CN103018285A - Non-contact type conductive measurement device and method for phase content of gas-liquid two-phase flow - Google Patents
Non-contact type conductive measurement device and method for phase content of gas-liquid two-phase flow Download PDFInfo
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Abstract
The invention discloses a non-contact type conductive measurement device and method for the phase content of gas-liquid two-phase flow. The device comprises an alternating-current (AC) excitation source, an insulating pipeline, six electrodes, inductance modules, electronic switches, a logic electronic switch control circuit, signal processing modules, a data acquisition module and a microcomputer. According to the device, a six-electrode non-contact type conductive sensor is developed, and the condition that the six-electrode non-contact type conductive sensor is applied to the measurement of the phase content of the gas-liquid two-phase flow is realized. The method is a novel non-contact type conductive measurement technology which is applicable to the gas-liquid two-phase flow, of which a continuous phase is conductive liquid, and the electrodes of the sensor are not in direct contact with the flow, so that the flowing form of the gas-liquid two-phase flow is not affected, the problems of electrode polarization, electrochemical corrosion and the like of the traditional contact type conductive measurement methods are effectively solved, the influence on phase content measurement caused by flowing form change is overcome to a certain extent, and then, an effective novel way for the measurement of the phase content of the gas-liquid two-phase flow is provided.
Description
Technical field
The present invention relates to gas-liquid two-phase flow containing rate measuring technique, relate in particular to a kind of non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism and method.
Background technology
Biphase gas and liquid flow extensively is present in numerous industrial processs such as oil, chemical industry, the energy, power.Phase content is one of important parameter that characterizes the gas-liquid two-phase properties of flow, and its on-line measurement all has important effect for the condition monitoring of two-phase flow system, real-time control, safe operation, energy efficiency etc.Though a lot of phase content measuring methods is arranged at present, but because the complicacy that biphase gas and liquid flow flows, existing detection method also fails to satisfy the practical application request in the industry, and the On-line Measuring Method of phase content still needs further research and development.
In the measuring two-phase flow parameter field, the gas-liquid two-phase flow containing rate measurement of leading with capacitance detecting based on electricity is the main aspect of two-phase flow research field.At present existing multiple electricity is led the measurement that detection technique is applied to the two-phase flow phase content.Yet, existing electricity is led detection technique and is mainly the contact method for measuring conductance, be mainly used in the gas-liquid phase pipe of gas-liquid two-phase fluid external phase conduction, sensor electrode is installed on the tested pipeline inwall, electrode surface directly contacts with the interior detected fluid of pipeline, the problems such as easily generating electrodes polarization, galvanic corrosion, thus measurement is exerted a certain influence, and the application of its reality also is restricted.Be installed on around the tested pipeline outer wall based on the gas-liquid two-phase flow containing rate sensor electrode of capacitance detecting, its electrode can be avoided contacting with detected fluid.But, be mainly used in the measurement that gas-liquid two-phase fluid external phase is non-electrically conductive liquid based on the detection method of electric capacity.
The capacity coupling non-contact conductance measuring technique is a kind of novel non-contact electric conductivity measuring technique.Its electrode does not directly contact with fluid, has effectively avoided traditional contact method for measuring conductance problem, the problem includes: problems such as electrode polarization and galvanic corrosion, and has had the advantages such as simple in structure, that robustness is good.Yet, the at present research of this technology and the measurement of using kapillary in the fields such as mainly being confined to analytical chemistry or following caliber solution conductivity, ion concentration etc., also be in the starting stage in the application aspect the measurement of gas-liquid two-phase flow containing rate, bibliographical information is also fewer.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of feasible, effectively non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism and method are provided.
Non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism comprises ac-excited source, the first inductor module, the first electronic switch, the second electronic switch, the 3rd electronic switch, isolated pipe, the first electrode, the second electrode, third electrode, the 4th electrode, the 5th electrode, the 6th electrode, quadrielectron switch, the 5th electronic switch, the 6th electronic switch, the electronic switch control logic circuit, the first signal processing module, the secondary signal processing module, the 3rd signal processing module, data acquisition module, microcomputer, the second inductor module, the 3rd inductor module; The first electrode, the second electrode, third electrode, the 4th electrode, the 5th electrode, the 6th electrode is evenly distributed on around the isolated pipe outer wall, the first electrode links to each other with an end of the second electronic switch, the second electrode links to each other with an end of the first inductor module, third electrode links to each other with an end of the 3rd electronic switch, the 4th electrode links to each other with an end of the second inductor module, the 5th electrode links to each other with an end of the first electronic switch, the 6th electrode links to each other with an end of the 3rd inductor module, the other end of the first electronic switch, the other end of the second electronic switch, the other end of the 3rd electronic switch links to each other with ac-excited source respectively, the other end of the first inductor module links to each other with an end of quadrielectron switch, the other end of the second inductor module links to each other with the 5th electronic switch one end, the other end of the 3rd inductor module links to each other with the 6th electronic switch one end, the other end of quadrielectron switch links to each other with the input end of first signal processing module, the other end of the 5th electronic switch links to each other with the input end of secondary signal processing module, the other end of the 6th electronic switch links to each other with the input end of the 3rd signal processing module, the control end of the first electronic switch, the control end of quadrielectron switch links to each other with the first output terminal of electronic switch control logic circuit, the control end of the second electronic switch, the control end of the 5th electronic switch links to each other with the second output terminal of electronic switch control logic circuit, the control end of the 3rd electronic switch, the control end of the 6th electronic switch links to each other with the 3rd output terminal of electronic switch control logic circuit, the output terminal of first signal processing module links to each other with the first input end of data acquisition module, the output terminal of secondary signal processing module links to each other with the second input end of data acquisition module, the output terminal of the 3rd signal processing module links to each other with the 3rd input end of data acquisition module, and the output terminal of data acquisition module links to each other with microcomputer; The first electrode, third electrode, the 5th electrode are exciting electrode, and the second electrode, the 4th electrode, the 6th electrode are detecting electrode.
The step of non-contact electric conductivity gas-liquid two-phase flow containing rate measuring method is as follows:
1) six electrode non-contact electric conductivity sensors are comprised of six electrodes that are evenly distributed on the isolated pipe outer tube wall circumference, six electronic switches are divided into three pairs of electronic switches and realize three kinds of duties, three pairs of electronic switches are respectively: the first electronic switch and quadrielectron switch, the second electronic switch and the 5th electronic switch, the 3rd electronic switch and the 6th electronic switch, the electronic switch control logic circuit is by 555 timers, shift register, rejection gate forms, the sequential pulse sequential that the electronic switch control logic circuit produces is used for successively switch operating state of three pairs of electronic switches of control, so that three pairs of electronic switches are in closure state successively, when the first electronic switch and quadrielectron switch are in closure state, the second electronic switch, the 5th electronic switch, the 3rd electronic switch, the 6th electronic switch disconnects, when the second electronic switch, when the 5th electronic switch is in closure state, the first electronic switch, quadrielectron switch, the 3rd electronic switch, the 6th electronic switch disconnects, when the 3rd electronic switch, when the 6th electronic switch is in closure state, the first electronic switch, quadrielectron switch, the second electronic switch, the 5th electronic switch disconnects;
2) excitation frequency that ac-excited source is set is f, and output voltage is U
InWhen the first electronic switch and quadrielectron switch are in closure state, the second electronic switch, the 5th electronic switch, the 3rd electronic switch, the 6th electronic switch disconnect, form article one alternating current path by ac-excited source, the first electronic switch, the 5th electrode, isolated pipe, the second electrode, the first inductor module, quadrielectron switch, the equivalent electrical circuit impedance of article one alternating current path is
Wherein, L
1Be the inductance of the first inductor module, the first coupling capacitance C
1Be the coupling capacitance that the 5th electrode, isolated pipe and pipeline inner fluid form, the second coupling capacitance C
2Be the coupling capacitance that the second electrode, isolated pipe and pipeline inner fluid form, first fluid equivalent resistance R
X1Be the equivalent resistance of the 5th electrode and the second interelectrode fluid, the excitation frequency when ac-excited source is
The time, article one, alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of article one alternating current path is zero, article one, the equivalent electrical circuit resulting impedance of alternating current path is pure resistive, when the second electronic switch, when the 5th electronic switch is in closure state, the first electronic switch, quadrielectron switch, the 3rd electronic switch, the 6th electronic switch disconnects, by ac-excited source, the second electronic switch, the first electrode, isolated pipe, the 4th electrode, the second inductor module, the 5th electronic switch forms the second alternating current path, and the equivalent electrical circuit impedance of second alternating current path is
Wherein, L
2Be the inductance of the second inductor module, the 3rd coupling capacitance C
3Be the coupling capacitance that the first electrode, isolated pipe and pipeline inner fluid form, the 4th coupling capacitance C
4Be the coupling capacitance that the 4th electrode, isolated pipe and pipeline inner fluid form, second fluid equivalent resistance R
X2Be the equivalent resistance of the first electrode and the 4th interelectrode fluid, the excitation frequency when ac-excited source is
The time, the second alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of second alternating current path is zero, the equivalent electrical circuit resulting impedance of second alternating current path is pure resistive, when the 3rd electronic switch, when the 6th electronic switch is in closure state, the first electronic switch, quadrielectron switch, the second electronic switch, the 5th electronic switch disconnects, by ac-excited source, the 3rd electronic switch, third electrode, isolated pipe, the 6th electrode, the 3rd inductor module, the 6th electronic switch forms the 3rd alternating current path, and the equivalent electrical circuit impedance of the 3rd alternating current path is
Wherein, L
3Be the inductance of the 3rd inductor module, the 5th coupling capacitance C
5Be the coupling capacitance that third electrode, isolated pipe and pipeline inner fluid form, the 6th coupling capacitance C
6Be the coupling capacitance that the 6th electrode, isolated pipe and pipeline inner fluid form, the 3rd fluid equivalent resistance R
X3Be the equivalent resistance of third electrode and the 6th interelectrode fluid, the excitation frequency when ac-excited source is
The time, the 3rd alternating current path is in the series resonance state, and then the equivalent electrical circuit imaginary impedance of the 3rd alternating current path is zero, and the equivalent electrical circuit resulting impedance of the 3rd alternating current path is pure resistive;
3) under the series resonance state, article one, the equivalent electrical circuit of alternating current path, the equivalent electrical circuit of second alternating current path, article three, the equivalent electrical circuit of alternating current path becomes pure resistive, under the sequential pulse sequential control effect that the electronic switch control logic circuit produces, when the first electronic switch and quadrielectron switch are in closure state, the second electrode directly links to each other with the input end of first signal processing module by the first inductor module, the input end of first signal processing module obtains one group of independence conductance signal from the second electrode, when the second electronic switch and the 5th electronic switch are in closure state, the 4th electrode directly links to each other with the input end of secondary signal processing module by the second inductor module, the input end of secondary signal processing module obtains one group of independence conductance signal from the 4th electrode, when the 3rd electronic switch and the 6th electronic switch are in closure state, the 6th electrode directly links to each other with the input end of the 3rd signal processing module by the 3rd inductor module, the input end of the 3rd signal processing module obtains one group of independence conductance signal from the 6th electrode, three groups of independence conductance signals are respectively through the first signal processing module, the secondary signal processing module, the current/voltage-converted of the 3rd signal processing module, rectification, filtering, after direct current amplify to be processed, by data collecting module collected in microcomputer;
4) three groups of independence conductance signals of microcomputer Storage and Processing, three groups of independence conductance signals have reflected the information of gas-liquid two-phase fluid gas phase content on the interior different directions of isolated pipe, three groups of independence conductance signals are through average treatment, the average conductance variable quantity that obtains can more effectively reflect the information that the gas-liquid two-phase flow containing rate changes, adopt the least-squares linear regression method, set up the gas-liquid two-phase flow containing rate and measured forecast model, obtained gas-liquid two-phase flow containing rate measured value according to forecast model.
The present invention compared with prior art has beneficial effect:
1) six electrode non-contact electric conductivity sensors can obtain reflecting three groups of independence conductance signals of gas-liquid two-phase flow containing rate information, three pairs of interelectrode electricity are led the more effective reflection gas-liquid two-phase flow containing rate change information of variable quantity energy, by means of electronic switching technology, only have pair of electrodes to have electric field in the moment of any detection, can avoid the electric field phase mutual interference between adjacent electrode;
2) the electronic switch control logic circuit is comprised of 555 timers, shift register ANDORNOTgate, can accurately produce successively closed required sequential pulse control sequential of three pairs of electronic switches, and this circuit does not need controller or additional decoding scheme, and is simple in structure;
3) metering system is contactless, electrode not with pipeline in fluid contact, so electrode is not subjected to fluid impact, burn into polarization, and the pressure loss is little, also can not affect flow characteristics, the flow field of tested two-phase fluid, be applicable to the measurement of gas-liquid two-phase flow containing rate;
4) adverse effect that coupling capacitance causes measurement range and resolution has been eliminated in the application of series resonance method;
Description of drawings
Fig. 1 is the structural representation of contactless electric gas-liquid guide two-phase flow phase content measurement mechanism;
Fig. 2 is six electrode non-contact electric conductivity sensors equivalence circuit diagram of the present invention;
Fig. 3 is six electrode non-contact electric conductivity sensors of the present invention equivalent circuit diagram and principle of work schematic diagram when the series resonance state;
Among the figure: ac-excited source 1, the first inductor module 2, the first electronic switch 3, the second electronic switch 4, the 3rd electronic switch 5, isolated pipe 6, the first electrode 7, the second electrode 8, third electrode 9, the 4th electrode 10, the 5th electrode 11, the 6th electrode 12, quadrielectron switch 13, the 5th electronic switch 14, the 6th electronic switch 15, electronic switch control logic circuit 16, first signal processing module 17, secondary signal processing module 18, the 3rd signal processing module 19, data acquisition module 20, microcomputer 21, the second inductor module 22, the 3rd inductor module 23.
Embodiment
As shown in Figure 1, non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism comprises ac-excited source 1, the first inductor module 2, the first electronic switch 3, the second electronic switch 4, the 3rd electronic switch 5, isolated pipe 6, the first electrode 7, the second electrode 8, third electrode 9, the 4th electrode 10, the 5th electrode 11, the 6th electrode 12, quadrielectron switch 13, the 5th electronic switch 14, the 6th electronic switch 15, electronic switch control logic circuit 16, first signal processing module 17, secondary signal processing module 18, the 3rd signal processing module 19, data acquisition module 20, microcomputer 21, the second inductor module 22, the 3rd inductor module 23; The first electrode 7, the second electrode 8, third electrode 9, the 4th electrode 10, the 5th electrode 11, the 6th electrode 12 is evenly distributed on around isolated pipe 6 outer walls, the first electrode 7 links to each other with an end of the second electronic switch 4, the second electrode 8 links to each other with an end of the first inductor module 2, third electrode 9 links to each other with an end of the 3rd electronic switch 5, the 4th electrode 10 links to each other with an end of the second inductor module 22, the 5th electrode 11 links to each other with an end of the first electronic switch 3, the 6th electrode 12 links to each other with an end of the 3rd inductor module 23, the other end of the first electronic switch 3, the other end of the second electronic switch 4, the other end of the 3rd electronic switch 5 links to each other with ac-excited source 1 respectively, the other end of the first inductor module 2 links to each other with an end of quadrielectron switch 13, the other end of the second inductor module 22 links to each other with the 5th electronic switch 14 1 ends, the other end of the 3rd inductor module 23 links to each other with the 6th electronic switch 15 1 ends, the other end of quadrielectron switch 13 links to each other with the input end of first signal processing module 17, the other end of the 5th electronic switch 14 links to each other with the input end of secondary signal processing module 18, the other end of the 6th electronic switch 15 links to each other with the input end of the 3rd signal processing module 19, the control end of the first electronic switch 3, the control end of quadrielectron switch 13 links to each other with the first output terminal of electronic switch control logic circuit 16, the control end of the second electronic switch 4, the control end of the 5th electronic switch 14 links to each other with the second output terminal of electronic switch control logic circuit 16, the control end of the 3rd electronic switch 5, the control end of the 6th electronic switch 15 links to each other with the 3rd output terminal of electronic switch control logic circuit 16, the output terminal of first signal processing module 17 links to each other with the first input end of data acquisition module 20, the output terminal of secondary signal processing module 18 links to each other with the second input end of data acquisition module 20, the output terminal of the 3rd signal processing module 19 links to each other with the 3rd input end of data acquisition module 20, and the output terminal of data acquisition module 20 links to each other with microcomputer 21; The first electrode 7, third electrode 9, the 5th electrode 11 are exciting electrode, and the second electrode 8, the 4th electrode 10, the 6th electrode 12 are detecting electrode.
The step of non-contact electric conductivity gas-liquid two-phase flow containing rate measuring method is as follows:
1) six electrode non-contact electric conductivity sensors are comprised of six electrodes that are evenly distributed on the isolated pipe 6 outer tube wall circumference, six electronic switches are divided into three pairs of electronic switches and realize three kinds of duties, three pairs of electronic switches are respectively: the first electronic switch 3 and quadrielectron switch 13, the second electronic switch 4 and the 5th electronic switch 14, the 3rd electronic switch 5 and the 6th electronic switch 15, electronic switch control logic circuit 16 is by 555 timer U
1(NE555), shift register U
2(CD4015), rejection gate U
3(74HC02) form, the sequential pulse sequential that electronic switch control logic circuit 16 produces is used for successively switch operating state of three pairs of electronic switches of control, so that three pairs of electronic switches are in closure state successively, when the first electronic switch 3 and quadrielectron switch 13 are in closure state, the second electronic switch 4, the 5th electronic switch 14, the 3rd electronic switch 5, the 6th electronic switch 15 disconnects, when the second electronic switch 4, when the 5th electronic switch 14 is in closure state, the first electronic switch 3, quadrielectron switch 13, the 3rd electronic switch 5, the 6th electronic switch 15 disconnects, when the 3rd electronic switch 5, when the 6th electronic switch 15 is in closure state, the first electronic switch 3, quadrielectron switch 13, the second electronic switch 4, the 5th electronic switch 14 disconnects;
2) excitation frequency that ac-excited source 1 is set is f, and output voltage is U
InWhen the first electronic switch 3 and quadrielectron switch 13 are in closure state, the second electronic switch 4, the 5th electronic switch 14, the 3rd electronic switch 5, the 6th electronic switch 15 disconnect, form article one alternating current path by ac-excited source 1, the first electronic switch 3, the 5th electrode 11, isolated pipe 6, the second electrode 8, the first inductor module 2, quadrielectron switch 13, the equivalent electrical circuit impedance of article one alternating current path is
Wherein, L
1Be the inductance of the first inductor module 2, the first coupling capacitance C
1Be the coupling capacitance that the 5th electrode 11, isolated pipe 6 and pipeline inner fluid form, the second coupling capacitance C
2Be the coupling capacitance that the second electrode 8, isolated pipe 6 and pipeline inner fluid form, first fluid equivalent resistance R
X1Be the equivalent resistance of the fluid of 8 at the 5th electrode 11 and the second electrode, the excitation frequency when ac-excited source 1 is
The time, article one, alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of article one alternating current path is zero, article one, the equivalent electrical circuit resulting impedance of alternating current path is pure resistive, when the second electronic switch 4, when the 5th electronic switch 14 is in closure state, the first electronic switch 3, quadrielectron switch 13, the 3rd electronic switch 5, the 6th electronic switch 15 disconnects, by ac-excited source 1, the second electronic switch 4, the first electrode 7, isolated pipe 6, the 4th electrode 10, the second inductor module 22, the 5th electronic switch 14 forms the second alternating current path, and the equivalent electrical circuit impedance of second alternating current path is
Wherein, L
2Be the inductance of the second inductor module 22, the 3rd coupling capacitance C
3Be the coupling capacitance that the first electrode 7, isolated pipe 6 and pipeline inner fluid form, the 4th coupling capacitance C
4Be the coupling capacitance that the 4th electrode 10, isolated pipe 6 and pipeline inner fluid form, second fluid equivalent resistance R
X2Be the equivalent resistance of the fluid of 10 at the first electrode 7 and the 4th electrode, the excitation frequency when ac-excited source 1 is
The time, the second alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of second alternating current path is zero, the equivalent electrical circuit resulting impedance of second alternating current path is pure resistive, when the 3rd electronic switch 5, when the 6th electronic switch 15 is in closure state, the first electronic switch 3, quadrielectron switch 13, the second electronic switch 4, the 5th electronic switch 14 disconnects, by ac-excited source 1, the 3rd electronic switch 5, third electrode 9, isolated pipe 6, the 6th electrode 12, the 3rd inductor module 23, the 6th electronic switch 15 forms the 3rd alternating current path, and the equivalent electrical circuit impedance of the 3rd alternating current path is
Wherein, L
3Be the inductance of the 3rd inductor module 23, the 5th coupling capacitance C
5Be the coupling capacitance that third electrode 9, isolated pipe 6 and pipeline inner fluid form, the 6th coupling capacitance C
6Be the coupling capacitance that the 6th electrode 12, isolated pipe 6 and pipeline inner fluid form, the 3rd fluid equivalent resistance R
X3Be the equivalent resistance of the fluid of 12 at third electrode 9 and the 6th electrode, the excitation frequency when ac-excited source 1 is
The time, the 3rd alternating current path is in the series resonance state, and then the equivalent electrical circuit imaginary impedance of the 3rd alternating current path is zero, and the equivalent electrical circuit resulting impedance of the 3rd alternating current path is pure resistive;
3) under the series resonance state, article one, the equivalent electrical circuit of alternating current path, the equivalent electrical circuit of second alternating current path, article three, the equivalent electrical circuit of alternating current path becomes pure resistive, under the sequential pulse sequential control effect that electronic switch control logic circuit 16 produces, when the first electronic switch 3 and quadrielectron switch 13 are in closure state, the second electrode 8 directly links to each other with the input end of first signal processing module 17 by the first inductor module 2, the input end of first signal processing module 17 obtains one group of independence conductance signal from the second electrode 8, when the second electronic switch 4 and the 5th electronic switch 14 are in closure state, the 4th electrode 10 directly links to each other with the input end of secondary signal processing module 18 by the second inductor module 22, the input end of secondary signal processing module 18 obtains one group of independence conductance signal from the 4th electrode 10, when the 3rd electronic switch 5 and the 6th electronic switch 15 are in closure state, the 6th electrode 12 directly links to each other with the input end of the 3rd signal processing module 19 by the 3rd inductor module 23, the input end of the 3rd signal processing module 19 obtains one group of independence conductance signal from the 6th electrode 12, three groups of independence conductance signals are respectively through first signal processing module 17, secondary signal processing module 18, the current/voltage-converted of the 3rd signal processing module 19, rectification, filtering, direct current is collected in the microcomputer 21 by data acquisition module 20 after amplifying processing;
4) three groups of independence conductance signals of microcomputer 21 Storage and Processings, three groups of independence conductance signals have reflected the information of gas-liquid two-phase fluid gas phase content on the isolated pipe 6 interior different directions, three groups of independence conductance signals are through average treatment, the average conductance variable quantity that obtains can more effectively reflect the information that the gas-liquid two-phase flow containing rate changes, adopt the least-squares linear regression method, set up the gas-liquid two-phase flow containing rate and measured forecast model, obtained gas-liquid two-phase flow containing rate measured value according to forecast model.
Utilized laminar flow common in the biphase gas and liquid flow on the horizontal glass pipeline to the present invention in mentioned apparatus and method carried out preliminary test, verified feasibility of the present invention, wherein horizontal glass pipeline internal diameter is 12.2mm, and test medium is air and tap water.Test findings shows: utilize apparatus and method mentioned among the present invention, can realize the measurement of gas-liquid two-phase flow containing rate, and can obtain preferably measurement result.
Claims (2)
1. a non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism is characterized in that comprising ac-excited source (1), the first inductor module (2), the first electronic switch (3), the second electronic switch (4), the 3rd electronic switch (5), isolated pipe (6), the first electrode (7), the second electrode (8), third electrode (9), the 4th electrode (10), the 5th electrode (11), the 6th electrode (12), quadrielectron switch (13), the 5th electronic switch (14), the 6th electronic switch (15), electronic switch control logic circuit (16), first signal processing module (17), secondary signal processing module (18), the 3rd signal processing module (19), data acquisition module (20), microcomputer (21), the second inductor module (22), the 3rd inductor module (23); The first electrode (7), the second electrode (8), third electrode (9), the 4th electrode (10), the 5th electrode (11), the 6th electrode (12) is evenly distributed on around isolated pipe (6) outer wall, the first electrode (7) links to each other with an end of the second electronic switch (4), the second electrode (8) links to each other with an end of the first inductor module (2), third electrode (9) links to each other with an end of the 3rd electronic switch (5), the 4th electrode (10) links to each other with an end of the second inductor module (22), the 5th electrode (11) links to each other with an end of the first electronic switch (3), the 6th electrode (12) links to each other with an end of the 3rd inductor module (23), the other end of the first electronic switch (3), the other end of the second electronic switch (4), the other end of the 3rd electronic switch (5) links to each other with ac-excited source (1) respectively, the other end of the first inductor module (2) links to each other with an end of quadrielectron switch (13), the other end of the second inductor module (22) links to each other with the 5th electronic switch (14) one ends, the other end of the 3rd inductor module (23) links to each other with the 6th electronic switch (15) one ends, the other end of quadrielectron switch (13) links to each other with the input end of first signal processing module (17), the other end of the 5th electronic switch (14) links to each other with the input end of secondary signal processing module (18), the other end of the 6th electronic switch (15) links to each other with the input end of the 3rd signal processing module (19), the control end of the first electronic switch (3), the control end of quadrielectron switch (13) links to each other with the first output terminal of electronic switch control logic circuit (16), the control end of the second electronic switch (4), the control end of the 5th electronic switch (14) links to each other with the second output terminal of electronic switch control logic circuit (16), the control end of the 3rd electronic switch (5), the control end of the 6th electronic switch (15) links to each other with the 3rd output terminal of electronic switch control logic circuit (16), the output terminal of first signal processing module (17) links to each other with the first input end of data acquisition module (20), the output terminal of secondary signal processing module (18) links to each other with the second input end of data acquisition module (20), the output terminal of the 3rd signal processing module (19) links to each other with the 3rd input end of data acquisition module (20), and the output terminal of data acquisition module (20) links to each other with microcomputer (21); The first electrode (7), third electrode (9), the 5th electrode (11) are exciting electrode, and the second electrode (8), the 4th electrode (10), the 6th electrode (12) are detecting electrode.
2. non-contact electric conductivity gas-liquid two-phase flow containing rate measuring method that use is installed as claimed in claim 1 is characterized in that its step is as follows:
1) six electrode non-contact electric conductivity sensors are comprised of six electrodes that are evenly distributed on isolated pipe (6) the outer tube wall circumference, six electronic switches are divided into three pairs of electronic switches and realize three kinds of duties, three pairs of electronic switches are respectively: the first electronic switch (3) and quadrielectron switch (13), the second electronic switch (4) and the 5th electronic switch (14), the 3rd electronic switch (5) and the 6th electronic switch (15), electronic switch control logic circuit (16) is by 555 timer (U
1), shift register (U
2), rejection gate (U
3) form, the sequential pulse sequential that electronic switch control logic circuit (16) produces is used for successively switch operating state of three pairs of electronic switches of control, so that three pairs of electronic switches are in closure state successively, when the first electronic switch (3) and quadrielectron switch (13) when being in closure state, the second electronic switch (4), the 5th electronic switch (14), the 3rd electronic switch (5), the 6th electronic switch (15) disconnects, when the second electronic switch (4), the 5th electronic switch (14) is when being in closure state, the first electronic switch (3), quadrielectron switch (13), the 3rd electronic switch (5), the 6th electronic switch (15) disconnects, when the 3rd electronic switch (5), the 6th electronic switch (15) is when being in closure state, the first electronic switch (3), quadrielectron switch (13), the second electronic switch (4), the 5th electronic switch (14) disconnects;
2) excitation frequency that ac-excited source (1) is set is f, and output voltage is U
InWhen the first electronic switch (3) and quadrielectron switch (13) when being in closure state, the second electronic switch (4), the 5th electronic switch (14), the 3rd electronic switch (5), the 6th electronic switch (15) disconnect, form article one alternating current path by ac-excited source (1), the first electronic switch (3), the 5th electrode (11), isolated pipe (6), the second electrode (8), the first inductor module (2), quadrielectron switch (13), the equivalent electrical circuit impedance of article one alternating current path is
Wherein, L
1Be the inductance of the first inductor module (2), the first coupling capacitance C
1Be the coupling capacitance that the 5th electrode (11), isolated pipe (6) and pipeline inner fluid form, the second coupling capacitance C
2Be the coupling capacitance that the second electrode (8), isolated pipe (6) and pipeline inner fluid form, first fluid equivalent resistance R
X1Be the equivalent resistance of the fluid between the 5th electrode (11) and the second electrode (8), the excitation frequency when ac-excited source (1) is
The time, article one, alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of article one alternating current path is zero, article one, the equivalent electrical circuit resulting impedance of alternating current path is pure resistive, when the second electronic switch (4), the 5th electronic switch (14) is when being in closure state, the first electronic switch (3), quadrielectron switch (13), the 3rd electronic switch (5), the 6th electronic switch (15) disconnects, by ac-excited source (1), the second electronic switch (4), the first electrode (7), isolated pipe (6), the 4th electrode (10), the second inductor module (22), the 5th electronic switch (14) forms the second alternating current path, and the equivalent electrical circuit impedance of second alternating current path is
Wherein, L
2Be the inductance of the second inductor module (22), the 3rd coupling capacitance C
3Be the coupling capacitance that the first electrode (7), isolated pipe (6) and pipeline inner fluid form, the 4th coupling capacitance C
4Be the coupling capacitance that the 4th electrode (10), isolated pipe (6) and pipeline inner fluid form, second fluid equivalent resistance R
X2Be the equivalent resistance of the fluid between the first electrode (7) and the 4th electrode (10), the excitation frequency when ac-excited source (1) is
The time, the second alternating current path is in the series resonance state, then the equivalent electrical circuit imaginary impedance of second alternating current path is zero, the equivalent electrical circuit resulting impedance of second alternating current path is pure resistive, when the 3rd electronic switch (5), the 6th electronic switch (15) is when being in closure state, the first electronic switch (3), quadrielectron switch (13), the second electronic switch (4), the 5th electronic switch (14) disconnects, by ac-excited source (1), the 3rd electronic switch (5), third electrode (9), isolated pipe (6), the 6th electrode (12), the 3rd inductor module (23), the 6th electronic switch (15) forms the 3rd alternating current path, and the equivalent electrical circuit impedance of the 3rd alternating current path is
Wherein, L
3Be the inductance of the 3rd inductor module (23), the 5th coupling capacitance C
5Be the coupling capacitance that third electrode (9), isolated pipe (6) and pipeline inner fluid form, the 6th coupling capacitance C
6Be the coupling capacitance that the 6th electrode (12), isolated pipe (6) and pipeline inner fluid form, the 3rd fluid equivalent resistance R
X3Be the equivalent resistance of the fluid between third electrode (9) and the 6th electrode (12), the excitation frequency when ac-excited source (1) is
The time, the 3rd alternating current path is in the series resonance state, and then the equivalent electrical circuit imaginary impedance of the 3rd alternating current path is zero, and the equivalent electrical circuit resulting impedance of the 3rd alternating current path is pure resistive;
3) under the series resonance state, article one, the equivalent electrical circuit of alternating current path, the equivalent electrical circuit of second alternating current path, article three, the equivalent electrical circuit of alternating current path becomes pure resistive, under the sequential pulse sequential control effect that electronic switch control logic circuit (16) produces, when the first electronic switch (3) and quadrielectron switch (13) are in closure state, the second electrode (8) directly links to each other with the input end of first signal processing module (17) by the first inductor module (2), the input end of first signal processing module (17) obtains one group of independence conductance signal from the second electrode (8), when the second electronic switch (4) and the 5th electronic switch (14) are in closure state, the 4th electrode (10) directly links to each other with the input end of secondary signal processing module (18) by the second inductor module (22), the input end of secondary signal processing module (18) obtains one group of independence conductance signal from the 4th electrode (10), when the 3rd electronic switch (5) and the 6th electronic switch (15) are in closure state, the 6th electrode (12) directly links to each other with the input end of the 3rd signal processing module (19) by the 3rd inductor module (23), the input end of the 3rd signal processing module (19) obtains one group of independence conductance signal from the 6th electrode (12), three groups of independence conductance signals are respectively through first signal processing module (17), secondary signal processing module (18), the current/voltage-converted of the 3rd signal processing module (19), rectification, filtering, direct current is collected in the microcomputer (21) by data acquisition module (20) after amplifying processing;
4) three groups of independence conductance signals of microcomputer (21) Storage and Processing, three groups of independence conductance signals have reflected the information of gas-liquid two-phase fluid gas phase content on the interior different directions of isolated pipe (6), three groups of independence conductance signals are through average treatment, the average conductance variable quantity that obtains can more effectively reflect the information that the gas-liquid two-phase flow containing rate changes, adopt the least-squares linear regression method, set up the gas-liquid two-phase flow containing rate and measured forecast model, obtained gas-liquid two-phase flow containing rate measured value according to forecast model.
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