A method and system for obtaining sintering finish line by partitioning

Abstract

The present invention discloses a method and system for obtaining a sintering end line by partitioning, comprising the following steps: obtaining a thermal image of the actual sintering cross section of the current sintering trolley, wherein the thermal image of the actual sintering cross section has a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, and the thermal image of the actual sintering cross section has a known correlation ratio with the real cross-sectional image of the current sintering trolley; obtaining the current sintered ore temperature value of each target observation temperature zone on the current sintering cross-sectional observation line; calculating and obtaining the sintering cooling distance corresponding to the sintering reference observation point; and obtaining the horizontal sintering end line of each target observation temperature zone based on the sintering cooling horizontal distance corresponding to each target observation temperature zone and the sintering machine tail mark line. The method for obtaining a sintering end line by partitioning provided by the present invention avoids the existing technical problem of only being able to arrange temperature sensors in the sintering bellows, monitor the bellows flue gas temperature by the temperature sensors, and then predict the sintering end point.

Description

Technical Field

[0001] The present invention relates to the field of sintering technology, and in particular to a method and system for obtaining a sintering finish line by partitioning. Background Art

[0002] With the rapid development of modern industry, the scale of steel production is growing, and energy consumption is also increasing. Energy conservation and environmental protection indicators are becoming increasingly important considerations in the steel production process. In steel production, iron-containing raw ore needs to be processed through a sintering system before entering the blast furnace for smelting. This is to process various powdered iron-containing raw materials, add appropriate amounts of fuel (coal powder, coke powder) and flux, add an appropriate amount of water, mix and pelletize, and then place them on a sintering trolley for roasting. This process causes a series of physical and chemical changes to occur, forming a sintered ore that is easy to smelt. This process is called sintering.

[0003] Currently, the sintering endpoint is detected by measuring the flue gas temperature of the sintering bellows. Based on this, the operating conditions of the sintering system are adjusted to ensure that the sintering endpoint is maintained at the second-to-last or third-to-last bellows to ensure the sintering system's operating efficiency. (If the sintering endpoint is set too early, the sintering system will not be fully utilized, resulting in low sintering efficiency; if the sintering endpoint is set too late, the sintering material will not be completely sintered, and raw material will remain at the bottom of the sintering trolley, requiring re-sintering, resulting in low sintering efficiency.) In the prior art, the sintering bellows are large (approximately 2500mm x 4000mm), and each sintering bellows is 4 meters wide in the direction of travel of the sintering machine. Therefore, the existing method of directly determining the sintering endpoint by detecting the inflection point of the sintering bellows flue gas temperature has a resolution of only 4 meters. Furthermore, a temperature sensor must be placed in each bellows, resulting in a complex structure and numerous maintenance procedures. A more accurate endpoint position can only be obtained indirectly by monitoring the bellows flue gas temperature with a temperature sensor and then performing function fitting.

[0004] In view of this, it is necessary to propose a method and system for obtaining the sintering finish line online to alleviate the above-mentioned defects. Summary of the Invention

[0005] The present invention provides a method and system for obtaining a sintering end point line by partitioning, which solves the existing technical problem of only being able to monitor the wind box flue gas temperature through a temperature sensor and thus predicting the sintering end point.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for obtaining a sintering end line by partitioning includes the following steps: S10, obtaining an actual sintering cross-section thermal image of a current sintering trolley, wherein the actual sintering cross-section thermal image has a thermal imaging base material layer and a horizontally arranged thermal imaging proposed target observation line, the thermal imaging proposed target observation line is above the thermal imaging base material layer and has a thermal imaging vertical preset distance from the base material layer, the actual sintering cross-section thermal image and the real cross-section image of the current sintering trolley have a known correlation ratio, the thermal imaging base material layer corresponds to the real base material layer of the real cross-section image, the thermal imaging proposed target observation line corresponds to the current sintering cross-section observation line of the real cross-section image, and the real base material layer and the current sintering cross-section observation line have a sintering reference distance corresponding to the thermal imaging vertical preset distance; S20, obtaining a current sintered ore temperature value Ti of each target observation temperature zone i on the current sintering cross-section observation line, wherein the multiple target observation temperature zones i are evenly arranged along the extension direction of the current sintering cross-section observation line; S30, using the formula Calculate and obtain the sintering cooling horizontal distance corresponding to the target observation temperature zone i, where Tm is the critical sintering material temperature when the sintering state is completed, CRi is the actual cooling rate corresponding to the target observation temperature zone i, Sv is the moving speed of the sintering trolley, and Li is the sintering cooling horizontal distance; S40, obtain the horizontal estimated sintering end line Zi for each target observation temperature zone i based on the sintering cooling horizontal distance corresponding to each target observation temperature zone i and the sintering machine tail line.

[0008] Furthermore, the actual sintering cross-section thermal imaging has a thermal imaging comparison target observation line parallel to the thermal imaging proposed target observation line, the thermal imaging comparison target observation line is above the thermal imaging proposed target observation line, the thermal imaging comparison target observation line corresponds to the temperature difference comparison observation line of the real cross-section image, and the temperature difference comparison observation line has a vertical height difference with the current sintering cross-section observation line; the current comparison temperature value of each target observation temperature zone i on the temperature difference comparison observation line is obtained; the single-zone cooling temperature difference of the same target observation temperature zone i is obtained according to the difference between the current sintered ore temperature value Ti and the current comparison temperature value of each target observation temperature zone i; the vertical height difference between the temperature difference comparison observation line and the current sintering cross-section observation line is obtained; the single-zone cooling time is obtained according to the vertical height difference and the vertical combustion speed; the actual cooling rate CRi corresponding to each target observation temperature zone i is obtained according to the single-zone cooling time and the single-zone cooling temperature difference.

[0009] Furthermore, the actual sintering cross-section thermal imaging has a thermal imaging isothermal observation line, which is above the proposed target observation line of the thermal imaging, and the thermal imaging isothermal observation line corresponds to the isothermal combustion line of the real cross-section image; the isothermal combustion line of each target observation temperature zone i is fitted to obtain a combustion isothermal horizontal line, and the combustion isothermal horizontal line of each target observation temperature zone i is arranged parallel to the current sintering cross-section observation line; the current comparative temperature value of the combustion isothermal horizontal line of each target observation temperature zone i is obtained; the interval cooling temperature difference of the same target observation temperature zone i is obtained based on the difference between the current sintered ore temperature value Ti and the current comparative temperature value of each target observation temperature zone i; the vertical height difference between the temperature difference comparison observation line of each target observation temperature zone i and the current sintering cross-section observation line is obtained; the interval cooling time is obtained based on the vertical height difference and the vertical combustion speed; the actual cooling rate CRi corresponding to each target observation temperature zone i is obtained based on the interval cooling time and the interval cooling temperature difference.

[0010] Furthermore, using the formula Calculate and obtain the actual cooling rate corresponding to each target observation temperature zone i; T'm is the material temperature corresponding to the historical critical sintering material layer in the historical effective sintering section thermal imaging, T'′i is the material temperature of the historical sintering cooling material layer corresponding to the target observation temperature zone i in the historical effective sintering section thermal imaging, Agv is the vertical combustion velocity, the material temperature range corresponding to the historical critical sintering material layer is [1230℃, 1270℃], and the material temperature range of the historical sintering cooling material layer is [600℃, 1200℃].

[0011] Furthermore, the horizontal estimated sintering end line Zi corresponding to each target observation temperature zone i is determined according to the sintering cooling horizontal distance Li, and all the horizontal estimated sintering end lines Zi are linearly fitted to obtain the horizontal estimated sintering end line.

[0012] Furthermore, the method further comprises the step of: the vertical distance between the current sintering cross-section observation line and the actual base material layer is no more than 30 mm.

[0013] Furthermore, if the current temperature interval value of the current sintered ore temperature value Ti is less than the preset ignition temperature threshold, a prompt message is issued.

[0014] Furthermore, multiple frames of historical sintering cross-sectional thermal imaging are obtained that are consistent with the current working conditions of the current sintering trolley; the historical sintering cross-sectional thermal imaging in which each target observation temperature zone i has a historical critical sintering material layer and a historical sintering cooling material layer is determined to be a historical reference sintering cross-sectional thermal imaging; the adjacent area temperature difference of the historical sintering cooling material layer of the adjacent target observation temperature zone i in each historical reference sintering cross-sectional thermal imaging is obtained; the historical reference sintering cross-sectional thermal imaging in which the adjacent area temperature difference is within a preset temperature difference range is determined to be a historical effective sintering cross-sectional thermal imaging.

[0015] Furthermore, the preset temperature difference range is 5 to 50°C.

[0016] The present invention also provides a partitioned sintering finish line acquisition system, comprising a sintering machine, a sintering trolley, a thermal imaging acquisition device and a processing device, wherein the sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail wheel; the thermal imaging acquisition device is arranged on the outside of the sintering machine tail wheel of the sintering machine, and the thermal imaging acquisition device is used to acquire the actual sintering cross-sectional thermal image of the current sintering trolley, and the thermal imaging acquisition device is used to acquire the historical effective sintering cross-sectional thermal image, and the actual sintering cross-sectional thermal image has a known correlation ratio with the real cross-sectional image of the current sintering trolley; the processing device is used to execute the steps of the above-mentioned method for partitioned sintering finish line acquisition.

[0017] The present invention has the following beneficial effects:

[0018] The method for obtaining the sintering finish line by partitioning provided by the present invention is based on the research on sintering technology. Since the sintering material temperature of the combustion zone when the trolley material completes sintering is basically determined, and the trolley material is completely sintered when it burns to the base material position; by obtaining the actual sintering cross-sectional thermal imaging of the current sintering trolley, the actual sintering cross-sectional thermal imaging has a thermal imaging base material layer and a horizontally arranged thermal imaging current sintering cross-sectional observation line, the actual sintering cross-sectional thermal imaging and the real cross-sectional image of the current sintering trolley have a known correlation ratio, the thermal imaging base material layer corresponds to the real base material layer of the real cross-sectional image, and the thermal imaging current sintering cross-sectional observation line corresponds to the current sintering cross-sectional observation line of the real cross-sectional image; by obtaining The current sintering cooling temperature value of each target observation temperature zone i on the current sintering cross-section observation line, the current sintering cross-section observation line is set close to the actual base material layer, and finally the sintering cooling horizontal distance corresponding to each target observation temperature zone i is calculated according to the critical sintering material temperature, the actual cooling rate corresponding to each target observation temperature zone i and the moving speed of the sintering trolley. Based on the sintering cooling horizontal distance corresponding to each sintering reference observation line i and the tail mark line of the sintering machine, the horizontal sintering end line Zi of each sintering reference observation line i (target observation temperature zone i) is obtained, which avoids the existing technical problem of only arranging temperature sensors in the sintering bellows, monitoring the bellows flue gas temperature through the temperature sensor, and then predicting the sintering end point.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is the process flow chart of the existing sintering system;

[0022] Figure 2 This is a schematic diagram of the existing sinter formation, where: Figure 2 a is the existing sinter formation process diagram, Figure 2 b is the existing sinter formation cross-section diagram, Figure 2 c is the completed cross-section of the existing sintered ore;

[0023] Figure 3 It is a partial structural diagram of the system for obtaining the sintering finish line by partitioning of the present invention;

[0024] Figure 4 This is a schematic diagram of thermal imaging of an actual sintering cross section of a method for obtaining a sintering finish line by partitioning in one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a real cross-sectional image of a method for obtaining a sintering finish line by partitioning in one embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a real cross-sectional image of a method for obtaining a sintering finish line by partitioning in another embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of a real cross-sectional image of a method for obtaining a sintering finish line by partitioning in yet another embodiment of the present invention;

[0028] Figure 8 1. This is a schematic diagram of thermal imaging of a historically effective sintering cross section of a method for obtaining a sintering finish line by partitioning in one embodiment of the present invention;

[0029] Figure 9 It is a schematic flow chart of the method for obtaining the sintering finish line by partitioning according to the present invention. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The sintering system mainly includes sintering trolley, mixer, main exhaust fan, ring cooler and other equipment. Figure 1 As shown, various raw materials are proportioned in the batching chamber to form a mixture. The mixture enters the mixer for mixing and pelletizing, and then is evenly distributed on the sintering trolley by a circular roller feeder and a nine-roller distributor to form a sintering mixture layer. The ignition fan and the ignition pilot fan start the ignition furnace, which ignites the sintering mixture on the top layer of the sintering trolley. The ignited combustion zone begins to move from top to bottom, and the mixture passing through the combustion zone is roasted into sintered ore. This is the sintering process. The sintered ore obtained after sintering is crushed by a single roller crusher and cooled in an annular cooler. Finally, it is screened and sized before being sent to the blast furnace or finished ore bin. The oxygen required for the sintering process is provided by the main exhaust fan. Multiple vertically arranged bellows are installed below the sintering trolley. Below the bellows is a horizontally mounted large flue (or flue). The large flue is connected to the main exhaust fan. The negative pressure air generated by the main exhaust fan through the flue and bellows passes through the trolley, providing combustion air for the sintering process.

[0035] Please refer to Figure 2 ( Figure 2 a. Figure 2 b and Figure 2 c) During the sintering process, the ignited combustion zone moves from top to bottom, and the moving speed of the combustion zone is the vertical sintering speed; the sintering trolley moves from the head to the tail (the tail of the sintering machine), and the moving speed of the sintering trolley is the sintering machine speed; when the combustion zone moves to the bottom of the sintering trolley mixture, the corresponding position of the sintering trolley relative to the sintering machine is the sintering end point. Figure 2 As shown in a, with the movement of the sintering trolley, the combustion zone gradually moves downward, and the mixture passing through the combustion zone is roasted into sintered ore; Figure 2As shown in b, during the sintering process, the materials in the sintering trolley can be divided into the bottom material layer, the mixed material layer, the combustion zone layer, and the sintered ore layer from bottom to top. Figure 2 As shown in Figure c, when the combustion zone moves to the bed material layer, the material in the sintering trolley has been completely roasted into sintered ore. The corresponding position at this point is the sintering end position, generally represented by the bellows number. Optionally, the combustion zone layer has a certain thickness, and the sintering end position can be understood as the point where the bottom of the combustion zone just contacts the bed material layer. When the sintering end position is controlled at the second-to-last bellows or the first-to-last bellows, no raw meal is produced, fuel utilization is high, and sintering efficiency is high.

[0036] Please refer to Figure 1 、 Figure 2 and Figure 3 Through the study of sintering technology, it is found that the sintered ore formation process is the process of gradual downward movement of the sintering combustion zone. The combustion temperature of the sintering combustion zone is 1250℃ (sintering material temperature). The sintering mixture is mixed with various components such as fuel, flux, iron ore, etc. After the sintering material surface is ignited at the ignition furnace at the head of the sintering machine, a combustion zone with a thickness of about 20 to 30 mm is formed. The various mixtures in the combustion zone are formed into sintered ore after high-temperature roasting. After the combustion zone gradually moves downward to the bottom of the sintering trolley to lay the bottom material layer, the combustion zone will no longer move downward, and the fuel in the area passed by the combustion zone has been burned. In the process of the combustion zone gradually moving downward, the sintering machine trolley also moves toward the tail mark line of the sintering machine. When the sintering machine trolley moves to the appropriate area at the tail of the sintering machine (the appropriate area for the sintering end point is the position of the penultimate bellows or the penultimate bellows), the combustion zone reaches the base material layer. At this time, the sintering area utilization rate is the highest, which is most beneficial to production. The main exhaust fan provides air for combustion in the combustion zone. The air passes through the sintering ore layer, the combustion zone, the mixture layer, and the base material layer of the trolley and is discharged through the bellows and the large flue. Obviously, the combustion zone heats the air passing through the combustion zone, and the heated air passes through the mixture layer under the combustion zone and is cooled by the mixture layer. As the combustion zone gradually moves downward, the flue gas temperature of each bellows will gradually rise. When the combustion zone reaches the base material layer, the flue gas temperature of the sintering bellows at the corresponding position reaches the highest. The base material layer is the end position of the combustion zone. After the combustion is completed, no heat is provided to the bellows flue gas, and the bellows flue gas temperature will gradually decrease thereafter.

[0037] When gas injection is used for zoned blowing sintering, the part above the fully sintered material layer (the material layer corresponding to the sintering material temperature or the material layer corresponding to the critical sintering material temperature) in the sintering cross-section thermal imaging is the sintering cooling material layer (cooling clinker layer), the material layer directly between the fully sintered material layer and the bottom material layer is the raw material layer, and the cooling sintering material layer above has undergone a sintering process before the trolley reaches the tail of the machine. At this time, according to the height difference and temperature difference between the fully sintered material layer and the sintering cooling material layer in the mapped real cross-sectional image and the known vertical combustion velocity, the actual cooling velocity corresponding to the target observation temperature zone i can be calculated. Specifically, if the temperature of the fully sintered material layer (combustion zone) in the real cross-sectional image is 1250°C, and a sintered cooling ore (cooled clinker layer) is formed in the area above the combustion zone, the temperature of the sintered cooling ore 20 mm above the fully sintered material is 1050°C; the point at 1050°C is cooled from 1250°C, and for a regional vertical combustion rate of 20 mm / min, the point at 1050°C was 1250°C one minute ago, that is, it cooled by 200°C in one minute. In the present invention, it is considered that the cooling time of the material layer after reaching 1250°C is consistent with the sintering time of the material layer from 1050°C to 1250°C.

[0038] Optionally, when the combustion zone reaches the bed layer, all the mixed materials on the trolley are roasted to form sintered ore. The coordinates of the point on the sintering machine axis corresponding to the combustion zone reaching the bed layer are the coordinates of the sintering end point. From a top-down perspective, the sintering machine is represented by a surface. For example, a sintering machine is 90 meters long and 5.5 meters wide, measuring 5500 mm x 90000 mm. A line connecting all points on this surface where the combustion zone reaches the bed layer represents the 1250°C isotherm on the bed layer. This line represents the horizontally estimated sintering end line in the actual sintering production process. The sintering end point is defined as a point on the line, representing the tail end of the line. For example, if a sintering machine has 23 bellows, each 4 meters wide, for a total length of 92 meters, the ideal location for the sintering end point is the position of the penultimate or second-to-last bellows. The existing method of determining the sintering endpoint by detecting the inflection point of the sintering bellows flue gas temperature directly limits the detection resolution to 4 meters. A more accurate endpoint can only be obtained indirectly through methods such as function fitting. Therefore, horizontally estimating the sintering endpoint is of great significance for understanding the sintering production process and guiding sintering production. The existing sintering endpoint is essentially an approximate and simplified concept of horizontally estimating the sintering endpoint within the scope of feasible technology, and only roughly determines the sintering endpoint based on the inflection point of the bellows flue gas temperature.

[0039] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 The present invention provides a method for obtaining a sintering end line by partitioning, comprising the following steps: S10, obtaining the actual sintering cross-section thermal imaging of the current sintering trolley, the actual sintering cross-section thermal imaging having a thermal imaging base material layer and a horizontally arranged thermal imaging proposed target observation line, the thermal imaging proposed target observation line being above the thermal imaging base material layer and having a thermal imaging vertical preset distance from the thermal imaging base material layer, the actual sintering cross-section thermal imaging and the real cross-section image of the current sintering trolley having a known correlation ratio, the thermal imaging base material layer corresponding to the real base material layer of the real cross-section image, the thermal imaging proposed target observation line corresponding to the current sintering cross-section observation line of the real cross-section image, the real base material layer and the current sintering cross-section observation line having a sintering reference distance corresponding to the thermal imaging vertical preset distance; S20, obtaining the current sintered ore temperature value Ti of each target observation temperature zone i on the current sintering cross-section observation line, the multiple target observation temperature zones i being evenly arranged along the extension direction of the current sintering cross-section observation line; S30, using the formula Calculate and obtain the sintering cooling horizontal distance corresponding to the target observation temperature zone i, where Tm is the critical sintering material temperature when the sintering state is completed, CRi is the actual cooling rate corresponding to the target observation temperature zone i, Sv is the current moving speed of the sintering trolley, and Li is the sintering cooling horizontal distance; S40, obtain the horizontal estimated sintering end line Zi for each target observation temperature zone i based on the sintering cooling horizontal distance corresponding to each target observation temperature zone i and the sintering machine tail mark line.

[0040] The method for obtaining the sintering finish line by partitioning provided by the present invention is based on the research on sintering technology. Since the sintering material temperature of the combustion zone when the trolley material completes sintering is basically determined, and the trolley material is completely sintered when it burns to the base material position; by obtaining the actual sintering cross-sectional thermal imaging of the current sintering trolley, the actual sintering cross-sectional thermal imaging has a thermal imaging base material layer and a horizontally arranged thermal imaging current sintering cross-sectional observation line, the actual sintering cross-sectional thermal imaging and the real cross-sectional image of the current sintering trolley have a known correlation ratio, the thermal imaging base material layer corresponds to the real base material layer of the real cross-sectional image, and the thermal imaging current sintering cross-sectional observation line corresponds to the current sintering cross-sectional observation line of the real cross-sectional image; by obtaining The current sintering cooling temperature value of each target observation temperature zone i on the current sintering cross-section observation line, the current sintering cross-section observation line is set close to the actual base material layer, and finally the sintering cooling horizontal distance corresponding to each target observation temperature zone i is calculated according to the critical sintering material temperature, the actual cooling rate corresponding to each target observation temperature zone i and the moving speed of the sintering trolley. Based on the sintering cooling horizontal distance corresponding to each sintering reference observation line i and the tail mark line of the sintering machine, the horizontal sintering end line Zi of each sintering reference observation line i (target observation temperature zone i) is obtained, which avoids the existing technical problem of only arranging temperature sensors in the sintering bellows, monitoring the bellows flue gas temperature through the temperature sensor, and then predicting the sintering end point.

[0041] It can be understood that the thermal imaging base material layer maps the space layer occupied by the actual base material on the bottom surface of the current sintering trolley, and the thermal imaging vertical preset distance maps the sintering reference distance of the real cross-sectional image; the sintering cooling horizontal distance Li is used to map the sintering reference observation line i and the sintering machine tail mark line. Based on the sintering cooling horizontal distance, the sintering end point corresponding to each target observation temperature zone i can be determined.

[0042] It can be understood that the sintering material temperature Tm when the sintering is completed is 1230° C. to 1270° C. In the present invention, the sintering material temperature Tm when the sintering is completed is set to 1250° C.

[0043] Please refer to Figure 6Furthermore, in order to accurately obtain the actual cooling rate of each target observation temperature zone i, the actual sintering section thermal imaging has a thermal imaging comparison target observation line parallel to the thermal imaging proposed target observation line, the thermal imaging comparison target observation line is above the thermal imaging proposed target observation line, the thermal imaging comparison target observation line corresponds to the temperature difference comparison observation line of the real cross-section image, and the temperature difference comparison observation line has a vertical height difference with the current sintering cross-section observation line; the current comparison temperature value of each target observation temperature zone i on the temperature difference comparison observation line is obtained; the single-zone cooling temperature difference of the same target observation temperature zone i is obtained according to the difference between the current sintered ore temperature value Ti and the current comparison temperature value of each target observation temperature zone i; the vertical height difference between the temperature difference comparison observation line and the current sintering cross-section observation line is obtained; the single-zone cooling time is obtained according to the vertical height difference and the vertical combustion speed; the actual cooling rate CRi corresponding to each target observation temperature zone i is obtained according to the single-zone cooling time and the single-zone cooling temperature difference. Specifically, the cooling time of a single zone = vertical height difference / vertical combustion speed; the vertical combustion speed can be determined based on experience or based on the total combustion mileage and total combustion time.

[0044] Please refer to Figure 7 Furthermore, in order to accurately obtain the actual cooling rate of each target observation temperature zone i, the actual sintering cross-section thermal imaging has a thermal imaging isothermal observation line, which is above the proposed target observation line of the thermal imaging, and the thermal imaging isothermal observation line corresponds to the isothermal combustion line of the real cross-section image; the isothermal combustion line of each target observation temperature zone i is fitted to obtain a combustion isothermal horizontal line, and the combustion isothermal horizontal line of each target observation temperature zone i is arranged parallel to the current sintering cross-section observation line; the current comparative temperature value of the combustion isothermal horizontal line of each target observation temperature zone i is obtained; the interval cooling temperature difference of the same target observation temperature zone i is obtained according to the difference between the current sintered ore temperature value Ti and the current comparative temperature value of each target observation temperature zone i; the vertical height difference between the temperature difference comparison observation line of each target observation temperature zone i and the current sintering cross-section observation line is obtained; the interval cooling time is obtained according to the vertical height difference and the vertical combustion speed; the actual cooling rate CRi corresponding to each target observation temperature zone i is obtained according to the interval cooling time and the interval cooling temperature difference. Specifically, interval cooling time = vertical height difference / vertical burning speed; the vertical burning speed can be determined based on experience or based on the total burning mileage and total burning time.

[0045] Please refer to Figure 4 、 Figure 5 and Figure 9 , further, using the formula Calculate the actual cooling rate for each target observation temperature zone i. T'm is the material temperature corresponding to the historical critical sintering layer in the historical effective sintering cross-section thermal imaging, T'′i is the material temperature of the historical sintering cooling layer corresponding to the target observation temperature zone i in the historical effective sintering cross-section thermal imaging, Agv is the vertical combustion velocity, the material temperature range corresponding to the historical critical sintering layer is [1230°C, 1270°C], and the material temperature range of the historical sintering cooling layer is [600°C, 1200°C]. The actual cooling rate for each target observation temperature zone i is calculated based on the historical effective sintering cross-section thermal imaging.

[0046] Optionally, the tail mark line of the sintering machine is arranged close to the tail wheel of the sintering machine and parallel to the axis of the tail wheel of the sintering machine (that is, parallel to the sintering section of the trolley). In the present invention, based on the target observation temperature zone i on the actual sintering section thermal imaging, the horizontal estimated sintering end line corresponding to each target observation temperature zone i is mapped and obtained, and finally the horizontal estimated sintering end line can be obtained (that is, the isothermal line of the sintering material temperature is estimated); wherein, the horizontal estimated sintering end line corresponding to the target observation temperature zone i can be determined by the sintering cooling horizontal distance Li between the horizontal estimated sintering end line Zi corresponding to the target observation temperature zone i and the tail mark line of the sintering machine. When guiding sintering, if the sintering cooling horizontal distance Li is too large, it means that the horizontally calculated sintering end line Zi is too advanced, and the distance between the horizontally calculated sintering end line Zi and the target sintering end bellows is advanced. At this time, the heat utilization rate is low, and the sintering speed can be slowed down to make the sintering close to the target sintering end bellows; if the sintering cooling horizontal distance Li is too small, it means that the horizontally calculated sintering end line Zi is too lagging, and the distance between the horizontally calculated sintering end line Zi and the target sintering end bellows is relatively lagging. At this time, raw materials may be easily produced. The sintering speed can be accelerated to get close to the target sintering end bellows, and the horizontally calculated sintering end line Zi can be adjusted by gas injection.

[0047] In specific implementation, each target observation temperature zone i corresponds to a gas blowing pipe, and the gas blowing pipe is arranged in the gas blowing area. Multiple gas blowing pipes are evenly spaced along the width of the vehicle. Each gas blowing pipe is provided with a gas regulating valve for regulating the flow rate. Each target observation temperature zone corresponds to at least one sintering reference observation line i. If the horizontally estimated sintering end line Zi is too early, the gas blowing amount of the corresponding gas blowing pipe is reduced. If the horizontally estimated sintering end line Zi is too late, the gas blowing amount of the corresponding gas blowing pipe is increased.

[0048] It is understood that the more target observation temperature zones are set, the more horizontal estimated sintering end lines can be obtained, which in turn helps improve the accuracy of obtaining the horizontal estimated sintering end line. Optionally, the number of target observation temperature zones is not less than 3. In the present invention, the number of target observation temperature zones can be 3, 5, 10, 20, etc. More preferably, all target observation temperature zones on the current sintering cross-section observation line are obtained, and after obtaining the sintering cooling horizontal distances corresponding to all target observation temperature zones, the horizontal estimated sintering end line is obtained by fitting.

[0049] Furthermore, in order to obtain the horizontal estimated sintering end line to guide sintering, the horizontal estimated sintering end line corresponding to each target observation temperature zone i is determined according to the sintering cooling horizontal distance Li, and all the horizontal estimated sintering end lines are linearly fitted to obtain the horizontal estimated sintering end line.

[0050] It can be understood that in the present invention, according to actual conditions, the temperature range of the terminal sintering line temperature is [1230°C, 1270°C], the temperature range of the historical sintering line temperature is [600°C, 1200°C], and the complete sintering layer cooling is when the ore is sintered and cooled to 600°C-1200°C, and the cooling rate is relatively stable.

[0051] It can be understood that the present invention fully considers the characteristics of the sintering process, considers the different characteristics of the sintering material in the middle area and the sintering material on both sides during the sintering process of the sintering trolley, and obtains the current actual sintering distance between the horizontal estimated sintering end line Zi and the tail mark line of the sintering machine corresponding to the corresponding target observation temperature zone i based on the actual cooling rate corresponding to each target observation temperature zone i.

[0052] Furthermore, in order to accurately determine the sintering endpoint, a plurality of target observation temperature zones i are evenly arranged along the extension direction of the current sintering cross-section observation line.

[0053] It is understood that the thickness of the combustion zone is 20 to 30 mm. To accurately determine the sintering endpoint, the vertical distance between the current sintering cross-section observation line and the actual bed material layer should not exceed 30 mm. In a preferred embodiment of the present invention, the vertical distance between the current sintering cross-section observation line and the actual bed material layer is 5 mm.

[0054] It can be understood that the material at the current sintering section observation line position adjacent to the base material layer and above the base material layer may be raw material (the temperature of raw material is generally low, and the material temperature is generally below 600°C), or it may be the burning clinker that has just been sintered (completely sintered material layer, the material temperature is between 1230°C and 1270°C), or it may be the cooled clinker after sintering (sintered cooling material layer, the material temperature is generally between 600°C and 1230°C).

[0055] Furthermore, if the current temperature interval value of the current sintered ore temperature value Ti is less than the preset ignition temperature threshold, a prompt message is issued. Optionally, the preset ignition temperature threshold can be pre-set. In order to avoid ignition failure or other reasons that cause raw materials to be difficult to detect, the preset ignition temperature threshold is 600°C.

[0056] It is understandable that a sensor is installed at the tail mark position of the sintering machine to track the trolley inclination angle A. When the trolley inclination angle A is reached, the thermal imaging camera takes a picture of the tail section of the sintering machine to obtain the actual sintering cross-section thermal image. The actual sintering cross-section thermal image has a known correlation ratio with the real cross-sectional image of the current sintering trolley. It is understandable that as the sintering trolley moves, the combustion zone gradually moves downward, and the mixture passed by the combustion zone is roasted into sintered ore; when the current sintering trolley moves to the tail of the sintering machine (the target sintering end position), the combustion zone has reached the bottom material layer of the sintering machine trolley; during the sintering production process, air continues to pass through the mixture layer to provide air for the combustion zone, and the air will also cool the sintered ore area above the combustion zone that has been formed.

[0057] It can be understood that in the present invention, the position of the base material layer in the actual sintering cross-section thermal imaging can be determined by the ratio of the actual space occupied by the base material to the actual space of the target batch sintering trolley.

[0058] Furthermore, multiple frames of historical sintering cross-sectional thermal imaging consistent with the current working conditions of the current sintering trolley are obtained; the historical sintering cross-sectional thermal imaging of each target observation temperature zone i having a historical critical sintering material layer and a historical sintering cooling material layer is determined as a historical reference sintering cross-sectional thermal imaging; the adjacent temperature difference of the historical sintering cooling material layer of the adjacent target observation temperature zone i in each historical reference sintering cross-sectional thermal imaging is obtained; the historical reference sintering cross-sectional thermal imaging with the adjacent temperature difference within the preset temperature difference range is determined as a historical effective sintering cross-sectional thermal imaging. It is understandable that in the present invention, by obtaining a suitable image as a historical effective sintering cross-sectional thermal imaging from multiple frames of historical sintering cross-sectional thermal imaging, the actual cooling rate corresponding to each target observation temperature zone i is finally obtained. It is understandable that the preset temperature difference range can be 5 to 50°C; it can also be 5 to 100°C; it can also be 5 to 150°C.

[0059] Furthermore, in order to improve the accuracy of obtaining the actual cooling rate, the preset temperature difference range is 5 to 50°C.

[0060] The present invention also provides a partitioned sintering finish line acquisition system, comprising a sintering machine, a sintering trolley, a thermal imaging acquisition device and a processing device, wherein the sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail wheel; the thermal imaging acquisition device is arranged on the outside of the sintering machine tail wheel of the sintering machine, the thermal imaging acquisition device is used to acquire the actual sintering cross-sectional thermal image of the current sintering trolley, and the thermal imaging acquisition device is used to acquire the historical effective sintering cross-sectional thermal image, and the actual sintering cross-sectional thermal image has a known correlation ratio with the real cross-sectional image of the current sintering trolley; the processing device is used to execute the steps of the above-mentioned method for partitioned sintering finish line acquisition.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for obtaining a sintering finish line by partitioning, characterized in that: The steps include: S10, obtaining an actual sintering cross-sectional thermal image of the current sintering trolley, wherein the actual sintering cross-sectional thermal image has a thermal imaging base material layer and a horizontally arranged thermal imaging proposed target observation line, the thermal imaging proposed target observation line is above the thermal imaging base material layer and has a thermal imaging preset vertical distance from the thermal imaging base material layer, the actual sintering cross-sectional thermal image and the real cross-sectional image of the current sintering trolley have a known correlation ratio, the thermal imaging base material layer corresponds to the real base material layer of the real cross-sectional image, the thermal imaging proposed target observation line corresponds to the current sintering cross-sectional observation line of the real cross-sectional image, and the real base material layer and the current sintering cross-sectional observation line have a sintering reference distance corresponding to the thermal imaging preset vertical distance; S20, obtaining each target observation temperature zone on the current sintering cross-section observation line Current sinter temperature value i, multiple target observation temperature zones Evenly arranged along the extension direction of the current sintering cross-section observation line; S30, using the formula Calculate and obtain the target observation temperature zone The corresponding sintering cooling horizontal distance, where is the critical sintering material temperature when the sintering state is completed, The target observation temperature zone The corresponding actual cooling rate is is the moving speed of the sintering trolley, is the sintering cooling horizontal distance; S40, according to each of the target observation temperature zones The corresponding sintering cooling horizontal distance and sintering machine tail line obtain each target observation temperature zone Horizontal estimation of sintering end line .

2. The method for obtaining the sintering finish line by partitioning according to claim 1, characterized in that: The actual sintered cross-section thermal imaging has a thermal imaging comparison target observation line that is parallel to the proposed thermal imaging target observation line, the thermal imaging comparison target observation line is above the proposed thermal imaging target observation line, the thermal imaging comparison target observation line corresponds to the temperature difference comparison observation line of the real cross-section image, and the temperature difference comparison observation line has a vertical height difference with the current sintered cross-section observation line; Obtain each target observation temperature zone on the temperature difference comparison observation line The current comparison temperature value; According to each of the target observation temperature zones Current sinter temperature value The difference between i and the current comparison temperature value obtains the same target observation temperature zone The single zone cooling temperature difference; Obtaining a vertical height difference between the temperature difference comparison observation line and the current sintering cross-section observation line; The cooling time of a single zone is obtained based on the vertical height difference and the vertical burning velocity; Obtain each target observation temperature zone according to the single zone cooling time and the single zone cooling temperature difference The corresponding actual cooling rate .

3. The method for obtaining the sintering finish line by partitioning according to claim 1, characterized in that: The actual sintered cross-section thermal imaging has a thermal imaging comparison target observation line that is parallel to the proposed thermal imaging target observation line, the thermal imaging comparison target observation line is above the proposed thermal imaging target observation line, the thermal imaging comparison target observation line corresponds to the temperature difference comparison observation line of the real cross-section image, and the temperature difference comparison observation line has a vertical height difference with the current sintered cross-section observation line; The actual sintered cross-section thermal imaging has a thermal imaging isothermal observation line, which is located above the proposed target observation line of the thermal imaging, and corresponds to the isothermal combustion line of the real cross-section image; Each of the target observation temperature zones The isothermal combustion line is fitted to obtain the combustion isothermal horizontal line, and each of the target observation temperature zones The combustion isothermal horizontal line is arranged in parallel with the current sintering cross-section observation line; Get each target observation temperature zone The current comparative temperature value of the combustion isotherm level; According to each of the target observation temperature zones Current sinter temperature value The difference between i and the current comparison temperature value obtains the same target observation temperature zone The interval cooling temperature difference; Get each target observation temperature zone The vertical height difference between the temperature difference comparison observation line and the current sintering section observation line; Obtain interval cooling time based on vertical height difference and vertical burning speed; Obtain each target observation temperature zone according to the interval cooling time and the interval cooling temperature difference The corresponding actual cooling rate .

4. The method for obtaining the sintering finish line by partitioning according to claim 1, characterized in that: Using the formula Calculate and obtain each target observation temperature zone ; is the material temperature corresponding to the historical critical sintering material layer in the historical effective sintering cross-section thermal imaging, The target observation temperature zone in the historical effective sintering cross-section thermal imaging The corresponding historical sintering cooling material layer temperature, is the vertical combustion velocity, the material temperature range corresponding to the historical critical sintering material layer is [1230°C, 1270°C], and the material temperature range of the historical sintering cooling material layer is [600°C, 1200°C].

5. The method for obtaining a sintering finish line by partitioning according to any one of claims 1 to 4, characterized in that: According to the sintering cooling horizontal distance Determine each target observation temperature zone Corresponding horizontal calculation of sintering end line , All the above levels will be calculated as the final sintering line Perform linear fitting to obtain the horizontal estimated sintering end line.

6. The method for obtaining a sintering finish line by partitioning according to any one of claims 1 to 4, characterized in that: Also includes the steps: The vertical distance between the current sintering cross-section observation line and the actual base material layer is no more than 30 mm.

7. The method for obtaining a sintering finish line by partitioning according to any one of claims 1 to 4, characterized in that: If the current sintering temperature value If the current temperature range value of i is lower than the preset ignition temperature threshold, a prompt message will be issued.

8. The method for obtaining the sintering finish line by partitioning according to claim 4, characterized in that: Acquire multiple frames of historical sintering cross-section thermal images consistent with the current working condition of the current sintering trolley; Determine each target observation temperature zone The historical sintering cross-section thermal images all having the historical critical sintering material layer and the historical sintering cooling material layer are historical reference sintering cross-section thermal images; Obtain the target observation temperature zone adjacent to each of the historical reference sintering cross-section thermal images The temperature difference of adjacent areas of the historical sintering cooling material layer; The historical reference sintering cross-section thermal image with the adjacent area temperature difference within a preset temperature difference range is determined as the historical effective sintering cross-section thermal image.

9. The method for obtaining the sintering finish line by partitioning according to claim 8, characterized in that: The preset temperature difference range is 5 to 50°C.

10. A system for obtaining a sintering finish line by partitioning, characterized in that: It includes a sintering machine, a sintering trolley, a thermal imaging acquisition device and a processing device, wherein the sintering trolley is movably arranged along the head wheel of the sintering machine toward the tail wheel of the sintering machine; The thermal imaging acquisition device is provided on the outer side of the sintering machine tail wheel of the sintering machine, and is used to acquire the actual sintering cross-section thermal image of the current sintering trolley, and is used to acquire the historical effective sintering cross-section thermal image, and the actual sintering cross-section thermal image has a known correlation ratio with the real cross-section image of the current sintering trolley; The processing device is used to execute the steps of the method for obtaining a sintering finish line by partitioning as claimed in any one of claims 1 to 8.

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