A waveguide tube purging method and system

Abstract

This invention discloses a waveguide purging method and system, belonging to the technical field of waveguide purging methods. The waveguide purging method includes preprocessing an image inside the waveguide; acquiring data on the degree of looseness and aggregation and the length of blockages within the waveguide; establishing a fitting function for the opening degree of a solenoid valve based on the aggregation and length data; and calculating the opening degree of the solenoid valve using the fitting function. This invention provides adaptive deblocking based on the degree of looseness and aggregation and the length of blockages within the waveguide, achieving a balance between deblocking effectiveness and energy saving / environmental protection.

Description

Technical Field

[0001] This invention relates to the technical field of waveguide purging methods, and in particular to a waveguide purging method and system. Background Technology

[0002] During boiler operation, pressure changes inside the furnace cause a phenomenon known as "breathing." This phenomenon leads to soot entering the channels with the flue gas. Over time, the soot accumulates and blocks these channels, potentially causing coking. The main cause of coking is the adhesion of molten or semi-molten ash to the heated surfaces, typically forming a loose ash layer. However, as the furnace temperature rises, some ash particles may reach a molten or semi-molten state. Once these particles cool and solidify, they aggregate into a coking substance with strong binding properties. This coking substance not only adheres to more molten or semi-molten ash particles but also adsorbs unburned coal dust, further promoting coking.

[0003] Especially at the end of the waveguide, where it is flush with the furnace wall and has a narrow opening with a high temperature, coking is very likely to occur, and the coking will continue to spread outwards. Some of the waveguides in our furnace tube leak detectors are designed with ordinary steel pipes with a diameter of 50mm, one end of which is extruded into a 10mm narrow slit and welded to the furnace wall. This design of the waveguide, due to the narrow slit, is particularly prone to ash and slag blockage, which in turn affects the normal operation of the furnace tube leak detector and interferes with the operation of the entire furnace tube monitoring system.

[0004] Once coking or ash blockage occurs, cleaning becomes extremely difficult. Attempting to remove the coke with metal rods can damage the equipment on site, and the cleaning workload is enormous. Furthermore, due to the unique installation location of the waveguides in some sensor probes, prolonged use can lead to the accumulation of a large amount of gelatinous material adhering to the inner wall of the waveguide, which is extremely difficult to remove completely. Therefore, a purging device needs to be developed to effectively and conveniently prevent waveguide blockage. This purging device must comprehensively consider the looseness and length of the blockage to provide adaptive deblocking treatment; moreover, continuous purging is energy-intensive and environmentally unfriendly. Summary of the Invention

[0005] In view of the aforementioned existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a waveguide purging method and system to solve the technical problem that current waveguides cannot be purged and unblocked in an adaptive manner after blockage occurs, and are not energy-saving or environmentally friendly.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a waveguide purging method, comprising: preprocessing an image inside the waveguide; acquiring data on the degree of looseness and length of blockages inside the waveguide; establishing a fitting function for the opening degree of a solenoid valve based on the aggregation and length data; and calculating the opening degree of the solenoid valve using the fitting function.

[0009] As a preferred embodiment of the waveguide purging method of the present invention, the waveguide is simulated by cutting it open along the axial direction and unfolding it into a two-dimensional rectangular diagram. The two-dimensional rectangular diagram is divided into m rows and n columns of grids along the axial direction and the circumferential wind direction. The length of each grid is L / m and the width is C / n, where L is the pipe length and C is the unfolded pipe circumference.

[0010] As a preferred embodiment of the waveguide purging method of the present invention, the method includes: acquiring an image of a two-dimensional rectangular diagram of the unfolded waveguide; converting the image of the two-dimensional rectangular diagram into a binary image; analyzing each grid cell; calculating the proportion of blockage pixels in each grid cell to the total number of pixels; and obtaining the blockage percentage of each grid cell. , where i and j are the row and column numbers of the grid, respectively.

[0011] As a preferred embodiment of the waveguide purging method described in this invention, the average value of the proportion of all grid cells is calculated. , represented as:

[0012]

[0013] Calculate the variance of the proportion of blockage , represented as:

[0014]

[0015] Define the degree of loose aggregation as S, where S is the standard deviation σ of the proportion of blockage material, expressed as:

[0016]

[0017] The degree of loose aggregation of blockages is positively correlated with the standard deviation.

[0018] As a preferred embodiment of the waveguide purging method described in this invention, the presence of blockages in each grid is recorded to form an occupancy matrix B. When =1, it indicates that this grid is occupied by blockages. When =0, it indicates that this grid is not occupied by blockages; scan along the length direction of the two-dimensional rectangle, recording the continuous segments occupied by blockages in each row of grids; for each row, confirm the distance between the first occupied grid and the last occupied grid, which is... The blockage length ΔL is the total length of the largest continuously occupied segment in all rows, expressed as:

[0019]

[0020] Where a and b are the start and end column numbers of the continuous blockage segment in each row.

[0021] In a preferred embodiment of the waveguide purging method described in this invention, the fitting function for the solenoid valve opening degree V is expressed as:

[0022]

[0023] Using the least squares method, the fitting parameters are a=-0.02, b=0.80, c=-0.15, d=0.85, and e=0.10. The relationship between the solenoid valve opening degree V, the degree of loosening and aggregation S, and the length of the blockage ΔL is expressed as follows:

[0024]

[0025] Where S represents the degree of loose clustering, L represents the total length of the largest continuously occupied segment in all rows, and a, b, c, d, and e are fitting parameters.

[0026] In a preferred embodiment of the waveguide purging method of the present invention, the opening degree V of the solenoid valve is a function of the applied current I:

[0027]

[0028] Using the least squares method, the fitting parameters k=1.8, c=-0.08 were obtained. The relationship between the opening degree V of the solenoid valve and the applied current I is expressed as:

[0029]

[0030] k is a proportionality constant, and c is the offset.

[0031] Secondly, the present invention provides a waveguide purging system, comprising: an image processing module for preprocessing an image inside the waveguide; an acquisition module for acquiring data on the degree of looseness and length of blockages inside the waveguide using the preprocessed image; and a control module for establishing a fitting function for the opening degree V of a solenoid valve using the looseness and length data, obtaining a predicted value of the opening degree V of the solenoid valve using the fitting function, and determining the current value to be applied to the solenoid valve using the predicted value of the opening degree V of the solenoid valve.

[0032] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, wherein the computer-executable instructions, when executed by the processor, implement the steps of the above-described waveguide purging method.

[0033] Fourthly, the present invention provides a computer-readable storage medium, comprising: storing computer-executable instructions that, when executed by a processor, implement the steps of the waveguide purging method described above.

[0034] The beneficial effects of this invention are: it can adaptively remove blockages based on the degree of looseness and length of the blockages in the waveguide, thus balancing the removal effect with energy saving and environmental protection. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0036] Figure 1 This is a schematic diagram of the waveguide purging system of the present invention.

[0037] Figure 2 This is a wiring diagram of the waveguide purging system of the present invention.

[0038] Figure 3 This is a flowchart of the waveguide purging method of the present invention. Detailed Implementation

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0042] Example 1

[0043] Reference Figure 1 and Figure 3 This embodiment provides a waveguide purging method.

[0044] It is worth noting that while the purge gas removes blockages within the waveguide 100, the looseness and length of these blockages dictate different purge gas flow rates. A common approach involves using a solenoid valve to open or close the pipeline while simultaneously adding a regulating valve to control the purge gas flow rate. This invention eliminates the regulating valve, directly using a solenoid valve for flow rate adjustment. Since the solenoid valve's opening degree is adjustable, the gas flow rate differs depending on the solenoid valve's opening degree.

[0045] S100: First, the image inside the waveguide 100 is preprocessed;

[0046] S200: Next, collect data on the degree of looseness and length of the blockage inside the waveguide 100;

[0047] S300: Then, based on the aggregation degree data and length data, a fitting function for the opening degree of the solenoid valve is established;

[0048] S400: Finally, the opening degree of the solenoid valve is calculated using a fitting function.

[0049] The present invention can adaptively adjust the purge gas entering the waveguide 100 according to the actual situation of the blockage in the waveguide 100, namely the degree of looseness and length of the blockage, and the adjustment is made directly by controlling the opening degree of the solenoid valve, without the need for a regulating valve.

[0050] Example 2

[0051] Reference Figures 1-3 This embodiment is based on Embodiment 1.

[0052] S101: Simulate cutting and unfolding the waveguide 100 into a two-dimensional rectangular diagram along its axial direction. Divide the two-dimensional rectangular diagram into m rows and n columns of grids along its axial and circumferential wind directions. In this embodiment, the inner wall of the waveguide 100 is divided into 100 grids along its length and circumference, arranged in 10 rows and 10 columns. The length of each grid is L / m and the width is C / n, where L is the pipe length and C is the unfolded pipe circumference.

[0053] S102: Obtain the image of the two-dimensional rectangular diagram of the waveguide 100 after unfolding, and convert the image of the two-dimensional rectangular diagram into a binary image; analyze each grid, calculate the proportion of the pixels with blockages in each grid to the total number of pixels, and obtain the proportion of blockages in each grid. , where i and j are the row and column numbers of the grid, respectively.

[0054] S201: Calculate the average percentage of all grid cells. , represented as:

[0055]

[0056] Calculate the variance of the proportion of blockage , represented as:

[0057]

[0058] Define the degree of loose aggregation as S, where S is the standard deviation σ of the proportion of blockage material, expressed as:

[0059]

[0060] The degree of loose aggregation of the blockage, S, is positively correlated with the standard deviation σ.

[0061] S202: Record the presence of blockages in each grid, forming an occupancy matrix B. When... When =1, it indicates that this grid is occupied by blockages. When =0, it indicates that this grid is not occupied by blockages; scan along the length of the 2D rectangle, recording the continuous segments occupied by blockages in each row of grids; for each row, determine the distance between the first occupied grid and the last occupied grid, which is... The blockage length ΔL is the total length of the largest continuously occupied segment in all rows, expressed as:

[0062]

[0063] Where a and b are the start and end column numbers of the continuous blockage segment in each row.

[0064] For example, the sampled data is:

[0065] The grid layout in the third row is: [0, 0, 1, 1, 1, 1, 0, 0, 0, 0]

[0066] The grid layout in the fourth row is: [0, 1, 1, 1, 1, 1, 1, 0, 0, 0]

[0067] The grid layout in the fifth row is: [0, 0, 1, 1, 1, 1, 1, 0, 0, 0]

[0068] The blockage length in the third row is: ΔL = 4 * (L / m)

[0069] The blockage length in the fourth row is: ΔL = 6 * (L / m)

[0070] The blockage length in the fifth row is: ΔL = 5 * (L / m)

[0071] The final length ΔL is taken as the maximum continuous blockage length, which is the length of the fourth row, ΔL = 6 * (L / m).

[0072] S301: The fitting function for the solenoid valve opening degree V, expressed as:

[0073]

[0074] The blockage inside the waveguide 100 was simulated, and experimental data were then collected using the methods described in S201 and S202 above, as follows:

[0075] Data points Degree of loose aggregation of blockage S Blockage length ΔL Solenoid valve opening degree V 1 0.1 0.2 0.25 2 0.3 0.4 0.45 3 0.5 0.6 0.65 4 0.7 0.8 0.85 5 0.9 1.0 1.05 6 0.2 0.3 0.35 7 0.4 0.5 0.55 8 0.8 0.7 0.75

[0076] Using the least squares method, the fitting parameters are a=-0.02, b=0.80, c=-0.15, d=0.85, and e=0.10. The relationship between the solenoid valve opening degree V, the degree of loosening and aggregation S, and the length of the blockage ΔL is expressed as follows:

[0077]

[0078] Where S represents the degree of loose clustering, ΔL represents the total length of the largest continuously occupied segment in all rows, and a, b, c, d, and e are fitting parameters.

[0079] S401: The opening degree V of the solenoid valve is a function of the applied current I:

[0080]

[0081] The experimental data for multiple sets of current I and the corresponding solenoid valve opening degree V are as follows:

[0082] Data points Current I(A) Solenoid valve opening degree V 1 0.1 0.1 2 0.2 0.3 3 0.3 0.5 4 0.4 0.7 5 0.5 0.9

[0083] Using the least squares method, the fitting parameters k=1.8, c=-0.08 were obtained. The relationship between the opening degree V of the solenoid valve and the applied current I is expressed as:

[0084]

[0085] k is a proportionality constant, and c is the offset.

[0086] Example 3

[0087] See Figures 1-3 This embodiment is based on the above embodiment and provides a waveguide purging system.

[0088] Specifically, the waveguide purging system includes an image processing module 200, an acquisition module 300, and a control module 400. The image processing module 200 is used to preprocess the image inside the waveguide 100. The acquisition module 300 is used to acquire data on the degree of looseness and length of the blockage inside the waveguide 100 using the preprocessed image. The control module 400 establishes a fitting function for the opening degree V of the solenoid valve using the looseness and length data, obtains the predicted value of the opening degree V of the solenoid valve using the fitting function, and determines the current value to be applied to the solenoid valve using the predicted value of the opening degree V of the solenoid valve.

[0089] Example 4

[0090] This embodiment provides an electronic device suitable for waveguide purging systems. It includes a memory and a processor; the memory stores computer-executable instructions, and the processor executes these instructions, which, when executed, implement the steps of the waveguide purging method described in the above embodiment.

[0091] Example 5

[0092] This embodiment provides a computer-readable storage medium. It stores computer-executable instructions that, when executed by a processor, implement the steps of the waveguide purging method described above.

[0093] The storage medium proposed in this embodiment and the waveguide purging method proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0094] Based on the above, the beneficial effects of the present invention are as follows:

[0095] 1. The gas flow rate in the waveguide 100 can be directly adjusted by controlling the opening degree of the solenoid valve, without the need for a regulating valve, and the purging gas does not need to be continuously generated, which is more energy-efficient and environmentally friendly.

[0096] 2. Based on the actual situation of the blockage in the waveguide 100, namely the degree of looseness and length of the blockage, the purging gas entering the waveguide 100 is adaptively adjusted, so as to more accurately remove the blockage.

[0097] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method of purging a waveguide, characterized by, The method comprises the following steps: preprocessing the image in the waveguide (100); collecting the loose aggregation degree data and length data of the blockage in the waveguide (100); establishing a fitting function of the opening degree of the electromagnetic valve according to the aggregation degree data and length data; calculating the opening degree of the electromagnetic valve through the fitting function; simulating the waveguide (100) to be cut open along the axial direction and to be developed into a two-dimensional rectangular graph, and dividing the two-dimensional rectangular graph into m rows and n columns of grids along the axial direction and the circumferential direction; the length of each grid is L / m, and the width is C / n, wherein L is the length of the pipeline, and C is the circumference of the developed pipeline; An image of the two-dimensional rectangular graph after the waveguide (100) is unfolded is acquired, and the image of the two-dimensional rectangular graph is converted into a binary image; each grid is analyzed, the proportion of pixel points of the blockage in each grid to total pixel points is calculated, and a blockage proportion of each grid is obtained where i and j are the row and column numbers of the grid, respectively calculating an average of all grid ratios is represented as: Variance of the ratio of the clog is expressed as: defining the loose aggregation degree as S, S is the standard deviation σ of the blockage ratio, and is expressed as: the loose aggregation degree of the blockage is positively correlated with the standard deviation; The presence of the blockage in each grid is recorded to form an occupancy matrix B, where =1 indicates that the grid is occupied by the blockage, and where =0 indicates that the grid is not occupied by the blockage; each row of grids is scanned in the length direction of the two-dimensional rectangular map, and the continuous sections occupied by the blockage in each row of grids are recorded; For each row, the distance between the first occupied grid to the last occupied grid is confirmed, as ; the occlusion length ΔL is the total length of the largest continuous occupied segment in all rows, expressed as: wherein a and b are the starting and ending column numbers of the continuous section of the blockage in each row; the fitting function of the opening degree V of the electromagnetic valve is expressed as: using the least square method to obtain the fitting parameters a=-0.02, b=0.80, c=-0.15, d=0.85, e=0.10, and the relationship between the opening degree V of the electromagnetic valve and the loose aggregation degree S and the length ΔL of the blockage is expressed as: wherein S is the loose aggregation degree, ΔL is the total length of the maximum continuous occupied section in all rows, and a, b, c, d, and e are fitting parameters.

2. The waveguide purging method of claim 1, wherein, the function of the opening degree V of the electromagnetic valve and the current I applied thereto is: using the least square method to obtain the fitting parameters k=1.8, c=-0.08, and the relationship between the opening degree V of the electromagnetic valve and the current I applied thereto is expressed as: k is a proportional constant, and c is an offset.

3. A waveguide purging system for use in the waveguide purging method according to claim 1, characterized in that The method comprises the following steps: an image processing module (200) for preprocessing the image in the waveguide (100); a collection module (300) for collecting the loose aggregation degree data and length data of the blockage in the waveguide (100) through the preprocessed image; a control module (400) for establishing a fitting function of the opening degree V of the electromagnetic valve through the loose aggregation degree and length data, obtaining a predicted value of the opening degree V of the electromagnetic valve through the fitting function, and obtaining the current value required to be applied to the electromagnetic valve through the predicted value of the opening degree V of the electromagnetic valve.

4. An electronic device, comprising: The method comprises the following steps: a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions, and the computer executable instructions are executed by the processor to realize the steps of the waveguide purging method in claim 1 or 2.

5. A computer readable storage medium, characterized in that, The computer executable instructions are stored in the memory, and the computer executable instructions are executed by the processor to realize the steps of the waveguide purging method in claim 1 or 2.

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