CN103018285B - Non-contact type conductive measurement device and method for phase content of gas-liquid two-phase flow - Google Patents

Abstract

The invention discloses a non-contact electrical conductivity gas-liquid two-phase flow phase holdup measurement device and method. It includes an AC excitation source, an insulating pipeline, six electrodes, an inductance module, an electronic switch, an electronic switch control logic circuit, a signal processing module, a data acquisition module and a microcomputer. The invention develops a six-electrode non-contact conductance sensor, which realizes the use of the six-electrode non-contact conductance sensor for the measurement of gas-liquid two-phase fluid phase holdup. The invention is a new type of non-contact conductometric measurement technology suitable for the continuous phase of the gas-liquid two-phase fluid as the conductive liquid. It avoids the problems of electrode polarization and electrochemical corrosion existing in the traditional contact conductivity measurement method, and overcomes the influence of flow pattern changes on the phase holdup measurement to a certain extent, and provides a new method for the phase holdup measurement of gas-liquid two-phase fluids. Effective new way.

Description

A non-contact electrical conductivity gas-liquid two-phase flow phase holdup measurement device and method

technical field

The invention relates to a gas-liquid two-phase flow phase holdup measurement technology, in particular to a non-contact electrical conductivity gas-liquid two-phase flow phase holdup measurement device and method.

Background technique

Gas-liquid two-phase flow widely exists in many industrial processes such as petroleum, chemical industry, energy, and power. Phase holdup is one of the important parameters to characterize the characteristics of gas-liquid two-phase flow. Its online measurement plays an important role in the state monitoring, real-time control, safe operation, energy saving and efficiency enhancement of the two-phase flow system. Although there are many phase holdup measurement methods at present, due to the complexity of gas-liquid two-phase flow, the existing detection methods have not yet met the actual application requirements in industry, and the online measurement method of phase holdup still needs further research. research Development.

In the field of two-phase flow parameter measurement, the phase holdup measurement of gas-liquid two-phase flow based on conductance and capacitance detection is the main aspect of the two-phase flow research field. At present, a variety of conductivity detection techniques have been applied to the measurement of phase holdup in two-phase fluids. However, the existing conductivity detection technology is mainly a contact conductivity measurement method, which is mainly used for the gas-liquid two-phase pipe flow where the gas-liquid two-phase fluid conducts continuous phase. If the measurement fluid is in direct contact, problems such as electrode polarization and electrochemical corrosion are prone to occur, which has a certain impact on the measurement, and its practical application is also limited. The electrodes of the gas-liquid two-phase flow holdup sensor based on capacitance detection are installed around the outer wall of the measured pipeline, and the electrodes can avoid contact with the measured fluid. However, the capacitance-based detection method is mainly used for the measurement of the continuous phase of the gas-liquid two-phase fluid as a non-conductive liquid.

Capacitive coupling non-contact conductivity measurement technology is a new type of non-contact conductivity measurement technology. Its electrodes are not in direct contact with the fluid, which effectively avoids the problems of electrode polarization and electrochemical corrosion in the traditional contact conductometric measurement method, and has the advantages of simple structure and good robustness. However, at present, the research and application of this technology are mainly limited to the measurement of the conductance and ion concentration of the capillary or below-diameter solution in the field of analytical chemistry, etc., and the application in the measurement of gas-liquid two-phase flow phase holdup is still in its infancy. There are relatively few reports.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a feasible and effective non-contact electrical conductivity gas-liquid two-phase flow phase holdup measurement device and method.

The non-contact conductance gas-liquid two-phase flow holdup measurement device includes an AC excitation source, a first inductance module, a first electronic switch, a second electronic switch, a third electronic switch, an insulating pipe, a first electrode, a second electrode, The third electrode, the fourth electrode, the fifth electrode, the sixth electrode, the fourth electronic switch, the fifth electronic switch, the sixth electronic switch, the electronic switch control logic circuit, the first signal processing module, the second signal processing module, the sixth electronic switch Three signal processing module, data acquisition module, microcomputer, second inductance module, third inductance module; first electrode, second electrode, third electrode, fourth electrode, fifth electrode, sixth electrode are evenly distributed in the insulating pipeline Around the outer wall, the first electrode is connected to one end of the second electronic switch, the second electrode is connected to one end of the first inductance module, the third electrode is connected to one end of the third electronic switch, and the fourth electrode is connected to one end of the second inductance module , the fifth electrode is connected to one end of the first electronic switch, the sixth electrode is connected to one end of the third inductance module, the other end of the first electronic switch, the other end of the second electronic switch, and the other end of the third electronic switch are respectively connected to the The AC excitation source is connected, the other end of the first inductance module is connected to one end of the fourth electronic switch, the other end of the second inductance module is connected to one end of the fifth electronic switch, and the other end of the third inductance module is connected to one end of the sixth electronic switch , the other end of the fourth electronic switch is connected to the input end of the first signal processing module, the other end of the fifth electronic switch is connected to the input end of the second signal processing module, the other end of the sixth electronic switch is connected to the third signal processing module The input terminal of the first electronic switch and the control terminal of the fourth electronic switch are connected with the first output terminal of the electronic switch control logic circuit, the control terminal of the second electronic switch and the control terminal of the fifth electronic switch are connected with the electronic The second output terminal of the switch control logic circuit is connected, the control terminal of the third electronic switch and the control terminal of the sixth electronic switch are connected with the third output terminal of the electronic switch control logic circuit, and the output terminal of the first signal processing module is connected with the data acquisition terminal. The first input end of the module is connected, the output end of the second signal processing module is connected with the second input end of the data acquisition module, the output end of the third signal processing module is connected with the third input end of the data acquisition module, and the output end of the data acquisition module The output end is connected with the microcomputer; the first electrode, the third electrode, and the fifth electrode are excitation electrodes, and the second electrode, fourth electrode, and sixth electrode are detection electrodes.

The steps of the non-contact conductance gas-liquid two-phase flow phase holdup measurement method are as follows:

1) The six-electrode non-contact conductivity sensor is composed of six electrodes evenly distributed on the circumference of the outer wall of the insulating pipe. The six electronic switches are divided into three pairs of electronic switches to achieve three working states. The three pairs of electronic switches are: One electronic switch and the fourth electronic switch, the second electronic switch and the fifth electronic switch, the third electronic switch and the sixth electronic switch, the electronic switch control logic circuit is composed of a 555 timer, a shift register, and a NOR gate, and the electronic switch The sequential pulse timing generated by the control logic circuit is used to control the three pairs of electronic switches to switch their working states sequentially, so that the three pairs of electronic switches are in the closed state in sequence. When the first electronic switch and the fourth electronic switch are in the closed state, the second electronic switch, The fifth electronic switch, the third electronic switch, and the sixth electronic switch are disconnected. When the second electronic switch and the fifth electronic switch are in the closed state, the first electronic switch, the fourth electronic switch, the third electronic switch, and the sixth electronic switch The switch is turned off, and when the third electronic switch and the sixth electronic switch are in a closed state, the first electronic switch, the fourth electronic switch, the second electronic switch, and the fifth electronic switch are turned off;

2) Set the excitation frequency of the AC excitation source as f, the output voltage as U _in , when the first electronic switch and the fourth electronic switch are in the closed state, the second electronic switch, the fifth electronic switch, the third electronic switch, the sixth electronic switch The electronic switch is turned off, and the first AC path is formed by the AC excitation source, the first electronic switch, the fifth electrode, the insulating pipe, the second electrode, the first inductance module, and the fourth electronic switch. The equivalent of the first AC path The circuit impedance is Among them, L ₁ is the inductance of the first inductance module, the first coupling capacitance C ₁ is the coupling capacitance formed by the fifth electrode, the insulating pipeline and the fluid in the pipeline, and the second coupling capacitance C ₂ is the coupling capacitance formed by the second electrode, the insulating pipeline and the fluid in the pipeline. The coupling capacitance formed by the fluid, the first fluid equivalent resistance R _x1 is the equivalent resistance of the fluid between the fifth electrode and the second electrode, when the excitation frequency of the AC excitation source is When the first AC path is in the state of series resonance, the imaginary part of the equivalent circuit impedance of the first AC path is zero, and the total impedance of the equivalent circuit of the first AC path is purely resistive. When the second electronic switch, When the fifth electronic switch is in the closed state, the first electronic switch, the fourth electronic switch, the third electronic switch, and the sixth electronic switch are disconnected, and the AC excitation source, the second electronic switch, the first electrode, the insulating pipe, and the fourth electronic switch are turned off. The electrode, the second inductance module, and the fifth electronic switch form the second AC path, and the equivalent circuit impedance of the second AC path is Among them, L ₂ is the inductance of the second inductance module, the third coupling capacitance C ₃ is the coupling capacitance formed by the first electrode, the insulating pipeline and the fluid in the pipeline, and the fourth coupling capacitance C ₄ is the coupling capacitance formed by the fourth electrode, the insulating pipeline and the fluid in the pipeline. The coupling capacitance formed by the fluid, the second fluid equivalent resistance R _x2 is the equivalent resistance of the fluid between the first electrode and the fourth electrode, when the excitation frequency of the AC excitation source is When the second AC path is in the state of series resonance, the imaginary part of the equivalent circuit impedance of the second AC path is zero, and the total impedance of the equivalent circuit of the second AC path is purely resistive. When the third electronic switch, When the sixth electronic switch is in the closed state, the first electronic switch, the fourth electronic switch, the second electronic switch and the fifth electronic switch are disconnected, and the AC excitation source, the third electronic switch, the third electrode, the insulating pipe, the sixth electronic switch The electrode, the third inductance module, and the sixth electronic switch form the third AC path, and the equivalent circuit impedance of the third AC path is Among them, L ₃ is the inductance of the third inductance module, the fifth coupling capacitance C ₅ is the coupling capacitance formed by the third electrode, the insulating pipeline and the fluid in the pipeline, and the sixth coupling capacitance C ₆ is the coupling capacitance formed by the sixth electrode, the insulating pipeline and the fluid in the pipeline. The coupling capacitance formed by the fluid, the third fluid equivalent resistance R _x3 is the equivalent resistance of the fluid between the third electrode and the sixth electrode, when the excitation frequency of the AC excitation source is , the third AC path is in the state of series resonance, then the imaginary part of the equivalent circuit impedance of the third AC path is zero, and the total impedance of the equivalent circuit of the third AC path is purely resistive;

3) In the state of series resonance, the equivalent circuit of the first AC path, the equivalent circuit of the second AC path, and the equivalent circuit of the third AC path are purely resistive. Under the action of sequential pulse timing control, when the first electronic switch and the fourth electronic switch are in the closed state, the second electrode is directly connected to the input terminal of the first signal processing module through the first inductance module, and the input terminal of the first signal processing module is connected from The second electrode obtains a set of independent conductance signals. When the second electronic switch and the fifth electronic switch are in a closed state, the fourth electrode is directly connected to the input terminal of the second signal processing module through the second inductance module, and the second signal processing module The input terminal obtains a set of independent conductance signals from the fourth electrode. When the third electronic switch and the sixth electronic switch are in the closed state, the sixth electrode is directly connected to the input terminal of the third signal processing module through the third inductance module, and the third signal The input terminal of the processing module obtains a set of independent conductance signals from the sixth electrode, and the three sets of independent conductance signals are respectively subjected to current/voltage conversion, rectification, and filtering by the first signal processing module, the second signal processing module, and the third signal processing module , After DC amplification processing, it is collected by the data acquisition module into the microcomputer;

4) The microcomputer stores and processes three sets of independent conductance signals. The three sets of independent conductance signals reflect the information of the gas-phase holdup of the gas-liquid two-phase fluid in different directions in the insulating pipeline. After the average processing of the three sets of independent conductance signals, the average conductance The amount of change can more effectively reflect the change information of gas-liquid two-phase flow phase holdup. Using the least squares linear regression method, a gas-liquid two-phase flow phase holdup measurement and prediction model is established. According to the prediction model, the gas-liquid two-phase flow Phase holdup measurements.

Compared with the prior art, the present invention has beneficial effects:

1) The six-electrode non-contact conductivity sensor can obtain three sets of independent conductance signals reflecting the phase holdup information of the gas-liquid two-phase flow, and the conductance change between the three pairs of electrodes can more effectively reflect the phase holdup change of the gas-liquid two-phase flow Information, with the help of electronic switching technology, only one pair of electrodes has an electric field at any moment of detection, which can avoid mutual interference of electric fields between adjacent electrodes;

2) The electronic switch control logic circuit is composed of a 555 timer, a shift register and a NOR gate, which can accurately generate the sequential pulse control timing required for the sequential closing of three pairs of electronic switches. This circuit does not require a controller or an additional decoding circuit. Simple structure;

3) The measurement method is non-contact, the electrode is not in contact with the fluid in the pipeline, so the electrode is not affected by fluid impact, corrosion, polarization, and the pressure loss is small, and it will not affect the flow characteristics and flow field of the measured two-phase fluid , suitable for the measurement of phase holdup of gas-liquid two-phase flow;

4) The application of the series resonance method eliminates the adverse effects of the coupling capacitance on the measurement range and resolution;

Description of drawings

Fig. 1 is a schematic structural view of a non-contact conductance gas-liquid two-phase flow phase holdup measurement device;

Fig. 2 is an equivalent circuit diagram of a six-electrode non-contact conductivity sensor of the present invention;

3 is an equivalent circuit diagram and a schematic diagram of the working principle of the six-electrode non-contact conductivity sensor of the present invention in a series resonance state;

In the figure: AC excitation source 1, first inductance module 2, first electronic switch 3, second electronic switch 4, third electronic switch 5, insulating pipe 6, first electrode 7, second electrode 8, third electrode 9 , the fourth electrode 10, the fifth electrode 11, the sixth electrode 12, the fourth electronic switch 13, the fifth electronic switch 14, the sixth electronic switch 15, the electronic switch control logic circuit 16, the first signal processing module 17, the second A signal processing module 18 , a third signal processing module 19 , a data acquisition module 20 , a microcomputer 21 , a second inductance module 22 , and a third inductance module 23 .

Detailed ways

As shown in Figure 1, the non-contact conduction gas-liquid two-phase flow holdup measurement device includes an AC excitation source 1, a first inductance module 2, a first electronic switch 3, a second electronic switch 4, a third electronic switch 5, Insulated pipe 6, first electrode 7, second electrode 8, third electrode 9, fourth electrode 10, fifth electrode 11, sixth electrode 12, fourth electronic switch 13, fifth electronic switch 14, sixth electronic switch 15. Electronic switch control logic circuit 16, first signal processing module 17, second signal processing module 18, third signal processing module 19, data acquisition module 20, microcomputer 21, second inductance module 22, third inductance module 23 The first electrode 7, the second electrode 8, the third electrode 9, the fourth electrode 10, the fifth electrode 11, and the sixth electrode 12 are evenly distributed around the outer wall of the insulating pipeline 6, and the first electrode 7 and the second electronic switch 4 One end is connected, the second electrode 8 is connected with one end of the first inductance module 2, the third electrode 9 is connected with one end of the third electronic switch 5, the fourth electrode 10 is connected with one end of the second inductance module 22, and the fifth electrode 11 is connected with one end of the second inductance module 22. One end of the first electronic switch 3 is connected, the sixth electrode 12 is connected with one end of the third inductance module 23, the other end of the first electronic switch 3, the other end of the second electronic switch 4, and the other end of the third electronic switch 5 are respectively Connected to the AC excitation source 1, the other end of the first inductance module 2 is connected to one end of the fourth electronic switch 13, the other end of the second inductance module 22 is connected to one end of the fifth electronic switch 14, the other end of the third inductance module 23 One end of the sixth electronic switch 15 is connected, the other end of the fourth electronic switch 13 is connected with the input end of the first signal processing module 17, the other end of the fifth electronic switch 14 is connected with the input end of the second signal processing module 18, and the other end of the fourth electronic switch 13 is connected with the input end of the second signal processing module 18. The other end of the six electronic switch 15 is connected to the input end of the third signal processing module 19, the control end of the first electronic switch 3 and the control end of the fourth electronic switch 13 are connected to the first output end of the electronic switch control logic circuit 16, The control end of the second electronic switch 4, the control end of the fifth electronic switch 14 are connected with the second output end of the electronic switch control logic circuit 16, the control end of the third electronic switch 5, the control end of the sixth electronic switch 15 are connected with the electronic The third output end of the switch control logic circuit 16 is connected, the output end of the first signal processing module 17 is connected with the first input end of the data acquisition module 20, and the output end of the second signal processing module 18 is connected with the second input end of the data acquisition module 20. The input is connected, the output of the third signal processing module 19 is connected with the third input of the data acquisition module 20, and the output of the data acquisition module 20 is connected with the microcomputer 21; the first electrode 7, the third electrode 9, the fifth The electrode 11 is an excitation electrode, and the second electrode 8 , the fourth electrode 10 and the sixth electrode 12 are detection electrodes.

The steps of the non-contact conductance gas-liquid two-phase flow phase holdup measurement method are as follows:

1) The six-electrode non-contact conductivity sensor is composed of six electrodes evenly distributed on the circumference of the outer wall of the insulating pipe 6. The six electronic switches are divided into three pairs of electronic switches to achieve three working states. The three pairs of electronic switches are: The first electronic switch 3 and the fourth electronic switch 13, the second electronic switch 4 and the fifth electronic switch 14, the third electronic switch 5 and the sixth electronic switch 15, the electronic switch control logic circuit 16 is controlled by 555 timer U ₁ (NE555 ), a shift register U ₂ (CD4015), and a NOR gate U ₃ (74HC02). The sequential pulse sequence generated by the electronic switch control logic circuit 16 is used to control the three pairs of electronic switches to switch their working states in turn, so that the three pairs of electronic switches are sequentially In the closed state, when the first electronic switch 3 and the fourth electronic switch 13 are in the closed state, the second electronic switch 4, the fifth electronic switch 14, the third electronic switch 5, and the sixth electronic switch 15 are disconnected. When the electronic switch 4 and the fifth electronic switch 14 were in the closed state, the first electronic switch 3, the fourth electronic switch 13, the third electronic switch 5, and the sixth electronic switch 15 were disconnected; when the third electronic switch 5, the sixth electronic switch When the switch 15 is in the closed state, the first electronic switch 3, the fourth electronic switch 13, the second electronic switch 4, and the fifth electronic switch 14 are disconnected;

2) Set the excitation frequency of the AC excitation source 1 as f, and the output voltage as U _in , when the first electronic switch 3 and the fourth electronic switch 13 are in the closed state, the second electronic switch 4, the fifth electronic switch 14, the third electronic switch The electronic switch 5 and the sixth electronic switch 15 are disconnected, and are formed by the AC excitation source 1, the first electronic switch 3, the fifth electrode 11, the insulating pipe 6, the second electrode 8, the first inductance module 2, and the fourth electronic switch 13 The first AC path, the equivalent circuit impedance of the first AC path is Wherein, _L1 is the inductance of the first inductance module 2, the first coupling capacitance _C1 is the coupling capacitance formed by the fifth electrode 11, the insulating pipeline 6 and the fluid in the pipeline, and the second coupling capacitance _C2 is the second electrode 8, the insulating The coupling capacitance formed by the pipeline 6 and the fluid in the pipeline, the first fluid equivalent resistance R _x1 is the equivalent resistance of the fluid between the fifth electrode 11 and the second electrode 8, when the excitation frequency of the AC excitation source 1 is , the first AC path is in the state of series resonance, the imaginary part of the equivalent circuit impedance of the first AC path is zero, and the total impedance of the equivalent circuit of the first AC path is purely resistive. When the second electronic switch 4 1. When the fifth electronic switch 14 is in the closed state, the first electronic switch 3, the fourth electronic switch 13, the third electronic switch 5, and the sixth electronic switch 15 are disconnected, and the AC excitation source 1, the second electronic switch 4, the The first electrode 7, the insulating pipe 6, the fourth electrode 10, the second inductance module 22, and the fifth electronic switch 14 form a second AC path, and the equivalent circuit impedance of the second AC path is Wherein, L ₂ is the inductance of the second inductance module 22, the third coupling capacitance C ₃ is the coupling capacitance formed by the first electrode 7, the insulating pipeline 6 and the fluid in the pipeline, and the fourth coupling capacitance C ₄ is the fourth electrode 10, the insulating The coupling capacitance formed by the pipeline 6 and the fluid in the pipeline, the second fluid equivalent resistance R _x2 is the equivalent resistance of the fluid between the first electrode 7 and the fourth electrode 10, when the excitation frequency of the AC excitation source 1 is , the second AC path is in the state of series resonance, the imaginary part of the equivalent circuit impedance of the second AC path is zero, and the total impedance of the equivalent circuit of the second AC path is purely resistive. When the third electronic switch 5 1. When the sixth electronic switch 15 is in the closed state, the first electronic switch 3, the fourth electronic switch 13, the second electronic switch 4, and the fifth electronic switch 14 are disconnected, and the AC excitation source 1, the third electronic switch 5, the The three electrodes 9, the insulating pipe 6, the sixth electrode 12, the third inductance module 23, and the sixth electronic switch 15 form a third AC path, and the equivalent circuit impedance of the third AC path is Wherein, L ₃ is the inductance of the third inductance module 23, the fifth coupling capacitance C ₅ is the coupling capacitance formed by the third electrode 9, the insulating pipeline 6 and the fluid in the pipeline, and the sixth coupling capacitance C ₆ is the sixth electrode 12, the insulating The coupling capacitance formed by the pipeline 6 and the fluid in the pipeline, the third fluid equivalent resistance R _x3 is the equivalent resistance of the fluid between the third electrode 9 and the sixth electrode 12, when the excitation frequency of the AC excitation source 1 is , the third AC path is in the state of series resonance, then the imaginary part of the equivalent circuit impedance of the third AC path is zero, and the total impedance of the equivalent circuit of the third AC path is purely resistive;

3) In the state of series resonance, the equivalent circuit of the first AC path, the equivalent circuit of the second AC path, and the equivalent circuit of the third AC path are purely resistive, which is generated in the electronic switch control logic circuit 16 Under the action of sequential pulse timing control, when the first electronic switch 3 and the fourth electronic switch 13 are in the closed state, the second electrode 8 is directly connected to the input terminal of the first signal processing module 17 through the first inductance module 2, and the first signal The input terminal of the processing module 17 obtains a set of independent conductance signals from the second electrode 8. When the second electronic switch 4 and the fifth electronic switch 14 are in the closed state, the fourth electrode 10 is directly processed with the second signal through the second inductance module 22. The input terminals of the module 18 are connected, and the input terminal of the second signal processing module 18 obtains a set of independent conductance signals from the fourth electrode 10. When the third electronic switch 5 and the sixth electronic switch 15 are in a closed state, the sixth electrode 12 passes through the fourth electrode 10. The three-inductance module 23 is directly connected to the input end of the third signal processing module 19, and the input end of the third signal processing module 19 obtains a set of independent conductance signals from the sixth electrode 12, and the three sets of independent conductance signals are respectively processed by the first signal After the current/voltage conversion, rectification, filtering, and DC amplification processing of the module 17, the second signal processing module 18, and the third signal processing module 19, the data acquisition module 20 collects in the microcomputer 21;

4) The microcomputer 21 stores and processes three sets of independent conductance signals. The three sets of independent conductance signals reflect the information of the gas-phase holdup of the gas-liquid two-phase fluid in different directions in the insulating pipeline 6. The three sets of independent conductance signals are averaged to obtain The average conductance change can more effectively reflect the change information of the gas-liquid two-phase flow phase holdup. Using the least squares linear regression method, a gas-liquid two-phase flow phase holdup measurement and prediction model was established. According to the prediction model, the gas-liquid two-phase Phase flow phase holdup measurements.

Utilize the common laminar flow in the gas-liquid two-phase flow to carry out preliminary test to the device and method mentioned in the present invention on the horizontal glass pipe, verify the feasibility of the present invention, wherein the inner diameter of the horizontal glass pipe is 12.2mm, The experimental media were air and tap water. The test results show that: using the device and method mentioned in the present invention, the measurement of the gas-liquid two-phase flow phase holdup can be realized, and better measurement results can be obtained.

Claims (2)

1. a non-contact electric conductivity gas-liquid two-phase flow containing rate measurement mechanism, it 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) is connected with one end of the second electronic switch (4), the second electrode (8) is connected with one end of the first inductor module (2), third electrode (9) is connected with one end of the 3rd electronic switch (5), the 4th electrode (10) is connected with one end of the second inductor module (22), the 5th electrode (11) is connected with one end of the first electronic switch (3), the 6th electrode (12) is connected with one 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) is connected with ac-excited source (1) respectively, the other end of the first inductor module (2) is connected with one end of quadrielectron switch (13), the other end of the second inductor module (22) is connected with the 5th electronic switch (14) one end, the other end of the 3rd inductor module (23) is connected with the 6th electronic switch (15) one end, the other end of quadrielectron switch (13) is connected with the input end of first signal processing module (17), the other end of the 5th electronic switch (14) is connected with the input end of secondary signal processing module (18), the other end of the 6th electronic switch (15) is connected 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) is connected 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) is connected 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) is connected with the 3rd output terminal of electronic switch control logic circuit (16), the output terminal of first signal processing module (17) is connected with the first input end of data acquisition module (20), the output terminal of secondary signal processing module (18) is connected with the second input end of data acquisition module (20), the output terminal of the 3rd signal processing module (19) is connected with the 3rd input end of data acquisition module (20), the output terminal of data acquisition module (20) is connected 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. the 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) 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 controlling three pairs of electronic switches switch operating state successively, make three pairs of electronic switches successively in closure state, when the first electronic switch (3) and quadrielectron switch (13) are during 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 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 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 during in closure state, the second electronic switch (4), the 5th electronic switch (14), the 3rd electronic switch (5), the 6th electronic switch (15) disconnect, 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), form article one alternating current path, 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 time, article one, alternating current path is in series resonance state, 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 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 second alternating current path, 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 time, second alternating current path is in series resonance state, 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 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, article three, the equivalent electrical circuit impedance of alternating current path is wherein, L ₃be the inductance of the 3rd inductor module (23), the 5th coupling capacitance C ₅for 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 _x3for the equivalent resistance of the fluid between third electrode (9) and the 6th electrode (12), the excitation frequency when ac-excited source (1) is time, the 3rd alternating current path is in series resonance state, and 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 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 producing at electronic switch control logic circuit (16), when the first electronic switch (3) and quadrielectron switch (13) are in closure state, the second electrode (8) is directly connected 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) is directly connected 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) is directly connected 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 amplifies after processing, by data acquisition module (20), collected in microcomputer (21),

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 obtaining can more effectively reflect the information that gas-liquid two-phase flow containing rate changes, adopt least-squares linear regression method, set up gas-liquid two-phase flow containing rate and measured forecast model, according to forecast model, obtained gas-liquid two-phase flow containing rate measured value.