CN117073772A - Method for measuring moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex - Google Patents
Method for measuring moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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Abstract
The application discloses a method for measuring the flow rate of a wet gas phase by utilizing MEMS triaxial acceleration frequency information of precession vortex, which comprises the following steps: the precession vortex flowmeter based on the MEMS triaxial acceleration sensor is used for measuring gas phase flow of a pipeline, collecting experimental pipeline pressure and temperature, outputting triaxial electrical signals, and eliminating gravity bias voltage from auxiliary measuring shaft output signals; performing differential processing on an output signal of a vortex sensitive shaft or a fluid main impact shaft and an output signal of an auxiliary measuring shaft after eliminating gravity bias voltage; performing fast Fourier transform on the output signals after differential processing to extract the main frequency of the differential signals of the precession vortex; obtaining a single-phase instrument coefficient K by utilizing the relation between vortex precession frequency and gas phase flow; repeating the steps to measure the moisture and extract the main frequency of the moisture differential signal; and introducing a moisture correction factor of the meter coefficient of the precession vortex flowmeter, and establishing a moisture metering model of the precession vortex flowmeter by utilizing the single-phase meter coefficient, the moisture correction factor and the main frequency of the differential signal based on a dimension analysis method to realize the measurement of the moisture gas phase flow.
Description
Technical Field
The application belongs to the technical field of flow measurement, and relates to a method for measuring moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex.
Background
The wet gas two-phase flow is widely used in the fields of petroleum, natural gas, power generation, aerospace and the like, and generally refers to a gas-liquid two-phase flow with a volume gas content of more than 95% or a Lockhart-Martinelli parameter of not more than 0.3. Of the three types of moisture defined by the American Petroleum Institute (API), category I moisture refers to ultra low liquid fraction moisture having a Lockhart-Martinelli parameter of no more than 0.02, or a liquid phase volume fraction (LVF) of less than 0.5%. In China, class I moisture is typically present in the produced gas at the wellhead of a low permeability gas field, and is typically directly metered using a single phase gas meter such as a precession vortex flowmeter and is not corrected. The precession vortex flowmeter is used as a speed flowmeter, adopts an advanced micro-processing technology, has the advantages of strong function, wide flow range, simple operation and maintenance, convenient installation and use and the like, and is widely applied to industries such as petroleum, chemical industry, electric power, metallurgy, urban gas supply and the like.
The precession vortex flowmeter realizes flow measurement according to the principle of vortex precession of forced vibration, and in single-phase gas measurement, vortex precession frequency and gas flow are in good linear correlation. However, when the precession vortex flowmeter is applied to wet gas flow measurement, the precession frequency is generally reduced along with the increase of the volume content of the liquid phase under the influence of the liquid phase entrainment in the gas phase, so that the predicted gas phase flow is generally lower; the liquid phase will also affect the precession characteristics of the precession vortex, destroying the stability of the precession nuclei and thus affecting the reliability of the flow measurement. For this reason, scholars at home and abroad have made many attempts at moisture precession vortex flow measurement. As in document [1 ]]In studying the measurement characteristics of a precession vortex flowmeter in low pressure moisture, hua et al found a "false low" of precession vortex, i.e., when entrained droplets were present in the gas phase, the gas flow readings were prone to negative bias, and when the Lockhart-Martinelli parameter X LM When the number is greater than a certain level (X LM >0.12 The swirl precession disappears. Subsequently, document [2]Hua and Geng utilize the low-false characteristic of the vortex precession frequency of the wet gas to connect a precession vortex flowmeter and a slotted orifice flowmeter in series to carry out wet gas with the volume content of liquid phase less than 0.8 percentStudies have been made and a moisture flow meter model has been proposed. Document [3]Xu Ying et al found that when the volumetric liquid content was greater than 0.50% by connecting differential pressure transmitters in parallel across the precession vortex flowmeter, the precession signal of the vortex was destroyed and the measurement was distorted. By adding the dimensionless moisture correction term in the form of a power exponent, a dual model of frequency and pressure drop parameters is established, so that the moisture measurement capability of the precession vortex flowmeter is further improved. Patent CN 216081610U is to measure the mixed flow of water vapor and natural gas, a pressure sensor is additionally arranged in the fluid flow cavity of the precession vortex flowmeter along the flow direction of the fluid, a throttling element is arranged between the two pressure sensors to generate differential pressure between the upstream and downstream of the throttling element, the differential pressure is obtained after the pressure treatment of the upstream and downstream of the throttling element is detected by the two pressure sensors, the volume flow of the fluid is detected by a precession frequency detecting element, the flow integrating instrument can calculate the respective flow of each component in the mixed multiphase flow according to the parameters such as pressure, temperature, differential pressure, volume flow and the like acquired by the sensors, and the precession frequency detecting element is a piezoelectric crystal, has complex structure, needs more sensors and has higher cost.
The piezoelectric sensor is commonly used in the existing precession vortex flowmeter, and the piezoelectric sensor has the problem that vortex precession signals and interference noise signals are difficult to distinguish at the same time, so that great difficulty is increased for subsequent signal processing and precession frequency extraction. With the rapid development of micro-electromechanical system (MEMS) technology, the wide application of MEMS triaxial acceleration sensing technology provides new possibilities for vortex precession signal detection. According to the difference of the vortex precession signals and the acting force directions of fluid pulsation noise, pipeline mechanical vibration and other various interference noise signals, the interference noise can be effectively eliminated based on the double differential technology of triaxial measurement of the triaxial acceleration sensor. Besides, the MEMS triaxial acceleration sensor is used for replacing a traditional piezoelectric sensor, so that vortex precession signal measurement in a three-dimensional space of a pipeline can be realized, and more valuable fluid information can be obtained.
[1]Chenquan Hua,Yanfeng Geng.Investigation on the swirlmeter performance in low pressure wet gas flow[J].Measurement,2011,44(5).
[2]Chenquan Hua,Yanfeng Geng.Wet gas metering technique based on slotted orifice and swirlmeter in series[J].Flow Measurement and Instrumentation,2013,30:138-143.
[3] Xu Ying, wang Senling, zhang Tao, liu, bay Li. Ultra-low liquid content moisture Dual parameter measurement method based on dual model [ J ]. University of Tianjin university journal, 2022,55 (07): 665-671.
Disclosure of Invention
The application aims to fill the gap in the prior art and provides a method for measuring the moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex.
The application aims at realizing the following technical scheme:
a method for measuring moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex is based on a precession vortex flowmeter provided with a triaxial acceleration sensor, and a temperature-pressure integrated sensor is arranged at the throat of the flowmeter; when the pipeline flow is measured by the precession vortex flowmeter, the three-axis acceleration sensor is defined as a fluid main impact axis which is consistent with the fluid direction; a definition consistent with the direction of insertion of the pipe is an auxiliary measuring axis; a plane perpendicular to the direction of fluid and the direction of insertion defined as the axis of sensitivity of precession to a vortex, comprising the steps of:
(1) Acquiring pressure and temperature of an experimental pipeline through a temperature-pressure integrated sensor, measuring single-phase gas flow in the pipeline through a precession vortex flowmeter, acquiring triaxial electrical signal output, and eliminating gravity bias voltage in an auxiliary measuring shaft output signal;
(2) Differential motion is carried out on the output signal of the vortex sensitive shaft or the fluid main impact shaft and the output signal of the auxiliary measuring shaft after the gravity bias voltage is eliminated;
(3) Performing fast Fourier transform on the output signals after differential processing to extract the main frequency of the differential signals of the precession vortex;
(4) Obtaining a single-phase instrument coefficient by utilizing the relation between the main frequency of the differential signal and the single-phase gas flow;
(5) Repeating the steps (1) - (3) to perform moisture measurement and extracting the main frequency of the moisture differential signal; and introducing a moisture correction factor of the meter coefficient of the precession vortex flowmeter, and establishing a moisture metering model of the precession vortex flowmeter by utilizing the single-phase meter coefficient, the moisture correction factor and the main frequency of the differential signal based on a dimension analysis method to realize the measurement of the moisture gas phase flow.
Further, introducing a moisture correction factor of the meter coefficient of the precession vortex flowmeter in the step (5), and establishing a moisture metering model of the precession vortex flowmeter by utilizing the single-phase meter coefficient, the moisture correction factor and a main frequency of a differential signal based on a dimension analysis method to realize measurement of moisture gas phase flow, wherein the specific formula is as follows:
UR～f(ξ,ζ)
wherein UR is a moisture correction factor of the meter coefficient of the precession vortex flowmeter; ζ is a dimensionless parameter characterizing the volumetric flow of the wet gas phase; ζ is a dimensionless parameter characterizing the volumetric content of the wet gas liquid phase; q (Q) g Vapor phase volume flow of moisture, m 3 /h; f is the main frequency of the differential signal of vortex precession, hz; k is the single-phase instrument coefficient.
The application also provides a measuring device for measuring the moisture gas phase flow by utilizing the MEMS triaxial acceleration frequency information of the precession vortex, which comprises:
the triaxial acceleration sensor is combined with the pressure and temperature integrated sensor and is used for measuring the flow of the pipeline;
the power module is provided with a direct-current bias voltage output end and is used for filtering out the gravity bias voltage caused by the earth gravity acceleration;
the computing unit is used for carrying out differential processing on output signals of different axes in the triaxial acceleration sensor; obtaining a main frequency of a differential signal of vortex precession through Fourier transformation, and obtaining a single-phase instrument coefficient by utilizing the relationship between the vortex precession frequency and the single-phase gas flow;
and the wet gas flow solving unit is used for solving a wet gas metering model of the precession vortex flowmeter established by a dimension analysis method.
The application also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the moisture flow measurement method when executing the program.
The present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the moisture flow measurement method.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
1. the method can meet the moisture flow measurement requirement of a wider range, ensure strong vortex precession signals of each shaft and accurate measurement, realize the replacement of the traditional piezoelectric ceramic crystal technology and popularize the application field of moisture flow measurement.
2. The method can realize the measurement of the precession vortex signals of the pipeline fluid in three axial directions, and effectively overcome various other interference noise signals such as fluid pulsation noise, pipeline mechanical vibration and the like by utilizing the double-shaft differential signal processing method according to the difference of the acting force directions of the precession vortex signals and the interference noise signals, improves the signal precision, reduces the lower limit of flow measurement and widens the flow measurement range.
3. The method introduces the moisture correction factor of the meter coefficient of the precession vortex flowmeter, establishes the moisture metering model of the precession vortex flowmeter by utilizing the single-phase meter coefficient, the moisture correction factor and the main frequency of the differential signal based on a dimension analysis method, realizes the measurement of the moisture gas phase flow, has high prediction precision, is easy to be transplanted into signal microprocessors such as a singlechip and the like, and meets the requirements of the meter and the meter on stability and reliability.
Drawings
FIG. 1 is a schematic flow chart of the present application;
FIG. 2 is a schematic diagram of a mounting position of a triaxial acceleration sensor in a pipeline according to an embodiment of the present application;
FIG. 3 is a plot of the dominant frequency versus gas phase volumetric flow rate of a wet gas precession vortex differential signal provided by an embodiment of the present application;
FIG. 4 is a plot of the dominant frequency versus liquid phase volumetric fraction of a wet gas precession vortex differential signal provided by an embodiment of the present application;
fig. 5 shows the fitting relative error of the wet gas phase volume flow model according to the present application.
Reference numerals: 1-a spinning device; 2-precession vortex flowmeter; 3-derotator; a 4-triaxial acceleration sensor; 5-an auxiliary measuring shaft; 6-fluid main impact shaft; 7-precessing into a vortex sensitive axis; 8-warm-pressing integrated sensor
Detailed Description
The application is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The present embodiment provides a method for measuring wet gas phase flow using MEMS triaxial acceleration frequency information of a precession vortex, based on a precession vortex flowmeter equipped with triaxial acceleration sensors, see fig. 2, a gyrator 1 and a despin 3 are provided at front and rear ends of the precession vortex flowmeter 2, a triaxial acceleration sensor 4 is installed on the precession vortex flowmeter 2, and when pipe flow measurement is performed by the precession vortex flowmeter 2, in the triaxial acceleration sensor 4, a fluid main impact axis 6 is defined as being consistent with a fluid direction; a definition consistent with the direction of insertion of the pipe is an auxiliary measuring axis 5; a plane perpendicular to the direction of fluid and the direction of insertion is defined as a precession vortex sensitive axis 7; the throat of the flowmeter is provided with a temperature and pressure integrated sensor 8. The process of measuring the moisture flow of a pipeline by a precession vortex flowmeter is shown in fig. 1, and specifically comprises the following steps:
1) The temperature and pressure integrated sensor 8 is used for collecting the pressure P and the temperature T of an experimental pipeline, the vortex flowmeter is screwed in to measure the wet gas-liquid two-phase flow, the triaxial electrical signal is collected and output, and the gravity bias voltage in the output signal of the auxiliary measuring shaft 5 (Y-axis) is eliminated;
2) Differential processing is carried out on the output signal of the precession vortex sensitive shaft 7 (Z axis) or the fluid main impact shaft 6 (X axis) and the output signal of the auxiliary measuring shaft 5 (Y axis) after the gravity bias voltage is eliminated;
3) Taking the differential signals of the precession vortex sensitive axis 7 (Z axis) and the auxiliary measuring axis 5 (Y axis) as examples, extracting the main frequency f of the differential signals of the precession vortex by utilizing the Matalab internal integration function to carry out fast Fourier transform on the output signals after differential processing Z-Y ；
4) Using the main frequency f of the differential signal Z-Y And single-phase gas flow Q g To obtain the single-phase instrument coefficient K, K=f Z-Y /Q g ；
5) Repeating the steps (1) - (3) to measure the moisture and extract the main frequency f of the moisture differential signal Z-Y The method comprises the steps of carrying out a first treatment on the surface of the Introducing a moisture correction factor UR of meter coefficient of the precession vortex flowmeter, and utilizing the single-phase meter coefficient K, the moisture correction factor UR and a differential signal main frequency f based on a dimension analysis method Z-Y And establishing a moisture metering model of the precession vortex flowmeter to realize the measurement of moisture gas phase flow.
In this embodiment, the probe in which the triaxial acceleration sensor 4 is packaged is mounted in a precession vortex flowmeter with a gyrator 1 and a despin 3, wherein the body of the precession vortex flowmeter 2 resembles a venturi tube. The throat of the flowmeter is provided with a temperature and pressure integrated sensor 8. The triaxial acceleration sensor 4 is used for detecting a precession vortex precession frequency signal generated when fluid in the precession vortex flowmeter 2 reaches the expansion section through the throat. The triaxial acceleration sensor 4 has three axial directions, so that it has the capability of measuring three-dimensional acceleration of the pipeline fluid, wherein the main fluid impact axis 6 is consistent with the fluid direction, the auxiliary measuring axis 5 is consistent with the probe insertion direction, and the precession vortex sensitive axis 7 is perpendicular to a plane formed by the fluid direction and the probe insertion direction. Gas flow measurements and moisture measurements were made separately. In addition, a power module is arranged in the triaxial acceleration sensor, and a direct-current bias voltage output end is arranged on the power module and used for filtering out gravity bias voltage caused by earth gravity acceleration.
The measurement results are shown in fig. 3 and 4. FIGS. 3-4 reflect the primary frequency f of the differential signal Z-Y And the volume flow rate Q of gas phase g Between LVFs of liquid phase volume fractionsRelationship. From fig. 3, it can be seen that: in dry gas measurement, the main frequency f of differential signals Z-Y And the volume flow rate Q of gas phase g There is a linear positive correlation between, k=f Z-Y /Q g K is a single-phase instrument coefficient based on the triaxial acceleration sensor when the triaxial acceleration sensor is used for gas phase flow measurement. When moisture measurement is carried out, the relation does not change the rule of good linear output due to the addition of liquid phase, and when the volume content of the liquid phase LVF is fixed, the main frequency f of differential signals Z-Y With the volume flow rate Q of the gas phase g Is linearly increasing, conforms to the single-phase gas measurement characteristics of a precession vortex flowmeter, and even at a gas phase superficial flow rate u sg And when the frequency is low, the precession frequency of the vortex signal can be accurately extracted. However, the addition of the liquid phase changes the instrument coefficient K value, i.e., the slope of the curve, under wet gas conditions, with the K value decreasing as the LVF increases. From fig. 4, it can be seen that: when the apparent flow rate of the gas phase u sg At a certain time, the main frequency f of the differential signal Z-Y Gradually decreases as the liquid phase volume fraction LVF increases, and this decay rate gradually decreases. This is also why the use of a precession vortex flowmeter measures the "false low phenomenon" that occurs with moisture.
Therefore, the gas phase volume flow obtained by using the precession vortex flowmeter instrument coefficient K under the single-phase pure gas working condition in the wet gas metering is an uncorrected volume flow, further correction is needed, and the precession vortex flowmeter instrument coefficient wet gas correction factor UR is introduced to obtain the corrected wet gas phase volume flow Q g Specifically, the formula (1) can be represented. Based on dimensional analysis, it was found that the correction factor UR can be determined from the dimensionless parameter gas-phase friedel Fr characterizing the volumetric flow of the moisture gas phase g Parameter dimensionless Lockhart-Martinelli parameter X for characterizing moisture liquid phase volume fraction LM And the liquid-gas density ratio DR. The liquid-gas density ratio DR can be obtained by calculating the corresponding local gas phase density and liquid phase density through pipeline pressure P and temperature T acquired by a temperature-pressure integrated sensor. By measuring data under the wet gas working condition, a fitting expression of a correction factor UR is established, which can be specifically expressed as a formula (2), wherein, c 1 、c 2 、c 3 And n is a fitting coefficient. By least twoMultiplying the fitting coefficients to obtain a set of fitting coefficients c 1 ＝2.776,c 2 ＝0.192,c 3 ＝0.924,n＝-0.073。
The fitting error of the moisture vapor phase flow prediction model based on the differential signal main frequency of the triaxial MEMS acceleration sensor is shown in figure 5, the fitting relative error is within +/-2.0% as a whole, and Q is the same as that of the moisture vapor phase flow prediction model under the confidence probability interval g The relative error of (c) is + -1.478% (pc=95%, δ= + -1.96 σ), and the model prediction accuracy is good.
The embodiment of the application also provides a specific implementation mode of the electronic device capable of realizing all the steps in the wet air flow measuring method in the embodiment, and the electronic device specifically comprises the following contents:
a Processor (Processor), a Memory (Memory), a communication interface (Communications Interface), and a bus;
the processor, the memory and the communication interface complete communication with each other through buses; the communication interface is used for realizing information transmission among relevant equipment such as server-side equipment, metering equipment and user-side equipment.
The processor is configured to invoke the computer program in the memory, and when the processor executes the computer program, the processor implements all the steps in the method for measuring the flow rate of the wet gas in the above embodiment.
The embodiment of the present application also provides a computer-readable storage medium capable of realizing all the steps of the wet gas flow rate measurement method in the above embodiment, on which a computer program is stored, which when executed by a processor realizes all the steps of the wet gas flow rate measurement method in the above embodiment,
although the application provides method operational steps as an example or a flowchart, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.
Although the present description provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented in an actual device or end product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even in a distributed data processing environment) as illustrated by the embodiments or by the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, it is not excluded that additional identical or equivalent elements may be present in a process, method, article, or apparatus that comprises a described element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The application is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present application, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the application and scope of the claims, which are within the scope of the application.
Claims (5)
1. A method for measuring moisture gas phase flow by utilizing MEMS triaxial acceleration frequency information of precession vortex is based on a precession vortex flowmeter provided with a triaxial acceleration sensor, and a temperature-pressure integrated sensor is arranged at the throat of the flowmeter; when the pipeline flow is measured by the precession vortex flowmeter, the three-axis acceleration sensor is defined as a fluid main impact axis which is consistent with the fluid direction; a definition consistent with the direction of insertion of the pipe is an auxiliary measuring axis; a plane perpendicular to the direction of fluid and the direction of insertion defined as the axis of sensitivity of precession to a vortex, comprising the steps of:
(1) Acquiring pressure and temperature of an experimental pipeline through a temperature-pressure integrated sensor, measuring single-phase gas flow in the pipeline through a precession vortex flowmeter, acquiring triaxial electrical signal output, and eliminating gravity bias voltage in an auxiliary measuring shaft output signal;
(2) Differential motion is carried out on the output signal of the vortex sensitive shaft or the fluid main impact shaft and the output signal of the auxiliary measuring shaft after the gravity bias voltage is eliminated;
(3) Performing fast Fourier transform on the output signals after differential processing to extract the main frequency of the differential signals of the precession vortex;
(4) Obtaining a single-phase instrument coefficient by utilizing the relation between the main frequency of the differential signal and the single-phase gas flow;
(5) Repeating the steps (1) - (3) to perform moisture measurement and extracting the main frequency of the moisture differential signal; and introducing a moisture correction factor of the meter coefficient of the precession vortex flowmeter, and establishing a moisture metering model of the precession vortex flowmeter by utilizing the single-phase meter coefficient, the moisture correction factor and the main frequency of the differential signal based on a dimension analysis method to realize the measurement of the moisture gas phase flow.
2. The method for measuring the wet gas phase flow by utilizing the MEMS triaxial acceleration frequency information of the precession vortex according to claim 1, wherein a wet gas correction factor of an instrument coefficient of the precession vortex flowmeter is introduced in the step (5), a wet gas metering model of the precession vortex flowmeter is built by utilizing the single-phase instrument coefficient, the wet gas correction factor and a main frequency of a differential signal based on a dimension analysis method, and the measurement of the wet gas phase flow is realized, wherein the specific formula is as follows:
UR～f(ξ,ζ)
wherein UR is a moisture correction factor of the meter coefficient of the precession vortex flowmeter; ζ is a dimensionless parameter characterizing the volumetric flow of the wet gas phase; ζ is a dimensionless parameter characterizing the volumetric content of the wet gas liquid phase;Q g vapor phase volume flow of moisture, m 3 /h; f is the main frequency of the differential signal of vortex precession, hz; k is the single-phase instrument coefficient.
3. A measurement device for measuring moisture vapor phase flow rate using MEMS triaxial acceleration frequency information of precession vortex, comprising:
the triaxial acceleration sensor is combined with the pressure and temperature integrated sensor and is used for measuring the flow of the pipeline;
the power module is provided with a direct-current bias voltage output end and is used for filtering out the gravity bias voltage caused by the earth gravity acceleration;
the computing unit is used for carrying out differential processing on output signals of different axes in the triaxial acceleration sensor; obtaining a main frequency of a differential signal of vortex precession through Fourier transformation, and obtaining a single-phase instrument coefficient by utilizing the relationship between the vortex precession frequency and the single-phase gas flow;
and the wet gas flow solving unit is used for solving a wet gas metering model of the precession vortex flowmeter established by a dimension analysis method.
4. 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 implements the steps of the method for measuring the flow of moisture according to any one of claims 1 to 2 when the program is executed by the processor.
5. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the method for measuring the flow of wet gas as claimed in any one of claims 1 to 2.
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