CN116878597A - Method for measuring flow of flowing mixed gas based on ultrasonic flowmeter - Google Patents
Method for measuring flow of flowing mixed gas based on ultrasonic flowmeter Download PDFInfo
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- CN116878597A CN116878597A CN202310937926.2A CN202310937926A CN116878597A CN 116878597 A CN116878597 A CN 116878597A CN 202310937926 A CN202310937926 A CN 202310937926A CN 116878597 A CN116878597 A CN 116878597A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 179
- 239000007789 gas Substances 0.000 claims description 78
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 59
- 238000010521 absorption reaction Methods 0.000 claims description 56
- 239000001257 hydrogen Substances 0.000 claims description 51
- 229910052739 hydrogen Inorganic materials 0.000 claims description 51
- 238000005314 correlation function Methods 0.000 claims description 30
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 9
- 150000002431 hydrogen Chemical class 0.000 claims description 8
- 230000000284 resting effect Effects 0.000 claims description 4
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/663—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by measuring Doppler frequency shift
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Combustion & Propulsion (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The application provides a method for measuring the flow rate of flowing mixed gas based on an ultrasonic flowmeter, which is used for obtaining the concentration value of each component in the mixed gas through measurement and calculation, so that the static speed of the current mixed gas is obtained according to the concentration value, the fluid speed is obtained according to the difference between the flow speed and the static speed, and the flow value is obtained, namely, the concentration value of the component in the mixed gas is obtained while the flow rate of the mixed gas is measured.
Description
Technical Field
The application relates to the technical field of gas ultrasonic flow measurement, in particular to a method for measuring flow of flowing mixed gas based on an ultrasonic flowmeter.
Background
At present, the domestic flowmeter applied to natural gas metering and delivery management is mainly a Roots meter and a turbine meter, and the two metering meters are mechanical metering meters, so that inherent weaknesses of the mechanical meters are difficult to get rid of, for example, the natural gas metering meters are high in quality requirement and easy to clamp, frequent in maintenance and high in maintenance cost, and meanwhile, along with the increase of the caliber of a natural gas delivery pipeline, the volume, the weight and the price of the two mechanical metering meters can be greatly increased, and the weaknesses seriously restrict the natural gas metering and pipe network delivery management to develop towards the directions of accuracy, stability, intelligence and high efficiency. In order to overcome the defects of the mechanical metering device, an ultrasonic flowmeter appears in the prior art, and the current measuring method of the ultrasonic flowmeter can only measure the flow of the mixed gas, but cannot know the concentration value of each component in the mixed gas.
Disclosure of Invention
The application aims to overcome the problems in the prior art and provide a method for measuring the flow rate of flowing mixed gas based on an ultrasonic flowmeter, wherein the method for measuring the flow rate of the flowing mixed gas obtains the concentration value of components in the mixed gas while measuring the flow rate of the mixed gas.
In order to achieve the technical purpose and the technical effect, the application is realized by the following technical scheme:
the application provides a method for measuring the flow rate of flowing mixed gas based on an ultrasonic flowmeter, which comprises the following steps:
obtaining relaxation absorption amplitude A of pure hydrogen and pure methane in static scene Hydrogen gas 、A Methane And a corresponding relaxation frequency f i Hydrogen gas 、f i methane Then obtaining the relaxation absorption amplitude A 'of the pure hydrogen and the pure methane under the flowing scenes of different flow rates' Hydrogen 1 ～A' Hydrogen x 、A' Methane 1 ～A' Methane x And a corresponding relaxation frequency f' Hydrogen 1 ～f' Hydrogen x 、f' Methane 1 ～f' Methane x Processing the data to obtain an error correlation function Y (A) and an error correlation function Y (f) i )；
Acquiring the relaxation absorption amplitude A of the mixed gas N obtained by mixing the hydrogen and the methane under different concentration ratios N1 ～A Nx And a corresponding relaxation frequency f iN1 ～f iNx Establishing a data sample library with different concentrations;
performing transit time calculation on the acquired original data to obtain transit time t, thereby obtaining the ultrasonic propagation speed V of the current mixed gas N Flow of ；
Under the flowing scene, the relaxation absorption amplitude A of the current mixed gas N is obtained N And a corresponding relaxation frequency f iN The relaxation absorption amplitude A N And the corresponding relaxation frequency f iN With the error correlation function Y (A) and the error correlation function Y (f) i ) Performing difference operation to eliminate errors and obtain the real relaxation absorption amplitude A 'of the current mixed gas N' N And a corresponding true relaxation frequency f' iN ；
The amplitude A 'absorbed by the relaxation' N And the relaxation frequency f' iN Calculating the concentration percentage of one of the current mixed gases N, and comparing the concentration percentages with the data sample library to obtain a concentration value rho of one of the current mixed gases N; and
obtaining the static speed V of the current mixed gas N according to the concentration value rho of one gas in the current mixed gas N Rest Thereby obtaining the velocity V of the current mixed gas N Fluid body And a flow rate Q of the fluid.
In one embodiment of the present application, the method for obtaining the error correlation function Y (a) includes the steps of:
the relaxation absorption amplitude A' Hydrogen 1 ～A' Hydrogen x Respectively with the relaxation absorption amplitude A Hydrogen gas Performing a difference operation to obtain the relaxation absorption amplitude increment delta A of the pure hydrogen Hydrogen 1 ～ΔA Hydrogen x The relaxation absorption amplitude A' Methane 1 ～A' Methane x Respectively with the relaxation absorption amplitude A Methane Performing difference operation to obtain the relaxation absorption amplitude increment delta A of the pure methane Methane 1 ～ΔA Methane x ；
The relaxation absorption amplitude increment delta A Hydrogen 1 ～ΔA Hydrogen x Delta A from the relaxation absorption amplitude Methane 1 ～ΔA Methane x Performing mean value operation in dimensions to obtain average value delta A of relaxation absorption amplitude increment under different flow velocity flow scenes 1avg ～ΔA xavg The method comprises the steps of carrying out a first treatment on the surface of the And
for the average value delta A 1avg ～ΔA xavg And performing least square method correlation function fitting to obtain the error correlation function Y (A).
In one embodiment of the application, the error correlation function Y (f i ) The obtaining method of (1) comprises the following steps:
the relaxation frequency f' i Hydrogen 1 ～f' i Hydrogen x Respectively with the relaxation absorption amplitude f i Hydrogen gas Performing a difference operation to obtain the relaxation frequency increment delta f of the pure hydrogen i Hydrogen 1 ～Δf i Hydrogen x The relaxation frequency f' Methane 1 ～f' Methane x Respectively with the relaxation frequency f i methane Performing difference operation to obtain relaxation frequency increment delta f of the pure methane i methane 1 ～Δf i methane x ；
The relaxation frequency increment Deltaf i Hydrogen 1 ～Δf i Hydrogen x Delta f from the relaxation frequency i methane 1 ～Δf i methane x Performing mean operation in dimensions to obtain average delta f of relaxation frequency increment under different flow velocity flow scenes i1avg ～Δf ixavg The method comprises the steps of carrying out a first treatment on the surface of the And
for the average value Deltaf i1avg ～Δf ixavg Fitting least square method correlation functions to obtain the error correlation function Y (f) i )。
In one embodiment of the application, the resting velocity V Rest Can be calculated by the formulaObtained.
In one embodiment of the application, the velocity V of the present mixture N Fluid body Can be calculated by formula V Fluid body ＝V Flow of -V Rest Obtained.
In one embodiment of the present application, the raw data is obtained by measuring and collecting the inside of the pipeline filled with the pure hydrogen and the pure methane by an ultrasonic flowmeter under different flow rate scenes.
In one embodiment of the application, the ultrasonic propagation velocity V of the present mixed gas N Flow of Can be calculated by formula V Flow of Obtained by =l/t, where L is the ultrasonic propagation path length.
In summary, the present application provides a method for measuring a flow rate of a flowing mixed gas based on an ultrasonic flowmeter, where the method for measuring the flow rate of the flowing mixed gas obtains a concentration value of each component in the mixed gas through measurement and calculation, so as to obtain a current static velocity of the mixed gas according to the concentration value, obtain a fluid velocity according to a difference between the flow velocity and the static velocity, and obtain a flow value, that is, obtain the concentration value of the component in the mixed gas while measuring the flow rate of the mixed gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is an overall flow chart of the present application for measuring the flow of a flowing mixture gas;
FIG. 2 is a flow chart of the present application for obtaining an error correlation function Y (A);
FIG. 3 is a graph of the obtained error correlation function Y (f i ) Is a flow chart of (2); the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 4 is a graph of the relaxation absorption amplitude A versus the relaxation frequency pressure ratio f/p of the present application;
FIG. 5 is a graph of hydrogen concentration versus relaxation absorption amplitude A plotted based on a database of data samples in accordance with the present application;
FIG. 6 is a schematic diagram of an ultrasonic flow meter in one embodiment of the application;
fig. 7 is a schematic view of an ultrasonic flow meter according to another embodiment of the present application.
The reference numerals in the figures illustrate: 1-first transducer, 2-second transducer, 3-reflector plate, 4-measuring tube body.
Detailed Description
The application will be described in detail below with reference to the drawings in combination with embodiments.
Referring to fig. 1, the present application provides a method for measuring a flow rate of a flowing mixed gas based on an ultrasonic flowmeter, wherein the method for measuring the flow rate of the flowing mixed gas obtains a concentration value of a component in the mixed gas while measuring the flow rate of the mixed gas. Specifically, the method for measuring the flow rate of the flowing mixed gas comprises the following steps S1 to S6:
s1, obtaining relaxation absorption amplitude A of pure hydrogen and pure methane in static scene Hydrogen gas 、A Methane And a corresponding relaxation frequency f i Hydrogen gas 、f i methane Then obtaining the relaxation absorption amplitude f of the pure hydrogen and the pure methane under the flowing scenes of different flow rates i Hydrogen gas 、f i methane And a corresponding relaxation frequency f' Hydrogen 1 ～f' Hydrogen x 、f' Methane 1 ～f' Methane x Processing the data to obtain an error correlation function Y (A) and an error correlation function Y (f) i ). Specifically, the formula is firstly adoptedCalculating the relaxation intensity D of the pure hydrogen and the pure methane Hydrogen gas And D Methane Wherein R is molar gas constant, C' is corresponding to internal vibration heat capacity of gas, C ∞ Is corresponding to the heat capacity of the external degree of freedom of the gas. And then according to the formula->Calculating the relaxation absorption amplitude A of pure hydrogen and pure methane Hydrogen gas And A Methane Where λ is the wavelength of the ultrasonic wave, a is the speed of sound, f is the frequency of the sound wave, D i And f i The relaxation intensity and the relaxation frequency of the corresponding gas, respectively. Since different flow rates can influence the relaxation intensity D of the gas, the relaxation absorption amplitude A 'of the pure hydrogen and the pure methane under the flow scene of different flow rates is calculated according to the formula' Hydrogen 1 ～A' Hydrogen x 、A' Methane 1 ～A' Methane x Then, according to the graph shown in FIG. 4, the relaxation absorption amplitude A 'is obtained' Hydrogen 1 ～A' Hydrogen x 、A' Methane 1 ～A' Methane x Corresponding relaxation frequency f' Hydrogen 1 ～f' Hydrogen x 、f' Methane 1 ～f' Methane x 。
Referring to fig. 2, in one embodiment of the present application, the method for obtaining the error correlation function Y (a) includes the following steps S10 to S12:
s10 absorption amplitude A 'of relaxation' Hydrogen 1 ～A' Hydrogen x Respectively with relaxation absorption amplitude A Hydrogen gas Performing difference operation to obtain relaxation absorption amplitude increment delta A of pure hydrogen Hydrogen 1 ～ΔA Hydrogen x Relaxation absorption amplitude A' Methane 1 ～A' Methane x Respectively with relaxation absorption amplitude A Methane Performing difference operation to obtain the relaxation absorption amplitude increment delta A of the pure methane Methane 1 ～ΔA Methane x ；
S11 relaxation absorption amplitude delta A Hydrogen 1 ～ΔA Hydrogen x Delta A of absorption amplitude of relaxation Methane 1 ～ΔA Methane x Performing mean value operation in dimensions to obtain average value delta A of relaxation absorption amplitude increment under different flow velocity flow scenes 1avg ～ΔA xavg The method comprises the steps of carrying out a first treatment on the surface of the And
s12 pair average value DeltaA 1avg ～ΔA xavg And performing least square method correlation function fitting to obtain an error correlation function Y (A).
Referring to fig. 3, in one embodiment of the present application, the error correlation function Y (f i ) The obtaining method of the method comprises the following steps S13 to S15:
s13 relaxation frequency f' i Hydrogen 1 ～f' i Hydrogen x Respectively with relaxation absorption amplitude f i Hydrogen gas Performing difference operation to obtain relaxation frequency increment f of pure hydrogen i Hydrogen gas Relaxation frequency f' Methane 1 ～f' Methane x Respectively with relaxation frequency f i methane Performing difference operation to obtain relaxation frequency increment delta f of pure methane i methane 1 ～Δf i methane x ；
S14 relaxation frequency delta Δf i Hydrogen 1 ～Δf i Hydrogen x And relaxation frequency delta deltaf i methane 1 ～Δf i methane x Performing mean operation in dimensions to obtain average delta f of relaxation frequency increment under different flow velocity flow scenes i1avg ～Δf ixavg The method comprises the steps of carrying out a first treatment on the surface of the And
s15 pair of average values Δf i1avg ～Δf ixavg Respectively performing minimumFitting the square correlation function to obtain the error correlation function Y (f i )。
Referring to fig. 1, S2 obtains the amplitude a of relaxation absorption of a mixed gas N obtained by mixing hydrogen and methane at different concentration ratios N1 ～A Nx And a corresponding relaxation frequency f iN1 ～f iNx And establishing a data sample library of different concentrations. Specifically, the concentration of hydrogen is changed from 0% to 100%, the concentration of methane is changed from 100% to 0%, and the relaxation absorption amplitude A under different concentration ratios is measured N1 ～A Nx And a corresponding relaxation frequency f iN1 ～f iNx A database based on different concentrations is formed. For example, the hydrogen concentration may be plotted on the abscissa as a graph shown in fig. 5.
Referring to fig. 1, 6 and 7, S3 calculates the transit time of the obtained raw data to obtain the transit time t, thereby obtaining the ultrasonic propagation velocity V of the current mixed gas N Flow of . Specifically, the original data is obtained by measuring and collecting the inside of a pipeline filled with pure hydrogen and pure methane by an ultrasonic flowmeter under different flow rate scenes. The ultrasonic flowmeter comprises a measuring pipe body and a first transducer 1 and a second transducer 2 which are arranged on the measuring pipe body 4, wherein the first transducer 1 and the second transducer 2 can be positioned on one side of the measuring pipe body 4 or can be positioned on two sides of the measuring pipe body 4. The first transducer 1 emits an ultrasonic signal and the second transducer 2 receives the ultrasonic signal. When the first transducer 1 and the second transducer 2 are located at two sides of the measuring tube body 4, the transmitting plate 3 is further disposed in the measuring tube body 4 and is used for reflecting the ultrasonic signals transmitted by the first transducer 1 to the second transducer 2. The ultrasonic signal propagation path length between the first transducer 1 and the second transducer 2 is L. Ultrasonic propagation velocity V of the present mixed gas N Flow of Can be calculated by formula V Flow of Obtained by =l/t, where L is the ultrasonic propagation path length.
Referring to fig. 1, S4 obtains the relaxation absorption amplitude a of the current mixed gas N in a flowing scene N And a corresponding relaxation frequency f iN Absorption amplitude A of relaxation N And a corresponding relaxation frequency f iN With error-related function Y (A) and error-related function Y (f) i ) Performing difference operation to eliminate errors and obtain the actual relaxation absorption amplitude A 'of the current mixed gas N' N And a corresponding true relaxation frequency f' iN 。
Referring to FIG. 1, S5 is the amplitude A 'absorbed by relaxation' N And relaxation frequency f' iN And calculating the concentration percentage of one of the gases in the current mixed gas N, and comparing the concentration percentage with a data sample library to obtain the concentration value rho of one of the gases in the current mixed gas N. Specifically, the amplitude A 'of the relaxation absorption' N And relaxation frequency f' iN As a reference value, the amplitude A 'of the current relaxation absorption is read on a graph as shown in FIG. 1' N And relaxation frequency f' iN The concentration of hydrogen p and methane is 1-p.
Referring to fig. 1, S6 obtains a resting velocity V of the current mixed gas N according to a concentration value ρ of one of the current mixed gas N Rest Thereby obtaining the speed V of the current mixed gas N Fluid body And a flow rate Q of the fluid. In particular, the resting speed V Rest Can be calculated by the formulaObtained, wherein gamma is the adiabatic coefficient, R is the molar gas constant, T is the temperature, M H2 Is the molar mass of hydrogen, M CH4 Is the molar mass of methane. Velocity V of the current mixture gas N Fluid body Can be calculated by formula V Fluid body ＝V Flow of -V Rest Obtained. If V Fluid body Positive, i.e. the ultrasound propagation direction is the same as the gas flow direction, i.e. downstream, if V Fluid body Negative, i.e. the ultrasound propagation direction is opposite to the gas flow direction, i.e. countercurrent. Then, the flow rate Q of the body is calculated according to the flow rate formula of the fluid, namely Q=V Fluid body *t*π(h/2) 2 Wherein h is the diameter of the measuring tube body.
In summary, the present application provides a method for measuring a flow rate of a flowing mixed gas based on an ultrasonic flowmeter, where the method for measuring the flow rate of the flowing mixed gas obtains a concentration value of each component in the mixed gas through measurement and calculation, so as to obtain a current static velocity of the mixed gas according to the concentration value, obtain a fluid velocity according to a difference between the flow velocity and the static velocity, and obtain a flow value, that is, obtain the concentration value of the component in the mixed gas while measuring the flow rate of the mixed gas.
The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made without departing from the spirit and scope of the application, which is defined in the appended claims.
Claims (7)
1. A method for measuring the flow rate of a flowing mixed gas based on an ultrasonic flowmeter, comprising the steps of:
obtaining relaxation absorption amplitude A of pure hydrogen and pure methane in static scene Hydrogen gas 、A Methane And a corresponding relaxation frequency f i Hydrogen gas 、f i methane Then obtaining the relaxation absorption amplitude A 'of the pure hydrogen and the pure methane under the flowing scenes of different flow rates' Hydrogen 1 ～A′ Hydrogen x 、A′ Methane 1 ～A′ Methane x 'and the corresponding relaxation frequency f' Hydrogen 1 ～f′ Hydrogen x 、f′ Methane 1 ～f′ Methane x Processing the data to obtain an error correlation function Y (A) and an error correlation function Y (f) i )；
Acquiring the relaxation absorption amplitude A of the mixed gas N obtained by mixing the hydrogen and the methane under different concentration ratios N1 ～A Nx And a corresponding relaxation frequency f iN1 ～f iNx Establishing a data sample library with different concentrations;
performing transit time calculation on the acquired original data to obtain transit time t, thereby obtaining the ultrasonic propagation speed of the current mixed gas NDegree V Flow of ；
Under the flowing scene, the relaxation absorption amplitude A of the current mixed gas N is obtained N And a corresponding relaxation frequency f iN The relaxation absorption amplitude A N And the corresponding relaxation frequency f iN With the error correlation function Y (A) and the error correlation function Y (f) i ) Performing difference operation to eliminate errors and obtain the real relaxation absorption amplitude A 'of the current mixed gas N' N And a corresponding true relaxation frequency f' iN ；
The amplitude A 'absorbed by the relaxation' N And the relaxation frequency f' iN Calculating the concentration percentage of one of the current mixed gases N, and comparing the concentration percentages with the data sample library to obtain a concentration value rho of one of the current mixed gases N; and
obtaining the static speed V of the current mixed gas N according to the concentration value rho of one gas in the current mixed gas N Rest Thereby obtaining the velocity V of the current mixed gas N Fluid body And a flow rate Q of the fluid.
2. Method for measuring the flow of a flowing mixture of gases according to claim 1, characterized in that the method for obtaining the error correlation function Y (a) comprises the steps of:
the relaxation absorption amplitude A' Hydrogen 1 ～A′ Hydrogen x Respectively with the relaxation absorption amplitude A Hydrogen gas Performing a difference operation to obtain the relaxation absorption amplitude increment delta A of the pure hydrogen Hydrogen 1 ～ΔA Hydrogen x The relaxation absorption amplitude A' Methane 1 ～A′ Methane x Respectively with the relaxation absorption amplitude A Methane Performing difference operation to obtain the relaxation absorption amplitude increment delta A of the pure methane Methane 1 ～ΔA Methane x ；
The relaxation absorption amplitude increment delta A Hydrogen 1 ～ΔA Hydrogen x Delta A from the relaxation absorption amplitude Methane 1 ～ΔA Methane x Average value operation is carried out in dimension to obtain different flow ratesAverage value delta A of relaxation absorption amplitude increment in flow scene 1avg ～ΔA xavg The method comprises the steps of carrying out a first treatment on the surface of the And
for the average value delta A 1avg ～ΔA xavg And performing least square method correlation function fitting to obtain the error correlation function Y (A).
3. The method of measuring the flow of a flowing gas mixture according to claim 1, wherein the error correlation function Y (f i ) The obtaining method of (1) comprises the following steps:
the relaxation frequency f' i Hydrogen 1 ～f′ i Hydrogen x Respectively with the relaxation absorption amplitude f i Hydrogen gas Performing a difference operation to obtain the relaxation frequency increment delta f of the pure hydrogen i Hydrogen 1 ～Δf i Hydrogen x The relaxation frequency f' Methane 1 ～f′ Methane x Respectively with the relaxation frequency f i methane Performing difference operation to obtain relaxation frequency increment delta f of the pure methane i methane 1 ～Δf i methane x ；
The relaxation frequency increment Deltaf i Hydrogen 1 ～Δf i Hydrogen x Delta f from the relaxation frequency i methane 1 ～Δf i methane x Performing mean operation in dimensions to obtain average delta f of relaxation frequency increment under different flow velocity flow scenes i1avg ～Δf ixavg The method comprises the steps of carrying out a first treatment on the surface of the And
for the average value Deltaf i1avg ～Δf ixavg Fitting least square method correlation functions to obtain the error correlation function Y (f) i )。
4. The method of measuring the flow of a flowing gas mixture according to claim 1 wherein the resting velocity V Rest Can be calculated by the formulaObtained.
5. The measurement flow mixture of claim 4A method for the volume flow is characterized in that the speed V of the current mixed gas N Fluid body Can be calculated by formula V Fluid body ＝V Flow of -V Rest Obtained.
6. The method for measuring the flow rate of the flowing mixed gas according to claim 1, wherein the raw data is obtained by measuring and collecting the inside of the pipeline filled with the pure hydrogen and the pure methane by an ultrasonic flowmeter under different flow rate scenes.
7. The method of measuring the flow of a flowing gas mixture according to claim 1, wherein the ultrasonic propagation velocity V of the present gas mixture N Flow of Can be calculated by formula V Flow of Obtained by =l/t, where L is the ultrasonic propagation path length.
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