CN102768229B - Twin-array-type capacitive transducer and gas solid two-phase flow detection method thereof - Google Patents

Twin-array-type capacitive transducer and gas solid two-phase flow detection method thereof Download PDF

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Publication number
CN102768229B
CN102768229B CN201210258938.4A CN201210258938A CN102768229B CN 102768229 B CN102768229 B CN 102768229B CN 201210258938 A CN201210258938 A CN 201210258938A CN 102768229 B CN102768229 B CN 102768229B
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China
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distribution
dual
capacitive array
concentration
electrode
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CN201210258938.4A
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Chinese (zh)
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CN102768229A (en
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杨道业
张智
李虎
徐弈辰
施源
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南京工业大学
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Abstract

The invention discloses a twin-array-type capacitive transducer and a gas solid two-phase flow detection method thereof, which belong to the field of multiphase flow detection. According to the dual-array-type capacitive transducer and the gas solid two-phase flow detection method thereof, the internal local concentration of the transducer is obtained through measuring the capacitance between of adjacent electrode plates by utilizing the characteristic that the adjacent electrode plates of the twin-array-type capacitive transducer have nonuniform sensitivity, so that the phase concentration distribution of two pipeline internal sections is rebuilt. Based on the characteristic that the random change of local concentration of the dispersed phase in a fluid causes the random change of the capacitance between the electrode plates, the pipeline internal velocity field distribution is rapidly rebuilt by using a cross correlation method so that noncontact monitoring and study are carried out on the disciplinarian of the stability, a flow pattern and the like of a gas solid flow according to the concentration distribution and the velocity distribution. The method provided by the invention is used as an extension of an electrical capacitance tomography (ECT) and has few measurement data, no complex operations and rapid detection velocity; the nonlinear error caused by rebuilding an ECT image is avoided, and accurate and reliable detection is realized; and a powerful means for the flow characteristic study of the gas solid two-phase flow is provided.

Description

Two capacitive array sensors and Dual-Phrase Distribution of Gas olid detection method thereof
Technical field
The present invention relates to a kind of capacitive transducer and adopt the method for Dual-Phrase Distribution of Gas olid in its detecting sensor pipeline, belong to polyphasic flow detection technique field, for realizing, Gas-solid Two-phase Flow process diagnose and flow characteristics is tested.
Background technology
The method detecting for Dual-Phrase Distribution of Gas olid is a lot, as tomography, and high speed video process, electrostatic method etc.Wherein, high speed video process can obtain the dynamic flow situation of fluid accurate and visually, but is subject to the restriction of fluid transparency, can only be applied to during dilute phase flows, be of limited application; Electrostatic methods utilizes the static of responding in solid particle flow process to obtain the flow parameter of fluid, has detection speed soon and advantages of simple structure and simple, but when detecting the concentration of Dual-Phrase Distribution of Gas olid, need to do a large amount of staking-out works for induction system.Process tomographic imaging (PT) technology is the process detection technique of new generation that the progress along with information and detection technique develops rapidly, and in gas-solid flow with ECT(Electrical Capacitance Tomography, capacitance chromatography imaging) technology is most widely used.
Electrical capacitance tomography is a kind of polyphasic flow parameter detecting technology that starts to grow up from the mid-80.Be characterized in low cost, fast response time, Noninvasive, applied widely, security good, at gas/oil (oil/water) stream of petroleum pipe line, the aspects such as gas/solid stream that strength is carried have a wide range of applications.Thereby electrical capacitance tomography principle is by capacitive transducer, to obtain the distributed image of the specific inductive capacity distribution acquisition medium of medium on pipeline section.Capacitance tomography system is mainly comprised of ECT sensor, capacitance data data acquisition and controlling circuit and image reconstruction computing machine three parts.By fluid, the distribution of each phase information in pipeline is converted into corresponding capacitance data to ECT sensor.The capacitance data of data acquisition circuit pick-up transducers output is also sent in tomography computer.Tomography computer reconstructs corresponding phase distributed image and shows according to capacitance data.From the image that capacitance chromatography imaging is rebuild, can extract solid concentration, adopt two sensor arraies can be from concentration sequence extraction rate.But because himself theory is still perfect not, such as soft field effect, the nonlinearity erron in image reconstruction, makes imaging precision not high enough, has limited its application.In addition, Image Reconstruction Algorithms of ECT System is complicated, is difficult to accomplish real time imagery.And capacitance chromatography imaging image pixel is high, if to rebuilding each pixel extraction rate of image, calculated amount is huge, cannot obtain real-time speed field.
In capacitance chromatography imaging, because the sensitive field of capacitive array sensor is inhomogeneous, bring certain impact to image reconstruction quality, as fringe region and central area imaging effect difference large etc., but give, with capacitive array sensor, measure local concentration and provide that implement may.
Summary of the invention
Technical matters to be solved by this invention is defect and the deficiency existing for above-mentioned prior art, in Dual-Phrase Distribution of Gas olid detects, solve electrical capacitance tomography not high defect with meeting real-time measurement of precision on pipeline section velocity field is extracted, and simplified measurement system, reduce calculated amount.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A pair capacitive array sensor, comprises n exciting electrode and n detecting electrode, and alternately, n is natural number for described exciting electrode and detecting electrode, and described detecting electrode is divided into symmetrical two parts in the axial direction, and between two parts, has interval L.
Further, a kind of pair of capacitive array sensor of the present invention, the specific inductive capacity of the internal diameter of described interval L pipeline in sensor actual measurement environment of living in and pipe thickness, pipeline material determines.
Further, a kind of pair of capacitive array sensor of the present invention, described exciting electrode encourages two pairs of detecting electrodes that are adjacent simultaneously.
The present invention also provides a kind of Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors, and described detection method comprises the following steps:
Steps A, in the residing pipeline of two capacitive array sensors, when having Dual-Phrase Distribution of Gas olid to flow through two capacitive array sensor, the conveying powdered solid of the strength of take is tested object, by measuring between two capacitive array sensor adjacent electrodes electric capacity to obtain the inner solid phase local concentration of two capacitive array sensors, thereby the solid concentration of rebuilding two cross sections of the two capacitive array sensors of pipe interior distributes;
Step B, according to the random variation of solid phase local concentration in Dual-Phrase Distribution of Gas olid fluid, cause the random variation of electric capacity between two capacitive array sensor pole plates, to the concentration in two cross sections of two capacitive array sensors, adopt cross-correlation method to calculate local location speed, and then rebuild the distribution of pipe interior velocity field;
Step C, the velocity field that the solid concentration recording according to steps A distributes and step B records distributes, and the flow process of Dual-Phrase Distribution of Gas olid is monitored with convection and identified.
Further, Dual-Phrase Distribution of Gas olid detection method of the present invention, described steps A by electric capacity between survey sensor adjacent electrode to obtain sensor internal local concentration, to obtain the output capacitance of two capacitive array sensors and the relation between solid phase local concentration by finite element method, simulate the relation function of output capacitance and solid phase local concentration, thereby calculate solid phase local concentration by the adjacent electrode C meter of measuring.
Further, Dual-Phrase Distribution of Gas olid detection method of the present invention, described in step C, the flow process of Dual-Phrase Distribution of Gas olid being monitored to the concrete grammar of identifying with convection is: by solid concentration, distributed and monitored Gas-solid Two-phase Flow process with velocity distribution, wherein solid concentration abundance reflects the solid-gas ratio of Dual-Phrase Distribution of Gas olid, the dynamic flow situation of velocity distribution amount reflection Dual-Phrase Distribution of Gas olid, by CONCENTRATION DISTRIBUTION and velocity distribution combination, can realize monitoring Gas-particle Flows process.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, reduce the quantity of measuring electric capacity.The present invention utilizes Sensitirity va1ue maximum principle between sensor adjacent electrode, so the electric capacity that the present invention only measures between adjacent electrode (be take 12 electrodes as example, the electric capacity quantity that the inventive method need be measured is 12, and the electric capacity quantity that capacitance chromatography imaging need to be measured is 66), thereby measuring electric capacity difficulty reduces, compare with ECT, greatly reduce and measure electric capacity quantity and number of times.
2, improve monitoring Gas-particle Flows process efficiency.The present invention utilizes sensitive inhomogeneous characteristic of sensor to obtain local concentration, rebuilds CONCENTRATION DISTRIBUTION.The complicated algorithm of capacitance chromatography imaging and the nonlinearity erron that reconstruction algorithm brings have been avoided.Two parameters of CONCENTRATION DISTRIBUTION and velocity distribution of take are foundation, and Gas-particle Flows process is carried out to detection and diagnosis, greatly improve its detection and diagnosis efficiency.
Accompanying drawing explanation
Fig. 1 is two capacitive array sensor electrode stretch-out views.Number in the figure 1,3,5,7,9 is exciting electrode, 2a, 2b ... 12a, 12b are detecting electrode.
Fig. 2 is two capacitive array sensor stereographic maps.Number in the figure is explained: 1-exciting electrode; 2-detecting electrode; 3-radome.
Fig. 3 is two capacitive array sensor electrode sections figure.
Number in the figure is explained: 1,3,5,7,9,11 represent respectively exciting electrode; 2,4,6,8,10,12 represent respectively detecting electrode, wherein 2a and 2b, 4a and 4b, 6a and 6b, 8a and 8b, 10a and 10b, 12a and 12b represent respectively two parts up and down of each detecting electrode.
Sensitive area between p1-exciting electrode 1 and detecting electrode 2; Sensitive area between p2-exciting electrode 3 and detecting electrode 2; Sensitive area between p3-exciting electrode 3 and detecting electrode 4; Sensitive area between p4-exciting electrode 5 and detecting electrode 4; Sensitive area between p5-exciting electrode 5 and detecting electrode 6; Sensitive area between p6-exciting electrode 7 and detecting electrode 6; Sensitive area between p7-exciting electrode 7 and detecting electrode 8; Sensitive area between p8-exciting electrode 9 and detecting electrode 8; Sensitive area between p9-exciting electrode 9 and detecting electrode 10; Sensitive area between p10-exciting electrode 11 and detecting electrode 10; Sensitive area between p11-exciting electrode 11 and detecting electrode 12; Sensitive area between p12-exciting electrode 1 and detecting electrode 12.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The present invention detects for Dual-Phrase Distribution of Gas olid, is the extension of electrical capacitance tomography, and measurement data is few and without complex calculation, detection speed is fast; Avoid the nonlinearity erron of ECT image reconstruction, detect accurately and reliably.
Take below that coal dust and air mixture carry is tested object, Dual-Phrase Distribution of Gas olid detection method provided by the invention and effect are described in detail, for object simply clearly, below appropriate omission the description of known technology in order to avoid the description of those unnecessary details impact to the technical program.
Sensitive of adjacent electrode has high sensitivity at exciting electrode 1 and 2 of detecting electrodes, but not sensitive of adjacent electrode is all to have two peak values, and the Sensitivity magnitude of adjacent electrode sensitive area is much larger than non-adjacent electrode capacitance, so the sensitive field of adjacent electrode has best inhomogeneous characteristic, utilize sensitive inhomogeneous feature between two capacitive array sensor adjacent plates, be that sensor electrical electrode capacitance is only responsive to this specific region, output capacitance is the feature relevant with the variation of this regional concentration only, for extract local concentration from adjacent electrode electric capacity, it is most suitable selection, this is also starting point of the present invention.
Comprehensive above analysis, designs a kind of novel two capacitive array sensors, and its structural model (be take 12 electrodes as example) as shown in Figure 1, 2, 3.12 electrodes are equally divided into two classes: exciting electrode and detecting electrode.Wherein exciting electrode and detecting electrode are spaced, and detecting electrode is divided into symmetrical two parts in the axial direction, and between two parts, have interval L, 2a and 2b as shown in Figure 1, and 4a and 4b ... 12a and 12b.Hence one can see that, and 12 electrode capacitance sensors have 12 adjacent electrode electric capacity, so can obtain 12 sensitive area (being the stain region at P1 to P12 place in Fig. 3), also can obtain the concentration of 12 points.The value of interval L can not be too large, can not be too little, if too large, the accurate real-time change of test fluid, if too little, speed that cannot convection cell responds, and also can easily ignore the situation of change of a lot of fluids.Therefore, the specific inductive capacity of the internal diameter of the value of L pipeline in sensor actual measurement environment of living in and pipe thickness, pipeline material determines, in the present embodiment, the value of interval L and detecting electrode 2a and electrode 2b's is equal in length.
In order to reduce axial edge effect for the impact of capacitive transducer and to simplify capacitive detection circuit, in the present invention, the voltage measurement mode of exciting electrode adopts the structure of integral type, and an exciting electrode encourages two pairs of detecting electrodes that are adjacent simultaneously.When coal dust and air mixture are flowed through the residing pipeline of capacitive transducer of the present invention, form a checkout area.
As shown in Figure 1, in this checkout area, the first step, first, using electrode 1 as exciting electrode, measure the electric capacity between the detecting electrode 2b that electric capacity between the detecting electrode 2a that exciting electrode 1 is adjacent and exciting electrode 1 be adjacent, obtain 2 electric capacity of 2 of detecting electrodes that under axial diverse location, exciting electrode 1 is adjacent; Simultaneously, measure the electric capacity between the detecting electrode 12b that electric capacity between the detecting electrode 12a that exciting electrode 1 is adjacent and exciting electrode 1 be adjacent, obtain 2 electric capacity of 12 of detecting electrodes that under axial diverse location, exciting electrode 1 is adjacent.Secondly, using electrode 3 as exciting electrode, adopt above method to obtain 4 electric capacity between two pairs of detecting electrodes that exciting electrode 3 is adjacent.By that analogy, encourage one by one remaining exciting electrode, obtain respectively successively 4 electric capacity between two pairs of detecting electrodes that each exciting electrode is adjacent.
Second step, utilize finite element method to obtain the relation between sensor output capacitance and coal dust local concentration, simulate the relation function of sensor output capacitance and coal dust local concentration, thereby the electrode capacitance of being measured by the first step calculates the local concentration of coal dust.
The 3rd step, utilizes a certain moment t in period T, and the capacitance measurement signal y (t) between capacitance measurement signal x (t-τ), exciting electrode 1 and detecting electrode 2b between exciting electrode 1 and detecting electrode 2a makes cross-correlation calculation, obtains related function R xy (τ), wherein τ represents related function R xy (τ) time variable, cross-correlation calculation formula is as follows:
Again as shown in Figure 3, the peak point R of related function xy m) corresponding time variable is the transit time τ between the axial two parts of detecting electrode m , subscript mrepresent corresponding detecting electrode, and distance L between two capacitive array sensor axial electrode has been determined, so can measure with correlation method the speed V that coal dust is ordered at the corresponding sensitive area P1 of exciting electrode 1 p1=L/ τ m .By that analogy, use the same method and can measure coal dust in the speed of the corresponding sensitive area point of other exciting electrodes.
According to above step, the local concentration that can obtain the coal dust in coal dust and air mixture distributes and velocity distribution.The flow model of setting up coal dust and air mixing phase by CONCENTRATION DISTRIBUTION and the velocity distribution of coal dust, completes the detection of Dual-Phrase Distribution of Gas olid, can monitor timely and effectively the labile factor in flow process, prevents from stopping up.
In not knowing flow pattern process of pneumatic transmission, also can measure the distribution of concentration amount and the distribution of speed amount according to said method.The solid-gas ratio of concentration amount reflection gas-solid flow, the dynamic flow situation of speed amount reflection gas-solid flow.CONCENTRATION DISTRIBUTION and these two parameters of velocity distribution are combined, can detection and diagnosis Gas-particle Flows process, and can carry out identification by convection.

Claims (5)

1. the Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors, described pair of capacitive array sensor comprises n exciting electrode and n detecting electrode, described exciting electrode and detecting electrode are alternately, n is natural number, it is characterized in that, described detecting electrode is divided into symmetrical two parts in the axial direction, and between two parts, has interval L; Described detection method comprises the following steps:
Steps A, in the residing pipeline of two capacitive array sensors, when having Dual-Phrase Distribution of Gas olid to flow through two capacitive array sensor, the conveying powdered solid of the strength of take is tested object, by measuring between two capacitive array sensor adjacent electrodes electric capacity to obtain the inner solid phase local concentration of two capacitive array sensors, thereby the solid concentration of rebuilding two cross sections of the two capacitive array sensors of pipe interior distributes;
Step B, according to the random variation of solid phase local concentration in Dual-Phrase Distribution of Gas olid fluid, cause the random variation of electric capacity between two capacitive array sensor pole plates, to the concentration in two cross sections of two capacitive array sensors, adopt cross-correlation method to calculate local location speed, and then rebuild the distribution of pipe interior velocity field;
Step C, the velocity field that the solid concentration recording according to steps A distributes and step B records distributes, and the flow process of Dual-Phrase Distribution of Gas olid is monitored with convection and identified.
2. the Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors according to claim 1, it is characterized in that: described steps A by electric capacity between survey sensor adjacent electrode to obtain sensor internal local concentration, to obtain the output capacitance of two capacitive array sensors and the relation between solid phase local concentration by finite element method, simulate the relation function of output capacitance and solid phase local concentration, thereby calculate solid phase local concentration by the adjacent electrode C meter of measuring.
3. the Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors claimed in claim 1, it is characterized in that: described in step C, the flow process of Dual-Phrase Distribution of Gas olid being monitored to the concrete grammar of identifying with convection is: by solid concentration, distributed and monitored Gas-solid Two-phase Flow process with velocity distribution, wherein solid concentration abundance reflects the solid-gas ratio of Dual-Phrase Distribution of Gas olid, the dynamic flow situation of velocity distribution amount reflection Dual-Phrase Distribution of Gas olid, by CONCENTRATION DISTRIBUTION and velocity distribution combination, can realize monitoring Gas-particle Flows process.
4. the Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors according to claim 1, is characterized in that: the specific inductive capacity of the internal diameter of described interval L pipeline in sensor actual measurement environment of living in and pipe thickness, pipeline material determines.
5. the Dual-Phrase Distribution of Gas olid detection method based on two capacitive array sensors according to claim 1, is characterized in that: described exciting electrode encourages two pairs of detecting electrodes that are adjacent simultaneously.
CN201210258938.4A 2012-07-25 2012-07-25 Twin-array-type capacitive transducer and gas solid two-phase flow detection method thereof CN102768229B (en)

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CN105973775B (en) * 2016-04-29 2018-11-09 江苏大学 Powder concentration detection device in a kind of spiral conveying tube of two-layer electrode array
CN106199060B (en) * 2016-06-24 2019-02-19 辽宁大学 Dual-Phrase Distribution of Gas olid speed measurement method based on sliding average and capacitance sensor
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