Method and system for determining sinter material state from machine tail cross section temperature

Abstract

This invention provides a method and system for determining the state of sintered materials based on the temperature of the tail section. The method acquires temperature distribution data of the bottom layer and the sintered material layer above it from a thermal imaging image of the effective tail section. Based on this temperature distribution data, the sintered material layer is divided into multiple temperature zones. If no temperature zone satisfies the temperature distribution of the sintering combustion zone, the average temperature of the bottom layer is determined based on its temperature distribution data. The method then determines whether the average temperature is within the desired temperature range. If so, the sintering is considered to be in an effective sintering state where the sintering area utilization rate is within the ideal control range; otherwise, it is considered to be in an over-sintered state or an under-sintered state. This application offers high detection accuracy and ensures maximum utilization of the sintering area when an effective sintering state is detected.

Description

Technical Field

[0001] This invention relates to the field of sintering technology, and in particular to a method and system for determining the state of sintered materials based on the temperature of the tail section. Background Technology

[0002] In steel production, iron-containing raw materials need to be processed by a sintering system before entering the blast furnace for smelting. This involves mixing various powdered iron-containing raw materials with appropriate amounts of fuel (coal powder, coke powder) and flux, adding an appropriate amount of water, mixing and pelletizing them, and then placing them on a sintering machine trolley for roasting. This causes a series of physicochemical changes to form easily smelted sintered ore. This process is called sintering.

[0003] In existing technologies, temperature curves are obtained by sequentially fitting the temperature data detected by all temperature sensors on the bellows branch pipes to obtain temperature curves (e.g., ...). Figure 5 As shown in the figure, the sintering endpoint is determined by the inflection point of the temperature curve to maintain the sintering state within a reasonable range. If the sintering endpoint is reached too early, the sintering area will not be fully utilized, resulting in low sintering efficiency; if the endpoint is reached too late, the sintering material cannot be completely sintered, leaving raw material at the bottom of the sintering machine trolley, which needs to be re-sintered, further reducing sintering efficiency.

[0004] However, existing methods for detecting the sintering endpoint suffer from sparse temperature sampling points due to the typical sintering windbox width of 4 meters and the typical sintering machine trolley width of 1.5 meters, resulting in some error compared to the actual sintering endpoint location. Furthermore, the method of obtaining the final endpoint location for guiding sintering production through quadratic function curve fitting cannot detect if the sintering endpoint falls within the sintering machine trolley area corresponding to the last windbox (the quadratic curve rises continuously without an inflection point). Existing solutions typically control the sintering endpoint to be located in the second-to-last or third-to-last windbox position to guide sintering production, which is not conducive to maximizing the utilization of the sintering machine area (e.g., ...). Figure 4 As shown, at least the sintering area of ​​the last two sintering machine trolleys is wasted.

[0005] Therefore, it is necessary to propose a method and system for determining the state of sintered materials based on the temperature of the tail section to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0006] The main objective of this invention is to provide a method and system for determining the state of sintered materials based on the temperature of the tail section, in order to solve the problems of low detection accuracy and inability to detect the curve inflection point in the existing technology. The sintering endpoint falls in the sintering machine trolley area corresponding to the last air box (the quadratic curve rises continuously without an inflection point), which makes it impossible to detect the effective sintering state with the maximum sintering area utilization.

[0007] To achieve the above objectives, the present invention provides a method for determining the state of sintered materials based on the temperature of the tail section, comprising the following steps:

[0008] S1, obtain the actual tail section thermal imaging image of the current sintering machine trolley, and extract the effective tail section thermal imaging image from the actual tail section thermal imaging image.

[0009] S2, obtain the temperature distribution data of the bottom material layer and the temperature distribution data of the sintering material layer above the bottom material layer from the effective tail section thermal imaging image, and divide the sintering material layer into multiple sintering material temperature zones with different temperature ranges according to the temperature distribution data of the sintering material layer.

[0010] S3, determine whether there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones; if there is no sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute steps S41~S42; if there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute step S43.

[0011] S41, determine the average temperature of the base material layer based on the temperature distribution data of the base material layer, and determine whether the average temperature is within the desired temperature range;

[0012] S42, when the average temperature is within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an effective sintering state with the sintering area utilization rate within the ideal control range; when the average temperature is not within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an over-sintering state.

[0013] S43, determine that the sintering material on the current sintering machine trolley is in an under-sintering state.

[0014] Preferably, the desired temperature range in step S41 is obtained through the following steps:

[0015] S411, determine the optimal sintering distance S0 corresponding to the maximum sintering area utilization rate of the sintering machine; wherein, the optimal sintering distance S0 is the distance difference between the optimal sintering endpoint and the sintering ignition position along the running direction of the sintering machine, and the optimal sintering endpoint corresponds to the tail position of the second to last sintering machine trolley.

[0016] S412, obtain the running speed SV of the sintering machine trolley during the stable production process, the total thickness H of the material layer on the sintering machine trolley, and the thickness PH of the bottom layer; wherein, the total thickness of the material layer includes the thickness PH of the bottom layer.

[0017] S413, determine the travel time ST of the sintering machine trolley from the sintering ignition position to the optimal sintering endpoint based on the optimal sintering distance S0 and the running speed SV;

[0018] S414, determine the ideal vertical combustion speed LV0 of the sintering material on the sintering machine trolley based on the total material layer thickness H, the bottom material layer thickness PH and the travel time ST;

[0019] S415, determine the sinter material cooling time LT1 and sinter ore cooling rate TV of the last sintering machine trolley located after the optimal sintering endpoint, and determine the temperature cooling amount of the last sintering machine trolley based on the cooling time LT1 and sinter ore cooling rate TV.

[0020] S416, determine the desired temperature range based on the temperature cooling amount.

[0021] Preferably, the sintered material layer is divided into four sintered material temperature zones with different temperature ranges based on the temperature distribution data of the sintered material layer, including a first sintered material temperature zone, a second sintered material temperature zone, a third sintered material temperature zone, and a fourth sintered material temperature zone; wherein,

[0022] The temperature of the first sintering material temperature zone is 900~1100℃, the temperature of the second sintering material temperature zone is 700~900℃, the temperature of the third sintering material temperature zone is 500~700℃, and the temperature of the fourth sintering material temperature zone is <500℃.

[0023] Preferably, the sinter cooling rate TV in step S415 is obtained through the following steps:

[0024] The average temperature T1 of the first sintering material temperature zone is determined based on the temperature distribution data of the first sintering material temperature zone; and the average temperature T0 of the bottom layer is determined based on the temperature distribution data of the bottom layer.

[0025] The horizontal isotherm H1 of the first sintering material temperature zone is determined based on the average temperature T1, and the horizontal isotherm H0 of the bottom layer is determined based on the average temperature T0.

[0026] Using formula The cooling rate TV of the sintered ore was determined.

[0027] Preferably, the desired temperature range is set to 1250-3. TV LT1 ~ 1250-Tv LT1.

[0028] Preferably, after determining that the sintering material of the current sintering machine trolley is in an over-sintering state when the average temperature is not within the desired temperature range, the step further includes the step of sending a first alarm command to the target object.

[0029] And / or step S43 may be followed by the step of sending a second alarm command to the target object.

[0030] Preferably, the desired temperature range is set to 800℃~1100℃.

[0031] This invention also provides a system for determining the state of sintered materials based on the temperature of the tail section, comprising a sintering machine body, a thermal imaging acquisition device, and a control system. The sintering machine body includes a material feeding area, an ignition furnace area, a holding furnace area, and multiple sintering machine trolleys; wherein,

[0032] The thermal imaging acquisition device is located on the outside of the tail wheel of the sintering machine body, and the thermal imaging acquisition device is used to acquire an effective tail section thermal imaging image of the sintering machine trolley.

[0033] The thermal imaging acquisition device is 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, it implements the steps of the method described above for determining the state of sintered material based on the tail section temperature.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This invention provides a method and system for determining the state of sintered materials based on the temperature of the tail section. The method involves acquiring a thermal imaging image of the actual tail section of the current sintering machine trolley, extracting a valid thermal imaging image of the tail section from the actual tail section, obtaining temperature distribution data of the bottom layer and the sintered material layer above the bottom layer from the valid thermal imaging image, and dividing the sintered material layer into multiple temperature zones based on the temperature distribution data of the sintered material layer. In all temperature zones, there is no sintered material that meets the temperature distribution requirements of the sintering combustion zone. During temperature zoning, the average temperature of the base material layer is determined based on its temperature distribution data. It is then assessed whether the average temperature falls within the desired temperature range. If the average temperature is within the desired range, the sintering material on the current sintering machine trolley is considered to be in an effective sintering state with sintering area utilization within the ideal control range. If the average temperature is not within the desired range, the sintering material on the current sintering machine trolley is considered to be in an over-sintered state. If, among all the sintering material temperature zones, there is a zone that satisfies the temperature distribution of the sintering combustion zone, the sintering material on the current sintering machine trolley is considered to be in an under-sintered state. This application offers high detection accuracy and ensures maximum utilization of the sintering area when an effective sintering state is detected. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a process flow diagram of a sintering system in the existing technology;

[0038] Figure 2 This is a schematic diagram of the sinter formation process in the prior art;

[0039] Figure 3 This is one of the schematic cross-sectional views of the sinter formation process in existing technologies;

[0040] Figure 4 This is the second cross-sectional schematic diagram of the sinter formation process in the existing technology;

[0041] Figure 5 A schematic diagram of the flue gas temperature curve of the wind box branch pipe in the prior art;

[0042] Figure 6 This is a schematic diagram of sintering state A in one embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of sintering state B in one embodiment of the present invention;

[0044] Figure 8 This is a schematic diagram of sintering state C in one embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram of a system according to an embodiment of the present invention;

[0046] Figure 10 This is a thermal imaging image of the tail section in one embodiment of the present invention;

[0047] Figure 11 This is a schematic diagram of the average temperature at different heights of the tail section in one embodiment of the present invention.

[0048] Figure 12 This is a schematic diagram of sinter cooling in one embodiment of the present invention;

[0049] Figure 13 This is a schematic flowchart of one embodiment of the present invention;

[0050] Figure 14 This is a schematic diagram of the process for obtaining the desired temperature range in one embodiment of the present invention.

[0051] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0055] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0056] To enable those skilled in the art to fully understand the technical solution of this application, it should be understood that existing sintering systems mainly include multiple pieces of equipment such as sintering machine trolleys, mixers, main exhaust fans, and annular coolers. See the sintering system process flow diagram for details. Figure 1 As shown: Various raw materials are proportioned in the batching room to form a mixture. This mixture is then fed into a mixer for homogenization and pelletizing. Next, it is evenly distributed onto the sintering machine trolley by a roller feeder and a nine-roller spreader to form a sintering mixture layer. The ignition fan and ignition blower start the ignition furnace, igniting the uppermost layer of the sintering mixture on the sintering machine trolley. The ignited combustion zone moves downwards, and the mixture passing through it is roasted into sintered ore. This is the sintering process. After sintering, the resulting sintered ore is crushed by a single-roller crusher and cooled by an annular cooler. Finally, it is screened and granulated before being sent to the blast furnace or finished ore bin. The oxygen required for the sintering process is provided by the main exhaust fan. Multiple vertically arranged air boxes are located below the sintering machine trolley, below which is a horizontally placed large flue (or duct). The large flue is connected to the main exhaust fan, which provides combustion air for the sintering process through the negative pressure air generated by the large flue and air boxes via the trolley.

[0057] Please refer to Figure 2-4 In existing sintering processes, the ignited combustion zone moves from top to bottom at a speed equal to the vertical sintering speed. The sintering machine trolley moves from the head to the tail of the sintering machine, and its speed is the machine speed. When the combustion zone reaches the bottom of the mixture on the sintering machine trolley (the bottom layer position), the corresponding position of the sintering machine trolley relative to the head of the sintering machine is the sintering endpoint. Figure 2 As shown, with the movement of the sintering machine trolley, the combustion zone gradually moves downwards, and the mixture passing through the combustion zone is roasted into sintered ore; as Figure 3 (As shown in the diagram at the top position of the combustion zone), during the sintering process, the material inside the sintering machine trolley can be divided into a bottom layer, a mixed layer, a combustion zone layer, and a sintered ore layer from bottom to top. The bottom layer consists of finished sintered ore of a certain particle size. For example... Figure 4As shown, when the combustion zone moves to the bottom material layer, all the material in the sintering machine trolley has been roasted into sinter. The corresponding position at this point is the sintering endpoint, usually indicated by the bellows number. Optionally, the combustion zone layer has a certain thickness. The sintering endpoint can be understood as the bottom of the combustion zone just touching the bottom material layer. Controlling the sintering endpoint position to the penultimate or penultimate bellows position prevents the generation of raw material, resulting in high fuel utilization, high sintering efficiency, and good sinter quality. In other words, the ideal sintering endpoint position can be considered as a point at a fixed distance from the ignition position on the sintering material surface.

[0058] Those skilled in the art should understand that when the sintering machine trolley moves to the end wheel of the sintering machine, as the unloading tilt angle of the sintering machine trolley increases, the sintered cake on the sintering machine trolley breaks, and the entire sintered ore on the sintering machine trolley slides into the next crushing and cooling process. A simplified diagram of the production state at the tail of the sintering machine is shown below. Figures 6 to 8 As shown: Among them, will Figure 6 The sintering production state shown is designated as state A. Figure 7 The sintering production state shown is designated as state B. Figure 8 The sintering production state shown is designated as state C.

[0059] Specifically, such as Figure 2 As shown, the width of the bellows of a typical sintering machine is 4 meters, and the length of the typical sintering machine trolley is 1.5 meters (both dimensions are along the running direction of the sintering machine trolley).

[0060] like Figure 6 Under the sintering production state A shown, if the traditional method of arranging thermocouples in the wind box branch pipe is used to detect the sintering endpoint, the inflection point of the quadratic function cannot be found (the temperature of the wind box branch pipe is constantly rising, that is, the traditional method cannot detect the sintering endpoint); the actual sintering endpoint is located at the tail of the sintering machine, that is, the material in the last sintering machine trolley still contains the combustion zone and the mixed raw material below the combustion zone. As the sintering machine trolley continues to move forward, the material in the combustion zone and a small amount of mixed material (raw material) will enter the next crushing and cooling process, which will lead to an increase in the return ore in the sintering production, which is not conducive to the production results;

[0061] like Figure 7 Under the sintering production state B shown, if the traditional method of arranging thermocouples in the wind box branch pipe is used to detect the sintering endpoint, the inflection point of the quadratic function cannot be found (the temperature of the wind box branch pipe keeps rising, and the traditional method cannot detect the sintering endpoint); the sintering endpoint falls at the end of the second to last sintering machine trolley, and the last sintering machine trolley is full of sintered ore. The sintered ore enters the cooling state on the last trolley. As the sintering machine trolley continues to move forward, all the ore entering the next crushing and cooling process is sintered ore. At this time, the sintering area utilization rate is the highest.

[0062] like Figure 8In the sintering production state C shown, if the traditional method of arranging thermocouples in the wind box branch pipe is used to detect the sintering endpoint, the inflection point of the quadratic function can be found (the temperature of the wind box branch pipe forms an inflection point in the penultimate wind box). The sintering endpoint falls at the position of the fourth to last sintering machine trolley. The sintered ore on the last three sintering machine trolleys enters the cooling state. The effective area of ​​the sintering machine is wasted by the sintering area of ​​the last two sintering machine trolleys. Based on a typical sintering machine length of 90 meters, production state B has a sintering production area of ​​3 meters longer than production state C, which is the length of two sintering machine trolleys (each 1.5m long). Production state B improves the sintering area utilization rate by about 3.3% compared to production state C.

[0063] In summary, production state B is the ideal sintering production state. However, using the existing technology of detecting the sintering endpoint position by the temperature of the wind box branch pipe to guide sintering production makes it difficult to control the sintering machine to continue production under production state B. Therefore, the existing technology of using thermocouples arranged in the wind box branch pipe to predict the sintering endpoint to control the sintering state of the sintering machine cannot keep the sintering area ratio in a highly efficient state.

[0064] Please see the appendix Figure 13-14 This invention provides a method for determining the state of sintered materials based on the temperature of the tail section, comprising the following steps:

[0065] S1. Obtain the actual tail section thermal imaging image of the current sintering machine trolley and extract the effective tail section thermal imaging image from the actual tail section thermal imaging image. Specifically, a thermal imaging camera can be set at a suitable position at the tail of the sintering machine (outside the tail wheel of the sintering machine). The thermal imaging camera can obtain the actual tail section thermal imaging image of the current sintering machine trolley. The image data processing unit can extract the effective tail section thermal imaging image from the actual tail section thermal imaging image. The effective tail section thermal imaging image can ensure that a complete tail sintering cake section thermal imaging image is obtained, while removing image information of redundant parts other than the sintering section.

[0066] S2, obtain the temperature distribution data of the bottom material layer and the temperature distribution data of the sintering material layer above the bottom material layer from the effective tail section thermal imaging image, and divide the sintering material layer into multiple sintering material temperature zones with different temperature ranges according to the temperature distribution data of the sintering material layer; it is understood that, with the position of the thermal imaging camera kept fixed, and in the actual capture of the actual tail section thermal imaging image to ensure the acquisition of a complete tail sintering cake cross section thermal imaging image, the actual position of the cross section of the sintering machine trolley reflected in the image remains unchanged, so the area of ​​the bottom material layer and the area of ​​the sintering material above the bottom material layer can be quickly determined from the image, thereby obtaining the temperature distribution data of the bottom material layer and the temperature distribution data of the sintering material layer.

[0067] S3, determine whether there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones; if there is no sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute steps S41~S42; if there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute step S43.

[0068] S41, determine the average temperature of the bottom material layer based on the temperature distribution data of the bottom material layer, and determine whether the average temperature is within the desired temperature range; specifically, when there is no sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, the sintering endpoint is before the tail of the sintering machine, that is, the material on the sintering machine trolley between the sintering endpoint and the tail of the machine is in a cooling state. By analyzing whether the average temperature of the bottom material layer is within the desired temperature range, it can be determined whether the current sintering state is in an over-burning state or an effective sintering state.

[0069] S42, when the average temperature is within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an effective sintering state with the sintering area utilization rate within the ideal control range; when the average temperature is not within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an over-sintering state.

[0070] S43, it is determined that the sintering material on the current sintering machine trolley is in an under-sintered state. Specifically, when there is a sintering material temperature zone that meets the temperature distribution of the sintering combustion zone among all sintering material temperature zones, the sintering endpoint is after the tail of the sintering machine. As the sintering machine trolley continues to move forward, the combustion zone material and a small amount of mixed material (raw material) will enter the next crushing and cooling process. This will lead to an increase in the return ore in sintering production, which is not conducive to the production results.

[0071] In a preferred embodiment, the desired temperature range in step S41 is obtained through the following steps:

[0072] S411, determine the optimal sintering distance S0 corresponding to the maximum sintering area utilization rate of the sintering machine; wherein, the optimal sintering distance S0 is the distance difference between the optimal sintering endpoint and the sintering ignition position along the running direction of the sintering machine, and the optimal sintering endpoint corresponds to the tail position of the second-to-last sintering machine trolley; it is worth noting that the optimal sintering endpoint falls at the end of the second-to-last sintering machine trolley, the last sintering machine trolley is full of sintered ore, the sintered ore enters the cooling state on the last trolley, as the sintering machine trolley continues to move forward, all the ore entering the next crushing and cooling process is sintered ore, at this time the sintering area utilization rate is the highest;

[0073] S412, obtain the running speed SV of the sintering machine trolley during the stable production process, the total thickness H of the material layer on the sintering machine trolley, and the thickness PH of the bottom layer; wherein, the total thickness of the material layer includes the thickness PH of the bottom layer.

[0074] S413, determine the travel time ST of the sintering machine trolley from the sintering ignition position to the optimal sintering endpoint based on the optimal sintering distance S0 and the running speed SV;

[0075] S414, determine the ideal vertical combustion speed LV0 of the sintering material on the sintering machine trolley based on the total material layer thickness H, the bottom material layer thickness PH and the travel time ST;

[0076] S415, determine the sinter material cooling time LT1 and sinter ore cooling rate TV of the last sintering machine trolley located after the optimal sintering endpoint, and determine the temperature cooling amount of the last sintering machine trolley based on the cooling time LT1 and sinter ore cooling rate TV.

[0077] The specific cooldown time LT1 is as follows: Where: WT: Trolley width, in meters;

[0078] LT1: Cooling time, in seconds; SV: Sintering machine trolley speed, in m / s;

[0079] S416, determine the desired temperature range based on the temperature cooling amount.

[0080] After the sinter is formed, the air passing through the material surface of the sintering machine trolley will carry away the heat from the sinter and cool it, as shown in the schematic diagram. Figure 12 As shown:

[0081] like Figure 2 As shown, the speed at which the combustion zone moves downward is called the sintering speed, denoted by LV, in m / s; the thickness of the material layer on the sintering machine trolley is denoted by H, in m; there is a bottom layer material under the sintering mixture, which is finished sintered ore of a certain particle size, and its thickness can be denoted by PH, in m; during the stable production process of sintering, the operating speed of the sintering machine can be approximated as a constant value.

[0082] like Figure 2 As shown, the sintering time ST (in seconds) is the time taken after the sintered ore passes through the ignition furnace and begins the sintering process.

[0083] Formula 1

[0084] Controlling the sintering endpoint is an important means of sintering control. During the sintering process, after the mixture is laid on the sintering machine trolley, controlling the sintering endpoint at the last or second-to-last air box of the sintering machine can achieve the most reasonable use of the sintering machine area. That is, the ideal sintering endpoint position can be regarded as a point at a fixed distance from the ignition position of the sintering material surface; that is, the moving distance S of the trolley after the ignition of the sintering material surface has an optimal value S0, and the position corresponding to S0 is the sintering endpoint position.

[0085] like Figure 2 As shown in Formula 2, the relationship between the sintering machine trolley travel distance S (unit: m), the sintering machine trolley speed SV (unit: m / s), and the sintering time ST within the sintering time ST is:

[0086] Formula 2

[0087] Combining formulas 1 and 2, we can obtain formula 3:

[0088] Formula 3

[0089] Formula 3 can be transformed to obtain Formula 4:

[0090] Formula 4

[0091] Substituting the optimal sintering endpoint S0 position into Equation 4, we obtain Equation 5:

[0092] Formula 5

[0093] Where LV0 is the ideal vertical combustion velocity; the total thickness of the material layer H and the thickness of the bottom material layer PH are constants; SV can be obtained from the computer system; and S0 is a constant related to the parameters of the sintering machine. For example, for a 90-meter-long sintering machine, the optimal sintering position is the 88.5-meter position from the head, and the ignition position is the 5-meter position, then S0 = 83.5 meters.

[0094] like Figure 11 As shown, the thermal imaging data processing unit provides average temperature distribution maps at different altitudes; specifically:

[0095] State A: T0>T1>T2>T3, and T0>1100℃, indicating that there is a combustion zone at the bottom of the tail section;

[0096] State B: T0>T1>T2>T3, and T0<1100℃, the tail section is determined to be a fully sintered ore;

[0097] C Status: T0 <t1>Since T2 > T3, it is determined that a combustion zone exists at line T1.

[0098] As a specific example, such as Figure 10 As shown, based on the temperature distribution data of the sintered material layer, the sintered material layer is divided into four sintered material temperature zones with different temperature ranges, including a first sintered material temperature zone, a second sintered material temperature zone, a third sintered material temperature zone, and a fourth sintered material temperature zone; wherein,

[0099] The temperature of the first sintering material temperature zone is 900~1100℃, the temperature of the second sintering material temperature zone is 700~900℃, the temperature of the third sintering material temperature zone is 500~700℃, and the temperature of the fourth sintering material temperature zone is <500℃.

[0100] It should be noted that if the sintering endpoint does not fall to the tail of the sintering machine, the temperature of each sintering material temperature zone will not exceed the sintering endpoint temperature of 1250℃ (corresponding to the temperature of the combustion zone).

[0101] like Figure 10 As shown, if the sintering endpoint falls to the tail of the sintering machine, a temperature zone of 1250℃ will appear. For example, if the temperature of temperature zone 2 is 1250℃, then temperature zone 2 corresponds to the sintering combustion zone, temperature zone 1 corresponds to the mixed material, and temperature zones 3 and 4 correspond to the sintered ore.

[0102] Furthermore, on Figure 10 By processing, the average temperature at different heights can be obtained, as shown in Figure 11: the average temperature value corresponding to height H0 is T0, where H0 is the position where the sintering material layer contacts the bottom material, which is ~20mm above the bottom of the sintering machine trolley; the average temperature value corresponding to height H1 is T1, the average temperature value corresponding to height H2 is T2, and the average temperature value corresponding to height H3 is T3. The height difference between each mark can be 0.02m~0.1m; (more marks can be used, and those skilled in the art can set them according to actual needs).

[0103] Furthermore, the sinter cooling rate TV in step S415 is specifically obtained through the following steps:

[0104] The average temperature T1 of the first sintering material temperature zone is determined based on the temperature distribution data of the first sintering material temperature zone, in °C; and the average temperature T0 of the bottom layer is determined based on the temperature distribution data of the bottom layer, in °C.

[0105] The horizontal isotherm H1 of the first sintering material temperature zone is determined based on the average temperature T1, in meters, and the horizontal isotherm H0 of the bottom layer is determined based on the average temperature T0, in meters.

[0106] Using formula The cooling rate TV of the sinter was determined in °C / s.

[0107] It is worth noting that after the sinter is formed, the air passing through the material surface of the sintering machine trolley will carry away the heat from the sinter and cool it, as shown in the schematic diagram. Figure 9 As shown, the sinter cooling rate TV can reflect the amount of cooling drop of the sinter per unit time. In this application, the sinter cooling rate TV can be determined by the temperature drop range T0-T1 between the horizontal isotherm H0 and horizontal isotherm H1 at the tail section of the sintering machine and the ideal vertical combustion rate LV0.

[0108] As a preferred example, the desired temperature range is set to 1250-3. TV LT1 ~ 1250-Tv LT1. This embodiment considers variations in the production process and controls the sintering endpoint to fall between the second-to-last and fourth-to-last sintering machine trolleys, which constitutes a highly efficient utilization area for the sintering machine trolley's sintering area. Therefore, the desired temperature range can be set to 1250-3... TV LT1 ~ 1250-Tv LT1.

[0109] Furthermore, the desired temperature range is set to 800℃~1100℃. For example, if the operating speed of a sintering machine is 2m / min, the calculated cooling rate of the sinter is 200℃ / min, and the length of the sintering machine trolley is 1.5m, then the cooling temperature of a single sintering machine trolley over its travel time is 150℃; according to the desired temperature range set to 1250-3... TV LT1~ 1250-Tv Substituting LT1, we can obtain the control temperature range of the horizontal isotherm H0 at the tail section of the sintering machine as 800℃~1100℃. Therefore, as long as the average temperature T0 corresponding to the horizontal isotherm H0 is within this range, it can be determined that the sintering material of the current sintering machine trolley is in an effective sintering state where the sintering area utilization rate is within the ideal control range. The corresponding sintering endpoint falls between the second to last sintering machine trolley and the fourth to last sintering machine trolley. Within this range, the sintering area utilization rate is high, and the sintering economy is high.

[0110] As another preferred embodiment, after determining that the sintering material of the current sintering machine trolley is in an over-sintering state when the average temperature is not within the desired temperature range, the step further includes the step of sending a first alarm command to the target object; and / or after step S43, the step further includes the step of sending a second alarm command to the target object.

[0111] It is understandable that when the sintering material on the current sintering machine trolley is in an over-burned state, the production capacity of the sintering machine (e.g., the sintering area corresponding to the last few blowers starting from the actual combustion endpoint) is not fully utilized, resulting in a reduction in sinter output / capacity. In this situation, a first alarm command can be sent to the target (e.g., the back-end control center or staff). The first alarm command includes, but is not limited to, sending a voice prompt indicating over-burning to the target, issuing an alarm command, sending a message to the server or target account, or cutting off the power to the sintering machine system, or one or more of the following:

[0112] Similarly, if it is determined that the sintering material on the current sintering machine trolley is in an under-sintering state, this indicates that the mixture on the sintering machine trolley has reached the tail end of the machine for unloading before it has had time to be fully roasted. At this time, there is still a lot of raw material between the combustion zone and the bottom layer corresponding to the actual sintering endpoint, resulting in under-sintering and ultimately affecting the quality of the sintered ore. In this situation, a second alarm command can be sent to the target (e.g., the back-end control center or staff). The second alarm command includes, but is not limited to, sending a voice prompt indicating under-sintering, issuing an alarm command, sending a message to the server or target account, or cutting off the power to the sintering machine system—one or more of these methods.

[0113] This invention also provides a system for determining the state of sintered materials based on the temperature of the tail section, comprising a sintering machine body, a thermal imaging acquisition device, and a control system. The sintering machine body includes a material feeding area, an ignition furnace area, a holding furnace area, and multiple sintering machine trolleys; wherein,

[0114] The thermal imaging acquisition device is located on the outside of the tail wheel of the sintering machine body, and the thermal imaging acquisition device is used to acquire an effective tail section thermal imaging image of the sintering machine trolley.

[0115] The thermal imaging acquisition device is 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, it implements the steps of the method described above for determining the state of sintered material based on the tail section temperature.

[0116] Specifically, such as Figure 9 As shown, a thermal imaging camera can be installed at a suitable position at the tail of the sintering machine (outside the tail wheel of the sintering machine), and an image data processing unit can be installed to exchange data with the thermal imaging camera and the sintering computer control system. Furthermore, the timing of the thermal imaging camera's shooting can be set by detecting the tilt angle of the unloading and overturning of the sintering machine trolley and the vibration of the sintering cake falling, so as to ensure that a complete thermal imaging image of the sintering cake cross-section at the tail can be obtained. Alternatively, a thermal imaging video device can be installed at a suitable position at the tail of the sintering machine to obtain continuous video images of the tail working, and the thermal imaging image of the tail cross-section can be extracted from the video images. All of these methods are possible, and those skilled in the art can choose according to actual needs.

[0117] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for determining the state of sintered material based on the temperature of the tail section, characterized in that, Including the following steps: S1, obtain the actual tail section thermal imaging image of the current sintering machine trolley, and extract the effective tail section thermal imaging image from the actual tail section thermal imaging image. S2, obtain the temperature distribution data of the bottom material layer and the temperature distribution data of the sintering material layer above the bottom material layer from the effective tail section thermal imaging image, and divide the sintering material layer into multiple sintering material temperature zones with different temperature ranges according to the temperature distribution data of the sintering material layer. S3, determine whether there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones; if there is no sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute steps S41~S42; if there is a sintering material temperature zone that satisfies the temperature distribution of the sintering combustion zone among all sintering material temperature zones, execute step S43. S41, determine the average temperature of the base material layer based on the temperature distribution data of the base material layer, and determine whether the average temperature is within the desired temperature range; S42, when the average temperature is within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an effective sintering state with the sintering area utilization rate within the ideal control range; when the average temperature is not within the desired temperature range, it is determined that the sintering material of the current sintering machine trolley is in an over-sintering state. S43, determine that the sintering material of the current sintering machine trolley is in an under-sintering state; The desired temperature range in step S41 is obtained through the following steps: S411, determine the optimal sintering distance S0 corresponding to the maximum sintering area utilization rate of the sintering machine; wherein, the optimal sintering distance S0 is the distance difference between the optimal sintering endpoint and the sintering ignition position along the running direction of the sintering machine, and the optimal sintering endpoint corresponds to the tail position of the second to last sintering machine trolley. S412, obtain the running speed SV of the sintering machine trolley during the stable production process, the total thickness H of the material layer on the sintering machine trolley, and the thickness PH of the bottom layer; wherein, the total thickness of the material layer includes the thickness PH of the bottom layer. S413, determine the travel time ST of the sintering machine trolley from the sintering ignition position to the optimal sintering endpoint based on the optimal sintering distance S0 and the running speed SV; S414, determine the ideal vertical combustion speed LV0 of the sintering material on the sintering machine trolley based on the total material layer thickness H, the bottom material layer thickness PH and the travel time ST; S415, determine the sinter material cooling time LT1 and sinter ore cooling rate TV of the last sintering machine trolley located after the optimal sintering endpoint, and determine the temperature cooling amount of the last sintering machine trolley based on the cooling time LT1 and sinter ore cooling rate TV. S416, determine the desired temperature range based on the temperature cooling amount.

2. The method for determining the state of sintered material based on the tail section temperature according to claim 1, characterized in that, Based on the temperature distribution data of the sintered material layer, the sintered material layer is divided into four sintered material temperature zones with different temperature ranges, including a first sintered material temperature zone, a second sintered material temperature zone, a third sintered material temperature zone, and a fourth sintered material temperature zone; wherein... The temperature of the first sintering material temperature zone is 900~1100℃, the temperature of the second sintering material temperature zone is 700~900℃, the temperature of the third sintering material temperature zone is 500~700℃, and the temperature of the fourth sintering material temperature zone is <500℃.

3. The method for determining the state of sintered material based on the tail section temperature according to claim 2, characterized in that, The sinter cooling rate TV in step S415 is obtained through the following steps: The average temperature T1 of the first sintering material temperature zone is determined based on the temperature distribution data of the first sintering material temperature zone; and the average temperature T0 of the bottom layer is determined based on the temperature distribution data of the bottom layer. The horizontal isotherm H1 of the first sintering material temperature zone is determined based on the average temperature T1, and the horizontal isotherm H0 of the bottom layer is determined based on the average temperature T0. Using formula The cooling rate TV of the sintered ore was determined.

4. The method for determining the state of sintered material based on the tail section temperature according to claim 1, characterized in that, The desired temperature range is set to 1250-3. TV LT1 ~ 1250-Tv LT1.

5. The method for determining the state of sintered material based on the tail section temperature according to claim 1, characterized in that, The step of determining that the sintering material of the current sintering machine trolley is in an over-sintering state when the average temperature is not within the expected temperature range also includes the step of sending a first alarm command to the target object. And / or step S43 may be followed by the step of sending a second alarm command to the target object.

6. The method for determining the state of sintered material based on the tail section temperature according to claim 1, characterized in that, The desired temperature range is set to 800℃~1100℃.

7. A system for determining the state of sintered materials based on the temperature of the tail section, characterized in that, The system includes a sintering machine body, a thermal imaging acquisition device, and a control system. The sintering machine body includes a material feeding area, an ignition furnace area, a holding furnace area, and multiple sintering machine trolleys. The thermal imaging acquisition device is located on the outside of the tail wheel of the sintering machine body, and the thermal imaging acquisition device is used to acquire an effective tail section thermal imaging image of the sintering machine trolley. The thermal imaging acquisition device is 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, it implements the steps of the method for determining the state of sintered material based on the tail section temperature as described in any one of claims 1 to 6.

Images