Compact wet steam medium measuring method for power system

Abstract

The invention relates to the technical field of fluid dryness testing, and provides a power system compact type wet steam medium measuring method, which comprises a metering pipe body, a cylindrical streaming piece, a protective shell and a data processor, the cylindrical flow-around piece is arranged in the metering pipe body; the protective shell is arranged on the outer wall surface of the metering pipe body, and the differential pressure sensor and the piezoelectric sensor are arranged in the protective shell; the differential pressure sensor and the piezoelectric sensor are electrically connected with the data processor, and the data processor is used for obtaining the mass flow rate, sealing and dryness of the to-be-measured medium based on data of the differential pressure sensor and the piezoelectric sensor; a first pressure guiding hole and a second pressure guiding hole which are used for being communicated with the differential pressure sensor are formed in a cylinder body of the cylindrical streaming piece. The pressure guide holes are formed in the front edge and the side wings of the cylindrical flow-around piece and matched with data measured by the differential pressure sensor and the piezoelectric sensor, so that the mass flow rate, the density and the dryness of the to-be-measured medium are measured, and the complexity of the whole measuring device is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of fluid dryness testing, and more particularly to a compact method for measuring wet steam media in power systems. Background Technology

[0002] Due to the influence of dryness, the density of wet steam will change with the dryness. Conventional flow measurement devices (such as orifice plate flow meters, vortex flow meters, etc.) require additional testing of the dryness of wet steam to obtain the mass flow rate. The additional dryness measurement introduces more complex measurement requirements, which makes the measurement device in the power system more complex and increases the difficulty of measurement and the cost of setting it up. Summary of the Invention

[0003] This invention provides a compact wet steam medium measurement method for power systems, which solves the shortcomings of existing technologies in measuring the dryness of wet steam and limiting the measurement items.

[0004] This invention provides a compact wet steam medium measurement method for a power system, comprising: a metering tube, a cylindrical flow-around component, a protective shell, and a data processor; the cylindrical flow-around component is disposed within the metering tube and arranged radially along the metering tube; the protective shell is disposed on the outer wall of the metering tube and forms an installation space within the protective shell, wherein a differential pressure sensor and a piezoelectric sensor are disposed within the installation space; the differential pressure sensor and the piezoelectric sensor are electrically connected to the data processor, which is used to obtain the mass flow rate, density, and dryness of the medium to be measured based on the data from the differential pressure sensor and the piezoelectric sensor; wherein, a first pressure-inlet hole and a second pressure-inlet hole are formed on the cylindrical body of the cylindrical flow-around component, the first pressure-inlet hole facing the inflow direction of the medium to be measured within the metering tube, and the second pressure-inlet hole deviating from the inflow direction of the medium to be measured within the metering tube to form an angle with the first pressure-inlet hole; and both the first pressure-inlet hole and the second pressure-inlet hole are connected to two medium inlets on the differential pressure sensor via a pipeline system; the probe of the piezoelectric sensor is disposed on the pipeline between the first pressure-inlet hole and the differential pressure sensor; The measurement method includes the following steps: Obtain the vortex shedding frequency of the medium under test within the metering tube in the cylindrical flow path. ; Obtain the pressure of the medium to be measured within the metering tube at the leading edge of the cylindrical flow element. Pressure on the flanks and the pressure difference between the leading edge and the flanks ; Obtain the vortex shedding frequency of the medium under test Strauhar number and the diameter of the cylindrical flow element. The flow velocity of the medium under test can be obtained by the following formula. : In the formula, d is the diameter of the cylindrical flow element, and St is the Strouhal number; Based on the flow rate of the medium under test and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. And based on the density of the medium under test. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested .

[0005] According to the compact wet steam medium measurement method for power systems provided by the present invention, based on the flow rate of the medium to be measured... and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. Specifically, it includes the following steps: pressure difference The relationship is as follows: In the formula, This is the local pressure coefficient, and -1 ≤ ≤-2, The density is the density of the medium to be measured.

[0006] The compact wet steam medium measurement method for power systems provided by the present invention is based on the density of the medium being measured. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested Specifically, it includes the following steps: Obtain the cross-sectional area S of the metering tube and the mass flow rate of the medium to be measured. : In the formula, The density of the medium to be measured. The flow rate of the medium being measured is denoted as . Dryness of the medium being tested The relationship is as follows: In the formula, The density of water vapor, For dryness, This is the density of saturated water.

[0007] According to the compact wet steam medium measurement method for power systems provided by the present invention, on a cross section perpendicular to the axis of the cylindrical flow element, the central angle x between the line L1 connecting the center of the first pressure-inlet hole and the center of the circle and the line L2 connecting the center of the second pressure-inlet hole and the center of the circle is 90°.

[0008] According to the compact wet steam medium measurement method for power systems provided by the present invention, the cylindrical flow element is configured with a first flow channel and a second flow channel. The first flow channel is used to connect the first pressure tap and the differential pressure sensor, and the second flow channel is used to connect the second pressure tap and the differential pressure sensor. The probe of the piezoelectric sensor is disposed in the second flow channel.

[0009] According to the compact wet steam medium measurement method for power systems provided by the present invention, the data processor includes: an acquisition module, the acquisition module being used to acquire; The data processing module is used to obtain the flow rate of the medium under test based on the detection data of the piezoelectric sensor, and to obtain the mass flow rate, density and dryness of the medium under test based on the flow rate of the medium under test and the detection data of the piezoelectric sensor.

[0010] According to the compact wet steam medium measurement method for power systems provided by the present invention, the data processor also integrates a display.

[0011] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the measurement method as described above.

[0012] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the measurement method as described above.

[0013] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the measurement method as described in any of the preceding claims.

[0014] This invention provides a wet steam medium measurement system and method for a power system. By opening pressure-indicating holes at the leading edge and side flanks of a cylindrical flow-around component, and using a differential pressure sensor, the differential pressure between the leading edge and side flanks of the cylindrical flow-around component is measured. Combined with data measured by a piezoelectric sensor, the mass flow rate, density, and dryness of the medium under test can be measured. This reduces the complexity of the entire measurement device and enriches the measurement items. Furthermore, by placing the differential pressure sensor inside the cylindrical flow-around component, the overall structure can be made more compact. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is one of the internal structural schematic diagrams of the compact wet steam medium measurement method for power systems provided by the present invention.

[0017] Figure 2 This is the second schematic diagram of the internal structure of the compact wet steam medium measurement method for power systems provided by the present invention.

[0018] Figure 3 This is a flowchart illustrating the measurement method provided by the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0020] Figure label: 10. Metering tube body; 20. Cylindrical flow winding component; 21. First pressure tap; 22. Second pressure tap; 23. First flow channel; 24. Second flow channel; 30. Protective shell; 31. Installation space; 40. Differential pressure sensor; 50. Piezoelectric sensor; 51. Detection end; 60. Data processor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0024] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] In related technologies, the measurement of the mass flow rate of wet steam is affected by its dryness, resulting in poor accuracy of conventional measuring instruments (such as orifice plate flow meters, vortex flow meters, etc.). Furthermore, the measurement of dryness requires the introduction of more complex measuring devices and requirements, which makes the measuring devices in the power system more complex.

[0027] Regarding the problems in related technologies, such as Figure 1 , Figure 2As shown in the diagram, the arrows indicate the flow direction of the medium to be measured. This invention provides a compact wet steam medium measurement method for power systems, suitable for measuring the flow rate of wet steam with unknown density that can be approximated as a homogeneous medium. In this specification, the "medium to be measured" refers to wet steam. The device includes a metering tube 10, a cylindrical flow-around component 20, a protective shell 30, and a data processor 60. The cylindrical flow-around component 20 is disposed inside the metering tube 10 and arranged radially along the metering tube 10. The protective shell 30 is disposed on the outer wall of the metering tube 10 and forms an installation space 31 within the protective shell 30. A differential pressure sensor 40 and a piezoelectric sensor 50 are disposed within the installation space 31. The differential pressure sensor 40 and the piezoelectric sensor 50 are connected to the data processor 60. The data processor 60 is electrically connected to the differential pressure sensor 40 and the piezoelectric sensor 50 to obtain the mass flow rate, sealing and dryness of the medium to be measured. The cylindrical flow-around component 20 has a first pressure-inlet hole 21 and a second pressure-inlet hole 22 on its column. The first pressure-inlet hole 21 faces the flow direction of the medium to be measured in the metering tube 10, and the second pressure-inlet hole 22 is offset from the flow direction of the medium to be measured in the metering tube 10 to form an angle with the first pressure-inlet hole 21. The first pressure-inlet hole 21 and the second pressure-inlet hole 22 are both connected to the two medium inlets on the differential pressure sensor 40 through the pipeline system. The probe of the piezoelectric sensor 50 is located on the pipeline between the first pressure-inlet hole 21 and the differential pressure sensor 40. The measurement of the mass flow rate of wet steam is affected by its dryness, so it is necessary to measure the dryness. In this embodiment, pressure holes are opened at the leading edge and side wing of the cylindrical flow element 20, and the differential pressure sensor 40 is used to measure the differential pressure between the leading edge and side wing of the cylindrical flow element 20. Combined with the data measured by the piezoelectric sensor 50, the mass flow rate, density and dryness of the medium under test can be measured, which reduces the complexity of the entire measurement device.

[0028] Specifically, the data processor 60 includes an acquisition module and a data processing module. The acquisition module is used to acquire the detection data of the differential pressure sensor 40 and the piezoelectric sensor 50, and the data processing module is used to obtain the mass flow rate, density and dryness of the medium to be measured based on the detection data of the differential pressure sensor 40 and the piezoelectric sensor 50.

[0029] Specifically, the data processing module stores a computational model for processing data. This model can calculate the flow velocity of the medium under test based on the input vortex shedding frequency, and can also calculate the density, mass flow rate, and dryness fraction of the medium under test from its flow velocity. Specifically, the flow velocity of the medium under test can be calculated from the vortex shedding frequency, the Strouhal number, and the velocity of the cylindrical flow element 20. For details, please refer to the subsequent measurement method section.

[0030] The metering tube 10 has an overall pipe structure. Flanges are provided at both ends of the metering tube 10 along the axial direction. The flanges are used to connect with the pipe to be measured. The medium to be measured flows through the metering tube 10 along the axial direction. During the flow, pressure is introduced through the first pressure inlet 21 and the second pressure inlet 22. The static pressure difference between the leading edge and the side wing of the cylindrical flow element 20 is measured. Combined with the vortex shedding frequency measured by the piezoelectric sensor 50, the mass flow rate, density and dryness of the medium can be effectively measured.

[0031] It is understood that in this embodiment, by opening a first pressure-inducing hole 21 and a second pressure-inducing hole 22 at the leading edge and side wing of the cylindrical flow-around component 20, pressure is introduced to the differential pressure sensor 40 through the pressure-inducing holes. The differential pressure sensor 40 measures the pressure difference between the leading edge and the side wing to obtain a static differential pressure value. By combining this with the frequency measurement of the piezoelectric sensor 50, the mass flow rate, density, and dryness of the medium under test can be measured. This method simplifies the overall structure of the device and allows for accurate measurement values ​​to be obtained through calculation.

[0032] In the specific implementation scheme, the data processing model within the data processing module has a relationship function between vortex shedding frequency and medium flow velocity, as well as a relationship function between pressure difference medium density, medium flow velocity, and density and dryness fraction. This enables the calculation of the mass flow rate, density, and dryness fraction of the medium under test. Specific formulas can be found in the subsequent measurement methods section.

[0033] In some embodiments, such as Figure 2 As shown, on a cross-section perpendicular to the axis of the cylindrical flow element 20, the central angle x between the line L1 connecting the center of the first pressure-injecting hole 21 to the center of the circle and the line L2 connecting the center of the second pressure-injecting hole 22 to the center of the circle is 90°. The first pressure-injecting hole 21 faces the direction of the incoming flow of the medium, and the pressure measured at this position is the leading edge pressure of the cylindrical flow element 20. The central angle between the second pressure-injecting hole 22 and the first pressure-injecting hole 21 is 90°, which places the second pressure-injecting hole 22 on the side flank of the cylindrical flow element 20, enabling the measurement of the pressure at the side flank position. The limitation of the central angle of 90° makes the measured data more accurate.

[0034] Specifically, a first pressure-inducing hole 21 and a second pressure-inducing hole 22 are opened on the outer wall of the cylindrical flow-around component 20. The two pressure-inducing holes are connected to the two medium inlets of the differential pressure sensor 40 through pipes or flow channels, so that pressure can be continuously input to achieve accurate measurement of the pressure difference between the leading edge and the side wing of the cylindrical flow-around component 20.

[0035] In specific configuration, the cylindrical flow-around component 20 can be a hollow pipe structure. Inside the cylindrical flow-around component 20, there are two independent connecting pipes. The two connecting pipes can connect the first pressure-inlet hole 21, the second pressure-inlet hole 22 and the differential pressure sensor 40 to realize differential pressure measurement.

[0036] In conjunction with the above embodiments, the cylindrical flow element 20 is constructed with a first flow channel 23 and a second flow channel 24. The first flow channel 23 connects the first pressure-sensing hole 21 to the differential pressure sensor 40, and the second flow channel 24 connects the second pressure-sensing hole 22 to the differential pressure sensor 40. The probe of the piezoelectric sensor 50 is located within the second flow channel 24. Both pressure-sensing holes need to be connected to the differential pressure sensor 40 to achieve differential pressure measurement. In this embodiment, the connection between the pressure-sensing holes and the differential pressure sensor 40 is achieved through two flow channels. Furthermore, by placing the probe of the differential pressure sensor 40 within the second flow channel 24, the vortex shedding frequency can be measured through the probe. This method avoids the piezoelectric sensor 50 occupying space in other parts, making the overall structure more compact.

[0037] Specifically, the cylindrical flow element 20 is a solid cylindrical structure with two flow channels inside, which connect the pressure tap to the differential pressure sensor 40. The first flow channel 23 and the second flow channel 24 are independent channels that do not interfere with each other. For connection to the differential pressure sensor 40, a pipe can be connected to one end of the cylindrical flow element 20 located in the mounting space 31, thus connecting to the tail end.

[0038] Alternatively, one end of the cylindrical flow element 20 can extend into the mounting space 31, allowing the first flow channel 23 and the second flow channel 24 to be directly connected to the differential pressure sensor 40, thereby enabling differential pressure measurement of the leading edge and side wing. Furthermore, the probe of the piezoelectric sensor 50 extends into the second flow channel 24 and is electrically connected to the cylinder of the piezoelectric sensor 50 via a wire.

[0039] In some embodiments, the data processor 60 also integrates a display. Displaying measurement data via an integrated display facilitates data collection and recording by staff.

[0040] The present invention also provides a measurement method based on the above-mentioned compact wet steam medium measurement method for power systems, comprising the following steps: Step S10: Obtain the vortex shedding frequency of the medium to be measured downstream of the cylindrical flow element 20 within the metering tube 10. Specifically, the piezoelectric sensor 50 is electrically connected to the acquisition module in the data processor 60 via a data transmission line, thereby enabling information transmission and allowing the measured vortex shedding frequency to be displayed. The data is transmitted to the data processing module and processed by the data processing application.

[0041] Step S20: Obtain the pressure of the medium to be measured inside the metering tube 10 at the leading edge of the cylindrical flow element 20. Pressure on the flanks and the pressure difference between the leading edge and the flanks Specifically, the differential pressure sensor 40 measures the pressure difference between the leading edge and the side wing, and transmits it to the data processing module for processing.

[0042] Step S30: Based on vortex shelving frequency Obtain the flow rate of the medium to be measured Based on the flow rate of the medium under test and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. And based on the density of the medium under test. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested .

[0043] In conjunction with the above embodiments, after the measured fluid passes through the cylindrical flow-around component 20, a vortex street is formed downstream of the cylinder. This vortex street exhibits a certain periodicity and has a certain periodic frequency. Furthermore, the flow velocity of the medium being measured needs to be calculated first. To facilitate the measurement of other parameters (density, mass flow rate, and dryness fraction), the following steps are included: The flow velocity of the medium under test is obtained from the following vortex street equation. : In the formula, d is the diameter of the cylindrical flow element, and St is the Strouhal number. The vortex shear frequency; pressure difference : In the formula, This is the local pressure coefficient, and -1 ≤ ≤-2, is the density of the medium to be measured. Its specific value can be obtained through preliminary testing and calibration, while The flow rate of the medium under test is measured by differential pressure sensor 40. The density of the medium being tested can be measured by the above calculations.

[0044] It should be noted that for a flow process with a certain geometric structure and a certain flow velocity range, The frequency is essentially a constant and can be obtained through prior testing and calibration. During the vortex shedding process, a certain disturbance will occur in the local pressure within the second flow channel connected by the second pressure inlet, exhibiting a periodic variation pattern. The period of variation is consistent with the periodic frequency of the vortex shedding. Therefore, the vortex shedding frequency can be obtained by periodically measuring the fluid pressure within the second flow channel. And calculate the flow velocity of the medium. .

[0045] Furthermore, the fluid entering through the first pressure inlet 21 is the total incoming pressure, which is the pressure at the leading edge of the cylindrical flow element 20. It has the following relation: In the formula, For incoming flow pressure, The density of the medium to be measured is Given the flow velocity of the medium to be measured, the pressure at the leading edge of the cylindrical flow element 20 can be calculated using the above method. .

[0046] The fluid entering through the second pressure inlet 22 is the lateral pressure. for: In the formula, The density of the medium to be measured is The flow rate of the medium to be measured is... This is the local pressure coefficient, and -1 ≤ ≤-2, The specific value can be obtained through preliminary testing and calibration, and the lateral pressure of the cylindrical flow element 20 can be calculated based on the above. That is, the pressure difference is obtained through this measurement. The individual pressures at the leading edge and side flanks can then be calculated.

[0047] It should be noted that the oscillation of the vortex street downstream of the cylindrical turbulence element 20 will cause a small fluctuation in the measured pressure of the side wing pressure (i.e., the fluid pressure introduced by the second pressure inlet 22). The fluctuation amplitude is usually small and has little impact on the measurement accuracy. At the same time, the unsteady effect caused by vortex street shedding can be eliminated by calculating the average differential pressure over a period of time, and the average mass flow rate over a period of time can be measured.

[0048] The density of the medium under test obtained from the above measurements The mass flow rate was measured. Specifically, it includes the following steps: Obtain the cross-sectional area S of the metering tube 10 and the mass flow rate of the medium to be measured. : In the formula, The density of the medium to be measured. Let be the flow velocity of the medium being measured. It can be seen that in the above calculation formula, the density of the medium being measured... and the flow rate of the medium to be measured All of these calculations are performed using the methods described above, thus enabling quick and accurate calculation of mass flow rate. .

[0049] In conjunction with the above embodiments, the dryness of the test medium satisfies the following relationship, and is based on the density of the test medium. : In the formula, The density of water vapor, For dryness, This is the density of saturated water. The density of water vapor. and saturated water density Since it is a constant, the corresponding dryness fraction that needs to be calculated can be obtained. .

[0050] Furthermore, in practical applications, a boundary layer effect exists within the metering tube 10, resulting in a certain degree of non-uniformity in the flow velocity distribution across its cross-section, thus leading to… , While the coefficients are not entirely constant, the basic principles of the above relationships still hold true. Therefore, the database of previous tests and calibrations can be further enriched to test different flow rates and other conditions. and The coefficients are distributed equally, and advanced algorithms such as neural networks are applied in the data processor to further process them, thereby improving the test accuracy.

[0051] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions from the memory 430 to execute the aforementioned measurement method, which includes: acquiring the vortex shedding frequency of the medium under test downstream of the cylindrical flow element within the metering tube. ; Obtain the pressure of the medium to be measured within the metering tube at the leading edge of the cylindrical flow element. Pressure on the flanks and the pressure difference between the leading edge and the flanks Based on vortex shelving frequency Obtain the flow rate of the medium to be measured Based on the flow rate of the medium under test and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. And based on the density of the medium under test. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested .

[0052] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0053] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the measurement methods provided by the above methods, the method including: acquiring the vortex shedding frequency of the medium to be measured downstream of the cylindrical flow element in the metering tube. ; Obtain the pressure of the medium to be measured within the metering tube at the leading edge of the cylindrical flow element. Pressure on the flanks and the pressure difference between the leading edge and the flanks Based on vortex shelving frequency Obtain the flow rate of the medium to be measured Based on the flow rate of the medium under test and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. And based on the density of the medium under test. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested .

[0054] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the measurement methods provided by the methods described above, the method comprising: acquiring the vortex shedding frequency of the medium to be measured downstream of the cylindrical flow element within a metering tube. ; Obtain the pressure of the medium to be measured within the metering tube at the leading edge of the cylindrical flow element. Pressure on the flanks and the pressure difference between the leading edge and the flanks Based on vortex shelving frequency Obtain the flow rate of the medium to be measured Based on the flow rate of the medium under test and pressure difference The density of the medium to be measured is obtained according to the preset calculation strategy. And based on the density of the medium under test. The mass flow rate of the medium to be measured is obtained according to the preset calculation strategy. and the dryness of the medium being tested .

[0055] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0056] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compact wet-steam medium measurement method for power systems, characterized by, The measurement is based on a measuring device comprising: a metering pipe body; a cylindrical flow member arranged in the metering pipe body and along a radial direction of the metering pipe body; a protective shell arranged on an outer wall surface of the metering pipe body and forming an installation space in the protective shell, wherein a differential pressure sensor and a piezoelectric sensor are arranged in the installation space; a data processor, wherein the differential pressure sensor and the piezoelectric sensor are electrically connected to the data processor, and the data processor is configured to obtain a mass flow rate, a density and a dryness of the medium to be measured based on data of the differential pressure sensor and the piezoelectric sensor; wherein a first pressure introduction hole and a second pressure introduction hole are arranged on the cylindrical body of the cylindrical flow member, the first pressure introduction hole faces a flow direction of the medium to be measured in the metering pipe body, and the second pressure introduction hole deviates from the flow direction of the medium to be measured in the metering pipe body to form an included angle with the first pressure introduction hole; the first pressure introduction hole and the second pressure introduction hole are connected to two medium inlets of the differential pressure sensor through a pipeline system; a detection head of the piezoelectric sensor is arranged on a pipeline between the first pressure introduction hole and the differential pressure sensor; the measurement method comprises the following steps: Obtaining vortex shedding frequency of a medium to be measured in a metering tube body around a cylindrical flow member ; Obtaining the pressure of a medium to be measured in a metering tube before the leading edge of a cylindrical flow member the pressure of the flanks and the pressure difference between the leading edge and the flanks ; Obtaining a vortex shedding frequency of a medium under test , a Strouhal number , and a diameter of a cylinder flow member , and obtaining a flow rate of the medium under test by : wherein d is the diameter of the cylindrical flow member, and St is the Strouhal number; based on the flow rate of the medium to be measured and the pressure difference obtaining the density of the medium to be measured according to a preset calculation strategy , and based on the density of the medium to be measured obtaining the mass flow of the medium to be measured according to a preset calculation strategy and the dryness of the medium to be measured .

2. The power system compact wet steam medium measurement method of claim 1, wherein, based on the flow rate of the medium to be measured and the pressure difference obtaining the density of the medium to be measured according to a preset calculation strategy , and specifically comprising the following steps: differential pressure The relationship is as follows: wherein is the local pressure coefficient, and -1≤ ≤-2, is the medium density to be measured.

3. The power system compact wet steam medium measurement method of claim 1, wherein, based on the density of the medium to be measured obtaining the mass flow of the medium to be measured according to a predetermined calculation strategy and the dryness of the medium to be measured and comprising the following steps: acquiring a cross-sectional area S of the metering tube body, a mass flow rate of the medium to be measured : wherein is the density of the medium to be measured, is the flow rate of the medium to be measured; Dryness of the medium under test The relationship is as follows: wherein is the water vapor density, is the dryness, is the saturated water density.

4. The power system compact wet steam medium measurement method of claim 1, wherein, in a cross section perpendicular to the axis of the cylindrical flow member, a central angle x between a line L1 connecting the center of the first pressure introduction hole and the center of the circle and a line L2 connecting the center of the second pressure introduction hole and the center of the circle is 90°.

5. The power system compact wet steam medium measurement method of claim 1, wherein, a first flow channel and a second flow channel are arranged in the cylindrical flow member, the first flow channel is used to connect the first pressure introduction hole and the differential pressure sensor, and the second flow channel is used to connect the second pressure introduction hole and the differential pressure sensor; wherein the detection head of the piezoelectric sensor is arranged in the second flow channel.

6. The power system compact wet steam medium measurement method of claim 1, wherein, the data processor comprises: an acquisition module configured to acquire; a data processing module configured to obtain a flow rate of the medium to be measured based on detection data of the piezoelectric sensor, and obtain a mass flow rate, a density and a dryness of the medium to be measured based on the flow rate of the medium to be measured and the detection data of the piezoelectric sensor.

7. The power system compact wet steam medium measurement method of claim 6, wherein, the data processor is further integrated with a display.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, the processor executes the program to implement the measurement method according to any one of claims 5 to 7. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, the computer program is executed by the processor to implement the measurement method according to any one of claims 5 to 7.

10. A computer program product comprising a computer program, characterized in that, the computer program is executed by the processor to implement the measurement method according to any one of claims 5 to 7.

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