Sintering finish line adjusting method and system for sintering abnormity of tail section

Abstract

The invention provides a sintering finish line adjusting method and system for abnormal sintering of a tail section, and the method comprises the steps: obtaining a visible light imaging graph of the tail section of a current sinter, obtaining the gas injection flow in the current state when the current sintering state is an abnormal state, and adjusting the sintering finish line when the gas injection flow is in an effective flow adjusting range. And when two conditions that the fuel gas injection flow is greater than a preset threshold value are met at the same time, according to the expected sintering finish line and a pre-established machine speed position algorithm model, determining a sintering pallet machine speed calculation value corresponding to the condition that the actual sintering finish line is adjusted to the expected sintering finish line in the current state, and when the machine speed calculation value of the sintering pallet is within the effective machine speed adjustment range, the current fuel gas injection flow is kept unchanged, and the machine speed of the sintering pallet is adjusted to the machine speed calculation value of the sintering pallet. By adopting visible light detection and adopting a mode of combining fuel gas injection and machine speed regulation, the stability and energy-saving and emission-reducing effects of sintering machine equipment are considered as much as possible.

Description

Technical Field

[0001] The invention relates to the technical field of sintering, and in particular to a method and system for adjusting a sintering finish line for abnormal sintering of a tail section. Background Art

[0002] The sintering end point is an important process parameter that is closely related to the sintering quality, output and cost. The sintering end point can indicate the end point where the material layer on the sintering trolley is calcined, that is, the sintering end position.

[0003] In the prior art, the technologies for regulating the sintering endpoint position can be divided into three categories: one is to control the sintering endpoint by controlling the sintering trolley speed; the second is to control the sintering endpoint by controlling the sintering main exhaust fan system (negative pressure, air volume); the third is to control the sintering endpoint by controlling the thickness of the sintering material layer. The existing methods for regulating the sintering endpoint are too dependent on the main structure of the sintering system. This dependence is reflected in, for example, that adjusting the machine speed will cause frequent changes in the equipment state and the equipment is in an unstable working state. If the material layer thickness is adjusted frequently, it will cause fluctuations in output / capacity. If the fan air volume is adjusted frequently, it will also cause the equipment to be in an unstable working state, increasing the technical problems of equipment wear and energy consumption.

[0004] In addition, some sintering plants in China have begun to use gas injection technology, that is, injecting gas during the sintering process, using gas instead of carbon to participate in the sintering process. Obviously, after the gas participates in the sintering process, it will affect the vertical combustion speed, thereby affecting the sintering end point position, but the prior art currently does not have a control method for adjusting the sintering end point by adjusting the gas, especially there is no specific adjustment method. Secondly, the fuel added during the sintering process provides heat for the sintering process. At present, the fuel is mainly coke powder and coal powder, and the mass ratio of the sintering fuel is about 4%. The combustion process produces a large amount of CO2, which is not friendly to the environment. How to take into account energy conservation and emission reduction is also a problem that needs to be solved in this field.

[0005] In view of this, it is necessary to propose a sintering finish line adjustment method and system for abnormal sintering of the tail section to solve or at least alleviate the above defects. Summary of the invention

[0006] The main purpose of the present invention is to provide a sintering endpoint adjustment method and system for abnormal sintering of the tail section, so as to solve the technical problem of how to balance equipment stability and energy saving and emission reduction during the sintering endpoint adjustment process.

[0007] To achieve the above object, the present invention provides a method for adjusting the sintering finish line of abnormal sintering of the tail section, comprising the steps of:

[0008] S1, obtaining a visible light imaging image of the tail section of the current sintering machine, and judging whether the current state is an abnormal sintering state according to the visible light imaging image;

[0009] S2, when the current sintering state is an abnormal state, determining the gas injection flow rate in the current state, and judging whether the gas injection flow rate is within the effective flow rate adjustment range, and judging whether the gas injection flow rate is greater than a preset threshold value; wherein the preset threshold value is within the effective flow rate adjustment range and is less than the upper limit value of the effective flow rate adjustment range;

[0010] S3, when the gas injection flow rate is within the effective flow rate adjustment range and the two conditions that the gas injection flow rate is greater than the preset threshold value are simultaneously met, the actual sintering end line in the current state is determined to be adjusted to the calculated value of the sintering trolley speed corresponding to the expected sintering end line according to the expected sintering end line and the pre-established machine speed position algorithm model; wherein the machine speed position algorithm model includes a mapping relationship between the sintering trolley speed and the sintering end line;

[0011] S4, when the calculated value of the sintering trolley speed is within the effective speed adjustment range, the current gas injection flow rate is maintained unchanged, and the sintering trolley speed is adjusted to the calculated value of the sintering trolley speed; when the calculated value of the sintering trolley speed is not within the effective speed adjustment range, a preset alarm instruction is sent to the target object; wherein the preset alarm instruction includes: one or more of issuing a prompt voice instruction, issuing an alarm instruction, sending information to a server or a target account, and cutting off the power of the sintering machine system.

[0012] Preferably, the step S2 further includes the following steps:

[0013] When the gas injection flow rate is within the effective flow rate adjustment range and the gas injection flow rate is less than the preset threshold, two conditions are simultaneously met, determining the abnormal type of the current state;

[0014] Determining the adjustment amount of the gas injection flow rate according to the abnormal type of the current state;

[0015] The gas injection flow rate in the current state is adjusted according to the adjustment amount, and a preset reaction time is waited, and then the process returns to step S1.

[0016] Preferably, the step S2 further includes the following steps:

[0017] When the gas injection flow rate is within the effective flow rate adjustment range and when both conditions that the gas injection flow rate is less than the preset threshold value are not met, a preset alarm instruction is sent to the target object.

[0018] Preferably, the step S1 specifically comprises the steps of:

[0019] S11, judging whether there is a highlighted burning zone area in the visible light imaging image according to the visible light imaging image; when there is a highlighted burning zone area in the visible light imaging image, executing steps S12 to S13; when there is no highlighted burning zone area in the visible light imaging image, determining that the current state is an over-burned sintering state, and entering step S2;

[0020] S12, obtaining the current calculated combustion zone centerline according to the highlighted combustion zone area; wherein the current calculated combustion zone centerline is parallel to the top surface of the bottom material of the trolley;

[0021] S13, determine whether the vertical deviation distance between the current calculated combustion zone centerline and the ideal combustion zone centerline is greater than a preset threshold; when the vertical deviation distance is greater than the preset threshold, determine that the current state is an under-sintering state, and enter step S2; wherein, the ideal combustion zone centerline is the boundary line between the bottom surface of the sintered mixture and the bottom material of the trolley.

[0022] Preferably, after "determining whether the vertical deviation distance between the center line of the current calculated combustion zone and the center line of the ideal combustion zone is greater than a preset threshold" in step S13, the following steps are further included:

[0023] S1300, when the vertical deviation distance is less than or equal to a preset threshold, evenly dividing the visible light imaging image along the width direction of the sintering trolley to form a plurality of visible light partitions; and determining whether each of the visible light partitions has a corresponding sub-highlight combustion zone area;

[0024] S1301, collecting all visible light partitions with sub-highlight burning zone areas to obtain an effective visible light set;

[0025] S1302, determining the sub-operation combustion zone center line corresponding to the sub-highlight combustion zone area of ​​each visible light partition in the effective visible light set, and sorting them in descending order along the cross-section height of the sintering trolley to obtain a set of effective sub-operation combustion zone center lines;

[0026] S1303, determining the difference between the sub-operation combustion zone center line with the largest height value and the sub-operation combustion zone center line with the smallest height value in the valid sub-operation combustion zone center line set;

[0027] S1304, when any one of the conditions that the difference is greater than the first preset value and the center line of the sub-operation combustion zone with the largest height value is greater than the second preset value is met, the current state is determined to be an abnormal sintering state, and the process goes to step S2.

[0028] Preferably, the effective flow rate adjustment range is set at 0.005-0.1 Nm 3 / s, and / or the preset threshold is 0.006Nm 3 / s.

[0029] The present invention also provides a sintering end line adjustment system for abnormal sintering of the tail section, comprising a sintering machine body, a gas injection device, a visible light imaging device and a control system, wherein the sintering machine body comprises a material distribution area, an ignition furnace area and a holding furnace area, a gas injection area is provided downstream of the holding furnace area, and the gas injection device is provided in the gas injection area, wherein:

[0030] The gas injection device comprises a gas injection main pipe and a plurality of gas injection branch pipes arranged in parallel along the width direction of the sintering trolley; the gas injection main pipe is provided with the gas regulating valve; each of the gas injection branch pipes is connected to the gas injection main pipe, and a plurality of fuel nozzles for injecting gas toward the top surface of the sintering material layer are installed at the bottom of each gas injection branch pipe;

[0031] The visible light imaging device comprises an inclination sensor for detecting the inclination angle of the sintering trolley at the tail wheel of the sintering machine and a visible light imaging device for photographing a visible light imaging image of the tail section of the sintering machine; the inclination sensor is signal-linked with the visible light imaging device;

[0032] The gas injection device and the visible light imaging device are both connected to the control system, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the sintering finish line adjustment method and system for abnormal sintering of the tail section are implemented as described above.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a sintering end line adjustment method and system for abnormal sintering of the tail section of the machine, by obtaining the visible light imaging image of the current sintering machine tail section, when the current sintering state is abnormal, the gas injection flow rate in the current state is obtained, when the gas injection flow rate is within the effective flow adjustment range, and when the two conditions of the gas injection flow rate being greater than the preset threshold are simultaneously met, the actual sintering end line in the current state is determined according to the expected sintering end line and the pre-established machine speed position algorithm model to adjust the sintering trolley machine speed calculation value corresponding to the expected sintering end line, when the sintering trolley machine speed calculation value is within the effective machine speed adjustment range, the current gas injection flow rate is maintained unchanged, and the sintering trolley machine speed is adjusted to the sintering trolley machine speed calculation value. This application uses visible light detection and a combination of gas injection and machine speed adjustment to take into account the stability of the sintering machine equipment and the energy-saving and emission reduction effects as much as possible. Specifically, when the gas injection flow rate does not exceed the preset threshold, the sintering finish line is adjusted by adjusting the gas injection flow rate. The gas injection uses coke oven gas and natural gas to be injected on the sintering material surface to form a gas fuel combustion zone, which provides heat for the sintering ore formation process, reduces the fuel ratio in the sintered ore, and can significantly reduce (more than 10%) CO2 emissions. When the gas injection flow rate is within the effective flow rate adjustment range and when the two conditions that the gas injection flow rate is greater than the preset threshold are met at the same time, the gas injection flow rate is maintained unchanged and the sintering machine speed is adjusted to achieve an adjustment method that minimizes equipment fluctuations and achieves emission reductions, thereby taking into account the stability of the sintering machine equipment and the energy-saving and emission reduction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 It is a process flow chart of a sintering system in the prior art;

[0037] Figure 2 It is a schematic diagram of the sintered ore formation process in the prior art;

[0038] Figure 3 It is one of the cross-sectional schematic diagrams of the sintering ore formation process in the prior art;

[0039] Figure 4 The second schematic cross-sectional view of the sintering ore formation process in the prior art;

[0040] Figure 5A schematic diagram of sintering cross-section formation and imaging in one embodiment of the present invention;

[0041] Figure 6 A side view of a schematic diagram of the overall structure of an embodiment of the present invention;

[0042] Figure 7 A top view of a schematic diagram of the overall structure of an embodiment of the present invention;

[0043] Figure 8 A schematic diagram of the formation of gas injection sintered ore in one embodiment of the present invention;

[0044] Fig. 9 is a schematic diagram of an actual sintering section of an ideal sintering section of the present invention;

[0045] Fig.10 Schematic diagram of visible light imaging of an actual sintered cross section of an ideal sintered cross section of the present invention;

[0046] Fig.11 is a schematic diagram of visible light imaging of an actual sintered cross section in one embodiment of the present invention;

[0047] Fig.12 A schematic diagram of an actual sintering cross section in one embodiment of the present invention;

[0048] Fig.13 is a schematic diagram of secondary image processing in one embodiment of the present invention;

[0049] Fig.14 is a schematic diagram of a flow chart in one embodiment of the present invention;

[0050] Fig.15 This is a flowchart diagram of the steps included after "determining whether the vertical deviation distance between the current calculated combustion zone centerline and the ideal combustion zone centerline is greater than a preset threshold" in step S13 in one embodiment of the present invention.

[0051] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In order to enable those skilled in the art to fully understand the technical solution of this application, it should be known that the sintering system mainly includes a sintering machine trolley, a mixer, a main exhaust fan, an annular cooler and other equipment. Figure 1 As shown: 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 machine 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 machine 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 finished ore bin after screening and granulation. Among them, the oxygen required for the sintering process is provided by the main exhaust fan. A number of vertically arranged bellows are arranged under the sintering machine trolley. Below the bellows is a horizontally placed large flue (or flue), which 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.

[0057] Please refer to Figure 2-4 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 machine trolley moves from the head to the tail of the sintering machine, and the moving speed of the sintering machine trolley is the sintering machine speed. When the combustion zone moves to the bottom of the sintering machine trolley mixture, the corresponding position of the sintering machine trolley relative to the sintering machine head is the sintering end point. Figure 2 As shown in the figure, with the movement of the sintering machine trolley, the combustion zone gradually moves downward, and the mixed material passing through the combustion zone is roasted into sintered ore; Figure 3As shown in the figure, during the sintering process, the materials in the sintering machine car can be divided into a bottom material layer, a mixed material layer, a combustion zone layer and a sintering ore layer from bottom to top. Figure 4 As shown, when the combustion zone moves to the bed material layer, the materials in the sintering machine 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 meal will be produced, the fuel utilization rate is high, the sintering efficiency is high, and the quality of the sintered ore is good.

[0058] In one embodiment of the present invention, the sintering end position is controlled to be the target sintering end position when the position of the second to last bellows or the first to last bellows is set. Figure 6 As shown, the speed at which the combustion zone moves downward is called the sintering speed, which is represented by LV, in millimeters.min-1; the thickness of the material layer on the sintering machine is represented by H, in millimeters; there is a base material under the sintering mixture, which is a finished sintered ore of a certain particle size, and its thickness can be represented by PH, in millimeters; in the process of stable sintering production, the sintering speed is considered to be a constant value. After the sintered ore passes through the ignition furnace and starts the sintering process, its sintering time ST (in min) is

[0059] ST=(H-PH) / LV (1)

[0060] Controlling the sintering end point to the target sintering end point position is an important means of sintering control. During the sintering process, after the mixed material is laid on the sintering machine trolley, controlling the sintering end point at the last bellows or the second to last bellows of the sintering machine can achieve the most reasonable use of the sintering machine area. The corresponding sintering section at this time is as follows Figure 4 As shown; that is, the ideal sintering end position can be regarded as a position point within a fixed distance from the ignition position of the sintering material surface; that is, the moving distance S of the rear car after the ignition of the sintering material surface has an optimal value S0, and the position corresponding to S0 is the target sintering end position.

[0061] like Figure 2 As shown in the figure, within the sintering time ST, the relationship between the sintering machine trolley moving distance S (unit: m), the sintering machine trolley speed SV (unit: m / min), and the sintering time ST is shown in formula 2:

[0062] S=ST*SV (2)

[0063] Available

[0064]

[0065] In summary, the existing technologies for adjusting the sintering end point can be divided into three categories: the existing methods for adjusting the sintering end point are relatively simple. The first is to adjust the sintering end point by controlling the speed of the sintering trolley; the second is to adjust the sintering end point by controlling the sintering main exhaust fan system (negative pressure, air volume); the third is to adjust the sintering end point by controlling the thickness of the sintering material layer. There is a technical problem that these adjustment methods are too dependent on the main structure of the sintering system. This dependence is reflected in, for example, that adjusting the machine speed will cause frequent changes in the equipment state and the equipment will be in an unstable working state. If the thickness of the material layer is adjusted frequently, it will cause fluctuations in output / capacity. If the fan air volume is adjusted frequently, it will also cause the equipment to be in an unstable working state, increasing the technical problems of equipment wear and energy consumption.

[0066] Please refer to Figure 5-13 Through the study of sintering technology, it is found that during the sintering process, injecting gas into the sintering material and using gas instead of carbon to participate in the sintering process can affect the vertical combustion speed, thereby affecting the sintering end position. Specifically, after the gas is sprayed onto the sintering material surface, it enters the sintering material layer with the air. When the gas reaches the temperature area above the solid combustion zone that is higher than the gas combustion point, the gas is ignited to form a gas combustion zone suspended above the solid combustion zone; the gas combustion zone will burn downward synchronously with the solid combustion zone, and the heat released by the gas combustion zone will be quickly conducted downward and superimposed on the solid combustion zone, thereby accelerating the combustion speed of the solid combustion zone and increasing the combustion temperature of the solid combustion zone.

[0067] Please refer to Figure 11-13 Through the study of sintering technology, in the process of sintering ore generation, because the air permeability of sintering ore at various places on the sintering machine trolley is not exactly the same, the sintering end point in actual production will not be an ideal straight line (ideal sintering end line), and the bright line reflected in visible light is not an ideal straight line. In actual production, those in front of the ideal sintering end line can be considered as premature sintering, and the production capacity of the sintering machine is not fully utilized, resulting in a decrease in the output of sintered ore. Those behind the ideal sintering end line can be considered as over-sintering, which ultimately affects the quality of sintered ore.

[0068] Please refer to Figure 5-7 The present invention provides a sintering end line adjustment system for abnormal sintering of the tail section, comprising a sintering machine body, a gas injection device, a visible light imaging device and a control system. The sintering machine body comprises a material distribution area, an ignition furnace area and a holding furnace area. A gas injection area is provided downstream of the holding furnace area. The gas injection device is provided in the gas injection area.

[0069] The gas injection device comprises a gas injection main pipe and a plurality of gas injection branch pipes arranged in parallel along the width direction of the sintering trolley; the gas injection main pipe is provided with the gas regulating valve; each of the gas injection branch pipes is connected to the gas injection main pipe, and a plurality of fuel nozzles for injecting gas toward the top surface of the sintering material layer are installed at the bottom of each gas injection branch pipe;

[0070] The visible light imaging device comprises an inclination sensor for detecting the inclination angle of the sintering trolley at the tail wheel of the sintering machine and a visible light imaging device for photographing a visible light imaging image of the tail section of the sintering machine; the inclination sensor is signal-linked with the visible light imaging device;

[0071] The gas injection device and the visible light imaging device are both connected to the control system, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the sintering finish line adjustment method and system for abnormal sintering of the tail section are implemented as described below.

[0072] Optionally, the gas injection zone is arranged adjacent to the insulation furnace zone, a gas injection device is provided in the gas injection zone, and a gas injection branch pipe is arranged opposite to the trolley track and is used to spray gas to the trolley on the trolley track passing through the gas injection zone.

[0073] In addition, the gas injection main pipe is connected to an external fuel storage device. As long as a stable supply of fuel is ensured, a stable sintering working state can be guaranteed.

[0074] It should be noted that the tilt sensor is interlocked with the visible light imaging device signal. The sintering machine trolley carries sintered ore and moves forward under the drive of the sintering head and tail wheels. At the sintering tail wheels, the sintering machine trolley begins to tilt, and the continuous sintering material surface begins to break from the tilt of the trolley. When the tail wheel drives the trolley to reach the tilt angle A, the tilt sensor can capture this angle, and the whole piece of sintered ore on the tilting trolley slides off the trolley. The sintered ore section of the adjacent sintering machine trolley can be fully displayed in front of the camera. The schematic diagram of the sintering section formation and imaging can be referred to in the attached figure. Figure 9-12 As shown:

[0075] Therefore, an inclination sensor can be installed on the tail wheel of the sintering machine to track the inclination angle A of the sintering machine trolley. When the inclination angle A of the sintering machine trolley is reached, the visible light camera takes a picture of the sintering machine tail section, thereby obtaining a visible light imaging image of the sintering machine tail section. In other embodiments, those skilled in the art can also choose other technical means, as long as they can capture the unloading section between two adjacent sintering machine trolleys.

[0076] In a preferred embodiment, the plurality of gas injection branch pipes are evenly arranged along the width direction of the sintering machine trolley, and the plurality of burner nozzles of each gas injection branch pipe are evenly arranged along the length direction of the gas injection branch pipe. By evenly arranging, the effect of the entire sintering end point controlled by gas injection is more accurate (each partition can be adjusted by individually controlling each partition). In other embodiments, those skilled in the art can also adaptively adjust the spacing distance between the plurality of gas injection pipes, or adaptively adjust the spacing distance between the plurality of burner nozzles on each gas injection branch pipe. In addition, by evenly arranging, it is convenient for each sub-partition (one gas injection branch pipe can be set to correspond to one sub-partition), and targeted adjustment of the sub-partition can be achieved, thereby adjusting the uniformity of the sintered ore.

[0077] Please see attached Figure 14-15 The present invention provides a method and system for adjusting the sintering end line of abnormal sintering of the tail section, comprising the steps of:

[0078] S1, obtaining a visible light imaging image of the tail section of the current sintering machine, and judging whether the current state is an abnormal sintering state according to the visible light imaging image;

[0079] S2, when the current sintering state is an abnormal state, determine the gas injection flow rate in the current state, and judge whether the gas injection flow rate is within the effective flow adjustment range, and judge whether the gas injection flow rate is greater than a preset threshold value; wherein the preset threshold value is within the effective flow adjustment range and is less than the upper limit value of the effective flow adjustment range; wherein the preset threshold value is within the effective flow adjustment range and is less than the upper limit value of the effective flow adjustment range; specifically, the gas injection flow rate in the current state can be obtained by installing a flow meter on the gas injection main pipe.

[0080] S3, when the gas injection flow rate is within the effective flow rate adjustment range, and when the two conditions that the gas injection flow rate is greater than the preset threshold value are simultaneously met, the actual sintering end line in the current state is determined to be adjusted to the calculated value of the sintering trolley speed corresponding to the expected sintering end line according to the expected sintering end line and the pre-established machine speed position algorithm model; wherein the machine speed position algorithm model includes the mapping relationship between the sintering trolley speed and the sintering end line; it is worth noting that the machine speed position algorithm model of the present application is obtained through pre-theoretical derivation and verified through specific examples (specific examples below), and has high calculation accuracy. Since the pre-established machine speed position algorithm model includes the mapping relationship between the material layer thickness and the sintering end line, the corresponding calculated value of the sintering trolley speed can be calculated after knowing the expected sintering end line and the gas injection flow rate in the current state. By adjusting the machine speed in the current state to this value, the corresponding actual sintering end line can be adjusted to the expected sintering end line position.

[0081] S4, when the calculated value of the sintering trolley speed is within the effective speed adjustment range, the current gas injection flow rate is maintained unchanged, and the sintering trolley speed is adjusted to the calculated value of the sintering trolley speed; when the calculated value of the sintering trolley speed is not within the effective speed adjustment range, a preset alarm instruction is sent to the target object; wherein the preset alarm instruction includes: one or more of issuing a prompt voice instruction, issuing an alarm instruction, sending information to a server or a target account, and cutting off the power of the sintering machine system.

[0082] In the present application, by obtaining the visible light imaging image of the tail section of the current sintering machine, when the current sintering state is abnormal, the gas injection flow rate in the current state is obtained, when the gas injection flow rate is within the effective flow adjustment range, and when the two conditions of the gas injection flow rate being greater than the preset threshold are simultaneously met, the actual sintering end line in the current state is determined according to the expected sintering end line and the pre-established machine speed position algorithm model to adjust the sintering trolley machine speed calculation value corresponding to the expected sintering end line, and when the sintering trolley machine speed calculation value is within the effective machine speed adjustment range, the current gas injection flow rate is maintained unchanged, and the sintering trolley machine speed is adjusted to the sintering trolley machine speed calculation value. The present application adopts visible light detection and a combination of gas injection and machine speed regulation to take into account the stability of the sintering machine equipment and the energy-saving and emission reduction effects as much as possible. Specifically, when the gas injection flow rate does not exceed the preset threshold, the sintering finish line is adjusted by adjusting the gas injection flow rate. The gas injection uses coke oven gas and natural gas to be injected on the sintering material surface to form a gas fuel combustion zone, which provides heat for the sintering ore formation process, reduces the fuel ratio in the sintered ore, and can significantly reduce (more than 10%) CO2 emissions. When the gas injection flow rate is within the effective flow rate adjustment range and when the two conditions that the gas injection flow rate is greater than the preset threshold are met at the same time, the gas injection flow rate is maintained unchanged and the sintering machine speed is adjusted to achieve an adjustment method that minimizes equipment fluctuations and achieves emission reductions, thereby taking into account the stability of the sintering machine equipment and the energy-saving and emission reduction effects.

[0083] Among them, the machine speed position algorithm model can be

[0084]

[0085] Wherein, S is the position of the sintering finish line, SV is the theoretical calculated value of the sintering trolley speed corresponding to the sintering finish line S; H is the total thickness of the material layer on the sintering trolley, PH is the thickness of the bottom material layer, SV is the sintering trolley speed, c is the thickness of the solid combustion zone, k1 is the heat transfer coefficient, h is the gas combustion heat, t is the duration of gas injection, m is the unit sintering machine material amount, z is the material layer thickness below the gas combustion zone, and Cp is the average specific heat capacity of the sintering material.

[0086] Specifically, in order to further illustrate the machine speed position algorithm model and facilitate those skilled in the art to understand the machine speed position algorithm model of the present application, the derivation process of the model is now specifically described:

[0087] First, according to the heat balance formula, the heat release power of gas fuel burning in the material layer can be calculated by formula 4:

[0088] P1=Q*h Formula 4

[0089] Where: P1: fuel heating power, unit W; Q: gas fuel flow, unit Nm 3 / s; h: Combustion heat of gas fuel, unit J / Nm 3 ;

[0090] It can be understood that part of the heat released by the combustion of the gas fuel will be directly transferred to the solid combustion zone with a thickness of c located in the lower layer, so that its initial temperature will be increased by ΔT compared with the conventional sintering temperature; part of the heat will pass through the solid combustion zone in the form of flue gas sensible enthalpy, continue to be transferred downward and add to the materials under the solid combustion zone; among them, the initial temperature increase ΔT of the material to be ignited near the solid combustion zone can be calculated by Formula 5 and Formula 6:

[0091] Secondly, the heat generated by combustion is carried away by the flue gas, heating the material under the combustion zone. After the flue gas passes through the material and solid combustion zone, the flue gas temperature will rise. By comparing the flue gas temperature of the bellows before gas injection and the flue gas temperature of the bellows after gas injection, the heat carried away by the flue gas and the heat left in the material can be calculated.

[0092] The heat remaining in the material heats all the materials below the gas combustion zone. The ratio of the heat remaining in the material to the heat taken away by the flue gas can be calculated, and the temperature rise of the material can be calculated. The gas combustion zone gradually moves downward, that is, the solid material heated by the heat of the gas combustion zone gradually decreases as the sintering machine moves forward. The flue gas passes through the sintering ore layer, the gas combustion zone, the sintering ore layer between the gas-solid combustion zone, the solid combustion zone, and the mixed material layer; the flue gas is heated by the sintering ore layer and gradually increases in temperature; after passing through the gas combustion zone and the solid combustion zone, the temperature increases and heats the lower layer materials. Because the gas combustion zone and the solid combustion zone gradually move downward, the heated lower layer materials gradually decrease;

[0093] According to the heat balance formula P2=k1*P1, (Formula 5) the heat P2 directly transferred from the gas combustion to the material below the gas combustion zone is determined; wherein P2 is the heat directly transferred from the gas combustion to the material, in units of W;

[0094] According to the formula Determine the initial temperature increase ΔT of the material to be ignited near the solid combustion zone caused by gas combustion;

[0095] Where: P2: heat directly transferred to the material by gas combustion, unit W; k1: transfer coefficient, dimensionless; (slightly different for different sintering machines, it can be regarded as a constant under the stable working condition of the same sintering machine); ΔT: initial temperature increase of solid combustion zone material brought by gas fuel, unit K; m is the material amount per unit sintering machine, unit kg; z: thickness of the material layer under the gas combustion zone, unit m; H: total thickness of the material layer, unit m; Cp: average specific heat capacity of sintering material, unit J / (kg*K); t: duration of gas injection, unit s;

[0096] The specific derivation process of formula 6 is as follows:

[0097] From the derivation of formula 5, it can be seen that the heat of P2 is transferred to the material layer below the combustion zone, and the thickness of the material layer below the combustion zone is Z; the total thickness of the material layer is H;

[0098] During the gas injection period, the materials above the gas combustion zone will not be heated by the heat provided by the gas combustion zone, and the amount of heated materials below the gas combustion zone is m*(z / H), and the duration is t;

[0099] Formula 6a can be derived

[0100]

[0101] T2: Initial material temperature; T1: Temperature of the material after being heated by the gas combustion zone

[0102] ΔT=T1-T2

[0103] Substituting formula 4 and 6a into formula 6, we can obtain:

[0104]

[0105] In formula 7, the transfer coefficient k1, the combustion heat of gas fuel h, and the average specific heat capacity Cp of sintering materials can be regarded as constants. Under the condition of stable production of the sintering machine, the total thickness of the material layer H, the material amount per unit sintering machine m, and the gas injection time t can be regarded as constants. The thickness of the material layer z under the gas combustion zone gradually decreases as the sintering machine moves forward. In the gas injection range, the average value can be taken as 0.75*H~0.85*H. The coefficient K1 can be obtained as shown in formula 8:

[0106] According to the formula P1 = Q*h, the formula P2 = k1*P1 and the formula Determine

[0107] Substituting formula 8 into formula 7, we get:

[0108] ΔT=K1*Q Formula 9

[0109] It can be seen from Formula 9 that when the sintering machine speed is stable, the initial temperature rise value of the solid combustion zone material under the gas combustion zone and the gas flow rate can be approximately regarded as a linear relationship.

[0110] It should be noted that the combustion of sintered solid fuel mainly includes four processes: 1. Preheating of carbon powder; 2. Volatile analysis; 3. Combustion of volatiles; 4. Combustion of residual carbon. The latter three processes involving complex heat transfer, mass transfer and chemical reaction coupling can be collectively referred to as the full combustion process. The total time tt of solid fuel combustion can be approximately regarded as the sum of the time t1 for the carbon powder residual heat to reach the ignition point temperature and the time t2 for the carbon powder to be fully burned. The effect of gas injection on the combustion rate of solid fuel is mainly manifested in increasing the temperature of the starting reactants, thereby reducing the preheating time t1. After the solid fuel starts to burn, the full combustion time t2 remains unchanged.

[0111] Before and after gas injection, the heat transfer coefficient between the sintering material layer and the high-temperature gas can be approximately considered unchanged. Therefore, the preheating time t1 can be calculated by formula 10:

[0112]

[0113] Where: Tc: ignition point temperature of carbon powder, unit K; T0: initial temperature of combustion zone material before injection, unit K; ΔT: initial temperature increase of combustion zone material caused by gas injection, unit K; V: material layer heating rate, unit K / s;

[0114] Therefore, the total time tt of solid fuel combustion can be calculated using formula 11:

[0115]

[0116] Obviously, the fuel thickness in the solid combustion zone divided by the total time of solid fuel combustion is the combustion speed of the solid combustion zone moving downward, and formula 12 can be obtained:

[0117]

[0118] Substituting Formula 9 into Formula 11, we get:

[0119]

[0120] Typical values ​​of relevant parameters are shown in Table 1

[0121] Table 1: Typical values ​​of relevant parameters

[0122]

[0123]

[0124] Substituting typical values ​​into formula 13, we get:

[0125]

[0126] Right now

[0127]

[0128] Substituting formula 12 into formula 10, we get:

[0129]

[0130] Substituting Formula 15 into Formula 3, we get:

[0131]

[0132] According to formula 16, the machine speed position algorithm model of this application is obtained:

[0133]

[0134] Here are some examples:

[0135] The material layer thickness of a sintering machine is H = 0.7m, the bottom material layer thickness is PH = 0.1m, the unit sintering machine material quantity is 250kg, the sintering trolley speed is SV = 0.035m / s, the solid combustion zone thickness is c = 0.03m, the bottom material layer thickness is PH = 0.1m, the average specific heat capacity of the sintering material is Cp = 1600J / (kg*K), the gas injection time is 500s, the transfer coefficient is k1 = 0.35, and the unit gas combustion heat is h = 30000000J / Nm 3 ;

[0136] When the gas injection flow rate is 0Nm 3 / s, we can calculate:

[0137]

[0138] The total length of the sintering machine is 90 meters, the length of a single wind box is 4 meters, the length from the material distribution to the ignition position is 10 meters, the length from the starting position of the solid combustion zone to the gas injection position is 10 meters, and the length of the gas injection section is 20 meters;

[0139] Without considering gas injection, the ideal sintering end point is at the tail of the sintering machine, that is, 90-14=76 meters; if the combustion zone thickness is considered to be 25mm and the material layer is considered to be 800mm, the calculated position is 74.06m; matching the actual situation, it can be seen that the above flow position model is accurate.

[0140] As another example, when the gas injection flow rate is 0.006 Nm 3 / s, we can calculate:

[0141]

[0142] As another example, when the gas injection flow rate is 0.005 Nm 3 / s, we can calculate:

[0143]

[0144] The accuracy of Formula 16 can be verified through the above specific examples, which also shows that the machine speed position algorithm model of the present application has high accuracy and can be used to guide the adjustment of the machine speed.

[0145] As a preferred embodiment, the step S2 further includes the following steps:

[0146] When the gas injection flow rate is within the effective flow rate adjustment range and the gas injection flow rate is less than the preset threshold, two conditions are simultaneously met, determining the abnormal type of the current state;

[0147] Determining the adjustment amount of the gas injection flow rate according to the abnormal type of the current state;

[0148] The gas injection flow rate in the current state is adjusted according to the adjustment amount, and a preset reaction time is waited, and then the process returns to step S1.

[0149] In this embodiment, when the gas injection flow rate is within the effective flow rate adjustment range and when the two conditions that the gas injection flow rate is less than the preset threshold value are met at the same time, the gas injection flow rate can be adjusted. Specifically, when the abnormal type of the current state is an over-burning sintering state, the gas injection flow rate can be reduced for adjustment, and the preset time is waited for, and then re-detection is performed for analysis and judgment; when the abnormal type of the current state is an under-burning sintering state, the gas injection flow rate can be increased for adjustment, and the preset time is waited for, and then re-detection is performed; wherein the preset time can be determined by the formula ST=S1 / SV, wherein S1 is the distance from the starting point of the gas injection to the desired sintering end line, and SV is the moving speed of the sintering trolley.

[0150] As another preferred embodiment, the step S2 further includes the following steps:

[0151] When the gas injection flow rate is within the effective flow rate adjustment range and when both conditions that the gas injection flow rate is less than the preset threshold value are not met, a preset alarm instruction is sent to the target object.

[0152] As a preferred implementation, the step S1 specifically includes the following steps:

[0153] S11, judging whether there is a highlighted burning zone area in the visible light imaging image according to the visible light imaging image; when there is a highlighted burning zone area in the visible light imaging image, executing steps S12 to S13; when there is no highlighted burning zone area in the visible light imaging image, determining that the current state is an over-burned sintering state, and entering step S2;

[0154] S12, obtaining the current calculated combustion zone centerline according to the highlighted combustion zone area; wherein the current calculated combustion zone centerline is parallel to the top surface of the bottom material of the trolley; in order to facilitate quantification of the distance between the highlighted combustion zone area and the current calculated combustion zone centerline, the highlighted combustion zone area is used to obtain the current calculated combustion zone centerline that can represent the position of the highlighted combustion zone area. It can be understood that the method of obtaining the current calculated combustion zone centerline from the highlighted combustion zone area can be a rough calculation or a more accurate calculation method. In order to facilitate quantification of the distance between the highlighted combustion zone area and the top surface of the bottom material of the sintering trolley, the current calculated combustion zone centerline of the present application is parallel to the top surface of the bottom material of the sintering trolley, that is, a horizontal line parallel to the top surface of the bottom material of the sintering trolley.

[0155] S13, determine whether the vertical deviation distance between the current calculated combustion zone centerline and the ideal combustion zone centerline is greater than a preset threshold; when the vertical deviation distance is greater than the preset threshold, determine that the current state is an under-sintering state, and enter step S2; wherein, the ideal combustion zone centerline is the boundary line between the bottom surface of the sintered mixture and the bottom material of the trolley.

[0156] It is worth noting for those skilled in the art that the sintered ore formation process is a process in which the sintering combustion zone gradually moves downward. The combustion temperature of the sintering combustion zone is about 1250°C. The sintering mixture is mixed with various ingredients 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. 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 trolley is also moving toward the tail of the machine. Under ideal conditions, when the sintering trolley moves to the appropriate area at the tail of the sintering machine, the combustion zone reaches the bottom material layer. At this time, the utilization rate of the sintering area is the highest, which is most beneficial to production. It can be known that the preset threshold in this embodiment is set to ensure that the sintering state is as close to the ideal state as possible. Therefore, when the vertical deviation distance between the center line of the current calculation combustion zone and the center line of the ideal combustion zone is greater than the preset threshold, it means that after the sintering trolley moves to the set position at the tail of the sintering machine, the combustion zone is still a certain distance away from the bottom material layer, indicating that there are still many raw ores between the current calculation combustion zone and the center line of the ideal combustion zone that have not been effectively sintered, that is, the current actual sintering end line lags behind the target sintering end line, and this state should be regulated at this time. On the contrary, when the vertical deviation distance is less than or equal to the preset threshold, it means that the sintering mixture between the current calculation combustion zone and the center line of the ideal combustion zone is less (within the acceptable range in this field) or all of them are effectively sintered, that is, it is determined that the current actual sintering end point is within the tolerance range of the target sintering end point, and the current state is maintained to continue production.

[0157] As a preferred embodiment, after the step S13 of "determining whether the vertical deviation distance between the center line of the current calculated combustion zone and the center line of the ideal combustion zone is greater than a preset threshold value", the following steps are further included:

[0158] S1300, when the vertical deviation distance is less than or equal to a preset threshold, evenly dividing the visible light imaging image along the width direction of the sintering trolley to form a plurality of visible light partitions; and determining whether each of the visible light partitions has a corresponding sub-highlight combustion zone area;

[0159] S1301, collecting all visible light partitions with sub-highlight burning zone areas to obtain an effective visible light set;

[0160] S1302, determining the sub-operation combustion zone center line corresponding to the sub-highlight combustion zone area of ​​each visible light partition in the effective visible light set, and sorting them in descending order along the cross-section height of the sintering trolley to obtain a set of effective sub-operation combustion zone center lines;

[0161] S1303, determining the difference between the sub-operation combustion zone center line with the largest height value and the sub-operation combustion zone center line with the smallest height value in the valid sub-operation combustion zone center line set;

[0162] S1304, when any one of the conditions that the difference is greater than the first preset value and the center line of the sub-operation combustion zone with the largest height value is greater than the second preset value is met, the current state is determined to be an abnormal sintering state, and the process goes to step S2.

[0163] It should be noted that when the vertical deviation distance is less than or equal to the preset threshold, the sintering state may still be an abnormal state (for example, the cross section along the sintering trolley is uneven) or a normal state. This implementation determines whether each of the visible light partitions has a corresponding sub-highlight combustion zone area, determines the sub-operational combustion zone centerline corresponding to the sub-highlighted combustion zone area of ​​each visible light partition in the effective visible light set, and sorts them in order from small to large along the cross-sectional height of the sintering trolley to obtain a set of effective sub-operational combustion zone centerlines. When any one of the conditions that the difference is greater than the first preset value and the sub-operational combustion zone centerline with the largest height value is greater than the second preset value is met, it means that the visible light partitions are relatively dispersed and uneven, thereby affecting the quality of the sintered ore, and the current state is determined to be an abnormal sintering state. When the difference is less than or equal to the first preset value and the sub-operational combustion zone centerline with the largest height value is less than the second preset value is met at the same time, it is determined to be a normal sintering state, and the current state is maintained to continue production.

[0164] As a specific example, the effective flow rate adjustment range is set at 0.005 to 0.1 Nm 3 / s, and / or the preset threshold is 0.006Nm 3 / s.

[0165] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for adjusting the sintering end line of a tail section in which abnormal sintering is beneficial to carbon reduction, characterized in that: Includes steps: S1, obtaining a visible light imaging image of the tail section of the current sintering machine, and judging whether the current state is an abnormal sintering state according to the visible light imaging image; S2, when the current sintering state is an abnormal state, determining the gas injection flow rate in the current state, and judging whether the gas injection flow rate is within the effective flow rate adjustment range, and judging whether the gas injection flow rate is greater than a preset threshold value; wherein the preset threshold value is within the effective flow rate adjustment range and is less than the upper limit value of the effective flow rate adjustment range; S3, when the gas injection flow rate is within the effective flow rate adjustment range and the two conditions that the gas injection flow rate is greater than the preset threshold value are simultaneously met, the actual sintering end line in the current state is determined to be adjusted to the calculated value of the sintering trolley speed corresponding to the expected sintering end line according to the expected sintering end line and the pre-established machine speed position algorithm model; wherein the machine speed position algorithm model includes a mapping relationship between the sintering trolley speed and the sintering end line; S4, when the calculated value of the sintering trolley speed is within the effective speed adjustment range, the current gas injection flow rate is maintained unchanged, and the sintering trolley speed is adjusted to the calculated value of the sintering trolley speed; when the calculated value of the sintering trolley speed is not within the effective speed adjustment range, a preset alarm instruction is sent to the target object; wherein the preset alarm instruction includes: one or more of issuing a prompt voice instruction, issuing an alarm instruction, sending information to a server or a target account, and cutting off the power of the sintering machine system.

2. The sintering finish line adjustment method for abnormal sintering of the tail section according to claim 1 is characterized in that: The step S2 further includes the following steps: When the gas injection flow rate is within the effective flow rate adjustment range and the gas injection flow rate is less than the preset threshold, two conditions are simultaneously met, determining the abnormal type of the current state; Determining the adjustment amount of the gas injection flow rate according to the abnormal type of the current state; The gas injection flow rate in the current state is adjusted according to the adjustment amount, and a preset reaction time is waited, and then the process returns to step S1.

3. The sintering finish line adjustment method for abnormal sintering of the tail section according to claim 1, characterized in that: The step S2 further includes the following steps: When the gas injection flow rate is within the effective flow rate adjustment range and when both conditions that the gas injection flow rate is less than the preset threshold value are not met, a preset alarm instruction is sent to the target object.

4. The method for adjusting the sintering finish line of the tail section sintering abnormality according to claim 2, characterized in that: The step S1 specifically includes the following steps: S11, judging whether there is a highlighted burning zone area in the visible light imaging image according to the visible light imaging image; when there is a highlighted burning zone area in the visible light imaging image, executing steps S12 to S13; when there is no highlighted burning zone area in the visible light imaging image, determining that the current state is an over-burned sintering state, and entering step S2; S12, obtaining the current calculated combustion zone centerline according to the highlighted combustion zone area; wherein the current calculated combustion zone centerline is parallel to the top surface of the bottom material of the trolley; S13, determine whether the vertical deviation distance between the current calculated combustion zone centerline and the ideal combustion zone centerline is greater than a preset threshold; when the vertical deviation distance is greater than the preset threshold, determine that the current state is an under-sintering state, and enter step S2; wherein, the ideal combustion zone centerline is the boundary line between the bottom surface of the sintered mixture and the bottom material of the trolley.

5. The sintering finish line adjustment method for abnormal sintering of the tail section according to claim 4 is characterized in that: After "determining whether the vertical deviation distance between the center line of the current calculated combustion zone and the center line of the ideal combustion zone is greater than a preset threshold" in step S13, the following steps are also included: S1300, when the vertical deviation distance is less than or equal to a preset threshold, evenly dividing the visible light imaging image along the width direction of the sintering trolley to form a plurality of visible light partitions; and determining whether each of the visible light partitions has a corresponding sub-highlight combustion zone area; S1301, collecting all visible light partitions with sub-highlight burning zone areas to obtain an effective visible light set; S1302, determining the sub-operation combustion zone center line corresponding to the sub-highlight combustion zone area of ​​each visible light partition in the effective visible light set, and sorting them in descending order along the cross-section height of the sintering trolley to obtain a set of effective sub-operation combustion zone center lines; S1303, determining the difference between the sub-operation combustion zone center line with the largest height value and the sub-operation combustion zone center line with the smallest height value in the valid sub-operation combustion zone center line set; S1304, when any one of the conditions that the difference is greater than the first preset value and the center line of the sub-operation combustion zone with the largest height value is greater than the second preset value is met, the current state is determined to be an abnormal sintering state, and the process goes to step S2.

6. The method for adjusting the sintering finish line of abnormal sintering at the tail section according to claim 1, characterized in that: The effective flow rate adjustment range is set at 0.005~0.1Nm 3 / s, and / or the preset threshold is 0.006Nm 3 / s.

7. A sintering finish line adjustment system for abnormal sintering of the tail section, characterized in that: The invention comprises a sintering machine body, a gas injection device, a visible light imaging device and a control system. The sintering machine body comprises a material distribution area, an ignition furnace area and a heat preservation furnace area. A gas injection area is arranged downstream of the heat preservation furnace area. The gas injection device is arranged in the gas injection area. The gas injection device comprises a gas injection main pipe and a plurality of gas injection branch pipes arranged in parallel along the width direction of the sintering trolley; the gas injection main pipe is provided with the gas regulating valve; each of the gas injection branch pipes is connected to the gas injection main pipe, and a plurality of fuel nozzles for injecting gas toward the top surface of the sintering material layer are installed at the bottom of each gas injection branch pipe; The visible light imaging device comprises an inclination sensor for detecting the inclination angle of the sintering trolley at the tail wheel of the sintering machine and a visible light imaging device for photographing a visible light imaging image of the tail section of the sintering machine; the inclination sensor is signal-linked with the visible light imaging device; The gas injection device and the visible light imaging device are both connected to the control system, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the sintering finish line adjustment method and system for abnormal sintering of the tail section are implemented as described in any one of claims 1 to 6.

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