CN110514257B - Venturi-based low liquid content moisture two-phase flow measuring device and method - Google Patents
Venturi-based low liquid content moisture two-phase flow measuring device and method 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
- G01F1/34—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 measuring pressure or differential pressure
- G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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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
- G01F1/34—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 measuring pressure or differential pressure
- G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
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Abstract
The invention discloses a venturi-based low liquid content moisture two-phase flow online measurement device and method, which comprises a data acquisition and processing system, a measurement pipeline, a venturi tube, a first differential pressure transmitter for detecting the moisture pressure difference between an upstream pressure taking point of a venturi throttling device and a throat pressure taking point of the venturi throttling device, a second differential pressure transmitter for detecting the moisture pressure loss between the upstream pressure taking point of the venturi throttling device and a downstream pressure taking point of the venturi throttling device, a pressure transmitter for detecting the moisture pressure in the measurement pipeline and a temperature transmitter for detecting the temperature of the moisture in the measurement pipeline, wherein the measurement pipeline is communicated with a pipeline to be measured.
Description
Technical Field
The invention belongs to the technical field of moisture parameter measurement, and relates to a venturi-based low liquid content moisture two-phase flow online measurement device and method.
Background
The moisture can be regarded as a gas-liquid mixture mixed with a small amount of liquid phase in the gas phase, and widely exists in the fields of petroleum, chemical industry, geothermal energy, nuclear energy and the like, and mainly comprises wet saturated steam and wet natural gas. Currently, the widely used moisture definition in the world is a two-phase gas-liquid flow with a Loma parameter of less than 0.3. Because the daily gas production of most natural gas wells in China is low, the development of a low-cost online gas-liquid two-phase flow measurement technology is particularly important for mastering single-well data, scientifically managing gas reservoirs, predicting the water yield of gas wells and the like.
At present, the method for measuring the gas-liquid two-phase flow on line mainly comprises a separation method and an on-line measurement method, the traditional separation method is to separately measure the separated gas phase and liquid phase, generally, the separation equipment has large volume, wastes time and labor and has low efficiency, and for moisture with low liquid content, the separator can have incomplete separation phenomenon and can not accurately reflect the liquid phase flow. The on-line measurement method can directly measure the gas-liquid flow without gas-liquid separation, and most of the current moisture double-parameter on-line measurement methods still adopt two types of differential pressure throttling devices combined with a phase content sensor or two types of differential pressure throttling devices combined. Some commercialized moisture flow meters, such as the moisture flow meter developed by the Haimei company in China, use monoenergetic gamma rays to measure the liquid content, and obtain the gas-liquid phase separation flow rate by combining with a Venturi moisture measurement model; foreign countries such as Emerson Roxar wet gas flowmeter, adopt the microwave technology to measure the liquid phase content, V awl measures the two-phase total volume flow of gas-liquid; the above flow meters are all used for on-line measurement of moisture two-phase flow by adopting a differential pressure device and a phase content sensor. Although the existing flowmeter can perform high-precision gas-liquid flow double-parameter measurement, the general problems are that the price is high and the maintenance is difficult.
The domestic scholars are working on developing low-cost wet gas double-parameter online measuring devices with independent intellectual property rights, and currently, the gas-liquid flow can be measured online by using a single throttling device, but in the research process, the relative error of the wet gas-liquid phase mass flow under the working condition of low liquid content (the Loma parameter is below 0.02) is generally higher (more than 100%).
Disclosure of Invention
Aiming at the problem that the relative error of the mass flow rate of the moisture liquid phase is generally high under the working condition of low liquid content in the prior art, the invention provides the device and the method for measuring the two-phase flow rate of the moisture liquid phase based on the low liquid content of the Venturi, so that the online measurement of the gas-liquid flow rate of the moisture liquid with low liquid content is realized, the cost is low, the precision is high, and the structure is simple.
The invention is realized by the following technical scheme:
a venturi-based low liquid content moisture two-phase flow online measurement method comprises the following steps:
s1, mounting a venturi tube on the measuring pipeline to perform a low liquid content wet gas flow measuring experiment;
collecting moisture pressure difference delta P between upstream pressure point and throat pressure point of Venturi tube1Moisture pressure loss Δ P between upstream and downstream pressure taking points2The pressure P of the moisture flowing through the venturi, the temperature T of the moisture, and the mass flow m through the gas and liquid phases are recordedgAnd ml；
S2, calculating the density rho of the gas phase and the liquid phase according to the moisture pressure P and the moisture temperature TgAnd ρlObtaining the apparent total mass flow m of the two phases of the wet gas according to the Bernoulli equation and the continuity equationapparent；
S3, defining a two-phase mass flow coefficient K, and obtaining the gas-phase mass flow m according to the step S1gMass flow m of liquid phaselMoisture, moistureDifferential pressure Δ P1Moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlApparent total mass flow m of two phases of wet gasapparentEstablishing two-phase mass flow coefficients K and Frg、FrlAnd ρg/ρlThe relation between;
wherein Frg、FrlGas and liquid phase density froude numbers, respectively;
s4, obtaining the mass flow m of the liquid phase according to the step S1lDifferential pressure of moisture Δ P1And moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlEstablishing a liquid phase density Froude number FrlPressure loss ratio and gas-liquid density ratio rhog/ρlA correlation between;
s5, according to the two-phase mass flow coefficient K and the two-phase apparent total mass flow mapparentConstructing a calculation model of gas phase mass flow;
s6, collecting the moisture pressure difference delta P when the moisture to be measured passes through the Venturi tube1Moisture pressure loss Δ P2Moisture pressure P and moisture temperature T, and calculating to obtain the pressure loss ratio of the moisture to be measured and the gas phase density rho of the moisture to be measuredgAnd liquid phase density ρl；
S7, comparing the moisture pressure loss ratio and the gas phase density rho obtained in the step S6gAnd liquid phase density ρlSubstituting into the liquid-phase density Froude number Fr obtained in step S4lIn the correlation of (1), the mass flow m of the liquid phase of the moisture to be measured is obtainedl；
S8, comparing the moisture pressure difference DeltaP obtained in the step S61Gas phase density ρgAnd liquid phase density ρlThe two-phase mass flow coefficients K and Fr obtained in step S3g、FrlAnd ρg/ρlThe relationship between the two and the liquid phase density Froude number Fr obtained in step S4lPressure loss ratio and gas-liquid density ratio rhog/ρlSubstituting the correlation equation into the gas-phase mass flow calculation model obtained in the step S5 to obtain a gas-phase mass flow calculation equation;
s9, carrying out iterative solution on the calculation formula of the gas phase mass flow obtained in the step S8, and when the value is delta mgWhen the mass flow is less than 0.1 percent, the iteration is completed to obtain the gas phase mass flow mg。
Preferably, the wet gas two-phase apparent total mass flow m in step S2apparentThe expression (c) is specifically as follows:
At＝πd2/4
A＝πD2/4
wherein β is the throttle ratio of the Venturi throttle device, defined as the ratio of the cross-sectional area of the Venturi device throat to the cross-sectional area of the measuring pipe, AtThe cross section area of the throat part of the Venturi throttling device is shown, A is the cross section area of a measuring pipeline, D is the diameter of the measuring pipeline, and D is the diameter of the throat part of the Venturi; e is the form factor of the Venturi throttle.
Preferably, the two-phase mass flow coefficients K and Fr in step S3g、FrlAnd ρg/ρlThe relationship between the following is specified:
K＝aFrl+b
a＝f(Frg,ρg/ρl)
b＝f(Frg,ρg/ρl)
wherein FrgAnd FrlDensity Froude number, m, of gas and liquid phases respectivelylMass of liquid phase, mgGas phase mass, a is slope and b is intercept.
Preferably, the liquid-phase density Froude number Fr in step S4lPressure loss ratio and gas-liquid density ratio rhog/ρlThe correlation between the following:
Frl＝f(,ρg/ρl)
wherein, ═ Δ P2/ΔP1。
Preferably, the calculation model of the gas phase mass flow in step S5 is as follows:
preferably, step S7 obtains the liquid phase mass flow m of the moisture to be measuredlThe formula of (1) is as follows:
preferably, the calculation formula of the gas phase mass flow obtained in step S8 is as follows:
mg＝f(mapparent,Frg,,ρg/ρl)
the invention also provides a measuring device of the online measuring method of the low liquid content moisture two-phase flow based on the Venturi, which is characterized by comprising a Venturi throttling device, a pressure transmitter, a first differential pressure transmitter, a second differential pressure transmitter and a temperature transmitter which are arranged on a measuring pipeline;
the pressure transmitter, the first differential pressure transmitter, the second differential pressure transmitter and the temperature transmitter are respectively connected with the data acquisition and processing system;
the first differential pressure transmitter is used for measuring the differential pressure before moisture between the upstream pressure taking point and the throat pressure taking point of the Venturi throttling device;
the second differential pressure transmitter is used for measuring the total pressure loss of moisture between an upstream pressure taking point and a downstream pressure taking point of the Venturi throttling device;
the pressure transmitter is used for detecting the moisture pressure in the measuring pipeline;
the temperature transmitter is used for detecting the temperature of moisture in the measuring pipeline;
the data acquisition and processing system is used for receiving the data acquired by the pressure transmitter, the first differential pressure transmitter, the second differential pressure transmitter and the temperature transmitter and outputting the gas phase mass flow m in the measuring pipeline according to the received datagAnd mass flow m of liquid phasel。
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a venturi throttling device-based on-line measurement of low liquid content moisture two-phase flow, which comprises the steps of firstly carrying out simulation experiment, collecting pressure parameters and gas-liquid phase mass flow parameters in the experiment process, establishing the relation between measurement parameters and gas-liquid flow according to the collected experiment parameters and theoretical analysis, and constructing a gas-liquid phase flow measurement model; during detection, collecting parameters of moisture to be measured when the moisture passes through the Venturi tube, and substituting the parameters into the establishment of a measurement model to obtain the mass flow of the gas phase and the liquid phase of the moisture to be measured; the online measurement of the mass flow of the gas phase and the liquid phase in the moisture is realized under the condition of low liquid content, and the model measurement precision is higher, the cost is lower and the efficiency is high.
The venturi tube, the pressure transmitter, the differential pressure transmitter and the temperature transmitter are arranged on the measuring pipeline, and further, for the temperature, the pressure and the differential pressure parameters in the measuring pipeline, the mass flow of the gas phase and the liquid phase in the moisture can be obtained by acquiring the acquired parameters through the data acquisition processing system 7.
Drawings
FIG. 1 is a schematic view of a measuring device according to the present invention;
FIG. 2 is a data processing flow chart of the measurement method of the present invention;
FIG. 3 is a gas phase mass flow error analysis chart of the present invention;
FIG. 4 is a diagram of an error analysis of the mass flow of the liquid phase according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1, a venturi-based low liquid content two-phase moisture flow measuring device comprises a venturi throttling device 1, a measuring pipeline 2, a pressure transmitter 3, a first differential pressure transmitter 4, a second differential pressure transmitter 5, a temperature transmitter 6 and a data acquisition and processing system 7.
And the first differential pressure transmitter 4 is used for measuring the pressure difference before moisture between the upstream pressure taking point and the throat pressure taking point of the Venturi throttling device 1.
And the second differential pressure transmitter 5 is used for measuring the total pressure loss of moisture between the upstream pressure taking point and the downstream pressure taking point of the Venturi throttling device 1.
A pressure transmitter 3 for detecting the moisture pressure in the measuring pipe 2.
And a temperature transmitter 6 for detecting the temperature of the moisture in the measuring pipe 2.
The data acquisition and processing system 7 is used for receiving the data acquired by the pressure transmitter 3, the first differential pressure transmitter 4, the second differential pressure transmitter 5 and the temperature transmitter 6 and outputting the gas phase mass flow m in the measuring pipeline according to the received datagAnd mass flow m of liquid phasel。
Referring again to fig. 1, the venturi throttling device 1 is installed on the measuring pipe 2, the pressure transmitter 3 is installed on the upstream of the venturi throttling device 1, the first differential pressure transmitter 4 is installed on the throat portion of the venturi throttling device 1, and the second differential pressure transmitter 5 and the temperature transmitter 6 are installed on the downstream of the venturi throttling device 1;
the data acquisition and processing system 7 is respectively connected with the pressure transmitter 3, the first differential pressure transmitter 4, the second differential pressure transmitter 5 and the temperature transmitter 6.
Referring to fig. 2, the invention also provides an online measuring method of the low liquid content moisture two-phase flow based on the venturi throttling device, which comprises the following steps:
s1, carrying out low liquid content moisture flow measurement experiment, connecting the measurement device on a two-phase flow experiment pipeline through a flange, introducing a certain amount of gas phase and liquid phase, wherein the mass flow is m respectivelyg，ml(ii) a Collecting moisture pressure difference delta P between upstream pressure taking point and throat pressure taking point of Venturi throttling device1Moisture pressure loss Δ P between upstream and downstream pressure taking points2The moisture pressure P and the moisture temperature T flowing through the venturi.
S2, calculating the density rho of the gas phase and the liquid phase according to the moisture pressure P and the moisture temperature TgAnd ρlThe apparent total mass flow m of the two phases of the moisture can be obtained according to the derivation of Bernoulli equation and continuity equationapparent。
At＝πd2/4
A＝πD2/4
Wherein β is the throttle ratio of the Venturi throttle device, defined as the ratio of the cross-sectional area of the Venturi device throat to the cross-sectional area of the measuring pipe, AtThe cross section area of the throat part of the Venturi throttling device is shown, A is the cross section area of a measuring pipeline, D is the diameter of the measuring pipeline, and D is the diameter of the throat part of the Venturi; e is the form factor of the Venturi throttle.
S3, defining two-phase mass flow coefficient K ═ mg+ml)/mapparentGas phase mass flow m obtained according to step S1gMass flow m of liquid phaselDifferential pressure of moisture Δ P1Moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlApparent total mass flow m of two phases of wet gasapparentEstablishing two-phase mass flow coefficients K and Frg、FrlAnd ρg/ρlThe relation between;
K＝aFrl+b
a＝f(Frg,ρg/ρl)
b＝f(Frg,ρg/ρl)
wherein FrgAnd FrlDensity Froude number, m, of gas and liquid phases respectivelylMass of liquid phase, mgGas phase mass, a is slope and b is intercept.
S4, obtaining the mass flow m of the liquid phase according to the step S1lDifferential pressure of moisture Δ P1And moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlEstablishing a liquid phase density Froude number FrlPressure loss ratio and gas-liquid density ratio rhog/ρlThe correlation therebetween.
Frl＝f(,ρg/ρl)
Wherein, ═ Δ P2/ΔP1。
S5, according to the two-phase mass flow coefficient K and the two-phase apparent total mass flow mapparentConstructing a calculation model of gas phase mass flow, wherein the formula is as follows;
s6, collecting the moisture pressure difference delta P when the moisture to be measured passes through the Venturi tube1Moisture pressure loss Δ P2Moisture pressure P and moisture temperature T;
s7, moisture pressure difference delta P obtained according to the step S61And moisture pressure loss Δ P2Calculating the pressure loss ratio of the moisture to be measured, and calculating the gas phase density rho in the moisture to be measured according to the moisture pressure P and the moisture temperature T obtained in the step S6gAnd liquid phase density ρl。
S8, comparing the moisture pressure loss ratio and the gas phase density rho obtained in the step S7gAnd liquid phase density ρlSubstituting into the liquid-phase density Froude number Fr obtained in step S4lIn the calculation correlation of (a), the mass flow m of the liquid phase of the moisture to be measured is obtainedl。
S9, and comparing the moisture pressure difference delta P obtained in the step S6 and the step S71Gas phase density ρgAnd liquid phase density ρlThe two-phase mass flow coefficients K and Fr obtained in step S3g、FrlAnd ρg/ρlThe relationship between the two and the liquid phase density Froude number Fr obtained in step S4lPressure loss ratio and gas-liquid density ratio rhog/ρlSubstituting the correlation between the values into the gas-phase mass flow calculation model obtained in step S5 to obtain a gas-phase mass flow calculation formula:
mg＝f(mapparent,Frg,,ρg/ρl)
s10, carrying out iterative solution on the calculation formula of the gas phase mass flow obtained in the step S8, and when the value is delta mgWhen the mass flow is less than 0.1 percent, the iteration is completed to obtain the gas phase mass flow mg。
Example 1
Whole measuring device passes through flange joint on the pipeline that needs the measurement, measuring tube 2's internal diameter is 50mm, 1 throat length of venturi throttling arrangement equals its throat diameter D, the upper reaches are got the pressure point and are located 1 contraction section entry upper reaches D/2 distance department of venturi throttling arrangement, the lower reaches are got the pressure point and are located 1 expansion section export lower reaches 6-D distance department of venturi throttling arrangement, the throttle ratio of venturi throttling arrangement 1 is 0.45, experimental pressure P equals 0.1 ~ 0.3MPa, gaseous phase apparent velocity14.3-30.3 m/s, liquid phase apparent velocity 0-0.016 m/s, and Loma parameter X LM0 to 0.02% and 0 to 0.113% of a volume liquid fraction LVF,
wherein Q isg，QlThe volumetric flow rates of the gas and liquid phases, respectively.
Two-phase mass flow coefficients K and Fr in this exampleg、FrlAnd ρg/ρlThe relationship between them is as follows; k ═ exp (1.0696-0.4237ln (ρ)g/ρl)-1.1567Frg)Frl+0.7847+30.7658(ρg/ρl)-0.0666Frg
Liquid phase Density Froude number Fr in this examplelPressure loss ratio and gas-liquid density ratio rhog/ρlThe correlation between them is as follows;
in this example, the liquid phase mass flow calculation formula mlThe following were used:
in this example, the calculation formula m for the gas phase mass flowg＝f(mapparent,Frg,,ρg/ρl) Iteration is carried out when Δ mgWhen the mass flow is less than 0.1 percent, the iteration is completed, and the gas phase mass flow m can be obtainedg。
As shown in fig. 3 and 4, the gas phase and liquid phase flow error analysis chart measured by the venturi throttling device flowmeter by using the method of the invention shows that the relative error of the gas phase flow is less than +/-2.5%; under the condition of a confidence level of 95%, the liquid phase error is +/-15%, and the requirements of industrial fields can be met.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (4)
1. A low liquid content moisture two-phase flow online measurement method based on Venturi is characterized by comprising the following steps:
s1, mounting a venturi tube on the measuring pipeline to perform a low liquid content wet gas flow measuring experiment;
collecting moisture pressure difference delta P between upstream pressure point and throat pressure point of Venturi tube1Moisture pressure loss Δ P between upstream and downstream pressure taking points2The pressure P of the moisture flowing through the venturi, the temperature T of the moisture, and the mass flow m through the gas and liquid phases are recordedgAnd ml；
S2, calculating the density rho of the gas phase and the liquid phase according to the moisture pressure P and the moisture temperature TgAnd ρlObtaining the apparent total mass flow m of the two phases of the wet gas according to the Bernoulli equation and the continuity equationapparent；
S3, defining a two-phase mass flow coefficient K, and obtaining the gas-phase mass flow m according to the step S1gMass flow m of liquid phaselDifferential pressure of moisture Δ P1Moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlApparent total mass flow m of two phases of wet gasapparentEstablishing two-phase mass flow coefficients K and Frg、FrlAnd ρg/ρlThe relationship between the following:
K＝aFrl+b
a＝f(Frg,ρg/ρl)
b＝f(Frg,ρg/ρl)
wherein FrgAnd FrlDensity Froude number, m, of gas and liquid phases respectivelylMass of liquid phase, mgGas phase mass, a is slope, b is intercept;
s4, obtaining the mass flow m of the liquid phase according to the step S1lDifferential pressure of moisture Δ P1And moisture pressure loss Δ P2And the densities ρ of the gas phase and the liquid phase obtained in step S2gAnd ρlEstablishing a liquid phase density Froude number FrlPressure loss ratio and gas-liquid density ratio rhog/ρlThe correlation between the following:
Frl＝f(,ρg/ρl)
wherein, ═ Δ P2/ΔP1；
S5, according to the two-phase mass flow coefficient K and the two-phase apparent total mass flow mapparentConstructing a calculation model of gas phase mass flow;
s6, collecting the moisture pressure difference delta P when the moisture to be measured passes through the Venturi tube1Moisture pressure loss Δ P2Moisture pressure P and moisture temperature T, and calculating to obtain the pressure loss ratio of the moisture to be measured and the gas phase density rho of the moisture to be measuredgAnd liquid phase density ρl；
S7, comparing the moisture pressure loss ratio and the gas phase density rho obtained in the step S6gAnd liquid phase density ρlSubstituting into the liquid-phase density Froude number Fr obtained in step S4lIn the correlation of (1), the mass flow m of the liquid phase of the moisture to be measured is obtainedlMass flow of liquid phase mlThe formula of (1) is as follows:
s8, the moisture obtained in the step S6Differential pressure Δ P1Gas phase density ρgAnd liquid phase density ρlThe two-phase mass flow coefficients K and Fr obtained in step S3g、FrlAnd ρg/ρlThe relationship between the two and the liquid phase density Froude number Fr obtained in step S4lPressure loss ratio and gas-liquid density ratio rhog/ρlThe correlation between the gas phase mass flow and the gas phase mass flow is substituted into the gas phase mass flow calculation model obtained in step S5 to obtain a gas phase mass flow calculation formula, which is as follows:
mg＝f(mapparent,Frg,,ρg/ρl)
s9, carrying out iterative solution on the calculation formula of the gas phase mass flow obtained in the step S8, and when the value is delta mgWhen the mass flow is less than 0.1 percent, the iteration is completed to obtain the gas phase mass flow mg。
2. The venturi-based low liquid content two-phase flow online measurement method according to claim 1, wherein the wet two-phase apparent total mass flow m in step S2apparentThe expression (c) is specifically as follows:
At＝πd2/4
A＝πD2/4
wherein β is the throttle ratio of the Venturi throttle device, defined as the ratio of the cross-sectional area of the Venturi device throat to the cross-sectional area of the measuring pipe, AtThe cross section area of the throat part of the Venturi throttling device is shown, A is the cross section area of a measuring pipeline, D is the diameter of the measuring pipeline, and D is the diameter of the throat part of the Venturi; e is VenturiThe form factor of the restriction device.
3. The venturi-based low liquid content two-phase flow online measurement method of moisture vapor according to claim 1, wherein the calculation model of the gas phase mass flow in step S5 is as follows:
4. a measuring device adopting the venturi-based low liquid content two-phase flow rate on-line measuring method of any one of claims 1 to 3, characterized by comprising a venturi throttling device (1), a pressure transmitter (3), a first differential pressure transmitter (4), a second differential pressure transmitter (5) and a temperature transmitter (6) which are arranged on a measuring pipeline 2;
the pressure transmitter (3), the first differential pressure transmitter (4), the second differential pressure transmitter (5) and the temperature transmitter (6) are respectively connected with the data acquisition and processing system (7);
a first differential pressure transmitter (4) for measuring the differential pressure before moisture between the upstream pressure taking point and the throat pressure taking point of the venturi throttle device (1);
the second differential pressure transmitter (5) is used for measuring the total pressure loss of moisture between the upstream pressure taking point and the downstream pressure taking point of the Venturi throttling device (1);
a pressure transmitter (3) for detecting the moisture pressure inside the measuring pipe (2);
a temperature transmitter (6) for detecting the temperature of the moisture in the measuring pipe (2);
the data acquisition and processing system (7) is used for receiving the data acquired by the pressure transmitter (3), the first differential pressure transmitter (4), the second differential pressure transmitter (5) and the temperature transmitter (6) and outputting the gas phase mass flow m in the measuring pipeline according to the received datagAnd mass flow m of liquid phasel。
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| US20150199544A1 (en) * | 2014-01-16 | 2015-07-16 | King Fahd University Of Petroleum And Minerals | Modified beggs & brill multiphase flow correlation with fuzzy logic flow regime prediction |
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| CN107843297B (en) * | 2017-10-17 | 2019-12-24 | 西安交通大学 | Low-gas-content gas-liquid two-phase flow liquid phase flow online measuring device and method based on V cone |
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