the gas phase and the mass flow of the liquid phase based on an Euler formula and a mass conservation law, wherein the calculation formula is as follows:
qm＝qmg+qml
qm＝qvρ
qν＝qνg+qνl
qm＝qνgρg+qνlρl
ρ＝qm/qν
＝(qνgρg+qνlρl)/(qνg+qνl)，
wherein q ismFor mixed fluid mass flow, qmgIs the gas phase mass flow rate, qmlIs the mass flow rate of the liquid phase, qvIs the working condition volume flow of the gas-liquid two-phase flow, rho is the gas-liquid two-phase flow mixing density, qνgVolume flow rate in gas phaseνlVolume flow in liquid phasegDensity in gas phase regime, plThe density is the liquid phase working condition density;
step 70, calculating according to the definition or density method of the gas content of the fluid under the working condition and the liquid content of the fluid under the working condition to obtain the gas content of the fluid under the working condition and the liquid content of the fluid under the working condition, wherein the calculation formulas are respectively as follows:
GMF＝(qmg/qm)*100％
GVF＝(qvg/qv)*100％，
GVF＝(ρl-ρ)/(ρl-ρg)*100％
wherein GMF is the gas content of the fluid under the working condition, GVF is the liquid content of the fluid under the working condition, qmgIs the gas phase mass flow rate, qmFor mixed fluid mass flow, qνgVolume flow rate in gas phasevIs the working condition volume flow of gas-liquid two-phase flow, rholThe density is the liquid phase working condition density, rho is the gas-liquid two-phase flow mixed density, rhogThe density is the gas phase working condition density;
and 80, calculating to obtain gas-liquid two-phase flow.
In the metering method, the whole metering method is carried out in the following way: respectively acquiring differential pressure delta P and rotating wheel rotating speed f-calculating through the acquired rotating wheel rotating speed fObtaining the working condition volume flow q of the gas-liquid two-phase flowvAnd the working condition volume flow q of the gas-liquid two-phase flow is calculatedvObtaining the working condition volume flow q of the gas-liquid two-phase flow through the obtained differential pressure delta PvCalculation formula of (a) -gas-liquid two-phase flow working condition volume flow q obtained through differential pressure delta P and rotating wheel rotating speed fvFinding out the mathematical relation between the mixing density rho and the rotating speed f of the rotating wheel, calculating to obtain the gas-liquid two-phase flow mixing density rho, and calculating to obtain the mass flow q of the mixed fluidmGas phase mass flow rate qmgAnd mass flow q of the liquid phasemlCalculating to obtain the gas content GMF of the fluid under the working condition and the liquid content GVF of the fluid under the working condition, and calculating to obtain the gas-liquid two-phase flow.
The working condition volume flow q of the gas-liquid two-phase flow is calculated through the rotating speed f of the rotating wheelvThe method comprises the following steps of calculating the working condition volume flow q of the gas-liquid two-phase flowvThe method is a calculation method corresponding to the rotating speed sensor 5 and the rotating speed sensor 6 in the gas-liquid two-phase flowmeter, and finally the working condition volume flow q of the gas-liquid two-phase flow is obtained through calculationv. The working condition volume flow q of the gas-liquid two-phase flow is calculated through the differential pressure delta PvThe method is another method for calculating the working condition volume flow q of the gas-liquid two-phase flowvThe method is a calculation method corresponding to the differential pressure sensor 4 in the gas-liquid two-phase flowmeter, the calculation formula obtained in the method is used as the derivation of the subsequent formula, and the working condition volume flow q of the gas-liquid two-phase flow cannot be calculatedv。
The aperture ratio is obtained through the equivalent opening diameter of the throttling element and the inner diameter of the pipeline under the working condition, and the calculation formula is as follows:
β＝d/D，
wherein beta is aperture ratio, D is equivalent opening diameter of the throttling element, and D is inner diameter of the pipeline under working conditions.
In step 80, the calculation to obtain the gas-liquid two-phase flow includes calculating the gas-liquid two-phase flow by the volume flow and calculating the gas-liquid two-phase flow by the mass flow.
The metering method is characterized in that gas-liquid two-phase flow is calculated in a volume flow mode and a mass flow mode, and the two modes can be selected according to different fluids to be metered so as to meet different requirements.
The gas-liquid two-phase flow is obtained by volume flow calculation, and the calculation formula is as follows:
GVF＝(ρl-ρ)/(ρl-ρg)*100％
qvg＝qv*GVF
qvl＝qv*(1-GVF)
qvgb＝qvg*ρg/ρgb，
wherein GVF is the liquid content of the fluid under the working condition, rholThe density is the liquid phase working condition density, rho is the gas-liquid two-phase flow mixing density, qvgVolume flow rate in gas phasevIs the working condition volume flow q of gas-liquid two-phase flowvlVolume flow rate in liquid phasevgbIs the gas phase standard volume flow, rhogbIs the gas phase standard density.
The method for obtaining the gas-liquid two-phase flow by volume flow calculation can be suitable for measuring the production energy of well heads such as natural gas, shale gas and the like and similar measurement.
The gas-liquid two-phase flow is obtained by mass flow calculation, and the calculation formula is as follows:
qm＝qvρ
qmg＝qvρ*GMF
qml＝qvρ*(1-GMF)，
wherein GMF is the gas content of the fluid under the working condition, rholThe density is the liquid phase working condition density, rho is the gas-liquid two-phase flow mixed density, rhogDensity in gas phase regime, qmFor mixed fluid mass flow, qvIs the working condition volume flow q of gas-liquid two-phase flowmgIs the gas phase mass flow rate, qmlIs the liquid phase mass flow rate.
The above-described manner of obtaining the gas-liquid two-phase flow by the mass flow calculation is applicable to the measurement of steam and the measurement of a fluid similar to steam.
When the gas-liquid two-phase flowmeter is used for metering, two-phase fluid enters the fluid channel 11 through the inlet 12. The two-phase fluid first passes through the orifice 2, forms a differential pressure under the action of the orifice 2, and the differential pressure sensor 4 acquires the differential pressure and outputs the acquired differential pressure to the flow computer 7. Subsequently, the two-phase fluid impacts the hydraulic runner 3 and drives it to rotate, and the rotation speed sensor 5 acquires the runner rotation speed through the rotation speed sensor 4 provided on the hydraulic runner 3 and outputs the acquired runner rotation speed to the flow computer 7. The flow computer 7 can calculate the gas-liquid two-phase flow by the obtained differential pressure, the rotating speed of the rotating wheel and the two-phase flow measuring principle, thereby realizing the gas-liquid non-separation on-line measurement.
Rho of the utility modelgThe density of gas phase working condition is related to the components, working pressure, temperature and compression factor, and the rho valuelThe density of the liquid phase working condition is related to the physical property and the temperature of the liquid phase. q. q.svgbThe gas phase standard volume flow refers to the density of the working medium at 101.325KPa and 20 ℃. RhogbThe gas phase standard density refers to the density of the working medium at 101.325KPa and 20 ℃.
Before the metering of the gas-liquid two-phase flowmeter, the preset parameters comprise: A. k, D, D, rhog、ρlEpsilon, C, kappa and gamma, the parameters obtained by the device are f and delta P, and the parameters obtained by calculation are rho, GVF, GMF and qm、qmgAnd q isml。
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (1)
1. The gas-liquid two-phase flowmeter is characterized by comprising a flowmeter body and a flow computer, wherein a fluid channel is formed inside the flowmeter body, a throttling piece is arranged at one end, close to an inlet, of the fluid channel in the axial direction of the fluid channel, a hydraulic rotating wheel is arranged at one end, close to an outlet, of the fluid channel in the fluid channel, a rotating speed sensor is arranged on the hydraulic rotating wheel, a rotating speed sensor is arranged at the position, corresponding to the rotating speed sensor, of the inner side of the fluid channel, a differential pressure sensor is arranged at the position, corresponding to the throttling piece, of the top of the flowmeter body, and the rotating speed sensor and the differential pressure sensor are both electrically connected with the flow computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465690A (en) * | 2021-08-05 | 2021-10-01 | 四川奥达测控装置有限公司 | Gas-liquid two-phase flowmeter and metering method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113465690A (en) * | 2021-08-05 | 2021-10-01 | 四川奥达测控装置有限公司 | Gas-liquid two-phase flowmeter and metering method thereof |
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