A sintering endpoint line adjustment method and system based on flue gas temperature anomaly

Abstract

The application provides a sintering endpoint line adjustment method and system based on flue gas temperature anomaly, wherein the flue gas temperature of each temperature measuring unit is obtained, when the flue gas fitting curve of the sintering wind box has a curve inflection point, the actual sintering endpoint line in the current state is obtained according to the curve inflection point, when the current sintering state is an abnormal state, the first gas injection flow calculation value corresponding to the adjustment of the actual sintering endpoint line in the current state to the expected sintering endpoint line is determined according to the expected sintering endpoint line and a pre-established position flow algorithm model, when the first gas injection flow calculation value is in the effective flow adjustment range, the current gas injection flow is adjusted to the first gas injection flow calculation value by adjusting the gas injection adjustment valve. The application can quickly determine the flow adjustment value corresponding to the adjustment of the abnormal state to the normal state through the position flow algorithm model by the flue gas temperature and when the sintering state is determined to be abnormal, so as to ensure the normal sintering state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sintering, and particularly relates to a sintering endpoint line adjustment method and system based on flue gas temperature anomaly. BACKGROUND

[0002] With the rapid development of modern industry, the steel production scale is getting larger and larger, and the energy consumption is getting more and more, so the energy saving and environmental protection indicators become more and more important factors in the steel production process. In the steel production, the iron-containing raw ore needs to be treated by the sintering system before entering the blast furnace for smelting, that is, various powdery iron-containing raw materials are mixed with appropriate amount of fuel (coal powder, coke powder) and flux, and appropriate amount of water is added, and after mixing and balling, they are placed on the sintering trolley for roasting, so that a series of physical and chemical changes occur, and the sintered ore which is easy to smelt is formed, and this process is called sintering.

[0003] The sintering endpoint is an important process parameter closely related to the sintering quality, yield and cost, and the sintering endpoint can represent the end point of the roasting of the material layer on the sintering trolley, that is, the end position of sintering. Controlling the sintering endpoint at the desired sintering endpoint position is the key to improving the yield and fully utilizing the sintering area. If the actual sintering endpoint is earlier than the desired sintering endpoint position, it means that there is overburning, and the production capacity of the sintering machine (for example, the sintering area corresponding to the last few fans from the actual combustion end point) is not fully utilized, thereby reducing the sintered ore yield / production capacity; if the actual sintering endpoint is later than the desired sintering endpoint position, it means that the mixed material on the sintering trolley has not been completely roasted before it runs to the tail for unloading, at this time, there is still a lot of raw material between the actual sintering endpoint corresponding combustion zone and the bottom layer, which causes underburning and ultimately affects the sintered ore quality.

[0004] Some sintering plants in China begin to use gas injection technology to improve the sintering endpoint position, that is, to inject gas during the sintering process to replace 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 endpoint position, but the existing technology currently has no control method for adjusting the sintering endpoint by adjusting the gas, especially no specific adjustment method.

[0005] Therefore, it is necessary to provide a sintering endpoint line adjustment method and system based on flue gas temperature anomaly to solve or at least alleviate the above problems. SUMMARY

[0006] The main purpose of the present application is to provide a sintering endpoint line adjustment method and system based on flue gas temperature anomaly, so as to solve the problem that the existing technology currently has no specific quantitative control method for adjusting the sintering endpoint by adjusting the gas, resulting in low adjustment efficiency.

[0007] To achieve the above object, the application provides a sintering endpoint line adjustment method based on flue gas temperature anomaly, comprising the following steps:

[0008] S1, obtaining the wind box flue gas temperature obtained by each temperature measuring unit; wherein each sintering wind box is provided with a temperature measuring unit for detecting the wind box flue gas temperature passing through the sintering material, and a plurality of temperature measuring units in the same sintering wind box are arranged along the length direction of the sintering pallet;

[0009] S2, sequentially fitting the wind box flue gas temperatures obtained by all temperature measuring units in the direction from the sintering machine head wheel to the sintering machine tail wheel to obtain a sintering wind box flue gas fitting curve;

[0010] S3, judging whether the sintering wind box flue gas fitting curve has a curve inflection point, and when the sintering wind box flue gas fitting curve has a curve inflection point, obtaining an actual sintering endpoint line in the current state according to the curve inflection point, and judging whether the current sintering state is an abnormal state according to the actual sintering endpoint line;

[0011] S4, when the current sintering state is an abnormal state, determining a first gas injection flow calculation value corresponding to the adjustment of the actual sintering endpoint line in the current state to the expected sintering endpoint line according to the expected sintering endpoint line and a pre-established position flow algorithm model; wherein the position flow algorithm model comprises a mapping relationship between the gas injection flow and the sintering endpoint line;

[0012] S5, when the first gas injection flow calculation value is within the effective flow adjustment range, adjusting the gas injection adjustment valve to adjust the current gas injection flow to the first gas injection flow calculation value.

[0013] Preferably, the "position flow algorithm model" in the step S2 is specifically:

[0014]

[0015] wherein S is the sintering endpoint line, Q is the theoretical calculation value of the required gas injection flow corresponding to the sintering endpoint line S; H is the total thickness of the material layer on the sintering pallet, PH is the bottom material layer thickness, SV is the sintering pallet speed, c is the solid combustion zone thickness, k1 is the heat transfer coefficient, h is the gas combustion heat, t is the gas injection duration, m is the unit sintering machine material quantity, z is the material layer thickness below the gas combustion zone, and Cp is the average specific heat capacity of the sintering material.

[0016] Preferably, the "judging whether the current sintering state is an abnormal state according to the actual sintering endpoint line" in the step S4 specifically comprises the following steps:

[0017] S41, judging whether the actual sintering terminal line lags behind the expected sintering terminal line in the running direction of the sintering machine; when the actual sintering terminal line lags behind the expected sintering terminal line in the running direction of the sintering machine, executing steps S42-S43; when the actual sintering terminal line leads the expected sintering terminal line in the running direction of the sintering machine, executing step S44;

[0018] S42, determining the lateral distance between the actual sintering terminal line and the expected sintering terminal line, and judging whether the lateral distance is greater than a preset threshold value;

[0019] S43, when the lateral distance is greater than the preset threshold value, determining that the current sintering state is an overburning sintering state; when the lateral distance is less than or equal to the preset threshold value, determining that the current sintering state is a normal sintering state;

[0020] S44, determining that the current sintering state is a normal sintering state.

[0021] Preferably, the step S3 further comprises the following steps:

[0022] S31, when the sintering wind box flue gas fitting curve does not have a curve inflection point, determining that the current sintering state is an underburning sintering state, and determining the second calculated gas injection flow value required for adjusting the actual sintering terminal line in the underburning state to the expected sintering terminal line according to the expected sintering terminal line and the position-flow algorithm model;

[0023] S32, when the second calculated gas injection flow value is within the effective flow adjustment range, adjusting the gas injection adjustment valve to adjust the current gas injection flow to the second calculated gas injection flow value.

[0024] Preferably, the step S3 of "determining the actual sintering terminal line in the current state according to the curve inflection point" specifically comprises the following steps:

[0025] Taking the position of the temperature measuring unit corresponding to the curve inflection point in the running direction of the sintering machine as the actual sintering terminal line in the current state.

[0026] Preferably, the step S4 of "determining the first calculated gas injection flow value corresponding to the adjustment of the actual sintering terminal line in the current state to the expected sintering terminal line according to the expected sintering terminal line and the pre-established position-flow algorithm model" further comprises the following steps:

[0027] S400, when the current sintering state is an abnormal state, obtaining sintering state information within a first time length after the current sintering state is an abnormal state, and judging whether the sintering state at a first time node at the end of the first time length is an abnormal state;

[0028] S401, when the sintering state at the first time node at the end of the first time length is an abnormal state, entering the step of "determining the first gas blowing flow calculation value corresponding to the adjustment of the actual sintering endpoint line to the expected sintering endpoint line in the current state according to the expected sintering endpoint line and the pre-established position flow algorithm model";

[0029] S402, when the sintering state at the first time node at the end of the first time length is a normal state, returning to step S1.

[0030] Preferably, the step S4 further comprises the step of:

[0031] S500, when the current sintering state is a normal state, maintaining the current sintering state to continue production.

[0032] The application also provides a sintering endpoint line adjustment system based on flue gas temperature anomaly, comprising a sintering machine body, a gas blowing device and a control system, the sintering machine body comprising a distribution area, an ignition furnace area and a holding furnace area, a gas blowing area being provided downstream of the holding furnace area, and the gas blowing device being provided in the gas blowing area, wherein,

[0033] The gas blowing device comprises a gas blowing main pipe and a plurality of gas blowing branch pipes arranged side by side along the width direction of the sintering pallet; the gas regulating valve is installed on the gas blowing main pipe; each of the gas blowing branch pipes is in communication with the gas blowing main pipe, and the bottom of each of the gas blowing branch pipes is provided with a plurality of gas nozzles for blowing gas towards the top surface of the sintering material layer;

[0034] The sintering machine body further comprises a plurality of sintering air boxes located directly below the sintering pallet, and each of the sintering air boxes is provided with a temperature measuring unit for detecting the flue gas temperature of the sintering material passing through the air box; the plurality of temperature measuring units in the same sintering air box are arranged in the length direction of the sintering pallet.

[0035] The gas blowing device and the temperature measuring unit are connected with the control system, and the control system comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the sintering endpoint line adjustment method based on flue gas temperature anomaly as described above.

[0036] Compared with the prior art, the application has the following beneficial effects:

[0037] The application provides a sintering endpoint line adjustment method and system based on flue gas temperature anomaly, wherein the flue gas temperature of each temperature measuring unit is obtained, when the flue gas fitting curve of the sintering wind box has a curve inflection point, the actual sintering endpoint line in the current state is obtained according to the curve inflection point, when the current sintering state is an abnormal state, the first gas injection flow calculation value corresponding to the adjustment of the actual sintering endpoint line in the current state to the expected sintering endpoint line is determined according to the expected sintering endpoint line and a pre-established position flow algorithm model, when the first gas injection flow calculation value is in the effective flow adjustment range, the current gas injection flow is adjusted to the first gas injection flow calculation value by adjusting the gas injection adjustment valve. The application can quickly determine the flow adjustment value corresponding to the adjustment of the abnormal state to the normal state through the position flow algorithm model according to the flue gas temperature and when the sintering state is determined to be abnormal, so as to ensure the normal sintering state. The position flow algorithm model of the application is obtained through theoretical derivation and verified by specific examples, has high accuracy, can quickly determine the corresponding required gas injection calculation value according to the expected sintering endpoint line position, thereby reducing the repeated adjustment process and greatly improving the efficiency of sintering endpoint adjustment.

[0038] In addition, the application adjusts the sintering endpoint position by gas injection, does not need to frequently adjust the sintering machine speed or the material layer thickness or the fan air volume, can ensure that the sintering system as a whole is in a stable production state, can ensure the stability of the sintering working state as long as the stability of the fuel is ensured, is more in line with the needs of actual production, in addition, has the energy-saving and emission-reducing effect and is more environmentally friendly by replacing carbon with gas. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0040] Figure 1 It is a sintering system process flow diagram in the prior art;

[0041] Figure 2 It is a schematic diagram of the sinter formation process in the prior art;

[0042] Figure 3 It is one of the cross-sectional schematic diagrams of the sinter formation process in the prior art;

[0043] Figure 4 It is the second cross-sectional schematic diagram of the sinter formation process in the prior art;

[0044] Figure 5A side view of a schematic diagram of an overall structure in an embodiment of the present application;

[0045] Figure 6 A top view of a schematic diagram of an overall structure in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of formation of gas injection sintered ore in an embodiment of the present application;

[0047] Figure 8 A side view of a schematic diagram of an overall structure with a temperature measuring unit in an embodiment of the present application;

[0048] Figure 9 A top view of a schematic diagram of an overall structure with a temperature measuring unit in an embodiment of the present application;

[0049] Figure 10 A flowchart in an embodiment of the present application.

[0050] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0051] It should be understood that the specific embodiments described herein merely exemplify the present application and do not limit the present application.

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0053] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0054] In addition, the descriptions of "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0055] For those skilled in the art to fully understand the technical solutions of the present application, it should be known that the existing sintering system mainly includes a sintering pallet, a mixer, a main air extractor, a circular cooler and other devices. The sintering system process flow chart is shown in Figure 1 The various raw materials are proportioned in the proportioning room to form a mixture, the mixture is mixed and balling in the mixer, and then the mixture is uniformly spread on the sintering pallet to form a sintering mixture layer through the circular roller feeder and the nine-roller distributor, the ignition fan and the ignition fan start the ignition furnace, the sintering mixture on the uppermost layer of the sintering pallet is ignited in the ignition furnace, the ignited combustion zone starts to move from top to bottom, and the mixture passing through the combustion zone is sintered into sinter. After the sintering is completed, the sinter is crushed by a single-roller crusher and then enters the circular cooler for cooling, and finally, after screening and granulating, it is sent to the blast furnace or the finished product bin. Among them, the oxygen required for the sintering process is provided by the main air extractor, and a plurality of vertical and side-by-side air boxes are arranged below the sintering pallet, and a horizontal large flue (or flue) is arranged below the air box, the large flue is connected with the main air extractor, and the negative pressure air generated by the main air extractor through the large flue and the air box passes through the pallet to provide combustion-supporting air for the sintering process.

[0056] Please refer to Figures 2-4 In the prior art, the ignited combustion zone moves from top to bottom, the moving speed of the combustion zone is the vertical sintering speed, the sintering pallet moves from the head to the tail of the sintering machine, and the moving speed of the sintering pallet is the sintering machine speed. When the combustion zone moves to the bottom of the mixture (the position of the bottom layer), the position of the sintering pallet relative to the head of the sintering machine is the sintering end position. As shown in Figure 2 With the movement of the sintering pallet, the combustion zone gradually moves down, and the mixture passing through the combustion zone is sintered into sinter; as shown in Figure 3 (fuel zone at the top position), in the sintering process, the material in the sintering pallet can be divided into a bottom layer, a mixture layer, a combustion zone and a sinter layer from bottom to top, wherein the bottom layer is a finished sinter of a certain particle size. As shown in Figure 4 When the combustion zone moves to the bottom layer, the material in the sintering pallet has been completely sintered into sinter, and at this time the corresponding position is the sintering end position, which is generally represented by the air box number. Alternatively, the combustion zone has a certain thickness, and the sintering end position can be understood as the bottom of the combustion zone just contacting the bottom layer, and the sintering end position is controlled at the second last air box or the last air box, so that no raw material is produced, the fuel utilization rate is high, the sintering efficiency is high, and the quality of the sinter is good. In other words, the ideal sintering end position can be regarded as a point at a fixed distance from the ignition position of the sintering material surface.

[0057] In one embodiment of the present application, the control of the sintering end point position is targeted at the last but one or the last but one and a half wind box position, as shown in Figure 5 The speed of the downward movement of the combustion zone is referred to as the sintering speed, denoted as LV, with the unit of m / s; the thickness of the material layer on the sintering machine is denoted as H, with the unit of m; the underlayer of the sintering mixture is a certain size of finished sintering ore, and the thickness can be denoted as PH, with the unit of m; in the process of stable production of sintering, the sintering speed is considered as a constant value. After the sintering ore passes through the ignition furnace and starts the sintering process, the sintering time ST (unit: min),

[0058] ST = (H-PH) / LV Formula 1

[0059] The control of the sintering end point as the target sintering end point position is an important means of sintering control. In the sintering process, after the mixture is laid on the sintering trolley, the sintering end point is controlled at the last wind box or the last but one wind box of the sintering machine, which can achieve the most reasonable use of the area of the sintering machine, and the sintering section at this time is as shown in Figure 4 That is, the ideal sintering end point position can be considered 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 sintering trolley after the ignition of the sintering material surface has an optimal value S0, and the position corresponding to S0 is the target sintering end point position.

[0060] As shown in Figure 2 In the sintering time ST, the relationship among the moving distance S (unit: m) of the sintering trolley, the sintering trolley speed SV (unit: m / min), and the sintering time ST is shown in Formula 2:

[0061] S = ST*SV Formula 2

[0062] According to (1) and (2), we can get

[0063]

[0064] In summary, according to Formula (3), the existing techniques for adjusting the sintering end point can be classified into three categories: the existing ways of adjusting the sintering end point are relatively single, one is to adjust the sintering end point by controlling the sintering trolley speed SV; two is to adjust the sintering end point by controlling the sintering main fan system (negative pressure, air volume) to adjust the sintering speed LV; three is to adjust the sintering end point by controlling the sintering material layer thickness H. These adjustment methods have a high dependence on the main structure of the sintering system. This dependence is reflected in, for example, the frequent changes in the state of the equipment caused by the adjustment of the speed, which causes the equipment to be in an unstable working state. If the material layer thickness is frequently adjusted, the yield / production capacity will fluctuate. If the air volume of the fan is frequently adjusted, the equipment will also be in an unstable working state, which increases the technical problems of equipment wear and energy consumption.

[0065] Please refer to Figures 5-9 Through research on sintering technology, it has been found that injecting gas into the sintering material during the sintering process, using gas instead of carbon, can affect the vertical combustion rate (i.e., sintering velocity LV), thereby influencing the sintering endpoint. Specifically, after the gas is injected onto the sintering material surface, it enters the sintering material layer with the air. When the gas reaches the area above the solid combustion zone where the temperature is higher than the gas combustion point temperature, the gas is ignited, forming a gas combustion zone suspended above the solid combustion zone. The gas combustion zone burns downwards synchronously with the solid combustion zone, and the heat released from the gas combustion zone is quickly conducted downwards and superimposed on the solid combustion zone, thereby accelerating the combustion speed of the solid combustion zone and increasing its combustion temperature.

[0066] A schematic diagram of sinter formation after gas is blown into the sintering material surface is attached. Figure 7 As shown, Figure 7 As shown, after the gas is injected onto the sintering material surface, it enters the sintering material layer with the air. When the gas reaches the area above the solid combustion zone where the temperature is higher than the gas combustion point temperature, the gas is ignited, forming a gas combustion zone suspended above the solid combustion zone.

[0067] The gas combustion zone burns downwards synchronously with the solid combustion zone. The heat released from the gas combustion zone is quickly conducted downwards and superimposed on the solid combustion zone, thereby accelerating the combustion speed of the solid combustion zone and increasing its combustion temperature.

[0068] In practical applications, considering safety and other factors, the maximum volume fraction of the injected gas is 0.8%, meaning the maximum volume of gas injected into the sintering material is 0.8% of the volume of air entering the sintering material. Solutions already exist for issues related to nozzle arrangement and thorough mixing of gas and air, and are not within the scope of this discussion. The oxygen consumed by the combustion of gas with a volume fraction below 0.8% has virtually no impact on the combustion of solid fuels in the sinter. The volume fraction can be linearly converted to the flow rate of regulating valve F1; for example, the gas volume fraction is 0.8% at the maximum flow rate L1, and 0.4% at 0.5 times L1.

[0069] Those skilled in the art will understand that in actual production, if the actual sintering endpoint is ahead of the ideal sintering endpoint, it can be considered premature sintering, and the production capacity of the sintering machine is not fully utilized, resulting in a reduction in the output of sintered ore. If the actual sintering endpoint is behind the ideal sintering endpoint, it can be considered over-sintering, which ultimately affects the quality of sintered ore.

[0070] Please refer to the appendix again. Figures 5-9The application provides a sintering endpoint line adjustment system based on flue gas temperature anomaly, which comprises a sintering machine body, a gas injection device and a control system, wherein the sintering machine body comprises a distribution area, an ignition furnace area and a holding furnace area, a gas injection area is arranged downstream of the holding furnace area, and the gas injection area is provided with the gas injection device, wherein

[0071] 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 pallet; the gas injection main pipe is provided with the gas regulating valve; each gas injection branch pipe is in communication with the gas injection main pipe, and the bottom of each gas injection branch pipe is provided with a plurality of gas injection nozzles for injecting gas towards the top surface of the sintering material layer.

[0072] The sintering machine body further comprises a plurality of sintering air boxes arranged directly below the sintering pallet, each sintering air box is provided with a temperature measuring unit for detecting the flue gas temperature of the sintering material passing through the air box, and the plurality of temperature measuring units in the same sintering air box are arranged in the length direction of the sintering pallet.

[0073] The gas injection device and the temperature measuring unit are connected with the control system, the control system comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the sintering endpoint line adjustment method based on flue gas temperature anomaly.

[0074] Optionally, the gas injection area is arranged adjacent to the holding furnace area, the gas injection device is arranged in the gas injection area, the gas injection branch pipes are arranged opposite to the pallet track and used for injecting gas to the pallet on the pallet track passing through the gas injection area, and the gas injection area is arranged as 15-20m along the length direction of the sintering machine body.

[0075] In addition, the gas injection main pipe is in communication with an external fuel storage device (not shown in the figure), as long as the stable supply of fuel is ensured, the stable sintering working state can be ensured.

[0076] In a preferred embodiment, a plurality of the gas injection branch pipes are uniformly arranged along the width direction of the sintering machine trolley, and a plurality of the gas injection nozzles of each of the gas injection branch pipes are uniformly arranged along the length direction of the gas injection branch pipe. Through uniform arrangement, the effect of sintering endpoint control is more accurate (each sub-zone can be adjusted individually), and in other embodiments, a person skilled in the art can also adaptively adjust the interval distance of a plurality of gas injection pipes, or adaptively adjust the interval distance between a plurality of gas injection nozzles on each gas injection branch pipe. In addition, through uniform arrangement, each sub-zone (one gas injection branch pipe can be arranged for each sub-zone) can be adjusted, so that the uniformity of sinter can be adjusted.

[0077] Please refer to the accompanying drawings Figure 10 The present application provides a sintering endpoint line adjustment method based on flue gas temperature anomaly, comprising the steps of:

[0078] S1, obtaining the wind box flue gas temperature obtained by each temperature measuring unit; wherein each sintering wind box is provided with a temperature measuring unit for detecting the wind box flue gas temperature passing through the sintering material, and a plurality of temperature measuring units in the same sintering wind box are arranged at intervals along the length direction of the sintering trolley; it should be noted that in a preferred embodiment, since the sintering wind box near the sintering machine head is far away from the sintering endpoint, one temperature measuring unit can be arranged for one sintering wind box, and the sintering machine tail wind box (for example, the last 4 sintering wind boxes) covers the area where the sintering endpoint is located, and a plurality of temperature measuring units can be arranged for each sintering wind box, for example, 3 temperature measuring units are arranged for each sintering wind box, and the 3 temperature measuring units are arranged at intervals along the length direction of the sintering trolley.

[0079] S2, fitting the wind box flue gas temperature obtained by all temperature measuring units in sequence according to the direction from the sintering machine head wheel to the sintering machine tail wheel to obtain a sintering wind box flue gas fitting curve; it should be noted that all temperature measuring units are sequentially sorted according to the direction from the sintering machine head wheel to the sintering machine tail wheel, for example, the last temperature measuring unit is close to the sintering machine tail position.

[0080] S3, judging whether the sintering wind box flue gas fitting curve has a curve inflection point, when the sintering wind box flue gas fitting curve has a curve inflection point; obtaining the actual sintering end point line in the current state according to the curve inflection point, and judging whether the current sintering state is an abnormal state according to the actual sintering end point line; it is worth noting that the maximum value of the wind box flue gas temperature (the value of the curve inflection point) can reflect the position of the current combustion zone (i.e. the sintering end point position), and the temperature measuring unit corresponding to the maximum value of the wind box flue gas temperature corresponds to the sintering end point position. When the actual sintering end point line lags behind the expected sintering end point line, it means that the sintering end point line in this state may be close to the expected sintering end point line (which is considered to be an ideal sintering state in the art), or it may be far away from the expected sintering end point line. This state indicates that the sintering area is not fully utilized, and the production capacity and yield are affected, which needs to be further determined and analyzed subsequently.

[0081] In addition, when the actual sintering end point line is ahead of the expected sintering end point line, it means that the actual sintering end point line is between the expected sintering end point line (which is generally considered to correspond to the position of the last wind box or the second last wind box in the art) and the tail of the last sintering wind box. At this time, it can be determined that the actual sintering end point line in the current state is within the allowable range of the expected sintering end point line, and the current state can be maintained to continue production.

[0082] S4, when the current sintering state is an abnormal state, determining the first gas injection flow calculation value corresponding to the adjustment of the actual sintering end point line in the current state to the expected sintering end point line according to the expected sintering end point line and the pre-established position flow algorithm model; wherein the position flow algorithm model comprises a mapping relationship between the gas injection flow and the sintering end point line; it is worth noting that the position flow algorithm model of the present application is obtained by pre-theoretical derivation and is verified by specific examples (specific examples are shown in the following text), and has high calculation accuracy. Since the pre-established position flow algorithm model comprises a mapping relationship between the gas injection flow and the sintering end point line, the corresponding first gas injection flow calculation value can be calculated when the expected sintering end point line is known, and the actual sintering end point line corresponding to the expected sintering end point line can be adjusted to the position of the expected sintering end point line by adjusting the gas injection flow in the current state to the value.

[0083] S5, when the first gas injection flow calculation value is within the effective flow adjustment range, adjusting the gas injection adjustment valve to adjust the current gas injection flow to the first gas injection flow calculation value.

[0084] Specifically, in actual application, considering the safety of gas and other issues, the volume fraction of gas injection is up to 0.8%, that is, the gas injection has an effective injection flow range, and it can be understood that if the current gas injection flow is too large, there is a safety problem. In a specific example, the effective flow adjustment range is set to 0.005-0.1 Nm 3 / s. In other words, when the first gas injection flow calculation value is within 0.005-0.1 Nm 3 / s, the current gas injection flow is adjusted to the first gas injection flow calculation value by adjusting the gas injection adjusting valve, that is, the corresponding actual sintering endpoint line is adjusted to the desired sintering endpoint line position. If the first gas injection flow calculation value is not within the effective flow adjustment range, an alarm can be issued to the target object so that the abnormal condition can be handled in time.

[0085] Further, the "position flow algorithm model" in step S2 is specifically:

[0086]

[0087] Wherein, S is the sintering endpoint line, Q is the theoretical calculation value of the gas injection flow required by the sintering endpoint line S; H is the total thickness of the material layer on the sintering trolley, PH is the bottom material layer thickness, SV is the sintering trolley speed, c is the solid combustion zone thickness, k1 is the heat transfer coefficient, h is the gas combustion heat, t is the gas injection duration, m is the unit sintering machine material quantity, z is the material layer thickness below the gas combustion zone, and Cp is the average specific heat capacity of the sintering material.

[0088] Specifically, in order to further illustrate the position flow algorithm model and facilitate those skilled in the art to understand the position flow algorithm model of the present application, the derivation process of the model will be specifically explained:

[0089] First, according to the heat balance formula, the heat release power of gas fuel combustion in the material layer can be calculated by formula 4:

[0090] P1=Q*h Formula 4

[0091] Wherein: P1: fuel heat release power, unit W; Q: gas fuel flow, unit Nm 3 / s; h: gas fuel combustion heat, unit J / Nm 3 ;

[0092] It can be understood that the heat released by gas fuel combustion, part of which will be directly transferred to the solid combustion zone with a thickness of c located in the lower layer, so that the initial temperature is increased by ΔT compared with the conventional sintering temperature; part of which will pass through the solid combustion zone in the form of smoke apparent heat, continue to transfer downward and heat the material below the solid combustion zone; wherein the initial temperature increase ΔT of the material close to the solid combustion zone below which will be ignited can be calculated by formula 5, formula 6:

[0093] Secondly, the heat generated by combustion is taken away by the flue gas to heat the material below the combustion zone. After the flue gas passes through the material and the solid combustion zone, the temperature of the flue gas will rise. By comparing the flue gas temperature of the air bellow before gas injection and the flue gas temperature of the air bellow after gas injection, the heat taken away by the flue gas and the heat left in the material can be calculated;

[0094] The heat left in the material heats all the material below the gas combustion zone. The ratio of the heat left in the material and 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 heat of the gas combustion zone gradually decreases as the sintering machine advances. The flue gas passes through the sinter layer, the gas combustion zone, the sinter layer between the gas-solid combustion zone, the solid combustion zone and the mixed material layer; the flue gas is heated by the sinter layer and gradually rises in temperature; after passing through the gas combustion zone and the solid combustion zone, the temperature rises and heats the lower layer material. Because the gas combustion zone and the solid combustion zone gradually move downward, the lower layer material heated is gradually reduced;

[0095] According to the heat balance formula P2=k1*P1, (formula 5) the heat P2 directly transferred by gas combustion to the material below the gas combustion zone is determined; wherein P2 is the heat directly transferred by gas combustion to the material, unit W;

[0096] According to the formula The initial temperature increase ΔT of the material close to the solid combustion zone below which will be ignited by the gas combustion zone is determined;

[0097] Wherein: P2: the heat directly transferred by gas combustion to the material, unit W; k1: transfer coefficient, dimensionless; (different sintering machines have slight differences, and the same sintering machine under stable working condition can be regarded as a constant); ΔT: the initial temperature increase of the solid combustion zone material caused by the gas fuel, unit K; m is the unit sintering machine material quantity, unit kg; z: the thickness of the material layer below the gas combustion zone, unit m; H: the total thickness of the material layer, unit m; Cp: the average specific heat capacity of sintering material, unit J / (kg*K); t: the duration of gas injection, unit s;

[0098] Wherein, the specific derivation process of formula 6 is as follows:

[0099] From the derivation of formula 5, it can be known that the heat of P2 is transferred to the material layer below the combustion zone, the thickness of the material layer below the combustion zone is Z, and the total thickness of the material layer is H.

[0100] The material above the gas combustion zone will not be heated by the heat provided by the gas combustion zone during the gas blowing period, and the amount of heated material below the gas combustion zone is m*(z / H), and the duration is t.

[0101] It can be deduced that formula 6a

[0102]

[0103] T2: initial temperature of the material; T1: temperature of the material after being heated by the gas combustion zone

[0104] ΔT = T1-T2

[0105] Substitute formula 4 and 6a into formula 6 to obtain:

[0106]

[0107] In formula 7, the transfer coefficient k1, the gas fuel combustion heat h, and the average specific heat capacity Cp of the sintered material can be regarded as constants. In the case of stable production of the sintering machine, the total thickness of the material layer H, the unit sintering machine material quantity m, and the gas blowing time t can be regarded as constants. The thickness of the material layer below the gas combustion zone z gradually decreases with the progress of the sintering machine. In the gas blowing area, the average value can be taken as 0.75*H-0.85*H. The coefficient K1 can be obtained as formula 8:

[0108] According to formula P1=Q*h, formula P2=k1*P1, and formula It is determined that

[0109] Substitute formula 8 into formula 7 to obtain:

[0110] ΔT=K1*Q formula 9

[0111] From formula 9, it can be known that when the sintering machine speed is stable, the initial temperature rise value of the material below the solid combustion zone and the gas flow can be approximately regarded as a linear relationship.

[0112] It should be noted that the combustion of sintering solid fuel mainly includes: 1, carbon powder preheating temperature rise; 2, volatile analysis; 3, volatile combustion; 4, residual carbon combustion four processes. The latter three processes involving complex heat and 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 carbon powder afterheat temperature rise to the ignition point temperature time t1 and the carbon powder full combustion time t2. The influence of gas blowing on the solid fuel combustion rate mainly manifests in reducing the preheating time t1 by raising the initial reactant temperature, and the full combustion time t2 remains unchanged after the solid fuel starts to burn.

[0113] Before and after gas blowing, 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:

[0114]

[0115] Wherein: Tc: carbon powder ignition point temperature, unit K; T0: initial temperature of material in combustion zone without blowing, unit K; ΔT: initial temperature of material in combustion zone caused by gas blowing, unit K; V: material layer temperature rise rate, unit K / s;

[0116] Therefore, the total time tt of solid fuel combustion can be calculated by formula 11:

[0117]

[0118] Obviously, the thickness of solid fuel in the combustion zone divided by the total time of solid fuel combustion is the combustion speed of the downward movement of the solid combustion zone, and formula 12 can be obtained:

[0119]

[0120] Substituting formula 9 into formula 11, we can get:

[0121]

[0122] The typical values of related parameters are shown in Table 1.

[0123]

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

[0125]

[0126] That is

[0127]

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

[0129]

[0130] Substitute equation 15 into equation 3, we can get:

[0131]

[0132] According to equation 16, the position flow algorithm model of the application is obtained:

[0133]

[0134] For example:

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

[0136] When the gas blowing flow is 0Nm 3 / s, the calculation can be obtained:

[0137]

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

[0139] Without considering gas blowing, the ideal sintering end position is at the tail of the sintering machine, i.e. 90-14 = 76 meters; if the combustion zone thickness is considered to be 25mm and the layer thickness is considered to be 800mm, the calculation position is 74.06m; and the actual situation matches, it can be seen that the above formula 16 is accurate.

[0140] As another example, when the gas blowing flow is 0.006Nm 3 / s, the calculation can be obtained:

[0141]

[0142] As another example, when the gas blowing flow is 0.005Nm 3 / s, the calculation can be obtained:

[0143]

[0144] The accuracy of formula 16 can be verified by the specific examples above, and thus it is illustrated that the position flow algorithm model of the application has high accuracy and can be used to guide the adjustment of the gas injection flow.

[0145] As a preferred embodiment of the application, the step S4 of "judging whether the current sintering state is an abnormal state according to the actual sintering terminal line" specifically comprises the following steps:

[0146] S41, judging whether the actual sintering terminal line lags behind the expected sintering terminal line in the running direction of the sintering machine; when the actual sintering terminal line lags behind the expected sintering terminal line in the running direction of the sintering machine, executing steps S42-S43; when the actual sintering terminal line leads the expected sintering terminal line in the running direction of the sintering machine, executing step S44;

[0147] S42, determining the transverse distance between the actual sintering terminal line and the expected sintering terminal line, and judging whether the transverse distance is greater than a preset threshold value;

[0148] S43, when the transverse distance is greater than the preset threshold value, determining that the current sintering state is an overburning sintering state; when the transverse distance is less than or equal to the preset threshold value, determining that the current sintering state is a normal sintering state;

[0149] S44, determining that the current sintering state is a normal sintering state.

[0150] It can be understood that when the actual sintering terminal line lags behind the expected sintering terminal line in the running direction of the sintering machine and the transverse distance is greater than the preset threshold value, it is determined that the current sintering state is an overburning sintering state, which indicates that the corresponding sintering terminal line is far away from the expected sintering terminal line, and a long sintering area from the actual sintering terminal line to the tail of the sintering machine is not effectively utilized, thereby affecting the capacity / production, and it is determined that the current sintering state is an overburning sintering state (one of the abnormal sintering states).

[0151] In addition, when the transverse distance is less than or equal to the preset threshold value, it indicates that the corresponding sintering terminal line is relatively close to the expected sintering terminal line (which is considered to be a relatively ideal sintering terminal range in the art), and at this time the current sintering state can be determined to continue production.

[0152] As another preferred embodiment, the step S3 further comprises the following step:

[0153] S31, when the sintering wind box flue gas fitting curve does not have a curve inflection point, determining that the current sintering state is an underburning sintering state, and determining the second gas injection flow calculation value required for adjusting the actual sintering terminal line in the underburning state to the expected sintering terminal line according to the expected sintering terminal line and the position flow algorithm model.

[0154] S32, when the second gas injection flow rate calculation value is in the effective flow rate adjustment range, adjusting the gas injection adjustment valve to adjust the current gas injection flow rate to the second gas injection flow rate calculation value.

[0155] It is worth noting that when the sintering wind box flue gas fitting curve does not have a curve inflection point, that is, the current sintering state does not have a corresponding temperature region of the combustion zone of the sintering machine, it can be determined that the current sintering state is an under-fired sintering state (one of the abnormal sintering states), and at this time, the current abnormal state needs to be adjusted. Specifically, the second gas injection flow rate calculation value required for adjusting the actual sintering endpoint in the under-fired state to the desired sintering endpoint line is determined according to the desired sintering endpoint line and the position-flow algorithm model. Since the position-flow algorithm model contains the mapping relationship between the gas injection flow rate and the sintering endpoint line and has sufficient calculation accuracy (the distance of the model has been verified in the foregoing), the second gas injection flow rate calculation value required for adjusting the actual sintering endpoint in the under-fired state to the desired sintering endpoint line is determined according to the desired sintering endpoint line and the position-flow algorithm model. Adjusting the gas injection adjustment valve to adjust the current gas injection flow rate to the second gas injection flow rate calculation value can make the sintering endpoint line position reach within the allowable range of the desired sintering endpoint line, thereby realizing the adjustment of the under-fired abnormal sintering state.

[0156] As a preferred embodiment, the step S3 of "obtaining the actual sintering endpoint line in the current state according to the curve inflection point" specifically includes the steps of:

[0157] Taking the position of the temperature measuring unit corresponding to the curve inflection point along the running direction of the sintering machine as the actual sintering endpoint line in the current state. Since the plurality of temperature measuring units are arranged at intervals along the running direction of the sintering machine, the position of the temperature measuring unit corresponding to the curve inflection point along the running direction of the sintering machine can be taken as the actual sintering endpoint line in the current state. It can be understood that the more the number of temperature measuring units and the smaller the interval distance between the temperature measuring units, the more accurately the actual sintering endpoint line in the current state can be reflected.

[0158] As a preferred embodiment, each of the temperature measuring units is a multi-point thermocouple, the multi-point thermocouple includes a protective sleeve and a plurality of thermocouples uniformly arranged along the length direction of the protective sleeve and installed in the protective sleeve, and the protective sleeve is installed on the sintering wind box along the width direction of the sintering machine pallet;

[0159] Among them, the arithmetic mean of the temperatures detected by the plurality of thermocouples of the temperature measuring unit is taken as the flue gas temperature of the temperature measuring unit.

[0160] It is worth noting that in order to more accurately reflect the sintering bellow flue gas temperature, so as to better determine the sintering end line, the temperature measuring unit in the embodiment adopts a multi-point thermocouple. Those skilled in the art can understand that the multi-point thermocouple is a commonly used temperature measuring element in industrial scenes, including a protective sleeve and a plurality of thermocouples installed in the protective sleeve. The thermocouple can accurately obtain the temperature of the position. By installing the protective sleeve on the sintering bellow in the width direction of the sintering machine trolley, that is, one temperature measuring unit can obtain the temperature distribution of one sintering cross section. After taking the arithmetic mean of the temperature values of the plurality of thermocouples of the same temperature measuring unit, the obtained temperature value is taken as the flue gas temperature of the temperature measuring unit. It can be understood that the flue gas temperature obtained by taking the average value can accurately reflect the corresponding flue gas temperature of the sintering bellow, so as to accurately obtain the corresponding sintering end line.

[0161] As another preferred embodiment, the step S4 further includes the step of:

[0162] S400, when the current sintering state is an abnormal state, obtaining sintering state information within a first time length after the current sintering state is the abnormal state, and determining whether the sintering state at a first time node at the end of the first time length is an abnormal state;

[0163] S401, when the sintering state at the first time node at the end of the first time length is an abnormal state, entering the step of "determining the first gas blowing flow calculation value corresponding to the adjustment of the actual sintering end line to the expected sintering end line in the current state according to the expected sintering end line and the pre-established position flow algorithm model";

[0164] S402, when the sintering state at the first time node at the end of the first time length is a normal state, returning to step S1.

[0165] It should be noted that, in order to maintain the stability of the equipment as much as possible in the actual production process, and avoid frequent adjustment, the embodiment obtains the sintering state information within a first time length after the current sintering state is an abnormal state, and judges whether the sintering state at a first time node at the end of the first time length is an abnormal state, that is, the sintering state at the first time node at the end of the first time length is still an abnormal state, which indicates that the current sintering state has a higher degree of authenticity, and then the step of determining the first gas injection flow calculation value corresponding to the adjustment of the actual sintering terminal line to the expected sintering terminal line is performed according to the expected sintering terminal line and the pre-established position-flow algorithm model; on the contrary, if the sintering state at the first time node at the end of the first time length is a normal state, it may be a slight fluctuation of the equipment, and at this time, no adjustment is made, and the step S1 is returned to continue to obtain data.

[0166] Further, the step S4 further includes a step of:

[0167] S500, when the current sintering state is a normal state, maintaining the current sintering state to continue production.

[0168] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation obtained by using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for sintering endpoint adjustment based on abnormality of flue gas temperature, characterized by, The method comprises the steps of: S1, obtaining the temperature of the flue gas of each temperature measuring unit; wherein, each sintering wind box is provided with a temperature measuring unit for detecting the temperature of the flue gas passing through the sintering material, and a plurality of temperature measuring units in the same sintering wind box are arranged along the length direction of the sintering pallet; S2, fitting the temperature curve of the flue gas of all temperature measuring units in sequence from the sintering machine head wheel to the sintering machine tail wheel to obtain the fitting curve of the flue gas of the sintering wind box; S3, judging whether the fitting curve of the flue gas of the sintering wind box has a curve inflection point, and when the fitting curve of the flue gas of the sintering wind box has a curve inflection point, obtaining the actual sintering end line in the current state according to the curve inflection point, and judging whether the current sintering state is an abnormal state according to the actual sintering end line; S4, when the current sintering state is an abnormal state, determining the first calculated value of the gas injection flow corresponding to the adjustment of the actual sintering end line in the current state to the expected sintering end line according to the expected sintering end line and a pre-established position-flow algorithm model; wherein, the position-flow algorithm model comprises the mapping relationship between the gas injection flow and the sintering end line; S5, when the first calculated value of the gas injection flow is within the effective flow adjustment range, adjusting the current gas injection flow to the first calculated value of the gas injection flow by adjusting the gas injection adjusting valve; The position-flow algorithm model in step S4 is specifically: Wherein, S is the sintering end line, Q is the theoretical calculated value of the required gas injection flow corresponding to the sintering end line S; H is the total thickness of the material layer on the sintering pallet, PH is the thickness of the bottom material layer, SV is the sintering pallet speed, c is the solid combustion zone thickness, k1 is the heat transfer coefficient, h is the gas combustion heat, t is the gas injection duration, m is the unit sintering machine material quantity, z is the material layer thickness below the gas combustion zone, and Cp is the average specific heat capacity of the sintering material.

2. The sintering endpoint adjustment method based on fume temperature anomaly according to claim 1, characterized by, The "judging whether the current sintering state is an abnormal state according to the actual sintering end line" in step S3 specifically comprises the following steps: S41, judging whether the actual sintering end line lags behind the expected sintering end line in the running direction of the sintering machine; when the actual sintering end line lags behind the expected sintering end line in the running direction of the sintering machine, steps S42-S43 are executed; when the actual sintering end line leads the expected sintering end line in the running direction of the sintering machine, step S44 is executed; S42, determining the lateral distance between the actual sintering end line and the expected sintering end line, and judging whether the lateral distance is greater than a preset threshold; S43, when the lateral distance is greater than the preset threshold, determining that the current sintering state is an over-sintering state; when the lateral distance is less than or equal to the preset threshold, determining that the current sintering state is a normal sintering state; S44, determining that the current sintering state is a normal sintering state.

3. The sintering endpoint adjustment method based on fume temperature anomaly according to claim 1, characterized by, The method further comprises the following steps after step S3: S31, when the sintering wind box flue gas fitting curve does not have a curve inflection point, determining that the current sintering state is an under-fired sintering state, and determining a second calculated gas injection flow value required for adjusting the actual sintering endpoint line in the under-fired state to the expected sintering endpoint line according to the expected sintering endpoint line and the position-flow algorithm model; S32, when the second calculated gas injection flow value is within the effective flow adjustment range, adjusting the gas injection adjustment valve to adjust the current gas injection flow to the second calculated gas injection flow value.

4. The sintering endpoint adjustment method based on fume temperature anomaly according to claim 1, wherein The step S3 of "obtaining the actual sintering endpoint line in the current state according to the curve inflection point" specifically comprises the following steps: Taking the position of the temperature measuring unit corresponding to the curve inflection point along the running direction of the sintering machine as the actual sintering endpoint line in the current state.

5. The sintering endpoint adjustment method based on fume temperature anomaly according to claim 1, characterized by, The step S4 of "determining a first calculated gas injection flow value corresponding to adjusting the actual sintering endpoint line in the current state to the expected sintering endpoint line according to the expected sintering endpoint line and the pre-established position-flow algorithm model" further comprises the following steps: S400, when the current sintering state is an abnormal state, obtaining sintering state information within a first time length after the current sintering state becomes the abnormal state, and determining whether the sintering state at a first time node at the end of the first time length is an abnormal state; S401, when the sintering state at the first time node at the end of the first time length is an abnormal state, entering the step of "determining a first calculated gas injection flow value corresponding to adjusting the actual sintering endpoint line in the current state to the expected sintering endpoint line according to the expected sintering endpoint line and the pre-established position-flow algorithm model"; S402, when the sintering state at the first time node at the end of the first time length is a normal state, returning to step S1.

6. The sintering endpoint adjustment method based on fume temperature anomaly according to claim 1, wherein The step S4 further comprises the following step: S500, when the current sintering state is a normal state, maintaining the current sintering state to continue production.

7. A sintering endpoint adjustment system based on fume temperature anomaly, characterized by, The sintering machine comprises a sintering machine body, a gas injection device, and a control system. The sintering machine body comprises a material distribution zone, an ignition furnace zone, and a holding furnace zone. A gas injection zone is arranged downstream of the holding furnace zone, and the gas injection zone is provided with the gas injection device. The sintering machine further comprises a plurality of sintering wind boxes arranged directly below the sintering pallets. Each sintering wind box is provided with a temperature measuring unit for detecting the temperature of the flue gas passing through the sintering material. The gas injection device comprises a gas injection main pipe and a plurality of gas injection branch pipes arranged side by side along the width direction of the sintering pallet. A gas adjustment valve is arranged on the gas injection main pipe. Each gas injection branch pipe is in communication with the gas injection main pipe, and the bottom of each gas injection branch pipe is provided with a plurality of gas injection nozzles for injecting gas towards the top surface of the sintering material layer. The sintering machine body further comprises a plurality of sintering wind boxes arranged directly below the sintering pallets. Each sintering wind box is provided with a temperature measuring unit for detecting the temperature of the flue gas passing through the sintering material. The plurality of temperature measuring units in the same sintering wind box are arranged in the length direction of the sintering pallet. The gas blowing device and the temperature measuring unit are connected with the control system, and the control system comprises a memory, a processor, a computer program stored in the memory and executable on the processor, and the processor executes the computer program to realize the steps of the method of the sintering endpoint adjustment method based on the abnormal temperature of flue gas according to any one of claims 1 to 6.

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