Flow control method and device for steam soot blowing

Abstract

The invention discloses a flow control method and device for steam soot blowing, and the method comprises the steps: obtaining a soot deposition image in a boiler, and carrying out the gray processing to obtain a soot deposition degree image; carrying out clustering analysis on pixel points in the accumulated ash level image, and determining an accumulated ash distribution area of the accumulated ash level image according to an analysis result; calculating the ash deposition degree of each ash deposition distribution area to obtain the ash deposition severity; the overall soot deposition degree of the boiler is determined based on all the soot deposition severity degrees, and a steam soot blowing flow control strategy is set according to the overall soot deposition degree; and steam soot blowing is conducted on accumulated soot in the boiler according to the flow control strategy. Clustering analysis is carried out on the ash deposition degree image, fine analysis of ash deposition distribution can be achieved, the ash deposition conditions of different areas can be recognized, the overall ash deposition degree in the boiler is determined accordingly, the flow control strategy of steam soot blowing is set based on the overall ash deposition degree, steam soot blowing is carried out on the accumulated ash in the boiler flexibly, and the boiler soot blowing efficiency is improved. The ash removal efficiency is improved; and energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler maintenance, and in particular to a flow control method and device for steam soot blowing. Background Art

[0002] Steam soot blowing is a common boiler cleaning technology used to remove ash deposits inside the boiler, keep the heat exchange surface clean, and ensure the efficient and safe operation of the boiler system. During the steam soot blowing process, by spraying high-pressure steam into the boiler, the ash deposits can be removed from the heat exchange surface and the inside of the pipe, thereby preventing the ash deposits from affecting the heat transfer efficiency and improving the thermal efficiency and safety of the boiler. The flow control method of steam soot blowing refers to adjusting the flow of the steam soot blowing system according to the ash accumulation in the boiler to achieve targeted removal of ash deposits in different areas, so as to improve the cleaning efficiency, reduce energy consumption, and extend the life of the equipment.

[0003] However, the flow control method of traditional steam soot blowing is usually based on experience and simple rules, and lacks sophisticated monitoring and evaluation of the ash accumulation inside the boiler, which makes it difficult to determine and control the flow of steam soot blowing, resulting in low cleaning efficiency, waste of energy, and even inability to effectively remove ash accumulation. In addition, traditional methods are often unable to adapt to the dynamic changes in the ash accumulation situation in the boiler. Since the ash accumulation in the boiler will change with factors such as the operating status and fuel characteristics, the degree of ash accumulation will vary. Traditional methods can often only remove the ash based on one flow control method and cannot be flexibly adjusted. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a flow control method and device for steam soot blowing, comprising:

[0005] Acquire the dust accumulation image in the boiler, and perform grayscale processing on the dust accumulation image to obtain a dust accumulation grayscale image;

[0006] Performing cluster analysis on the pixel points in the dust accumulation grayscale image, and determining the dust accumulation distribution area of ​​the dust accumulation grayscale image according to the analysis result;

[0007] Calculate the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area;

[0008] Determine the overall ash accumulation level of the boiler based on the severity of ash accumulation in each ash accumulation distribution area, and set the flow control strategy of steam soot blowing according to the overall ash accumulation level;

[0009] Steam soot blowing is performed on the accumulated ash in the boiler according to the flow control strategy.

[0010] Furthermore, performing cluster analysis on the pixel points in the dust accumulation grayscale image and determining the dust accumulation distribution area of ​​the dust accumulation grayscale image according to the analysis result includes:

[0011] Obtaining the area of ​​the dust accumulation grayscale image, and determining the number of cluster centers based on the area of ​​the dust accumulation grayscale image;

[0012] Obtain the pixel value of each pixel of the grayscale image, and cluster the pixel value of each pixel based on the k-means clustering algorithm;

[0013] Determine several clusters according to the clustering results, and obtain the grayscale value of the cluster center corresponding to each cluster;

[0014] The clusters whose grayscale values ​​of the cluster centers exceed a preset threshold are selected, and the dust accumulation grayscale image is partitioned according to the selected clusters to obtain the dust accumulation distribution area of ​​the dust accumulation grayscale image.

[0015] Furthermore, the calculation of the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area includes:

[0016] Obtaining the grayscale value of each pixel in each dust accumulation distribution area, and dividing the pixel points in each dust accumulation distribution area into a plurality of grayscale levels based on the grayscale value;

[0017] Count the number of pixels corresponding to each gray level in each dust accumulation distribution area, and use the ratio of the number of pixels corresponding to each gray level to the total number of pixels in the corresponding dust accumulation distribution area as the weight of each gray level;

[0018] Calculate the average gray value of the pixel points corresponding to each gray level in each dust accumulation distribution area, and use the average gray value as the dust accumulation value of each gray level;

[0019] The dust accumulation value of each gray level in each dust accumulation distribution area and the weight corresponding to each gray level are weightedly added to calculate the dust accumulation severity of each dust accumulation distribution area.

[0020] Furthermore, the pixel points in each dust accumulation distribution area are divided into a plurality of gray levels based on the gray value, including:

[0021] Obtain the pixel with the maximum grayscale value and the pixel with the minimum grayscale value in each dust accumulation distribution area, and calculate the grayscale value difference between the pixel with the maximum grayscale value and the pixel with the minimum grayscale value;

[0022] Presetting a grayscale value difference interval-grayscale level number mapping table, determining the grayscale value difference interval in which the grayscale value difference is located based on the grayscale value difference interval-grayscale level number mapping table, and selecting the corresponding grayscale level number;

[0023] The grayscale values ​​of the pixels in each dust accumulation distribution area are divided according to the number of grayscale levels to obtain the grayscale level of each dust accumulation distribution area.

[0024] Furthermore, the determining of the overall ash accumulation degree of the boiler based on the ash accumulation severity of each ash accumulation distribution area includes:

[0025] Determine the grayscale coefficient of each dust accumulation distribution area by using the grayscale value of the cluster center corresponding to each dust accumulation distribution area;

[0026] Evaluate and determine the severity of dust accumulation in each dust accumulation distribution area to obtain a dust accumulation severity evaluation value for each dust accumulation distribution area;

[0027] The ash accumulation severity assessment value of each ash accumulation distribution area is multiplied by the grayscale coefficient corresponding to each ash accumulation distribution area, and the multiplied results are added to obtain the overall ash accumulation degree of the boiler.

[0028] Furthermore, the step of evaluating and obtaining the dust accumulation severity of each dust accumulation distribution area to obtain the dust accumulation severity evaluation value of each dust accumulation distribution area includes:

[0029] A number of experts use the expert assignment method to assign values ​​and scores to the severity of dust accumulation in each dust accumulation distribution area, and obtain the scores of the experts;

[0030] The average values ​​of all scoring values ​​belonging to the same dust distribution area are calculated respectively, and the average value of the scoring values ​​corresponding to each dust distribution area is used as the dust severity assessment value of each dust distribution area.

[0031] Furthermore, the flow control strategy of steam soot blowing is set according to the overall soot accumulation degree, including:

[0032] The standard dust accumulation level G0 is set in advance, and the first preset dust accumulation level difference g1, the second preset dust accumulation level difference g2, the third preset dust accumulation level difference g3 and the fourth preset dust accumulation level difference g4 are set, and g1<g2<g3<g4; the processing module is also used to set the first preset flow control strategy A1 (a1, b1), the second preset flow control strategy A2 (a2, b2), the third preset flow control strategy A3 (a3, b3) and the fourth preset flow control strategy A4 (a4, b4), wherein a1-a4 are the first to fourth preset nozzle numbers respectively, and a1<a2<a3<a4, b1-b4 are the first to fourth preset steam pressures respectively, and b1<b2<b3<b4;

[0033] Obtaining the overall ash accumulation degree △G of the boiler, and selecting a preset flow control strategy Ai as the flow control strategy for steam soot blowing according to the difference between the obtained overall ash accumulation degree △G of the boiler and the set standard ash accumulation degree G0;

[0034] When △G-G0≤g1, the first preset flow control strategy A1 is selected as the flow control strategy for steam soot blowing;

[0035] When g1<△G-G0≤g2, the second preset flow control strategy A2 is selected as the flow control strategy for steam soot blowing;

[0036] When g2<△G-G0≤g3, the third preset flow control strategy A3 is selected as the flow control strategy for steam soot blowing;

[0037] When g3<ΔG-G0≤g4, the fourth preset flow control strategy A4 is selected as the flow control strategy for steam soot blowing.

[0038] The present invention also provides a flow control device for steam soot blowing, comprising:

[0039] An acquisition module is used to acquire an ash accumulation image in the boiler and perform grayscale processing on the ash accumulation image to obtain an ash accumulation grayscale image;

[0040] An analysis module is used to perform cluster analysis on the pixel points in the dust accumulation grayscale image, and determine the dust accumulation distribution area of ​​the dust accumulation grayscale image according to the analysis result;

[0041] A calculation module is used to calculate the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area;

[0042] A strategy module is used to determine the overall ash accumulation degree of the boiler based on the severity of ash accumulation in each ash accumulation distribution area, and to set a flow control strategy for steam soot blowing according to the overall ash accumulation degree;

[0043] The control module is used to perform steam soot blowing on the ash deposits in the boiler according to the flow control strategy.

[0044] Compared with the prior art, the flow control method and device for steam soot blowing according to the embodiment of the present invention have the following beneficial effects:

[0045] The present invention can realize the refined analysis of ash accumulation distribution by clustering analysis on ash accumulation grayscale images, identify the ash accumulation conditions in different areas, and determine the overall ash accumulation level in the boiler accordingly. Based on this, the flow control strategy of steam soot blowing is set to flexibly perform steam soot blowing on the ash accumulation in the boiler, thereby improving the cleaning efficiency and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 1 is a schematic diagram of the flow structure of a method for controlling the flow of steam soot blowing according to an embodiment of the present invention;

[0047] Figure 2It is a schematic diagram of the composition of a flow control device for steam soot blowing in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0049] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the platform or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] The terms "second" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined with "second" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] like Figure 1 As shown, in an embodiment of the present application, a flow control method for steam soot blowing is provided, including: S100: acquiring an ash accumulation image in a boiler, and performing grayscale processing on the ash accumulation image to obtain an ash accumulation grayscale image; S200: performing cluster analysis on pixel points in the ash accumulation grayscale image, and determining the ash distribution area of ​​the ash accumulation grayscale image according to the analysis result; S300: calculating the ash accumulation degree of each ash accumulation distribution area to obtain the ash accumulation severity of each ash accumulation distribution area; S400: determining the overall ash accumulation degree of the boiler based on the ash accumulation severity of each ash accumulation distribution area, and setting a flow control strategy for steam soot blowing according to the overall ash accumulation degree; S500: performing steam soot blowing on the ash in the boiler according to the flow control strategy.

[0053] Furthermore, the present invention can achieve a refined analysis of the ash accumulation distribution by performing cluster analysis on the ash accumulation grayscale image, identify the ash accumulation conditions in different areas, and determine the overall ash accumulation level in the boiler based on this. The flow control strategy for steam soot blowing is set based on this, so as to flexibly perform steam soot blowing on the ash in the boiler, thereby improving the cleaning efficiency and saving energy.

[0054] In an embodiment of the present application, a flow control method for steam soot blowing is provided, wherein cluster analysis is performed on pixel points in a dust accumulation grayscale image, and the dust distribution area of ​​the dust accumulation grayscale image is determined based on the analysis results, including: obtaining the area of ​​the dust accumulation grayscale image, and determining the number of clustering centers based on the area of ​​the dust accumulation grayscale image; obtaining the pixel value of each pixel point of the dust accumulation grayscale image, and clustering the pixel value of each pixel point based on a k-means clustering algorithm; determining a number of clusters based on the clustering results, and obtaining the grayscale value of the cluster center corresponding to each cluster; selecting a cluster whose grayscale value of the cluster center exceeds a preset threshold, and partitioning the dust accumulation grayscale image according to the selected clusters to obtain the dust distribution area of ​​the dust accumulation grayscale image.

[0055] Specifically, for a given grayscale image with dust accumulation, its area is calculated using image processing technology, and the number of cluster centers is determined based on the elbow rule for the area of ​​the grayscale image with dust accumulation; the pixel value of each pixel in the grayscale image with dust accumulation is extracted, and the K-means clustering algorithm is applied to cluster the pixels, and the K-means algorithm is used to divide the pixels into different clusters according to the similarity of the pixel values; according to the results of K-means clustering, several clusters are determined, and the grayscale values ​​of the cluster centers corresponding to each cluster are obtained, and these cluster centers represent the average grayscale values ​​of different clusters; according to a preset grayscale threshold, clusters that exceed the threshold are selected, and the areas corresponding to these clusters may represent parts with more serious dust accumulation; according to the selected clusters, the grayscale image with dust accumulation is partitioned to obtain an image representation of the dust accumulation distribution area, so that the distribution and severity of the dust accumulation can be clearly understood.

[0056] In an embodiment of the present application, a flow control method for steam soot blowing is provided, wherein the degree of dust accumulation in each dust distribution area is calculated to obtain the dust severity of each dust distribution area, including: obtaining the grayscale value of each pixel in each dust distribution area, and dividing the pixel points in each dust distribution area into a plurality of grayscale levels based on the grayscale value; counting the number of pixel points corresponding to each grayscale level in each dust distribution area, and taking the ratio of the number of pixel points corresponding to each grayscale level to the number of pixel points in the corresponding dust distribution area as the weight of each grayscale level; calculating the average grayscale value of the pixel points corresponding to each grayscale level in each dust distribution area, and taking the average grayscale value as the dust value of each grayscale level; performing weighted addition calculation on the dust value of each grayscale level in each dust distribution area and the weight corresponding to each grayscale level to obtain the dust severity of each dust distribution area.

[0057] Specifically, for each dust accumulation distribution area, it is necessary to obtain the grayscale value of each pixel therein, traverse the image, and record the grayscale value of each pixel; based on the grayscale value of the pixel, divide the pixels in each dust accumulation distribution area into different grayscale levels; for each grayscale level, count the number of pixels corresponding to it in the dust accumulation distribution area, and use the ratio of the number of pixels corresponding to each grayscale level to the total number of pixels in the corresponding dust accumulation distribution area as the weight of each grayscale level; for each grayscale level, calculate the average grayscale value of its corresponding pixel, and perform weighted addition calculation on the dust accumulation value of each grayscale level (i.e., the average grayscale value) and its corresponding weight to obtain the severity of dust accumulation in each dust accumulation distribution area and determine the importance of different grayscale levels in the dust accumulation distribution area.

[0058] In an embodiment of the present application, a flow control method for steam soot blowing is provided, wherein the pixel points in each dust accumulation distribution area are divided into a number of grayscale levels based on the grayscale value, including: obtaining the pixel point with the maximum grayscale value and the pixel point with the minimum grayscale value in each dust accumulation distribution area, and calculating the grayscale value difference between the pixel point with the maximum grayscale value and the pixel point with the minimum grayscale value; pre-setting a grayscale value difference interval-grayscale level number mapping table, judging the grayscale value difference interval in which the grayscale value difference is located based on the grayscale value difference interval-grayscale level number mapping table, and selecting the corresponding number of grayscale levels; dividing the grayscale values ​​of the pixel points in each dust accumulation distribution area according to the number of grayscale levels, and obtaining the grayscale level of each dust accumulation distribution area.

[0059] Specifically, for each dust distribution area, find the pixel with the largest grayscale value and the pixel with the smallest grayscale value, and for each dust distribution area, calculate the grayscale value difference between the pixel with the largest grayscale value and the pixel with the smallest grayscale value; pre-set a mapping table from the grayscale value difference interval to the number of grayscale levels, for determining the corresponding number of grayscale levels according to the grayscale value difference, and according to the preset mapping table, determine the interval in which the grayscale value difference is located, and select the corresponding number of grayscale levels; according to the determined number of grayscale levels, divide the grayscale values ​​of the pixels in each dust distribution area to obtain the grayscale levels of each dust distribution area.

[0060] In an embodiment of the present application, a flow control method for steam soot blowing is provided, which determines the overall ash degree of the boiler based on the ash severity of each ash distribution area, including: determining the grayscale coefficient of each ash distribution area by the grayscale value of the cluster center corresponding to each ash distribution area; evaluating and taking the ash severity of each ash distribution area to obtain an ash severity evaluation value of each ash distribution area; multiplying the ash severity evaluation value of each ash distribution area with the grayscale coefficient corresponding to each ash distribution area, and then adding the multiplied results to obtain the overall ash degree of the boiler.

[0061] Specifically, for each ash distribution area, determine the grayscale value of its corresponding cluster center, which can be used as the grayscale coefficient of the area; evaluate and value the ash severity of each ash distribution area to obtain the ash severity evaluation value of each ash distribution area; multiply the ash severity evaluation value of each ash distribution area by its corresponding grayscale coefficient, and then add the multiplication results of each ash distribution area to obtain the overall ash degree of the boiler.

[0062] In an embodiment of the present application, a flow control method for steam soot blowing is provided, wherein the ash severity of each ash distribution area is evaluated and valued to obtain an ash severity evaluation value for each ash distribution area, including: multiple experts assign scores to the ash severity of each ash distribution area by an expert assignment method to obtain scores of multiple experts; the average values ​​of all scores belonging to the same ash distribution area are calculated respectively, and the average value of the scores corresponding to each ash distribution area is used as the ash severity evaluation value of each ash distribution area.

[0063] Specifically, multiple experts assign values ​​and scores to the severity of dust accumulation in each dust distribution area, and obtain scores from multiple experts. These scores can reflect the different views and evaluations of different experts on each area. For each dust distribution area, the average of all experts' scores is calculated; the average of the scores corresponding to each dust distribution area is used as the dust severity assessment value of the area, and this average can be regarded as a comprehensive evaluation of the area.

[0064] In an embodiment of the present application, a flow control method for steam soot blowing is provided, wherein the flow control strategy for steam soot blowing is set according to the overall dust accumulation degree, including: setting a standard dust accumulation degree G0 in advance, and setting a first preset dust accumulation degree difference g1, a second preset dust accumulation degree difference g2, a third preset dust accumulation degree difference g3 and a fourth preset dust accumulation degree difference g4, and g1<g2<g3<g4; the processing module is also used to set a first preset flow control strategy A1 (a1, b1), a second preset flow control strategy A2 (a2, b2), a third preset flow control strategy A3 (a3, b3) and a fourth preset flow control strategy A4 (a4, b4), wherein a1-a4 are the first to fourth preset nozzle numbers, and a1<a2<a3<a4, b1-b4 are respectively The first to fourth preset steam pressures, b1<b2<b3<b4; the overall ash accumulation degree △G of the boiler is obtained, and according to the difference between the obtained overall ash accumulation degree △G of the boiler and the set standard ash accumulation degree G0, the preset flow control strategy Ai is selected as the flow control strategy for steam soot blowing; when △G-G0≤g1, the first preset flow control strategy A1 is selected as the flow control strategy for steam soot blowing; when g1<△G-G0≤g2, the second preset flow control strategy A2 is selected as the flow control strategy for steam soot blowing; when g2<△G-G0≤g3, the third preset flow control strategy A3 is selected as the flow control strategy for steam soot blowing; when g3<△G-G0≤g4, the fourth preset flow control strategy A4 is selected as the flow control strategy for steam soot blowing.

[0065] Specifically, a standard ash accumulation level G0 and a plurality of different preset ash accumulation level differences g1, g2, g3 and g4 are set. These values ​​are used to determine the different level ranges of boiler ash accumulation levels; a plurality of preset flow control strategies A1 to A4 are set, each strategy including the setting of the number of nozzles and steam pressure. These strategies are used to control the flow rate of steam soot blowing; obtain the overall ash accumulation degree △G of the boiler, compare the overall ash accumulation degree △G of the boiler with the set standard ash accumulation degree G0, and select the preset flow control strategy Ai as the flow control strategy for steam soot blowing according to the difference between △G-G0; when △G-G0≤g1, select A1 as the flow control strategy for steam soot blowing; when g1<△G-G0≤g2, select A2 as the flow control strategy for steam soot blowing; when g2<△G-G0≤g3, select A3 as the flow control strategy for steam soot blowing; when g3<△G-G0≤g4, select A4 as the flow control strategy for steam soot blowing. By monitoring the ash accumulation degree of the boiler and automatically selecting the steam soot blowing flow control strategy, the burden of manual intervention can be reduced, and the efficiency and stability of the system can be improved. In addition, by setting multiple ash accumulation degree differences and corresponding flow control strategies, fine regulation and control can be made for different degrees of ash accumulation to ensure the balance between the effect of steam soot blowing and energy consumption.

[0066] like Figure 2 As shown, in an embodiment of the present application, a flow control device for steam soot blowing is provided, including: an acquisition module, used to acquire an ash accumulation image in a boiler, and grayscale process the ash accumulation image to obtain an ash accumulation grayscale image; an analysis module, used to cluster the pixel points in the ash accumulation grayscale image, and determine the ash distribution area of ​​the ash accumulation grayscale image according to the analysis result; a calculation module, used to calculate the ash accumulation degree of each ash accumulation distribution area, and obtain the ash accumulation severity of each ash accumulation distribution area; a strategy module, used to determine the overall ash accumulation degree of the boiler based on the ash accumulation severity of each ash accumulation distribution area, and set the flow control strategy of steam soot blowing according to the overall ash accumulation degree; a control module, used to steam soot blow the ash in the boiler according to the flow control strategy.

[0067] In summary, the embodiment of the present invention provides a flow control method and device for steam soot blowing, which includes: obtaining an ash accumulation image in a boiler, and performing grayscale processing to obtain an ash accumulation grayscale image; performing cluster analysis on the pixel points in the ash accumulation grayscale image, and determining the ash accumulation distribution area of ​​the ash accumulation grayscale image according to the analysis result; calculating the ash accumulation degree of each ash accumulation distribution area to obtain the severity of ash accumulation; determining the overall ash accumulation degree of the boiler based on each ash accumulation severity, and setting a flow control strategy for steam soot blowing according to the overall ash accumulation degree; and performing steam soot blowing on the ash in the boiler according to the flow control strategy. The present invention can achieve a refined analysis of the ash accumulation distribution by performing cluster analysis on the ash accumulation grayscale image, identify the ash accumulation conditions in different areas, and determine the overall ash accumulation degree in the boiler accordingly, and set a flow control strategy for steam soot blowing based on this, so as to flexibly perform steam soot blowing on the ash in the boiler, thereby improving the cleaning efficiency and saving energy.

[0068] Finally, it should be noted that it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0069] The above is only an example of implementation of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made according to the present invention, as long as they do not lose the essence of the present invention, should be regarded as falling within the scope of protection of the present invention and being restricted. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the platform described above can refer to the corresponding process in the aforementioned platform embodiment, and will not be repeated here.

[0070] The term "comprises" or any other similar term is intended to cover a non-exclusive inclusion such that a process, platform, article, or apparatus / platform that includes a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, platform, article, or apparatus / platform.

[0071] So far, the technical solutions of the present invention have been described in conjunction with the further embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A flow control method for steam soot blowing, characterized in that: include: Acquire the dust accumulation image in the boiler, and perform grayscale processing on the dust accumulation image to obtain a dust accumulation grayscale image; Performing cluster analysis on the pixel points in the dust accumulation grayscale image, and determining the dust accumulation distribution area of ​​the dust accumulation grayscale image according to the analysis result; Calculate the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area; Determine the overall ash accumulation level of the boiler based on the severity of ash accumulation in each ash accumulation distribution area, and set the flow control strategy of steam soot blowing according to the overall ash accumulation level; Steam soot blowing is performed on the accumulated ash in the boiler according to the flow control strategy.

2. A steam soot blowing flow control method according to claim 1, characterized in that: The clustering analysis is performed on the pixel points in the dust accumulation grayscale image, and the dust accumulation distribution area of ​​the dust accumulation grayscale image is determined according to the analysis result, including: Obtaining the area of ​​the dust accumulation grayscale image, and determining the number of cluster centers based on the area of ​​the dust accumulation grayscale image; Obtain the pixel value of each pixel of the grayscale image, and cluster the pixel value of each pixel based on the k-means clustering algorithm; Determine several clusters according to the clustering results, and obtain the grayscale value of the cluster center corresponding to each cluster; The clusters whose grayscale values ​​of the cluster centers exceed a preset threshold are selected, and the dust accumulation grayscale image is partitioned according to the selected clusters to obtain the dust accumulation distribution area of ​​the dust accumulation grayscale image.

3. A steam soot blowing flow control method according to claim 2, characterized in that: The calculation of the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area includes: Obtaining the grayscale value of each pixel in each dust accumulation distribution area, and dividing the pixel points in each dust accumulation distribution area into a plurality of grayscale levels based on the grayscale value; Count the number of pixels corresponding to each gray level in each dust accumulation distribution area, and use the ratio of the number of pixels corresponding to each gray level to the total number of pixels in the corresponding dust accumulation distribution area as the weight of each gray level; Calculate the average gray value of the pixel points corresponding to each gray level in each dust accumulation distribution area, and use the average gray value as the dust accumulation value of each gray level; The dust accumulation value of each gray level in each dust accumulation distribution area and the weight corresponding to each gray level are weightedly added to calculate the dust accumulation severity of each dust accumulation distribution area.

4. A steam soot blowing flow control method according to claim 3, characterized in that: The pixel points in each dust accumulation distribution area are divided into a plurality of gray levels based on the gray value, including: Obtain the pixel with the maximum grayscale value and the pixel with the minimum grayscale value in each dust accumulation distribution area, and calculate the grayscale value difference between the pixel with the maximum grayscale value and the pixel with the minimum grayscale value; Presetting a grayscale value difference interval-grayscale level number mapping table, determining the grayscale value difference interval in which the grayscale value difference is located based on the grayscale value difference interval-grayscale level number mapping table, and selecting the corresponding grayscale level number; The grayscale values ​​of the pixels in each dust accumulation distribution area are divided according to the number of grayscale levels to obtain the grayscale level of each dust accumulation distribution area.

5. A steam soot blowing flow control method according to claim 4, characterized in that: Determining the overall ash accumulation degree of the boiler based on the ash accumulation severity of each ash accumulation distribution area includes: Determine the grayscale coefficient of each dust accumulation distribution area by using the grayscale value of the cluster center corresponding to each dust accumulation distribution area; Evaluate and determine the severity of dust accumulation in each dust accumulation distribution area to obtain a dust accumulation severity evaluation value for each dust accumulation distribution area; The ash accumulation severity assessment value of each ash accumulation distribution area is multiplied by the grayscale coefficient corresponding to each ash accumulation distribution area, and the multiplied results are added to obtain the overall ash accumulation degree of the boiler.

6. A steam soot blowing flow control method according to claim 5, characterized in that: The step of evaluating and obtaining the dust accumulation severity of each dust accumulation distribution area to obtain the dust accumulation severity evaluation value of each dust accumulation distribution area includes: A number of experts use the expert assignment method to assign values ​​and scores to the severity of dust accumulation in each dust accumulation distribution area, and obtain the scores of the experts; The average values ​​of all scoring values ​​belonging to the same dust distribution area are calculated respectively, and the average value of the scoring values ​​corresponding to each dust distribution area is used as the dust severity assessment value of each dust distribution area.

7. A steam soot blowing flow control method according to claim 5, characterized in that: The flow control strategy of steam soot blowing is set according to the overall soot accumulation degree, including: The standard dust accumulation level G0 is set in advance, and the first preset dust accumulation level difference g1, the second preset dust accumulation level difference g2, the third preset dust accumulation level difference g3 and the fourth preset dust accumulation level difference g4 are set, and g1<g2<g3<g4; the processing module is also used to set the first preset flow control strategy A1 (a1, b1), the second preset flow control strategy A2 (a2, b2), the third preset flow control strategy A3 (a3, b3) and the fourth preset flow control strategy A4 (a4, b4), wherein a1-a4 are the first to fourth preset nozzle numbers respectively, and a1<a2<a3<a4, b1-b4 are the first to fourth preset steam pressures respectively, and b1<b2<b3<b4; Obtaining the overall ash accumulation degree △G of the boiler, and selecting a preset flow control strategy Ai as the flow control strategy for steam soot blowing according to the difference between the obtained overall ash accumulation degree △G of the boiler and the set standard ash accumulation degree G0; When △G-G0≤g1, the first preset flow control strategy A1 is selected as the flow control strategy for steam soot blowing; When g1<△G-G0≤g2, the second preset flow control strategy A2 is selected as the flow control strategy for steam soot blowing; When g2<△G-G0≤g3, the third preset flow control strategy A3 is selected as the flow control strategy for steam soot blowing; When g3<ΔG-G0≤g4, the fourth preset flow control strategy A4 is selected as the flow control strategy for steam soot blowing.

8. A flow control device for steam soot blowing, characterized in that: include: An acquisition module is used to acquire an ash accumulation image in the boiler and perform grayscale processing on the ash accumulation image to obtain an ash accumulation grayscale image; An analysis module is used to perform cluster analysis on the pixel points in the dust accumulation grayscale image, and determine the dust accumulation distribution area of ​​the dust accumulation grayscale image according to the analysis result; A calculation module is used to calculate the dust accumulation degree of each dust accumulation distribution area to obtain the dust accumulation severity of each dust accumulation distribution area; A strategy module is used to determine the overall ash accumulation degree of the boiler based on the severity of ash accumulation in each ash accumulation distribution area, and to set a flow control strategy for steam soot blowing according to the overall ash accumulation degree; The control module is used to perform steam soot blowing on the ash deposits in the boiler according to the flow control strategy.

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