Method for judging and regulating thickness of blast furnace protective slag skin

Abstract

The application discloses a judgment method and a regulation method for thickness of a blast furnace protective slag skin, and the judgment method comprises the following steps: partitioning a blast furnace top charging surface to obtain at least two fan-shaped partitions; determining whether an abnormal fan-shaped partition of the thickness of the protective slag skin appears according to a charging surface falling distance of each fan-shaped partition within a preset time period; the preset time period comprises a time period from the end of previous charging to the beginning of subsequent charging in at least two adjacent times of charging; and determining the maximum thickness of the slag skin of the abnormal fan-shaped partition according to temperature changes of different positions in the abnormal fan-shaped partition before and after at least one time of charging. The judgment method for the thickness of the blast furnace protective slag skin can realize real-time monitoring of thickness changes of the protective slag skin, quickly locates an abnormal area of the thickness of the protective slag skin, and determines the thickness of the slag skin through temperature change rates of different positions of the charging surface, thereby improving the accuracy of the judgment of the thickness of the protective slag skin.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of blast furnace protection, in particular to a method for judging and regulating the thickness of protective slag skin of a blast furnace. BACKGROUND

[0002] A protective slag skin is formed on the inner wall of a blast furnace, which can effectively protect the service life of the furnace wall and ensure safe operation. Without the protection of the slag skin, the carbon bricks on the inner side of the furnace wall will soon be washed away, and the high-temperature furnace charge will directly contact the cooling wall, causing the cooling wall to be rapidly and extensively damaged, which greatly threatens the safety of blast furnace production. However, when the protective slag skin is too thick, it is easy to cause the furnace wall to be scaled and form slag nodules. At the same time, under the action of the flow of gas in the furnace and the movement of the furnace charge, the protective slag skin is easy to fall off, which can cause abnormal quality of molten iron, changes in gas flow, and damage to the cooling wall of the blast furnace.

[0003] In the prior art, the thickness of the protective slag skin is judged according to the temperature of the cooling wall, and the protective slag skin is adjusted by adjusting the edge gas flow.

[0004] However, the method for judging the thickness of the protective slag skin in the prior art relies on the experience of the operator, and the accuracy is low. Moreover, the existing method for regulating the thickness of the slag skin is easy to cause excessive shedding of the slag skin, which can cause damage to the furnace wall. SUMMARY

[0005] The present application provides a method for judging and regulating the thickness of the protective slag skin of a blast furnace, so as to improve the accuracy of judging the thickness of the protective slag skin and protect the furnace wall of the blast furnace.

[0006] According to a first aspect of the present application, a method for judging the thickness of the protective slag skin of a blast furnace is provided, which comprises:

[0007] partitioning the furnace top charge surface to obtain at least two fan-shaped partitions;

[0008] determining whether an abnormal fan-shaped partition of the protective slag skin thickness appears according to the distance of the charge surface falling in each of the fan-shaped partitions within a preset time period; wherein the preset time period includes a time period from the end of the previous charging to the beginning of the subsequent charging in at least two adjacent charging processes;

[0009] if the abnormal fan-shaped partition appears, determining the maximum thickness of the protective slag skin corresponding to the abnormal fan-shaped partition according to the temperature change of different positions in the abnormal fan-shaped partition before and after at least one charging.

[0010] Optionally, the partitioning of the furnace top charge surface to obtain at least two fan-shaped partitions comprises:

[0011] selecting a starting point of the circular surface of the furnace top charge surface;

[0012] Starting from the starting point of the circular top surface, the top surface is divided into at least two sectors by a first division angle with the center of the top surface as the center.

[0013] The first division angle is negatively correlated with the radius of the top surface.

[0014] Optionally, the determination of the sector with abnormal thickness of the protective slag skin includes:

[0015] The preset time period includes a period from the end of the previous feeding to the start of the subsequent feeding in each adjacent feeding.

[0016] In the preset time period, the distance of the top surface is detected in each sector during at least two feedings, and the first average value of the distance of the top surface is calculated.

[0017] The sector corresponding to the minimum first average value in each sector is determined as the abnormal sector.

[0018] Optionally, the determination of the sector with abnormal thickness of the protective slag skin includes:

[0019] In each sector, each sector is divided into at least an edge area and a center area according to the distance range from the center of the top surface, and the edge area is away from the center.

[0020] The preset time period includes a period from the end of the previous feeding to the start of the subsequent feeding in each adjacent feeding.

[0021] In the preset time period, the distance of the top surface is detected in each sector during at least two feedings, and the first average value of the distance of the top surface is calculated.

[0022] The sector corresponding to the minimum first average value in each sector is determined as the abnormal sector.

[0023] Optionally, according to the temperature change of different positions in the abnormal sector before and after at least one feeding, the maximum thickness of the protective slag skin corresponding to the abnormal sector is determined.

[0024] obtaining the temperature of each sampling point from the edge to the center of the abnormal sector before the first charging, and determining a first temperature distribution map corresponding to the abnormal sector before the charging;

[0025] obtaining the temperature of each sampling point from the edge to the center of the abnormal sector after the first charging, and determining a second temperature distribution map corresponding to the abnormal sector after the charging;

[0026] determining the temperature change map according to the first temperature distribution map and the second temperature distribution map;

[0027] determining the inflection point of the temperature change of the abnormal sector according to the temperature change map, the temperature change slopes before and after the inflection point being different;

[0028] determining the position of the inflection point as the position of the vertex of the protective slag skin to determine the maximum thickness of the protective slag skin.

[0029] According to a second aspect of the present application, a method for controlling the thickness of the protective slag skin of a blast furnace is provided, the method comprising:

[0030] controlling the thickness of the protective slag skin according to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector is located; wherein the preset thickness interval includes at least two, and different preset thickness intervals correspond to different control methods;

[0031] wherein the maximum thickness of the protective slag skin in the abnormal sector is determined according to the method for determining the thickness of the protective slag skin of the blast furnace of claims 1-5.

[0032] Optionally, the controlling the thickness of the protective slag skin according to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector is located comprises:

[0033] when the thickness of the protective slag skin in the abnormal sector is within the first preset thickness interval, adjusting the blast furnace top distribution system from the current first distribution system to the second distribution system, and adopting the loose edge airflow mode to adjust the airflow distribution;

[0034] wherein the second distribution system reduces the amount of ore distribution in the outermost circle or increases the amount of coke in the outermost circle compared to the first distribution system;

[0035] monitoring the temperature of the abnormal sector and the moving distance of the material surface, and when the temperature of the abnormal sector is greater than the first temperature threshold and the moving distance of the material surface is greater than the first distance threshold, adjusting the second distribution system back to the first distribution system.

[0036] Optionally, the controlling the thickness of the protective slag skin according to the interval in which the maximum thickness of the protective slag skin in the abnormal sector is located further comprises:

[0037] when the abnormal sector's protective slag skin thickness is in the second preset thickness interval, adjusting the current first burdening system or the second burdening system to a third burdening system, the third burdening system adjusting the outermost circle ore burdening weight level and increasing the outermost circle coke weight compared with the first burdening system or the second burdening system;

[0038] monitoring the abnormal sector's temperature and the material surface moving distance, when the abnormal sector's temperature is greater than a second temperature threshold value and the material surface moving distance is greater than a second distance threshold value, changing to the second burdening system;

[0039] wherein the minimum value of the second preset thickness interval is greater than or equal to the maximum value of the first preset thickness interval.

[0040] Optionally, the adjusting the protective slag skin thickness according to the interval in which the maximum thickness of the protective slag skin in the abnormal sector is located further comprises:

[0041] when the abnormal sector's protective slag skin thickness is in the third preset thickness interval, adjusting the current burdening system to a fourth burdening system, the fourth burdening system comprising: continuing to use the third burdening system, while adding a first weight of dolomite to the outermost circle of ore, and the dolomite feeding period is a second period;

[0042] monitoring the abnormal sector's temperature and the material surface moving distance, when the abnormal sector's temperature is greater than a third temperature threshold value and the material surface moving distance is greater than a third distance threshold value, changing to the third burdening system;

[0043] wherein the minimum value of the third preset thickness interval is greater than or equal to the maximum value of the second preset thickness interval.

[0044] Optionally, when the abnormal sector's protective slag skin thickness is in a fourth preset thickness interval, adjusting the current burdening system to a fifth burdening system, the fifth burdening system comprising:

[0045] adjusting the lower tuyere to increase the edge gas flow by shortening the length of the lower tuyere corresponding to the abnormal sector, thereby flushing the slag skin of the furnace wall and shortening the tuyere length;

[0046] monitoring the abnormal sector's temperature and the material surface moving distance, when the abnormal sector's temperature is greater than a fourth temperature threshold value and the material surface moving distance is greater than a fourth distance threshold value, changing to the fourth burdening system;

[0047] wherein the minimum value of the fourth preset thickness interval is greater than or equal to the maximum value of the third preset thickness interval.

[0048] The application discloses a judgment method and a regulation method for the thickness of a blast furnace protective slag skin.

[0049] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0051] Figure 1 is a schematic diagram of a blast furnace wall section;

[0052] Figure 2 is a flowchart of a judgment method for the thickness of a protective slag skin provided by the first embodiment of the application;

[0053] Figure 3 is a structural schematic diagram of a blast furnace top material surface provided by the first embodiment of the application;

[0054] Figure 4 is a flowchart of another judgment method for the thickness of a blast furnace protective slag skin provided by the first embodiment of the application;

[0055] Figure 5 is another structural schematic diagram of a blast furnace top material surface provided by the first embodiment of the application;

[0056] Figure 6 is a flowchart of another judgment method for the thickness of a blast furnace protective slag skin provided by the first embodiment of the application;

[0057] Figure 7 is a schematic diagram of a blast furnace section structure provided by the first embodiment of the application;

[0058] Figure 8is a flow chart of another judgment method of the thickness of the protective slag skin of the blast furnace provided by the embodiment one of the present application;

[0059] Figure 9 is another schematic diagram of the top charging surface of the blast furnace provided by the embodiment one of the present application;

[0060] Figure 10 is a flow chart of another judgment method of the thickness of the protective slag skin of the blast furnace provided by the embodiment one of the present application;

[0061] Figure 11 is a flow chart of a method for regulating the thickness of the protective slag skin of the blast furnace provided by the embodiment two of the present application;

[0062] Figure 12 is a flow chart of another method for regulating the thickness of the protective slag skin of the blast furnace provided by the embodiment two of the present application;

[0063] Figure 13 is a flow chart of another method for regulating the thickness of the protective slag skin of the blast furnace provided by the embodiment two of the present application;

[0064] Figure 14 is a flow chart of another method for regulating the thickness of the protective slag skin of the blast furnace provided by the embodiment two of the present application;

[0065] Figure 15 is a flow chart of another method for regulating the thickness of the protective slag skin of the blast furnace provided by the embodiment two of the present application. DETAILED DESCRIPTION

[0066] In order to make the personnel in the art better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0067] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0068] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be performed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0069] Figure 1 is a schematic diagram of the cross section of the blast furnace wall, as shown in Figure 1 including: protective slag skin 111, furnace wall brick 112, cooling wall 113 and filler layer 114. In the blast furnace, the soft molten charge is moving downward, the tuyere blows high temperature hot air from bottom to top, and the blast furnace wall bears huge thermal stress and friction. Therefore, in the actual production process, the inner side of the furnace wall brick 112 generates the protective slag skin 111 to protect the furnace wall brick 112, if there is no protection of the protective slag skin 111, the furnace charge directly contacts the furnace wall brick 112, the furnace wall brick 112 may be washed away by the furnace charge, and the high temperature furnace charge will contact the cooling wall 113 and the filler layer 114, causing the cooling wall 113 to be burned in a large area, affecting the safety of production. If the protective slag skin 111 is too thick, the protective slag skin is easy to cause the furnace wall to scale at the place where the protective slag skin is too thick; at the same time, under the condition of the movement of the blast furnace gas and the furnace charge, the protective slag skin is easy to fall off instantaneously, resulting in abnormal quality of the blast furnace molten iron.

[0070] In the prior art, the thickness of the protective slag skin 111 is mainly controlled by judging according to the temperature of the cooling wall 113, when the temperature of the cooling wall 113 in a certain area is lower, the furnace charge is likely to be far away from the wall, which means that the protective slag skin is thicker. When the thickness of the protective slag skin 111 is judged by this method, when the blast furnace shaft is frequently gassed, the cooling wall 113 is generally hot, so it is not possible to judge the thickness of the protective slag skin 111.

[0071] Embodiment one

[0072] Figure 2 is a method for judging the thickness of the protective slag skin provided by the embodiment one of the present application, as shown in Figure 2 the protective slag skin thickness judgment method, comprising:

[0073] S101, the blast furnace top charge surface is divided into at least two sectors.

[0074] Figure 3 is a structure diagram of the blast furnace top charge surface provided by the embodiment one of the present application. As shown in Figure 3As shown, the top view of the blast furnace top surface is circular, and the top surface is divided into multiple sector partitions 210. Among them, the top view image of the blast furnace top surface can be obtained by an infrared imaging device. After partitioning the material surface, the material surface lowering distance of each partition is detected in the subsequent steps, which can realize the fine management of the internal condition of the blast furnace. Each sector partition can be regarded as an independent management unit, making the monitoring, analysis and adjustment more accurate. At the same time, if the thickness of the protective slag skin of the individual sector partition is abnormal, further detection operation or individual protective slag skin thickness adjustment can be performed on the individual sector partition.

[0075] S102, determining whether an abnormal sector partition of the protective slag skin thickness appears according to the material surface lowering distance of each sector partition in a preset time period.

[0076] Among them, the preset time period includes at least the time period from the end of the previous charging to the beginning of the subsequent charging in the process of charging the blast furnace. In the process of blast furnace production, charging in the blast furnace will be carried out. As the smelting process proceeds, the material surface as a whole will drop in the time period from the end of the previous charging to the beginning of the subsequent charging. The average material surface lowering distance of each sector partition in this time period is determined to determine whether there is an abnormal sector partition of thickness.

[0077] When the sector partition wall of a certain place in the blast furnace appears a thicker part of the protective slag skin, the thicker slag skin of the sector partition will increase the friction between the furnace wall and the furnace charge, so as to reduce the material surface lowering speed; at the same time, the subsequent slag skin will affect the airflow at the edge of the sector partition, so that the insufficient edge airflow will hinder the furnace charge of the sector partition; on the other hand, when the protective slag skin of a certain sector partition is too thick, the material surface of the sector partition will be slowed down by the resistance of the binder. Therefore, the material surface lowering distance of each sector partition in a preset time period can be used to determine whether an abnormal sector partition of the protective slag skin thickness appears. When the lowering distance of the furnace charge of a certain sector partition in a preset time period is smaller than that of other sector partitions, it means that the protective slag skin thickness of the furnace charge of the sector partition is thicker than that of other sector partitions. The judgment of the lowering distance of the sector partition in step S102 can reduce the computational amount of the system while monitoring the lowering of the material surface in real time, which is helpful to realize the real-time monitoring of the material surface state and the protective slag skin thickness.

[0078] S103, if an abnormal sector partition appears, determining the maximum thickness of the protective slag skin corresponding to the abnormal sector partition according to the temperature change of different positions in the abnormal sector partition before and after at least one charging.

[0079] When the edge of the furnace top material surface has a protective slag skin, the airflow in the edge area is hindered due to the blockage of the protective slag skin, the airflow in the edge area is not smooth, and thus the temperature change before and after charging in the edge area is different from the temperature change before and after charging in the middle area.

[0080] In an optional embodiment, based on the difference between the temperature change rate of the edge area with the protective slag skin and the temperature change rate of the middle area without the blockage of the protective slag skin, the demarcation point of the different temperature change rates of the abnormal sector can be determined, the demarcation point is determined as the vertex position of the protective slag skin, and then the maximum thickness of the protective slag skin is determined.

[0081] In another optional embodiment, the vertex position of the protective slag skin can be determined according to the temperature change values of different sampling points. Specifically, in the abnormal sector, the temperature values of the first sector at each sampling point are collected in the time interval from the end of one charging to the beginning of the next charging; the difference between the temperature values of each adjacent sampling point is detected in the direction from the edge area to the center area along the radius. When the temperature difference between a group of adjacent sampling points is greater than a preset threshold, it can be judged that there is a sudden change in the temperature between the group of adjacent sampling points, and the sampling point close to the edge of the material surface in the group of adjacent sampling points is determined as the vertex position of the protective slag skin, and then the maximum thickness of the protective slag skin is determined. Optionally, the preset threshold is determined according to the actual situation of the furnace capacity, furnace charge, etc., which is not limited herein. Specifically, the distance between the vertex of the protective slag skin and the edge of the furnace wall is the maximum thickness of the protective slag skin.

[0082] The judgment method of the protective slag skin thickness of the embodiment of the present application first judges whether there is an abnormal sector of the protective slag skin thickness according to the material surface falling distance before and after the sector charging, so as to more accurately judge whether there is an abnormal area of the protective slag skin thickness. The vertex position of the protective slag skin is judged according to the temperature change before and after the charging of the abnormal sector, and then the maximum thickness of the protective slag skin is judged. Compared with the judgment method of the protective slag skin thickness in the prior art which depends on manual experience, the vertex position of the protective slag skin can be accurately found, and the accuracy of the judgment of the protective slag skin thickness is improved.

[0083] Figure 4 is a flow chart of another judgment method of the protective slag skin thickness of the high furnace provided by the embodiment one of the present application, as shown in Figure 4

[0084] S201, selecting a circular surface starting point of the furnace top material surface;

[0085] Figure 5 is another structural schematic diagram of the furnace top material surface provided by the embodiment one of the present application, as shown in Figure 5 ​As shown, a circular surface starting point 211 of the top surface of the blast furnace is selected to start partitioning the circular surface of the top surface of the blast furnace. The circular surface starting point 211 can be any point on the top surface of the blast furnace, which is not limited herein.

[0086] S202, starting from the circular surface starting point, the top surface of the blast furnace is evenly divided into at least two sector partitions with the center of the top surface as the center and the first division angle.

[0087] The first division angle is negatively correlated with the radius of the top surface of the blast furnace.

[0088] Specifically, as shown in Figure 5 the center of the top surface of the blast furnace is taken as the center and the first division angle is evenly divided into at least two sector partitions 202. Specifically, the center of the top surface can be the center of the circular surface when the top surface of the blast furnace is approximately circular. When the radius of the top surface is large, the volume of the blast furnace is relatively large, so that the first division angle is small, and the sector partitions obtained are more; when the radius of the top surface is small, the volume of the blast furnace is relatively small, so that the first division angle is large, and the sector partitions obtained are less. Alternatively, the first division angle can be selected as 10° to obtain 36 sector partitions. The first division angle is selected according to the actual situation, which is not limited herein.

[0089] S203, determining whether an abnormal sector partition of the protective slag skin thickness appears according to the distance of the top surface of each sector partition in the preset period;

[0090] S204, if an abnormal sector partition appears, determining the maximum thickness of the protective slag skin corresponding to the abnormal sector partition according to the temperature change of different positions in the abnormal sector partition before and after at least one feeding.

[0091] Figure 6 is a flow chart of another judgment method of the protective slag skin thickness of the blast furnace provided by the first embodiment of the present application, as shown in Figure 6 .

[0092] S301, selecting a circular surface starting point of the top surface of the blast furnace;

[0093] S302, starting from the circular surface starting point, the top surface of the blast furnace is evenly divided into at least two sector partitions with the center of the top surface as the center and the first division angle.

[0094] S303, in the preset time period, detecting the distance of the material surface falling in each sector partition in at least two feeding processes, and calculating the first average falling distance of the distance of the material surface falling in at least two feeding processes;

[0095] The preset time period includes a time period from the end of the previous feeding to the beginning of the next feeding in at least two feeding processes. Specifically, when the first division angle is 10°, the material surface is divided into 36 sector partitions, and there are two feedings in the preset time period, then the distance of the material surface falling of the 36 sector partitions is recorded as S1t1-h; S2t1-h; S3t1-h; S4t1-h; …… S36t1-h from the end of the first feeding to the beginning of the second feeding. The distance of the material surface falling of the 36 sector partitions is recorded as S1t2-h; S2t2-h; S3t2-h; S4t2-h; …… S36t2-h from the end of the second feeding to the end of the preset time period. The average of the distance of the material surface falling of each sector partition is calculated as the first average falling distance of the corresponding sector partition.

[0096] For example, taking the first sector partition as an example, the distance of the material surface falling of the first sector partition in the time period from the end of the first feeding to the beginning of the second feeding is S1t1-h, and the distance of the material surface falling of the first sector partition in the time period from the end of the second feeding to the beginning of the third feeding is S1t2-h. The average of the distance of the material surface falling of the first sector partition in the two feedings is calculated as the first average falling distance of the first sector partition. The first average falling distances of the second sector partition to the 36th sector partition are calculated in turn:

[0097] Specifically, Figure 7 is a schematic diagram of the cross-sectional structure of a blast furnace provided by the first embodiment of the present application, as Figure 7 As shown, in the preset time period, the material 312 in the furnace wall 311 will change the height of the material surface due to feeding and time advancement. The material surface zero plane 313 is selected, wherein the material surface zero plane 313 can be selected as the height of the material surface at the end of each feeding in the preset time period. In the time period from the end of one feeding to the beginning of the next feeding, the material surface 314 will fall a certain distance, and the distance of the falling is the distance difference between the material surface 314 and the material surface zero plane 313. The distance of the material surface falling of each sector partition in the time interval is measured, and the average falling distance of at least two feedings is calculated.

[0098] Optionally, the way of measuring the falling distance of the material surface is to select a profilometer to collect data of the material surface. At the end of a feeding, the height of the material surface of each sector is measured by the profilometer, which is t1-h; at the beginning of the next feeding, the height of the material surface of each sector is measured by the profilometer, which is t2-h. Thus, the falling distance of the material surface of each sector in the time interval is obtained.

[0099] S304, determining the sector corresponding to the smallest first average value in each sector as the abnormal sector;

[0100] In the process of blast furnace production, if the sector wall protection slag skin is thicker in a certain sector, the over-thick slag skin of the sector will increase the friction between the furnace wall and the furnace charge, so as to reduce the falling speed of the material surface; at the same time, the subsequent slag skin will affect the airflow at the edge of the sector, so that the insufficient edge airflow hinders the melting of the furnace charge of the sector. Therefore, the falling distance of the material surface of the sector will be smaller than that of other sectors.

[0101] Specifically, after the first average value of the falling distance of each sector in multiple time intervals is calculated in step S303, the sector with the smallest first average value is determined as the abnormal sector.

[0102] S305, if the abnormal sector appears, the maximum thickness of the protection slag skin corresponding to the abnormal sector is determined according to the temperature change of different positions in the abnormal sector before and after at least one feeding.

[0103] Figure 8 is a flow chart of another judgment method of the thickness of the protection slag skin of the blast furnace provided by the embodiment one of the present application, as shown in Figure 8

[0104] S401, selecting a starting point of a circular surface of a blast furnace top material surface;

[0105] S402, starting from the starting point of the circular surface, taking the center of the top material surface as the center of the circle, and dividing the top material surface into at least two sectors by the first division angle;

[0106] S403, in each sector, each sector is divided into at least an edge area and a center area according to the distance range from the center of the material surface, and the edge area is away from the center relative to the center area;

[0107] Figure 9 is another schematic diagram of the top material surface of the blast furnace provided by the embodiment one of the present application, as shown in Figure 9 ​As shown, each sector partition is divided into an edge area 412 and a center area 411 according to the distance of each area from the center of the circle. Optionally, the division of the edge area 412 and the center area 411 for each sector partition is made by the distance of each area from the center of the circle, which is selected according to the actual furnace capacity, which is not limited here.

[0108] S404, in the preset time period, detecting the corresponding material surface falling distance of the edge area and the center area in each sector partition in at least two feeding processes, each adjacent two times, from the end of the previous feeding to the beginning of the next feeding, and calculating the second falling average value of the material surface falling distance of the edge area in at least two feeding processes, and the third falling average value of the material surface falling distance of the center area in at least two feeding processes;

[0109] Specifically, as shown in Figure 9 The material surface is divided into 8 sector partitions, and each sector partition is divided into an edge area 412 and a center area 411. As shown in Figure 7 、 Figure 9 If two batches of feeding are included in the preset time, in the period from the end of the first feeding to the beginning of the second feeding in the preset time period, the material surface will fall, and the falling distance of the center area 411 of all sector partitions is: S1t1-h1; S2t1-h1; S3t1-h1; S4t1-h1; …… S8t1-h1. The falling distance of the edge area 412 of all sector partitions is: S1t1-h2; S2t1-h2; S3t1-h2; S4t1-h2; …… S8t1-h2. In the period from the end of the second feeding to the end of the preset time period, the material surface will fall, and the falling distance of the center area 411 of all sector partitions is: S1t2-h1; S2t2-h1; S3t2-h1; S4t2-h1; …… S8t2-h1. The falling distance of the edge area 412 of all sector partitions is: S1t2-h2; S2t2-h2; S3t2-h2; S4t2-h2; …… S8t2-h2. The falling distance of the edge area 412 in each sector partition in the two periods is averaged to obtain the second falling average value; the falling distance of the center area 411 in each sector partition in the two periods is averaged to obtain the third falling average value.

[0110] For example, in the first sector, the center zone of the sector falls a distance of S1t1-h1 and the edge zone 412 falls a distance of S1t1-h2 in the time period between the end of the first charge and the beginning of the second charge in the preset time period; the center zone of the sector falls a distance of S1t2-h1 and the edge zone 412 falls a distance of S1t2-h2 in the time period between the end of the second charge and the beginning of the third charge in the preset time period. The average of the two distances of the center zone of the first sector is calculated The average of the two distances of the edge zone of the first sector is calculated The second average of the center zone of the second sector to the eighth sector is calculated in sequence, and is denoted as S2t1-h1, S2t2-h1, S3t1-h1, S3t2-h1, S4t1-h1, S4t2-h1, S5t1-h1, S5t2-h1, S6t1-h1, S6t2-h1, S7t1-h1, S7t2-h1, S8t1-h1, S8t2-h1 respectively The third average of the edge zone of the second sector to the eighth sector is calculated, and is denoted as S2t1-h2, S2t2-h2, S3t1-h2, S3t2-h2, S4t1-h2, S4t2-h2, S5t1-h2, S5t2-h2, S6t1-h2, S6t2-h2, S7t1-h2, S7t2-h2, S8t1-h2, S8t2-h2 respectively

[0111] S405, the sector corresponding to the smallest second average and the smallest third average is determined as the abnormal sector.

[0112] After obtaining the second average and the third average of each sector, the sector corresponding to the smallest second average and the smallest third average is determined as the abnormal sector. It is indicated that the vertical movement distance of the sector is gradually reduced, and thus it can be preliminarily judged that the thickness of the protective slag of the sector is increased.

[0113] Optionally, the method for measuring the falling distance of the charge surface is to use a profilometer to collect data of the charge surface. At the end of the first charge, the profilometer is used to measure the height of the charge surface corresponding to the center zone and the edge zone of each sector; at the beginning of the next charge, the profilometer is used to measure the height of the charge surface corresponding to the center zone and the edge zone of each sector. Thus, the falling distance of the charge surface of each sector in the time interval can be obtained.

[0114] S406, if the abnormal sector appears, the maximum thickness of the protective slag corresponding to the abnormal sector is determined according to the temperature change of different positions in the abnormal sector before and after at least one charge

[0115] Another method for judging the thickness of the protective slag skin of a blast furnace provided in the embodiments of the present application includes determining whether an abnormal sector exists in which the thickness of the protective slag skin is abnormal based on the distance by which the material surface of each sector falls within a preset time period, dividing each sector into a central region and an edge region, and comparing the average distance by which the material surface falls in the central region and the edge region within a preset time interval to determine whether an abnormal sector exists. The distribution of the protective slag skin in the region can be more accurately reflected, and the accuracy of the judgment can be improved. A double confirmation mechanism (i.e., the distance by which the material surface falls in both regions is the smallest) is provided, which can reduce the risk of misjudgment caused by a single abnormal data. The mechanism can also better adapt to complex and variable conditions inside the blast furnace, such as uneven distribution of the protective slag skin and fluctuations in the furnace conditions.

[0116] Figure 10 is a flowchart of another method for judging the thickness of the protective slag skin of a blast furnace provided in Embodiment One of the present application, as shown in Figure 10

[0117] S501, the material surface of the blast furnace top is divided into sectors to obtain at least two sectors.

[0118] S502, whether an abnormal sector exists in which the thickness of the protective slag skin is abnormal is determined based on the distance by which the material surface of each sector falls within a preset time period.

[0119] S503, the temperature of each sampling point from the edge to the center of the abnormal sector before a feeding is obtained to determine a first temperature distribution map corresponding to the abnormal sector before the feeding.

[0120] When it is determined that an abnormal sector exists in the sector, the temperature of each sampling point from the edge to the center of the abnormal sector before a feeding is obtained to obtain a first temperature distribution map corresponding to the abnormal sector before the feeding. Specifically, the sampling points are distributed from the edge to the center of the sector, and adjacent sampling points are separated by a first distance. The first distance is designed according to the furnace capacity. When the furnace capacity is large and the radius of the sector is large, the first distance can be set to be large in order for the first temperature distribution map to accurately reflect the temperature change of the abnormal sector before the feeding. When the furnace capacity is small and the radius of the sector is small, the first distance can be set to be relatively small.

[0121] Optionally, in order to accurately reflect the temperature distribution of the abnormal sector, a smaller first division angle can be used when the material surface of the blast furnace top is divided into sectors. Optionally, the first division angle is 10°.

[0122] Optionally, a thermal imaging detector is used to detect the material surface to obtain the temperature information of each sampling point.

[0123] ​S504, obtaining the temperature of each sampling point from the edge to the center of the abnormal sector after one feeding, and determining a second temperature distribution map corresponding to the abnormal sector after the feeding;

[0124] After the abnormal sector is fed, a second temperature distribution map of the abnormal sector is obtained. The sampling points in the second temperature distribution map are the same as those in the first temperature distribution map.

[0125] S505, determining a temperature change map according to the first temperature distribution map and the second temperature distribution map;

[0126] After the first temperature distribution map and the second temperature distribution map are obtained, a temperature change map is determined according to the first temperature distribution map and the second temperature distribution map. Optionally, the temperature change map can be determined by the difference between the temperature value of each sampling point in the second temperature distribution map and the temperature value of each sampling point in the first temperature distribution map.

[0127] S506, determining an inflection point of the temperature change in the abnormal sector according to the temperature change map, the temperature change slopes before and after the inflection point are different; and determining the position of the inflection point as the position of the vertex of the protective slag skin to determine the maximum thickness of the protective slag skin.

[0128] In the process of blast furnace production, when the protective slag skin is generated at the edge of the furnace wall, the airflow in the edge area will be hindered due to the blockage of the protective slag skin, and the airflow in the edge area is not smooth, so the temperature change rate before and after the feeding in the edge area is obviously different from that in the middle area. From the edge to the center, when the airflow distribution of each point in the sector is uniform, the temperature change rate of each point is also consistent, and when the temperature of a sampling point changes sharply, it indicates that the airflow in the region changes, and the slope changes.

[0129] Specifically, after the temperature change map before and after the feeding in the abnormal sector is obtained, an inflection point of the temperature change in the temperature change map can be determined. The appearance of the inflection point indicates that the temperature change rates before and after the inflection point in the sector are inconsistent, that is, in the direction from the edge area to the center area, the temperature increases sharply, and the temperature of the adjacent sampling point in the direction of the edge area of the inflection point is less than that of the adjacent sampling point in the direction of the center area of the inflection point. When the position of the inflection point is determined, the distance of the sampling point where the inflection point is located from the furnace wall is the maximum thickness of the protective slag skin.

[0130] In the production of blast furnace, the formation and change of protective slag skin are affected by various factors, such as the type of furnace charge, the charging speed, etc. The method can better adapt to these complex environments by directly measuring the temperature change, and accurately determine the position of the vertex of the protective slag skin. The temperature change graph drawn by the embodiment of the present application can clearly show the trend of the change of the temperature with the batch of charging and the position of the sampling point in the sector partition. The inflection point, as the point where the temperature change rate changes, can accurately indicate the position of the vertex of the protective slag skin. By identifying the inflection point to determine the position of the vertex of the protective slag skin, the thickness of the protective slag skin can be accurately judged, and whether the thickness of the protective slag skin is appropriate can be quickly evaluated, so as to ensure the stability of the production process of the blast furnace and the product quality.

[0131] Embodiment two

[0132] Figure 11 It is a flow chart of a method for regulating the thickness of the protective slag skin of a blast furnace provided by the embodiment two of the present application. As shown in the above, Figure 11 , the method comprises:

[0133] S601, partitioning the furnace top surface of the blast furnace to obtain at least two sector partitions;

[0134] S602, determining whether an abnormal sector partition of the protective slag skin thickness appears according to the distance of the material surface falling in each sector partition within a preset period;

[0135] S603, if the abnormal sector partition appears, determining the maximum thickness of the protective slag skin corresponding to the abnormal sector partition according to the temperature change of different positions in the abnormal sector partition before and after at least one time of charging.

[0136] S604, regulating the thickness of the protective slag skin according to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector partition is located.

[0137] The preset thickness interval includes at least two, and different preset thickness intervals correspond to different regulation modes;

[0138] Specifically, when the thickness of the protective slag skin is indeed abnormal, the thickness of the protective slag skin needs to be regulated.

[0139] For example, when the thickness of the protective slag skin in the abnormal sector partition is small, the regulation can be performed by adopting a specific charging system. The charging system can be regulated by reducing the amount of ore in the outermost circle or increasing the amount of coke in the outermost circle on the basis of the original charging system. The edge airflow can also be loosened. When the temperature of the edge area of the abnormal sector partition increases to normal and the unloading distance returns to normal, the original charging system can be restored.

[0140] When the thickness of the abnormal sector protection slag skin is moderate, the kind of the newly added material can be adjusted, for example, the dolomite is added to adjust the thickness, and the addition of dolomite can introduce additional CaO and MgO, which can dilute the slag system and reduce the concentration of some high-melting-point components in the original slag system, so as to change the melting point and viscosity of the slag system. When the protection slag skin is thick, the slag skin is not easy to fall off or forms a thick slag layer due to the high viscosity or low melting point of the slag system. By adjusting the composition of the slag skin by adding dolomite, the falling property and updating speed of the slag skin can be improved. By using this regulation method, the temperature of the edge area of the abnormal sector is increased to normal, and the discharging distance is restored to normal.

[0141] When the thickness of the abnormal sector protection slag skin is large, it indicates that high-strength adjustment is needed to adjust the thickness of the protection slag skin, and at this time, the length of the tuyere below the abnormal sector can be set to increase the air flow in this area. At this time, the air flow of the tuyere below can on the one hand wash the slag skin of the furnace wall to accelerate the separation of the protection slag skin, and on the other hand accelerate the melting of the material in the edge area to increase the temperature of the edge area. The temperature of the edge area of the abnormal sector is increased to normal, and the discharging distance is restored to normal.

[0142] When the thickness of the abnormal sector protection slag skin is extremely large, it can be preliminarily determined that the area of the furnace wall is scaled, and measures such as washing the furnace or other adjustment measures need to be taken. The specific other adjustment measures are set according to the actual situation, which is not limited here.

[0143] The embodiment of the present application provides a kind of high furnace protection slag skin thickness regulation method, after determining the maximum thickness of the protection slag skin in abnormal sector, according to the maximum thickness of the protection slag skin in abnormal sector in the preset thickness interval, the regulation of the thickness of the protection slag skin is carried out.The regulation method provided in the embodiment of the present application, according to the thickness of the protection slag skin, different regulation measures are carried out, which is beneficial to improve the regulation efficiency of slag skin thickness, and also avoids the excessive regulation of slag skin thickness to produce excessively high furnace temperature. It is beneficial to reduce unnecessary protection slag consumption and reduce production cost. At the same time, it also reduces the production interruption and scrap rate caused by slag skin problem, which can further reduce production cost.

[0144] Figure 12 It is another kind of high furnace protection slag skin thickness regulation method flow chart provided in the second embodiment of the present application, combined with the above, as shown in Figure 12 According to the maximum thickness of the protection slag skin in abnormal sector in the preset thickness interval, the regulation of the thickness of the protection slag skin is carried out, including:

[0145] It is judged whether the thickness of the protection slag skin in abnormal sector is in the first preset thickness interval, and optionally, the first preset thickness interval is that the thickness of the protection slag skin is greater than or equal to 100mm and less than 200mm.

[0146] When the abnormal sector's protective slag skin thickness is in the first preset thickness interval, the blast furnace top distribution system is adjusted from the current first distribution system to a second distribution system, and a loose edge airflow mode is adopted to adjust the airflow distribution; wherein the second distribution system reduces the outermost circle ore distribution amount or increases the outermost circle coke amount compared to the first distribution system; optionally, the adjustment period is more than 1 day.

[0147] The abnormal sector temperature and the material surface moving distance are monitored, and when the abnormal sector temperature is greater than a first temperature threshold and the material surface moving distance is greater than a first distance threshold, the second distribution system is adjusted back to the first distribution system.

[0148] Figure 13 is another blast furnace protective slag skin thickness adjustment method flowchart provided by the second embodiment of the present application, in combination with the above, as shown in Figure 13 the maximum thickness of the protective slag skin in the abnormal sector is in the preset thickness interval, including:

[0149] It is judged whether the protective slag skin thickness of the abnormal sector is in the second preset thickness interval, and optionally, the second preset thickness interval is that the thickness of the protective slag skin is greater than or equal to 200mm and less than 300mm.

[0150] When the protective slag skin thickness of the abnormal sector is in the second preset thickness interval, the current first distribution system or the second distribution system is adjusted to a third distribution system, and the third distribution system adjusts the outermost circle ore distribution weight level and increases the outermost circle coke weight compared to the first distribution system or the second distribution system; optionally, the adjustment period is 1 day.

[0151] The abnormal sector temperature and the material surface moving distance are monitored, and when the abnormal sector temperature is greater than or equal to a second temperature threshold and the material surface moving distance is greater than a second distance threshold, the second distribution system is adjusted;

[0152] The minimum value of the second preset thickness interval is greater than or equal to the maximum value of the first preset thickness interval.

[0153] Figure 14 is another blast furnace protective slag skin thickness adjustment method flowchart provided by the second embodiment of the present application, in combination with the above, as shown in Figure 14 the maximum thickness of the protective slag skin in the abnormal sector is in the preset thickness interval, including:

[0154] It is judged whether the protective slag skin thickness of the abnormal sector is in the third preset thickness interval, and optionally, the third preset thickness interval is that the thickness of the protective slag skin is greater than or equal to 300mm and less than 400mm.

[0155] When the abnormal sector's protective slag skin thickness is in the third preset thickness interval, the current burdening system is adjusted to a fourth burdening system, and the fourth burdening system comprises: continuing to use the third burdening system, while adding a first weight of dolomite to the outermost circle of the ore, and the adding period of the dolomite is a second period; optionally, the first weight is 1 ton, and the specific selection of the first weight is determined according to the furnace capacity, which is not limited herein. The second period is to add 6 batches every 4 hours, and the specific selection of the second period is also determined according to the furnace capacity, which is not limited herein.

[0156] The temperature and the moving distance of the material surface of the abnormal sector are monitored, and when the temperature of the abnormal sector is greater than a third temperature threshold value and the moving distance of the material surface is greater than a third distance threshold value, the third burdening system is used.

[0157] The minimum value of the third preset thickness interval is greater than or equal to the maximum value of the second preset thickness interval.

[0158] Figure 15 It is another process flow diagram of the method for adjusting and controlling the thickness of the protective slag skin of the blast furnace provided in Embodiment Two, and as shown in Figure 15 According to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector is located, the thickness of the protective slag skin is adjusted and controlled, which comprises:

[0159] It is judged whether the thickness of the protective slag skin in the abnormal sector is in a fourth preset thickness interval, and optionally, the thickness of the protective slag skin in the fourth preset thickness interval is greater than or equal to 400 mm and less than 500 mm.

[0160] When the thickness of the protective slag skin in the abnormal sector is in the fourth preset thickness interval, the current burdening system is adjusted to a fifth burdening system, and the fifth burdening system comprises:

[0161] The lower tuyere is adjusted, the length of the lower tuyere corresponding to the abnormal sector is shortened to increase the edge gas flow, so as to flush the slag skin of the furnace wall, and the length of the tuyere is shortened. Optionally, the adjustment amount of the length of the tuyere is 5 mm, and the specific adjustment amount is set according to the actual situation, which is not limited herein.

[0162] The temperature and the moving distance of the material surface of the abnormal sector are monitored, and when the temperature of the abnormal sector is greater than a fourth temperature threshold value and the moving distance of the material surface is greater than a fourth distance threshold value, the fourth burdening system is used.

[0163] The minimum value of the fourth preset thickness interval is greater than or equal to the maximum value of the third preset thickness interval.

[0164] Optionally, when the abnormal sector is still unable to reduce the thickness of the protective slag skin after being adjusted according to the above adjustment method, it is determined that the furnace wall of the sector is scaled, and a special technical solution such as furnace washing is adopted, and the specific adjustment technical solution is designed according to the actual situation, which is not limited here.

[0165] The blast furnace protective slag skin thickness adjustment method provided by the embodiment of the application, wherein four preset thickness intervals are designed according to the thickness of the protective slag skin of the abnormal sector. Different measures are taken to adjust the thickness of the protective slag skin according to the thickness of the protective slag skin of the abnormal sector in different thickness preset intervals. The embodiment of the application can realize accurate control of the thickness of the blast furnace protective slag skin by designing four preset thickness intervals and taking different adjustment measures for different intervals. It is helpful to prevent various problems caused by too thick or too thin slag skin, thereby improving the stability of the blast furnace operation.

[0166] The above specific embodiments do not constitute a limitation on the protection scope of the application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A method of judging a thickness of a protecting slag skin of a blast furnace, characterized by, The method comprises the following steps: dividing the furnace top charging surface into at least two sectors; determining whether an abnormal sector of the protective slag skin thickness exists according to the distance of the surface falling in each sector within a preset time period; the preset time period includes the time period from the end of the previous charging to the beginning of the next charging in at least two times of charging; if the abnormal sector exists, determining the maximum thickness of the protective slag skin corresponding to the abnormal sector according to the temperature change of different positions in the abnormal sector before and after at least one time of charging.

2. The method of judging the thickness of the protecting slag skin of a blast furnace according to claim 1, characterized in that, The method for dividing the furnace top charging surface into at least two sectors comprises the following steps: selecting a starting point of the circular surface of the furnace top charging surface; dividing the furnace top charging surface into at least two sectors by taking the center of the furnace top charging surface as the center and the first division angle as the average division angle from the starting point of the circular surface; wherein the first division angle is negatively correlated with the radius of the furnace top charging surface.

3. The method of judging the thickness of the protecting slag skin of a blast furnace according to claim 2, characterized in that, The method for determining whether an abnormal sector of the protective slag skin thickness exists comprises the following steps: the preset time period includes the time period from the end of the previous charging to the beginning of the next charging in at least two times of charging; in the preset time period, detecting the distance of the surface falling in each sector within the time period from the end of the previous charging to the beginning of the next charging in at least two times of charging and calculating the first falling average value of the distance of the surface falling in at least two times of charging; determining the sector corresponding to the minimum first falling average value in each sector as the abnormal sector.

4. The method of judging the thickness of the protecting slag skin of a blast furnace according to claim 2, characterized by The method for determining whether an abnormal sector of the protective slag skin thickness exists comprises the following steps: in each sector, dividing each sector into at least an edge area and a center area according to the distance range from the center of the surface, and the edge area is farther away from the center than the center area; the preset time period includes the time period from the end of the previous charging to the beginning of the next charging in at least two times of charging; in the preset time period, detecting the distance of the surface falling in the edge area and the center area in each sector within the time period from the end of the previous charging to the beginning of the next charging in at least two times of charging and calculating the second falling average value of the distance of the surface falling in the edge area in at least two times of charging and the third falling average value of the distance of the surface falling in the center area in at least two times of charging; determining the sector corresponding to the minimum second falling average value and the minimum third falling average value in each sector as the abnormal sector.

5. The method for determining the thickness of the protective slag skin of the blast furnace according to claim 1, wherein the maximum thickness of the protective slag skin corresponding to the abnormal sector is determined according to the temperature change of different positions in the abnormal sector before and after at least one time of charging, which comprises the following steps: obtaining the temperature of each sampling point from the edge to the center of the abnormal sector before one time of charging to determine the first temperature distribution map corresponding to the abnormal sector before charging. ​ acquiring the temperature of each sampling point from the edge to the center of the abnormal sector after a feeding, determining a second temperature distribution map corresponding to the abnormal sector after the feeding; determining the temperature change map according to the first temperature distribution map and the second temperature distribution map; determining the inflection point of the temperature change of the abnormal sector according to the temperature change map, the temperature change slopes before and after the inflection point are different; determining the position of the inflection point as the position of the top of the protective slag skin to determine the maximum thickness of the protective slag skin.

6. A method for regulating the thickness of a blast furnace protective slag skin, characterized by, comprising: controlling the thickness of the protective slag skin according to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector is located; wherein the preset thickness interval includes at least two, and different preset thickness intervals correspond to different control methods; wherein the maximum thickness of the protective slag skin in the abnormal sector is determined according to the thickness determination method of the protective slag skin of the blast furnace of any one of claims 1-5.

7. The method for regulating the thickness of the protective slag skin of a blast furnace according to claim 6, characterized in that, controlling the thickness of the protective slag skin according to the preset thickness interval in which the maximum thickness of the protective slag skin in the abnormal sector is located, comprising: when the thickness of the protective slag skin in the abnormal sector is within the first preset thickness interval, adjusting the blast furnace top distribution system from the current first distribution system to the second distribution system, and adopting the loose edge airflow mode to adjust the airflow distribution; wherein the second distribution system reduces the amount of ore distribution in the outermost circle or increases the amount of coke in the outermost circle compared to the first distribution system; monitoring the temperature and the moving distance of the abnormal sector, and when the temperature of the abnormal sector is greater than the first temperature threshold and the moving distance of the material surface is greater than the first distance threshold, adjusting the first distribution system to the second distribution system.

8. The method for regulating the thickness of the protective slag skin of a blast furnace according to claim 7, characterized in that, controlling the thickness of the protective slag skin according to the interval in which the maximum thickness of the protective slag skin in the abnormal sector is located, further comprising: when the thickness of the protective slag skin in the abnormal sector is within the second preset thickness interval, adjusting the current first distribution system or the second distribution system to the third distribution system, and adjusting the weight level of the ore distribution in the outermost circle and increasing the weight of the coke in the outermost circle compared to the first distribution system or the second distribution system; monitoring the temperature and the moving distance of the abnormal sector, and when the temperature of the abnormal sector is greater than the second temperature threshold and the moving distance of the material surface is greater than the second distance threshold, changing to the second distribution system; wherein the minimum value of the second preset thickness interval is greater than or equal to the maximum value of the first preset thickness interval.

9. The method for regulating the thickness of the protective slag skin of a blast furnace according to claim 8, characterized in that, controlling the thickness of the protective slag skin according to the interval in which the maximum thickness of the protective slag skin in the abnormal sector is located, further comprising: when the thickness of the protective slag skin in the abnormal sector is within the third preset thickness interval, adjusting the current distribution system to the fourth distribution system, and the fourth distribution system comprises: continuing to use the third distribution system, and adding a first weight of dolomite to the outermost circle of the ore with a second feeding period; monitoring the temperature and the moving distance of the abnormal sector, and when the temperature of the abnormal sector is greater than the third temperature threshold and the moving distance of the material surface is greater than the third distance threshold, changing to the third distribution system; The minimum value of the third preset thickness interval is greater than or equal to the maximum value of the second preset thickness interval.

10. The method for regulating the thickness of the protective slag skin of a blast furnace according to claim 9, characterized in that, The control of the thickness of the protective slag skin according to the interval in which the maximum thickness of the protective slag skin in the abnormal sector is located further comprises: When the thickness of the protective slag skin in the abnormal sector is within the fourth preset thickness interval, the current distribution system is adjusted to a fifth distribution system, and the fifth distribution system comprises: Adjusting the lower tuyere to increase the edge gas flow by shortening the length of the lower tuyere corresponding to the abnormal sector, thereby flushing the slag skin of the furnace wall and shortening the tuyere length; Monitoring the temperature and the moving distance of the material surface of the abnormal sector, and when the temperature of the abnormal sector is greater than a fourth temperature threshold and the moving distance of the material surface is greater than a fourth distance threshold, a fourth distribution system is used; The minimum value of the fourth preset thickness interval is greater than or equal to the maximum value of the third preset thickness interval.

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