CN102109451A - Non-contact conductive gas/liquid two-phase flow pattern identifying device and method - Google Patents
Non-contact conductive gas/liquid two-phase flow pattern identifying device and method Download PDFInfo
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Abstract
The invention discloses a non-contact conductive gas/liquid two-phase flow pattern identifying device and method thereof. The device comprises a gas/liquid two-phase flow measuring pipeline, an alternating-current excitation source, a capacitive coupling non-contact conductive sensor, a temperature sensor, a current/voltage conversion unit, an alternating-current rectifying unit, a filter unit, a direct-current amplifying unit, a data acquisition module and a computer. The method comprises the following steps: firstly, the capacitive coupling non-contact conductive sensor obtains conductance signals of flows of the gas/liquid two phases; then, characteristic values of the obtained conductance signals are extracted via a time domain collection method and a Fourier transformation method; and finally, the characteristic values are input to a flow pattern classifier for online identification. The device and method provided by the invention can effectively prevent reduction of the conductivity measurement performance caused by polarization effects and electrochemical corrosion effects, and improve the reliability and robustness of a flow pattern identification system; furthermore, the device is simple in structure, easy to mount, low in cost and the like. The invention provides a novel effective path for measuring parameters of the gas/liquid two phases in the fields such as energy source, petrochemical industry and the like.
Description
Technical field
The present invention relates to the multiphase flow measurement field, relate in particular to a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method.
Background technology
The gas-liquid two-phase streaming system extensively is present in industrial circles such as the energy, power, petrochemical complex.The flow pattern identification of biphase gas and liquid flow has great significance to the parameter measurement of two-phase flow system.Because two-phase flow flow characteristics complexity, existing flow pattern discrimination method is difficult to satisfy demand growing in the commercial Application.
It is fast to have response speed based on the Identification of Gas-Liquid Two-Phase of conductance measurement and parameter detection method, and therefore advantages such as strong interference immunity, for a long time, have received the concern of numerous researchers in the two-phase flow field based on the method for conductance measurement.At present, the Chang Yong Flow Patterns Identification Method of Two Phase Flow based on conductance measurement mainly contains: based on the two phase flow pattern identification of Electrical Resistance Tomography, based on the two phase flow pattern identification of probe-type conductance measurement, based on two phase flow pattern identification of array multi-electrode conductance measurement etc.Yet in these traditional flow pattern discrimination methods, the conductance measurement technology that is adopted is contact type measurement.In the practical application in industry occasion, its conducting probe or potential electrode directly contact with fluid, polarized and galvanic corrosion easily, thus cause the performance of conductance measurement to reduce, the reliability and the accuracy of flow pattern identification are affected.Therefore, the Flow Patterns Identification Method of Two Phase Flow based on the contact conductance measurement is difficult to satisfy the medium-term and long-term demand of using of industry.
Summary of the invention
The purpose of this invention is to provide a kind of novel, non-contact conductance Identification of Gas-Liquid Two-Phase device and method.
Non-contact conductance Identification of Gas-Liquid Two-Phase device comprises biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine, wherein the capacity coupling non-contact conductance sensor comprises isolated pipe, exciting electrode, detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline, the exciting electrode of sensor and detecting electrode are two ring electrodes, be affixed on the outer wall of isolated pipe at interval, and the metallic shield of ground connection is installed in the detecting electrode periphery, inductance module one end of sensor links to each other with exciting electrode through shielded conductor, the inductance module other end of sensor links to each other with ac-excited source, detecting electrode, the current/voltage-converted unit, the AC rectification unit, filter unit, the direct current amplifying unit, data acquisition module, computing machine links to each other in turn, temperature sensor, data acquisition module, computing machine links to each other in turn.
The step of non-contact conductance Identification of Gas-Liquid Two-Phase method is as follows:
1) utilize ac-excited source to produce sinusoidal voltage, be applied on the inductance module of capacity coupling non-contact conductance sensor, the frequency in ac-excited source is transferred to resonance frequency, make and detect loop generation series resonance, induction reactance by inductance module in the sensor balances out two coupling capacitances, one of them coupling capacitance is by conducting liquid, isolated pipe and exciting electrode form, another coupling capacitance is by conducting liquid, isolated pipe and form with detecting electrode, on detecting electrode, obtain the directly alternating current of reflection gas-liquid two-phase fluid equivalent conductance, through the current/voltage-converted unit, the AC rectification unit, after the processing of filter unit and direct current amplifying unit, by data acquisition module conductance signal is collected in the computing machine, obtain the fluid temperature (F.T.) of biphase gas and liquid flow by temperature sensor, and adopt in the computing machine by data acquisition system (DAS);
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value at every group of conductance signal
M, standard deviation
Std, low-frequency range energy distribution ratio
H 1 , Mid Frequency energy distribution ratio
H 2 With high band energy distribution ratio
H 3 Five characteristic parameters:
Mean value
M:
Standard deviation
Std:
Low-frequency range energy distribution ratio
H 1 For:
Mid Frequency energy distribution ratio
H 2 For:
High band energy distribution ratio
H 3 For:
Wherein,
U o Be the conductance signal that records by the capacity coupling non-contact conductance sensor,
E Total Be the gross energy of conductance signal,
E 1 For being distributed in the energy of 0-5Hz low-frequency range,
E 2 For being distributed in the energy of 5-25Hz Mid Frequency,
E 3 Be energy greater than the 25Hz high band;
At every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector
t:
；
3) with the proper vector of being extracted
tBe input in the flow pattern sorter of setting up by support vector machine, carry out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
The present invention proposes a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method, can effectively avoid the phenomenon of potential electrode because of being subjected to polarization effect, galvanic corrosion effect to cause measurement performance to reduce, the reliability and the robustness of Identification of Gas-Liquid Two-Phase system have been improved, have simple in structure simultaneously, easy to implement, low cost and other advantages is for the parameter measurement of biphase gas and liquid flow in the numerous areas such as the energy, power, oil, chemical industry provides novel, a feasible valid approach.
Description of drawings
Fig. 1 is the structured flowchart of noncontact electricity gas-liquid guide two phase flow pattern device for identifying;
Fig. 2 is the job step synoptic diagram of noncontact electricity gas-liquid guide Flow Patterns Identification Method of Two Phase Flow;
Fig. 3 is the simple equivalent circuit figure of capacity coupling non-contact conductance sensor.
Embodiment
The present invention is directed to the present situation of existing contact electricity gas-liquid guide Flow Patterns Identification Method of Two Phase Flow, proposed a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method.The conductance measurement technology that is adopted is the capacity coupling non-contact conductance measuring technique, can effectively avoid electrode polarization and galvanic corrosion effect, improved the performance of conductance measurement, the reliability and the robustness of Identification of Gas-Liquid Two-Phase system have been improved, and have noncontact, simple in structure, be easy to install low cost and other advantages.
As shown in Figure 1, non-contact conductance Identification of Gas-Liquid Two-Phase device comprises biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine, wherein the capacity coupling non-contact conductance sensor comprises isolated pipe, exciting electrode, detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline, the exciting electrode of sensor and detecting electrode are two ring electrodes, be affixed on the outer wall of isolated pipe at interval, and the metallic shield of ground connection is installed in the detecting electrode periphery, inductance module one end of sensor links to each other with exciting electrode through shielded conductor, the inductance module other end of sensor links to each other with ac-excited source, detecting electrode, the current/voltage-converted unit, the AC rectification unit, filter unit, the direct current amplifying unit, data acquisition module, computing machine links to each other in turn, temperature sensor, data acquisition module, computing machine links to each other in turn.
In measuring process, biphase gas and liquid flow enters the measurement pipeline, and flow through capacity coupling non-contact conductance sensor and temperature sensor.Obtain the alternating current of the different flow pattern therapeutic method to keep the adverse qi flowing downward liquid two-phase equivalent conductances of reflection by the capacity coupling non-contact conductance sensor, through the current/voltage-converted unit, the treatment conversion of AC rectification unit, filter unit, direct current amplifying unit is the output of direct current die mould conductance signal.Temperature by biphase gas and liquid flow in the temperature sensor measurement pipe
T, send into computing machine after utilizing data acquisition module with conductance signal, temperature signal collection and store.
As shown in Figure 2, the step of non-contact conductance Identification of Gas-Liquid Two-Phase method is as follows:
1) utilize ac-excited source to produce sinusoidal voltage
u In , be applied on the inductance module of capacity coupling non-contact conductance sensor, according to the principle of series resonance, the frequency in ac-excited source is transferred to resonance frequency
f 0 ,
Make and detect loop generation series resonance, by the induction reactance of inductance module in the sensor
LBalance out two coupling capacitances
C 1 With
C 2 , one of them coupling capacitance
C 1 Form another coupling capacitance by conducting liquid, isolated pipe and exciting electrode
C 2 Form by conducting liquid, isolated pipe with detecting electrode, that is:
Thereby make the resulting impedance of measuring in the loop
ZEqual the equivalent resistance part of biphase gas and liquid flow in the tested zone
R x The equivalent electrical circuit in measurement loop as shown in Figure 3.On detecting electrode, obtain the directly alternating current of reflection gas-liquid two-phase fluid equivalent conductance like this
After the processing of current/voltage-converted unit, AC rectification unit, filter unit and direct current amplifying unit, by data acquisition module conductance signal is collected in the computing machine, obtain the fluid temperature (F.T.) of biphase gas and liquid flow, and adopt in the computing machine by data acquisition system (DAS) by temperature sensor;
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value at every group of conductance signal
M, standard deviation
Std, low-frequency range energy distribution ratio
H 1 , Mid Frequency energy distribution ratio
H 2 With high band energy distribution ratio
H 3 Five characteristic parameters:
Mean value
M:
Standard deviation
Std:
Low-frequency range energy distribution ratio
H 1 For:
Mid Frequency energy distribution ratio
H 2 For:
High band energy distribution ratio
H 3 For:
Wherein,
U o Be the conductance signal that records by the capacity coupling non-contact conductance sensor,
E Total Be the gross energy of conductance signal,
E 1 For being distributed in the energy of 0-5Hz low-frequency range,
E 2 For being distributed in the energy of 5-25Hz Mid Frequency,
E 3 Be energy greater than the 25Hz high band;
At every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector
t:
3) with the proper vector of being extracted
tBe input in the flow pattern sorter of setting up by support vector machine, carry out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
The method of " 1v1 " has been adopted in the foundation of flow pattern sorter, sets up a two-value sorter between per two kinds of flow patterns, builds together and has found 10 sub-classifiers, and the expression formula of each sub-classifier is as follows:
Wherein,
---the classification logotype of flow pattern;
Adopt " ballot method " to realize many classification problems of flow pattern then.Work as proper vector
When being input in 10 sub-classifiers being set up, each sorter is all differentiated, and is that corresponding flow pattern " is thrown a last ticket ", and the last maximum flow pattern of number of votes obtained is current flow pattern, thereby realizes the on-line identification of flow pattern.
Now the biphase gas and liquid flow that has formed at air and tap water is to test on the horizontal glass pipeline of 4.0mm at internal diameter, utilize method and apparatus mentioned among the present invention, realize the on-line identification of flow pattern of gas-liquid two-phase flow, and obtained good identification result and accuracy rate.Table 1 provides identification result and the accuracy rate under the 4.0mm caliber.
The Identification of Gas-Liquid Two-Phase result (internal diameter 4.0mm) that table 1 is measured based on non-contact conductance
| ? | Number of training | The test specimens given figure | Error sample | Recognition accuracy |
| Laminar flow | 21 | 21 | 1 | 95.2% |
| Wave flow | 22 | 21 | 2 | 90.5% |
| Bubble flow | 31 | 31 | 2 | 93.5% |
| Slug flow | 34 | 35 | 1 | 97.1% |
| Annular flow | 24 | 23 | 1 | 95.7% |
Claims (2)
1. non-contact conductance Identification of Gas-Liquid Two-Phase device, it is characterized in that comprising biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine, wherein the capacity coupling non-contact conductance sensor comprises isolated pipe, exciting electrode, detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline, the exciting electrode of sensor and detecting electrode are two ring electrodes, be affixed on the outer wall of isolated pipe at interval, and the metallic shield of ground connection is installed in the detecting electrode periphery, inductance module one end of sensor links to each other with exciting electrode through shielded conductor, the inductance module other end of sensor links to each other with ac-excited source, detecting electrode, the current/voltage-converted unit, the AC rectification unit, filter unit, the direct current amplifying unit, data acquisition module, computing machine links to each other in turn, temperature sensor, data acquisition module, computing machine links to each other in turn.
2. non-contact conductance Identification of Gas-Liquid Two-Phase method that use is installed according to claim 1 is characterized in that its step is as follows:
1) utilize ac-excited source to produce sinusoidal voltage, be applied on the inductance module of capacity coupling non-contact conductance sensor, the frequency in ac-excited source is transferred to resonance frequency, make and detect loop generation series resonance, induction reactance by inductance module in the sensor balances out two coupling capacitances, one of them coupling capacitance is by conducting liquid, isolated pipe and exciting electrode form, another coupling capacitance is by conducting liquid, isolated pipe and form with detecting electrode, on detecting electrode, obtain the directly alternating current of reflection gas-liquid two-phase fluid equivalent conductance, through the current/voltage-converted unit, the AC rectification unit, after the processing of filter unit and direct current amplifying unit, by data acquisition module conductance signal is collected in the computing machine, obtain the fluid temperature (F.T.) of biphase gas and liquid flow by temperature sensor, and adopt in the computing machine by data acquisition system (DAS);
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value at every group of conductance signal
M, standard deviation
Std, low-frequency range energy distribution ratio
H 1 , Mid Frequency energy distribution ratio
H 2 With high band energy distribution ratio
H 3 Five characteristic parameters:
Mean value
M:
Standard deviation
Std:
Low-frequency range energy distribution ratio
H 1 For:
Mid Frequency energy distribution ratio
H 2 For:
High band energy distribution ratio
H 3 For:
Wherein,
U o Be the conductance signal that records by the capacity coupling non-contact conductance sensor,
E Total Be the gross energy of conductance signal,
E 1 For being distributed in the energy of 0-5Hz low-frequency range,
E 2 For being distributed in the energy of 5-25Hz Mid Frequency,
E 3 Be energy greater than the 25Hz high band;
At every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector
t:
3) with the proper vector of being extracted
tBe input in the flow pattern sorter of setting up by support vector machine, carry out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
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| CN102323442A (en) * | 2011-09-07 | 2012-01-18 | 浙江大学 | Fluid flow rate and flow measurement device and method |
| CN102522831A (en) * | 2011-12-08 | 2012-06-27 | 辽宁省电力有限公司沈阳超高压分公司 | Non-contact electric field type induction power access method and power access apparatus thereof |
| CN102590030A (en) * | 2012-01-18 | 2012-07-18 | 浙江大学 | Small-passage gas-liquid phase flow pattern identification device and method based on photovoltaic array sensor |
| CN102706534A (en) * | 2012-06-01 | 2012-10-03 | 绍兴文理学院 | Gas-liquid two-phase flow pattern recognition method |
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