Wave guide purging method and system

Abstract

The invention discloses a waveguide purging method and system, and belongs to the technical field of waveguide purging methods, and the waveguide purging method comprises the steps: carrying out the preprocessing of an image in a waveguide; collecting loose aggregation degree data and length data of blockages in the waveguide; establishing a fitting function of the opening degree of the electromagnetic valve according to the aggregation degree data and the length data; and the opening degree of the electromagnetic valve is calculated through the fitting function. According to the unblocking device, adaptive unblocking is carried out according to the loose gathering degree and length of blockages in the waveguide, the unblocking effect can be balanced, and energy conservation and environmental protection can be achieved.

Description

Technical Field

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

[0002] During boiler operation, pressure changes inside the furnace cause the so-called "breathing" effect, which causes the soot inside the furnace to enter the channel with the flue gas. Over time, the soot will gradually accumulate in the channel and cause blockage, which may eventually lead to coking. The main cause of coking is that the ash in a molten or semi-molten state adheres to the heating surface. Usually, this forms a loose ash layer. However, when the temperature in the furnace rises, some ash particles may reach a molten or semi-molten state. Once these particles cool and solidify, they will aggregate into coking materials with strong bonding force. This coking material can not only adhere to more molten or semi-molten ash particles, but also absorb incompletely burned coal powder, thereby further expanding the coking phenomenon.

[0003] Especially at the end of the waveguide, because it is flush with the inner wall of the furnace, has a narrow opening, and has a high temperature, it is very easy to coke, and the coke will continue to spread outward. The waveguide design of some furnace tube leakage detectors in our factory uses an ordinary steel pipe with a diameter of 50mm, one end of which is extruded into a narrow slit of 10mm and welded to the furnace wall. Due to the existence of the narrow slit, the waveguide of this design is particularly prone to ash clogging, which in turn affects the normal operation of the furnace tube leakage 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 use a metal rod to remove coke may cause damage to on-site equipment, and the amount of cleaning work is extremely large. In addition, due to the special installation position of the waveguide of some sensor probes, a large amount of colloidal substances may accumulate inside the waveguide and adhere to the inner wall after long-term use. These substances are extremely difficult to completely remove. Therefore, it is necessary to develop a purge device that can effectively and conveniently prevent the waveguide from being blocked. The purge device needs to comprehensively consider the looseness and length of the blockage and make adaptive deblocking treatment; and if the purge device is always purging, the energy consumption is high and it is not environmentally friendly. Summary of the invention

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

[0006] Therefore, the present invention provides a waveguide purging method and system for solving the technical problems that the waveguide cannot be purged adaptively after blockage occurs and the purging is not energy-saving and environmentally friendly.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

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

[0009] As a preferred embodiment of the waveguide purging method of the present invention, the waveguide is simulated cut along its axial direction and unfolded into a two-dimensional rectangular diagram, and is equally divided into m rows and n columns of grids along the axial direction and circumferential wind direction of the two-dimensional rectangular diagram; 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 pipeline after unfolding.

[0010] As a preferred solution of the waveguide purging method of the present invention, the following steps are performed: obtaining an image of a two-dimensional rectangular image of the waveguide after expansion, and converting the image of the two-dimensional rectangular image into a binary image; analyzing each grid, calculating the proportion of the pixel points of the blockage in each grid to the total pixel points, and obtaining the blockage proportion p of each grid. ij , where i and j are the row and column numbers of the grid, respectively.

[0011] As a preferred embodiment of the waveguide purging method of the present invention, the average value of all grid proportions is calculated. It is expressed as:

[0012]

[0013] Calculate the variance σ of the blockage ratio 2 , expressed as:

[0014]

[0015] The loose aggregation degree is defined as S, where S is the standard deviation σ of the blockage ratio, expressed as:

[0016]

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

[0018] As a preferred solution of the waveguide purging method of the present invention, the existence of the blockage in each grid is recorded to form an occupancy matrix B. ij =1, indicating that this grid is occupied by a blockage. ij= 0, it means that this grid is not occupied by the obstruction; scan one by one along the length direction of the two-dimensional rectangular diagram, and record the continuous sections occupied by the obstruction in each row of grids; for each row, confirm the distance between the first occupied grid and the last occupied grid, which is l i ; The blockage length ΔL is the total length of the largest continuous occupied segments in all rows, expressed as:

[0019]

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

[0021] As a preferred solution of the waveguide purging method of the present invention, the fitting function of the solenoid valve opening degree V is expressed as:

[0022] V=aS 2 +bS+cL 2 +dL+e

[0023] The least squares method was used to obtain the fitting parameters a=-0.02, b=0.80, c=-0.15, d=0.85, e=0.10. The relationship between the solenoid valve opening degree V and the loose aggregation degree S and the blockage length L is expressed as follows:

[0024] V=-0.02S 2 +0.80S-0.15L 2 +0.85L+0.10

[0025] Among them, S is the degree of loose aggregation, L is the total length of the largest continuous occupied segments in all rows, and a, b, c, d, and e are fitting parameters.

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

[0027] V=kI+c

[0028] The fitting parameters k=1.8 and c=-0.08 are obtained by using the least square method. The relationship between the opening degree V of the solenoid valve and the current I applied to it is expressed as:

[0029] V=1.8I-0.08

[0030] k is the proportional constant and c is the offset.

[0031] In a second aspect, the present invention provides a waveguide purging system, comprising: an image processing module for preprocessing images in the waveguide; an acquisition module for acquiring loose aggregation degree data and length data of blockages in the waveguide through the preprocessed images; a control module for establishing a fitting function of the solenoid valve opening degree V through the loose aggregation degree and length data, and obtaining a predicted value of the solenoid valve opening degree V through the fitting function, and obtaining a current value that needs to be applied to the solenoid valve through the predicted value of the solenoid valve opening degree V.

[0032] In a third aspect, 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, which, when executed by the processor, implement the steps of the above-mentioned waveguide purging method.

[0033] In a fourth aspect, the present invention provides a computer-readable storage medium, comprising: storing computer-executable instructions, which, when executed by a processor, implement the steps of the above-mentioned waveguide purging method.

[0034] The beneficial effects of the present invention are as follows: the present invention can adaptively remove the blockage according to the loose aggregation degree and length of the blockage in the waveguide, and can balance the blockage removal effect and energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0036] Figure 1 Schematic diagram of the waveguide purge system of the present invention.

[0037] Figure 2 It is a wiring block diagram of the waveguide purge system of the present invention.

[0038] Figure 3 The figure is a flow chart of the waveguide purging method of the present invention. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with 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 the blockage in the waveguide 100 is cleared by purging gas, and the loose aggregation degree and length of the blockage in the waveguide 100 have different requirements for the flow rate of the purging gas. A common treatment method is to use a solenoid valve to open or close the pipeline and add an additional regulating valve to control the flow rate of the purging gas. The present invention omits the regulating valve and directly uses the solenoid valve to adjust the flow rate, because the opening degree of the solenoid valve itself is adjustable, and the flow rate of the gas after passing through the solenoid valves with different openings is different.

[0045] S100: first pre-processing the image in the waveguide 100;

[0046] S200: secondly, collecting the loose aggregation degree data and length data of the blockage in the waveguide 100;

[0047] S300: then establishing a fitting function of the opening degree of the solenoid valve according to the aggregation degree data and the length data;

[0048] S400: Finally, the opening degree of the solenoid valve is calculated through the 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, i.e., the loose aggregation degree and length of the blockage, and directly adjusts the purge gas by controlling the opening degree of the solenoid valve without the need for a regulating valve.

[0050] Example 2

[0051] Reference Figure 1 to Figure 3 , this embodiment is based on embodiment 1.

[0052] S101: The waveguide 100 is simulated cut open along its axial direction and unfolded into a two-dimensional rectangular diagram, and the axial direction and circumferential wind direction of the two-dimensional rectangular diagram are equally divided into m rows and n columns of grids. In this embodiment, the inner wall of the waveguide 100 is equally divided into 100 grids along its length and circumference direction, which are 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 length of the pipeline and C is the circumference of the pipeline after unfolding.

[0053] S102: Obtain an image of the two-dimensional rectangular image of the waveguide 100 after expansion, and convert the image of the two-dimensional rectangular image into a binary image; analyze each grid, calculate the proportion of the pixel points of the blockage in each grid to the total pixel points, and obtain the blockage proportion p of each grid. ij , where i and j are the row and column numbers of the grid, respectively.

[0054] S201: Calculate the average value of all grid proportions It is expressed as:

[0055]

[0056] Calculate the variance σ of the blockage ratio 2 , expressed as:

[0057]

[0058] The loose aggregation degree is defined as S, where S is the standard deviation σ of the blockage ratio, expressed as:

[0059]

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

[0061] S202: Record the existence of blockages in each grid to form an occupancy matrix B. ij =1, indicating that this grid is occupied by a blockage. ij = 0, it means that this grid is not occupied by the obstruction; scan one by one along the length direction of the two-dimensional rectangular graph, and record the continuous sections occupied by the obstruction in each row of grids; for each row, confirm the distance between the first occupied grid and the last occupied grid, which is l i ; The blockage length ΔL is the total length of the largest continuous occupied segments in all rows, expressed as:

[0062]

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

[0064] For example, the sample data is:

[0065] The grid occupancy of the third row is: [0, 0, 1, 1, 1, 1, 0, 0, 0, 0]

[0066] The grid occupancy of the fourth row is: [0, 1, 1, 1, 1, 1, 0, 0, 0]

[0067] The grid occupancy of the fifth row is: [0, 0, 1, 1, 1, 1, 0, 0, 0]

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

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

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

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

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

[0073] V=aS 2 +bS+cL 2 +dL+e

[0074] The blockage in the waveguide 100 is simulated and arranged, and then the experimental data are collected using the above-mentioned methods S201 and S202 as follows:

[0075]

[0076]

[0077] The least squares method was used to obtain the fitting parameters a=-0.02, b=0.80, c=-0.15, d=0.85, e=0.10. The relationship between the solenoid valve opening degree V and the loose aggregation degree S and the blockage length L is expressed as follows:

[0078] V=-0.02S 2 +0.80S-0.15L 2 +0.85L+0.10

[0079] Among them, S is the degree of loose aggregation, L is the total length of the largest continuous occupied segments in all rows, and a, b, c, d, and e are fitting parameters.

[0080] S401: The function of the opening degree V of the solenoid valve and the current I applied to it is:

[0081] V=kI+c

[0082] The data of multiple sets of current I and corresponding solenoid valve opening degree V are measured experimentally as follows:

[0083] Data Points CurrentI(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

[0084] The fitting parameters k=1.8 and c=-0.08 are obtained by using the least square method. The relationship between the opening degree V of the solenoid valve and the current I applied to it is expressed as:

[0085] V=1.8I-0.08

[0086] k is the proportional constant and c is the offset.

[0087] Example 3

[0088] See also Figure 1 to Figure 3 , this embodiment is based on the above embodiment, and this embodiment provides a waveguide purge system.

[0089] Specifically, the waveguide purging system includes an image processing module 200, an acquisition module 300 and a control module 400; wherein the image processing module 200 is used to preprocess the image in the waveguide 100; the acquisition module 300 is used to collect the loose aggregation degree data and length data of the blockage in the waveguide 100 through the preprocessed image; the control module 400 establishes a fitting function of the solenoid valve opening degree V through the loose aggregation degree and length data, and obtains the predicted value of the solenoid valve opening degree V through the fitting function, and obtains the current value that needs to be applied to the solenoid valve through the predicted value of the solenoid valve opening degree V.

[0090] Example 4

[0091] This embodiment provides an electronic device, which is applicable to a waveguide purging system, and includes 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, which, when executed by the processor, implement the steps of the waveguide purging method proposed in the above embodiment.

[0092] Example 5

[0093] This embodiment provides a computer-readable storage medium, which stores computer-executable instructions, which, when executed by a processor, implement the steps of the waveguide purging method.

[0094] The storage medium proposed in this embodiment and the waveguide purging method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0095] Based on the above, the beneficial effects of the present invention are:

[0096] 1. The gas flow rate in the waveguide 100 is directly adjusted by controlling the opening degree of the solenoid valve, without the need for a regulating valve, and the purge gas does not need to be generated all the time, which is more energy-saving and environmentally friendly;

[0097] 2. According to the actual situation of the blockage in the waveguide 100, that is, the loose aggregation degree and length of the blockage, the purge gas entering the waveguide 100 is adaptively adjusted, so that the blockage can be removed more accurately.

[0098] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A waveguide purging method, characterized in that: include: Preprocessing the image in the waveguide (100); Collecting data on the degree of loosening and length of the obstruction in the waveguide (100); Establishing a fitting function of the opening degree of the solenoid valve according to the aggregation degree data and the length data; The opening degree of the solenoid valve is calculated by the fitting function.

2. The waveguide purging method according to claim 1, characterized in that: The waveguide (100) is simulated cut open along its axial direction and unfolded into a two-dimensional rectangular diagram, and the two-dimensional rectangular diagram is equally divided into m rows and n columns of grids along the axial direction and circumferential wind direction; each grid has a length of L / m and a width of C / n, wherein L is the length of the pipeline and C is the circumference of the pipeline after unfolding.

3. The waveguide purging method according to claim 2, characterized in that: Obtain an image of a two-dimensional rectangular image of the waveguide (100) after expansion, and convert the image of the two-dimensional rectangular image into a binary image; analyze each grid, calculate the proportion of pixel points of the blockage in each grid to the total pixel points, and obtain the blockage proportion p of each grid. ij , where i and j are the row and column numbers of the grid, respectively.

4. The waveguide purging method according to claim 3, characterized in that: Calculate the average of all grid proportions It is expressed as: Calculate the variance σ of the blockage ratio 2 , expressed as: The loose aggregation degree is defined as S, where S is the standard deviation σ of the blockage ratio, expressed as: The loose aggregation degree of the blockage is positively correlated with the standard deviation.

5. The waveguide purging method according to claim 2, characterized in that: Record the existence of blockages in each grid to form an occupancy matrix B. ij =1, indicating that this grid is occupied by a blockage. ij =0, it means that this grid is not occupied by the blockage; scan one by one along the length direction of the two-dimensional rectangular diagram, and record the continuous sections occupied by the blockage in each row of grids; For each row, determine the distance between the first occupied grid and the last occupied grid, which is l i The blockage length ΔL is the total length of the largest continuous occupied segments in all rows, expressed as: Where a and b are the starting and ending column numbers of the continuous segment of the blockage in each row.

6. The waveguide purging method according to claim 5, characterized in that: The fitting function of the solenoid valve opening degree V is expressed as: V=aS 2 +bS+cL 2 +dL+e The least squares method was used to obtain the fitting parameters a=-0.02, b=0.80, c=-0.15, d=0.85, e=0.

10. The relationship between the solenoid valve opening degree V and the loose aggregation degree S and the blockage length L is expressed as follows: V=-0.02S 2 +0.80S-0.15L 2 +0.85L+0.10 Among them, S is the degree of loose aggregation, L is the total length of the largest continuous occupied segments in all rows, and a, b, c, d, and e are fitting parameters.

7. The waveguide purging method according to claim 1 or 2, characterized in that: The function of the opening degree V of the solenoid valve and the current I applied to it is: V=kI+c The fitting parameters k=1.8 and c=-0.08 are obtained by using the least square method. The relationship between the opening degree V of the solenoid valve and the current I applied to it is expressed as: V=1.8I-0.08 k is the proportional constant and c is the offset.

8. A waveguide purge system, characterized in that: include: An image processing module (200) for preprocessing the image in the waveguide (100); A collection module (300) is used to collect loose aggregation degree data and length data of the obstruction in the waveguide (100) through pre-processed images; The control module (400) establishes a fitting function of the solenoid valve opening degree V through the loose aggregation degree and length data, obtains a predicted value of the solenoid valve opening degree V through the fitting function, and obtains a current value that needs to be applied to the solenoid valve through the predicted value of the solenoid valve opening degree V.

9. An electronic device, characterized in that: include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the waveguide purging method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: It stores computer executable instructions, which, when executed by a processor, implement the steps of the waveguide purging method described in any one of claims 1 to 7.

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