Sintering endpoint control method and system

Abstract

The present application provides a sintering endpoint control method and system, including: determining the actual combustion zone position according to the collected visible light image of the tail section; judging whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold; if the distance between the actual combustion zone position and the preset combustion zone position is greater than the preset threshold, accelerating the vertical sintering speed or extending the sintering time. By shooting the visible light image of the tail section, the actual combustion zone position is determined by processing the real image, and the sintering production process is judged according to the distance between the actual combustion zone position and the preset combustion zone position, and the distance between the two is used as a feedback control factor to control the actual sintering endpoint position to be reasonably stabilized at the preset sintering endpoint position, so as to achieve the maximum output and quality optimization of the sintering process.

Description

Technical Field

[0001] The present application relates to the technical field of steel smelting, and in particular to a sintering endpoint control method and system. Background Art

[0002] The sintering system mainly includes sintering trolley, mixer, main exhaust fan and ring cooler. The process flow chart is shown in Figure 1 As shown: After various raw materials are proportioned in the batching chamber 1, they enter the mixer 2 for mixing and balling to form a mixture, and then they are evenly spread on the sintering trolley 5 through the round roller feeder 3 and the nine-roller distributor 4 to form a sintering mixture layer. The ignition fan 12 and the ignition fan 11 start the ignition furnace to ignite the mixture and start the sintering process. The sintered ore obtained after sintering is crushed by the single roller crusher 8 and then enters the ring cooler 9 for cooling. Finally, it is sent to the blast furnace or the finished ore bin after screening and granulation. Among them, the oxygen required for the sintering process is provided by the main exhaust fan 10. A plurality of vertically arranged wind boxes 6 are arranged under the sintering trolley 5. Under the wind box 6 is a horizontally arranged large flue (or flue) 7. The large flue 7 is connected to the main exhaust fan 10. The negative pressure wind generated by the main exhaust fan 10 through the large flue 7 and the wind box 6 passes through the trolley to provide combustion-supporting wind for the sintering process.

[0003] During the sintering process, the mixed material is roasted from top to bottom, and the roasted material is sintered ore. Figure 2 As shown in FIG. 1 , the ignition furnace ignites the sintering mixture 102 on the uppermost layer of the sintering trolley 5, and the ignited combustion zone 100 begins to move from top to bottom. As the sintering trolley 5 moves from the sintering machine head 20 to the sintering machine tail 21, the combustion zone 100 gradually moves downward, and the mixture 102 passed by the combustion zone 100 is roasted into sintered ore 101. Figure 2 As shown in Fig. 2, the materials in the sintering trolley 5 are sintered ore 101, combustion zone 100, mixed material 102 and bottom material 103 from top to bottom, wherein the bottom material 103 is a finished sintered ore of a certain particle size. When the bottom of the combustion zone 100 just touches the bottom material layer, it is the end of sintering, see Fig. Figure 2 a, the sintering end position is a preset fixed value, generally controlled as the penultimate wind box 6 on the sintering trolley 5. When the sintering trolley 5 moves from the sintering end position to the arc track of the sintering machine tail 21, the movement flips to cause the sintered ore 101 on the sintering trolley 5 to break and form the tail section 22, thereby completing the dumping. Since the combustion zone 100 has a certain thickness, when the sintering trolley 5 moves to the dumping position, such as Figure 2 As shown in c, the combustion zone 100 also has a thin layer, which realizes the most reasonable use of the sintering machine's production capacity.

[0004] In the actual production process, due to the influence of equipment conditions, raw material conditions and process conditions, the sintering production stability is poor, which often makes it difficult to ensure that the sintering end point is at a pre-set fixed position. If the sintering end point is earlier than the pre-set fixed position, it means that over-burning occurs and the production capacity of the sintering machine is not fully utilized, resulting in a decrease in the output of sintered ore; if the sintering end point lags behind the pre-set fixed position, it means that the mixture on the sintering trolley 5 has run to the tail discharge end of the machine before it has time to be completely burned through, resulting in under-burning, which ultimately affects the quality of the sintered ore. Summary of the invention

[0005] The present application provides a sintering endpoint control method and system to control the sintering endpoint to be at a preset fixed position.

[0006] In a first aspect, the present application provides a sintering endpoint control method, comprising:

[0007] Obtain visible light images of the tail section of the sintering trolley in actual sintering production;

[0008] Determining the actual burning zone position according to the visible light image;

[0009] Determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a tail cross-sectional image theoretically synthesized when the sintering end point is at the preset sintering end point position;

[0010] If the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the vertical sintering speed is increased or the sintering time is extended.

[0011] In combination with the first aspect, in an implementable manner of the first aspect, the step of acquiring a visible light image of a tail section of a sintering trolley in actual sintering production includes:

[0012] Continuously collect multiple visible light images of the tail section of the sintering trolley;

[0013] Overlaying multiple visible light imaging images to form a secondary processed imaging image;

[0014] Updating the pixel points in the secondary processed image with brightness higher than a set value to be highlighted;

[0015] Update the pixel points in the secondary processed image whose brightness is lower than or equal to the set value to black;

[0016] The visible light image is obtained.

[0017] In combination with the first aspect, in an implementable manner of the first aspect, the determining whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold value includes:

[0018] A rectangular coordinate system is established with the width of the tail section as the x-axis and the height of the tail section and the direction from the bottom of the trolley to the material surface as the y-axis;

[0019] Take the arithmetic average of the y coordinate values ​​of each point in the highlighted area where the actual burning zone is located to obtain the center line of the actual burning zone;

[0020] Take the arithmetic average of the y coordinate values ​​of each point in the highlighted area where the preset burning zone is located to obtain the center line of the preset burning zone;

[0021] Calculate the difference between the actual burning zone centerline value and the preset burning zone centerline value;

[0022] Determine whether the difference is greater than a preset threshold;

[0023] In combination with the first aspect, in an implementable manner of the first aspect, determining the actual burning zone position according to the visible light image includes:

[0024] The actual burning zone position is determined according to the highlighted area in the visible light image.

[0025] In combination with the first aspect, in an implementation manner of the first aspect, after determining whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the method further includes:

[0026] If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, the control operation is terminated.

[0027] In conjunction with the first aspect, in an implementation manner of the first aspect, the method further includes:

[0028] Detecting whether there is a burning zone in the visible light image;

[0029] If the combustion zone cannot be detected in the visible light image, the vertical sintering speed is slowed down or the sintering time is shortened.

[0030] In conjunction with the first aspect, in an implementation manner of the first aspect, the method further includes:

[0031] If a burning area appears in the visible light image and the burning area is located in an isolated position, filtering the burning area;

[0032] The isolated position is an area that is higher than 1 / 3 of the material layer thickness relative to the bottom of the trolley.

[0033] In a second aspect, the present application further provides a sintering endpoint control system, comprising a central control system and an imaging device installed on a tail platform of a sintering machine, wherein the imaging device is used to obtain a visible light image of a tail section of a sintering trolley in actual sintering production, and the central control system is configured as follows when executing the sintering endpoint control method provided in the first aspect of the present application:

[0034] Obtaining a visible light image of the tail section of the sintering trolley in actual sintering production collected by an imaging device;

[0035] Determining the actual burning zone position according to the visible light image;

[0036] Determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a tail cross-sectional image theoretically synthesized when the sintering end point is at the preset sintering end point position;

[0037] If the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the vertical sintering speed is increased or the sintering time is extended.

[0038] In conjunction with the second aspect, in an implementation manner of the second aspect, the central control system is further configured as follows:

[0039] If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, the control operation is terminated.

[0040] In conjunction with the second aspect, in an implementation manner of the second aspect, the central control system is further configured as follows:

[0041] Detecting whether there is a burning zone in the visible light image;

[0042] If the combustion zone cannot be detected in the visible light image, the vertical sintering speed is slowed down or the sintering time is shortened.

[0043] It can be seen from the above technical scheme that the embodiment of the present application provides a sintering end point control method and system, which determines the actual combustion zone position according to the collected visible light image of the tail section; judges whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a theoretically synthesized tail section image when the sintering end point is at the preset sintering end point position; if the distance between the actual combustion zone position and the preset combustion zone position is greater than the preset threshold, the vertical sintering speed is accelerated or the sintering time is extended.

[0044] The embodiment of the present application takes a visible light image of the tail section of the machine, processes the real image to determine the actual combustion zone position, and judges the sintering production process according to the distance between the actual combustion zone position and the preset combustion zone position. The distance between the two is used as a feedback control factor to control the actual sintering end point position to be reasonably stabilized at the preset sintering end point position, thereby achieving maximization of the sintering process output and optimization of quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A process flow chart of the sintering system provided for the prior art;

[0046] Figure 2 A schematic diagram of sintered ore formation on a sintering machine provided by the prior art;

[0047] Figure 3 A schematic diagram of the structure of tail section imaging provided in an embodiment of the present application;

[0048] Figure 4 A schematic diagram of a tail section under a theoretical production state provided in an embodiment of the present application;

[0049] Figure 5 A schematic diagram of a preset cross-sectional image provided in an embodiment of the present application;

[0050] Figure 6 A schematic diagram of an actual sintering cross-section imaging provided in an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the superposition of the preset combustion zone centerline and the actual combustion zone centerline provided in the embodiment of the present application;

[0052] Figure 8 A schematic diagram of an actual sintering cross section provided in an embodiment of the present application;

[0053] Fig. 9 A schematic diagram of the structure of a sintering endpoint control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0055] See also Figure 2The schematic diagram of sintered ore formation on the sintering machine shown is an application scenario of the embodiment of the present application. In this application scenario, controlling the sintering endpoint is an important means of sintering control. During the sintering process, after the mixture 102 is laid on the sintering trolley, the furnace ignites the sintered mixture 102 on the top layer of the sintering trolley 5, and the ignited combustion zone 100 begins to move from top to bottom. As the sintering trolley 5 moves from the sintering machine head 20 to the sintering machine tail 21, the combustion zone 100 gradually moves downward, and the mixture 102 passed by the combustion zone 100 is roasted into sintered ore 101. The sintering endpoint position is a pre-set fixed value, which is generally controlled to be the second to last bellows 6 on the sintering trolley 5 to achieve the most reasonable use of the sintering machine area.

[0056] In order to reasonably control the sintering endpoint, the embodiment of the present application provides a sintering endpoint control method and system. A sintering endpoint control method provided by the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0057] See also Figure 3 The sintering trolley 5 carries the sintered ore 101, and the trolley moves forward under the drive of the sintering head and tail wheels. At the tail 21 of the sintering machine, the sintering trolley 5 begins to tilt, and the continuous sintering material surface begins to break from the tilted part of the trolley. When the tail wheel drives the trolley to reach the inclination angle A, the whole piece of sintered ore 101 on the tilted trolley slides off the trolley, and the sintered ore section of the adjacent trolley, that is, the tail section, can be fully displayed in front of the camera. The imaging device 23 is installed at the tail platform of the sintering machine to obtain the imaging image of the tail section.

[0058] In addition, a sensor may be installed at the tail 21 of the sintering machine to track the inclination of the sintering trolley 5. When the inclination of the sintering trolley 5 reaches A, the imaging device 23 is controlled to take a picture of the section of the tail of the sintering machine.

[0059] Under the theoretical production state, the sintering end point is at the preset sintering end point position. Since the combustion zone 100 has a certain thickness, when the sintering trolley 5 moves from the preset sintering end point position to the unloading position, the combustion zone 100 still has a thin layer, such as Figure 4 As shown, it is a schematic diagram of the cross section of the tail of the sintering machine under a theoretical production state. At this time, the sintered ore is evenly generated, and there is a narrow straight combustion zone near the bottom material 103 area at the tail of the sintering machine.

[0060] See also Figure 5 In the embodiment of the present application, based on the schematic diagram of the tail section under the theoretical production state, a theoretically synthesized tail section image, that is, a preset section image, is used as a reference for controlling the sintering endpoint of actual sintering production.

[0061] In some embodiments, when theoretically synthesizing the tail section image, in order to generate an image that is more conducive to data processing, the combustion area corresponding to the combustion zone in the tail section schematic diagram under the theoretical production state is presented as a highlighted portion, and the remaining areas are presented as dark portions, such as Figure 5 As shown, the burning zone is a bright band.

[0062] The embodiment of the present application first obtains a visible light image of the tail section of the sintering trolley in actual sintering production, and determines the actual combustion zone position based on the visible light image.

[0063] In some embodiments, the visible light image may be acquired by the following steps:

[0064] Step 1: continuously collect multiple visible light images of the cross section of the sintering trolley tail.

[0065] In the actual shooting of the imaging device 23, a plurality of consecutive photos may be collected for subsequent secondary processing.

[0066] Step 2: Overlay multiple visible light images to form a secondary processed image.

[0067] By superimposing multiple consecutive photos, a secondary processed image can be formed by taking the average of the overlapping imaging areas.

[0068] Among them, in actual sintering production, local combustion points occasionally appear. For example, in a series of visible light images of sintering sections, a local combustion area appears in one image, while the corresponding combustion area does not appear in the other images. At this time, it can be considered that this local combustion area is caused by uneven fuel distribution in a local area of ​​the sintering mixture, and the image where the local combustion area appears can be eliminated.

[0069] The secondary processed image obtained in this step can filter out noise and more accurately reflect the actual situation of sintering production.

[0070] Step 3: Update the pixel points in the secondary processed image whose brightness is higher than the set value to be highlighted.

[0071] In order to generate an image that is more conducive to data processing, after obtaining the secondary processed image, the image processing system can be used to update the pixel points in the secondary processed image whose brightness is higher than a set value to be highlighted.

[0072] Step 4: Update the pixels in the secondary processed image whose brightness is lower than or equal to the set value to black.

[0073] In order to generate an image that is more conducive to data processing, after obtaining the secondary processed image, the image processing system can be used to update the pixel points in the secondary processed image whose brightness is lower than or equal to the set value to black.

[0074] Step five: obtaining the visible light image.

[0075] The visible light image obtained by the above method avoids excessive noise, better reflects the tail section of actual sintering production, and is more conducive to determining the actual combustion zone position.

[0076] In some embodiments, if a burning area appears in the visible light image and is located at an isolated position, the burning area is filtered, wherein the isolated position is a region that is higher than 1 / 3 of the material layer thickness relative to the bottom of the trolley.

[0077] Specifically, an isolated combustion area appears in the upper part of the visible light image away from the combustion zone and close to the material surface of the sintering trolley (for example, an area that is more than 1 / 3 of the material layer thickness relative to the bottom plane of the trolley). That is, the isolated position is an area that is more than 1 / 3 of the material layer thickness relative to the bottom of the trolley, and it can be selected to filter it to remove noise.

[0078] See also Figure 6 , which is a schematic diagram of actual sintering cross-section imaging provided in an embodiment of the present application. After updating the pixel points with brightness higher than the set value to highlighted and the pixel points with brightness lower than or equal to the set value to black, the actual combustion zone position is shown as the highlighted zone in the figure. The actual combustion zone position can be quickly determined during subsequent data processing.

[0079] In other possible implementations, the data processing system can also be controlled to determine the actual combustion zone position based on the visible light image directly captured by the imaging device. For example, the actual combustion area is usually highlighted in orange and white, and this embodiment of the present application does not specifically limit this.

[0080] After determining the actual combustion zone position, it is determined whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image.

[0081] In some embodiments, the following method may be used to determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold:

[0082] The first step is to establish a rectangular coordinate system with the width of the tail section as the x-axis and the height of the tail section and the direction from the bottom of the trolley to the material surface as the y-axis.

[0083] Since the preset combustion zone is a straight line segment area, and the actual combustion zone is usually a long strip of irregular area, a rectangular coordinate system is established to illustrate how to calculate the distance between the two.

[0084] Among them, the width direction of the tail section is the x-axis, and the height of the tail section and the direction from the bottom of the trolley to the material surface is the y-axis. This is only an example in this implementation. In other possible implementations, different coordinate systems can also be used to calculate the distance between the actual combustion zone position and the preset combustion zone position.

[0085] The second step is to take the arithmetic average of the y-coordinate values ​​of each point in the highlighted area where the actual burning zone is located to obtain the center line of the actual burning zone.

[0086] Take the arithmetic average of the y-coordinate values ​​of each point in the highlighted area where the actual burning zone is located to obtain the arithmetic mean of the actual burning zone. The arithmetic mean of y = the actual burning zone is taken as the center line of the actual burning zone, and the value of the midline is the arithmetic mean of the actual burning zone.

[0087] The third step is to take the arithmetic average of the y-coordinate values ​​of each point in the highlighted area where the preset burning zone is located to obtain the center line of the preset burning zone.

[0088] Take the arithmetic average of the y-coordinate values ​​of each point in the highlighted area where the preset combustion zone is located to obtain the arithmetic mean of the preset combustion zone. y = the arithmetic mean of the preset combustion zone is taken as the center line of the preset combustion zone, and the value of the midline is the arithmetic mean of the preset combustion zone.

[0089] Step 4: Calculate the difference between the actual combustion zone centerline value and the preset combustion zone centerline value.

[0090] At this time, the actual combustion zone centerline and the preset combustion zone centerline are both straight lines parallel to the x-axis. The difference between the actual combustion zone centerline value and the preset combustion zone centerline value is calculated to determine the distance between the actual combustion zone centerline and the preset combustion zone centerline.

[0091] Among them, when calculating the difference between the actual combustion zone centerline value and the preset combustion zone centerline value, the larger centerline value is subtracted from the smaller centerline value.

[0092] For example, if the actual burning zone centerline value is greater than the preset burning zone centerline value, the difference between the two is the actual burning zone centerline value minus the preset burning zone centerline value; if the actual burning zone centerline value is less than the preset burning zone centerline value, the difference between the two is the preset burning zone centerline value minus the actual burning zone centerline value.

[0093] Exemplarily, when the direction from the bottom of the trolley to the material surface is the positive direction of the y-axis, the origin can be set below the preset combustion zone. For example, the origin is set on the bottom of the sintering trolley. The thickness of the base material can be regarded as a constant, generally 100 mm. The base material is sintered ore and will not burn again. The thickness of the combustion zone is generally 200-300 mm when moving from top to bottom. In the preset cross-sectional image, the sintered ore breaks at the tail of the machine, and the combustion zone reaches the base material layer with a remaining thickness of 100 mm. At this time, the origin is in the coordinate system at the bottom of the sintering trolley, and the x-axis can be regarded as the 0 line. Since the preset combustion zone is a straight line segment area under the ideal production state, the center line of the preset combustion zone is a straight line 150 mm higher than the 0 line in the y-axis direction, such as Figure 7As shown, the preset combustion zone centerline can be taken as a=150mm; the actual combustion zone centerline is taken as b, and the actual combustion zone centerline is higher than the preset combustion zone centerline in the positive direction of the y-axis, that is, b>a, and the difference between the two is b-a.

[0094] The above method is used to calculate the distance between the actual combustion zone position and the preset combustion zone position, which can more accurately reflect the gap between the actual combustion zone position and the preset combustion zone position when the cross-sectional area corresponding to the actual combustion zone is an irregular long strip shape.

[0095] After determining the distance between the actual combustion zone position and the preset combustion zone position, it is determined whether the distance between the two is greater than a preset threshold.

[0096] If the distance between the actual combustion zone position and the preset combustion zone position is greater than the preset threshold, it means that after the sintering material surface is ignited to form the combustion zone, the combustion zone has not reached the bottom material layer of the sintering trolley until the trolley moves to the tail of the sintering machine. In this case, the vertical sintering speed needs to be increased or the sintering time needs to be extended.

[0097] The preset threshold is a constant, such as 100 mm.

[0098] like Figure 8 As shown, Figure 8 Exemplarily show Figure 6 The actual tail section diagram is shown. Figure 6 The actual combustion zone position in the actual sintering section imaging diagram determines that the actual combustion zone centerline b is greater than the preset combustion zone centerline a, and b–a>a0, a0 is the preset threshold. At this time, the actual tail section below the actual combustion zone is a mixture, that is, there is still raw material at the tail of the sintering machine that has not been roasted, and it is necessary to increase the vertical sintering speed or extend the sintering time.

[0099] If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, it reflects that the current sintering machine is fully utilized and production does not need to be adjusted, and the control operation is terminated.

[0100] In addition, in some embodiments, before determining the actual burnt zone position based on the visible light image, it is also possible to detect whether a burnt zone exists in the visible light image.

[0101] In actual sintering production, overburning also exists, that is, the actual sintering end position is much forward of the preset sintering end position. Before the sintering trolley moves to the tail of the sintering machine, the combustion zone has reached the bottom material layer of the sintering trolley. At the material dumping point at the tail of the machine, the material has been roasted and there is no combustion area. At this time, the combustion zone cannot be detected in the visible light image of the tail section.

[0102] It can be seen that if the combustion zone cannot be detected in the visible light image, it is necessary to slow down the vertical sintering speed or shorten the sintering time.

[0103] The following is a system embodiment of the present application, which can be used to execute the method embodiment of the present application. For details not disclosed in the system embodiment of the present application, please refer to the method embodiment of the present application.

[0104] Fig. 9 The schematic diagram of the structure of a sintering endpoint control system provided in the embodiment of the present application is shown as an example. Fig. 9 As shown, the system has the function of realizing the above sintering endpoint control method, and the function can be realized by hardware or by hardware executing corresponding software. The system can include a central control system and an imaging device installed on the tail platform of the sintering machine.

[0105] The imaging device is used to obtain a visible light image of the tail section of the sintering trolley in actual sintering production, and transmit the visible light image to the central control system.

[0106] In some possible implementations, the imaging device further includes an image processor, the visible light image may be an image after image processing, and the imaging device is used to:

[0107] Continuously collect multiple visible light images of the cross section of the sintering trolley tail.

[0108] Using an image processor, multiple visible light images are superimposed to form a secondary processed image.

[0109] Using an image processor, pixels in the secondary processed image whose brightness is higher than a set value are updated to be highlighted.

[0110] Using an image processor, pixels in the secondary processed image whose brightness is lower than or equal to a set value are updated to black.

[0111] Obtain visible light images and send them to the central control system.

[0112] In other possible implementations, the visible light image may also be an image directly photographed by an imaging device, which is sent to a central control system for further processing.

[0113] The central control system is configured to:

[0114] S1. Obtaining a visible light image of a tail section of a sintering trolley in actual sintering production collected by an imaging device.

[0115] S2. Determine the actual burning zone position according to the visible light image.

[0116] S3. Determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold value, wherein the preset combustion zone position is the position of the combustion zone in a preset cross-sectional image, and the preset cross-sectional image is a theoretically synthesized tail cross-sectional image when the sintering end point is at the preset sintering end point position.

[0117] S4. If the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the vertical sintering speed is increased or the sintering time is extended.

[0118] In some possible implementations, the central control system is further configured to:

[0119] If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, the control operation is terminated.

[0120] In some possible implementations, the central control system is further configured to:

[0121] Detecting whether there is a burning zone in the visible light image;

[0122] If the combustion zone cannot be detected in the visible light image, the vertical sintering speed is slowed down or the sintering time is shortened.

[0123] It can be seen from the above technical scheme that the embodiment of the present application provides a sintering end point control method and system, which determines the actual combustion zone position according to the collected visible light image of the tail section; judges whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a theoretically synthesized tail section image when the sintering end point is at the preset sintering end point position; if the distance between the actual combustion zone position and the preset combustion zone position is greater than the preset threshold, the vertical sintering speed is accelerated or the sintering time is extended.

[0124] The embodiment of the present application takes a visible light image of the tail section of the machine, processes the real image to determine the actual combustion zone position, and judges the sintering production process according to the distance between the actual combustion zone position and the preset combustion zone position. The distance between the two is used as a feedback control factor to control the actual sintering end point position to be reasonably stabilized at the preset sintering end point position, thereby achieving maximization of the sintering process output and optimization of quality.

[0125] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A sintering endpoint control method, characterized in that: include: Obtain visible light images of the tail section of the sintering trolley in actual sintering production; Determining the actual burning zone position according to the visible light image; Determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a tail cross-sectional image theoretically synthesized when the sintering end point is at the preset sintering end point position; If the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the vertical sintering speed is accelerated or the sintering time is extended; Before determining the actual burning zone position according to the visible light image, the method further includes: Detect whether there is a combustion zone in the visible light image; if the combustion zone cannot be detected in the visible light image, slow down the vertical sintering speed or shorten the sintering time.

2. A sintering endpoint control method according to claim 1, characterized in that: The method of obtaining a visible light image of a tail section of a sintering trolley in actual sintering production comprises: Continuously collect multiple visible light images of the tail section of the sintering trolley; Overlaying multiple visible light imaging images to form a secondary processed imaging image; Updating the pixel points in the secondary processed image with brightness higher than a set value to be highlighted; Update the pixel points in the secondary processed image whose brightness is lower than or equal to the set value to black; The visible light image is obtained.

3. A sintering endpoint control method according to claim 2, characterized in that: The determining whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold value includes: A rectangular coordinate system is established with the width of the tail section as the x-axis and the height of the tail section and the direction from the bottom of the trolley to the material surface as the y-axis; Take the arithmetic average of the y coordinate values ​​of each point in the highlighted area where the actual burning zone is located to obtain the center line of the actual burning zone; Take the arithmetic average of the y coordinate values ​​of each point in the highlighted area where the preset burning zone is located to obtain the center line of the preset burning zone; Calculate the difference between the actual burning zone centerline value and the preset burning zone centerline value; It is determined whether the difference is greater than a preset threshold.

4. A sintering endpoint control method according to claim 2, characterized in that: Determining the actual burning zone position according to the visible light image comprises: The actual burning zone position is determined according to the highlighted area in the visible light image.

5. The sintering endpoint control method according to claim 1, characterized in that: After determining whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the method further includes: If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, the control operation is terminated.

6. The sintering endpoint control method according to claim 1, characterized in that: Also includes: If a burning area appears in the visible light image and the burning area is located in an isolated position, filtering the burning area; The isolated position is an area that is higher than 1 / 3 of the material layer thickness relative to the bottom of the trolley.

7. A sintering endpoint control system, characterized in that: The invention comprises a central control system and an imaging device installed on the tail platform of the sintering machine, wherein the imaging device is used to obtain a visible light image of the tail section of the sintering trolley in actual sintering production, and the central control system is configured as follows when executing the sintering endpoint control method according to any one of claims 1 to 6: Obtaining a visible light image of the tail section of the sintering trolley in actual sintering production collected by an imaging device; Determining the actual burning zone position according to the visible light image; Determine whether the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, wherein the preset combustion zone position is the position of the combustion zone in the preset cross-sectional image, and the preset cross-sectional image is a tail cross-sectional image theoretically synthesized when the sintering end point is at the preset sintering end point position; If the distance between the actual combustion zone position and the preset combustion zone position is greater than a preset threshold, the vertical sintering speed is accelerated or the sintering time is extended; Before determining the actual burning zone position according to the visible light image, the method further includes: Detect whether there is a combustion zone in the visible light image; if the combustion zone cannot be detected in the visible light image, slow down the vertical sintering speed or shorten the sintering time.

8. A sintering endpoint control system according to claim 7, characterized in that: The central control system is further configured to: If the distance between the actual combustion zone position and the preset combustion zone position is less than or equal to the preset threshold, the control operation is terminated.

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