A method and system for judging sintering penetration in sintering production

Abstract

The present application provides a method and system for judging sintering penetration in sintering production. Based on the thermal imaging image of the cross-section at the tail of the sintering machine, using a preset first temperature range and a preset second temperature range, the temperature distribution of the cross-section at the tail is formed; it is judged whether the temperature distribution includes a first actual temperature zone; if the temperature distribution does not include the first actual temperature zone, then the highest temperature on the average middle line of the second actual temperature zone is calculated; if this highest temperature does not reach the preset threshold temperature, then there is over-sintering in the current sintering production; if this highest temperature reaches the preset threshold temperature, it is judged that the sintering penetration position in the current sintering production is appropriate, and the advance of the sintering end point is within a reasonable range. The sintering penetration situation of the actual sintering production is judged through the temperature distribution of the cross-section at the tail, so as to solve the technical problems of the existing manual method for judging sintering penetration, which has low efficiency and poor accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of iron and steel smelting, and particularly relates to a method and system for judging sintering penetration in sintering production. Background Art

[0002] With the rapid development of modern industry, the scale of iron and steel production is getting larger and larger, energy consumption is also increasing, and energy conservation and environmental protection indicators are becoming increasingly important factors in the iron and steel production process. In iron and steel production, iron-containing raw material ores need to be processed by a sintering system before entering the blast furnace for smelting. That is, various powdered iron-containing raw materials are mixed with appropriate amounts of fuel and flux, and an appropriate amount of water is added. After mixing and pelletizing, they are placed on a sintering trolley for roasting, causing a series of physical and chemical changes to form sinter ore that is easy to smelt. This process is called sintering.

[0003] During the sintering process, the mixture is spread onto the sintering trolley of the sintering table by a feeder, and an induced draft fan draws air in from top to bottom to burn the fuel in the mixture layer. From top to bottom, it proceeds continuously. As Figure 1 shown, as the sintering trolley 1 moves, the ignited combustion zone 11 gradually moves downward. The mixture passed through by the combustion zone is roasted into sinter ore. As Figure 2 shown, the sintering material layer is divided into four zones from top to bottom: sinter ore zone 10, combustion zone 11, mixture zone 12, and bedding zone 13. Among them, the combustion zone 11 has the highest temperature.

[0004] The sintering end point is an important process parameter closely related to sintering quality, output, and cost, and it is used to indicate that the material layer on the sintering machine trolley is completely sintered through (i.e., sintering is completed). The fuel is just sintered through at the tail end of the sintering machine, and the sintered-through position is a preset fixed position. Its suitability and stability are the key to improving the finished product rate and making full use of the sintering area. If the sintered-through position is ahead of the desired position, it indicates over-sintering, and the production capacity of the sintering machine is not fully utilized, resulting in a reduction in the output of sinter ore; if the sintered-through position lags behind the desired position, it means that the mixture on the trolley has been discharged at the discharge end of the tail end of the machine before it has had time to be completely sintered through, resulting in under-sintering, ultimately affecting the quality of sinter ore. Summary of the Invention

[0005] The present application provides a method and system for judging sintering penetration in sintering production, which can be used to solve the technical problems of the existing manual method for judging sintering penetration, which has low efficiency and poor accuracy.

[0006] The first aspect of the present application provides a method for judging sintering penetration in sintering production, including:

[0007] Obtaining a thermal imaging image of the cross-section at the tail end of the sintering machine during actual sintering production;

[0008] Based on the thermal imaging image, using a preset first temperature range and a preset second temperature range, divide the tail section to form the temperature distribution of the tail section, where the preset first temperature range is used to characterize the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range;

[0009] Judge whether the temperature distribution includes a first actual temperature zone, and the first actual temperature zone represents the cross-sectional area corresponding to the preset first temperature range;

[0010] If the temperature distribution does not include the first actual temperature zone, calculate the highest temperature on the average middle line of the second actual temperature zone, and the second actual temperature zone represents the cross-sectional area corresponding to the preset second temperature range;

[0011] If the highest temperature does not reach the preset threshold temperature, there is overburning in the current sintering production.

[0012] Combined with the first aspect, in a feasible implementation manner of the first aspect, the calculating the highest temperature on the average middle line of the second actual temperature zone includes:

[0013] Taking the width direction 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, establish a rectangular coordinate system;

[0014] Take the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the second actual temperature zone to obtain the middle line of the second actual temperature zone;

[0015] Take the arithmetic mean of the y-coordinate values of each point on the middle line of the second actual temperature zone to obtain the average middle line of the second actual temperature zone;

[0016] Determine the highest temperature on the average middle line of the second actual temperature zone.

[0017] Combined with the first aspect, in a feasible implementation manner of the first aspect, after judging whether the temperature distribution includes the first actual temperature zone, it further includes:

[0018] If the temperature distribution includes the first actual temperature zone, judge whether there is a second actual temperature zone between the first actual temperature zone and the bedding material zone;

[0019] If there is a second actual temperature zone between the first actual temperature zone and the bedding material zone, there is underburning in the current sintering production.

[0020] Combined with the first aspect, in a feasible implementation manner of the first aspect, after judging whether there is a second actual temperature zone between the first actual temperature zone and the bedding material zone, it further includes:

[0021] If there is no second actual temperature zone between the first actual temperature zone and the bed material, calculate the average center line of the first actual temperature zone;

[0022] Determine whether the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is greater than a preset threshold;

[0023] If the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is greater than the preset threshold, there is underburning in the current sintering production;

[0024] Wherein, the preset first temperature zone is the cross-sectional area corresponding to the preset first temperature range determined according to the preset thermal imaging map of the machine tail section, and the preset thermal imaging map of the machine tail section is the theoretically synthesized thermal imaging map of the machine tail section when the burning-through position is at the preset burning-through position.

[0025] Combined with the first aspect, in an implementable manner of the first aspect, the average center line of the first actual temperature zone and the preset average center line of the first temperature zone are determined by the following method:

[0026] Taking the machine tail section width direction as the x-axis and the machine tail section height and the direction from the bottom of the trolley to the material surface as the y-axis, establish a rectangular coordinate system;

[0027] Taking the arithmetic mean of the highest and lowest y-coordinates among the points with the same x-coordinate in the first actual temperature zone or the preset first temperature zone to obtain the center line of the corresponding temperature zone;

[0028] Taking the arithmetic mean of the y-coordinate values of each point in the center line to obtain the average center line of the corresponding temperature zone.

[0029] Combined with the first aspect, in an implementable manner of the first aspect, after determining whether the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is greater than the preset threshold, it further includes:

[0030] If the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is less than or equal to the preset threshold, the burning-through position in the current sintering production is appropriate.

[0031] Combined with the first aspect, in an implementable manner of the first aspect, the obtaining of the thermal imaging image of the machine tail section of the sintering machine in the actual sintering production includes:

[0032] Continuously collecting multiple thermal imaging maps of the machine tail section of the sintering trolley;

[0033] Overlaying the multiple thermal imaging maps to form a thermal imaging image.

[0034] Combined with the first aspect, in an implementable manner of the first aspect, it further includes:

[0035] If a combustion area appears in the thermal imaging image and the combustion area is located at an isolated position, the combustion area is filtered;

[0036] wherein, the isolated position is an area more than 1 / 3 of the material layer thickness above the bottom of the trolley.

[0037] A burn-through judgment system for sintering production provided in the second aspect of the present application includes a central judgment system and a thermal imaging device installed on the tail platform of the sintering machine. The thermal imaging device is used to obtain a thermal imaging image of the cross-section at the tail of the sintering machine during actual sintering production. When the central judgment system executes the burn-through judgment method for sintering production provided in the first aspect of the present application, it is configured to:

[0038] Obtain a thermal imaging image of the cross-section at the tail of the sintering machine during actual sintering production;

[0039] Based on the thermal imaging image, use a preset first temperature range and a preset second temperature range to divide the cross-section at the tail to form a temperature distribution of the cross-section at the tail. Among them, the preset first temperature range is used to characterize the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range;

[0040] Judge whether the temperature distribution includes a first actual temperature zone, and the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range;

[0041] If the temperature distribution does not include the first actual temperature zone, calculate the highest temperature on the average middle line of the second actual temperature zone, and the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range;

[0042] If the highest temperature does not reach the preset threshold temperature, overburning exists in the current sintering production.

[0043] Combined with the second aspect, in a realizable manner of the second aspect, the central judgment system is further configured to:

[0044] Taking the width direction of the cross-section at the tail as the x-axis and the height of the cross-section at the tail and the direction from the bottom of the trolley to the material surface as the y-axis, establish a rectangular coordinate system;

[0045] Take the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the second actual temperature zone to obtain the middle line of the second actual temperature zone;

[0046] Take the arithmetic mean of the y-coordinate values of each point on the middle line of the second actual temperature zone to obtain the average middle line of the second actual temperature zone;

[0047] Determine the highest temperature on the average middle line of the second actual temperature zone.

[0048] As can be seen from the above technical solutions, the present application provides a method and system for judging sintering penetration in sintering production. Based on the thermal imaging image of the cross-section at the tail of the sintering machine, using a preset first temperature range and a preset second temperature range, the temperature distribution of the cross-section at the tail is formed. Among them, the preset first temperature range is used to characterize the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range; it is judged whether the temperature distribution includes a first actual temperature zone, and the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range; if the temperature distribution does not include the first actual temperature zone, then calculate the highest temperature on the midline of the average of the second actual temperature zone, and the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range; if the highest temperature does not reach the preset threshold temperature, then there is over-sintering in the current sintering production.

[0049] The present application judges the sintering penetration of the actual sintering production through the temperature distribution of the cross-section at the tail. When the preset first temperature range does not exist in the thermal imaging of the cross-section at the tail, the forward amplitude of the sintering end point is quantitatively judged through the second actual temperature zone. If the highest temperature on the midline of the average of the second actual temperature zone reaches the preset threshold temperature (for example, 1000 °C), it is judged that the sintering penetration position in the current sintering production is appropriate, and the forward amplitude of its sintering end point is within a reasonable range. If the highest temperature on the midline of the average of the second actual temperature zone does not reach the preset threshold temperature (for example, 1000 °C), it reflects that after the ignition of the sintering material surface forms a combustion zone, until the trolley moves to the tail of the sintering machine, the combustion zone has reached the bottom paving material layer of the sintering trolley, and there is over-sintering in the current sintering production. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 Schematic diagram of sintering production provided by the prior art;

[0051] Figure 2 Schematic diagram of the formation of sinter provided by the prior art;

[0052] Figure 3 Schematic diagram of the completion of sinter provided by the prior art;

[0053] Figure 4 Schematic diagram of the temperature distribution of the cross-section at the tail determined according to the preset thermal imaging image of the cross-section at the tail provided by the embodiment of the present application;

[0054] Figure 5 Schematic diagram of the formation of the cross-section at the tail and thermal imaging provided by the embodiment of the present application;

[0055] Figure 6 Schematic diagram of the temperature distribution of the cross-section at the tail in the actual sintering production provided by the embodiment of the present application;

[0056] Figure 7 Schematic diagram of the tail section in actual sintering production provided by the embodiment of the present application;

[0057] Figure 8 Schematic diagram of the midlines of each temperature zone in the tail section formed in actual sintering production provided by the embodiment of the present application;

[0058] Figure 9 Schematic diagram of the average midlines of each temperature zone in the tail section formed in actual sintering production provided by the embodiment of the present application;

[0059] Figure 10 Schematic diagram of the superposition of the actual average midline of the temperature zone and the preset average midline of the temperature zone provided by the embodiment of the present application;

[0060] Figure 11 Schematic diagram of the structure of the burn-through judgment system for sintering production provided by the embodiment of the present application. Detailed implementation manners

[0061] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0062] Refer to Figure 1 The shown schematic diagram of sintering production is the application scenario of the embodiment of the present application. In this application scenario, controlling the sintering end point is an important means of sintering control, which is used to indicate that the material layer on the sintering trolley is completely burned through. After the mixed material is laid on the sintering trolley 1 during the sintering process, the furnace ignites the sintering mixed material on the uppermost layer of the sintering trolley 1, and the ignited combustion zone 11 starts to move downward from top to bottom. As the sintering trolley 1 moves from the sintering head wheel 2 to the sintering tail wheel 3, the combustion zone 11 gradually moves downward, and the mixed material passed by the combustion zone 11 is roasted into sinter. The burn-through position is a preset fixed position, generally controlled as the second last air box 4 on the sintering trolley 1 to achieve the most reasonable use of the sintering machine area. In the existing enterprise sintering production, it is often judged manually whether the burn-through position is normal, with low efficiency and poor accuracy, which affects the sintering quality.

[0063] To reasonably judge whether the sinter in the sintering production is exactly burned through, the embodiment of the present application provides a burn-through judgment method and system for sintering production, which judges whether the burn-through position of the current sintering production is reasonable according to the temperature distribution of the tail section. The following will describe a burn-through judgment method for sintering production provided by the embodiment of the present application with reference to the accompanying drawings.

[0064] As Figure 2 shown, during the downward movement of the combustion zone 11, the sintering material layer is divided into four zones from top to bottom: the sinter zone 10, the combustion zone 11, the mixed material zone 12, and the bedding zone 13. Among them, the combustion zone 11 has the highest temperature.

[0065] When the bottom of the combustion zone 11 just touches the layer of bedding material, it is the fully burned position. In the theoretical production state, the fully burned position is at a preset fixed position. Since the combustion zone 11 has a certain thickness, when the sintering pallet 1 runs from the preset sintering end position to the tipping position, there is still a thin layer of the combustion zone 11, as Figure 3 shown. The sintered ore is evenly formed, and there is a narrow combustion zone 11 with a straight section near the bedding material belt 13 at the tail of the sintering machine.

[0066] During the sintering production process, air continuously passes through the material layer to supply air to the combustion zone 11. At the same time, the air also cools the sintered ore 10 area above the formed combustion zone 11. In the ideal state, the temperature distribution of the cross-section at the tail of the sintering machine is a temperature distribution that gradually decreases from bottom to top. In the embodiment of the present application, a theoretical synthetic preset cross-sectional thermal imaging diagram of the tail is generated. This preset cross-sectional thermal imaging diagram of the tail is a theoretically synthesized cross-sectional thermal imaging diagram when the fully burned position is at the preset fully burned position, and is used as a reference benchmark for judging the fully burned position in actual sintering production.

[0067] The preset cross-sectional thermal imaging diagram of the tail can be determined by theoretical calculation and corrected with on-site actual data to establish a preset cross-sectional thermal imaging diagram that conforms to the characteristics of each sintering machine. Among them, the on-site actual data includes factors such as the raw material situation, equipment working conditions, and altitude of each sintering machine. The preset cross-sectional thermal imaging diagram of the tail can be specifically set according to the actual situation, and the embodiment of the present application will not elaborate here.

[0068] Referring to Figure 4 , according to the preset cross-sectional thermal imaging diagram of the tail, the temperature distribution of the cross-section at the tail in the ideal state is determined. In the ideal state, the vertical combustion speed at each position of the cross-section at the tail is the same, and the cooling air volume is evenly distributed. Therefore, the boundaries of each temperature zone are straight lines. Among them, as Figure 4 shown, the temperature distribution diagram includes a cross-sectional area corresponding to a preset first temperature range (preset first temperature zone), a cross-sectional area corresponding to a preset second temperature range (preset second temperature zone). The preset first temperature range is used to characterize the temperature range of the combustion zone. The preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range.

[0069] In addition, as Figure 4 shown, the temperature distribution diagram can also include a cross-sectional area corresponding to a preset third temperature range (preset third temperature zone), a cross-sectional area corresponding to a preset fourth temperature range (preset fourth temperature zone). The preset third temperature range is adjacent to the preset second temperature range, the preset fourth temperature range is adjacent to the preset third temperature range, and the upper limit of the preset third temperature range is less than the lower limit of the preset second temperature range, and the upper limit of the preset fourth temperature range is less than the lower limit of the preset third temperature range.

[0070] Exemplarily, the highest temperature in the combustion zone 11 is 1350 °C. When the sintering pallet moves to the tail of the sintering machine, the temperature of the surface sintered ore cools down to 50 °C. Ideally, the preset first temperature range is 1100 - 1350 °C, and the preset thickness of the first temperature zone is 50 mm; the preset second temperature range is 600 - 1100 °C, and the preset thickness of the second temperature zone is 150 mm; the preset third temperature range is 300 - 600 °C, and the preset thickness of the third temperature zone is 250 mm; the preset fourth temperature range is 50 - 300 °C, and the preset thickness of the fourth temperature zone is 300 mm.

[0071] In actual production, due to factors such as the difference in air permeability of the sintering mixture in each area of the sintering pallet and the difference in local fuel ratio, the vertical combustion speed at each position of the cross-section will not be exactly the same. In the embodiment of the present application, a thermal imaging camera is used to obtain the thermal imaging image of the cross-section at the tail of the sintering machine during actual sintering production.

[0072] As Figure 5 shown, the sintering pallet 1 carries the sintered ore 10, and the pallet advances under the drive of the sintering head wheel 2 and the tail wheel 3 of the sintering machine. At the tail of the sintering machine, the sintering pallet 1 starts to tilt, and the continuous sintering material surface starts to break from the tilting part of the pallet. When the tail wheel 3 of the sintering machine drives the pallet to reach the inclination angle A, the whole sintered ore 10 on the tilted pallet slides off the pallet, and the cross-section of the sintered ore of the adjacent pallet, that is, the cross-section 100 at the tail, can be completely shown in front of the thermal imaging device. By installing the thermal imaging device 101 at the platform at the tail of the sintering machine, the thermal imaging map of the cross-section 100 at the tail can be obtained.

[0073] In addition, sensors can be installed at the tail of the sintering machine to track the inclination angle of the sintering pallet 1. When the inclination angle of the sintering pallet 1 reaches A, the thermal imaging device 101 is controlled to take a picture of the cross-section at the tail of the sintered ore machine.

[0074] In some embodiments, the thermal imaging image obtained in the embodiment of the present application can be a processed thermal imaging image, and the processed thermal imaging image can be obtained through the following steps:

[0075] Step 1: Continuously collect multiple thermal imaging maps of the cross-section at the tail of the sintering pallet.

[0076] In the actual shooting of the thermal imaging device 101, multiple consecutive photos can be collected for subsequent secondary processing.

[0077] It should be noted that the thermal imaging map refers to the photo of the cross-section at the tail directly taken by the thermal imaging device 101.

[0078] Step 2: Stack multiple thermal imaging maps for secondary processing to form a thermal imaging image.

[0079] By stacking multiple consecutive thermal imaging maps, a thermal imaging image can be formed by using the method of overlapping and averaging the imaging areas.

[0080] Among them, in actual sintering production, local combustion points may occasionally occur. For example, in a series of consecutive thermal imaging images, there is one image with a local combustion area, while the corresponding combustion area does not exist in the remaining 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 with the local combustion area can be excluded.

[0081] In the actual system configuration, an image processor can be built into the thermal imaging device 101, and the image processor in the thermal imaging device 101 can perform secondary processing operations on a series of continuously acquired thermal imaging images. Alternatively, an image processor connected to the camera signal can be configured outside the thermal imaging device 101 to perform secondary processing operations.

[0082] The thermal imaging images obtained by the above method avoid excessive noise, better reflect the temperature of the tail section in actual sintering production, and are more conducive to the subsequent determination of the burn-through position.

[0083] In some embodiments, if a combustion area appears in the thermal imaging image and the combustion area is located at an isolated position, the combustion area is filtered. Among them, the isolated position is an area higher than 1 / 3 of the material layer thickness relative to the bottom of the trolley.

[0084] Specifically, if an isolated combustion area appears in the upper part of the thermal imaging image far from the combustion zone and close to the material surface of the sintering trolley (for example, an area higher than 1 / 3 of the material layer thickness relative to the bottom plane of the trolley), that is, the isolated position is an area higher than 1 / 3 of the material layer thickness relative to the bottom of the trolley, it can be selected to be filtered to remove noise.

[0085] After obtaining the thermal imaging image, based on the thermal imaging image, using a preset first temperature range and a preset second temperature range, the tail section is divided to form the temperature distribution of the tail section.

[0086] In some embodiments, the tail section can also be divided using a preset third temperature range and a preset fourth temperature range.

[0087] As Figure 6 shown, an exemplary schematic diagram of the temperature distribution of the tail section in actual sintering production is provided in an embodiment of the present application. The temperature of each point in the section is determined according to the thermal imaging image of the tail section, and then the tail section is divided using a preset first temperature range, a preset second temperature range, a preset third temperature range, and a preset fourth temperature range to form a temperature distribution diagram as Figure 6 shown.

[0088] The temperature distribution map includes a first actual temperature zone, a second actual temperature zone, a third actual temperature zone, and a fourth actual temperature zone. The first actual temperature zone represents the cross-sectional area corresponding to a preset first temperature range, the second actual temperature zone represents the cross-sectional area corresponding to a preset second temperature range, the third actual temperature zone represents the cross-sectional area corresponding to a preset third temperature range, and the fourth actual temperature zone represents the cross-sectional area corresponding to a preset fourth temperature range.

[0089] It should be noted that in actual sintering production, the temperature distribution of the cross-section at the tail of the machine may include multiple first actual temperature zones or second actual temperature zones. That is to say, the first actual temperature zone and the second actual temperature zone may not be continuous in a cross-section at the tail of the machine. For example Figure 7 as shown, exemplarily reflecting Figure 6 the schematic diagram of the cross-section at the tail of the machine corresponding to, the first actual temperature zone is the temperature range of the combustion zone, and the second actual temperature zones on both sides of the trolley are below the first actual temperature zone, that is, the combustion zone. It can be deduced that the combustion zone on both sides of the trolley has not advanced to the layer of bedding material. The second actual temperature zones below the first actual temperature zones on both sides are still raw materials of sintering mixture and have not been roasted into sinter. The second actual temperature zone, the third actual temperature zone, and the fourth actual temperature zone above the combustion zone have all formed sinter.

[0090] After determining the temperature distribution of the cross-section at the tail of the machine, it is judged whether the temperature distribution includes the first actual temperature zone. It should be noted that in actual sintering production, there is an overburning phenomenon, that is, the actual sintering end position is much ahead of the preset sintering end position. When the sintering trolley moves to before the tail of the sintering machine, the combustion zone has reached the layer of bedding material at the bottom of the sintering trolley. At the tail discharging place, the material has been roasted and there is no combustion area. At this time, the temperature distribution does not include the first actual temperature zone.

[0091] Therefore, if the temperature distribution does not include the first actual temperature zone, the highest temperature on the average center line of the second actual temperature zone is calculated. If the highest temperature does not reach the preset threshold temperature (for example, 1000 °C), it reflects that after the ignition of the sintering material surface forms a combustion zone, until the trolley moves to before the tail of the sintering machine, the combustion zone has reached the layer of bedding material at the bottom of the sintering trolley, and there is overburning in the current sintering production.

[0092] It should be noted that if the cross-section at the tail of the machine is visible light imaging, at this time the cross-section at the tail of the machine is completely black and the combustion zone cannot be detected. In this case, only a logical judgment can be made that the sintering end is ahead (that is, the sinter has been completely roasted when the trolley arrives at the tail of the machine), but how much ahead cannot be quantitatively judged, and only the sintering production can be adjusted. After seeing the bright line in the visible light image of the cross-section at the tail of the machine, parameter feedback adjustment is made according to the position of the bright line. However, in the thermal imaging scheme, the same situation can make parameter feedback adjustment according to the average center line of the second actual temperature zone.

[0093] If the temperature distribution does not include the first actual temperature zone, but the highest temperature on the average center line of the second actual temperature zone reaches the preset threshold temperature (e.g., 1000 °C), it is determined that the sintering penetration position in the current sintering production is appropriate, and the degree of the sintering end point being ahead is within a reasonable range.

[0094] In some embodiments, the following method can be used to calculate the highest temperature on the average center line of the second actual temperature zone:

[0095] First step, taking the width direction of the tail cross-section as the x-axis and the height of the tail cross-section and the direction from the bottom of the trolley to the material surface as the y-axis, a rectangular coordinate system is established.

[0096] Among them, taking the width direction of the tail cross-section as the x-axis and the height of the tail cross-section and the direction from the bottom of the trolley to the material surface as the y-axis is only an example in this embodiment. In other possible embodiments, different coordinate systems can also be used for calculation.

[0097] Second step, taking the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the second actual temperature zone to obtain the center line of the second actual temperature zone.

[0098] That is to say, on the second actual temperature zone, the corresponding intermediate value y is selected for each x-coordinate, and the arithmetic mean values y corresponding to different x are connected into a line as the center line of the second actual temperature zone.

[0099] Third step, taking the arithmetic mean of the y-coordinate values of each point on the center line of the second actual temperature zone to obtain the average center line of the second actual temperature zone.

[0100] That is to say, calculate the arithmetic mean of the y-coordinate values of each point on the center line. Taking y = this arithmetic mean value as the average center line of the second actual temperature zone, the value of the average center line of the second actual temperature zone is this arithmetic mean value, and the average center line of the second actual temperature zone is parallel to the x-axis.

[0101] Fourth step, determine the highest temperature on the average center line of the second actual temperature zone.

[0102] Using the above method to perform image processing on the second actual temperature zone and using the average center line of the second actual temperature zone to represent the second actual temperature zone can filter out accidental factors and simply reflect the real sintering situation.

[0103] In some embodiments, after determining whether the temperature distribution includes the first actual temperature zone, it further includes:

[0104] If the temperature distribution includes a first actual temperature zone, it is determined whether there is a second actual temperature zone between the first actual temperature zone and the burden layer belt. If there is a second actual temperature zone between the first actual temperature zone and the burden layer belt, it indicates that when the sintering pallet moves to the end of sintering, there is still raw sintering mixture, and it is necessary to increase the vertical sintering speed or slow down the pallet speed or reduce the thickness of the sintering material layer, and there is underburning in the current sintering production.

[0105] In some embodiments, after determining whether there is a second actual temperature zone between the first actual temperature zone and the burden layer belt, it further includes:

[0106] If there is no second actual temperature zone between the first actual temperature zone and the burden layer, the average center line of the first actual temperature zone is calculated; it is determined whether the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is greater than a preset threshold; if the distance between the average center line of the first actual temperature zone and the preset average center line of the first temperature zone is greater than the preset threshold, it reflects that after ignition of the sintering material surface to form a combustion zone, until the pallet moves to the end of the sintering machine, the combustion zone has not reached the burden layer at the bottom of the sintering pallet; it is necessary to increase the vertical sintering speed or extend the sintering time or reduce the thickness of the sintering material layer, and there is underburning in the current sintering production.

[0107] Wherein, the preset first temperature zone is a cross-sectional area corresponding to a preset first temperature range determined according to a preset thermal imaging diagram of the machine tail section, and the preset thermal imaging diagram of the machine tail section is a theoretically synthesized thermal imaging diagram of the machine tail section when the burn-through position is at the preset burn-through position.

[0108] Wherein, the average center line of the first actual temperature zone and the preset average center line of the first temperature zone can be determined by the following method:

[0109] Step 1, taking the width direction of the machine tail section as the x-axis and the height of the machine tail section and the direction from the bottom of the pallet to the material surface as the y-axis, a rectangular coordinate system is established.

[0110] Wherein, taking the width direction of the machine tail section as the x-axis and the height of the machine tail section and the direction from the bottom of the pallet to the material surface as the y-axis is only an example in this embodiment. In other possible embodiments, different coordinate systems can also be used for calculation.

[0111] Step 2, taking the arithmetic mean of the highest and lowest y-coordinates among the points with the same x-coordinate in the first actual temperature zone or the preset first temperature zone to obtain the center line of the corresponding temperature zone.

[0112] That is to say, on the first actual temperature zone or the preset first temperature zone, the corresponding intermediate value y of each x-coordinate is selected, and the arithmetic mean values y corresponding to different x are connected into a line as the center line of the first actual temperature zone or the preset first temperature zone.

[0113] Such as Figure 8As shown, it includes the midline of the first actual temperature zone and the midline of the second actual temperature zone, where the midline of the second actual temperature zone is only marked exemplarily.

[0114] Step 3: Take the arithmetic mean of the y-coordinate values of each point on the midline to obtain the average midline of the corresponding temperature zone.

[0115] That is to say, calculate the arithmetic mean of the y-coordinate values of each point on the midline, and use y = this arithmetic mean value as the average midline of the corresponding temperature zone. The value of the average midline of the first actual temperature zone is the arithmetic mean of the y-coordinate values of each point on the midline of the first actual temperature zone, and the preset value of the average midline of the first temperature zone is the arithmetic mean of the y-coordinate values of each point on the preset midline of the first temperature zone. The average midlines are all parallel to the x-axis.

[0116] See Figure 9 and Figure 10 , where the average midline of the second actual temperature zone is only marked exemplarily. Use the absolute value of the difference between the value of the average midline of the first actual temperature zone and the preset value of the average midline of the first temperature zone to represent the distance between the average midline of the first actual temperature zone and the preset average midline of the first temperature zone, that is, |W1 – w1|, and judge whether |W1 – w1| is greater than w0, where w0 is a constant, such as 100 mm. If |W1 – w1| > w0, it reflects that after ignition on the sintering material surface forms a combustion zone, until the trolley moves to the tail of the sintering machine, the combustion zone has not reached the bottom bedding layer of the sintering trolley; it is necessary to increase the vertical sintering speed or extend the sintering time or reduce the thickness of the sintering material layer, and there is underburning in the current sintering production.

[0117] In some embodiments, after judging whether the distance between the average midline of the first actual temperature zone and the preset average midline of the first temperature zone is greater than a preset threshold, it further includes:

[0118] If the distance between the average midline of the first actual temperature zone and the preset average midline of the first temperature zone is less than or equal to the preset threshold, the burn-through position in the current sintering production is appropriate.

[0119] The following is an embodiment of the system of the present application, which can be used to execute the method embodiment of the present application. For the details not disclosed in the system embodiment of the present application, please refer to the method embodiment of the present application.

[0120] See Figure 11 , the embodiment of the present application provides a burn-through judgment system for sintering production. As Figure 11 shown, this system has the function of implementing the above-mentioned burn-through judgment method for sintering production. This function can be implemented by hardware or by hardware executing corresponding software. This system can include a central judgment system and a thermal imaging device installed on the tail platform of the sintering machine. This thermal imaging device is used to obtain the thermal imaging image of the cross-section at the tail of the sintering machine in actual sintering production.

[0121] The central judgment system is configured to perform the following operations:

[0122] S1. Obtain a thermal imaging image of the cross-section at the tail of the sintering machine in actual sintering production.

[0123] S2. Based on the thermal imaging image, use a preset first temperature range and a preset second temperature range to divide the cross-section at the tail, forming a temperature distribution of the cross-section at the tail, where the preset first temperature range is used to represent the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range.

[0124] S3. Determine whether the temperature distribution includes a first actual temperature zone, where the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range.

[0125] S4. If the temperature distribution does not include the first actual temperature zone, calculate the highest temperature on the average middle line of the second actual temperature zone, where the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range.

[0126] S5. If the highest temperature does not reach the preset threshold temperature, there is overburning in the current sintering production.

[0127] The central judgment system is further configured to:

[0128] Establish a rectangular coordinate system with the width direction of the cross-section at the tail as the x-axis and the height of the cross-section at the tail and the direction from the bottom of the trolley to the material surface as the y-axis;

[0129] Take the arithmetic mean of the highest and lowest y-coordinates among the points with the same x-coordinate in the second actual temperature zone to obtain the middle line of the second actual temperature zone;

[0130] Take the arithmetic mean of the y-coordinate values of each point on the middle line of the second actual temperature zone to obtain the average middle line of the second actual temperature zone;

[0131] Determine the highest temperature on the average middle line of the second actual temperature zone.

[0132] As can be seen from the above technical solutions, the embodiments of the present application provide a method and system for judging sintering penetration in sintering production. According to the thermal imaging image of the cross-section at the tail of the sintering machine, using a preset first temperature range and a preset second temperature range, the temperature distribution of the cross-section at the tail is formed. Among them, the preset first temperature range is used to represent the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range; it is judged whether the temperature distribution includes a first actual temperature zone, and the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range; if the temperature distribution does not include the first actual temperature zone, then calculate the highest temperature on the average midline of the second actual temperature zone, and the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range; if the highest temperature does not reach the preset threshold temperature, then there is overburning in the current sintering production.

[0133] The embodiments of the present application judge the sintering penetration of the actual sintering production through the temperature distribution of the cross-section at the tail. When the preset first temperature range does not exist in the thermal imaging of the cross-section at the tail, the forward amplitude of the sintering end point is quantitatively judged through the second actual temperature zone. If the highest temperature on the average midline of the second actual temperature zone reaches the preset threshold temperature (such as 1000 °C), it is judged that the sintering penetration position in the current sintering production is appropriate, and the forward amplitude of its sintering end point is within a reasonable range. If the highest temperature on the average midline of the second actual temperature zone does not reach the preset threshold temperature (such as 1000 °C), it reflects that after the sintering material surface is ignited to form a combustion zone, before the trolley moves to the tail of the sintering machine, the combustion zone has reached the bottom bedding layer of the sintering trolley, and there is overburning in the current sintering production.

[0134] The above has described the present application in detail in combination with specific implementation manners and exemplary examples, but these descriptions should not be construed as limitations on the present application. Those skilled in the art understand that without departing from the spirit and scope of the present application, various equivalent replacements, modifications or improvements can be made to the technical solutions and their implementation manners of the present application, and these all fall within the scope of the present application. The protection scope of the present application is subject to the appended claims.

Claims

1. A method for judging sintering penetration in sintering production, characterized in that, Including: Obtaining a thermal imaging image of the cross-section at the tail of the sintering machine in actual sintering production; Based on the thermal imaging image, using a preset first temperature range and a preset second temperature range, dividing the cross-section at the tail to form a temperature distribution of the cross-section at the tail, where the preset first temperature range is used to characterize the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range; Judging whether the temperature distribution includes a first actual temperature zone, where the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range; If the temperature distribution does not include the first actual temperature zone, then calculating the highest temperature on the average middle line of the second actual temperature zone, where the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range; If the highest temperature does not reach the preset threshold temperature, then there is overburning in the current sintering production; Among them, the calculating the highest temperature on the average middle line of the second actual temperature zone includes: Taking the width direction of the cross-section at the tail as the x-axis and the height of the cross-section at the tail and the direction from the bottom of the trolley to the material surface as the y-axis to establish a rectangular coordinate system; Taking the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the second actual temperature zone to obtain the middle line of the second actual temperature zone; Taking the arithmetic mean of the y-coordinate values of each point in the middle line of the second actual temperature zone to obtain the average middle line of the second actual temperature zone; Determining the highest temperature on the average middle line of the second actual temperature zone.

2. The method for judging sintering penetration in sintering production according to claim 1, characterized in that, After judging whether the temperature distribution includes the first actual temperature zone, it further includes: If the temperature distribution includes the first actual temperature zone, then judging whether there is a second actual temperature zone between the first actual temperature zone and the burden layer; If there is a second actual temperature zone between the first actual temperature zone and the burden layer, then there is underburning in the current sintering production.

3. The method for judging sintering penetration in sintering production according to claim 2, characterized in that After judging whether there is a second actual temperature zone between the first actual temperature zone and the burden layer, it further includes: If there is no second actual temperature zone between the first actual temperature zone and the burden layer, then calculating the average middle line of the first actual temperature zone; Judging whether the distance between the average middle line of the first actual temperature zone and the preset average middle line of the first temperature zone is greater than a preset threshold; If the distance between the average middle line of the first actual temperature zone and the preset average middle line of the first temperature zone is greater than the preset threshold, then there is underburning in the current sintering production; Among them, the preset first temperature zone is the cross-section area corresponding to the preset first temperature range determined according to the preset thermal imaging image of the cross-section at the tail, and the preset thermal imaging image of the cross-section at the tail is the theoretically synthesized thermal imaging image of the cross-section at the tail when the burnout position is at the preset burnout position.

4. A method for judging sintering penetration in sintering production according to claim 3, characterized in that The average middle line of the first actual temperature zone and the preset average middle line of the first temperature zone are determined by the following method: Taking the width direction of the cross-section at the tail as the x-axis and the height of the cross-section at the tail and the direction from the bottom of the trolley to the material surface as the y-axis to establish a rectangular coordinate system; Taking the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the first actual temperature zone or the preset first temperature zone to obtain the middle line of the corresponding temperature zone; Taking the arithmetic mean of the y-coordinate values of each point in the middle line to obtain the average middle line of the corresponding temperature zone.

5. A method for judging sintering penetration in sintering production according to claim 3, characterized in that After determining whether the distance between the average midline of the first actual temperature zone and the preset average midline of the first temperature zone is greater than a preset threshold, the following steps are further included: If the distance between the average midline of the first actual temperature zone and the preset average midline of the first temperature zone is less than or equal to the preset threshold, the burn-through position in the current sintering production is appropriate.

6. A method for judging sintering penetration in sintering production according to claim 1, characterized in that, The obtaining of the thermal imaging image of the cross-section at the tail of the sintering machine in the actual sintering production includes: Continuously collecting multiple thermal imaging images of the cross-section at the tail of the sintering pallet car; Overlaying the multiple thermal imaging images to form a thermal imaging image.

7. A method for judging sintering penetration in sintering production according to claim 1, characterized in that The following steps are further included: If a combustion area appears in the thermal imaging image and the combustion area is located at an isolated position, the combustion area is filtered; Wherein, the isolated position is a region higher than 1 / 3 of the material layer thickness relative to the bottom of the pallet car.

8. A burn-through judgment system for sintering production, characterized in that, It includes a central judgment system and a thermal imaging device installed on the tail platform of the sintering machine. The thermal imaging device is used to obtain the thermal imaging image of the cross-section at the tail of the sintering machine in the actual sintering production. When the central judgment system executes the burn-through judgment method for sintering production described in any one of claims 1 to 7, it is configured to: Obtain the thermal imaging image of the cross-section at the tail of the sintering machine in the actual sintering production; Based on the thermal imaging image, using a preset first temperature range and a preset second temperature range, divide the cross-section at the tail to form the temperature distribution of the cross-section at the tail. Among them, the preset first temperature range is used to characterize the temperature range of the combustion zone, the preset second temperature range is adjacent to the preset first temperature range, and the upper limit of the preset second temperature range is less than the lower limit of the preset first temperature range; Judge whether the temperature distribution includes a first actual temperature zone, and the first actual temperature zone represents the cross-section area corresponding to the preset first temperature range; If the temperature distribution does not include the first actual temperature zone, calculate the highest temperature on the average midline of the second actual temperature zone, and the second actual temperature zone represents the cross-section area corresponding to the preset second temperature range; If the highest temperature does not reach the preset threshold temperature, overburning exists in the current sintering production; Among them, the calculation of the highest temperature on the average midline of the second actual temperature zone includes: Taking the width direction of the cross-section at the tail as the x-axis and the height of the cross-section at the tail and the direction from the bottom of the pallet car to the material surface as the y-axis to establish a rectangular coordinate system; Taking the arithmetic mean of the highest and lowest y-coordinate values among the points with the same x-coordinate in the second actual temperature zone to obtain the midline of the second actual temperature zone; Taking the arithmetic mean of the y-coordinate values of each point on the midline of the second actual temperature zone to obtain the average midline of the second actual temperature zone; Determine the highest temperature on the average midline of the second actual temperature zone.

Images