CN110763294A - Double-capacitance two-phase flow parameter measuring instrument and measuring method - Google Patents
Double-capacitance two-phase flow parameter measuring instrument and measuring method Download PDFInfo
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- CN110763294A CN110763294A CN201911037613.1A CN201911037613A CN110763294A CN 110763294 A CN110763294 A CN 110763294A CN 201911037613 A CN201911037613 A CN 201911037613A CN 110763294 A CN110763294 A CN 110763294A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
- G01F5/005—Measuring a proportion of the volume flow by measuring pressure or differential pressure, created by the use of flow constriction
Abstract
The invention discloses a double-capacitance two-phase flow parameter measuring instrument and a measuring method, wherein the double-capacitance two-phase flow parameter measuring instrument comprises a Venturi tube, a first capacitance module, a second capacitance module, a differential pressure module and a signal integration module; the differential pressure module is used for measuring a fluid pressure difference signal between the inlet section and the throat part of the Venturi tube; the first capacitance module is arranged on the periphery of the inlet section or the outlet section of the Venturi tube and used for measuring the first gas-liquid content of the fluid; the second capacitance module is arranged on the periphery of the inlet section or the outlet section of the Venturi tube and used for measuring a second gas-liquid content of the fluid; meanwhile, the second capacitance module sends the capacitance between the internal measurement electrodes to the signal integration module; and the signal integration module is used for coupling the first gas-liquid content and the second gas-liquid content to obtain the final gas-liquid content of the fluid, and generating a cross-sectional image of the fluid according to the change of the capacitance. The measuring instrument and the method have the advantages of simple structure, small volume, safety, reliability, capability of measuring various parameters, high precision and the like.
Description
Technical Field
The invention mainly relates to the technical field of gas-liquid two-phase flow measurement, in particular to a double-capacitance two-phase flow parameter measuring instrument and a measuring method.
Background
The gas-liquid two-phase flow measurement is mainly applied to the fields of energy, chemical industry and the like, is used for carrying out process control and capacity metering on oil and gas exploitation in the energy field, and is used for carrying out parameter monitoring and safety control on a fluidized bed and a heat exchanger of a chemical plant in the chemical industry field. The gas-liquid two-phase flow has complex flow characteristics, and the measurement technology has a plurality of difficulties which are mainly reflected in that: the number of characteristic parameters is large; the phase content rate has large change amplitude and high speed; the flow pattern and physical parameters (viscosity, density, etc.) are complex to change.
At present, the measurement of the gas-liquid two-phase flow in the fluid is mainly realized in a venturi + ray mode, wherein the venturi is used for measuring the total flow of the fluid, and the ray is used for measuring the content of the gas-liquid two-phase in the flow respectively corresponding to the gas-liquid two-phase flow.
The traditional venturi flow sensor measures the flow by measuring the pressure change and the temperature of a fluid flowing through a section of continuously-changing interface, but in some fields such as energy, chemical engineering and the like, the flow of the fluid needs to be measured, and the flow of gas-liquid phase components in the fluid needs to be measured.
The rays (x rays and r rays) have certain radiativity, so the requirements on safety and management and maintenance are extremely high, the requirements on use, maintenance and management of an instrument are strict, the measurement precision is poor, real-time imaging cannot be realized, and the flow pattern in a measurement pipeline cannot be displayed in real time. The defects of the ray method measurement also severely limit the application of the method in the fields.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the double-capacitor two-phase flow parameter measuring instrument and the measuring method which have the advantages of simple structure, small volume, safety, reliability, capability of measuring various parameters of the fluid and high precision.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a double-capacitance two-phase flow parameter measuring instrument comprises a Venturi tube, a first capacitance module, a second capacitance module, a differential pressure module and a signal integration module;
the differential pressure module is used for measuring a fluid differential pressure signal between the inlet section and the throat part of the Venturi tube and sending the fluid differential pressure signal to the signal integration module;
the first capacitance module is arranged on the periphery of the inlet section or the outlet section of the Venturi tube, is used for measuring the first gas-liquid content of the fluid and sending the first gas-liquid content to the signal integration module;
the second capacitance module is arranged on the periphery of the inlet section or the outlet section of the Venturi tube, is used for measuring a second gas-liquid content of the fluid and sends the second gas-liquid content to the signal integration module; meanwhile, the second capacitance module sends the capacitance between the internal measurement electrodes to the signal integration module;
the signal integration module is used for coupling the first gas-liquid content and the second gas-liquid content which are obtained by the measurement of the first capacitance module and the second capacitance module to obtain the final gas-liquid content of the fluid; for generating a cross-sectional image of the fluid from the change in capacitance of the second capacitive module.
As a further improvement of the above technical solution:
the venturi tube is provided with a temperature measuring hole and a temperature sensor, and the temperature sensor is installed in the temperature measuring hole and extends into the venturi tube.
The inlet section of the Venturi tube is provided with an inlet pressure-inducing hole communicated with the inside of the Venturi tube, the throat part of the Venturi tube is provided with a throat pressure-inducing hole communicated with the inside of the Venturi tube, and two ends of the differential pressure module are respectively connected with the inlet pressure-inducing hole and the throat pressure-inducing hole through pipelines.
The peripheral side of venturi entrance section or export section is provided with the mounting hole, first electric capacity module or second electric capacity module install in the mounting hole.
The week side of venturi is provided with two annular flanges that are parallel to each other, two be provided with the shell between the annular flange, shell, annular flange with form between the venturi and be used for the installation differential pressure module and signal integration module's cavity.
The inner side of the annular flange is provided with an annular step, and the shell is arranged in the annular step.
The signal integration module is arranged on the inner side of the shell, and the first capacitor module and the second capacitor module are connected with the signal integration module through wires; an output interface is arranged on the outer side of the shell, and the signal integration module is connected with the output interface.
The first capacitor module comprises two electrode plates which are symmetrically attached to the pipeline wall of the Venturi tube; the second capacitor module comprises two electrode plates which are symmetrically attached to the wall of the venturi tube.
The mounting direction of the two electrode plates of the first capacitor module is perpendicular to that of the two electrode plates of the second capacitor module, and the electrode plates of the first capacitor module and the second capacitor module cover the whole circumference of the Venturi tube together.
The invention also discloses a measuring method based on the double-capacitance two-phase flow parameter measuring instrument, which comprises the following steps:
the differential pressure module measures a fluid pressure difference signal between the inlet section and the throat part of the Venturi tube and sends the fluid pressure difference signal to the signal integration module, and the signal integration module obtains the flow of fluid according to the fluid pressure difference signal;
the first capacitance module measures a first gas-liquid content of the fluid, the second capacitance module measures a second gas-liquid content of the fluid, and the signal integration module couples the first gas-liquid content and the second gas-liquid content to obtain a final gas-liquid content of the fluid;
and the signal integration module generates a cross-sectional image of the fluid according to the capacitance change value between the measuring electrodes in the second capacitance module.
Compared with the prior art, the invention has the advantages that:
the invention relates to a double-capacitance two-phase flow parameter measuring instrument and a measuring method, which adopt the mode of combining the Venturi tube and a capacitance module to realize the acquisition of parameters and images such as fluid flow, gas-liquid content, section images and the like and realize the measurement of multiple parameters of fluid;
a pressure difference module in the Venturi tube acquires a fluid pressure difference signal between an inlet section and a throat part, the pressure difference is large, and the accuracy of the obtained flow signal is high;
the gas-liquid content of the inlet section and the outlet section of the Venturi tube is collected by adopting a first capacitance module and a second capacitance module, and the final gas-liquid content is obtained by performing coupling calculation on the two gas-liquid contents, so that the precision is high;
the mode that the structure of the Venturi tube is mutually assembled and matched with each capacitor module is adopted, so that the overall structure is simple, the assembly and disassembly are convenient, and the realization is easy;
compared with a Venturi tube and ray measurement mode, the scheme has the advantages of no radiation, high safety, convenience in maintenance and management, small size, capability of multi-parameter measurement, real-time imaging and the like.
Drawings
Fig. 1 is a schematic structural diagram of a measuring instrument according to an embodiment of the present invention.
FIG. 2 is a schematic structural view of an embodiment of the venturi of the present invention.
The reference numbers in the figures denote: 1. a temperature sensor; 2. a venturi tube; 21. an inlet pressure-leading hole; 22. a throat pressure guiding hole; 23. a temperature measuring hole; 24. a first mounting hole; 25. a second mounting hole; 26. a left step; 27. a right step; 3. a differential pressure module; 4. a first capacitive module; 5. a second capacitive module; 6. an inlet pressure-inducing pipeline; 7. a throat pressure-inducing pipe; 8. a lead 9 and a signal integration module; 10. an output interface; 11. a housing.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1 and fig. 2, the dual-capacitor two-phase flow parameter measuring instrument of the present embodiment includes a venturi tube 2, a first capacitor module 4, a second capacitor module 5, a differential pressure module 3, and a signal integration module 9; the differential pressure module 3 is used for measuring a fluid differential pressure signal between the inlet section and the throat part of the Venturi tube 2 and sending the fluid differential pressure signal to the signal integration module 9; the first capacitance module 4 is arranged on the periphery of the inlet section or the outlet section of the Venturi tube 2, is used for measuring the first gas-liquid content of the fluid and sends the first gas-liquid content to the signal integration module 9; the second capacitance module 5 is arranged on the periphery of the inlet section or the outlet section of the Venturi tube 2, is used for measuring a second gas-liquid content of the fluid and sends the second gas-liquid content to the signal integration module 9; meanwhile, the second capacitance module 5 sends the capacitance value between the internal measurement electrodes to the signal integration module 9; the signal integration module 9 is used for coupling the first gas-liquid content and the second gas-liquid content measured by the first capacitance module 4 and the second capacitance module 5 to obtain the final gas-liquid content of the fluid; and the capacitance value generating module is used for generating a cross-sectional image of the fluid according to the capacitance value change value of the second capacitance module 5, and specifically adopts a capacitance tomography technology.
The double-capacitor two-phase flow parameter measuring instrument adopts the mode of combining the Venturi tube 2 and the capacitor module to realize the acquisition of parameters and images such as fluid flow, gas-liquid content, section images and the like and realize the measurement of multiple parameters of fluid; the pressure difference module in the Venturi tube 2 acquires a fluid pressure difference signal between the inlet section and the throat part, the pressure difference is large, and the accuracy of the obtained flow signal is high; the gas-liquid content of the inlet section and the outlet section of the Venturi tube 2 is collected by adopting a first capacitance module 4 and a second capacitance module 5, and the final gas-liquid content is obtained by performing coupling calculation on the two gas-liquid contents, so that the precision is high; the mode that the structure of the Venturi tube 2 is mutually assembled and matched with each capacitor module is adopted, so that the overall structure is simple, the assembly and disassembly are convenient, and the realization is easy; compared with a measuring mode of Venturi tube 2 plus rays, the scheme has the advantages of no radiation, high safety, convenience in maintenance and management, small size, capability of multi-parameter measurement, real-time imaging and the like.
In this embodiment, the venturi tube 2 is provided with a temperature measuring hole 23 and a temperature sensor 1, and the temperature sensor 1 is installed in the temperature measuring hole 23 and extends into the venturi tube 2. Specifically, the temperature measuring hole 23 is located at the outlet section of the venturi tube 2, and the probe of the temperature sensor 1 is inserted into the temperature measuring hole 23 and extends into the fluid inside the venturi tube 2, so as to measure the temperature of the fluid.
In the embodiment, the inlet section of the venturi tube 2 is provided with an inlet pressure guide hole 21 communicated with the inside of the venturi tube 2, and an inlet pressure guide pipeline 6 is inserted into the inlet pressure guide hole 21; the throat of the venturi tube 2 is provided with a throat pressure guiding hole 22 communicated with the inside of the venturi tube 2, a throat pressure guiding pipeline 7 is inserted into the throat pressure guiding hole 22, and two ends of the differential pressure module 3 are respectively connected with the inlet pressure guiding pipeline 6 and the throat pressure guiding pipeline 7 to obtain the pressure difference between the two positions, so that the flow of the fluid is obtained.
In this embodiment, the inlet section of the venturi tube 2 is provided with a first mounting hole 24, and the first capacitor module 4 is mounted in the first mounting hole 24; the outlet section of the venturi tube 2 is provided with a second mounting hole 25, the second capacitor module 5 is mounted in the second mounting hole 25, the first capacitor module 4 and the second capacitor module 5 can be mounted in corresponding mounting holes in an adhesive manner and the like, the mounting manner is simple and convenient, the implementation is easy, and the overall structure is simple and compact. The first capacitance module 4 and the second capacitance module 5 adopt capacitance sensors and respectively comprise two electrode plates which are symmetrically attached to the pipeline wall of the Venturi tube 2; the mounting direction of the two electrode plates of the first capacitor module 4 is perpendicular to the mounting direction of the two electrode plates of the second capacitor module 5, and the electrode plates of the first capacitor module 4 and the second capacitor module 5 cover the whole circumference of the venturi tube 2 together. Because the dielectric constants of the two gas-liquid media are different, the dielectric constant between the two electrode plates can be measured through the first capacitor module 4, and the gas-liquid content of the two gas-liquid media can be calculated. Because two electrode plates of the first capacitor module 4 can not cover the whole area of the pipeline, the second capacitor module 5 is added, and the installation direction of the two electrode plates of the second capacitor module 5 is 90 degrees vertical to that of the two electrode plates of the first capacitor module 4, so that the whole area coverage and coupling measurement of the measured fluid are realized, and the measurement precision is improved. Of course, in other embodiments, the positions of the first capacitor module 4 and the second capacitor module 5 may be exchanged, and are not limited herein.
In this embodiment, two annular flanges parallel to each other are arranged on the peripheral side of the venturi tube 2, a housing 11 is arranged between the two annular flanges, and a cavity for mounting the differential pressure module 3 and the signal integration module 9 is formed among the housing 11, the annular flanges and the venturi tube 2; the inside of annular flange is provided with annular step, is left step 26 and right step 27 respectively, and shell 11 is installed in left step 26 and right step 27 to the protection of differential pressure module 3 in the cavity and signal integration module 9 is realized. The differential pressure module 3 is arranged in the cavity, the signal integration module 9 is arranged on the inner side of the shell 11, and the first capacitor module 4, the second capacitor module 5 and the temperature sensor 1 are connected with the signal integration module 9 through a lead 8; an output interface 10 (such as a serial port) is arranged on the outer side of the housing 11, the signal integration module 9 is connected with the output interface 10, and the signal integration module 9 outputs signals through the output interface 10.
The invention also discloses a measuring method based on the double-capacitance two-phase flow parameter measuring instrument, which comprises the following steps:
the differential pressure module 3 measures a fluid pressure difference signal between the inlet section and the throat part of the Venturi tube 2 and sends the fluid pressure difference signal to the signal integration module 9, and the signal integration module 9 obtains the flow rate of fluid according to the fluid pressure difference signal;
the first capacitance module 4 measures a first gas-liquid content of the fluid, the second capacitance module 5 measures a second gas-liquid content of the fluid, and the signal integration module 9 couples the first gas-liquid content and the second gas-liquid content to obtain a final gas-liquid content of the fluid;
the signal integration module 9 generates a cross-sectional image of the fluid according to the capacitance change value between the measurement electrodes inside the second capacitance module 5.
The measuring method of the invention is based on the measuring instrument to measure, not only has the advantages of the measuring instrument, but also is simple and easy to operate.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A double-capacitance two-phase flow parameter measuring instrument is characterized by comprising a Venturi tube (2), a first capacitance module (4), a second capacitance module (5), a differential pressure module (3) and a signal integration module (9);
the differential pressure module (3) is used for measuring a fluid pressure difference signal between the inlet section and the throat part of the Venturi tube (2) and sending the fluid pressure difference signal to the signal integration module (9);
the first capacitance module (4) is arranged on the periphery of the inlet section or the outlet section of the Venturi tube (2) and used for measuring the first gas-liquid content of the fluid and sending the first gas-liquid content to the signal integration module (9);
the second capacitance module (5) is arranged on the periphery of the inlet section or the outlet section of the Venturi tube (2) and used for measuring a second gas-liquid content of the fluid and sending the second gas-liquid content to the signal integration module (9); meanwhile, the second capacitance module (5) sends the capacitance between the internal measuring electrodes to the signal integration module (9);
the signal integration module (9) is used for coupling the first gas-liquid content and the second gas-liquid content which are obtained by the measurement of the first capacitance module (4) and the second capacitance module (5) to obtain the final gas-liquid content of the fluid; for generating a cross-sectional image of the fluid from the change in capacitance of the second capacitive module (5).
2. The double-capacitance two-phase flow parameter measuring instrument according to claim 1, wherein a temperature measuring hole (23) and a temperature sensor (1) are arranged on the venturi tube (2), and the temperature sensor (1) is installed in the temperature measuring hole (23) and extends into the venturi tube (2).
3. The dual-capacitance two-phase flow parameter measuring instrument according to claim 1 or 2, wherein an inlet pressure guide hole (21) communicated with the inside of the venturi tube (2) is formed in an inlet section of the venturi tube (2), a throat pressure guide hole (22) communicated with the inside of the venturi tube (2) is formed in a throat of the venturi tube (2), and two ends of the differential pressure module (3) are respectively connected with the inlet pressure guide hole (21) and the throat pressure guide hole (22) through pipes.
4. The dual-capacitance two-phase flow parameter measuring instrument according to claim 1 or 2, wherein a mounting hole is formed on the peripheral side of the inlet section or the outlet section of the venturi tube (2), and the first capacitance module (4) or the second capacitance module (5) is mounted in the mounting hole.
5. The dual-capacitance two-phase flow parameter measuring instrument according to claim 1 or 2, wherein two annular flanges parallel to each other are arranged on the peripheral side of the venturi tube (2), a housing (11) is arranged between the two annular flanges, and a cavity for mounting the differential pressure module (3) and the signal integration module (9) is formed between the housing (11), the annular flanges and the venturi tube (2).
6. The two-phase flow parameter measuring instrument with double capacitance according to claim 5, wherein the inner side of the annular rib is provided with an annular step, and the outer shell (11) is installed in the annular step.
7. The dual-capacitance two-phase flow parameter measuring instrument according to claim 5, wherein the signal integration module (9) is mounted inside the housing (11), and the first capacitance module (4) and the second capacitance module (5) are connected with the signal integration module (9) through wires (8); an output interface (11) is arranged on the outer side of the shell (11), and the signal integration module (9) is connected with the output interface (11).
8. The dual-capacitance two-phase flow parameter measuring instrument according to claim 1 or 2, wherein the first capacitance module (4) comprises two electrode plates symmetrically applied to the wall of the venturi tube (2); the second capacitor module (5) comprises two electrode plates which are symmetrically attached to the wall of the venturi tube (2).
9. The two-phase flow parameter measuring instrument with double capacitors according to claim 8, wherein the two electrode plates of the first capacitor module (4) are installed in a direction perpendicular to the two electrode plates of the second capacitor module (5), and the electrode plates of the first capacitor module (4) and the second capacitor module (5) together cover the entire circumference of the venturi tube (2).
10. A measuring method based on the dual-capacitance two-phase flow parameter measuring instrument of any one of claims 1 to 9, characterized by comprising the steps of:
the differential pressure module (3) measures a fluid pressure difference signal between the inlet section and the throat part of the Venturi tube (2) and sends the fluid pressure difference signal to the signal integration module (9), and the signal integration module (9) obtains the flow rate of fluid according to the fluid pressure difference signal;
the first capacitance module (4) measures a first gas-liquid content of the fluid, the second capacitance module (5) measures a second gas-liquid content of the fluid, and the signal integration module (9) couples the first gas-liquid content and the second gas-liquid content to obtain a final gas-liquid content of the fluid;
the signal integration module (9) generates a cross-sectional image of the fluid according to the capacitance change value between the measuring electrodes in the second capacitance module (5).
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