CN1414382A - Detector of gas liquid two phase flow split-phase content based on resistance chromatographic imaging and method - Google Patents
Detector of gas liquid two phase flow split-phase content based on resistance chromatographic imaging and method Download PDFInfo
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- CN1414382A CN1414382A CN 02129062 CN02129062A CN1414382A CN 1414382 A CN1414382 A CN 1414382A CN 02129062 CN02129062 CN 02129062 CN 02129062 A CN02129062 A CN 02129062A CN 1414382 A CN1414382 A CN 1414382A
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Abstract
The invented detector for split-phase flow includes microcomputer, photoelectricity isolation bus, sensor, electrode drive, phase sensitivity demodulation unit, A/D converter, low pass filter and differential amplification, etc., these parts are connected in sequence. The invented method includes the following three steps: The computer calculates the data sampled by the sensor in the time intervals so as to obtain the VR values, and whether it is a laminar flow or a foam-like flow is judged. For the laminar flow, the split-phase content rate of the gas and liquid two phases can be obtained through calculating the Vr values. (3) For the foam-like flow, the split-phase content rate of the gas and liquid two phases can be obtained through calculating the VR values.
Description
Technical field
The invention belongs to the measurement class, relate in particular to the measurement mechanism and the measuring method of biphase gas and liquid flow.
Background technology
At present, known Electrical Resistance Tomography (ERT) technology is a kind of simplification situation of electrical impedance tomography (EIT) technology, has promptly only utilized real part (information of resistance).The physical basis of ERT technology is that different mediums have different conductivity, judge responsive the just medium of thing field distribution as can be known of distribution of conductivity.The working method that adopts is current excitation (a sine wave AC signal) at present, voltage measurement.When the internal conductance rate changes in distribution of thing field, the distribution meeting of current field changes thereupon, causes a built-in potential changes in distribution, thereby the borderline measuring voltage electricity of field domain will change.Utilize borderline measuring voltage, calculate, can rebuild appearance internal conductance rate and distribute, realize visualization measurement by certain imaging.
But using the ERT technology in the past, to carry out the estimation of phase content be the estimation of carrying out the branch phase content according to the pixel distribution of reconstructed image.Because the inhomogeneous and boundary effect of field distribution produces bigger error when tending to cause phase content to estimate.
Summary of the invention
The purpose of this invention is to provide detecting device and method that a kind of biphase gas and liquid flow based on Electrical Resistance Tomography divides phase content, solve an above-mentioned difficult problem, improve measuring accuracy, reduce many-sided needs such as measuring process and calculating to satisfy.
The object of the present invention is achieved like this: a kind of biphase gas and liquid flow based on Electrical Resistance Tomography divides the detecting device of phase content, and its microcomputer and photoelectricity isolation, bus, exciting electrode select analog switch, an end of electrode drive, the input utmost point of sensor to be linked in sequence; The output stage of sensor and the electrode drive other end, detecting electrode select analog switch, bandpass filtering unit A, differential motion amplifying unit, phase demodulation unit, low-pass filter unit, analog-to-digital conversion module, bus to be linked in sequence; Bus and sine-wave generator, voltage-controlled current source, exciting electrode select the other end of analog switch to be linked in sequence, bus also selects the other end of analog switch to be connected with the other end, the detecting electrode of differential motion amplifying unit respectively, the other end of sine-wave generator is connected with the other end of phase demodulation unit, and the bandpass filtering unit B selects analog switch, differential motion amplifying unit to be connected with detecting electrode respectively.
Detector approach based on the biphase gas and liquid flow of Electrical Resistance Tomography divides phase content comprises the following steps:
1, in flow duct, inject tested biphase gas and liquid flow;
2, divide the detecting device of phase content that the sensor that is provided with in the biphase gas and liquid flow pipeline is carried out certain hour responsive the excitation at interval and the detection signal of collection induction boundary voltage by biphase gas and liquid flow;
3, the detection signal data of the induction boundary voltage of being gathered during to fixed time interval by microcomputer are calculated, and obtain the character voltage value V of these frame data
RValue, and to judge the two-phase flow that is detected according to boundary survey voltage in conjunction with flow pattern identification be stratified flow, or bubble flow;
4, for stratified flow, by microcomputer to character voltage value V
RValue is calculated, and utilizes and divides the relevant eigenwert of phase content to calculate with stratified flow, can draw the branch phase content of stratified flow gas-liquid two-phase;
5, for bubble flow, by microcomputer to character voltage value V
RValue is calculated, and utilizes and divides the relevant eigenwert of phase content to calculate with bubble flow, can draw the branch phase content of bubble flow gas-liquid two-phase.
Because the present invention has adopted above technical scheme, thereby has following advantage:
1, adopt the multielectrode sensor array, can obtain the two-dimensional/three-dimensional metrical information that pipeline section distributes.
2, adopt Measured Boundary voltage data feature extracting methods, the information of pipeline section can be concluded extraction at the information relevant with phase content, with the data volume of less symmetry, improve measuring accuracy and speed.
3, calculate according to eigenwert, can be implemented in the quick measurements and calculations that line divides phase content.
Description of drawings
Fig. 1 is a kind of schematic block circuit diagram of the present invention;
Fig. 2 is the shape organigram of a kind of sensor among the present invention;
Fig. 3 is the detector approach synoptic diagram that the biphase gas and liquid flow based on Electrical Resistance Tomography of the present invention divides phase content.
Among the figure:
1, sine-wave generator 2, voltage-controlled current source 3, electrode drive
4, exciting electrode is selected analog switch 5, and detecting electrode is selected analog switch 6, bandpass filtering unit A
7, bandpass filtering unit B 8, differential motion amplifying unit 9, phase demodulation unit
10, low-pass filter unit 11, analog-to-digital conversion module 12, bus
13, photoelectricity isolates 14, microcomputer 15, sensor
16, exciting current signal 17, detectable voltage signals 18, conduit section
19, inner-walls of duct 20, pipeline outer wall 21, electrode leads to client
22, electrode 23, responsive field excitation unit 24, measured signal converting unit
25, data acquisition and processing unit 26, image reconstruction and thing field parameter extraction unit 27, display
28, the measurement parameter output terminal
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is done as detailed below:
In Fig. 1, divide the detecting device of phase content based on the biphase gas and liquid flow of Electrical Resistance Tomography, its microcomputer 14 and photoelectricity isolate 13, bus 12, exciting electrode select analog switch 4, an end of electrode drive 3, the input utmost point of sensor 15 to be linked in sequence; The other end of the output stage of sensor 15 and electrode drive 3, detecting electrode select analog switch 5, bandpass filtering unit A6, differential motion amplifying unit 8, phase demodulation unit 9, low-pass filter unit 10, analog-to-digital conversion module 11, bus 12 to be linked in sequence; Bus 12 selects the other end of analog switch 4 to be linked in sequence with sine-wave generator 1, voltage-controlled current source 2, exciting electrode, bus 12 also selects the other end of analog switch 5 to be connected with the other end, the detecting electrode of differential motion amplifying unit 8 respectively, the other end of sine-wave generator 1 is connected with the other end of phase demodulation unit 9, and bandpass filtering unit B 7 selects analog switch 5, differential motion amplifying unit 8 to be connected with detecting electrode respectively.Wherein,
Sine-wave generator 1 is used under the control of microcomputer 14, the excitation sine wave of the required detection of chromatographic imaging system that has a resistance, and it can adopt digital waveform generator EPROM2764.
Voltage-controlled current source 2 is used for converting the voltage signal of sine-wave generator output to current signal.Voltage-controlled current source 2 is input as the voltage sine wave signal, is output as current sinusoidal ripple signal (pumping signal).The frequency that obtains its pumping signal of current excitation signal through voltage-controlled current source is respectively 5.86KHz, 11.72KHz, 23.44KHz, 46.88KHz, 93.75KHz, Pyatyi frequency of operation altogether; The amplitude of driving source output current between 0-10mA 256 grades optional; Phase place between 0 °-180 ° or between 0 °--180 ° 256 grades adjustable; It can adopt dual operational amplifier LF411 positive feedback to constitute.
Exciting electrode is selected analog switch 4, is used to select exciting electrode (each two adjacent excitations of gating); Its analog switch that adopts can select 2 16 to select 1 multi-way switch MAX306 chip, and wherein the common port of U1 connects exciting current, and the common port gang mould of U2 intends ground.Produce the address signal of MAX306 by trigger 74LS374 by computing machine 14.Each U1, (and these two electrodes are adjacent to electrode of each gating of U2, constitute adjacent excitation), wherein the exciting current signal is added on the exciting electrode of U1 institute gating by the common port inflow of U1, induction current has so just formed an energized circuit by the common end grounding of the electrode outflow process U2 of U2 institute gating.
Detecting electrode is selected analog switch 5, is used to select detecting electrode (each two adjacent detections of gating); Its analog switch that adopts can select 2 16 to select 1 multi-way switch, and as the MAX306 chip, the common port of U3 wherein is for detecting voltage output end V1, and the common port of U4 detects voltage output end V2 for another road, is produced by trigger 74LS374 by computing machine 14.
Bandpass filtering unit A6, bandpass filtering unit B 7 are used to filter the waveform of other noise frequency; It can select 8 multi-way switch MAX307 and a slice 8 to select 1 multi-way switch MAX308 and operational amplifier LF411 to constitute by two 8.Because native system can be operated in 5 different frequencies, bandpass filtering makes detected voltage waveform pass through just, reaches the purpose that filters other noise.And the frequency of detected voltage waveform is identical with the frequency of exciting current, so the centre frequency that bandpass filtering can be by the waveform frequency of exciting current just.Because the present invention can be 5 frequency work, thus the centre frequency of bandpass filter with it correspondence also be 5.By changing the RC value of bandpass filter, can change its centre frequency, their control signal frequency is just selected signal.The input signal of bandpass filtering unit is detected voltage signal V
1, V
2Be output as voltage signal V through filtering
1', V
2'.
Differential motion amplifying unit 8, the differential mode that is used for finishing signal under the condition that does not need additional circuit are amplified (enlargement factor can for 100,200 etc.).The input signal of differential motion amplifying unit is V
1', V
2'; Output signal is V=n* (V
1'-V
2'), V is an output signal in the formula, n is an enlargement factor.Differential motion amplifying unit is made of precision instrument amplifier AD624.
Phase demodulation unit 9 is used for sine wave signal is converted to half-wave voltage signal; What the present invention adopted is the mode of switch demodulation, and it can adopt MAX301 as separating tune switch, and counter CD4024 highest address bit signal is as the switch of restituted signal control MAX301, and the input signal of demodulation part is V, and output signal is a half-wave shape.
Low-pass filter unit 10 is used for the later half-wave voltage signal of demodulation and changes into direct current signal output through quadravalence Butterworth low-pass filter; It can adopt operational amplifier LF411.
Analog-to-digital conversion module 11 is used for converting the analog DC signal of low-pass filter unit 10 outputs to digital signal output by 12 analog to digital converter AD1674; It can adopt AD1674.
Photoelectricity isolates 13, is used for the isolated from power with the power supply and the computing machine of system; Can select quick photoelectric isolating device 6N137 for use.
In Fig. 2, sensor 15 is made of exciting current signal 16, detectable voltage signals 17, inner-walls of duct 19, pipeline outer wall 20, electrode leads to client 21, electrode 22 etc.Inner-walls of duct 19 is provided with 16 uniform electrodes 22, and on the pipeline outer wall 20 and be connected with the electrode leads to client 21 that matches, electrode leads to client 21 is connected to electrode drive 3 by lead respectively.
In the present invention, adopt responsive the excitation and the method for induction boundary voltage to sample to the biphase gas and liquid flow pipeline.At first by the adjacent current excitation, the mode of adjacent voltage detecting encourages and voltage sample pipeline.Select two adjacent electrodes respectively as the inflow and the outflow electrode of exciting current then each time, measure 14 adjacent in twos magnitudes of voltage that induce of electrode of residue simultaneously.Conversion excitation angle then (totally 16 excitation angle); And the like, will obtain the sampled signal of 1 frame data of 16 * 13 (totally 208) measuring voltage values at last, and be delivered to electrode drive 3, thereby three width of cloth data of gathering same flow pattern when obtaining fixed time interval characterize the three-dimensional information data of flow pattern.
In Fig. 3,
Responsive field excitation unit 23 is made of sine-wave generator 1 and voltage-controlled current source 2, is used to produce pumping signal.
Measured signal converting unit 24 selects analog switch 4, detecting electrode to select analog switch 5 to constitute by electrode drive 3, exciting electrode, is used for excitation and detection signal.
Data acquisition and processing unit 25, constitute by bandpass filtering unit A6, bandpass filtering unit B 7, differential mode amplifying unit 8, phase demodulation unit 9, low-pass filter unit 10 and analog-to-digital conversion module 11, be used for the detection signal Useful Information is converted to digital quantity.
Image reconstruction and thing field parameter extraction unit 26 are made of microcomputer 14 and corresponding calculated method, are used for the feature extraction and the image reconstruction of data.
Measurement parameter output terminal 28 is made of display or printer etc., is used for showing or export measurement, result calculated that it can adopt any display or printer etc.(when measurement parameter output terminal 28 adopted display, it can omit above-mentioned display 27).
When the present invention used in actual measurement, its biphase gas and liquid flow based on Electrical Resistance Tomography divided the detector approach of phase content, comprises the following steps:
1, in flow duct, inject tested biphase gas and liquid flow.
2, the detecting device that divides phase content by biphase gas and liquid flow, the sensor 15 that is provided with in the biphase gas and liquid flow pipeline is produced pumping signal by responsive field excitation unit 23 (sine-wave generator 1 and voltage-controlled current source 2), and select analog switch 4 to carry out responsive excitation at a certain time interval by exciting electrode, select the adjacent in twos electrode (except the exciting electrode) of analog switch 5 gatings with detecting electrode, gather the measuring-signal of induction boundary voltage.
3, the boundary voltage detection signal is through data acquisition and processing unit 25 (in bandpass filtering unit A6, bandpass filtering unit B 7, differential mode amplifying unit 8, phase demodulation unit 9, low-pass filter unit 10 and analog-to-digital conversion module 11 change), digital signal is transported to microcomputer 14, the detection signal data of the induction boundary voltage of gathering during by 14 pairs of fixed time intervals of microcomputer are calculated, and obtain the character voltage value V of these frame data
RValue, and to judge the two-phase flow that is detected according to boundary survey voltage in conjunction with flow pattern identification be stratified flow, or bubble flow.
4, for stratified flow, by 14 pairs of character voltage values of microcomputer V
RValue is calculated, and utilization divides phase content relevant eigenwert with stratified flow, and rule of thumb formula calculates the branch phase content that can draw the stratified flow gas-liquid two-phase.
Experimental formula
V in the formula
RBe the character voltage value of trying to achieve,
A is the gas phase phase content, a
0--a
5Be undetermined coefficient, can demarcate according to the difference of medium and the size of caliber.5, for bubble flow, by 14 pairs of character voltage values of microcomputer V
RValue is calculated, utilize with bubble flow divide the relevant eigenwert of phase content rule of thumb formula calculate the branch phase content that can draw the bubble flow gas-liquid two-phase.
Experimental formula
V in the formula
RBe the character voltage value of trying to achieve,
A is the gas phase phase content, a
0--a
3Be undetermined coefficient, can demarcate according to the difference of medium and the size of caliber.By last, the present invention obtains the value relevant with phase content after being extracted by detected boundary characteristic, just can obtain accurate biphase gas and liquid flow and divide phase content.
The present invention can be applicable to the measurement of the branch phase content of gas/liquid, liquid/liquid two-phase in the industrial process.Polyphasic flow as chemical field is carried, the application in the sulfuration bed, and the flow measurement of petroleum industry and environmental monitoring, the energy, metallurgy, fields such as pharmacy all are with a wide range of applications.Simultaneously, because the branch phase content of two-phase flow is the basic parameter of fluid, relate to thermodynamics, the reaction kinetics of two-phase flow in the above every profession and trade, the research of aspects such as fluid mechanics, and during the flow parameter measurement in the industrial processes, all can use the measurement that detecting device of the present invention and method are carried out the branch phase content.
Claims (3)
1. the biphase gas and liquid flow based on Electrical Resistance Tomography divides the detecting device of phase content, it is characterized in that, microcomputer and photoelectricity isolation, bus, exciting electrode select analog switch, an end of electrode drive, the input utmost point of sensor to be linked in sequence; The output stage of sensor and the electrode drive other end, detecting electrode select analog switch, bandpass filtering unit A, differential motion amplifying unit, phase demodulation unit, low-pass filter unit, analog-to-digital conversion module, bus to be linked in sequence; Bus and sine-wave generator, voltage-controlled current source, exciting electrode select the other end of analog switch to be linked in sequence, bus also selects the other end of analog switch to be connected with the other end, the detecting electrode of differential motion amplifying unit respectively, the other end of sine-wave generator is connected with the other end of phase demodulation unit, and the bandpass filtering unit B selects analog switch, differential motion amplifying unit to be connected with detecting electrode respectively.
2. a kind of biphase gas and liquid flow based on Electrical Resistance Tomography according to claim 1 divides the detecting device of phase content, it is characterized in that, sensor is provided with 16 uniform electrodes, and pipeline outer wall is provided with and connects the electrode tip that matches, and electrode tip is connected with electrode driver respectively.
3. the detector approach that the biphase gas and liquid flow based on Electrical Resistance Tomography according to claim 1 divides phase content comprises the following steps:
1) in flow duct, injects tested biphase gas and liquid flow;
2) divide the detecting device of phase content by biphase gas and liquid flow, to the sensor that is provided with in the biphase gas and liquid flow pipeline carry out certain hour at interval responsive excitation and gather the detection signal of induction boundary voltage;
3) the detection signal data of the induction boundary voltage of being gathered during to fixed time interval by microcomputer are calculated, and obtain the character voltage value V of these frame data
RBe worth, and discern in conjunction with flow pattern according to boundary survey voltage, judging the two-phase flow that is detected is stratified flow, or bubble flow;
4) for stratified flow, by microcomputer to character voltage value V
RValue is calculated, and utilizes and divides the relevant eigenwert of phase content to calculate with stratified flow, can draw the branch phase content of stratified flow gas-liquid two-phase;
5) for bubble flow, by microcomputer to character voltage value V
RValue is calculated, and utilizes and divides the relevant eigenwert of phase content to calculate with bubble flow, can draw the branch phase content of bubble flow gas-liquid two-phase.
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| CN100437046C (en) * | 2006-11-30 | 2008-11-26 | 天津大学 | Measuring method of gas-liquid two-phase flow based on section measuring and apparatus thereof |
| CN101419180B (en) * | 2008-12-04 | 2012-02-22 | 天津大学 | Conductive sensor for phase separation containing rate in two-phase stream and structure parameter optimizing method thereof |
| CN103760612A (en) * | 2014-01-17 | 2014-04-30 | 华北电力大学（保定） | Visualization measurement method for specific retention under oil field well |
| CN104634829A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
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| CN106770479A (en) * | 2016-12-09 | 2017-05-31 | 中国科学院合肥物质科学研究院 | Prepare anisotropic conductive composite solidification process detecting system |
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| CN111398371A (en) * | 2020-04-07 | 2020-07-10 | 清华大学 | Method and device for measuring phase content rate |
| CN111595905A (en) * | 2020-05-25 | 2020-08-28 | 北京机械设备研究所 | Hydraulic pipeline bubble monitoring device and method |
| CN113203793A (en) * | 2021-04-29 | 2021-08-03 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Gas-liquid two-phase detection device and method based on voice coil element |
| CN113294411A (en) * | 2021-04-29 | 2021-08-24 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Exhaust device and method based on voice coil element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100437046C (en) * | 2006-11-30 | 2008-11-26 | 天津大学 | Measuring method of gas-liquid two-phase flow based on section measuring and apparatus thereof |
| CN101419180B (en) * | 2008-12-04 | 2012-02-22 | 天津大学 | Conductive sensor for phase separation containing rate in two-phase stream and structure parameter optimizing method thereof |
| CN103760612A (en) * | 2014-01-17 | 2014-04-30 | 华北电力大学（保定） | Visualization measurement method for specific retention under oil field well |
| CN103760612B (en) * | 2014-01-17 | 2017-03-29 | 华北电力大学（保定） | A kind of oil field well specific retention visualization measurement method |
| CN104634829A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
| CN104634829B (en) * | 2015-02-16 | 2017-03-22 | 天津大学 | Electrical tomography Lp-regularized reconstructing method based on p-vector geometric shrinkage |
| CN106153149B (en) * | 2016-07-19 | 2019-01-15 | 天津大学 | Two-phase flow containing rate ultrasonic echo measurement method |
| CN106153149A (en) * | 2016-07-19 | 2016-11-23 | 天津大学 | Two phase flow phase content ultrasonic echo measuring method |
| CN106770479A (en) * | 2016-12-09 | 2017-05-31 | 中国科学院合肥物质科学研究院 | Prepare anisotropic conductive composite solidification process detecting system |
| CN107822641A (en) * | 2017-10-27 | 2018-03-23 | 西安科技大学 | A kind of sole stress dynamic measurement device and method |
| CN111398371A (en) * | 2020-04-07 | 2020-07-10 | 清华大学 | Method and device for measuring phase content rate |
| CN111398371B (en) * | 2020-04-07 | 2021-03-23 | 清华大学 | Method and device for measuring phase content rate |
| CN111595905A (en) * | 2020-05-25 | 2020-08-28 | 北京机械设备研究所 | Hydraulic pipeline bubble monitoring device and method |
| CN113203793A (en) * | 2021-04-29 | 2021-08-03 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Gas-liquid two-phase detection device and method based on voice coil element |
| CN113294411A (en) * | 2021-04-29 | 2021-08-24 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Exhaust device and method based on voice coil element |
| CN113294411B (en) * | 2021-04-29 | 2023-11-07 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Exhaust device and method based on voice coil element |
| CN114216933A (en) * | 2021-12-16 | 2022-03-22 | 北京航空航天大学 | Gas-liquid two-phase flow measuring device and method suitable for open-area flow field |
| CN114216933B (en) * | 2021-12-16 | 2023-11-24 | 北京航空航天大学 | Gas-liquid two-phase flow measuring device and method suitable for open-area flow field |
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