CN213812438U - Differential pressure type wet gas flowmeter based on double resonance tubes - Google Patents
Differential pressure type wet gas flowmeter based on double resonance tubes Download PDFInfo
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- CN213812438U CN213812438U CN202023333240.3U CN202023333240U CN213812438U CN 213812438 U CN213812438 U CN 213812438U CN 202023333240 U CN202023333240 U CN 202023333240U CN 213812438 U CN213812438 U CN 213812438U
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Abstract
The application relates to a differential pressure type wet gas flowmeter based on double resonance tubes, which comprises an input tube, a throttling part and an output tube which are connected in sequence, wherein the throttling part comprises a contraction tube, a first resonance tube, a second resonance tube and an expansion tube, the first resonance tube and the second resonance tube are parallel to each other, the input tube is communicated with one end of the first resonance tube and one end of the second resonance tube through the contraction of the contraction tube, and the other end of the first resonance tube and the other end of the second resonance tube are communicated with the output tube through the expansion tube; pressure taking ports are formed in the input pipe and the output pipe and are connected to the multi-parameter sensor, and temperature sensors are arranged at any position of the input pipe, the throttling part and the output pipe; and a transducer group for driving the first resonant tube and the second resonant tube to vibrate and detecting the vibration frequency. The present application has the effect of facilitating the measurement of the amount of gas and liquid flow in the moisture.
Description
Technical Field
The application relates to the field of moisture flow meters, in particular to a differential pressure type moisture flow meter based on double resonance tubes.
Background
The moisture is a special gas-liquid two-phase flow form, widely exists in various industries such as oil and gas exploitation, oil refining chemical industry, energy power and the like, the chemical industry and the oil and gas industry frequently measure the flow of various complex fluids in the production process, the moisture can have different flow patterns under different apparent flow rates, the density and viscosity distribution are related to the flow patterns, and the physical parameters of the moisture depend on the content of the gas-liquid two phases.
The single-phase meter is a commonly used flow rate detector, but the single-phase meter can only detect one type of fluid, if the single-phase meter is used for detecting moisture, the flow rate of liquid contained in the moisture causes certain errors in the detection result, and the single-phase meter is inconvenient for respectively detecting the flow rate of the gas and the flow rate of the liquid in the moisture.
SUMMERY OF THE UTILITY MODEL
In order to measure the air flow and the liquid flow in the moisture, the application provides a differential pressure type moisture flow meter based on double resonance tubes.
The application provides a based on two resonant tubes differential pressure formula humid air flowmeter adopts following technical scheme:
a differential pressure type wet gas flowmeter based on double resonance tubes comprises an input tube, a throttling part and an output tube which are sequentially connected, wherein the throttling part comprises a contraction tube, a first resonance tube, a second resonance tube and an expansion tube, the first resonance tube and the second resonance tube are parallel to each other, the input tube is communicated with one end of the first resonance tube and one end of the second resonance tube through the contraction of the contraction tube, and the other end of the first resonance tube and the other end of the second resonance tube are communicated with the output tube through the expansion tube;
pressure taking ports are formed in the input pipe and the output pipe and are connected to the multi-parameter sensor, and temperature sensors are arranged at any position of the input pipe, the throttling part and the output pipe;
and a transducer group for driving the first resonant tube and the second resonant tube to vibrate and detecting the vibration frequency.
Through adopting above-mentioned technical scheme, let in the input tube with moisture, make the velocity of flow of moisture change through shrink tube and expansion pipe, then carry out the pressure difference flow measurement between input tube and the output tube to drive first resonating tube and the vibration of second resonating tube and detect its vibration frequency through the transducer group, then calculate the content that obtains gas flow and liquid flow in the moisture with detection data such as pressure difference value, temperature value, vibration frequency, have the effect of being convenient for measure the gas flow and the liquid flow in the moisture.
Optionally, the cross-sectional radius of the shrink tube gradually decreases along the direction of the medium flow.
Optionally, an inner wall of the input tube near one end of the contraction tube is provided with an expansion surface inclined from the inside to the outside of the tube along the medium flowing direction.
Through adopting above-mentioned technical scheme, the moisture flows into the input tube, makes the circulation passageway enlarge through the expansion face that sets up, and then the wet gas velocity of flow reduces and saves certain energy, then flow with higher speed after the shrinkage pipe undergauge and realize the throttle, and then have to a certain extent make the moisture let in first resonance tube and the intraductal effect of second resonance more evenly.
Optionally, the cross-sectional radius of the expanding tube gradually increases along the direction of the medium flow.
Optionally, a reducing surface inclined from the outside to the inside of the pipe along the medium flowing direction is arranged on the inner wall of one end of the output pipe, which is far away from the expanding pipe.
By adopting the technical scheme, the flow velocity of the moisture is increased after passing through the vibrating first resonance tube and the vibrating second resonance tube, the moisture has larger kinetic energy, the moisture flows through the expansion tube to enable the flow passage of the moisture to be slowly enlarged, and the flow velocity is slowly reduced, so that the vibration of the flowmeter caused by the moisture with overlarge flow velocity can be reduced to a certain extent to interfere the measurement.
Drawings
Fig. 1 is a schematic diagram illustrating an overall structure of a flowmeter according to an embodiment of the present application.
Description of reference numerals: 1. an input tube; 11. expanding the surface; 2. a throttle section; 21. a shrink tube; 22. a first resonator tube; 23. a second resonator tube; 24. an expansion tube; 3. an output pipe; 31. a facet is reduced; 4. a multi-parameter sensor; 5. a temperature sensor; 6. an electro-mechanical energy transducer; 7. a mechanical energy-to-electrical transducer; 8. and a pressure taking port.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses a differential pressure type moisture flowmeter based on double resonance tubes. Referring to fig. 1, a differential pressure type wet gas flowmeter based on double resonance tubes comprises an input tube 1, a throttling part 2 and an output tube 3 which are connected in sequence, a flow meter is needed to be used, the input tube 1 and the output tube 3 of the flowmeter are communicated with a pipeline to be detected, the input tube 1 and the pipeline to be detected and the output tube 3 can be connected with the pipeline to be detected by adopting the existing fixing mode, if reliable fixing is carried out by utilizing a flange plate and the like, wet gas in the pipeline to be detected sequentially flows through the input tube 1 and the throttling part 2 and flows out from the output tube 3.
The throttling part 2 comprises a contraction pipe 21, a first resonance pipe 22, a second resonance pipe 23 and an expansion pipe 24, the first resonance pipe 22 and the second resonance pipe 23 are parallel to each other, the input pipe 1 is contracted by the contraction pipe 21 to communicate one end of the first resonance pipe 22 with one end of the second resonance pipe 23, and the other end of the first resonance pipe 22 and the other end of the second resonance pipe 23 are communicated with the output pipe 3 by the expansion pipe 24.
The section radius of the contraction tube 21 is gradually reduced along the medium flowing direction, and the inner wall of one end of the input tube 1 close to the contraction tube 21 is provided with an expansion surface 11 which inclines from the inside to the outside along the medium flowing direction; the section radius of the expanding pipe 24 is gradually increased along the medium flowing direction, and the inner wall of the output pipe 3 far away from one end of the expanding pipe is provided with a reducing surface 31 which inclines from the outside to the inside along the medium flowing direction.
The gradual change of the section radiuses of the contraction pipe 21 and the expansion pipe, and the inclined contraction surface 31 and the inclined expansion surface 11 are adopted, so that the flow speed is not easy to change suddenly when moisture passes through the flowmeter.
After moisture flows into the input tube 1, the flow channel is expanded through the arranged expansion surface 11, then the flow speed of the moisture is reduced, certain energy is stored, the moisture flows through the contraction tube 21, the contraction of the contraction tube 21 accelerates the moisture to flow into the first resonance tube 22 and the second resonance tube 23, and then the moisture can be more uniformly introduced into the first resonance tube 22 and the second resonance tube 23 to a certain extent.
The flow rate of the moisture is increased after the moisture passes through the vibrating first resonance tube 22 and the vibrating second resonance tube 23, and the first resonance tube 22 and the vibrating second resonance tube 23 are in a vibrating state, so that the moisture has larger kinetic energy when flowing out of the first resonance tube 22 and the vibrating second resonance tube 23, the moisture flows through the expansion tube 24, the flow passage of the moisture is slowly enlarged, and the flow rate is slowly reduced, so that the vibration of the flow meter caused by the moisture with too high flow rate can be reduced to a certain extent, and the measurement is interfered.
In this embodiment, the thicknesses of the input tube 1 and the output tube 3 are greater than the thicknesses of the first resonant tube 22 and the second resonant tube 23, and the thicknesses of the first resonant tube 22 and the second resonant tube 23 are thin and have certain elasticity, so that the first resonant tube 22 and the second resonant tube 23 can be vibrated conveniently, and the influence of the vibration of the first resonant tube 22 and the second resonant tube 23 on the input tube 1 and the output tube 3 is reduced to a certain extent.
In the embodiment, the throttle ratio D/D is more than or equal to 0.4 and less than or equal to 0.7; the length of the input tube is L1, the length of the output tube is L2, the length of the first resonator tube or the second resonator tube is L, the diameter of the inlet of the input tube is D, the diameter of the first resonator tube or the second resonator tube is D, the length of the contraction tube is H1, and the length of the expansion tube is H2; the taper angle of the contraction pipe section is alpha, and the taper angle of the expansion pipe section is beta; alpha is more than or equal to 20 degrees and less than or equal to 22 degrees, beta is more than or equal to 7 degrees and less than or equal to 15 degrees.
The input pipe 1 and the output pipe 3 are both provided with a pressure taking port 8, the pressure taking ports 8 are both connected to the multi-parameter sensor 4, the multi-parameter sensor 4 is connected with the pressure taking ports 8 through preset pressure transmission pipes, the multi-parameter sensor 4 can detect the pressure difference between the input pipe 1 and the output pipe 3, can also detect the pressure value on the input pipe 1, and can also detect the pressure value on the output pipe 3 in other embodiments; a temperature sensor 5 is provided at any one of the input pipe 1, the throttle section 2, and the output pipe 3, and the temperature sensor 5 in this embodiment is used to detect the temperature of the input pipe 1.
The flowmeter further comprises a transducer group for driving the first resonance tube 22 and the second resonance tube 23 to vibrate and detecting the vibration frequency, the transducer group comprises an electromechanical energy transducer 6 and a mechanical energy-to-electric transducer 7, the electromechanical energy transducer 6 is arranged on the side of the first resonance tube 22 away from the second resonance tube 23, the electromechanical energy transducer 6 drives the first resonance tube 22 and the second resonance tube 23 to vibrate, the mechanical energy-to-electric transducer 7 is arranged on the side of the second resonance tube 23 away from the first resonance tube 22, and the mechanical energy-to-electric transducer 7 is used for receiving the vibration frequency of the first resonance tube 22 and the second resonance tube 23.
The electro-mechanical energy transducer 6 and the mechanical energy-to-electric transducer 7 may be electromagnetic coils, or piezoelectric bodies, etc., and electromagnetic coils are selected in the present embodiment.
When the first resonant tube 22 and the second resonant tube 23 are driven to start vibrating, the vibration frequencies of the first resonant tube 22 and the second resonant tube 23 are not consistent, and further the first resonant tube 22 and the second resonant tube 23 collide with each other to start vibrating, and finally the vibration frequencies of the first resonant tube 22 and the second resonant tube 23 are consistent, so that the first resonant tube 22 and the second resonant tube 23 are more easily started vibrating.
The data output end of the multi-parameter sensor 4 and the data output end of the temperature sensor 5 are both connected with a flow computer, the electro-mechanical energy transducer 6 and the mechanical energy-electric transducer 7 are also connected with the flow computer, and then detection data such as a pressure difference value, a temperature value, vibration frequency and the like are calculated through the flow computer to obtain the content of gas flow and liquid flow in moisture, so that the flow computer has the effect of being convenient for measuring the gas flow and the liquid flow in the moisture.
The implementation principle of the differential pressure type moisture flowmeter based on the double resonance tubes in the embodiment of the application is as follows:
the gas-liquid two-phase medium flows into the flowmeter and is throttled and accelerated, a differential pressure is generated between the input pipe 1 and the output pipe 3, the differential pressure value can be measured by the multi-parameter sensor 4, and the resonant frequency of the first resonant pipe 22 and the second resonant pipe 23 is related to the density of the medium in the pipe, so that the mixed density of the medium in the pipe can be obtained by measuring the resonant frequency of the resonant pipes.
According to public knowledge, the flow formula of the throttling differential pressure flowmeter for a single-phase medium is as follows:
Qmmass flow rate
D-upstream pipe internal diameter
C-efflux coefficient
ρ1Fluid density under operating conditions
Beta-diameter ratio D/D
d-throat inside diameter
Δ p-differential pressure
Epsilon-coefficient of expansion
According to the formula, after the actual size of the device is determined, the relevant parameters of the flow formula are determined, the expansion coefficient is related to the medium, the gas-liquid component in the medium is changed, the expansion coefficient is objectively changed, the expansion coefficient can be obtained through component calculation of the medium, and the components of each gas-liquid phase can be determined through density measurement.
The resonant frequency of the first resonator tube 22 is related to its structure, material and mass, and the mass of the first resonator tube 22 is the mass of the tube body + the mass of the medium in the tube.
The mass of the first resonator tube 22 itself is determined after production, the mass of the medium being the product of the density of the medium and the volume of the first resonator tube 22, and the volume of the first resonator tube 22 is fixed, so that the vibration frequency has a direct correlation with the density, and the density of the medium can be obtained by measuring the resonance frequency of the resonator tubes.
The signal of a temperature sensor 5 is used for compensating the change of the rigidity of the resonance tube caused by the temperature change, the measurement of the vibration period is obtained by measuring the vibration period and the temperature of the resonance tube, and the measurement of the medium density utilizes the linear relation between the density and the vibration period of the resonance tube and a standard calibration constant; when measuring density, the pipeline rigidity, geometry and mass of fluid flowing through determine the natural frequency of the pipeline device, so that the fluid density can be deduced from the measured pipeline frequency.
After simplification, two parameters in the flow formula are: both the mix density and the differential pressure can be obtained by sensors. Thus, the total flow can be measured; under the condition of determining the gas components, the gas density is related to the temperature and the pressure, and the gas density under the working condition can be calculated through the temperature sensor 5 and the multi-parameter sensor 4; when the density of the gas liquid is obtained, the liquid content can be calculated through the mixed density.
Eta ═ density (mixed density-air density)/(liquid density-air density)
The two-phase flow contains gas and is compressible medium, its physical property is related to temperature, pressure and component, the component is inherent property of measured gas, the temperature and pressure are measured values, and by combining these quantities with calibration formula, the real-time values including compressible coefficient and outflow coefficient can be obtained, and from all calculation conditions meeting throttle type differential pressure flowmeter, the total flow can be obtained by substituting the formula, and the flow of each phase can be obtained by calculating liquid-containing rate, so that the metering of gas-liquid two-phase flow can be completed.
Total flow of liquid ═ η ═ total flow
Total flow rate of air (1-eta)
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. The utility model provides a based on two resonant tubes differential pressure formula moisture flowmeter which characterized in that: the input pipe (1) is communicated with one end of the first resonance pipe (22) and one end of the second resonance pipe (23) in a diameter reducing mode through the contraction pipe (21), the other end of the first resonance pipe (22) is communicated with the other end of the second resonance pipe (23) through the expansion pipe (24), and the output pipe (3) is communicated with the other end of the first resonance pipe (22) and the other end of the second resonance pipe (23) through the expansion pipe (24);
pressure taking ports (8) are formed in the input pipe (1) and the output pipe (3), the pressure taking ports (8) are connected to the multi-parameter sensor (4), and a temperature sensor (5) is arranged at any position of the input pipe (1), the throttling part (2) and the output pipe (3);
and a transducer group for driving the first (22) and second (23) resonator tubes into vibration and detecting the frequency of the vibration.
2. The differential pressure type moisture flowmeter based on the double resonance tubes as claimed in claim 1, wherein: the section radius of the shrink tube (21) is gradually reduced along the direction of medium flow.
3. The differential pressure type moisture flowmeter based on the double resonance tubes as claimed in claim 2, wherein: an expansion surface (11) which inclines from the inside to the outside of the pipe along the medium flowing direction is arranged on the inner wall of one end of the input pipe (1) close to the contraction pipe (21).
4. The differential pressure type moisture flowmeter based on the double resonance tubes as claimed in claim 1, wherein: the cross-sectional radius of the expanding tube (24) is gradually increased along the direction of medium flow.
5. The differential pressure type moisture flowmeter based on the double resonance tubes as claimed in claim 4, wherein: the inner wall of one end of the output pipe (3) far away from the expanding pipe is provided with a reducing surface (31) which inclines from the outside to the inside of the pipe along the medium flowing direction.
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| CN202023333240.3U CN213812438U (en) | 2020-12-30 | 2020-12-30 | Differential pressure type wet gas flowmeter based on double resonance tubes |
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| CN202023333240.3U CN213812438U (en) | 2020-12-30 | 2020-12-30 | Differential pressure type wet gas flowmeter based on double resonance tubes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433597A (en) * | 2023-12-20 | 2024-01-23 | 成都洋湃科技有限公司 | Mixed-phase flowmeter and method for measuring each phase flow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433597A (en) * | 2023-12-20 | 2024-01-23 | 成都洋湃科技有限公司 | Mixed-phase flowmeter and method for measuring each phase flow |
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