CN201210060Y - Liquid-liquid two-phase stream measurement apparatus adopting main phase determinator - Google Patents
Liquid-liquid two-phase stream measurement apparatus adopting main phase determinator Download PDFInfo
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- CN201210060Y CN201210060Y CNU2008200828958U CN200820082895U CN201210060Y CN 201210060 Y CN201210060 Y CN 201210060Y CN U2008200828958 U CNU2008200828958 U CN U2008200828958U CN 200820082895 U CN200820082895 U CN 200820082895U CN 201210060 Y CN201210060 Y CN 201210060Y
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- 239000000463 material Substances 0.000 claims description 3
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- 230000005514 two-phase flow Effects 0.000 abstract description 20
- 239000000126 substance Substances 0.000 abstract description 3
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Abstract
The utility model discloses a liquid-liquid two-phase flow measurement device which adopts a main conductance phase discriminator. The measurement device comprises a measurement pipeline, a conductance sensor, a throttling element, a volumetric flow meter, a differential pressure transmitter, a temperature transmitter, a conductance measurement and acquisition circuit, a data acquisition circuit and a computer; wherein, the conductance sensor is connected with the computer through the conductance measurement and acquisition circuit, and each transmitter and flow meter are connected with the computer through the data acquisition circuit. The mixed density, total mass flow and sub-phase flow of the two-phase flow are acquired according to the total volumetric flow obtained by the volumetric flow meter, the differential pressure obtained by the throttling element and the temperature obtained by the temperature transmitter. No mixer is required to premix the fluid; simultaneously; the main conductance phase discriminator with the conductance sensor as the main body is used for discriminating the main conductance phase of the two-phase flow; thus the throttling element selects the flow coefficient of the two-phase flow; and the measurement accuracy is improved. The utility model has the advantages of simple structure, good reliability, low cost and wide scope of application, and can be used for measuring the liquid-liquid two-phase flow in such fields as the petroleum, chemical and the like.
Description
Technical field
The utility model belongs to field of measuring techniques, relates in particular to the liquid-liquid diphasic flow measurement mechanism that adopts dominant phase arbiter.
Background technology
Liquid-liquid diphasic flow extensively exists in industrial circles such as oil and chemical industry.Existing metering method has densitometer to obtain separate phase flow rate in conjunction with the method for single-phase flowmeter, but measuring accuracy is undesirable during actual the use, cost is high, vibrating tube densimeter commonly used is very responsive to presence states such as the temperature of medium, pressure, the variation of ambient condition directly influences the measurement of density and flow, and there is safety problem in gamma ray density meter, operating conditions is required high.Earlier liquid liquid two is separated, using single-phase flow score then Ji Liang not be the method for often using yet, but separation vessel is bulky and separation needs the regular hour, and the metering real-time is affected.The coriolis mass flowmeters of Chu Xianing also can be used for carrying out individual phase measurement in recent years, but had shortcomings such as cost costliness, service condition harshness, installation and maintenance inconvenience.In addition, with the mixed flow device two-phase flow is mixed earlier and become homogeneous flow, the method of utilizing the combination of single-phase flowmeter such as restriction flowmeter, volumeter etc. to measure again, measuring accuracy are still needed and are further improved, and the mixed flow device has also been introduced extra crushing.
The utility model adopts the combination and the dominant phase arbiter of single-phase flow instrument to carry out the measurement of liquid-liquid diphasic flow, need not use mixed flow device convection cell to be pre-mixed, not only simplified system architecture but also reduced crushing, utilized liquid-liquid diphasic flow dominant phase arbiter to improve the two-phase flow measurement precision simultaneously based on conductivity sensor.
Summary of the invention
The purpose of this utility model provides a kind of liquid-liquid diphasic flow measuring method and device that adopts dominant phase arbiter.
Adopt the liquid-liquid diphasic flow measurement mechanism of dominant phase arbiter to have the metering pipeline, on the metering pipeline, conductivity sensor, restricting element, volumetric displacement meter, temperature transmitter are installed successively, conductivity sensor is connected with computing machine through conductance measurement and Acquisition Circuit, restricting element is connected with differential pressure transmitter, differential pressure transmitter, volumetric displacement meter, temperature transmitter are connected with computing machine through data acquisition circuit, and conductivity sensor, conductance measurement and Acquisition Circuit and computing machine constitute dominant phase arbiter.
The sensing pipeline section of described conductivity sensor adopts pmma material, two ends link to each other with tested pipeline by joint flange, n electrode is installed around the sensing pipeline section inwall equally spacedly, n 〉=6 wherein, electrode passes through the radioshielding line and links to each other with conductance measurement and Acquisition Circuit.
Restricting element is a Venturi tube, and volumetric flow rate is counted volumeter.
The simple single-phase flowmeter of the utility model utilization has solved the liquid-liquid diphasic flow problems of measurement that always is difficult to fine solution on the engineering.Do not need to use the mixed flow device to carry out being pre-mixed of fluid, not only simplify system architecture but also reduced the crushing of measurement mechanism, and the differentiation that utilizes leading phase overcome adopt that single restricting element coefficient of flow causes than mistake, improved measuring accuracy, having does not simultaneously need liquid liquid two to be separated, to be with advantage such as temperature compensation, good reliability, cost be low, applied widely, can be used for the measurement of the liquid-liquid diphasic flow system in the numerous areas such as oil, chemical industry.
Description of drawings
Fig. 1 is the structured flowchart that adopts the liquid-liquid diphasic flow measurement mechanism of dominant phase arbiter;
Fig. 2 is the composition structured flowchart of dominant phase arbiter;
Fig. 3 (a) is the longitudinal sectional drawing (is example with 16 needle electrodes) of conductivity sensor;
Fig. 3 (b) is the transverse cross-sectional view (is example with 16 needle electrodes) of conductivity sensor;
Fig. 4 is the job step synoptic diagram of the leading phase discrimination module of computing machine in the dominant phase arbiter;
Fig. 5 is the job step synoptic diagram that adopts the liquid-liquid diphasic flow measuring method of dominant phase arbiter.
Embodiment
As shown in Figure 1, adopt the liquid-liquid diphasic flow measurement mechanism of dominant phase arbiter to have the metering pipeline, on the metering pipeline, conductivity sensor, restricting element, volumetric displacement meter, temperature transmitter are installed successively, conductivity sensor is connected with computing machine through conductance measurement and Acquisition Circuit, restricting element is connected with differential pressure transmitter, and differential pressure transmitter, volumetric displacement meter, temperature transmitter are connected with computing machine through data acquisition circuit.Conductivity sensor, conductance measurement and Acquisition Circuit and computing machine constitute dominant phase arbiter.Described restricting element is a Venturi tube, and volumetric flow rate is counted volumeter (comprising gear meter, rotz flowmeter, blade flowmeter etc.).
During measurement, liquid-liquid diphasic flow enters the metering pipeline, the conductivity sensor of flowing through, restricting element and volumetric displacement meter.Conductance measurement and Acquisition Circuit link to each other with conductivity sensor, measure a plurality of electric conductivity values of two-phase flow in the pipeline, and it is sent into computing machine.The supporting installation of differential pressure transmitter and restricting element, differential pressure signal change the standard electric signal into sends into computing machine through data acquisition circuit.Volumetric displacement meter obtains the total volumetric flow rate of liquid-liquid diphasic flow in the pipeline, and changes flow signal into the standard electric signal and send into computing machine through data acquisition circuit.Temperature transmitter is used for measuring the temperature T of two-phase flow, and changes temperature signal into the standard electric signal and send into computing machine through data acquisition circuit.Be provided with memory module in computing machine, the storage density of two-phase fluid under different temperatures and the coefficient of flow of restricting element (comprise the COEFFICIENT K of demarcating with monophasic fluid 1
1With the COEFFICIENT K of demarcating with monophasic fluid 2
2) etc. data, computing machine is handled in real time, carries out the differentiation of the leading phase of liquid-liquid diphasic flow, and obtains hybrid density, total mass flow rate and separate phase flow rate etc.
It is pointed out that with respect to other restricting elements such as orifice plate, nozzles, the pipeline crushing minimum that Venturi tube produced, so restricting element is selected Venturi tube for use.Why volumetric displacement meter selects volumeter for use, be because the measuring accuracy of volumeter is higher, and the variation of liquid-liquid diphasic flow flow pattern is very little to the influence of its precision.
No matter which kind of restricting element what this device adopted is, all can utilize the incompressible fluid volumetric flow rate to calculate formula:
Wherein: Δ p---the liquid-liquid diphasic flow differential pressure that restricting element produces of flowing through,
ρ---liquid-liquid diphasic flow hybrid density,
The coefficient of flow of K---restricting element.
Since the incompressibility and the continuity equation of liquid, the total volumetric flow rate Q that volumetric displacement meter records
vBe the volumetric flow rate q of the restricting element of flowing through
vSo, obtain:
Formula (2) is carried out conversion, and the hybrid density that obtains liquid-liquid diphasic flow is:
More than various in, the flow coefficient k of restricting element is an important parameters, but because at present also fewer to the Discharge Coefficient Study of restricting element in the liquid-liquid diphasic flow, uses the single-phase flow coefficient of flow of restricting element in therefore measuring.And the flow coefficient k of demarcating with monophasic fluid 1
1With the flow coefficient k of demarcating with monophasic fluid 2
2Be different, this species diversity can be bigger under the less situation of flow.Therefore for overcome adopt that single coefficient of flow causes than mistake, improve the measuring accuracy of liquid-liquid diphasic flow, utilize dominant phase arbiter that the leading of liquid-liquid diphasic flow differentiated mutually, select the two-phase flow coefficient of suitable coefficient of flow as restricting element according to differentiating the result.(fluid 1 contains rate x if fluid 1 is taken phase as the leading factor
1〉=60%), then its two-phase flow coefficient is chosen as the flow coefficient k of demarcating with single-phase fluid 1
1, (fluid 2 contains rate x if fluid 2 is taken phase as the leading factor
2〉=60%), then the two-phase flow coefficient of restricting element is chosen as the flow coefficient k of demarcating with monophasic fluid 2
2, if liquid-liquid diphasic flow (40%＜x in an interim state
1＜60%), then its two-phase flow coefficient is chosen as K
1And K
2Mean value, that is:
As shown in Figure 2, dominant phase arbiter has the leading phase discrimination module of conductivity sensor, conductance measurement and Acquisition Circuit, computing machine that is connected.Conductivity sensor as shown in Figure 3, has sensing pipeline section 1, sensing pipeline section 1 adopts pmma material, two ends link to each other with tested pipeline by joint flange 2, n electrode 3 (n 〉=6 are installed around the sensing pipeline section inwall equally spacedly, n=16 among the figure), electrode can be point-like, rectangle or other shapes (electrode is a needle-like among the figure), and electrode links to each other with conductance measurement and Acquisition Circuit by radioshielding line 4.Conductance measurement and Acquisition Circuit adopt the mode of " adjacent electrode that adjacent electrode injects exciting current, non-excitation detects voltage " to obtain the electric conductivity value of two-phase flow in the pipeline (n (n-3)/2 altogether), and it is sent into computing machine.
Descend electric conductivity value there are differences mutually because two-phase flow is different leading, dominant phase arbiter is dominated the differentiation of phase based on this difference, and method of discrimination comprises the steps:
1) conductance measurement and Acquisition Circuit are obtained the electric conductivity value of two-phase flow in the pipeline;
2) the leading phase discrimination module of computing machine uses the sorter of being set up by least square method supporting vector machine (LS-SVM), and according to conductance signal the flow state of liquid-liquid diphasic flow is divided into three classes: fluid 1 is taken phase as the leading factor, and (volume of fluid 1 contains rate x
1〉=60%), fluid 2 is taken phase as the leading factor (volume of fluid 2 is contained rate x
2〉=60%) transition state (40%＜x,
1＜60%).
The foundation of sorter can be adopted the One-versus-Rest algorithm in the support vector machine multicategory classification problem, setting up a plurality of two class sorters makes a distinction each class and other two classes respectively, therefore need three sub-classifiers altogether, the expression formula of each sub-classifier is as follows:
Wherein, r---n (n-3)/2 vector that electric conductivity value is formed;
Y---category label;
N---the number of sample in the training set;
(r
i, y
i)---the corresponding category label of electric conductivity value vector sum in the training set, i=1,2 ..., N;
α
i, b---classifier parameters, i=1,2 ..., N;
ψ ()---the kernel function of LS-SVM sorter,
σ is its parameter.
Each parameter alpha in the sorter
i, b, σ is obtained through computation optimization by training dataset and LS-SVM algorithm.
The job step of the leading phase discrimination module of computing machine is sent into the electric conductivity value that measures in three sub-classifiers and to be classified as shown in Figure 4, according to three classification results the flow state of this moment is inferred, is included into a most probable class.Determine the flow coefficient k of restricting element according to differentiating result and formula (4) then, and then calculate the hybrid density ρ of liquid-liquid diphasic flow by formula (3).
Because whole metering pipeline is shorter, can think that the temperature of whole pipeline is consistent, computing machine extracts the density p of two-phase fluid when the temperature T according to measured temperature T from memory module
1And ρ
2If x
1And x
2The branch phase volume that is two fluids respectively contains rate, according to ρ=x
1ρ
1+ x
2ρ
2And x
1+ x
2=1, can obtain:
Total mass flow rate: Q
m=ρ Q
v(6)
The volume of fluid 1 contains rate:
The volume of fluid 2 contains rate:
The volumetric flow rate of fluid 1: Q
V1=x
1Q
v(9)
The volumetric flow rate of fluid 2: Q
V2=x
2Q
v(10)
The mass rate of fluid 1: Q
M1=ρ
1Qv
1(11)
The mass rate of fluid 2: Q
M2=ρ
2Qv
2(12)
To sum up, the step of the liquid-liquid diphasic flow measuring method of employing dominant phase arbiter is as shown in Figure 5:
1) obtains conductance signal, the total volumetric flow rate Q of liquid-liquid diphasic flow by each measurement instrument
v, differential pressure signal Δ p and temperature T;
2) dominant phase arbiter is determined the flow coefficient k of restricting element according to this according to the leading phase of conductance signal differentiation liquid-liquid diphasic flow by formula (4);
3) check in the density p of each fluid by temperature T
1And ρ
2, then with differential pressure signal Δ p, total volumetric flow rate Q
v, flow coefficient k, each fluid density ρ
1, ρ
2Substitution formula (3), formula (6)～(12) calculate data such as two-phase flow hybrid density, total mass flow rate and each fluid separate phase flow rate.
Be to test on the horizontal tube of 15mm, 25mm and 40mm at internal diameter at the diesel fuel-water two-phase flow, conductivity sensor adopts 16 needle electrodes, and volumeter adopts oval gear flowmeter, and the profit total volumetric flow rate is 1.2～5.5m
3/ h divides phase content to cover 0% to 100%.Test findings shows, if the coefficient of flow that Venturi tube adopts single single-phase water to demarcate, the measuring relative errors of two-phase flow hybrid density and total mass flow rate can reach 8.2%, 8.3% respectively, if the coefficient of flow that adopts single-phase diesel oil to demarcate, the measuring relative errors of hybrid density and total mass flow rate has then reached 7.9%, 8.0% respectively, and use this method and device, the measuring relative errors of two-phase flow hybrid density and total mass flow rate is all in ± 4%.
Claims (3)
1. liquid-liquid diphasic flow measurement mechanism that adopts dominant phase arbiter, it is characterized in that: it has the metering pipeline, on the metering pipeline, conductivity sensor, restricting element, volumetric displacement meter, temperature transmitter are installed successively, conductivity sensor is connected with computing machine through conductance measurement and Acquisition Circuit, restricting element is connected with differential pressure transmitter, differential pressure transmitter, volumetric displacement meter, temperature transmitter are connected with computing machine through data acquisition circuit, and conductivity sensor, conductance measurement and Acquisition Circuit and computing machine constitute dominant phase arbiter.
2. a kind of liquid-liquid diphasic flow measurement mechanism according to claim 1, the sensing pipeline section (1) that it is characterized in that described conductivity sensor adopts pmma material, two ends link to each other with tested pipeline by joint flange (2), n electrode (3) is installed around the sensing pipeline section inwall equally spacedly, n 〉=6 wherein, electrode links to each other with conductance measurement and Acquisition Circuit by radioshielding line (4).
3. a kind of liquid-liquid diphasic flow measurement mechanism according to claim 1 is characterized in that described restricting element is a Venturi tube, and volumetric flow rate is counted volumeter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MD20100049A2 (en) * | 2010-04-13 | 2011-11-30 | Николае БЕЛДИМАН | Device for measuring the fluid flow rate in the transport pipeline |
| CN103808378A (en) * | 2012-11-14 | 2014-05-21 | 克洛纳有限公司 | Nuclear magnetic flow meter and method for operation of nuclear magnetic flow meters |
| CN104888493A (en) * | 2015-06-05 | 2015-09-09 | 海正药业(杭州)有限公司 | Device for realizing liquid-liquid extraction separation self-control through electric conduction and method thereof |
| CN110726444A (en) * | 2019-08-22 | 2020-01-24 | 无锡洋湃科技有限公司 | Wet gas flow metering method and device based on Coriolis mass flowmeter |
-
2008
- 2008-01-31 CN CNU2008200828958U patent/CN201210060Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MD20100049A2 (en) * | 2010-04-13 | 2011-11-30 | Николае БЕЛДИМАН | Device for measuring the fluid flow rate in the transport pipeline |
| CN103808378A (en) * | 2012-11-14 | 2014-05-21 | 克洛纳有限公司 | Nuclear magnetic flow meter and method for operation of nuclear magnetic flow meters |
| CN104888493A (en) * | 2015-06-05 | 2015-09-09 | 海正药业(杭州)有限公司 | Device for realizing liquid-liquid extraction separation self-control through electric conduction and method thereof |
| CN110726444A (en) * | 2019-08-22 | 2020-01-24 | 无锡洋湃科技有限公司 | Wet gas flow metering method and device based on Coriolis mass flowmeter |
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Granted publication date: 20090318 Termination date: 20100131 |