阅读说明：本技术 基于电学层析成像的三维液固两相流检测装置及检测方法 (Three-dimensional liquid-solid two-phase flow detection device and method based on electrical tomography ) 是由 张群 王仕辅 李日新 杜君梅 张红漫 李�浩 王磊 李辛 李蒙 赵进 张敏 周 于 2020-06-09 设计创作，主要内容包括：本发明提出了基于电学层析成像的三维液固两相流检测装置及检测方法,在输送管道的内壁上等间距设置三组结构相同的第一电极阵列,每组第一电极阵列中的相同编号的电极沿输送管道内壁轴向方向正对设置,通过第一组第一电极阵列和第三组第一电极阵列确定椭圆长轴端点,通过第二组第一电极阵列确定椭圆短轴端点,通过切换椭圆长轴端点和椭圆短轴端点,可以获取若干个椭圆,在输送管道上相邻的两组第一电极阵列之间选取M个沿输送管道径向方向的横截面,单个横截面与M个椭圆的交点即为一组第二电极阵列中P个电极的安装位置,进而确定第二电极阵列中各电极的安装位置,提高测量结果的精确度,实现基于电学层析成像的三维液固两相流检测目的。(The invention provides a three-dimensional liquid-solid two-phase flow detection device and a detection method based on electrical tomography, wherein three groups of first electrode arrays with the same structure are arranged on the inner wall of a conveying pipeline at equal intervals, electrodes with the same number in each group of first electrode arrays are oppositely arranged along the axial direction of the inner wall of the conveying pipeline, the end points of the long axis of an ellipse are determined by the first group of first electrode arrays and the third group of first electrode arrays, the end points of the short axis of the ellipse are determined by the second group of first electrode arrays, a plurality of ellipses can be obtained by switching the end points of the long axis of the ellipse and the short axis of the ellipse, M cross sections along the radial direction of the conveying pipeline are selected between two adjacent groups of first electrode arrays on the conveying pipeline, the intersection points of a single cross section and the M ellipses are the installation positions of P electrodes in one group of second electrode arrays, and then the, the accuracy of the measurement result is improved, and the purpose of three-dimensional liquid-solid two-phase flow detection based on electrical tomography is achieved.)

1. Three-dimensional liquid-solid two-phase flow detection device based on electrical tomography is characterized by comprising: the device comprises a conveying pipeline (1), three groups of first electrode arrays (2) and a plurality of groups of second electrode arrays (3);

the three groups of first electrode arrays (2) are respectively arranged on the inner wall of the conveying pipeline (1) at equal intervals;

each group of the first electrode arrays (2) comprises M electrodes, wherein M is 16N, and N is a positive integer; m electrodes in each group of first electrode arrays (2) are numbered sequentially from 1 to M; m electrodes in each group of the first electrode arrays (2) are arranged at equal intervals along the circumferential direction of the inner wall of the conveying pipeline (1), and the electrodes with the same number in each group of the first electrode arrays (2) are arranged oppositely along the axial direction of the inner wall of the conveying pipeline (1);

each group of the second electrode arrays (3) comprises P electrodes, wherein P is 32N, and N is a positive integer;

the geometric centers of the electrodes numbered 1 in the first group of first electrode arrays (2) and the electrodes numbered Q in the third group of first electrode arrays (2) form the endpoints of the long axis of the ellipse, wherein Q is 8N + 1; the geometric centers of the electrodes numbered 4N +1 and 12N +1 in the second group of the first electrode array (2) form the end points of the short axis of the ellipse; sequentially circulating until M electrodes in the first group of first electrode arrays (2) are traversed, and establishing M ellipses;

a plurality of cross sections along the radial direction of the conveying pipeline (1) are selected between two adjacent groups of first electrode arrays (2) on the conveying pipeline (1), and the intersection point of a single cross section and M ellipses is the installation position of P electrodes in one group of second electrode arrays (3).

2. The electrical tomography-based three-dimensional liquid-solid two-phase flow detection device according to claim 1, wherein: the number of the second electrode arrays (3) is S groups, wherein S is 8N-2, and N is a positive integer;

the S groups of second electrode arrays (3) are respectively arranged between two adjacent first electrode arrays (2) at intervals.

3. The electrical tomography-based three-dimensional liquid-solid two-phase flow detection device according to claim 2, wherein: z groups of second electrode arrays (3) are uniformly arranged in the first group of first electrode arrays (2) and the second group of first electrode arrays (2) at equal intervals, wherein Z is 4N-1, and N is a positive integer.

4. The electrical tomography-based three-dimensional liquid-solid two-phase flow detection device according to claim 2, wherein: and the S groups of second electrode arrays (3) are symmetrically distributed on the inner peripheral wall of the conveying pipeline (1) relative to the second group of first electrode arrays (2).

5. The electrical tomography-based three-dimensional liquid-solid two-phase flow detection device according to claim 3, wherein: p electrodes in each group of second electrode arrays (3) are arranged at intervals along the circumferential direction of the inner wall of the conveying pipeline (1), wherein the P electrodes are divided into M odd electrodes and M even electrodes which are arranged at intervals in sequence, the intervals between every two adjacent odd electrodes are equal, and the intervals between every two adjacent even electrodes are equal.

6. The three-dimensional liquid-solid two-phase flow detection method based on the electrical tomography is characterized by comprising the following steps of:

s1, sequentially measuring the cross section conductivity or permittivity distribution of the three groups of first electrode arrays (2) and the S group of second electrode arrays (3) by using 1-M electrodes on the first group of first electrode arrays (2), odd-numbered electrode groups or even-numbered electrode groups on the Z group of second electrode arrays (3), 1-M electrodes on the second group of first electrode arrays (2), odd-numbered electrode groups or even-numbered electrode groups on the Z group of second electrode arrays (3) and 1-M electrodes on the third group of first electrode arrays (2) by adopting an ERT technology or an ECT technology;

s2, measuring the conductivity or permittivity distribution of the first elliptical section to the Mth elliptical section by adopting an ERT (earth-insulated switchgear) technology or an ECT (electro-discharge technology) technology of the same principle;

and S3, establishing a space coordinate system, if the point is on the measured plane, the conductivity of the point is the conductivity or the permittivity obtained by the original measurement of the point through the ERT technology or the ECT in the step 2-3, and the conductivity of the point which is not on the measured plane is calculated by the measured data values around the point in a machine learning mode.

S4, entering the next measuring period.

Technical Field

The invention relates to the technical field of flow and concentration measurement in a dredging medium conveying process, in particular to a three-dimensional liquid-solid two-phase flow detection device and a detection method based on electrical tomography.

Background

Dredging is to dredge, widen or dig deep water areas such as rivers and lakes, and carry out underwater earth and stone excavation engineering by manpower or machinery. The construction of the drag suction dredger, the cutter suction dredger and the bucket wheel dredger is that the dredging soil is conveyed by utilizing water power through a pipeline, in the construction process, an operator needs to master the concentration parameter of the liquid-solid two-phase flow in real time to control a construction machine and optimize the construction efficiency, and a manager also needs to realize management and examination on the construction yield obtained by calculating the concentration parameter and the flow parameter.

At present, the measurement of the concentration of a dredger in the world is most widely applied by nuclear technology, and is a mainstream device, and when the nuclear technology is applied to the dredger, the measurement principle and the actual construction working condition are not adjustable, so that the guidance and management effects on the construction process can not achieve the expected effect in the actual use process except that the measurement accuracy can not be ensured. In addition, nuclear technology involves radiation management and radiation safety risks, causes great management cost for users, and has strong conflict emotion in the aspects of use and maintenance of source equipment for crews.

With the development of sensor technology and soft and hard technology, the electrical tomography technology (ET technology) provides a solution to the above problems. The ET technique obtains the distribution of the inside of an object by applying electrical excitation to the object to be measured, detecting the change of the boundary value of the object, and reversely pushing the distribution of electrical characteristic parameters inside the object to be measured by using a specific mathematical means. At present, in the measurement of liquid-solid two-phase flow, the ET technology is adopted for measuring a section, so that the real-time conductivity and permittivity distribution of the liquid-solid two-phase flow on the two-dimensional measuring section can be obtained, the three-dimensional ET technology is adopted for converting the two-dimensional measuring section into a three-dimensional image, and the three-dimensional conductivity and permittivity distribution of the liquid-solid two-phase flow in a pipeline can be further obtained.

However, the application field of three-dimensional electrical tomography is mainly in geological exploration and medical detection, the application scene and the implementation method are not suitable for industrial pipeline liquid-solid two-phase flow, and an effective technology for three-dimensionally measuring the liquid-solid two-phase flow flowing in real time in the pipeline by adopting an ET technology is lacked. Therefore, in order to solve the above problems, the present invention provides a three-dimensional liquid-solid two-phase flow detection device and a detection method based on electrical tomography, which implement a technology for three-dimensional measurement of a liquid-solid two-phase flow flowing in real time in an industrial pipeline.

Disclosure of Invention

In view of this, the invention provides a three-dimensional liquid-solid two-phase flow detection device and a detection method based on electrical tomography, and a technology for realizing three-dimensional measurement of liquid-solid two-phase flow flowing in real time in an industrial pipeline is provided.

The technical scheme of the invention is realized as follows: the invention provides a three-dimensional liquid-solid two-phase flow detection device based on electrical tomography, which comprises: the electrode array comprises a conveying pipeline, three groups of first electrode arrays and a plurality of groups of second electrode arrays;

the three groups of first electrode arrays are respectively arranged on the inner wall of the conveying pipeline at equal intervals;

each group of first electrode arrays comprises M electrodes, wherein M is 16N, and N is a positive integer; m electrodes in each group of first electrode arrays are numbered sequentially from 1 to M; m electrodes in each group of first electrode arrays are arranged at equal intervals along the circumferential direction of the inner wall of the conveying pipeline respectively, and the electrodes with the same number in each group of first electrode arrays are arranged oppositely along the axial direction of the inner wall of the conveying pipeline;

each group of second electrode arrays comprises P electrodes, wherein P is 32N, and N is a positive integer;

the geometric centers of the electrodes numbered 1 in the first group of first electrode arrays and the electrodes numbered Q in the third group of first electrode arrays form the endpoints of the major axis of the ellipse, wherein Q is 8N + 1; the geometric centers of the electrodes numbered 4N +1 and 12N +1 in the second group of the first electrode array form the end points of the short axis of the ellipse; sequentially circulating until M electrodes in the first group of first electrode arrays are traversed, and establishing M ellipses;

a plurality of cross sections along the radial direction of the conveying pipeline are selected between two adjacent groups of first electrode arrays on the conveying pipeline, and the intersection point of a single cross section and M ellipses is the installation position of P electrodes in one group of second electrode arrays.

On the basis of the technical scheme, preferably, the number of the second electrode arrays is S groups, wherein S is 8N-2, and N is a positive integer;

the S groups of second electrode arrays are respectively arranged between two adjacent first electrode arrays at intervals.

Further preferably, Z sets of second electrode arrays are uniformly arranged in the first set of first electrode arrays and the second set of first electrode arrays at equal intervals, wherein Z is 4N-1, and N is a positive integer.

Further preferably, the S groups of the second electrode arrays are symmetrically distributed on the inner peripheral wall of the conveying pipeline relative to the second group of the first electrode arrays.

Preferably, the P electrodes in each group of the second electrode arrays are arranged at intervals along the circumferential direction of the inner wall of the conveying pipeline, wherein the P electrodes are divided into M odd-numbered electrodes and M even-numbered electrodes, the electrodes are arranged at intervals in sequence, the intervals between two adjacent odd-numbered electrodes are equal, and the intervals between two adjacent even-numbered electrodes are equal.

In another aspect, the invention provides a three-dimensional liquid-solid two-phase flow detection method based on electrical tomography, which is characterized by comprising the following steps:

s1, sequentially measuring the cross-section conductivity or permittivity distribution of three groups of first electrode arrays and S groups of second electrode arrays by using 1-M electrodes on a first group of first electrode arrays, odd-numbered electrode groups or even-numbered electrode groups on Z groups of second electrode arrays, 1-M electrodes on a second group of first electrode arrays, odd-numbered electrode groups or even-numbered electrode groups on Z groups of second electrode arrays and 1-M electrodes on a third group of first electrode arrays by using an ERT (electrode transfer tomography) technique or an ECT (electro-discharge) technique;

s2, measuring the conductivity or permittivity distribution of the first elliptical section to the Mth elliptical section by adopting an ERT (earth-insulated switchgear) technology or an ECT (electro-discharge technology) technology of the same principle;

and S3, establishing a space coordinate system, if the point is on the measured plane, the conductivity of the point is the conductivity or the permittivity measured by the ERT technology or the ECT technology in the step 2-3, and the conductivity of the point not on the measured plane is calculated by the measured data values around the point by a machine learning mode.

S4, entering the next measuring period.

Compared with the prior art, the three-dimensional liquid-solid two-phase flow detection device based on electrical tomography has the following beneficial effects:

(1) three groups of first electrode arrays with the same structure are arranged on the inner wall of the conveying pipeline at equal intervals, electrodes with the same number in each group of first electrode arrays are arranged oppositely along the axial direction of the inner wall of the conveying pipeline, the end points of the long axis of the ellipse are determined through the first group of first electrode arrays and the third group of first electrode arrays, the end points of the short axis of the ellipse are determined through the second group of first electrode arrays, a plurality of ellipses can be obtained by switching the end points of the long axis of the ellipse and the end points of the short axis of the ellipse, M cross sections along the radial direction of the conveying pipeline are selected between two adjacent groups of first electrode arrays on the conveying pipeline, the intersection point of a single cross section and the M ellipses is the installation position of P electrodes in one group of second electrode arrays, so that each group of second electrode arrays can have different geometric centers of two electrodes on the circumference of the M ellipses, the accuracy of the measurement result is improved, and the purpose of three-dimensional liquid-solid two-phase flow detection based on electrical tomography is realized;

(2) setting the number of the second electrode arrays as S groups, wherein S is 8N-2, and N is a positive integer; z groups of second electrode arrays are uniformly arranged in the first group of first electrode arrays and the second group of first electrode arrays at equal intervals, wherein Z is 4N-1, and N is a positive integer. The S groups of second electrode arrays are symmetrically distributed on the inner peripheral wall of the conveying pipeline relative to the second group of first electrode arrays. Because all the electrodes are symmetrically distributed in the axial direction of the conveying pipeline, the calculation amount can be reduced, and the industrial problem is reduced;

(3) the P electrodes in each group of second electrode arrays are arranged at intervals along the circumferential direction of the inner wall of the conveying pipeline respectively, wherein the P electrodes are divided into M odd electrodes and M even electrodes which are arranged at intervals in sequence, the intervals between every two adjacent odd electrodes are equal, and the intervals between every two adjacent even electrodes are equal, so that the influence of the installation positions between the electrodes in the same group of first electrode arrays on the measurement result can be reduced, the detection result is more accurate, and the calculation amount is less;

(4) the conductivity or permittivity distribution of each space in the conveying pipeline can be obtained by measuring the conductivity or permittivity distribution of the horizontal plane section where the first electrode array and the second electrode array are located and measuring the conductivity or permittivity distribution of the M elliptical sections, and the purpose that the two-dimensional image spans to the three-dimensional image is further achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of a three-dimensional liquid-solid two-phase flow detection device based on electrical tomography according to the present invention;

FIG. 2 is a front view of a three-dimensional liquid-solid two-phase flow detection device based on electrical tomography according to the present invention;

FIG. 3 is a top view of layer A in this example 2;

FIG. 4 is a top view of the layer B in this example 2;

FIG. 5 is an elliptical cross-sectional view of A1 in this example 2;

FIG. 6 is an elliptical cross-sectional view of A2 in this example 2;

fig. 7 is a schematic diagram of scanning using ERT technique in embodiment 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.