CN111443113A - Electrical tomography (ET for short) two-phase flow measuring system - Google Patents
Electrical tomography (ET for short) two-phase flow measuring system Download PDFInfo
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- CN111443113A CN111443113A CN201910043978.9A CN201910043978A CN111443113A CN 111443113 A CN111443113 A CN 111443113A CN 201910043978 A CN201910043978 A CN 201910043978A CN 111443113 A CN111443113 A CN 111443113A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
- G01N27/10—Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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Abstract
The invention discloses an Electrical Tomography (ET) two-phase flow measuring system, which is suitable for the conveying working condition of real-time change of liquid medium characteristics in a two-phase flow medium. The system comprises an ET sensor, an additional reference point measuring device and a signal generation and data acquisition processing system. The additional reference point sensor and the ET sensor are arranged in the same conveying pipeline system, and the additional reference point sensor and the ET sensor have the functions of measuring the characteristic value of a dilute phase liquid medium in the two-phase flow medium in real time, providing a reference basis for the ET, and offsetting the characteristic value of the reference point medium in real time by judging the distribution of the characteristic value of a sensitive field of the ET sensor to obtain the distribution of the two-phase medium; the characteristic value of the resistance tomography sensitive field is conductivity, and the characteristic value of the capacitance tomography sensitive field is capacitance. The arrangement of the additional reference point measuring device is determined by means of the distribution condition of natural gravity separation caused by sedimentation of different substances forming the two-phase flow due to specific gravity difference. The method is suitable for the industrial field of hydraulic conveying of solid substances and oil substances.
Description
Technical Field
The invention relates to the field of two-phase flow measurement of electrical tomography (ET for short), in particular to a working condition of real-time change of liquid medium characteristics in a two-phase flow medium.
Background
In modern industry and engineering, the method of conveying solid and oil substances through pipelines by utilizing water power is widely applied. The volume ratio of each phase in the two-phase fluid needs to be measured in real time in the conveying process, the distribution condition of each phase on the measured cross section is reflected, the conveying and construction operation is guided, the conveying process is improved, the conveying efficiency is improved, and the production cost is reduced.
In industrial and engineering applications, in recent years, the two-phase flow measurement technology of electrical tomography (ET for short) is greatly developed by the fact that the two-phase flow measurement technology has no radiation and large ratio of the measurement area to the cross section area of a pipeline, can realize the measurement of the volume ratio of each phase, and can also provide two-phase flow distribution information on the cross section. There are many patents in this respect, which are searched for prior published patents. For example, chinese patent publication No. CN108007500A, entitled "sensor system for measuring concentration and velocity by electrical resistance chromatography", describes the measurement of concentration and velocity of multiphase flow. Chinese patent publication No. CN103235013B, entitled "non-contact integrated capacitance/resistance bimodal tomography measuring device and method", discloses a chromatographic multiphase flow measurement analysis technique. Chinese patent publication No. CN1344929A, entitled "electrical resistance tomography apparatus for gas/liquid two-phase pipe flow monitoring and monitoring method", discloses a chromatographic multiphase flow measuring apparatus. The common characteristic is that the distribution and the proportion of each phase of the two-phase fluid are analyzed and measured by utilizing the electrical tomography technology, and the method relates to the sensor technology, the signal generation and acquisition processing and the image reconstruction algorithm. The above prior art schemes are directed to the working condition that the liquid conductivity in the two-phase flow medium does not change in real time with the environmental condition, and the liquid conductivity cannot realize the function when changing in real time with the environmental condition.
Accordingly, it would be desirable to have a new Electrical Tomography (ET) two-phase flow measurement system that overcomes or at least mitigates the above-mentioned deficiencies of the prior art.
Disclosure of Invention
It is an object of the present invention to provide an Electrical Tomography (ET) two-phase flow measurement system which overcomes or at least alleviates the above-mentioned disadvantages of the prior art.
To achieve the above object, the present invention provides an Electrical Tomography (ET) two-phase flow measurement system, comprising: an additional reference point measuring device, an Electrical Tomography (ET) two-phase flow measuring system sensor and a signal generating and data acquiring and processing system; the additional reference point measuring device is used for measuring the characteristics of the liquid medium in the two-phase flow in real time, and is used for reducing and eliminating the influence of real-time change of the characteristics of the liquid medium on the measurement result of the system.
The additional reference point measuring device sensor and the electric tomography (ET for short) two-phase flow measuring system sensor are arranged in the same two-phase fluid conveying pipeline system, and the characteristic change of the dilute-phase liquid medium at the reference point is rapidly detected.
The arrangement of the additional reference point measuring device sensor is determined according to the natural gravity separation condition of two-phase flow media caused by gravity sedimentation caused by the difference of specific gravity of each phase forming the two-phase flow.
The measuring electrodes of the additional reference point measuring device are formed by a group of electrodes of a sensor of an Electrical Tomography (ET) two-phase flow measuring system.
The additional reference point measuring device is a conveying medium dilute phase liquid conductivity measuring device arranged on the conveying pipeline.
The additional reference point measuring device is a conveying medium dilute phase liquid capacitance measuring device arranged on the conveying pipeline.
The invention has the beneficial effect of solving the problem of applicability of an Electrical Tomography (ET) two-phase flow measuring system under the working condition of real-time change of liquid medium characteristics in two-phase fluid.
Drawings
FIG. 1 is a schematic diagram of the composition of an Electrical Tomography (ET) two-phase flow measurement system of the present invention.
FIG. 2 is a schematic cross-sectional view of a sensor of the Electrical Resistance Tomography (ERT) two-phase flow measurement system of the present invention.
FIG. 3 is a schematic cross-sectional view of a sensor of the electrical capacitance tomography (ECT for short) two-phase flow measurement system of the present invention.
FIG. 4 is a schematic cross-sectional view of an additional reference point measuring device of the Electrical Resistance Tomography (ERT) two-phase flow measuring system of the present invention.
FIG. 5 is a schematic cross-sectional view of an additional reference point measuring device of the Electrical Resistance Tomography (ERT) two-phase flow measuring system of the present invention.
FIG. 6 is a schematic cross-sectional view of an additional reference point measuring device sensor of an electrical capacitance tomography (ECT for short) two-phase flow measuring system of the present invention.
FIG. 7 shows the exit of a branched liquid delivery conduit in the dilute liquid region of the two-phase flow delivery conduit body for mounting a reference point measuring device sensor.
In the figure: 1-two-phase flow conveying pipeline, 2-electric tomography (ET for short) two-phase flow measuring system sensor,
2-1-two-phase flow measuring system sensor of resistance tomography (ERT for short),
2-electric capacity tomography (ECT for short) two-phase flow measuring system sensor,
3-signal generation, data acquisition and processing module, 4-additional reference point measuring device,
5-measuring electrode of resistance chromatographic imaging sensor, 6-metal shell, 7-wear-resistant insulating lining,
8-measuring electrodes of an electric capacity tomography sensor, 9-electrodes of an electric resistance tomography additional reference point measuring device, 10-electrodes of an electric capacity tomography additional reference point measuring device, 11-branch conveying pipelines,
Detailed Description
The following further describes the implementation of the present invention with reference to the accompanying drawings.
Referring to fig. 1, the electrical tomography (ET for short) two-phase flow measurement system: the device comprises an electrical tomography (ET for short) two-phase flow measuring system sensor 2, a signal generating, data acquiring and processing system 3 and an additional reference point measuring device 4.
According to the figure 1 and the figure 2, a group of electrodes 5 in a dilute phase liquid area are selected in a sensor 2-1 of a resistance tomography (ERT) two-phase flow measuring system to be used as electrodes of an additional reference point measuring device 4, so as to measure the real-time conductivity of a liquid medium in a conveyed two-phase flow, and counteract the influence of the change of the real-time conductivity of the liquid medium on the conductivity distribution of an object in a sensitive field in a measuring section of the sensor 2-1 of the ERT measuring system, thereby obtaining the distribution condition of the two-phase medium and the volume ratio of each phase.
According to the figure 1 and the figure 3, a group of electrodes 8 in a dilute phase liquid area are selected in a sensor 2-2 of an Electric Capacitance Tomography (ECT) two-phase flow measuring system to be used as electrodes of an additional reference point measuring device 4, so as to measure the real-time capacitance of a liquid medium in a conveyed two-phase flow, and counteract the influence of the real-time capacitance change of the liquid medium on the capacitance tomography (ECT) measuring system when judging the capacitance distribution of an object in a sensitive field in the measuring section of the sensor 2-2, and obtain the distribution condition of the two-phase medium and the volume ratio of each phase.
According to the figure 1 and the figure 4, an additional reference point measuring device 4 is arranged in a dilute phase liquid area of a conveying pipeline 1, a measuring electrode 9 of the additional reference point measuring device is in contact with the dilute phase liquid and is used for measuring the real-time conductivity of a liquid medium in a conveyed two-phase fluid, and the influence of the change of the real-time conductivity of the liquid medium on the conductivity distribution of an object in a sensitive field in a measuring section of a sensor 2-1 of a resistance tomography (ERT) measuring system is counteracted, so that the distribution condition of the two-phase medium and the volume ratio of each phase are obtained.
According to the figure 1 and the figures 5 and 7, an additional reference point measuring device 4 is connected into a branch conveying pipeline 11 to measure the real-time conductivity of the liquid medium in the conveyed two-phase fluid, so as to counteract the influence of the change of the real-time conductivity of the liquid medium on the conductivity distribution of an object in a sensitive field in a measuring section of a sensor 2-1 of a resistance tomography (ERT) measuring system, and obtain the distribution condition of the two-phase medium and the volume ratio of each phase.
According to fig. 1 in combination with fig. 6 and 7, an additional reference point measuring device 4 is connected to the branch conveying line 11 for measuring
The real-time capacitance of the liquid medium in the two-phase fluid for volume delivery counteracts the influence of the real-time capacitance change of the liquid medium on the capacitance tomography (ECT) measurement system when judging the capacitance distribution of an object in a sensitive field in the measurement section of the sensor 2-2 of the ECT measurement system, and the distribution condition of the two-phase medium and the volume ratio of each phase are obtained.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An Electrical Tomography (ET) two-phase flow measuring system, which covers an Electrical Resistance Tomography (ERT) two-phase flow measuring system and an Electrical Capacitance Tomography (ECT) two-phase flow measuring system, is characterized by comprising: an additional reference point measuring device; an Electrical Tomography (ET) two-phase flow measuring system sensor and a signal generating and data acquiring and processing system.
2. An Electrical Tomography (ET) two-phase flow measurement system according to claim 1 wherein a reference point measurement device is added to the delivery conduit;
an additional reference point measuring device sensor and an electrical tomography (ET for short) two-phase flow measuring system sensor are arranged in the same two-phase fluid conveying pipeline system, the characteristic change of a dilute-phase liquid medium at a reference point is rapidly detected, and the measured data represents the characteristic of the pipeline liquid medium where the electrical tomography (ET for short) two-phase flow measuring system sensor is arranged, so that a reference basis is provided for the electrical tomography (ET for short) measuring system;
the resistance tomography (ERT) measuring system offsets the conductivity characteristics of the dilute phase liquid measured by the reference point in real time by judging the conductivity distribution of the object in the sensitive field in the sensor measuring section of the resistance tomography (ERT) measuring system to obtain the distribution condition of two-phase media, wherein the volume of each phase accounts for the ratio; the capacitance tomography (ECT) measurement system offsets the capacitance characteristics of the dilute phase liquid measured by the reference point in real time by judging the capacitance distribution of the object in the sensitive field in the sensor measurement section to obtain the distribution condition of the two-phase medium, and the volume ratio of each phase.
3. A two-phase Electrical Tomography (ET) flow measurement system according to claim 2 wherein the additional reference point measuring device sensor is positioned to determine the natural gravity separation of the two-phase flow media caused by gravity settling due to differences in specific gravity of the phases comprising the two-phase flow.
4. An Electrical Tomography (ET) two-phase flow measurement system according to claim 2 wherein the measurement electrodes of the additional reference point measurement device are formed by a set of electrodes in the dilute phase liquid region of the Electrical Resistance Tomography (ERT) two-phase flow measurement system sensor.
5. An Electrical Tomography (ET) two-phase flow measurement system according to claim 2 wherein the measurement electrodes of the additional reference point measurement device are formed by a set of electrodes in the dilute phase liquid region of the sensor of the Electrical Capacitance Tomography (ECT) two-phase flow measurement system.
6. An Electrical Tomography (ET) two-phase flow measurement system according to claim 2 wherein the additional reference point measurement device is a delivery medium dilute phase liquid conductivity measurement device mounted on the delivery conduit.
7. An Electrical Tomography (ET) two-phase flow measurement system according to claim 2 wherein the additional reference point measurement device is a transport medium dilute phase liquid capacitance measurement device mounted on the transport conduit.
8. An Electrical Tomography (ET) two-phase flow measurement system according to any of claims 1 to 7, wherein the two-phase flow is a two-phase fluid for hydraulically transporting solid matter.
9. The two-phase Electrical Tomography (ET) flow measurement system according to any one of claims 1 to 7, wherein the two-phase flow is a two-phase fluid for hydraulically transporting oil substances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910043978.9A CN111443113A (en) | 2019-01-17 | 2019-01-17 | Electrical tomography (ET for short) two-phase flow measuring system |
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| CN201910043978.9A CN111443113A (en) | 2019-01-17 | 2019-01-17 | Electrical tomography (ET for short) two-phase flow measuring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255088A (en) * | 2020-11-06 | 2021-01-22 | 长江武汉航道工程局 | Method for evaluating erosion wear of wear-resistant village particles of sensor |
| CN112285165A (en) * | 2020-10-23 | 2021-01-29 | 天津大学 | Calibration system for flow velocity and concentration of pipeline multiphase flow based on electrical chromatography technology |
| CN112285164A (en) * | 2020-10-23 | 2021-01-29 | 天津大学 | Concentration calibration device based on electrical chromatography technology |
-
2019
- 2019-01-17 CN CN201910043978.9A patent/CN111443113A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285165A (en) * | 2020-10-23 | 2021-01-29 | 天津大学 | Calibration system for flow velocity and concentration of pipeline multiphase flow based on electrical chromatography technology |
| CN112285164A (en) * | 2020-10-23 | 2021-01-29 | 天津大学 | Concentration calibration device based on electrical chromatography technology |
| CN112285164B (en) * | 2020-10-23 | 2023-01-17 | 天津大学 | Concentration calibration device based on electrical chromatography technology |
| CN112255088A (en) * | 2020-11-06 | 2021-01-22 | 长江武汉航道工程局 | Method for evaluating erosion wear of wear-resistant village particles of sensor |
| CN112255088B (en) * | 2020-11-06 | 2023-09-12 | 长江武汉航道工程局 | Method for evaluating erosion and abrasion of wear-resistant inner village particles of sensor |
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Application publication date: 20200724 |