CN110726444A - Wet gas flow metering method and device based on Coriolis mass flowmeter - Google Patents
Wet gas flow metering method and device based on Coriolis mass flowmeter Download PDFInfo
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Abstract
The invention discloses a wet gas flow measuring method and device based on a Coriolis mass flowmeter, wherein the Coriolis mass flowmeter measures total mass flow QmMixed density ρmixThe medium temperature T; the sensor combination measures the differential pressure delta P at the inlet and the outlet, the flow calculation module carries out multi-physical field coupling calculation to obtain the average air density rhog(ii) a According to the mixing density rhomixAverage air density ρgLiquid tightness ρlCalculating the mass liquid content eta of the mixed mediummThrough mass liquid content ηmMedium temperature T and mean pressure P versus total mass flow QmCorrecting to obtain corrected total mass flow Qm ’According to total mass flow Qm ’And mass liquid content ηmAnd calculating the two-phase flow. Coupled calculation of multiple physical fields, air density rhogCorrecting to obtain accurate mass liquid content rate etamAnd total mass flow rate Qm ’And calculating to obtain the gas-liquid two-phase flow. The metering mode and the data obtained by the device have higher accuracy.
Description
Technical Field
The invention relates to the technical field of wet gas flowmeters, in particular to a wet gas flow metering method and device based on a Coriolis mass flowmeter.
Background
In the natural gas exploitation process, a small amount of liquid substances are often accompanied, and due to the existence of the liquid substances, the traditional gas flow metering device cannot work normally or has serious deviation, so that the metering problem of the gas containing liquid becomes a problem which is urgently needed to be solved in the oil and gas industry.
In a scene containing a gas-liquid two-phase medium, a considerable proportion of the medium is the case where the liquid content is very low and the flow state is relatively stable, and generally, the medium with the liquid content below 5% in volume is classified as moisture. Compared with the multiphase flow in a wide sense, the flow shape and the flow state of the moisture are relatively simple, and the components are gas-liquid two phases.
The Coriolis mass flowmeter can measure the mass flow of a medium, and can also measure the density and the temperature of the medium, the Coriolis mass flowmeter can be used for measuring the moisture flow by utilizing the capabilities of the Coriolis mass flowmeter and measuring other physical quantities, the existing device for trying to measure the moisture by utilizing the Coriolis mass flowmeter is used for connecting the Coriolis mass flowmeter with an orifice plate flowmeter (or a similar flowmeter) in series, and the flow rate of a gas-liquid two-phase medium is obtained by data processing of the two flowmeters so as to achieve the purpose of measuring the two-phase flow. However, the method has the problems that the two flowmeters have different measurement positions and different working conditions, the main component of the medium is gas, the pressure and the temperature are different along with the flow resistance, the measurement of the two positions cannot be simply corresponded, and in view of physical principle, the upstream and downstream relation can be corrected by some models to achieve the aim, but the measurement is not direct, and corresponding uncertainty is brought.
Disclosure of Invention
In view of the defects in the prior art, a first object of the present invention is to provide a coriolis-based wet gas flow measurement method, in which a single coriolis-based mass flow meter is used for data measurement, and multi-physical-field coupling calculation is combined, so that the obtained gas-liquid two-phase data has high accuracy.
In order to achieve the purpose, the invention provides the following technical scheme: a wet gas flow metering method based on a Coriolis mass flowmeter, comprising the steps of:
coriolis mass flowmeter for measuring mass flow Q in a pipemMixed density ρmixThe medium temperature T;
a sensor assembly for measuring pressure P at the inlet and outlet of the coriolis mass flowmeter;
the flow calculation module performs multi-physical field coupling calculation, calculates pressure P of a corresponding position according to different positions X in the measuring pipeline of the Coriolis mass flowmeter, and generates a function curve between the position and the pressure;
the flow calculation module calculates the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a function curve;
the flow calculation module calculates an average air density rho according to the average pressure Pg；
The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρl(constant), calculating the mass liquid content rate eta of the mixed mediumm；
The flow calculation module is used for calculating the liquid content eta according to the mass of the mixed mediummAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’；
The flow calculation module is used for calculating the liquid content eta according to the massmAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql。
The second objective of the present invention is to provide a wet gas flow measuring device based on a coriolis force mass flowmeter, which includes a coriolis force mass flowmeter, and further includes a pipeline, a flow calculating module, and a sensor group, the sensor group is installed on the pipeline, wherein:
a duct for transporting moisture;
the sensor group is used for measuring the differential pressure delta P between an inlet and an outlet in the pipeline;
the flow calculation module is used for performing multi-physical field coupling calculation, and calculating the pressure P of a corresponding position according to different positions X in the pipeline measured by the Coriolis mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a function curve; and calculating the average air density rho through the average pressure Pg(ii) a Then according to the mixed density rhomixAverage air density ρgLiquid tightness ρl(constant), calculating the mixtureMass liquid content of the mixed medium etam(ii) a From the mass liquid content of the mixed medium etamAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’(ii) a Finally according to the mass liquid content rate etamAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql。
Further setting the following steps: the sensor combination comprises a pressure sensor and a differential pressure sensor, and the pressure is measured at the inlet of the Coriolis mass flowmeter, the differential pressure delta P at the inlet and the outlet is measured, and the mixed density rho is combinedmixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
Further setting the following steps: the sensor combination comprises two pressure sensors, the actual differential pressure delta P is obtained by measuring the pressure at the inlet and the outlet of the Coriolis mass flowmeter, and the actual differential pressure delta P is combined with the mixed density rhomixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
Further setting the following steps: the step of calculating the average pressure P in the measuring pipe of the Coriolis mass flowmeter by the flow calculation module through the function curve comprises the following steps:
and calculating to obtain the average pressure P by using a calculus area solving mode.
Further setting the following steps: the flow calculation module utilizes a formula according to the pressure and the temperature in combination with a PVT equation of a gas-phase medium:finally obtaining the average air density rhog。
Calculating air density ρgP, T are the pressure and absolute temperature, ρ, in the coriolis mass flowmeter, respectively, in the measurement tube0，P0And T0Respectively, air density, pressure and absolute temperature in a calibration state.
Further setting the following steps: the flow calculation module specifically utilizes the formula:
calculating the mass liquid content eta of the mixed mediumm，ρmixIs a mixture density, rhogIs mean air density, plIs the liquid density.
Further setting the following steps: the flow calculation module is used for calculating the liquid content eta according to the mass of the mixed mediummAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’The specific correction formula is as follows: qm ’＝ f（ P，T，ηm，Ｑm）
Further setting the following steps: the flow calculation module specifically utilizes formula Qg=Ｑm ’*（1-ηm) Calculating the gas mass flow QgUsing the formula Ql=Ｑm ’*ηmCalculating the liquid mass flow Ql。
Further setting the following steps: a temperature sensor is arranged in a housing of the Coriolis mass flowmeter and attached to a measuring tube of the Coriolis mass flowmeter.
The invention measures the total mass flow Q through the Coriolis mass flowmetermMixed density ρmixThe medium temperature T; the pressure difference delta P between the inlet and the outlet is measured by the sensor combination, and then the mixed density rho is combinedmixAcquiring the average pressure P in a measuring pipe of the Coriolis force mass flowmeter through a fluid mechanics calculation model CFD, performing multi-physical field coupling calculation through a flow calculation module, and calculating the pressure P at the corresponding position according to different positions X in the measuring pipe of the Coriolis force mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring tube of the Coriolis mass flowmeter in a mode of combining a function curve with a calculus area solution; and calculating the average air density rho by combining the average pressure P with the PVT equationg(ii) a The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρlCalculating the mass liquid content eta of the mixed mediummThrough mass liquid content ηmFor total mass flow QmCorrecting to obtain corrected total mass flow Qm ’Finally according to the total mass flow Qm ’And mass liquid content ηmCalculating the gas mass flow QgAnd liquid mass flow rate Ql。
Carrying out data measurement through a single Coriolis mass flowmeter, combining with multi-physical field coupling calculation, calculating to obtain accurate average pressure P, and further carrying out air density rhogCorrecting the air tightness rho according to the actual working conditiongCalculating to obtain accurate mass liquid content rate etamAnd the total mass flow Q according with the actual situationm ’And finally calculating to obtain the gas-liquid two-phase flow. The metering mode of the wet air flow and the data obtained by the device calculation have higher accuracy.
Drawings
FIG. 1 is a front view of a Coriolis mass flowmeter-based wet gas flow metering device of the present invention (first embodiment of a sensor assembly);
FIG. 2 is a top view of a Coriolis mass flowmeter-based wet gas flow metering device of the present invention (first embodiment of a sensor assembly);
FIG. 3 is a front view of a Coriolis mass flowmeter-based wet gas flow metering device of the present invention (embodiment two of the sensor assembly);
FIG. 4 is a top view of a Coriolis mass flowmeter-based wet gas flow metering device of the present invention (embodiment two of the sensor assembly);
FIG. 5 is a Coriolis mass flowmeter measuring different positions X in a pipeline, calculating pressures P corresponding to the positions and generating a simulation function curve between the positions and the pressures;
FIG. 6 is a Coriolis mass flowmeter measuring different locations X within a pipe, calculating a pressure P corresponding to the location and generating a function curve between the location and the pressure;
FIG. 7 is a plot of flow rate multiplier versus mass liquid fraction;
FIG. 8 is a table comparing the standard condition and the flow data before and after correction;
FIG. 9 is a graph comparing raw data traffic;
FIG. 10 is a graph comparing total flow after correction;
fig. 11 is a graph comparing the measurement results.
Reference numerals: 1. a coriolis force mass flowmeter; 2. a differential pressure sensor; 3. a pressure sensor; 4. a processing unit; 5. a flow calculation module; 6. an inlet; 7. and (7) an outlet.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
A wet gas flow metering method based on a Coriolis mass flowmeter comprises the following specific metering methods:
coriolis mass flowmeter 1 for measuring mass flow Q in a pipelinemMixed density ρmixAnd the temperature T of the medium.
Referring to fig. 1 and 2, the sensor combination comprises a pressure sensor 3 and a differential pressure sensor 2, and the mixing density ρ is determined by measuring the pressure at the inlet 6 of the coriolis mass flowmeter 1 and measuring the differential pressure Δ P at the inlet 6 and the outlet 7 of the coriolis mass flowmetermixAnd obtaining the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
As shown in fig. 3 and 4, the sensor assembly may further include two pressure sensors 3, which measure the pressure at the inlet 6 and the outlet 7 of the coriolis mass flowmeter 1 to obtain the actual differential pressure Δ P, and combine the mixing density ρmixAnd obtaining the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
It should be noted that the above two sensor modes can achieve the purpose of measurement, and in the specific implementation process, the actual differential pressure Δ P can also be measured by other sensors in different combinations.
The flow calculation module performs multi-physics coupling calculation, calculates pressure P at corresponding positions according to different positions X in a measuring pipeline of the Coriolis mass flowmeter, and generates a function curve (see fig. 5 and 6 in particular), wherein the abscissa in fig. 5 and 6 corresponds to the different positions X in the measuring pipeline of the Coriolis mass flowmeter, the measuring unit is meter, the ordinate corresponds to the pressure P, the measuring unit is megapascal, and the average pressure P in the measuring pipeline of the Coriolis mass flowmeter is calculated through the function curve.
The flow calculation module calculates the average pressure P in the measuring tube of the Coriolis mass flowmeter by combining a function curve with a calculus area solving mode.
The flow calculation module combines the PVT equation of the gas-phase medium and the gas state equation according to the pressure P at different positions: PV = ε nRT, and the gas density ρgProportional to the pressure P and inversely proportional to the temperature T, it follows that the measurement of pressure and temperature is necessary and is a key quantity for obtaining the gas density, and that the volume V changes when the pressure P changes, provided that the effect of the temperature field is not taken into account;
using the formula:
finally obtaining the average air density rhog。
Calculating air density ρgP, T are the pressure and absolute temperature, ρ, in the coriolis mass flowmeter, respectively, in the measurement tube0，P0And T0Respectively, air density, pressure and absolute temperature in a calibration state.
The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρlUsing the formula:
calculating the mass liquid content eta of the mixed mediumm；
The flow calculation module is used for calculating the liquid content eta according to the mass of the mixed mediummAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’Step (2) of the concrete correctionFormula (II):
Ｑm ’＝ f（ P，T，ηm，Ｑm）；
in the actual calculation process, the data of a plurality of discrete point positions are measured through a flow calculation module, and an accurate calculation function is obtained through generating a function curve through the data of a plurality of groups of discrete point positionsmFor total mass flow QmFor strong influence, the temperature T is related to the total mass flow QmFor weak influence, it is assumed that the temperature T is not considered first for the total mass flow QmThe flow rate multiplying factor and the mass liquid content are shown in the figure 7 by the flow calculation module.
The flow calculation module calculates the corrected total mass flow Q through a function curve and a curve equationm ’。
The flow calculation module is used for calculating the liquid content eta according to the massmAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql(ii) a Using the formula Qg=Ｑm ’*（1-ηm) Calculating the gas mass flow QgUsing the formula Ql=Ｑm ’*ηmCalculating the liquid mass flow Ql。
According to the wet gas flow measuring method provided by the embodiment of the invention, the total mass flow Q is measured by the Coriolis mass flow metermMixed density ρmixThe medium temperature T; the pressure difference delta P between the inlet and the outlet is measured by the sensor combination, and then the mixed density rho is combinedmixAcquiring the average pressure P in a measuring pipe of the Coriolis force mass flowmeter through a fluid mechanics calculation model CFD, performing multi-physical field coupling calculation through a flow calculation module, and calculating the pressure P at the corresponding position according to different positions X in the measuring pipe of the Coriolis force mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring tube of the Coriolis mass flowmeter in a mode of combining a function curve with a calculus area solution; and is calculated by mean pressure P combined with PVT equationCalculated average air density ρg(ii) a The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρlLiquid density ρlThe mass liquid content eta of the mixed medium is calculated by default as a constantmThrough mass liquid content ηmFor total mass flow QmCorrecting to obtain corrected total mass flow Qm ’Finally according to the total mass flow Qm ’And mass liquid content ηmCalculating the gas mass flow QgAnd liquid mass flow rate Ql。
Carrying out data measurement through a single Coriolis mass flowmeter, combining with multi-physical field coupling calculation, calculating to obtain accurate average pressure P, and further carrying out air density rhogCorrecting the air tightness rho according to the actual working conditiongCalculating to obtain accurate mass liquid content rate etamAnd the total mass flow Q according with the actual situationm ’And finally calculating to obtain the gas-liquid two-phase flow. The metering mode of the wet air flow and the data obtained by the device calculation have higher accuracy.
It is further noted here that the total mass flow Q in this embodimentmIs directly measured and calculated by a Coriolis mass flowmeter, and a person skilled in the art can also obtain the total mass flow Q through other devicesmFor example: a moisture meter based on resonance and differential pressure measurements can be used, first measuring the differential pressure Δ P between the inlet and outlet of the measurement tube by means of a sensor, using the formula: qm=A
Calculating to obtain the total mass flow QmWhere A is the system parameter and Δ P is the differential pressure between the inlet and outlet of the measuring tube, ρmixThe medium is mixed with the density.
Calculating to obtain the total mass flow QmAnd then, measuring and calculating subsequent data by adopting the same correction mode.
With reference to fig. 1 and 2, a coriolis-based wet gas flow measuring device includes a coriolis mass flow meter 1, a pipeline, a flow calculating module 5 and a sensor group, the sensor group is installed on the pipeline, the flow calculating module 5 includes a processing unit 4, wherein:
a duct for transporting moisture;
the sensor group is used for measuring differential pressure delta P at an inlet 6 and an outlet 7 in the pipeline;
the flow calculation module is used for performing multi-physical field coupling calculation, and calculating the pressure P of a corresponding position according to different positions X in the pipeline measured by the Coriolis mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a function curve; and calculating the average air density rho through the average pressure Pg(ii) a Then according to the mixed density rhomixAverage air density ρgLiquid tightness ρl(constant), calculating the mass liquid content rate eta of the mixed mediumm(ii) a From the mass liquid content of the mixed medium etamAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’(ii) a Finally according to the mass liquid content rate etamAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql。
Preferably, as shown in fig. 1-2, the sensor combination comprises a pressure sensor 3 and a differential pressure sensor 2, by measuring the pressure at the inlet 6 of the coriolis mass flowmeter 1 and measuring the differential pressure Δ P at the inlet 6 and outlet 7, in combination with the mixing density ρmixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
Preferably, as shown in fig. 3-4, the sensor combination comprises two pressure sensors 3, and the actual differential pressure Δ P is obtained by measuring the pressure at the inlet 6 and the outlet 7 of the coriolis mass flowmeter, in combination with the mixing density ρmixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
It should be noted that the above two sensor modes can achieve the purpose of measurement, and in the specific implementation process, the actual differential pressure Δ P can also be measured by other sensors in different combinations.
Preferably, the flow calculation module combines the PVT equation of the gas-phase medium according to the pressure and the temperature, and the gas state equation: PV = ε nRT, and the gas density ρgProportional to the pressure P and inversely proportional to the temperature T, it follows that the measurement of pressure and temperature is necessary and is a key quantity for obtaining the gas density, and assuming that, irrespective of the influence of the temperature field, when the pressure P varies, the volume V varies accordingly, using the formula:finally obtaining the average air density rhog。
Calculating air density ρgP, T are the pressure and absolute temperature, ρ, in the coriolis mass flowmeter, respectively, in the measurement tube0，P0And T0Respectively, air density, pressure and absolute temperature in a calibration state.
Preferably, the flow calculation module specifically uses a formula:
calculating the mass liquid content eta of the mixed mediumm，ρmixIs a mixture density, rhogIs mean air density, plIs the liquid density.
Preferably, the flow calculation module is used for calculating the liquid content eta according to the mass liquid content of the mixed mediummAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’The specific correction formula of the steps is as follows:
Ｑm ’＝ f（ P，T，ηm，Ｑm）；
in the actual calculation process, the data of a plurality of discrete point positions are measured through the flow calculation module, and the accurate data are obtained through generating a function curve through the data of a plurality of groups of discrete point positionsCalculating a function due to the mass liquid content eta in the actual processmFor total mass flow QmFor strong influence, the temperature T is related to the total mass flow QmFor weak influence, it is assumed that the temperature T is not considered first for the total mass flow QmThe flow rate multiplying factor and the mass liquid content shown in fig. 7 are obtained by the flow calculating module.
The flow calculation module calculates the corrected total mass flow Q through a function curve and a curve equationm ’。
Preferably, the flow calculation module specifically uses formula Qg=Ｑm ’*（1-ηm) Calculating the gas mass flow QgUsing the formula Ql=Ｑm ’*ηmCalculating the liquid mass flow Ql。
Preferably, a temperature sensor is arranged in the housing of the coriolis force mass flowmeter, the temperature sensor is attached to the measuring tube of the coriolis force flowmeter, and the temperature sensor synchronously vibrates with the measuring tube, so that the temperature of the reaction medium can be accurately measured.
According to the wet gas flow measuring device provided by the embodiment of the invention, the total mass flow Q is measured by the Coriolis mass flow metermMixed density ρmixThe medium temperature T; the pressure difference delta P between the inlet and the outlet is measured by the sensor combination, and then the mixed density rho is combinedmixAcquiring the average pressure P in a measuring pipe of the Coriolis force mass flowmeter through a fluid mechanics calculation model CFD, performing multi-physical field coupling calculation through a flow calculation module, and calculating the pressure P at the corresponding position according to different positions X in the measuring pipe of the Coriolis force mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring tube of the Coriolis mass flowmeter in a mode of combining a function curve with a calculus area solution; and calculating the average air density rho by combining the average pressure P with the PVT equationg(ii) a The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρlLiquid density ρlIs generally regarded as common by defaultCounting, calculating the mass liquid content eta of the mixed mediummThrough mass liquid content ηmFor total mass flow QmCorrecting to obtain corrected total mass flow Qm ’Finally according to the total mass flow Qm ’And mass liquid content ηmCalculating the gas mass flow QgAnd liquid mass flow rate Ql。
Carrying out data measurement through a single Coriolis mass flowmeter, and combining with multi-physical-field coupling calculation to carry out air density rhogCorrecting the air tightness rho according to the actual working conditiongCalculating to obtain accurate mass liquid content rate etamAnd the total mass flow Q according with the actual situationm ’And finally calculating to obtain the gas-liquid two-phase flow. The metering mode of the wet air flow and the data obtained by the device calculation have higher accuracy.
A series of experiments are carried out by using the wet gas flow metering device, and the experiments show that the mass liquid content eta ismFor total mass flow QmSee fig. 8, in particular, the mass liquid fraction η in the context of moisturemThe higher the effect on the total mass flow measurement measured by the coriolis mass flowmeter, the more the effect is, the substantially linear relationship.
To further prove the data measurement accuracy of the moisture measuring device of the present embodiment, fig. 9, 10 and 11 are flow data comparisons before and after correction.
According to the experimental data, the data which is not corrected has larger difference with the actual working condition data, and the difference between the corrected data and the actual working condition data is smaller, so that the validity of the multi-physical-field coupling correction is obvious.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (17)
1. A wet gas flow metering method based on a Coriolis mass flowmeter, comprising the steps of:
coriolis mass flowmeter for measuring mass flow Q in a pipemMixed density ρmixThe medium temperature T;
a sensor assembly for measuring pressure P at the inlet and outlet of the coriolis mass flowmeter;
the flow calculation module performs multi-physical field coupling calculation, calculates pressure P of a corresponding position according to different positions X in the measuring pipeline of the Coriolis mass flowmeter, and generates a function curve between the position and the pressure;
the flow calculation module calculates the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a function curve;
the flow calculation module calculates an average air density rho according to the average pressure Pg；
The flow calculation module is used for calculating the flow according to the mixed density rhomixAverage air density ρgLiquid tightness ρlCalculating the mass liquid content eta of the mixed mediumm；
The flow calculation module is used for calculating the liquid content eta according to the mass of the mixed mediummAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’；
The flow calculation module is used for calculating the liquid content eta according to the massmAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql。
2. The coriolis force mass flowmeter based wet gas flow metering method of claim 1, characterized in that said sensor combination comprises a pressure sensor and a differential pressure sensor, by measuring the pressure at the inlet of the coriolis force mass flowmeter and measuring the differential pressure Δ Ρ at the inlet and outlet in combination with the mixing density ρmixBy computational models of fluid mechanicsThe CFD obtains the average pressure within the coriolis mass flowmeter measurement tube.
3. The coriolis force mass flowmeter based wet gas flow metering method of claim 1, characterized in that said sensor set comprises two pressure sensors, and the actual differential pressure Δ Ρ is obtained by measuring the pressure at the inlet and outlet of the coriolis force mass flowmeter, in combination with the mixing density ρmixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
4. The coriolis force mass flowmeter based wet gas flow measurement method of claim 1, 2, or 3, wherein said step of said flow calculation module calculating an average pressure P in said coriolis force mass flowmeter measurement tube from said function curve comprises:
and calculating to obtain the average pressure P by using a calculus area solving mode.
5. The coriolis force mass flowmeter based wet gas flow measurement method of claim 4, wherein said flow calculation module calculates an average gas density ρ based on an average pressure PgComprises the following steps:
the pressure and temperature are combined with the PVT equation of a gas phase medium, and the formula is used:
Calculating air density ρgP, T are the pressure and absolute temperature, ρ, in the coriolis mass flowmeter, respectively, in the measurement tube0，P0And T0Respectively, air density, pressure and absolute temperature in a calibration state.
6. The coriolis force mass flowmeter based wet gas flow measurement method of claim 5, characterized in that said flow calculation module is based on a mixture density ρmixAverage air density ρgLiquid tightness ρlCalculating the mass liquid content eta of the mixed mediummComprises the following steps:
using the formula:
。
7. the coriolis force mass flowmeter based wet gas flow metering method of claim 6 characterized in that said flow calculation module is based on the mass liquid fraction η of the mixed mediamAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’The specific correction formula of the steps is as follows:
Ｑm ’＝ f（ P，T，ηm，Ｑm）。
8. the coriolis force mass flowmeter based wet gas flow measurement method of claim 7 wherein said flow calculation module is based on mass liquid fraction ηmAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate QlComprises the following steps:
using the formula Qg=Ｑm ’*（1-ηm) Calculating the gas mass flow Qg；
Using the formula Ql=Ｑm ’*ηmCalculating the liquid mass flow Ql。
9. The utility model provides a wet gas flowmeter metering device based on coriolis force mass flowmeter, includes coriolis force mass flowmeter, its characterized in that still includes pipeline, flow calculation module and sensor group, and sensor group installs on the pipeline, wherein:
a duct for transporting moisture;
the sensor group is used for measuring the differential pressure delta P between an inlet and an outlet in the pipeline;
the flow calculation module is used for performing multi-physical field coupling calculation, and calculating the pressure P of a corresponding position according to different positions X in the pipeline measured by the Coriolis mass flowmeter; generating a function curve between the position and the pressure; the flow calculation module calculates the average pressure P in the measuring pipe of the Coriolis mass flowmeter through a function curve; and calculating the average air density rho through the average pressure Pg(ii) a Then according to the mixed density rhomixAverage air density ρgLiquid tightness ρl(constant), calculating the mass liquid content rate eta of the mixed mediumm(ii) a From the mass liquid content of the mixed medium etamAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’(ii) a Finally according to the mass liquid content rate etamAnd total mass flow rate Qm ’Calculating the gas mass flow QgAnd liquid mass flow rate Ql。
10. The coriolis force mass flowmeter based wet gas flow metering device of claim 9, wherein said sensor combination comprises a pressure sensor and a differential pressure sensor, and said differential pressure sensor is configured to measure a pressure at an inlet of said coriolis force mass flowmeter and a differential pressure Δ Ρ at an inlet and an outlet in combination with a mixture density ρmixAnd obtaining the average pressure in the measuring pipe of the Coriolis mass flowmeter through a fluid mechanics calculation model CFD.
11. The coriolis force mass flowmeter based wet gas flow metering device of claim 9, wherein said sensor combination comprises two pressure sensors, and wherein said actual differential pressure Δ P is obtained by measuring pressure at an inlet and an outlet of said coriolis force mass flowmeter in combination with a mixture density ρmixCoriolis force mass flow meter obtained by a fluid mechanics calculation model CFDAverage pressure in the burette.
12. The coriolis force mass flowmeter based wet gas flow metering device of claim 9, 10, or 11, wherein said step of said flow calculation module calculating an average pressure P in said coriolis force mass flowmeter measurement tube from said function curve comprises: and calculating to obtain the average pressure P by using a calculus area solving mode.
13. The coriolis force mass flowmeter based wet gas flow metering device of claim 12 characterized in that the flow calculation module utilizes the formula based on pressure, temperature in combination with the PVT equation for the gas phase media:=
finally obtaining the average air density rhog；
Calculating air density ρgP, T are the pressure and absolute temperature, ρ, in the coriolis mass flowmeter, respectively, in the measurement tube0，P0And T0Respectively, air density, pressure and absolute temperature in a calibration state.
14. The coriolis force mass flowmeter based wet gas flow metering device of claim 13 characterized in that the flow calculation module utilizes the equation:
calculating the mass liquid content eta of the mixed mediumm，ρmixIs a mixture density, rhogIs mean air density, plIs the liquid density.
15. A coriolis based mass flow as defined in claim 14The wet gas flow measuring device of the meter is characterized in that the flow calculating module is used for calculating the liquid content eta of the mixed medium according to the massmAverage pressure P in the measuring tube and medium temperature T vs. total mass flow QmCorrecting to obtain the total mass flow Qm ’The specific correction formula is as follows:
Ｑm ’＝ f（ P，T，ηm，Ｑm）。
16. the coriolis force mass flowmeter based wet gas flow metering device of claim 15 characterized in that said flow calculation module utilizes in particular the formula Qg=Ｑm ’*（1-ηm) Calculating the gas mass flow QgUsing the formula Ql=Ｑm ’*ηmCalculating the liquid mass flow Ql。
17. A coriolis force mass flowmeter based wet gas flow metering device as set forth in claim 9, 10, or 11 in which said coriolis force mass flowmeter has a temperature sensor disposed within its housing, said temperature sensor being attached to a measurement tube of said coriolis force mass flowmeter.
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