CN110514257A - A kind of low liquid holdup moisture two-phase flowmeter device and method based on venturi - Google Patents
A kind of low liquid holdup moisture two-phase flowmeter device and method based on venturi Download PDFInfo
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- CN110514257A CN110514257A CN201910820627.4A CN201910820627A CN110514257A CN 110514257 A CN110514257 A CN 110514257A CN 201910820627 A CN201910820627 A CN 201910820627A CN 110514257 A CN110514257 A CN 110514257A
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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
Abstract
The invention discloses a kind of low liquid holdup moisture two phase flow on-line measurement device and method based on venturi, including data acquisition processing system, measure pipeline, Venturi tube, for detecting first differential pressure transmitter of the moisture pressure difference between venturi throttling set upstream pressure point and venturi throttling set throat pressure point, for detecting second differential pressure transmitter of moisture crushing between venturi throttling set upstream pressure point and venturi throttling set downstream pressure point, for detect measurement pipeline in moisture stress pressure transmitter and for detect measure pipeline in moisture temperature temperature transmitter, the measurement pipeline is connected on pipeline to be measured, the device and method can be realized the on-line measurement of the gas-liquid two-phase flow of moisture under the conditions of low liquid holdup, and cost is relatively low, structure is simple.
Description
Technical field
The invention belongs to moisture parameter measuring technical fields, are related to a kind of low liquid holdup moisture two phase flow based on venturi
Measure on-line measurement device and method.
Background technique
Moisture can be considered the gas-liquid mixture that a small amount of liquid phase is mixed into gas phase, be widely present in petroleum, chemical industry, underground heat, core
The fields such as energy mainly include wet saturated steam and wet gas.Currently, the moisture definition being widely used in the world is Lip river Ma parameter
Biphase gas and liquid flow less than 0.3.Since the daily output tolerance of China's major part natural gas well is lower, the on-line measurement of developing low-cost
Gas-liquid two-phase flow measurement technology, for grasping individual well data, scientific management gas reservoir, prediction Gas well dewatering amount etc. seems especially heavy
It wants.
Mainly there are partition method and two kinds of on-line measurement method for the method for gas-liquid two-phase flow on-line measurement at present, it is traditional
Partition method is that will individually measure after gas phase and liquid phase separation, and it is huge to be generally separated equipment volume, time-consuming and laborious, low efficiency
Under, and for the moisture of low liquid holdup, separator can not accurately reflect liquid phase there may be incomplete phenomenon is separated
Flow.On-line measurement method can directly measure gas-liquid flow, current most of moistures are two-parameter online without carrying out gas-liquid separation
Measurement method is still that differential pressure throttle device combination phase content sensor or two kinds of differential pressure throttle devices combine two classes.It is some
Commercialized wet gas meter, the domestic wet gas meter developed such as Hai Mo company use monoenergetic gamma rays to measure liquid holdup, knot
It closes venturi wet gas measurement model and obtains gas-liquid separate phase flow rate；External such as Ai Mosheng Roxar wet gas meter, using microwave technology
Measure liquid phase phase content, V cone measurement gas-liquid two-phase total volumetric flow rate；The venturi combination EMR electromagnetic resonance of ISA company, Britain exploitation
Cavity sensor etc. is the online survey that moisture two phase flow is carried out using differential pressure device combination phase content sensor with flow meter
Amount.Although current existing flowmeter can carry out high-precision gas-liquid flow two-parameter measurement, general problem is that price
Valuableness, it is difficult in maintenance.
Domestic scholars are committed to developing the two-parameter on-line measurement device of inexpensive moisture with independent intellectual property rights, mesh
Before be able to use single throttling set and carry out the on-line measurement of gas-liquid flow, but find in the course of the study, under low liquid holdup operating condition
The moisture liquid phase quality flow relative error of (Lip river Ma parameter is below 0.02) is generally higher (100% or more).
Summary of the invention
For the universal higher problem of moisture liquid phase quality flow relative error under low liquid holdup operating condition in the prior art, this
Invention provides a kind of low liquid holdup moisture two-phase flowmeter device and method based on venturi, realizes low liquid holdup moisture
Gas-liquid flow on-line measurement, and cost is relatively low, and precision is higher, and structure is simple.
The present invention is to be achieved through the following technical solutions:
A kind of low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, comprising the following steps:
S1, installation Venturi tube carries out low liquid holdup flux of moisture measurement experiment on measurement pipeline；
Acquire the moisture pressure differential deltap P between Venturi tube upstream pressure point and throat's pressure point1, upstream pressure point and downstream
Moisture crushing Δ P between pressure point2, flow through moisture stress P, the moisture temperature T of Venturi tube, and record by gas phase and
The mass flow m of liquid phasegAnd ml；
S2, the density p that gas phase and liquid phase are calculated according to moisture stress P and moisture temperature TgAnd ρl, according to Bernoulli Jacob side
Journey and continuity equation obtain the apparent total mass flow rate m of moisture two-phaseapparent；
S3, two-phase mass flow coefficient K, the gas phase mass flow m obtained according to step S1 are definedg, liquid phase quality flow
ml, moisture pressure differential deltap P1, moisture crushing Δ P2And the density p of gas phase and liquid phase that step S2 is obtainedgAnd ρl, moisture two-phase table
See total mass flow rate mapparent, establish two-phase mass flow coefficient K and Frg、FrlAnd ρg/ρlBetween relational expression；
Wherein, Frg、FrlGas phase and density of liquid phase Froude number respectively；
S4, the liquid phase quality flow m obtained according to step S1l, moisture pressure differential deltap P1With moisture crushing Δ P2And step
The density p of gas phase and liquid phase that S2 is obtainedgAnd ρl, establish density of liquid phase Froude number FrlWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/
ρlBetween correlation；
S5, according to two-phase mass flow coefficient K and the apparent total mass flow rate m of two-phaseapparent, construct gas phase mass flow
Computation model；
S6, moisture pressure differential deltap P when acquisition moisture to be measured passes through Venturi tube1, moisture crushing Δ P2, moisture stress P and
Moisture temperature T, and the density of gas phase ρ of moisture Pressure Loss Ratio δ to be measured and moisture to be measured is calculatedgWith density of liquid phase ρl；
S7, moisture Pressure Loss Ratio δ, the density of gas phase ρ for obtaining step S6gWith density of liquid phase ρl, substitute into the liquid that step S4 is obtained
Phase density Froude number FrlCorrelation in, obtain the liquid phase quality flow m of moisture to be measuredl；
S8, the moisture pressure differential deltap P for obtaining step S61, density of gas phase ρgWith density of liquid phase ρl, the obtained two-phase of step S3
Mass flow coefficient K and Frg、FrlAnd ρg/ρlBetween the obtained density of liquid phase Froude number Fr of relational expression and step S4lWith
Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlBetween correlation, substitute into the computation model of gas phase mass flow that step S5 is obtained,
Obtain the calculating formula of gas phase mass flow；
S9, solution is iterated to the calculating formula of the obtained gas phase mass flow of step S8, as Δ mgWhen < 0.1%, repeatedly
In generation, completes, and obtains gas phase mass flow mg。
Preferably, the apparent total mass flow rate m of moisture two-phase in step S2apparentExpression formula it is specific as follows:
At=π d2/4
A=π D2/4
Wherein, β is the Throttling ratio of venturi throttling set, is defined as Venturi throat cross-sectional area and measurement pipeline
The ratio of sectional area, AtFor venturi throttling set throat cross-sectional area, A is measurement pipeline cross-sectional area, and D is measurement pipeline
Diameter, d are venturi throat diameter；E is the form factor of venturi throttling set.
Preferably, two-phase mass flow coefficient K and Fr in step S3g、FrlAnd ρg/ρlBetween relational expression it is specific as follows:
K=aFrl+b
A=f (Frg,ρg/ρl)
B=f (Frg,ρg/ρl)
Wherein, FrgAnd FrlGas phase and density of liquid phase Froude number respectively, mlLiquid phase quality, mgGas phase quality, a are slope,
B is intercept.
Preferably, density of liquid phase Froude number Fr in step S4lWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlBetween association
Formula is as follows:
Frl=f (δ, ρg/ρl)
Wherein, δ=Δ P2/ΔP1。
Preferably, the computation model of gas phase mass flow is as follows in step S5:
Preferably, step S7 obtains the liquid phase quality flow m of moisture to be measuredlFormula it is as follows:
Preferably, the calculating formula for the gas phase mass flow that step S8 is obtained is as follows:
mg=f (mapparent,Frg,δ,ρg/ρl)
The measurement for the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi that the present invention also provides a kind of
Device, which is characterized in that including venturi throttling set, the pressure transmitter, the first differential pressure transporting being mounted on measurement pipeline
Device, the second differential pressure transmitter and temperature transmitter；
Pressure transmitter, the first differential pressure transmitter, the second differential pressure transmitter and temperature transmitter are respectively and at data acquisition
The connection of reason system；
First differential pressure transmitter is wet between venturi throttling set upstream pressure point and throat's pressure point for measuring
Pressure difference before gas；
Second differential pressure transmitter, it is total for measuring moisture between venturi throttling set upstream pressure point and downstream pressure point
Crushing；
Pressure transmitter, for detecting the moisture stress in measurement pipeline；
Temperature transmitter, for detecting the moisture temperature in measurement pipeline；
Data acquisition processing system, for receiving pressure transmitter, the first differential pressure transmitter, the second differential pressure transmitter and temperature
The data of transmitter acquisition are spent, and the gas phase mass flow m in data output measurement pipeline based on the receivedgWith liquid phase quality stream
Measure ml。
Compared with prior art, the invention has the following beneficial technical effects:
The low liquid holdup moisture two phase flow on-line measurement based on venturi throttling set provided by the invention, it is first
Simulated experiment is first carried out, the mass flow parameter of the pressure parameter and gas phase and liquid phase in experimentation is acquired, according to acquisition
Experiment parameter and theory analysis establish the relationship between measurement parameter and gas-liquid flow, construct gas phase and liquid phase flow measurement mould
Type；When being detected, parameter when moisture to be measured passes through Venturi tube will be acquired, substitution is established in measurement model, can be obtained
To the gas phase and liquid phase quality flow of moisture to be measured；Realize under the conditions of low liquid holdup gas phase and liquid phase quality flow in moisture
On-line measurement, and model measurement precision is higher, cost is relatively low and high-efficient.
Low liquid holdup moisture two-phase flowmeter device provided by the invention based on venturi is installed on measurement pipeline
Venturi tube and pressure transmitter, differential pressure transmitter and temperature transmitter, and then to temperature, pressure and the differential pressure in measurement pipeline
Gas phase and liquid phase quality flow, the device in moisture can be obtained by data acquisition processing system 7 in the parameter of acquisition by parameter
Structure detection, measurement are convenient and low in cost.
Detailed description of the invention
Fig. 1 is measuring device structural schematic diagram of the present invention；
Fig. 2 is the flow chart of data processing figure of measurement method of the present invention；
Fig. 3 is gas phase mass flow error analysis figure of the present invention；
Fig. 4 is liquid phase quality flow error analysis chart of the present invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, described to be explanation of the invention rather than limit
It is fixed.
With reference to Fig. 1, a kind of low liquid holdup moisture two-phase flowmeter device based on venturi, including venturi throttling dress
1, measurement pipeline 2, pressure transmitter 3, the first differential pressure transmitter 4, the second differential pressure transmitter 5, temperature transmitter 6 and data are set to adopt
Collect processing system 7.
First differential pressure transmitter 4 is wet between 1 upstream pressure point of venturi throttling set and throat's pressure point for measuring
Pressure difference before gas.
Second differential pressure transmitter 5, for measuring moisture between 1 upstream pressure point of venturi throttling set and downstream pressure point
Total crushing.
Pressure transmitter 3, for detecting the moisture stress in measurement pipeline 2.
Temperature transmitter 6, for detecting the moisture temperature in measurement pipeline 2.
Data acquisition processing system 7, for receiving pressure transmitter 3, the first differential pressure transmitter 4, the second differential pressure transmitter 5
The data acquired with temperature transmitter 6, and the gas phase mass flow m in data output measurement pipeline based on the receivedgAnd liquid phase
Mass flow ml。
Referring again to Fig. 1, venturi throttling set 1 is mounted on measurement pipeline 2, and pressure transmitter 3 is mounted on venturi
The upstream of throttling set 1, the first differential pressure transmitter 4 are mounted on the throat of venturi throttling set 1,5 He of the second differential pressure transmitter
Temperature transmitter 6 is mounted on the downstream of venturi throttling set 1；
Data acquisition processing system 7 respectively with pressure transmitter 3, the first differential pressure transmitter 4, the second differential pressure transmitter 5 and
Temperature transmitter 6 connects.
Referring to Fig.2, the present invention also provides a kind of, the low liquid holdup moisture two phase flow based on venturi throttling set exists
Line measurement method, comprising the following steps:
S1, low liquid holdup flux of moisture measurement experiment is carried out, by measuring device by flanged joint in two phase flow experiment tube
On road, it is passed through a certain amount of gas phase and liquid phase, mass flow is respectively mg, ml；Acquire venturi throttling set upstream pressure point and
Moisture pressure differential deltap P between throat's pressure point1, moisture crushing Δ P between upstream pressure point and downstream pressure point2, flow through literary mound
In pipe moisture stress P and moisture temperature T.
S2, the density p that gas phase and liquid phase are calculated according to moisture stress P and moisture temperature TgAnd ρl, according to Bernoulli Jacob side
The apparent total mass flow rate m of moisture two-phase can be obtained in the derivation of journey and continuity equationapparent。
At=π d2/4
A=π D2/4
Wherein, β is the Throttling ratio of venturi throttling set, is defined as Venturi throat cross-sectional area and measurement pipeline
The ratio of sectional area, AtFor venturi throttling set throat cross-sectional area, A is measurement pipeline cross-sectional area, and D is measurement pipeline
Diameter, d are venturi throat diameter；E is the form factor of venturi throttling set.
S3, two-phase mass flow coefficient K=(m is definedg+ml)/mapparent, the gas phase mass flow that is obtained according to step S1
mg, liquid phase quality flow ml, moisture pressure differential deltap P1, moisture crushing Δ P2And the density p of gas phase and liquid phase that step S2 is obtainedg
And ρl, the apparent total mass flow rate m of moisture two-phaseapparent, establish two-phase mass flow coefficient K and Frg、FrlAnd ρg/ρlBetween
Relational expression；
K=aFrl+b
A=f (Frg,ρg/ρl)
B=f (Frg,ρg/ρl)
Wherein, FrgAnd FrlGas phase and density of liquid phase Froude number respectively, mlLiquid phase quality, mgGas phase quality, a are slope,
B is intercept.
S4, the liquid phase quality flow m obtained according to step S1l, moisture pressure differential deltap P1With moisture crushing Δ P2And step
The density p of gas phase and liquid phase that S2 is obtainedgAnd ρl, establish density of liquid phase Froude number FrlWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/
ρlBetween correlation.
Frl=f (δ, ρg/ρl)
Wherein, δ=Δ P2/ΔP1。
S5, according to two-phase mass flow coefficient K and the apparent total mass flow rate m of two-phaseapparent, construct gas phase mass flow
Computation model, formula are as follows；
S6, moisture pressure differential deltap P when acquisition moisture to be measured passes through Venturi tube1, moisture crushing Δ P2, moisture stress P and
Moisture temperature T；
S7, the moisture pressure differential deltap P obtained according to step S61With moisture crushing Δ P2Moisture Pressure Loss Ratio δ to be measured is calculated, according to
The moisture stress P and moisture temperature T that step S6 is obtained calculate density of gas phase ρ in moisture to be measuredgWith density of liquid phase ρl。
S8, moisture Pressure Loss Ratio δ, the density of gas phase ρ for obtaining step S7gWith density of liquid phase ρl, substitute into the liquid that step S4 is obtained
Phase density Froude number FrlCalculating correlation in, obtain the liquid phase quality flow m of moisture to be measuredl。
S9, the moisture pressure differential deltap P for obtaining step S6 and step S71, density of gas phase ρgWith density of liquid phase ρl, step S3 obtains
Two-phase the mass flow coefficient K and Fr arrivedg、FrlAnd ρg/ρlBetween the obtained density of liquid phase of relational expression and step S4 not labor
Moral number FrlWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlBetween correlation substitute into the meter of gas phase mass flow that step S5 is obtained
It calculates in model, obtains the calculating formula of gas phase mass flow:
mg=f (mapparent,Frg,δ,ρg/ρl)
S10, solution is iterated to the calculating formula of the obtained gas phase mass flow of step S8, as Δ mgWhen < 0.1%, repeatedly
In generation, completes, and obtains gas phase mass flow mg。
Embodiment 1
For entire measuring device through flanged joint on the pipeline for needing to measure, the internal diameter of measurement pipeline 2 is 50mm, literary mound
In 1 throat length of throttling set be equal to its throat diameter d, pressure point in upstream is located on 1 contraction section entrance of venturi throttling set
It swims at D/2 distance, pressure point in downstream is located at 1 expansion segment outlet downstream 6-D distance of venturi throttling set, venturi throttling dress
The Throttling ratio for setting 1 is 0.45, experimental pressure P=0.1~0.3MPa, and gas phase superficial velocity is 14.3~30.3m/s, and liquid phase is apparent
Speed is 0~0.016m/s, Lip river Ma parameter XLM=0~0.02, volume liquid holdup LVF=0~0.113%,
Wherein, Qg, QlThe respectively volume flow of gas phase and liquid phase.
Two-phase mass flow coefficient K and Fr in this embodimentg、FrlAnd ρg/ρlBetween relational expression it is as follows；K=exp
(1.0696-0.4237ln(ρg/ρl)-1.1567Frg)Frl+0.7847+30.7658(ρg/ρl)-0.0666Frg
Density of liquid phase Froude number Fr in this embodimentlWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlBetween correlation
It is as follows；
In the present embodiment, liquid phase quality flowmeter formula mlIt is as follows:
In the present embodiment, to the calculating formula m of gas phase mass flowg=f (mapparent,Frg,δ,ρg/ρl) be iterated, when
ΔmgWhen < 0.1%, iteration is completed, and gas phase mass flow m can be obtainedg。
As shown in Figures 3 and 4, the gas phase liquid phase flow for using method of the invention to measure for venturi throttling set flowmeter
Error analysis figure, it can be seen that gas phase flow rate relative error is less than ± 2.5%；In the case where confidence level 95%, liquid phase error
± 15%, the demand of industry spot can satisfy.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (8)
1. a kind of low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, which is characterized in that including following step
It is rapid:
S1, installation Venturi tube carries out low liquid holdup flux of moisture measurement experiment on measurement pipeline；
Acquire the moisture pressure differential deltap P between Venturi tube upstream pressure point and throat's pressure point1, upstream pressure point and downstream pressure
Moisture crushing Δ P between point2, moisture stress P, the moisture temperature T of Venturi tube are flowed through, and record passes through gas phase and liquid phase
Mass flow mgAnd ml；
S2, the density p that gas phase and liquid phase are calculated according to moisture stress P and moisture temperature TgAnd ρl, according to Bernoulli equation and
Continuity equation obtains the apparent total mass flow rate m of moisture two-phaseapparent；
S3, two-phase mass flow coefficient K, the gas phase mass flow m obtained according to step S1 are definedg, liquid phase quality flow ml, it is wet
Draught head Δ P1, moisture crushing Δ P2And the density p of gas phase and liquid phase that step S2 is obtainedgAnd ρl, moisture two-phase it is apparently total
Mass flow mapparent, establish two-phase mass flow coefficient K and Frg、FrlAnd ρg/ρlBetween relational expression；
Wherein, Frg、FrlGas phase and density of liquid phase Froude number respectively；
S4, the liquid phase quality flow m obtained according to step S1l, moisture pressure differential deltap P1With moisture crushing Δ P2And step S2 is obtained
The density p of the gas phase and liquid phase that arrivegAnd ρl, establish density of liquid phase Froude number FrlWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlIt
Between correlation；
S5, according to two-phase mass flow coefficient K and the apparent total mass flow rate m of two-phaseapparent, construct the calculating of gas phase mass flow
Model；
S6, moisture pressure differential deltap P when acquisition moisture to be measured passes through Venturi tube1, moisture crushing Δ P2, moisture stress P and moisture
Temperature T, and the density of gas phase ρ of moisture Pressure Loss Ratio δ to be measured and moisture to be measured is calculatedgWith density of liquid phase ρl；
S7, moisture Pressure Loss Ratio δ, the density of gas phase ρ for obtaining step S6gWith density of liquid phase ρl, it is close to substitute into the liquid phase that step S4 is obtained
Spend Froude number FrlCorrelation in, obtain the liquid phase quality flow m of moisture to be measuredl；
S8, the moisture pressure differential deltap P for obtaining step S61, density of gas phase ρgWith density of liquid phase ρl, the obtained two-phase quality of step S3
Flow coefficient k and Frg、FrlAnd ρg/ρlBetween the obtained density of liquid phase Froude number Fr of relational expression and step S4lAnd crushing
Than δ and gas-liquid density ratio ρg/ρlBetween correlation, substitute into the computation model of gas phase mass flow that step S5 is obtained, obtain
The calculating formula of gas phase mass flow；
S9, solution is iterated to the calculating formula of the obtained gas phase mass flow of step S8, as Δ mgWhen < 0.1%, iteration is complete
At obtaining gas phase mass flow mg。
2. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, feature exist according to claim 1
In the apparent total mass flow rate m of moisture two-phase in step S2apparentExpression formula it is specific as follows:
At=π d2/4
A=π D2/4
Wherein, β is the Throttling ratio of venturi throttling set, is defined as Venturi throat cross-sectional area and measurement pipeline section
Long-pending ratio, AtFor venturi throttling set throat cross-sectional area, A is measurement pipeline cross-sectional area, and D is the straight of measurement pipeline
Diameter, d are venturi throat diameter；E is the form factor of venturi throttling set.
3. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, feature exist according to claim 2
In two-phase mass flow coefficient K and Fr in step S3g、FrlAnd ρg/ρlBetween relational expression it is specific as follows:
K=aFrl+b
A=f (Frg,ρg/ρl)
B=f (Frg,ρg/ρl)
Wherein, FrgAnd FrlGas phase and density of liquid phase Froude number respectively, mlLiquid phase quality, mgGas phase quality, a are slope, and b is to cut
Away from.
4. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, feature exist according to claim 3
In density of liquid phase Froude number Fr in step S4lWith Pressure Loss Ratio δ and gas-liquid density ratio ρg/ρlBetween correlation it is as follows:
Frl=f (δ, ρg/ρl)
Wherein, δ=Δ P2/ΔP1。
5. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi throttling set according to claim 4,
It is characterized in that, the computation model of gas phase mass flow is as follows in step S5:
6. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, feature exist according to claim 5
In step S7 obtains the liquid phase quality flow m of moisture to be measuredlFormula it is as follows:
7. the low liquid holdup moisture two phase flow On-line Measuring Method based on venturi, feature exist according to claim 5
In the calculating formula for the gas phase mass flow that step S8 is obtained is as follows:
mg=f (mapparent,Frg,δ,ρg/ρl)
8. a kind of measurement of low liquid holdup moisture two phase flow On-line Measuring Method of any one of the claim 1-7 based on venturi
Device, which is characterized in that including the venturi throttling set (1), pressure transmitter (3), first poor being mounted on measurement pipeline 2
Pressure transmitter (4), the second differential pressure transmitter (5) and temperature transmitter (6)；
Pressure transmitter (3), the first differential pressure transmitter (4), the second differential pressure transmitter (5) and temperature transmitter (6) respectively with number
It is connected according to acquisition processing system (7)；
First differential pressure transmitter (4), for measuring between venturi throttling set (1) upstream pressure point and throat's pressure point
Pressure difference before moisture；
Second differential pressure transmitter (5), for measuring moisture between venturi throttling set (1) upstream pressure point and downstream pressure point
Total crushing；
Pressure transmitter (3), for detecting the moisture stress in measurement pipeline (2)；
Temperature transmitter (6), for detecting the moisture temperature in measurement pipeline (2)；
Data acquisition processing system (7), for receiving pressure transmitter (3), the first differential pressure transmitter (4), the second differential pressure transporting
The data of device (5) and temperature transmitter (6) acquisition, and the gas phase mass flow m in data output measurement pipeline based on the receivedg
With liquid phase quality flow ml。
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| CN113375741A (en) * | 2021-04-29 | 2021-09-10 | 安徽中控仪表有限公司 | Moisture two-phase flow metering device and method based on three-differential-pressure data fitting model |
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