CN113848240A - Gas-liquid two-phase flow section imaging device - Google Patents
Gas-liquid two-phase flow section imaging device Download PDFInfo
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- CN113848240A CN113848240A CN202111142430.3A CN202111142430A CN113848240A CN 113848240 A CN113848240 A CN 113848240A CN 202111142430 A CN202111142430 A CN 202111142430A CN 113848240 A CN113848240 A CN 113848240A
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- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
Abstract
A vertical conductive wire mesh and a horizontal conductive wire mesh of the gas-liquid two-phase flow section imaging device form a group of measuring units for measuring gas-liquid phase distribution projection in the horizontal direction, and the vertical conductive wire mesh and the horizontal conductive wire mesh form another group of measuring units for measuring gas-liquid phase distribution projection in the vertical direction, and reconstructing the projections in the horizontal direction and the vertical direction, so that real-time imaging of gas-liquid phase distribution can be realized. The invention has the advantages that the capacitance values on all the capacitance wires contacted with the lead can be simultaneously measured, and the length of the liquid film contacted with the capacitance wires is accurately calculated through the capacitance values, thereby greatly improving the imaging speed and precision.
Description
The technical field is as follows:
the invention belongs to the technical field of multiphase flow measurement, and particularly relates to a gas-liquid two-phase flow section imaging device.
Background art:
the gas-liquid two-phase flow is widely used in the engineering fields of petroleum, chemical engineering, energy power and the like. Along with different gas-liquid phase flow velocities, the gas-liquid phase flow pipe section can present different distribution forms, namely, various flow patterns such as stratified flow, wave flow, slug flow, annular flow and the like can appear. Accurate measurement of gas-liquid phase distribution is a precondition for researching multiphase flow rules and monitoring the operating condition of a multiphase flow system.
At present, the methods for measuring gas-liquid phase distribution mainly include a radiation absorption method, a conductance probe method, a tomography method, and the like.
Radiation methods require the use of radioactive sources, are expensive to manufacture, and present radiation risks.
The invention discloses a monofilament capacitance probe measuring system for phase content and phase interface in multiphase pipe flow, which is an application number 200610042792.4, and provides an in-pipe monofilament capacitance probe for measuring the section phase fraction of a multiphase pipe.
Chinese patent No. 201610802066.1 discloses a novel capacitive gas-liquid two-phase separation flow liquid film distribution measuring device, which can realize accurate measurement of circumferential distribution of liquid films. However, the cyclone is needed to modify the inlet flow pattern, and the average liquid holdup is obtained, so that the gas-liquid phase distribution in a natural flow state cannot be measured.
The chromatographic imaging method can obtain the gas-liquid real-time distribution on the pipe section, wherein the X-ray and gamma-ray chromatographic imaging technology is most widely applied. The detection principle is based on the attenuation degree of the radioactive ray penetrating the two-phase or multi-phase fluid to be detected. But the disadvantages are poor real-time performance, high cost and poor safety.
Another new method of electroconductivity tomography is proposed in US 6314373. The conductance sensitive array consists of 2 layers of parallel electrodes which are vertical to each other, the electrodes are bare wires with the diameter equal to 0.12mm, the layer spacing is 1.5mm, and the distance between two adjacent parallel electrodes is equal to 3 mm. The device utilizes the cross nodes (space cross) formed by horizontal and vertical electrodes to form a local conductance 'probe', the conductance between the two electrodes mainly depends on the distribution of two-phase medium at the node, and the local phase distribution of each node area on the flow cross section can be directly obtained by sequentially measuring the conductance between each cross electrode without complex image reconstruction operation. The measurement accuracy of this imaging method depends on the spacing between two adjacent electrodes, which increases the interference with the flow field if the spacing between the wires is reduced, and increases the measurement error if the wire spacing is increased.
Patent 200410026282.9 discloses a mesh capacitive tomography method, in which a mesh capacitive sensor performs high-speed rotational scanning on a two-phase fluid in a pipe to obtain projection information of the two-phase fluid in each direction on the cross section of the pipe, and a real-time image of the two-phase flow is obtained through image reconstruction operation. However, the method has the disadvantages that the capacitance sensor needs to rotate to realize measurement, and a measurement system is complex and difficult to work continuously for a long time. In addition, the rotation of the electrode can interfere with the flow field, and bubbles and liquid drops can deviate from the original position under the action of the rotating mesh wire, thereby causing measurement errors.
In view of the problems in the prior art, the invention provides a novel gas-liquid two-phase flow interface imaging device, which can measure the projections of gas-liquid phase distribution in the horizontal direction and the vertical direction and realize real-time imaging of the gas-liquid two-phase distribution through linear reconstruction. The invention has the advantages that the capacitance values on all the capacitance wires in contact with the conducting wire can be measured simultaneously, and the length of the liquid film in contact with the capacitance wires is accurately calculated through the capacitance values, thereby greatly improving the imaging speed and precision.
The invention content is as follows:
a gas-liquid two-phase flow cross section imaging device is characterized in that: the intelligent monitoring system mainly comprises a vertical conductive screen, a horizontal capacitive screen, a vertical capacitive screen, a horizontal conductive screen, a wiring terminal, an acquisition control module and an imaging computer, wherein the vertical conductive screen, the horizontal capacitive screen, the horizontal conductive screen and the vertical capacitive screen are sequentially arranged along the axis direction of a pipeline, the screen surface is perpendicular to the axis direction of the pipeline, the distance between the screen surfaces is 0.5mm-1.5mm, the vertical capacitive screen and the horizontal conductive screen are all connected with the wiring terminal, the wiring terminal is connected with the acquisition control module, and the acquisition control module is connected with the acquisition computer.
The vertical conductive silk screen is formed by a plurality of metal wires which are distributed at equal intervals along the vertical direction, the horizontal conductive silk screen is formed by a plurality of metal wires which are distributed at equal intervals along the horizontal direction, the horizontal capacitor silk screen is formed by a plurality of capacitor wires which are distributed at equal intervals along the horizontal direction, and the vertical capacitor silk screen is formed by a plurality of capacitor wires which are distributed at equal intervals along the vertical direction; the vertical conductive silk screen, the horizontal capacitance silk screen, the vertical capacitance silk screen and the horizontal conductive silk screen have the same silk screen number, and the distances among the silk screens are the same for the same silk screen.
The metal wire is a metal wire with a naked surface layer, and the diameter of the metal wire is 0.1-0.2 mm; the capacitor wire is of a double-layer structure, the middle core wire is a metal wire, the surface layer is provided with an insulating layer, the diameter of the metal wire is 0.1-0.2mm, and the thickness of the insulating layer is 1-5% of the diameter of the metal wire.
The control acquisition module consists of a power supply, a time sequence control circuit and a capacitance acquisition circuit; the power supply is connected with the sequential control circuit and provides electric energy for the circuit system to work; the time sequence control circuit is connected with metal wires of the vertical conductive wire mesh and the horizontal conductive wire mesh through wiring terminals and is switched on and off through the time sequence control circuit; the capacitance acquisition circuit is connected with metal wires at the upper ends of the capacitance wires of the horizontal capacitance silk screen and the vertical capacitance silk screen, and the capacitance values measured on the capacitance wires are converted into voltages to be input into the acquisition computer.
The vertical conductive wire mesh and the horizontal conductive wire mesh form a group of measuring units for measuring gas-liquid phase distribution projection in the horizontal direction, and the vertical conductive wire mesh and the horizontal conductive wire mesh form another group of measuring units for measuring gas-liquid phase distribution projection in the vertical direction and reconstructing the projections of the two, so that real-time imaging can be carried out on gas-liquid phase distribution.
Compared with the prior art, the invention has the following beneficial effects:
(1) no moving part is provided, the response speed is high, and the real-time measurement of gas-liquid phase section distribution can be realized;
(2) the measurement resolution depends on the thickness of the insulating layer of the capacitance wire, and is far superior to the traditional grid sensor;
(3) the measurement result is not influenced by the change of parameters such as the salt content of the measurement medium, the temperature and the like, and the measurement device can stably work in a wide flow pattern range.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a vertical conductive mesh;
FIG. 3 is a schematic view of a horizontal conductive screen;
FIG. 4 is a schematic view of a horizontal capacitive screen;
FIG. 5 is a schematic view of a vertical capacitive screen;
FIG. 6 is a schematic diagram of an insulated wire structure;
FIG. 7 is a schematic cross-sectional view of an insulated wire;
FIG. 8 is a schematic diagram of a single filament capacitance measurement;
FIG. 9 is a schematic diagram of the control and mining module;
FIG. 10 is a schematic view showing a gas-liquid horizontal distribution measurement;
FIG. 11 is a schematic view showing a gas-liquid vertical distribution measurement;
1. a vertical conductive wire mesh; 2. a horizontal capacitive screen; 3. a vertical capacitive screen; 4. a horizontal conductive wire mesh; 5. a wiring terminal; 6. a control and mining module; 7. collecting a computer; 8. a pipeline; 9 a metal wire; 10. a capacitance wire; 11. a tube wall; 12. a conductive metal core; 13. an insulating film; 14. a power source; 15. a timing control circuit; 16. a capacitance acquisition circuit; 17. liquid mass.
The specific implementation mode is as follows:
fig. 1 is a schematic structural diagram of the present invention. Mainly include vertical conductive wire net 1, horizontal electric capacity silk net 2, vertical electric capacity silk net 3, horizontal conductive wire net 4, binding post 5, accuse adopts module 6 to and gather computer 7, vertical conductive wire net 1, horizontal electric capacity silk net 2, horizontal conductive wire net 4, vertical electric capacity silk net 3 arrange in proper order along 8 axis directions of pipeline, the wire side keeps perpendicular with 8 axis directions of pipeline, the interval is 0.5mm-1.5mm each other, vertical conductive wire net 1, horizontal electric capacity silk net 2, vertical electric capacity silk net 3, the net silk of horizontal conductive wire net 4 all links to each other with binding post 5, binding post 5 links to each other with accuse adopts module 6, accuse adopts module 6 and gathers computer 7 and link to each other.
The vertical conductive silk screen 1 is formed by arranging a plurality of metal wires at equal intervals in the vertical direction, the horizontal conductive silk screen 4 is formed by arranging a plurality of metal wires at equal intervals in the horizontal direction, the horizontal capacitor silk screen 2 is formed by arranging a plurality of capacitor wires 10 at equal intervals in the horizontal direction, and the vertical capacitor silk screen 3 is formed by arranging a plurality of capacitor wires 10 at equal intervals in the vertical direction; the vertical conductive wire mesh 1, the horizontal capacitive wire mesh 2, the vertical capacitive wire mesh 3 and the horizontal conductive wire mesh 4 have the same number of wires, and the distances between the wires are the same for the same wire mesh.
Fig. 2 is a schematic view of a vertical conductive mesh. The vertical conductive wire mesh 1 is formed by a plurality of metal wires 9 which are distributed at equal intervals along the vertical direction, and all the metal wires are positioned on the same plane. Fig. 3 is a schematic view of a horizontal conductive screen. The horizontal conductive wire mesh 4 is formed by a plurality of metal wires 9 which are distributed at equal intervals along the horizontal direction, and all the metal wires are positioned on the same plane. The metal wires of the vertical conductive wire mesh 1 and the horizontal conductive wire mesh 4 are bare metal wires 9, and the surfaces of the metal wires are not covered by an insulating layer.
As shown in fig. 4, which is a schematic view of a horizontal capacitive silk screen, the horizontal capacitive silk screen 2 is formed by arranging a plurality of capacitive wires 10 at equal intervals along a horizontal direction, and the capacitive wires 10 are located on the same plane. As shown in fig. 5, which is a schematic view of a vertical capacitive silk screen 3, the vertical capacitive silk screen 3 is formed by arranging a plurality of capacitive wires 10 at equal intervals along a vertical direction, and the capacitive wires 10 are located on the same plane.
As shown in fig. 6 and 7, the capacitor wire 10 has a double-layer structure, the center is a conductive metal core 12, the outer surface is uniformly coated with an insulating film 13, and the insulating film 13 is a non-conductive film, and the thickness of the insulating film is less than 1.0% of the diameter of the conductive metal core 12. When the capacitance probe is brought into contact with a conductive liquid, the conductive liquid and the conductive metal core 12 form a cylindrical capacitor, and the insulating film 13 serves as a dielectric of the capacitor. The capacitance of the cylindrical capacitor can be calculated by the following formula (1):
in the formula: l is the thickness of the liquid film contacted with the probe; d is the diameter of the conductive metal core 12; δ is the thickness of the insulating film 13; ε represents a dielectric constant of the insulating film 13.
As can be seen from the formula, since d, delta and epsilon are constants, the thickness of the liquid film and the capacitance value of the probe are in a linear relationship. In addition, since the thickness of the insulating film 13 is much smaller than the diameter d of the conductive core, i.e., δ < < d, and thus ln ((d +2 δ)/d) is small, 2 π ε/ln ((d +2 δ)/d) is large, indicating that the method has high sensitivity. In addition, since epsilon is the dielectric constant of the insulating film 13 and has a value which is only related to the material of the insulating film 13 and is not related to the properties of the fluid itself, the measured value depends only on the length of the liquid film in contact with the capacitance wire 10 and is not affected by the fluctuation of parameters such as the ion content of the fluid itself, the temperature, the pressure and the like.
Fig. 9 is a schematic diagram of the control and sampling module. The control and acquisition module 6 comprises a power supply 14, a time sequence control circuit 15, a capacitance acquisition circuit 16 and the like, wherein the power supply 14 supplies electric energy to the control and acquisition module 6 to drive related circuits to work. The timing control circuit 15 is used for controlling the metal wires 9 of the vertical conductive wire mesh 1 or the horizontal conductive wire mesh 4 to be sequentially connected into a circuit, so that a closed circuit is provided for measuring the capacitance value on the capacitance wire 10 crossed with the wires. The capacitance acquisition module 16 functions to measure the capacitance value on each insulated wire and output to the imaging computer 7. The imaging computer 7 can calculate the corresponding liquid phase length in the horizontal and vertical directions by the formula (1) in a reverse way, and further realize the gas-liquid phase distribution section imaging.
Fig. 10 is a schematic view of gas-liquid horizontal distribution measurement. The conducting wires arranged in the vertical direction of the vertical conducting wire mesh 1 and the capacitance wires 10 arranged in the horizontal direction of the horizontal capacitance wire mesh 2 are perpendicular to each other, and a mesh structure covering the section of the measuring pipeline 8 is formed. During measurement, the time sequence control circuit 15 of the control acquisition module 6 is used for sequentially connecting each vertical conductive wire mesh 1 to a measurement system, and capacitance values on all the capacitive wires 10 intersected with the current lead are obtained. If the wire is not in contact with the liquid phase, the measured capacitance value is close to 0. If the electric conductive wire contacts with a certain liquid mass 17, the capacitance value of the capacitance wire 10 passing through the liquid mass 17 changes, the capacitance value is proportional to the contact length of the liquid mass 17 and the capacitance wire 10, and if the capacitance wire 10 does not contact with the liquid mass 17, the capacitance value measured by the capacitance wire 10 is still close to 0. Therefore, through the combination of the vertical conductive wire mesh 1 and the horizontal capacitance wire mesh 2, the accurate distribution of gas and liquid in the horizontal direction of the interface of the pipeline 8 can be obtained.
From fig. 10, by combining the vertical conductive mesh 1 and the horizontal capacitive mesh 2, an accurate distribution of the liquid mass 17 in the horizontal direction can be obtained. However, for the vertical direction, the resolution depends on the distance between two insulating wires, the error is large, and the measurement is improved by combining the horizontal conductive wire mesh 4 and the vertical capacitive wire mesh 3.
Fig. 11 is a schematic view of gas-liquid vertical distribution measurement. The metal wires 9 arranged along the horizontal direction of the horizontal conductive wire mesh 4 and the capacitance wires 10 arranged along the vertical direction of the vertical capacitance wire mesh 3 are perpendicular to each other, and a mesh structure covering the section of the measurement pipeline 8 is formed. And sequentially connecting each lead on the horizontal conductive wire mesh 4 into the measuring system through a time sequence control circuit 15 of the control acquisition module 6 to obtain capacitance values on all the capacitive wires 10 intersected with the conductive wires. If the wire is not in contact with the liquid phase, the measured capacitance value is close to 0. If the conductive wire contacts with a certain liquid mass 17, the capacitance value of the capacitance wire 10 passing through the liquid mass 17 will change, and the capacitance value is proportional to the contact length between the liquid mass 17 and the capacitance wire 10, and if the capacitance wire 10 does not contact with the liquid mass 17, the capacitance value on the capacitance wire 10 still approaches 0.
The vertical conductive wire mesh 1, the horizontal capacitance wire mesh 2, the vertical capacitance wire mesh 3 and the horizontal conductive wire mesh 4 are sequentially arranged along the pipeline 8. The vertical conductive wire mesh 1 and the horizontal capacitance wire mesh 2 form a group of measuring units for measuring gas-liquid phase distribution projection in the horizontal direction. The vertical capacitance wire mesh 3 and the horizontal conductive wire mesh 4 form another group of measuring units for measuring gas-liquid phase distribution projection in the vertical direction. The gas-liquid two-phase distribution can be imaged in real time by reconstructing the projections in the horizontal direction and the vertical direction.
The invention can realize the simultaneous measurement of capacitance values on all the capacitance wires 10 contacted with the conducting wire, and accurately calculate the length of the liquid film contacted with the capacitance wires 10 through the capacitance values. Therefore, compared with the traditional grid imaging method for obtaining gas-liquid distribution of the cross section by measuring the conductance or capacitance of the cross point of the conducting wire, the cross section imaging speed and accuracy are greatly improved.
Claims (4)
1. A gas-liquid two-phase flow cross section imaging device is characterized in that: mainly include vertical conductive wire net (1), horizontal electric capacity silk net (2), vertical electric capacity silk net (3), horizontal conductive wire net (4), binding post (5), the control adopts module (6) to and gather computer (7), vertical conductive wire net (1), horizontal electric capacity silk net (2), horizontal conductive wire net (4), vertical electric capacity silk net (3) are arranged along pipeline (8) axis direction in proper order, the wire side keeps perpendicular with pipeline (8) axis direction, the interval 0.5mm-1.5mm each other, vertical electric capacity silk net (3), the wire net of horizontal conductive wire net (4) all links to each other with binding post (5), binding post (5) and control adopt module (6) to link to each other, control adopts module (6) and gathers computer (7) and link to each other.
2. A gas-liquid two-phase flow sectional imaging device according to claim 1, characterized in that: the vertical conductive silk screen (1) is formed by arranging a plurality of metal wires at equal intervals along the vertical direction, the horizontal conductive silk screen (4) is formed by arranging a plurality of metal wires at equal intervals along the horizontal direction, the horizontal capacitor silk screen (2) is formed by arranging a plurality of capacitor wires (10) at equal intervals along the horizontal direction, and the vertical capacitor silk screen (3) is formed by arranging a plurality of capacitor wires (10) at equal intervals along the vertical direction; the vertical conductive wire mesh (1), the horizontal capacitive wire mesh (2), the vertical capacitive wire mesh (3) and the horizontal conductive wire mesh (4) have the same number of wires, and the distances between the wires are the same for the same wire mesh; the metal wire is a metal wire (12) with a naked surface layer, and the diameter of the metal wire is 0.1-0.2 mm; the capacitor wire (10) is of a double-layer structure, the middle core wire is a metal wire (12), the surface layer is provided with an insulating layer (13), the diameter of the metal wire (12) is 0.1-0.2mm, and the thickness of the insulating layer is 1-5% of the diameter of the metal wire (12).
3. A gas-liquid two-phase flow sectional imaging device according to claim 1, characterized in that: the control acquisition module (6) consists of a power supply (14), a time sequence control circuit (15) and a capacitance acquisition circuit (16); the power supply (14) is connected with the sequential control circuit (15) and supplies electric energy for the work of the circuit system; the time sequence control circuit (15) is connected with metal leads (12) of the vertical conductive silk screen (1) and the horizontal conductive silk screen (4) through a wiring terminal (5), and the on and off of the circuit are controlled through the time sequence control circuit (15); the capacitance acquisition circuit (16) is connected with metal conducting wires (12) at the upper tail ends of capacitance wires (10) of the horizontal capacitance silk screen (2) and the vertical capacitance silk screen (3), and the capacitance values measured on the capacitance wires are converted into voltages to be input into an acquisition computer.
4. A gas-liquid two-phase flow sectional imaging device according to claim 1, characterized in that: the vertical conductive wire mesh (1) and the horizontal capacitive wire mesh (2) form a group of measuring units for measuring gas-liquid phase distribution projection in the horizontal direction, the vertical capacitive wire mesh (3) and the horizontal conductive wire mesh (4) form another group of measuring units for measuring gas-liquid phase distribution projection in the vertical direction, and the projections of the two are reconstructed, so that gas-liquid phase distribution can be imaged in real time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527177A (en) * | 2022-02-21 | 2022-05-24 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous vacuole share distribution imaging system |
| CN114689667A (en) * | 2022-03-28 | 2022-07-01 | 上海交通大学 | Method for measuring two-phase mixing rate in rod bundle channel based on silk screen sensor |
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2021
- 2021-09-28 CN CN202111142430.3A patent/CN113848240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527177A (en) * | 2022-02-21 | 2022-05-24 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous vacuole share distribution imaging system |
| CN114527177B (en) * | 2022-02-21 | 2022-10-21 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous void fraction distribution imaging system |
| CN114689667A (en) * | 2022-03-28 | 2022-07-01 | 上海交通大学 | Method for measuring two-phase mixing rate in rod bundle channel based on silk screen sensor |
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