阅读说明：本技术 一种高炉炉缸工作不均匀的判断方法 (Method for judging uneven work of blast furnace hearth ) 是由 卢瑜 赵华涛 杜屏 朱华 于 2021-06-01 设计创作，主要内容包括：一种高炉炉缸工作不均匀的判断方法,采集高炉每炉铁水的实际出铁和出渣信息,并记录高炉出铁的出铁次数、实际出铁量、实际出渣量、出铁时间、出渣时间、铁口深度、铁水温度、铁水成分,然后计算每次出铁时的铁流速度和见渣率,并去掉高炉修沟期间的数据,建立高炉每天各铁口的出渣出铁信息,根据目标铁口实际出铁量、实际出渣量、硅含量、铁水温度、铁流速度和见渣率条件,判断高炉的各个铁口是否存在工作不均匀的情况。本发明以每次出铁时每个铁口的出铁出渣参数为基础,结合下部风口送风均匀性、炉顶布料设置,对炉缸工作均匀性进行诊断,并找到炉缸工作不均匀的原因,从而对出铁制度、送风制度和布料制度进行优化,快速、准确。(A method for judging the uneven work of blast furnace hearth includes such steps as collecting the actual tapping and slag-off information of molten iron in each blast furnace, recording the tapping times, actual tapping quantity, actual slag-off quantity, tapping time, slag-off time, tap hole depth, molten iron temperature and molten iron composition, calculating the iron flow speed and slag-seeing rate of each tapping, removing the data of blast furnace during repairing the channel, creating the slag-off tapping information of each tap hole in each day, and judging if each tap hole in blast furnace has uneven work according to the conditions of target tap hole actual tapping quantity, actual slag-off quantity, silicon content, molten iron temperature, iron flow speed and slag-seeing rate. The invention diagnoses the working uniformity of the furnace hearth based on the tapping and slag tapping parameters of each tap hole in each tapping process by combining the air supply uniformity of the lower tuyere and the distribution arrangement of the furnace top, and finds out the reason of the non-uniform working of the furnace hearth, thereby optimizing the tapping system, the air supply system and the distribution system quickly and accurately.)

1. A method for judging uneven work of a blast furnace hearth is characterized by comprising the following steps:

acquiring actual tapping and slag tapping information of molten iron in each blast furnace, recording tapping times, actual tapping amount, actual slag amount, tapping time, slag tapping time, tap hole depth, molten iron temperature and molten iron components of the tapped molten iron in the blast furnace, calculating the iron flow speed and slag rate during each tapping, removing data during the blast furnace channel repairing period, and establishing slag tapping and tapping information of each tap hole of the blast furnace every day;

selecting a target time period in the production process of the blast furnace, and analyzing the working uniformity of a furnace cylinder of the blast furnace in the target time period according to the following characteristics:

a) in a target time period, the actual iron yield of a certain iron notch is always smaller than the actual iron yields of other iron notches, and the difference is larger than 8% of the theoretical iron yield of a single iron notch;

b) in a target time period, the actual slag discharge amount of the iron notch is always smaller than the actual slag discharge amount of other iron notches, and the difference value is larger than 8% of the theoretical slag discharge amount of a single iron notch;

c) in a target time period, the silicon content of the molten iron of the taphole is always smaller than the silicon content of other tapholes, and the difference is not less than 8 percent of the target silicon content;

d) in a target time period, the temperature of the molten iron at the iron notch is always lower than the temperature of the molten iron at other iron notches, and the difference is not lower than 5 ℃;

e) in a target time period, the iron flow speed of the iron notch is obviously lower than that of other iron notches, and the difference is more than 0.5 t/min;

f) in a target time period, the slag rate of the taphole is less than 0.9, and the slag rates of other tapholes are more than 0.9;

if a), b), c), d), e) and f) are simultaneously satisfied, the condition that the operation of each iron notch of the blast furnace is uneven is judged.

2. The method as claimed in claim 1, wherein the target time period is not less than 5 days.

3. The method according to claim 1, wherein when there is an uneven operation in one of the tapholes of the blast furnace during the target time period,

if the depth of the taphole is smaller than the depths of the tapholes of other tapholes and the difference is larger than 0.1m, improving the level of a gunner by improving the quality of the stemming, increasing the mud beating amount or increasing the training of the gunner, improving the depth of the taphole of one taphole, so as to increase the tapping amount and the slag output of the taphole and improve the working nonuniformity of a furnace cylinder;

if the tapping frequency of the tap hole is less than that of other tap holes, the tapping frequency of the tap hole is increased by optimizing a tapping system, so that the tapping amount and the slag output of the tap hole are increased, and the hearth works uniformly;

thirdly, if the depth of the taphole is equivalent to that of other tapholes, the tapping frequency of the taphole is equivalent to that of other tapholes, and the tapping amount of the taphole is less than that of other tapholes, the diameter of the drill rod is increased, so that the tapping amount of the taphole is increased, and the working uniformity of the hearth is improved;

if the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is larger than that of the furnace throats corresponding to the directions of other iron notches, the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is reduced by optimizing a reladling period and a forward and reverse rotation period of the chute, so that the uniformity of the ore-coke ratio of the furnace throat is improved, and the circumferential uniformity of the blanking speed is ensured;

if the number of the small air ports in the iron notch direction is more or the number of the coal injection guns is less, the number of the coal injection guns is increased by reducing the number of the small air ports corresponding to the iron notch or adjusting the angle of the coal injection guns, thereby improving the circumferential uniformity of the working state of the air ports and adjusting the uniformity of the blanking speed.

4. The method for judging the uneven operation of the blast furnace hearth according to claim 1, wherein the method for acquiring the actual tapping and slag tapping information of the molten iron per furnace in the first step is as follows: 1) collecting the weight, components and molten iron temperature information of each packet of molten iron, carrying out one-to-one correspondence on the weight, the components and the molten iron temperature of each packet of molten iron according to the packet number, and recording the weight, the components and the molten iron temperature in a database; 2) summarizing and counting according to the furnace number to obtain the actual weight, components and temperature of molten iron in each furnace, and recording the actual weight, components and temperature in a database; 3) collecting the actual slag quantity, tapping time, slag discharging time and tap hole depth of molten iron in each furnace, and recording the actual slag quantity, tapping time, slag discharging time and tap hole depth in a database; 4) the statistical data of the step 2) and the data collected in the step 3) are in one-to-one correspondence according to the furnace number to obtain the actual tapping and slag tapping information of the molten iron in each furnace; 5) the tapping frequency, the tapping quantity and the slag quantity are summed according to each iron notch to obtain corresponding parameters of each iron notch every day; and calculating the average value of the tapping time, the iron flow speed, the slag index, the molten iron temperature, the iron notch depth and the molten iron components according to each iron notch to obtain the corresponding parameters of each iron notch every day.

5. The method of claim 1, wherein the blast furnace includes at least 2 tapholes.

Technical Field

The invention relates to the technical field of ferrous metallurgy, in particular to a method for judging uneven work of a blast furnace hearth.

Background

The working uniformity of the blast furnace hearth refers to the difference in the circumferential direction when the hearth works. When the difference in the circumferential direction of the furnace hearth is smaller, the circumferential working uniformity is better, which mainly shows that the difference of slag discharging and iron tapping of each iron notch is small, the difference of molten iron temperature, Si and S of each iron notch is small, the fluidity of molten iron is good, no molten iron circulation exists, the probability of abnormal erosion of refractory materials of the furnace hearth is smaller, and the method has important significance on the service life of the furnace hearth and the service life of the blast furnace, and is particularly suitable for the super-large blast furnace. At present, because the working state of the hearth is difficult to directly observe due to the high-temperature and high-pressure environment in the hearth, research on quantitative evaluation of the circumferential working uniformity of the blast furnace hearth is still few.

Leyanolong et al (research on working state of blast furnace hearth at 5500m of Jing Tang Dynasty university, Ph. thesis at Beijing science and technology university) combined with historical data and operating parameters of thermocouple in circumferential direction of hearth bottom of blast furnace hearth at 5500m of Jing Tang Dynasty, proposes a circumferential working uniformity index model of hearth, and the main content of the model selects a thermocouple T at center of hearth bottom_B1Inner ring thermocouple T_B2-iOuter ring thermocouple T_B3-iAnd elephant foot zone thermocouple T_H4-I, T_H5-iSide wall zone thermocouple T_H1-i, T_H2-i, T_H3-i111 thermocouples (below the taphole) are used as analysis data, the hearth and the hearth are totally divided into 56 areas with different positions along the radial direction, the height direction and the circumferential direction of the hearth according to the positions of the thermocouples, and then the circumferential working uniformity index of the hearth in the whole circumferential direction of the blast furnace is calculated according to the divided area thermoelectric even dataIn the formula:

n is a furnace hearth area divided in the circumferential direction, and the furnace hearth bottom is divided into 8 areas along the circumferential direction;

-average thermocouple temperature at the same elevation and insertion depth for all zones in the circumferential direction;

thermocouple temperature averages at the same elevation and insertion depth for a certain area in the circumferential direction.

However, the method for judging the working uniformity of the furnace hearth by evaluating the temperature uniformity of the thermocouple of the furnace hearth is indirect and one-sided. Meanwhile, as the erosion degree of refractory materials in a certain direction is larger only if the furnace hearth has long-term difference in the certain direction, the phenomenon that the temperature of the thermocouple of the furnace hearth in the direction is higher is caused, and therefore, the reaction of the temperature of the thermocouple at the bottom of the furnace hearth on the working state of the furnace hearth is delayed and delayed.

Disclosure of Invention

The technical problem to be solved is as follows: aiming at the technical problems, the invention provides a method for judging the uneven work of a blast furnace hearth, which finds out the reason for the difference of the work of the hearth in the circumferential direction according to the method and optimizes a slag tapping and tapping system, an air supply system and a material distribution system so as to improve the work uniformity of the hearth.

The technical scheme is as follows: a method for judging uneven work of a blast furnace hearth comprises the following steps: acquiring actual tapping and slag tapping information of molten iron in each blast furnace, recording tapping times, actual tapping amount, actual slag amount, tapping time, slag tapping time, tap hole depth, molten iron temperature and molten iron components of the tapped molten iron in the blast furnace, calculating the iron flow speed and slag rate during each tapping, removing data during blast furnace channel repair, and establishing a slag tapping and slag tapping information and iron flow speed calculation formula of each tap hole in each day of the blast furnace: actual tapping quantity per furnace ÷ actual tapping time per furnace, see the formula for calculating the slag rate: actual slag tapping time per furnace divided by actual tapping time per furnace;

selecting a target time period in the production process of the blast furnace, and analyzing the working uniformity of a furnace cylinder of the blast furnace in the target time period according to the following characteristics:

a) in a target time period, the actual iron yield (t) of a certain iron notch is always smaller than the actual iron yields of other iron notches, and the difference is larger than 8% of the theoretical iron yield of a single iron notch;

b) in a target time period, the actual slag discharge (t) of the taphole is always smaller than the actual slag discharge of other tapholes, and the difference is more than 8% of the theoretical slag discharge of a single taphole;

c) in a target time period, the silicon content (wt%) of the molten iron of the taphole is always smaller than that of other tapholes, and the difference is not less than 8% of the target silicon content;

d) in a target time period, the temperature (DEG C) of the molten iron of the iron notch is always lower than the temperature of the molten iron of other iron notches, and the difference value is not lower than 5 ℃;

e) in a target time period, the iron flow speed (t/min) of the iron notch is obviously lower than that of other iron notches, and the difference is greater than 0.5 t/min;

f) in a target time period, the slag rate of the taphole is less than 0.9, and the slag rates of other tapholes are more than 0.9;

if a), b), c), d), e) and f) are simultaneously satisfied, the condition that the operation of each iron notch of the blast furnace is uneven is judged.

Preferably, the target period is not less than 5 days.

Preferably, in the target time period, when the operation of one iron notch of the blast furnace is uneven,

if the depth (m) of the taphole is smaller than the tapholes of other tapholes and the difference is larger than 0.1m, improving the level of a gunman by improving the quality of the stemming, increasing the mud beating amount or increasing the training of the gunman, improving the depth of the taphole of one taphole, so as to increase the iron output and slag output of the taphole and improve the working nonuniformity of a furnace hearth;

if the tapping frequency of the tap hole is less than that of other tap holes, the tapping frequency of the tap hole is increased by optimizing a tapping system, so that the tapping amount and the slag output of the tap hole are increased, and the hearth works uniformly;

thirdly, if the depth of the taphole is equivalent to that of other tapholes, the tapping frequency of the taphole is equivalent to that of other tapholes, and the tapping amount of the taphole is less than that of other tapholes, the diameter of the drill rod is increased, so that the tapping amount of the taphole is increased, and the working uniformity of the hearth is improved;

if the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is larger than that of the furnace throats corresponding to the directions of other iron notches, the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is reduced by optimizing a reladling period and a forward and reverse rotation period of the chute, so that the uniformity of the ore-coke ratio of the furnace throat is improved, and the circumferential uniformity of the blanking speed is ensured;

if the number of the small air ports in the iron notch direction is more or the number of the coal injection guns is less, the number of the coal injection guns is increased by reducing the number of the small air ports corresponding to the iron notch or adjusting the angle of the coal injection guns, thereby improving the circumferential uniformity of the working state of the air ports and adjusting the uniformity of the blanking speed.

Preferably, the method for acquiring the actual tapping and tapping information of molten iron in each furnace in the first step is as follows: 1) collecting the weight, components and molten iron temperature information of each packet of molten iron, carrying out one-to-one correspondence on the weight, the components and the molten iron temperature of each packet of molten iron according to the packet number, and recording the weight, the components and the molten iron temperature in a database; 2) summarizing and counting according to the furnace number to obtain the actual weight, components and temperature of molten iron in each furnace, and recording the actual weight, components and temperature in a database; 3) collecting the actual slag quantity, tapping time, slag discharging time and tap hole depth of molten iron in each furnace, and recording the actual slag quantity, tapping time, slag discharging time and tap hole depth in a database; 4) the statistical data of the step 2) and the data collected in the step 3) are in one-to-one correspondence according to the furnace number to obtain the actual tapping and slag tapping information of the molten iron in each furnace; 5) the tapping frequency, the tapping quantity and the actual slag quantity are summed according to each iron notch to obtain corresponding parameters of each iron notch every day; and calculating the average value of the tapping time, the iron flow speed, the slag index, the molten iron temperature, the iron notch depth and the molten iron components according to each iron notch to obtain the corresponding parameters of each iron notch every day.

Preferably, the blast furnace comprises at least 2 tapholes.

Has the advantages that:

1. the method can quantitatively, accurately and quickly evaluate the circumferential working uniformity of the on-site blast furnace hearth, can feed back information in time, reduces the processing time delay caused by information mismatching and a conventional experience judgment method, and greatly increases the economic benefit.

2. The existing method for evaluating circumferential working uniformity of the hearth is used for judging and calculating by using the circumferential uniformity of the thermocouple temperature at the bottom of the hearth, and has great hysteresis. The method of the invention is based on the tapping and slag parameters of each tap hole during tapping, combines the air supply uniformity of the lower tuyere and the arrangement of the material distribution on the furnace top, diagnoses the working uniformity of the furnace hearth, and finds out the reason of the non-uniform working of the furnace hearth, thereby optimizing the tapping system, the air supply system and the material distribution system quickly and accurately, and the method is difficult for the technicians in the field to think.

Drawings

FIG. 1 is a layout view of an iron notch and a tuyere of a blast furnace for 5800m high speed plantation;

FIG. 2 is a drawing illustrating a change trend of the iron tap amount of each taphole of a 5800m high speed blast furnace;

FIG. 3 is a trend graph of slag discharge quantity change of each iron notch of a blast furnace planted at 5800m distance from top to bottom;

FIG. 4 is a graph showing the variation trend of Si at each taphole of a 5800m high-speed blast furnace;

FIG. 5 is a drawing illustrating a trend of temperature change of molten iron at each taphole of a 5800m high speed blast furnace;

FIG. 6 is a diagram illustrating a trend of iron flow change at each taphole of a 5800m high-speed blast furnace;

FIG. 7 is a drawing illustrating a trend of slag index change at each taphole of a 5800m high-speed blast furnace;

FIG. 8 is a drawing illustrating a taphole depth map of each taphole of a 5800m high pressure casting blast furnace;

FIG. 9 is a diagram illustrating the diameter of each tuyere and the coal injection of a 5800m high speed blast furnace.

Detailed Description

The invention is further described below with reference to the accompanying drawings and specific embodiments.

Example 1

A method for judging uneven work of a blast furnace hearth comprises the following steps: acquiring actual tapping and slag tapping information of molten iron in each blast furnace, recording tapping times, actual tapping amount, actual slag amount, tapping time, slag tapping time, tap hole depth, molten iron temperature and molten iron components of the tapped molten iron in the blast furnace, calculating the iron flow speed and slag rate during each tapping, removing data during the blast furnace channel repairing period, and establishing slag tapping and tapping information of each tap hole of the blast furnace every day;

selecting a target time period (not less than 5 days) in the production process of the blast furnace, and analyzing the working uniformity of a furnace cylinder of the blast furnace in the target time period according to the following characteristics:

a) in a target time period, the actual iron yield of a certain iron notch is always smaller than the actual iron yields of other iron notches, and the difference is larger than 8% of the theoretical iron yield of a single iron notch;

b) in a target time period, the actual slag discharge amount of the iron notch is always smaller than the actual slag discharge amount of other iron notches, and the difference value is larger than 8% of the theoretical slag discharge amount of a single iron notch;

c) in a target time period, the silicon content of the molten iron of the taphole is always smaller than the silicon content of other tapholes, and the difference is not less than 8 percent of the target silicon content;

d) in a target time period, the temperature of the molten iron at the iron notch is always lower than the temperature of the molten iron at other iron notches, and the difference is not lower than 5 ℃;

e) in a target time period, the iron flow speed of the iron notch is obviously lower than that of other iron notches, and the difference is more than 0.5 t/min;

f) in a target time period, the slag rate of the taphole is less than 0.9, and the slag rates of other tapholes are more than 0.9;

if a), b), c), d), e) and f) are simultaneously satisfied, the condition that the operation of each iron notch of the blast furnace is uneven is judged.

Preferably, in the target time period, when the operation of one iron notch of the blast furnace is uneven,

if the depth of the taphole is smaller than the depths of the tapholes of other tapholes and the difference is larger than 0.1m, improving the level of a gunner by improving the quality of the stemming, increasing the mud beating amount or increasing the training of the gunner, improving the depth of the taphole of one taphole, so as to increase the tapping amount and the slag output of the taphole and improve the working nonuniformity of a furnace cylinder;

if the tapping frequency of the tap hole is less than that of other tap holes, the tapping frequency of the tap hole is increased by optimizing a tapping system, so that the tapping amount and the slag output of the tap hole are increased, and the hearth works uniformly;

thirdly, if the depth of the taphole is equivalent to that of other tapholes, the tapping frequency of the taphole is equivalent to that of other tapholes, and the tapping amount of the taphole is less than that of other tapholes, the diameter of the drill rod is increased, so that the tapping amount of the taphole is increased, and the working uniformity of the hearth is improved;

if the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is larger than that of the furnace throats corresponding to the directions of other iron notches, the ore-coke ratio of the furnace throat corresponding to the direction of the iron notch is reduced by optimizing a reladling period and a forward and reverse rotation period of the chute, so that the uniformity of the ore-coke ratio of the furnace throat is improved, and the circumferential uniformity of the blanking speed is ensured;

if the number of the small air ports in the iron notch direction is more or the number of the coal injection guns is less, the number of the coal injection guns is increased by reducing the number of the small air ports corresponding to the iron notch or adjusting the angle of the coal injection guns, thereby improving the circumferential uniformity of the working state of the air ports and adjusting the uniformity of the blanking speed.

Example 2

The difference from the example 1 is that the actual tapping and tapping information of molten iron in each furnace in the first step is acquired by the following method: 1) collecting the weight, components and molten iron temperature information of each packet of molten iron, carrying out one-to-one correspondence on the weight, the components and the molten iron temperature of each packet of molten iron according to the packet number, and recording the weight, the components and the molten iron temperature in a database; 2) summarizing and counting according to the furnace number to obtain the actual weight, components and temperature of molten iron in each furnace, and recording the actual weight, components and temperature in a database; 3) collecting the actual slag quantity, tapping time, slag discharging time and tap hole depth of molten iron in each furnace, and recording the actual slag quantity, tapping time, slag discharging time and tap hole depth in a database; 4) the statistical data of the step 2) and the data collected in the step 3) are in one-to-one correspondence according to the furnace number to obtain the actual tapping and slag tapping information of the molten iron in each furnace; 5) the tapping frequency, the tapping quantity and the actual slag quantity are summed according to each iron notch to obtain corresponding parameters of each iron notch every day; and calculating the average value of the tapping time, the iron flow speed, the slag index, the molten iron temperature, the iron notch depth and the molten iron components according to each iron notch to obtain the corresponding parameters of each iron notch every day.

Example 3

As in example 1, specifically: the implementation details are described in detail by using 5800m to train the blast furnace hearth with uneven work:

the capacity of a certain 5800 blast furnace of Jiangsu sand Steel group Limited company is 5800m, 3 iron notches are matched, 3 iron notches are continuously cast (an iron notch distribution diagram is shown in figure 1, and the first- ㊵ in the figure is a tuyere mark), the theoretical iron yield of a single iron notch is 4250t, the theoretical water slag content is 1660t, and the target value of Si is 0.4, blast furnace production information in the target time period of 2020, 1 month, 5 days-2020, 1 month and 10 days is collected (tables 1-3), and the state of a blast furnace hearth has the following characteristics:

TABLE 15800 tapping and slag information table for blast furnace

TABLE 25800 tapping and slag information table of blast furnace (continuation 1)

TABLE 35800 tapping information Table for blast furnace (continuation 2)

a. In the target time period, referring to fig. 2, the actual tapping amount of the No. 2 taphole is always smaller than the actual tapping amounts of the other tapholes, and the actual difference is above 425 t.

b. In the target time period, referring to fig. 3, the actual slag discharge amount of the taphole is always smaller than the actual slag discharge amount of other tapholes, and the actual difference is above 166 t.

c. In the target time period, referring to fig. 4, the silicon content of the molten iron of the taphole is always smaller than that of other tapholes, and the actual difference is more than 0.04.

d. In the target time period, referring to fig. 5, the molten iron temperature of the taphole is always lower than the molten iron temperatures of the other tapholes, and the actual difference is above 5 ℃.

e. In the target time period, referring to fig. 6, the iron flow speed of the iron notch is obviously lower than that of other iron notches, and the actual difference is more than 0.5 t/min.

f. In the target time period, referring to fig. 7, the slag rate of the taphole is less than 0.9, and the slag rates of the other tapholes are more than 0.9.

a) B), c), d), e) and f) are satisfied simultaneously, the operation of each taphole of the blast furnace is uneven. The characteristics of less iron tapping and slag discharging, low Si, low molten iron temperature, small iron flow, late slag occurrence and the like of the 2# iron notch exist all the time from 5 days to 10 days in 1 month to 10 year 2020, and the characteristics of uneven work of the furnace hearth are met, and the existence of the 2# iron notch is judged to be uneven.

And in the target time period, when the condition that one iron notch of the blast furnace works unevenly exists, repairing. The method comprises the following specific steps:

during the period from 1 month to 5 days to 10 days in 2020, referring to fig. 8, the depth of the taphole of the 2# taphole is always shallow (fig. 8), and the maintenance of the depth of the taphole of the 2# taphole can be improved by improving the quality of stemming, increasing the amount of stemming, increasing training of firearms, improving the level of the firearms, and the like.

Further, referring to table 1, in the above time period, the tapping times of the # 1, # 2 and # 3 tapholes are relatively uniform, the tapping times can be maintained unchanged, and the diameter of the drill rod can be properly increased, so that the tapping slag amount of the # 2 taphole is increased.

Furthermore, in the time period, the 5800 blast furnace adopts a parallel-tank bell-less furnace top all the time, a west-tank coke-east-tank ore distribution mode is adopted for a long time, the rotation direction of the chute is anticlockwise, the ore-coke ratio in the northwest direction (above a No. 2 iron notch) is easy to be large, the blanking speed is slow, and the method can be carried out by adopting a chute reversing- (reversing + pouring) -reversing- (reversing + pouring) mode.

Furthermore, in the time period, the diameter distribution diagram of the 5800 blast furnace tuyere and the coal gun state distribution are shown in fig. 9, the distribution of the large tuyere and the tuyere without coal injection are relatively uniform in the east, west, south and north directions, and the tuyere distribution and the coal gun state distribution can be maintained unchanged.

Example 4

The difference from example 1 is that, specifically, a 2680m blast furnace of Jiangsu sand steel group company Limited has a capacity of 2680m, 2 tapholes in east and west are matched, 2 tapholes are continuously tapped, the theoretical tapping amount of a single taphole is 3100t, the theoretical slag amount is 1800t, the target value of Si is 0.4, and the target time period from 5 months to 12 days to 18 days in 2020 (tables 4 to 5), and the blast furnace hearth state has the following characteristics:

a. in the target time period, the actual tapping quantity of the western iron notch is always smaller than the actual tapping quantity of other iron notches, and the actual difference value is more than 310 t.

b. In the target time period, the actual slag discharge amount of the iron notch is always smaller than the actual slag discharge amount of other iron notches, and the actual difference values are all more than 180 t.

c. In the target time period, the silicon content of the molten iron of the taphole is always smaller than that of other tapholes, and the actual difference is more than 0.04.

d. In the target time period, the temperature of the molten iron in the iron notch is always lower than the temperature of the molten iron in other iron notches, and the actual difference is more than 5 ℃.

e. In the target time period, the iron flow speed of the iron notch is obviously lower than that of other iron notches, and the actual difference value is more than 0.5 t/min.

f. In the target time period, the slag rate of the taphole is less than 0.9, and the slag rate of other tapholes is more than 0.9.

a) B), c), d), e) and f) are satisfied simultaneously, the operation of each taphole of the blast furnace is uneven. The characteristics of less iron tapping and slag discharging, low Si, low molten iron temperature, low iron flow, late slag generation and the like of a western iron notch exist all the time from 5 month and 12 days to 18 days in 2020, and the circumferential work of the furnace hearth has obvious difference and accords with the characteristic of uneven work of the furnace hearth.

And in the target time period, when the condition that one iron notch of the blast furnace works unevenly exists, repairing. The method comprises the following specific steps:

the blast furnace has the characteristics that the discharging speed of a west probe is slow on the probe, the west probe is about 50cm shallower than an east probe, the central temperature of a cross temperature measurement secondary is lower than the west temperature by more than 300 ℃ than the east temperature in the circumferential direction, and the temperature of a 36.659m cooling wall at the upper part of a furnace body is lower than the west temperature by about 30 ℃ than the east temperature.

In the time period, the depth of the taphole of the western taphole is shallow all the time, and the taphole depth maintenance of the western taphole can be improved by improving the stemming quality, increasing the stemming amount or increasing the training of a gunner, improving the gunner level and the like, so that the tapping slag amount of the western taphole is increased, and the circumferential working difference of a furnace hearth is reduced.

Furthermore, in the time period, the tapping frequency of the western iron notch is relatively low, and the tapping frequency of the western iron notch can be increased, so that the tapping slag quantity of the western iron notch is increased, and the circumferential working difference of the furnace hearth is reduced.

Furthermore, in the time period, the 2680 blast furnace adopts a parallel-tank bell-less furnace top all the time, and adopts a west-tank coke-east-tank ore distribution mode for a long time, so that the ore-coke ratio in the west direction (above a west iron notch) is easy to be large, the blanking speed is slow, and the chute reversing- (reversing + reladling) -reversing- (reversing + reladling) mode can be adopted to reduce the circumferential segregation of furnace burden on the furnace throat, thereby further improving the circumferential segregation of the working furnace cylinder.

Furthermore, in the time period, the distribution of the 2680 blast furnace tuyere and the coal injection lance distribution are relatively uniform in the east, west, south and north directions, and the tuyere distribution and the coal lance state distribution can be kept unchanged.

Table 42680 tapping and slag information table for blast furnace

TABLE 52680 tapping information table of blast furnace (continuation 1)