Method and system for obtaining sintering finishing line on line

Abstract

The invention discloses a method and system for obtaining a sintering finish line on line, and the method comprises the steps: obtaining an effective actual sintering section thermal image of a target batch trolley, and the effective actual sintering section thermal image is provided with a thermal imaging bedding material layer and a thermal imaging target observation line which is horizontally arranged; the effective actual sintering section thermal image and the real section image of the target batch trolley have a known correlation ratio; the current sintering ore temperature value of each sintering reference observation point on the current sintering section observation line is obtained; calculating a sintering cooling horizontal distance corresponding to the sintering reference observation point; and obtaining a horizontal calculation sintering end point of each sintering reference observation point according to the sintering cooling horizontal distance corresponding to each sintering reference observation point and the sintering machine tail marking line. According to the method for obtaining the sintering terminal line on line, the technical problem that only a temperature sensor can be arranged in a sintering air bellow in the prior art, and the temperature sensor is used for monitoring the flue gas temperature of the air bellow so as to predict the sintering terminal point is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering, and in particular to a method for obtaining a sintering endpoint line online and an online sintering endpoint detection system. Background Art

[0002] With the rapid development of modern industry, the scale of steel production is getting larger and larger, and energy consumption is also increasing. Energy conservation and environmental protection indicators are becoming more and more important factors to consider in the steel production process. In steel production, iron-containing raw ore needs to be processed by the sintering system before entering the blast furnace for smelting. That is, various powdered iron-containing raw materials are mixed with appropriate amounts of fuel (coal powder, coke powder) and flux, and appropriate amounts of water. After mixing and balling, they are placed on the sintering trolley for roasting, so that a series of physical and chemical changes occur, forming sintered ore that is easy to smelt. This process is called sintering.

[0003] At present, the sintering end point is detected by detecting the flue gas temperature of the sintering bellows, and then the working condition of the sintering system is adjusted based on the detected sintering end point, so as to keep the sintering end point at the second to last or third to last bellows as much as possible to ensure the working efficiency of the sintering system (if the sintering end point is too early, the sintering system cannot be fully utilized, and the sintering efficiency is low; if the sintering end point is too late, the sintering material cannot be sintered, and there is raw material at the bottom of the sintering trolley, and the raw material needs to be re-sintered, and the sintering efficiency is low). In the prior art, the sintering bellows are large in size (about 2500mm X 4000mm), and the width of each sintering bellows is 4 meters in the direction of the sintering machine. Therefore, the existing method of directly detecting the sintering end point position by detecting the inflection point of the sintering bellows flue gas temperature is 4 meters, and a temperature sensor needs to be arranged in each bellows, which has a complex structure and many inspection and maintenance procedures. The higher-precision end point position can only be indirectly obtained 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 defects. Summary of the invention

[0005] The present invention provides a method and system for online acquisition of a sintering end point line, which solves the existing technical problem that the sintering end point can only be predicted by monitoring the wind box flue gas temperature through a temperature sensor.

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

[0007] A method for obtaining a sintering end line online comprises the following steps: S10, obtaining an effective actual sintering cross-section thermal imaging of a target batch trolley, the effective actual sintering cross-section thermal imaging having a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, the thermal imaging target observation line being above the thermal imaging base material layer and having a thermal imaging vertical preset distance with the base material layer, the base material layer being a space layer occupied by the actual base material on the bottom surface of the target batch trolley, the effective actual sintering cross-section thermal imaging having a known correlation ratio with a real cross-section image of the target batch trolley, the thermal imaging base material layer corresponding to the real base material layer of the real cross-section image, the thermal imaging target observation line corresponding to the current sintering cross-section observation line of the real cross-section image, the real base material layer having a sintering reference distance with the current sintering cross-section observation line corresponding to the thermal imaging vertical preset distance; S20, obtaining a current sintering ore temperature value Ti of each sintering reference observation point i on the current sintering cross-section observation line, the plurality of sintering reference observation points i being arranged at intervals 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 sintering reference observation point i, wherein Tm is the sintering material temperature when the sintering is completed, CR is the preset cooling speed, Sv is the moving speed of the sintering trolley, and Li is the sintering cooling horizontal distance corresponding to the sintering reference observation point i; S40, according to the sintering cooling horizontal distance corresponding to each sintering reference observation point i and the tail mark line of the sintering machine, obtain the horizontal estimated sintering end point Zi of each sintering reference observation point i.

[0008] Furthermore, the method also includes the step of performing linear fitting on all horizontal estimated sintering end points Zi to obtain the horizontal estimated sintering end line.

[0009] Furthermore, the sintering reference distance is no greater than 30 mm.

[0010] Furthermore, the method further includes the steps of: obtaining a current temperature interval value of the thermal imaging target observation line, and issuing a prompt message if the current temperature interval value of the target observation line is less than a preset ignition temperature threshold.

[0011] Furthermore, the number of sintering reference observation points i is not less than 3.

[0012] Furthermore, the preset cooling rate is 90° C. / min to 110° C. / min.

[0013] Furthermore, the initial actual sintering cross-sectional thermal imaging image of each target sintering trolley corresponding to the target batch trolley is obtained; the distorted initial actual sintering cross-sectional thermal imaging image is filtered out; the initial actual sintering cross-sectional thermal imaging image after the distortion is filtered out is processed to isolate and filter the area with a material layer thickness of more than 1 / 3 of the initial actual sintering cross-sectional thermal imaging image; the initial actual sintering cross-sectional thermal imaging image after image processing is overlapped and averaged for secondary processing to obtain the effective actual sintering cross-sectional thermal imaging of the target batch trolley.

[0014] The present invention also provides an online 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 outer side of the sintering machine tail wheel of the sintering machine, and the thermal imaging acquisition device is used to obtain the effective actual sintering cross-section thermal image of the target batch trolley; the processing device is used to execute the steps of the above-mentioned method for online sintering finish line acquisition.

[0015] The present invention has the following beneficial effects:

[0016] The method for online acquisition of the sintering finish line 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 acquiring the effective actual sintering cross-sectional thermal imaging of the target batch trolley at the tail mark line position of the sintering machine, the effective actual sintering cross-sectional thermal imaging has a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, the effective actual sintering cross-sectional thermal imaging has a known correlation ratio with the real cross-sectional image of the target batch trolley, and the thermal imaging base material layer corresponds to the real base material layer of the real cross-sectional image , the thermal imaging target observation line corresponds to the current sintering cross-section observation line of the real cross-section image; the current sintered ore temperature value of each sintering reference observation point on the current sintering cross-section observation line is used, and finally the sintering cooling horizontal distance is calculated according to the sintering material temperature, the preset cooling speed and the moving speed of the sintering trolley. Based on the sintering cooling horizontal distance corresponding to each sintering reference observation point i and the sintering machine tail mark line, the horizontal estimated sintering end point Zi of each sintering reference observation point 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.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is the process flow chart of the existing sintering system;

[0020] 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;

[0021] Figure 3 It is a partial structural schematic diagram of a system for obtaining a sintering finish line during sintering of the present invention;

[0022] Figure 4 It is a schematic diagram of thermal imaging of an actual effective tail sintering section for online acquisition of a sintering finish line in one embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of obtaining a real cross-sectional image of a sintering finish line online in one embodiment of the present invention;

[0024] Figure 6 It is a flow chart of an embodiment of the method for obtaining the sintering finish line online of the present invention. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot 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" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The sintering system mainly includes sintering trolley, mixer, main exhaust fan, ring cooler and other equipment. Figure 1 As shown in the figure: various raw materials are proportioned in the batching room to form a mixture. After the mixture enters the mixer for mixing and balling, it is evenly spread on the sintering trolley through the round roller feeder and the nine-roller distributor to form a sintering mixture layer. The ignition fan and the ignition fan start the ignition furnace, and the sintering mixture on the top layer of the sintering trolley is ignited in the ignition furnace. 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 then cooled in an annular cooler. Finally, it is sent to the blast furnace or the finished ore bin after screening and granulation. Among them, the oxygen required for the sintering process is provided by the main exhaust fan. There are multiple vertically arranged bellows under the sintering trolley. Under the bellows is a horizontally placed large flue (or flue). The large flue is connected to the main exhaust fan. The negative pressure wind generated by the main exhaust fan through the large flue and the bellows passes through the trolley to provide combustion-supporting air for the sintering process.

[0030] 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 mixed material passing through the combustion zone is roasted into sintered ore; Figure 2 As shown in b, during the sintering process, the materials in the sintering trolley can be divided into a bottom material layer, a mixed material layer, a combustion zone layer, and a sintered ore layer from bottom to top. Figure 2As shown in c, when the combustion zone moves to the bed material layer, the materials in the sintering trolley have all been roasted into sintered ore. At this time, the corresponding position is the sintering end position, which is 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 bottom of the combustion zone just touching 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 material will be produced, the fuel utilization rate is high, and the sintering efficiency is high.

[0031] Please refer to Figure 1 , Figure 2 and Figure 3 Through the study of sintering technology, it is found that the sintering ore formation process is the process of the sintering combustion zone gradually moving downward. 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 30mm is formed. Various mixtures in the combustion zone are formed after high-temperature roasting to form sintered ore. 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 direction of the sintering machine tail mark line. When the sintering machine trolley moves to the appropriate area at the tail of the sintering machine (the appropriate area of ​​the sintering end point is the position of the penultimate bellows or the penultimate bellows), the combustion zone reaches the bottom material layer. At this time, the sintering area utilization rate is the largest, which is most beneficial to production; the main exhaust fan provides air for the combustion of the combustion zone, and the air passes through the trolley sintering ore layer, the combustion zone, the mixed material layer, and the bottom material layer, 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 mixed material layer under the combustion zone and is cooled by the mixed material layer. As the combustion zone gradually moves downward, the flue gas temperature of each bellows will gradually rise. When the combustion zone reaches the bottom material layer, the flue gas temperature of the sintering bellows at the corresponding position reaches the highest; the bottom 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.

[0032] Optionally, when the combustion zone reaches the bed material layer, all the mixed materials on the trolley are roasted to form sintered ore. When the combustion zone reaches the bed material layer, the coordinates of the corresponding points on the sintering machine axis are the coordinates of the sintering end point. Looking at the sintering machine from a bird's eye view, sintering is a surface. For example, a sintering machine is 90 meters long and 5.5 meters wide. The sintering machine is a surface of 5500mm X 90000mm. Connecting all the points of the combustion zone on this surface that reach the bed material layer into a line is the isotherm of 1250℃ on the bed material layer. This line is the horizontally estimated sintering end line in the actual sintering production process. The sintering end point is to regard the sintering machine as a straight line. The sintering end point is a point on the straight line of the sintering machine. The position of the sintering end point is located at the tail of the straight line of the sintering machine. For example, a sintering machine has 23 bellows in length, each bellows is 4 meters wide, and the total length is 92 meters. The reasonable position of the sintering end point is the position of the penultimate bellows or the penultimate bellows. The existing method of directly detecting the sintering end point by detecting the temperature inflection point of the sintering bellows flue gas has a resolution of 4 meters, and the end point with higher precision can only be obtained indirectly through function fitting and other methods. It can be seen that the acquisition of the horizontal calculation of the sintering end line is of great significance for mastering the sintering production process and guiding sintering production. The existing sintering end point is essentially a concept of approximate simplification of the horizontal calculation of the sintering end line from the perspective of feasible technology, and the sintering end point is only roughly obtained through the temperature inflection point of the bellows flue gas.

[0033] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The present invention provides a method for obtaining a sintering end line online, comprising the following steps: S10, obtaining an effective actual sintering cross-section thermal imaging of a target batch trolley, wherein the effective actual sintering cross-section thermal imaging has a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, wherein the thermal imaging target observation line is located above the thermal imaging base material layer and has a thermal imaging vertical preset distance with the thermal imaging base material layer, wherein the thermal imaging base material layer is a space layer occupied by the actual base material on the bottom surface of the target batch trolley, and the effective actual sintering cross-section thermal imaging is consistent with the target batch trolley. The real cross-sectional image of the vehicle has 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 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 vertical preset distance of the thermal imaging; S20, obtaining the current sintering ore temperature value Ti of each sintering reference observation point i on the current sintering cross-sectional observation line, and multiple sintering reference observation points i are arranged at intervals along the extension direction of the current sintering cross-sectional observation line; S30, using the formula Calculate and obtain the sintering cooling horizontal distance corresponding to the sintering reference observation point i, wherein Tm is the sintering material temperature when the sintering is completed, CR is the preset cooling speed, Sv is the moving speed of the sintering trolley, and Li is the sintering cooling horizontal distance corresponding to the sintering reference observation point i; S40, according to the sintering cooling horizontal distance corresponding to each sintering reference observation point i and the tail mark line of the sintering machine, obtain the horizontal estimated sintering end point Zi of each sintering reference observation point i.

[0034] The method for online acquisition of the sintering finish line 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 effective actual sintering cross-sectional thermal imaging of the target batch trolley at the tail mark line position of the sintering machine, the effective actual sintering cross-sectional thermal imaging has a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, the effective actual sintering cross-sectional thermal imaging has a known correlation ratio with the real cross-sectional image of the target batch trolley, the thermal imaging base material layer corresponds to the real base material layer of the real cross-sectional image, and the thermal imaging target observation line is The current sintering section observation line should be the real cross-sectional image; through the current sintered ore temperature value of each sintering reference observation point on the current sintering section observation line, the current sintering section observation line is set close to the real bottom material layer, and finally the sintering cooling horizontal distance is calculated according to the sintering material temperature, the preset cooling speed and the moving speed of the sintering trolley. Based on the sintering cooling horizontal distance corresponding to each sintering reference observation point i and the sintering machine tail mark line, the horizontal estimated sintering end point Zi of each sintering reference observation point 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.

[0035] 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 target batch trolley, and the thermal imaging vertical preset distance maps the sintering reference distance of the real cross-sectional image; the current sintering distance between the sintering reference observation point i and the tail mark line of the sintering machine is mapped through the sintering cooling horizontal distance Li, and the sintering end point corresponding to each sintering reference observation point i can be determined based on the current sintering distance.

[0036] It can be understood that the sintering material temperature Tm when the sintering state is completed is 1230℃ to 1280℃; the preset cooling rate is 90℃ / min to 110℃ / min, and the preset cooling rate is determined according to the actual working conditions of the sintering system, which can be 100℃ / min, 90℃ / min, 110℃ / min and other cooling rates. Optionally, the tail mark line of the sintering machine is arranged close to the tail wheel of the sintering machine and is parallel to the axial direction of the tail wheel of the sintering machine (that is, parallel to the sintering section of the trolley). In the present invention, the horizontal estimated sintering end point corresponding to each sintering reference observation point i is mapped based on the thermal imaging target observation line on the thermal imaging of the effective actual sintering section, and finally the horizontal estimated sintering end line (that is, the isotherm of the sintering material temperature is estimated) can be obtained; wherein, the horizontal estimated sintering end point corresponding to the sintering reference observation point i can be determined by the distance between the tail mark line of the sintering machine (the distance value between the tail mark line of the sintering machine and the penultimate bellows is known data) and the sintering cooling horizontal distance Li. When guiding sintering, if the current sintering cooling horizontal distance Li is too large, it means that the horizontally estimated sintering endpoint Zi is too advanced (the horizontally estimated sintering endpoint Zi is calculated to be before the third-to-last bellows), and the distance of the horizontally estimated sintering endpoint Zi relative to the target sintering endpoint 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 endpoint bellows; if the current sintering cooling horizontal distance Li is too small, it means that the horizontally estimated sintering endpoint Zi is too delayed (the horizontally estimated sintering endpoint Zi is calculated to be after the first-to-last bellows), and the distance of the horizontally estimated sintering endpoint Zi relative to the target sintering endpoint bellows is relatively delayed. At this time, raw materials may easily appear, and the sintering speed can be accelerated to get close to the target sintering endpoint bellows, and finally the horizontally estimated sintering endpoint Zi can be adjusted by gas injection.

[0037] In the specific implementation, the actual sintering cross-section thermal imaging is evenly divided into n target observation temperature zones along the vehicle width direction, where n is a positive integer greater than 1, and each target observation temperature zone i corresponds to a gas blowing pipe, which is arranged in the gas blowing area. Multiple gas blowing pipes are evenly spaced along the vehicle width direction, and 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 point i. If the horizontally estimated sintering end point Zi is too early, the gas blowing amount of the corresponding gas blowing pipe is reduced. If the horizontally estimated sintering end point Zi is too late, the gas blowing amount of the corresponding gas blowing pipe is increased.

[0038] It can be understood that the target batch trolley can be a current sintering trolley or multiple historical sintering trolleys.

[0039] It can be understood that the more sintering reference observation points i are set, the more horizontal estimated sintering end points Zi are obtained, which is beneficial to improve the accuracy of obtaining the horizontal estimated sintering end line. In the present invention, the number of sintering reference observation points i can be 3, 5, or 10, 20, etc. More preferably, the number of sintering reference observation points i is 20, and the number of target observation temperature zones is 5. Each target observation temperature zone is regulated by the horizontal estimated sintering end points Zi mapped by 4 sintering reference observation points i, which is beneficial to improve the accuracy of sintering control. Furthermore, in the present invention, a preset cooling speed is obtained by establishing a neural network model. Specifically, a working condition cooling neural network model is established according to historical working condition information and historical actual cooling speeds, and current working condition information is obtained. The preset cooling speed is determined according to the current working condition information and the working condition cooling neural network model.

[0040] Furthermore, in order to obtain the horizontal estimated sintering end line to guide sintering, all the horizontal estimated sintering end points Zi are linearly fitted to obtain the horizontal estimated sintering end line.

[0041] Furthermore, in order to accurately determine the sintering endpoint, a plurality of sintering reference observation points i are evenly spaced along the extension direction of the target observation line.

[0042] It is understandable that the thickness of the combustion zone is 20 to 30 mm. In order to accurately determine the sintering end point, the sintering reference distance is not greater than 30 mm. In a preferred embodiment of the present invention, the vertical distance between the current sintering cross-section line and the actual base material layer is 5 mm.

[0043] It can be understood that the material at the current sintering section observation line position adjacent to the real base material layer and above the real base material layer may be raw material (the temperature of raw material is generally low, generally below 600°C), or it may be burned clinker that has just been sintered (the material temperature is between 1230°C and 1280°C), or it may be cooled clinker after sintering (the material temperature is generally between 600°C and 1230°C).

[0044] Further, the current temperature interval value of the target observation line is obtained, and if the current temperature interval value of the target observation line is less than the preset ignition temperature threshold, a prompt message is issued. Optionally, the preset ignition temperature threshold can be pre-set, and 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.

[0045] It can be understood that a sensor is installed at the tail mark position of the sintering machine to track the trolley inclination angle A, the distance between the tail mark of the sintering machine and the penultimate bellows is known data, the effective actual sintering section thermal image and the real cross-sectional image of the target batch trolley have a known correlation ratio, and when the trolley inclination angle A is reached, the thermal imaging camera takes a picture of the sintering machine tail section to obtain the effective actual sintering section thermal image.

[0046] It can be understood that as the sintering trolley moves, the combustion zone gradually moves downward, and the mixture passing through the combustion zone is roasted into sintered ore; when the target batch 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 at the same time the air will also cool the sintered ore area above the combustion zone that has been formed.

[0047] It can be understood that in the present invention, the position of the base material layer of the effective 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 trolley; the position of the base material layer of the effective actual sintering cross-section thermal imaging can also be determined by the theoretical base material layer of the ideal sintering thermal imaging.

[0048] Furthermore, the initial actual sintering cross-sectional thermal imaging image of each target sintering trolley corresponding to the target batch trolley is obtained; the distorted initial actual sintering cross-sectional thermal imaging image is filtered out; the initial actual sintering cross-sectional thermal imaging image after the distortion is filtered out is processed to isolate and filter the area with a material layer thickness of more than 1 / 3 of the initial actual sintering cross-sectional thermal imaging image; the initial actual sintering cross-sectional thermal imaging image after image processing is overlapped and averaged for secondary processing to obtain the effective actual sintering cross-sectional thermal imaging of the target batch trolley.

[0049] The present invention also provides an online sintering finish line acquisition system, comprising a sintering machine, a sintering trolley, a thermal imaging acquisition device and a processing device. The sintering trolley is movably arranged along the sintering machine head wheel toward the sintering machine tail mark line. The sintering machine is provided with a material distribution area, an ignition furnace area and a holding furnace area in sequence at one end close to the sintering machine head wheel. A gas blowing area is provided downstream of the holding furnace area, and a gas blowing device is provided in the gas blowing area. The thermal imaging acquisition device is arranged on the outside of the sintering machine tail mark line of the sintering machine, and the thermal imaging acquisition device is used to obtain the effective actual sintering section thermal image of the target batch trolley. The processing device is used to execute the steps of the above-mentioned method for obtaining the sintering finish line online.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for obtaining a sintering finish line online, characterized in that: The steps include: S10, obtaining the effective actual sintering cross-section thermal imaging of the target batch trolley, the effective actual sintering cross-section thermal imaging having a thermal imaging base material layer and a horizontally arranged thermal imaging target observation line, the thermal imaging target observation line being above the thermal imaging base material layer and having a thermal imaging vertical preset distance with the thermal imaging base material layer, the thermal imaging base material layer being a space layer occupied by the actual base material on the bottom surface of the target batch trolley, the effective actual sintering cross-section thermal imaging having a known correlation ratio with the real cross-section image of the target batch trolley, the thermal imaging base material layer corresponding to the real base material layer of the real cross-section image, the thermal imaging 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 a current sintered ore temperature value Ti of each sintering reference observation point i on the current sintering cross-sectional observation line, wherein the plurality of sintering reference observation points i are arranged at intervals along an extension direction of the current sintering cross-sectional observation line; S30, using the formula Calculate and obtain the sintering cooling horizontal distance corresponding to the sintering reference observation point i, wherein Tm is the sintering material temperature when the sintering is completed, CR is the preset cooling speed, Sv is the moving speed of the sintering trolley, and Li is the sintering cooling horizontal distance corresponding to the sintering reference observation point i; S40, obtaining a horizontal estimated sintering end point Zi of each sintering reference observation point i according to the sintering cooling horizontal distance corresponding to each sintering reference observation point i and the sintering machine tail mark line.

2. The method for obtaining the sintering finish line online according to claim 1, characterized in that: Also includes the steps: All the horizontal estimated sintering end points Zi are linearly fitted to obtain the horizontal estimated sintering end line.

3. The method for obtaining the sintering finish line online according to claim 1, characterized in that: The sintering reference distance is no greater than 30 mm.

4. The method for obtaining the sintering finish line online according to claim 1, characterized in that: Also includes the steps: If the current sintering temperature value Ti is less than the preset ignition temperature threshold, a prompt message is issued.

5. The method for obtaining the sintering finish line online according to claim 1, characterized in that: The number of the sintering reference observation points i is not less than 3.

6. The method for obtaining the sintering finish line online according to claim 1, characterized in that: The preset cooling rate is 90°C / min to 110°C / min.

7. The method for obtaining the sintering finish line online according to any one of claims 1 to 6, characterized in that: Acquire an initial actual sintering cross-section thermal imaging image of each target sintering trolley corresponding to the target batch of trolleys; filtering out the distorted initial actual sintered cross-section thermal imaging image; Performing image processing on the initial actual sintering cross-section thermal imaging image after filtering out distortion, isolating and filtering an area of ​​the initial actual sintering cross-section thermal imaging image that is greater than 1 / 3 of the material layer thickness; The initial actual sintering cross-section thermal imaging image after image processing is overlapped and averaged for secondary processing to obtain the effective actual sintering cross-section thermal imaging of the target batch of trolleys.

8. An online sintering finish line system, characterized in that: It comprises 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 arranged on the outer side of the sintering machine tail wheel of the sintering machine, and the thermal imaging acquisition device is used to acquire the effective actual sintering cross-section thermal image of the target batch trolley; The processing device is used to perform the steps of the method for obtaining a sintering finish line online as claimed in any one of claims 1 to 7.

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