A method for measuring and analyzing fluid using an electromagnetic flowmeter

Abstract

The present invention belongs to the technical field of electromagnetic flowmeter fluid measurement and analysis, and specifically discloses a method for electromagnetic flowmeter fluid measurement and analysis, comprising: determining the pipeline process influence rate and the structural process influence rate by analyzing the contour layout length of the straight pipe section before and after the electromagnetic flowmeter and the equipment disturbance source, and analyzing the measurement deviation reference coefficient of the electromagnetic flowmeter based on this; determining whether the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds the standard by identifying the segregation flow state of the complex fluid, and then analyzing the measurement accuracy deviation factor of the electromagnetic flowmeter after exceeding the standard to screen out the key deviation factor; by identifying the flow state of the complex fluid, analyzing the temperature change index and the flow change index of the fluid transported in the electromagnetic flowmeter connecting pipe, and analyzing the scale accumulation function and the deformation accumulation function in the electromagnetic flowmeter connecting pipe, and constructing the measurement accuracy deviation factor of the electromagnetic flowmeter corresponding to the composite effect index array.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic flowmeter fluid measurement and analysis, and relates to an electromagnetic flowmeter fluid measurement and analysis method. Background Art

[0002] As a non-invasive, high-precision flow measurement tool, electromagnetic flowmeter has become the preferred measurement equipment in many industries, including chemical, pharmaceutical, water treatment and food processing, due to its unimpeded flow of fluids, wide range ratio, low pressure loss and adaptability to fluid types (such as corrosive, abrasive or solid-containing liquids).

[0003] However, the measurement accuracy and reliability of traditional electromagnetic flowmeters will be significantly affected when facing complex working conditions, such as partially full pipes, fluids containing a large number of bubbles, solid particles or fibers, etc. These problems limit the application of electromagnetic flowmeters under a wider range of conditions. For example, a partially full pipe state will cause uneven distribution of the fluid in the measurement area, affecting the generation of induced electromotive force; particulate impurities in the fluid may form an insulating layer on the electrode, weakening the signal. In order to overcome these challenges, it is necessary to continuously improve sensor design and optimize signal processing algorithms to improve the adaptability and measurement accuracy of electromagnetic flowmeters under complex working conditions.

[0004] In the prior art, there are also some solutions related to the measurement accuracy of some electromagnetic flowmeters. For example, the invention patent application for an adaptive electromagnetic flowmeter and a measurement method with Chinese patent number CN109900333B provides an electromagnetic flowmeter that can select different excitation modes according to different fluid properties to achieve the purpose of matching the best excitation mode for different fluids to improve their measurement accuracy.

[0005] Although the above scheme proposes some solutions to the accuracy measurement of electromagnetic flowmeters, it still has the following limitations: (1) It is limited to analyzing the impact of the fluid properties in the electromagnetic flowmeter transmission pipeline on the measurement accuracy, and does not fully consider the subtle effects of factors such as the length of the straight pipe section where the electromagnetic flowmeter is installed and the source of equipment disturbance on the measurement results. In addition, the flow state recognition of complex fluids (such as bubbles and solid particles) is insufficient, resulting in inaccurate assessment of measurement deviations.

[0006] (2) Existing technologies may focus on individual factors in analyzing measurement accuracy deviation factors, while ignoring the combined impact of multiple factors, resulting in unscientific screening of key deviation factors, affecting the stability and efficiency of process control, and further limiting the comprehensive understanding and correction of measurement accuracy deviations under non-ideal conditions. Summary of the invention

[0007] In view of this, in order to solve the problems raised in the above background technology, a fluid measurement and analysis method of an electromagnetic flowmeter is now proposed.

[0008] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides an electromagnetic flowmeter fluid measurement and analysis method, the method comprising the following steps: A1, obtaining the installation status of the electromagnetic flowmeter, analyzing the pipeline process influence rate and structural process influence rate of the electromagnetic flowmeter, and determining the measurement deviation reference coefficient of the electromagnetic flowmeter.

[0009] A2. Obtain the induced electromotive force of the electromagnetic field in the connecting pipe of the electromagnetic flowmeter, and identify whether the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is symmetrical and balanced. When the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is not symmetrical and balanced, obtain the measurement deviation evaluation coefficient of the electromagnetic flowmeter.

[0010] A3. Compare the measurement deviation evaluation coefficient of the electromagnetic flowmeter with its measurement deviation reference coefficient. When the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds its measurement deviation reference coefficient, analyze the temperature change index temp of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period.

[0011] A4. Take the two electrodes of the upper and lower excitation magnetic coils of the electromagnetic flowmeter as symmetrical points, and the connecting line of the two poles as the dividing line, divide the connecting pipe into equally symmetrical half-pipe areas, and analyze the liquidity change index of the fluid transported in the connecting pipe of the electromagnetic flowmeter.

[0012] A5. Analyze the scale accumulation function s_r and deformation accumulation function d_r in the connecting pipe of the electromagnetic flowmeter.

[0013] A6. Analyze the measurement accuracy deviation factors of the electromagnetic flowmeter. The measurement accuracy deviation factors include temperature factors, flow factors, and other factors. When the measurement deviation evaluation coefficient of the electromagnetic flowmeter does not exceed its measurement deviation reference coefficient, the key deviation factors of the electromagnetic flowmeter's measurement accuracy are fed back as other factors.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention determines the pipeline process influence rate of the electromagnetic flowmeter by analyzing the contour layout length of the straight pipe section before and after the electromagnetic flowmeter and the equipment disturbance source, and analyzes the structural process influence rate of the electromagnetic flowmeter. Based on this, the measurement deviation reference coefficient of the electromagnetic flowmeter is determined, which can quantify the error range of the electromagnetic flowmeter under specific operating conditions, which helps users understand and correct the measurement values.

[0015] (2) The present invention determines whether the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds the standard by identifying whether the fluid flow distribution in the electromagnetic flowmeter connecting pipe is symmetrical and balanced, and then analyzes the measurement accuracy deviation factors of the electromagnetic flowmeter after exceeding the standard to screen out key deviation factors, which helps to reduce the measurement deviation of the electromagnetic flowmeter, thereby improving the stability and efficiency of process control, ultimately improving product quality and output, and reducing maintenance frequency and cost.

[0016] (3) The present invention identifies the segregation flow state of complex fluids (such as fluids containing bubbles and solid particles) to analyze the temperature change index and flow change index of the fluid transported in the electromagnetic flowmeter connecting pipe, and analyzes the scale accumulation function and deformation accumulation function in the electromagnetic flowmeter connecting pipe based on the installation inclination of the electromagnetic flowmeter, thereby constructing an array of composite effect indicators corresponding to the measurement accuracy deviation factors of the electromagnetic flowmeter, which can reveal the response of the electromagnetic flowmeter under non-ideal conditions, thereby more accurately correcting the measurement results and improving the overall accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 The present invention is a schematic flow chart of the steps for implementing the method.

[0019] Figure 2 It is a schematic diagram of the equally symmetrical half-pipe area division of the present invention.

[0020] Figure 3 It is a schematic diagram of the inclination angle of the pipeline where the electromagnetic flowmeter of the present invention is installed relative to the horizontal direction.

[0021] Figure numerals: 1 is two electrodes, 2 is an electromagnetic flowmeter, ① and ② are upper and lower excitation magnetic coils, I1 and I2 are excitation currents of the same value. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1As shown, the present invention provides an electromagnetic flowmeter fluid measurement and analysis method, which includes the following steps: A1, obtaining the installation status of the electromagnetic flowmeter, analyzing the pipeline process influence rate and structural process influence rate of the electromagnetic flowmeter, and determining the measurement deviation reference coefficient of the electromagnetic flowmeter.

[0024] In a preferred embodiment, the determination of the measurement deviation reference coefficient of the electromagnetic flowmeter includes: obtaining the connection installation contour diagram of the front and rear straight pipe sections of the electromagnetic flowmeter, extracting the corresponding connection contours of the front and rear straight pipe sections of the electromagnetic flowmeter, taking the installation position of the electromagnetic flowmeter as the vertex, and obtaining the angle of the corresponding connection contours of the front and rear straight pipe sections. And extract the pipe cross-section diameter D and the lengths L1 and L2 of the front and rear straight pipe sections.

[0025] From the connection installation outline of the front and rear straight pipe sections of the electromagnetic flowmeter, identify whether there is a flow disturbance source upstream of the front straight pipe section, such as an elbow, valve, tee or reducer. If there is a flow disturbance source, extract the distance length L' between the flow disturbance source and the electromagnetic flowmeter, and determine the reference length of the front straight pipe section based on this. And the reference length of the straight pipe section after L′2=y*D, where B1 indicates that there is no flow disturbance source upstream of the front straight pipe section, B2 indicates that there is a flow disturbance source upstream of the front straight pipe section, χ indicates a set constant, such as χ=5, χ1 indicates a set multiple of the flow disturbance source corresponding to the rated length, such as χ1=15, χ0 indicates a preset reduction multiple of the unit distance length between the flow disturbance source and the electromagnetic flowmeter, such as χ0=0.5, and y indicates a set constant, such as y=8.

[0026] Specifically, the upstream of the front straight pipe section refers to the direction of the pipe section where the conveying fluid flows from the inlet position to the installation position of the electromagnetic flowmeter. Since the straight pipe section length that does not meet the requirements will lead to poor fluid flow conditions, such as unstable flow, eddy currents or swirls, which will affect the accuracy and repeatability of the measurement, it is necessary to perform installation analysis on the straight pipe section length.

[0027] From the connection installation outline diagram of the straight pipe sections before and after the electromagnetic flowmeter, the magnetic field interference equipment near the installation location of the electromagnetic flowmeter, such as motors and transformers, is identified, and the distance length L between the magnetic field interference equipment and the installation location of the electromagnetic flowmeter and its operating intensity E are extracted.

[0028] The operation intensity of the magnetic field interference device is extracted from the device operation management platform.

[0029] Analysis of the pipeline process influence rate of electromagnetic flowmeter Where E0 is the reference operating intensity of the preset magnetic field interference equipment, c1, c2, and c3 are the connection profile angle of the front and rear straight pipe sections, the layout distance length, and the operating intensity of the magnetic field interference equipment corresponding to the influence ratio of the pipeline process setting, respectively. It represents the reference angle of the connection contour corresponding to the front and rear straight pipe sections, and L0 represents the reference distance length between the magnetic field interference equipment and the installation position of the electromagnetic flowmeter.

[0030] Analysis of the structural process influence rate of electromagnetic flowmeterγ b Based on this, the measurement deviation reference coefficient f(γ a ,γ b ), f(γ a ,γ b )=β a *γ a +β b *γ b , where β a , β b The influence weight coefficients are set correspondingly for the pipeline process influence rate and the structural process influence rate of the electromagnetic flowmeter.

[0031] In a further preferred embodiment, the analysis of the structural process impact rate of the electromagnetic flowmeter specifically includes: scanning and acquiring the installation structure image of the electromagnetic flowmeter, and automatically extracting the hierarchical feature area of ​​the connection part between the electromagnetic flowmeter and the pipeline in the image through multi-layer convolution and pooling operations, wherein the hierarchical feature area includes the texture area of ​​features such as cracks, wear, and corrosion, and obtaining the comparison ratio thereof with the preset reference feature area, which is recorded as the structural process impact rate of the electromagnetic flowmeter.

[0032] The present invention determines the pipeline process influence rate of the electromagnetic flowmeter by analyzing the contour layout length of the straight pipe sections before and after the electromagnetic flowmeter and the equipment disturbance source, and analyzes the structural process influence rate of the electromagnetic flowmeter. Based on this, the measurement deviation reference coefficient of the electromagnetic flowmeter is determined, and the error range of the electromagnetic flowmeter under specific operating conditions can be quantified, which is helpful for users to understand and correct the measurement values.

[0033] A2. Obtain the induced electromotive force of the electromagnetic field in the connecting pipe of the electromagnetic flowmeter, and identify whether the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is symmetrical and balanced. When the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is not symmetrical and balanced, obtain the measurement deviation evaluation coefficient of the electromagnetic flowmeter f0 = △ε*|U1-U2|, where △ε is the measurement deviation evaluation coefficient corresponding to the preset unit deviation potential.

[0034] In a preferred embodiment, the identification of whether the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is symmetrical and balanced is specifically as follows: wires are led out from the upper and lower excitation magnetic coils of the electromagnetic flowmeter respectively, and excitation currents of the same value flow in the two upper and lower excitation coils at the same time and in phase, and the induced electromotive force U1 and U2 generated on the two electrodes are detected. If U1≠U2, the flow distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is not symmetrical and balanced.

[0035] A3. Compare the measurement deviation evaluation coefficient of the electromagnetic flowmeter with its measurement deviation reference coefficient. If the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds its measurement deviation reference coefficient, analyze the temperature change index temp of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period.

[0036] In a preferred embodiment, the temperature change index of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period is analyzed as follows: the temperature T corresponding to each pointing time of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period is detected by a temperature sensor. u , determine the temperature change index of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period Where T (u+1) is the temperature of the fluid transported in the electromagnetic flowmeter connecting pipe corresponding to the u+1th pointing time in the set cycle detection period, △T is the reference floating temperature corresponding to the two preset pointing times, u is the number of the pointing time, u=1,2,…,c, c is the number of the pointing time.

[0037] See also Figure 2 As shown, A4, taking the two electrodes of the upper and lower excitation magnetic coils of the electromagnetic flowmeter as symmetrical points, and the connecting line of the two poles as the dividing line, the connecting pipe is divided into equally symmetrical half-pipe areas, and the liquidity change index of the fluid transported in the connecting pipe of the electromagnetic flowmeter is analyzed.

[0038] In a preferred embodiment, the process of analyzing the flow change index of the fluid transported in the electromagnetic flowmeter connecting pipe is as follows: by using image detection technology (such as particle image velocimetry, X-ray tomography, etc.) at specified intervals, a flow image atlas of the fluid transported in the electromagnetic flowmeter connecting pipe in a set period detection period is obtained, based on preset bubble, solid particle and fiber corresponding feature textures, the bubble amount, solid particle content and fiber content in each flow image of the fluid transported in the electromagnetic flowmeter connecting pipe in the set period detection period are extracted, and then the bubble amount, solid particle content and fiber content in each flow image of the symmetrical half-pipe area of ​​the fluid transported in the electromagnetic flowmeter connecting pipe are obtained, and the two sides of the symmetrical half-pipe area are subtracted from each other, and the bubble segregation content, solid particle segregation content and fiber segregation content of the fluid transported in the electromagnetic flowmeter connecting pipe in each flow image are obtained, and then the average value is taken as the unit bubble segregation amount, unit solid particle segregation amount and unit fiber segregation amount of the fluid transported in the electromagnetic flowmeter connecting pipe, which are respectively recorded as bv, so, and fi, to evaluate the signal interference factor of the fluid property on the electromagnetic flowmeter Wherein bv′, so′, fi′ represent the preset reference bubble segregation amount, reference solid particle segregation amount and reference fiber segregation amount, respectively, and exp() represents an exponential function with the natural constant e as the base.

[0039] The solid particles may include sand, dust, metal debris, mineral particles or other hard impurities. In certain industrial processes, such as mining, oil and gas, chemicals and water treatment industries, solid particles carried in the fluid are a common phenomenon.

[0040] The fibers may be pulp fibers, textile fibers, vegetable fibers, synthetic fibers or any other type of fibrous material. Such fibers may be present in fluids in industries such as papermaking, textiles, food processing and pharmaceuticals.

[0041] Obtain the delivery speed d of the fluid in the electromagnetic flowmeter connecting pipe at each directional time in the set period detection period from the fluid delivery port u , and then identify the flow velocity uniformity of the fluid transported in the electromagnetic flowmeter connecting pipe d0 is the preset reference conveying speed, and the full pipe deviation compensation factor h of the electromagnetic flowmeter connecting pipe is determined, based on which the flow property change index of the conveying fluid in the electromagnetic flowmeter connecting pipe is analyzed. Wherein λ′ is the preset reference signal interference factor, σ′ is the preset reference flow velocity uniformity, and e is a natural constant.

[0042] Specifically, the process of determining the full pipe deviation compensation factor of the electromagnetic flowmeter connecting pipe is as follows: obtain the inclination angle of the pipeline where the electromagnetic flowmeter is installed relative to the horizontal direction, match it with the fluid full pipe deviation compensation factors corresponding to each preset inclination angle, and obtain the fluid full pipe deviation compensation factor of the electromagnetic flowmeter connecting pipe.

[0043] A5. Analyze the scale accumulation function s_r and deformation accumulation function d_r in the connecting pipe of the electromagnetic flowmeter.

[0044] See also Figure 3 As shown, in a preferred embodiment, the analysis of the fouling accumulation function in the electromagnetic flowmeter connecting pipe is specifically as follows: extracting the inner wall contour model of the electromagnetic flowmeter connecting pipe in each flow image image from the flow image image collection of the fluid transported in the electromagnetic flowmeter connecting pipe in a set periodic detection period, comparing it with the preset standard contour model of the electromagnetic flowmeter, identifying the inner wall fouling contour volume of the electromagnetic flowmeter connecting pipe in each flow image image, and comparing the inner wall fouling contour volumes of the electromagnetic flowmeter connecting pipe in each flow image image with each other, obtaining the inner wall fouling contour volume growth of the electromagnetic flowmeter connecting pipe between all adjacent flow image images, taking the average value and comparing it with the preset reference fouling accumulation volume between two flow image images, and recording the comparison ratio as the unit time accumulation scale △H of fouling on the electromagnetic flowmeter connecting pipe.

[0045] Get the inclination angle of the pipeline where the electromagnetic flowmeter is installed relative to the horizontal direction The flow direction of the fluid in the pipeline is obtained. The flow direction of the fluid in the pipeline includes flowing from low to high, flowing from high to low, and flowing horizontally. It is matched with the preset weights of the fouling tendency corresponding to each flow direction to obtain the weight q of the fouling tendency corresponding to the flow direction of the fluid in the pipeline, and the sediment wall tendency coefficient of the electromagnetic flowmeter connecting pipe is predicted. π is 180 degrees.

[0046] Analysis of scale accumulation function in electromagnetic flowmeter connecting pipe Where J0 is the inner wall fouling contour volume corresponding to the end time of the set period detection period, and J′ is the preset fouling contour volume capacity.

[0047] In a further preferred embodiment, the deformation accumulation function is obtained as follows: according to the hierarchical characteristic area acquisition method of the connection part between the electromagnetic flowmeter and the pipeline, the hierarchical characteristic area of ​​the inner wall of the electromagnetic flowmeter connecting pipe in each flow image diagram is obtained in the same way, and then the comparison ratio between the inner wall and the preset reference characteristic area is obtained to obtain the structural process damage influence rate of the inner wall of the electromagnetic flowmeter connecting pipe in each flow image diagram, and the maximum and minimum values ​​are screened out and recorded as V max 、V min .

[0048] Analysis of the wear tendency coefficient of the fluid transported in the electromagnetic flowmeter connecting pipe on the pipe wall Based on this, the deformation accumulation function of the electromagnetic flowmeter connecting pipe is determined △V represents the preset reference cumulative measurement corresponding to the structural process damage impact rate.

[0049] In a further preferred embodiment, the corresponding method for analyzing the wear tendency coefficient of the fluid transported in the electromagnetic flowmeter connecting pipe on the pipe wall is: obtaining various physical properties of the fluid transported in the electromagnetic flowmeter connecting pipe from the fluid delivery port, such as viscosity, roughness, pressure, etc., and obtaining the ratio of the ratio to the preset reference value corresponding to each physical property, and then solving the mean to obtain the friction indication of the fluid transported in the electromagnetic flowmeter connecting pipe.

[0050] The flow property change index of the fluid transported in the electromagnetic flowmeter connecting pipe is used as the flow property change trend factor of the fluid transported in the electromagnetic flowmeter connecting pipe during the set periodic detection period, and the corresponding product of the flow property change index and the friction indicator of the fluid transported in the electromagnetic flowmeter connecting pipe is obtained. Based on this, the wear tendency coefficient of the fluid transported in the electromagnetic flowmeter connecting pipe on the pipe wall is analyzed.

[0051] A6. Analyze the measurement accuracy deviation factors of the electromagnetic flowmeter. The measurement accuracy deviation factors include temperature factors, flow factors, and other factors. When the measurement deviation evaluation coefficient of the electromagnetic flowmeter does not exceed its measurement deviation reference coefficient, the key deviation factors of the electromagnetic flowmeter's measurement accuracy are fed back as other factors.

[0052] In a preferred embodiment, the analysis of the measurement accuracy deviation factors of the electromagnetic flowmeter is specifically as follows: constructing a composite effect index array corresponding to the measurement accuracy deviation factors of the electromagnetic flowmeter Wherein g1 represents the composite effect index of temperature factor on the scale accumulation function and deformation accumulation function in the connecting pipe of electromagnetic flowmeter, and g2 represents the composite effect index of flow factor on the scale accumulation function and deformation accumulation function in the connecting pipe of electromagnetic flowmeter.

[0053] Furthermore, the function of the element of the composite effect index array corresponding to the measurement accuracy deviation factor of the electromagnetic flowmeter is fed back. The elements of the composite effect index array corresponding to the measurement accuracy deviation factor of the electromagnetic flowmeter are compared with each other, and the measurement accuracy deviation factor of the maximum value of the composite effect index is selected as the key deviation factor of the electromagnetic flowmeter fluid measurement accuracy.

[0054] The element functions refer to arr[g1]=temp*s_r+liquidity*d_r and arr[g2]=liquidity*s_r+temp*d_r.

[0055] The present invention analyzes the temperature change index and flow change index of the fluid transported in the electromagnetic flowmeter connecting pipe by identifying the segregation flow state of complex fluids (such as fluids containing bubbles and solid particles), and analyzes the scale accumulation function and deformation accumulation function in the electromagnetic flowmeter connecting pipe based on the installation inclination of the electromagnetic flowmeter, and constructs a composite effect index array corresponding to the measurement accuracy deviation factor of the electromagnetic flowmeter, which can reveal the response of the electromagnetic flowmeter under non-ideal conditions, so as to more accurately correct the measurement results and improve the overall accuracy. In addition, the present invention determines whether the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds the standard by identifying whether the flow state distribution of the fluid in the electromagnetic flowmeter connecting pipe is symmetrical and balanced, and then analyzes the measurement accuracy deviation factors of the electromagnetic flowmeter after exceeding the standard, so as to screen out the key deviation factors, which helps to reduce the measurement deviation of the electromagnetic flowmeter, and then improve the stability and efficiency of process control, and ultimately improve product quality and output, and reduce maintenance frequency and cost.

[0056] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A method for measuring and analyzing fluid using an electromagnetic flowmeter, characterized in that: The method comprises the following steps: A1. Obtain the installation status of the electromagnetic flowmeter, analyze the pipeline process influence rate and structural process influence rate of the electromagnetic flowmeter, and determine the measurement deviation reference coefficient of the electromagnetic flowmeter; A2. Obtain the induced electromotive force of the electromagnetic field in the connecting pipe of the electromagnetic flowmeter, identify whether the flow pattern distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is symmetrical and balanced, and when the flow pattern distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is not symmetrical and balanced, obtain the measurement deviation evaluation coefficient of the electromagnetic flowmeter; A3. Compare the measurement deviation evaluation coefficient of the electromagnetic flowmeter with its measurement deviation reference coefficient. When the measurement deviation evaluation coefficient of the electromagnetic flowmeter exceeds its measurement deviation reference coefficient, analyze the temperature change index temp of the conveying fluid in the electromagnetic flowmeter connecting pipe during the set period detection period. A4. Take the two electrodes of the upper and lower excitation magnetic coils of the electromagnetic flowmeter as symmetrical points, and the connecting line of the two electrodes as the dividing line, divide the connecting pipe into equally symmetrical half-pipe areas, and analyze the liquidity change index of the fluid transported in the connecting pipe of the electromagnetic flowmeter; A5. Analyze the scale accumulation function and deformation accumulation function in the connecting pipe of the electromagnetic flowmeter; A6. Analyze the measurement accuracy deviation factors of the electromagnetic flowmeter. The measurement accuracy deviation factors include temperature factors, flow factors, and other factors.

2. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The method for determining the measurement deviation reference coefficient of the electromagnetic flowmeter includes: obtaining a connection installation contour diagram of the front and rear straight pipe sections of the electromagnetic flowmeter, extracting the corresponding connection contours of the front and rear straight pipe sections of the electromagnetic flowmeter, taking the installation position of the electromagnetic flowmeter as the vertex, obtaining the angle θ of the corresponding connection contours of the front and rear straight pipe sections, and extracting the pipe section diameter D and the lengths L1 and L2 of the front and rear straight pipe sections; Identify whether there is a flow disturbance source upstream of the front straight pipe section. If there is a flow disturbance source, extract the distance length L' between the flow disturbance source and the electromagnetic flowmeter, and determine the reference length of the front straight pipe section based on this. and the reference length of the straight pipe section after L′2=y*D, where B1 indicates that there is no flow disturbance source upstream of the straight pipe section, B2 indicates that there is a flow disturbance source upstream of the straight pipe section, χ indicates a set constant, χ1 indicates a set multiple of the flow disturbance source corresponding to the rated length, χ0 indicates a preset reduction multiple corresponding to the unit distance length between the flow disturbance source and the electromagnetic flowmeter, and y indicates a set constant; Identify the magnetic field interference equipment near the installation location of the electromagnetic flowmeter, and extract the distance length L between the magnetic field interference equipment and the installation location of the electromagnetic flowmeter and its operating intensity E; Analysis of the pipeline process influence rate of electromagnetic flowmeter Where E0 is the preset reference operating intensity of the magnetic field interference equipment, c1, c2, and c3 are the connection contour angle of the front and rear straight pipe sections, the layout distance length, and the influence ratio of the operation intensity of the magnetic field interference equipment corresponding to the pipeline process setting, θ0 represents the reference angle of the connection contour of the front and rear straight pipe sections, and L0 represents the reference distance length between the magnetic field interference equipment and the installation position of the electromagnetic flowmeter; Analysis of the structural process influence rate of electromagnetic flowmeterγ b Based on this, the measurement deviation reference coefficient f(γ a ,γ b ).

3. The electromagnetic flowmeter fluid measurement and analysis method according to claim 2, characterized in that: The analysis of the structural process influence rate of the electromagnetic flowmeter specifically includes: scanning to obtain the installation structure image of the electromagnetic flowmeter, extracting the hierarchical feature area of ​​the connection part between the electromagnetic flowmeter and the pipeline in the image, and obtaining the comparison ratio between the hierarchical feature area and the preset reference feature area, which is recorded as the structural process influence rate of the electromagnetic flowmeter.

4. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The method for identifying whether the flow pattern distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is symmetrical and balanced is specifically as follows: wires are led out from the upper and lower excitation magnetic coils of the electromagnetic flowmeter respectively, and excitation currents of the same value flow in the two upper and lower excitation coils at the same time and in phase, and the induced electromotive force U1 and U2 generated on the two electrodes are detected. If U1≠U2, the flow pattern distribution of the fluid in the connecting pipe of the electromagnetic flowmeter is not symmetrical and balanced.

5. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The content of analyzing the temperature change index of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period is as follows: the temperature T corresponding to each pointing time of the fluid transported in the electromagnetic flowmeter connecting pipe corresponding to the set period detection period is detected by the temperature sensor. u , determine the temperature change index of the fluid transported in the electromagnetic flowmeter connecting pipe during the set period detection period Where T (u+1) is the temperature of the fluid transported in the electromagnetic flowmeter connecting pipe corresponding to the u+1th pointing time in the set cycle detection period, ΔT is the reference floating temperature corresponding to the two preset pointing times, u is the number of the pointing time, u=1,2,...,c, c is the number of the pointing time.

6. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The analysis of the flow property change index of the fluid transported in the electromagnetic flowmeter connecting pipe is as follows: obtaining a flow image atlas of the fluid transported in the electromagnetic flowmeter connecting pipe in a set period detection period at a specified interval, extracting the bubble amount, solid particle content and fiber content in each flow image of the fluid transported in the electromagnetic flowmeter connecting pipe in the set period detection period, and then obtaining the unit bubble segregation amount, unit solid particle segregation amount and unit fiber segregation amount of the fluid transported in the electromagnetic flowmeter connecting pipe, and evaluating the signal interference factor of the fluid property on the electromagnetic flowmeter; Identify the flow velocity uniformity of the fluid transported in the electromagnetic flowmeter connecting pipe, and determine the full pipe deviation compensation factor of the electromagnetic flowmeter connecting pipe, based on which analyze the flow property change index of the fluid transported in the electromagnetic flowmeter connecting pipe.

7. The electromagnetic flowmeter fluid measurement and analysis method according to claim 6, characterized in that: The analysis of the fouling accumulation function in the electromagnetic flowmeter connecting pipe is specifically as follows: extracting the inner wall contour model of the electromagnetic flowmeter connecting pipe in each flow image diagram, comparing it with the preset standard contour model of the electromagnetic flowmeter, identifying the contour volume of the inner wall fouling of the electromagnetic flowmeter connecting pipe in each flow image diagram, and determining the unit time accumulation scale ΔH of the fouling on the electromagnetic flowmeter connecting pipe accordingly; Obtain the inclination angle of the pipeline where the electromagnetic flowmeter is installed relative to the horizontal direction, and obtain the weight of the fouling tendency corresponding to the flow direction of the fluid in the pipeline, and predict the sediment wall tendency coefficient φ of the electromagnetic flowmeter connecting pipe; Analysis of scale accumulation function in electromagnetic flowmeter connecting pipe Where J0 is the inner wall fouling contour volume corresponding to the end time of the set period detection period, and J′ is the preset fouling contour volume capacity.

8. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The deformation cumulative function is obtained as follows: the structural process damage influence rate of the inner wall of the electromagnetic flowmeter connecting pipe in each flow image diagram is obtained, the maximum and minimum values ​​are screened out, and the wear tendency coefficient of the conveyed fluid in the electromagnetic flowmeter connecting pipe on the pipe wall is analyzed, and then the deformation cumulative function of the electromagnetic flowmeter connecting pipe is determined according to the above indicators.

9. The electromagnetic flowmeter fluid measurement and analysis method according to claim 8, characterized in that: The corresponding method for analyzing the wear tendency coefficient of the fluid transported in the electromagnetic flowmeter connecting pipe on the pipe wall is: obtaining various physical properties of the fluid transported in the electromagnetic flowmeter connecting pipe, and analyzing the friction indication of the fluid transported in the electromagnetic flowmeter connecting pipe based on the physical properties; The flow property change index of the fluid transported in the electromagnetic flowmeter connecting pipe is used as the flow property change trend factor of the fluid transported in the electromagnetic flowmeter connecting pipe in the set period detection period, and then the wear trend coefficient of the fluid transported in the electromagnetic flowmeter connecting pipe on the pipe wall is analyzed.

10. The electromagnetic flowmeter fluid measurement and analysis method according to claim 1, characterized in that: The specific analysis of the measurement accuracy deviation factors of the electromagnetic flowmeter is as follows: constructing a composite effect index array corresponding to the measurement accuracy deviation factors of the electromagnetic flowmeter Wherein g1 represents the composite effect index of temperature factor on the scale accumulation function and deformation accumulation function in the connecting pipe of electromagnetic flowmeter, and g2 represents the composite effect index of flow factor on the scale accumulation function and deformation accumulation function in the connecting pipe of electromagnetic flowmeter.

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