JPH0784610B2 - Blast furnace operation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for operating a blast furnace, and in particular, to a plurality of predetermined melting conditions for the softening cohesive zone shape of an ore layer formed in the blast furnace. Place it in a zone-shaped pattern,
Technology for determining the closest division pattern according to the furnace condition during daily operation or the change trend between it and the division pattern,
Further, the present invention relates to an operation guide technology for making the optimum cohesive zone shape according to the operation target of the blast furnace by utilizing the technology on-line and in real time, its operation technology, and comprehensive blast furnace operation technology.

[Conventional technology]

As is well known, the reaction mechanism in a furnace in a blast furnace is a complicated one in which chemical reaction, thermal reaction and physical phenomenon occur simultaneously. The elucidation work of the blast furnace reaction mechanism has been actively carried out with many measuring instruments installed (to the extent that it is commonly called the Oiran's hairpin), and has been gradually and partially elucidated. . And it is argued that there is a cohesive zone shape that controls the reduction state, ventilation state, unloading state, furnace heat state, etc. in the blast furnace globally and in the long term, and supports it with time. The number of people is increasing. Therefore, research and development of techniques for measuring and estimating the shape and position of the cohesive zone in the blast furnace are being vigorously continued. Among the technologies born in that, as a method of detecting the shape of the cohesive zone of the blast furnace during operation,
A method of calculating the gas component value in the radial direction with a furnace top sonde of the blast furnace disclosed in Japanese Patent Publication No. 56-30362, inputting the measured value, and calculating the shape of the cohesive zone by a predetermined mathematical model. . Alternatively, the temperature distribution in the circumferential direction and the height direction of the furnace wall of the blast furnace disclosed in Japanese Patent Publication No. 57-51443, and the heat load distribution are measured, and the position of the root of the cohesive zone is measured from the highest value of the measurement point. A method for detecting only such is known.

And, the detection information of the above-mentioned cohesive zone shape, along with signals from many other measuring instruments, attempts have been made to operate the blast furnace in consideration of the operator, so that the target cohesive zone shape is obtained. There is an operation method that determines the operating conditions (contents) of the blast furnace. However, since the shape of the cohesive zone cannot be directly visually observed by the operator, it is common that the shape of the cohesive zone has not yet reached a highly reliable level. Therefore, even now, efforts are being focused on research and development as analysis information for correctly grasping the cohesive zone shape, and the R & D seen from the blast furnace operation at the stage after the cohesive zone shape was correctly grasped. It is a situation that is only done in part.

[Problems to be Solved by the Invention]

The present inventors have installed a number of measuring instruments in the blast furnace and have been elucidating the reaction mechanism in the blast furnace for many years, and as a result, the blast furnace condition is the cohesive zone shape in the medium to long term. Therefore, we have come to the conviction that it is combined with short-term furnace heat conditions, extremely short-term conditions, and abnormal conditions.

And, instead of using the cohesive zone shape as analysis information for the mechanism inside the furnace, but continuing research and development from the blast furnace operation side, all of the above-mentioned conventional techniques are insufficient in accuracy due to lack of information. , It turned out that it cannot be used as it is.

The present invention, in the actual operation of the blast furnace, an operation technique for maintaining the optimum cohesive zone shape according to the online real-time operation of the blast furnace, and in the case of "deviation" from the optimum cohesive zone shape It is not only important to know the current overall shape of the cohesive zone as a prerequisite, but also to know the future trend of changes in the present cohesive zone. It is an object to reflect it in the operation technology of the cohesive zone shape.

[Means for Solving the Problem] The present invention, by knowing and managing the shape of the cohesive zone,
By determining the operating conditions such as modification of the cohesive zone shape and operating the blast furnace according to the operating conditions, it is possible to secure the flexibility of productivity and lower the fuel ratio while maintaining stable operation. , And to contribute to the development of comprehensive blast furnace operation technology.

The present invention solves the above problems and employs the following means.

The shape of the cohesive zone formed in the blast furnace is determined from the measurement values provided by the measuring device provided in the blast furnace, and the operating conditions of the blast furnace are determined so that the determined cohesive zone shape becomes the target cohesive zone shape. ,
In the method of operating the blast furnace based on the operating conditions,
By measuring the stave temperature at a plurality of points in the blast furnace height direction and the circumferential direction by the stave thermometer as the measuring device, at least the representative value of the shaft portion and the Bosch portion is calculated, and the representative value indicates the current fusion. A method for operating a blast furnace, characterized in that a band shape is selected from a predetermined fusion zone shape classification.

In addition to the shape of the cohesive zone selected by the stave temperature according to claim 1, the pressure inside the blast furnace is measured by a pressure gauge as the measuring instrument, and the pressure inside the furnace at the upper part, the middle part and the tuyere is measured, and the upper part of the furnace and the furnace The ventilation resistance index of the lower part is calculated, and from this calculated ventilation resistance index, the current cohesive zone shape is selected from the predetermined cohesive zone shapes, and the overall cohesive zone shape is combined by combining both cohesive zone shapes. A method of operating a blast furnace, characterized by determining

In addition to the shape of the cohesive zone selected by the stave temperature according to claim 1, the gas components in the blast furnaces are measured at a plurality of points in the blast furnace radial direction by a sonde as the measuring device, and the measured values are measured at least 3 in the blast furnace radial direction. Divide, calculate the carbon monoxide gas utilization rate from the representative value of each divided area, and select the current fusion zone shape from the predetermined fusion zone shape classification from this carbon monoxide gas utilization rate, A method for operating a blast furnace, which comprises determining a comprehensive cohesive zone shape by combining both cohesive zone shapes.

In addition to the cohesive zone shape determined by the combination of the stave temperature and the measured value of the furnace pressure in claim 2, the gas component in the blast furnaces is measured at a plurality of points in the radial direction of the blast furnace by a sonde as the measuring instrument. At least three divisions are made in the radial direction of the blast furnace from these measured values, the carbon monoxide gas utilization rate is calculated from the representative value of each divided area, and the present cohesive zone shape is predetermined from this carbon monoxide gas utilization rate. The method for operating a blast furnace is characterized by selecting from the cohesive zone shape classifications and combining both cohesive zone shapes to determine a comprehensive cohesive zone shape.

The shape of the cohesive zone formed in the blast furnace is determined from the measurement values provided by the measuring device provided in the blast furnace, and the operating conditions of the blast furnace are determined so that the determined cohesive zone shape becomes the target cohesive zone shape. ,
In the method of operating the blast furnace based on the operating conditions,
By measuring the stave temperature at a plurality of points in the blast furnace height direction and the circumferential direction by the stave thermometer as the measuring device, at least the representative value of the shaft portion and the Bosch portion is calculated, and at the time of the representative value and its representative value. A method for operating a blast furnace, characterized in that the present cohesive zone shape is selected from a predetermined cohesive zone shape section from a series change trend and a trend between the cohesive zone shape sections is determined.

In addition to the fusing zone shape selected according to the measured value of the stave temperature and the trend between the fusing zone shape sections according to claim 5, the pressure inside the blast furnace is measured by the pressure gauge as the measuring instrument. Is measured, and the ventilation resistance index of the furnace upper part and the furnace lower part is calculated from this measured value, and the present fusion band shape is determined by a predetermined fusion bonding from the calculated ventilation resistance index and the time series change trend of the ventilation resistance index. Select from the band shape categories and determine the trends between the cohesive zone shapes, and determine the overall cohesive zone shape and its trends by combining both cohesive zone shapes and the variations between the cohesive zone shapes. Blast furnace operation method characterized by.

In addition to the fusing zone shape selected according to the measured value of the stave temperature according to claim 5 and the trend between the fusing zone shape sections, the gas component in the blast furnaces is measured at a plurality of points in the blast furnace radial direction by a sonde as the measuring instrument. Then, the measured value is divided into at least three parts in the radial direction of the blast furnace, and the carbon monoxide gas utilization rate is calculated from the representative value of each divided area. From the calculated carbon monoxide gas utilization rate and its time series change trend, the fusion Select the cohesive zone shape from the predetermined cohesive zone shape sections, determine the trend between the cohesive zone shape sections, and combine both cohesive zone shapes and the fluctuations between the cohesive zone shape sections to create a comprehensive A method for operating a blast furnace, which comprises determining the shape of a cohesive zone and its trend.

In addition to the fusing zone shape determined by a combination of the measured values of the stave temperature and the furnace pressure of claim 6, and the trend between the fusing zone shape sections, the gas component in the blast furnaces is detected by a sonde as the measuring instrument. Measure multiple points in the radial direction of the blast furnace, divide the measurement value into at least three parts in the radial direction of the blast furnace, and calculate the carbon monoxide gas utilization rate from the representative value of each divided area. From the sequence change trend, the current cohesive zone shape is selected from the predetermined cohesive zone shape sections and the trend between the cohesive zone shape sections is determined, and both cohesive zone shapes and variations between the cohesive zone shape sections A method for operating a blast furnace, characterized in that the overall cohesive zone shape and its trend are determined by combining the above.

In addition to the trend between the cohesive zone shape sections determined by the combination of the measured values of the stave temperature and the pressure in the furnace according to claim 6, from the measured values of the sinter ore particle size and the coke particle size charged in the furnace, Obtain the average particle size, determine the trend between the cohesive zone shape categories from the time series trend of this average particle size, and combine the variation between both cohesive zone shape categories to obtain a comprehensive cohesive zone shape category A method for operating a blast furnace, characterized by determining trends.

In addition to the trend between cohesive zone shapes determined by the combination of stave temperature, furnace pressure and carbon monoxide gas utilization rate according to claim 8, measurement of sinter ore particle size and coke particle size to be charged into the furnace Calculate the average particle size from the values, determine the trend between the cohesive zone shape categories from the time series trend of this average particle size, and combine the variation between both cohesive zone shape categories to obtain a comprehensive cohesive zone. A method for operating a blast furnace, which is characterized by determining trends between shape categories.

The blast furnace according to any one of claims 1 to 10, characterized in that the final judgment and operation conditions corresponding to the predetermined judgment are displayed to the operator, and the blast furnace is operated in consideration of the display. Operating method.

The blast furnace is operated according to a predetermined operating condition corresponding to the final determination.
A method for operating a blast furnace according to any one of 1.

The operating condition corresponding to the final determination and the predetermined determination is corrected based on the operating condition taken in the past and displayed to the operator, and the blast furnace is operated in consideration of the display. Item 11. A method for operating a blast furnace according to any one of items 1 to 10.

The final judgment and predetermined operating conditions corresponding to the judgment are corrected and displayed to the operator according to each mode based on planned downwind, precipitation, raw material abnormality, equipment failure, etc., and the display is considered. 11. The method for operating a blast furnace according to claim 1, wherein the blast furnace is operated as a result.

[Action]

The operation of the present invention will be described with reference to FIGS. 3 and 4. When the operator thinks about the operation technology of the blast furnace and investigates the work, the blast furnace operation performed by the operator grasps phenomena such as reducing state, ventilation state, unloading state, furnace heat state, etc. In order to stabilize the operation, we set the operation management items and operation conditions so that the optimum condition is achieved with respect to the operation target, and perform the operation management.

Next, the present inventors examined the relationship between various measured values-cohesive zone shape-operating conditions, which is the first problem in the operation technique after grasping the cohesive zone shape.

Specifically, the measured values of the operation management items when the reactor conditions are favorable are divided into levels (current values) and time-series trends (difference between current values and past values) as standard values, and each measured value is melted. A target cohesive zone shape is determined and set using the characteristics given to the cohesive zone shape, and measured values of various furnace conditions are compared with their reference values, and the cohesive zone shape is estimated from the "deviation" characteristic. Then, the relationship between the target cohesive zone shape and the operation condition for bringing the target cohesive zone shape closer to the target cohesive zone shape from the “deviation” characteristic is summarized as “five or more and currently 20 or less” fusion bonding. We obtained the finding that it is desirable to place the pattern in a band shape. Then, during daily operation, each measured value is detected in real time, and the one that matches the pre-patterned cohesive zone shape from each level or level and time series trend is selected as the closest division pattern, Select the operation condition that has been set from the "deviation" characteristic of the cohesive zone shape in advance, and display the contents to the operator,
It has been found desirable to operate the blast furnace according to its operating conditions. The level reference value is used to estimate the current cohesive zone shape, and the time series trend reference value is used to estimate how the current cohesive zone shape will change in the future. It is possible to confirm that not only the cohesive zone shape of No. 1 but also the current cohesive zone shape will be changed in the future can be determined more accurately. It was Therefore, this time series trend reference value is also used.

One typical example of the above-mentioned cohesive zone shape section is that the cohesive zone shape is divided into an upper portion and a lower portion, which are divided into high, middle, and low, respectively, as shown in FIG. There are 16 categories that are obtained by dividing the half-width value of the shape into two stages, and intermediate categories that are some of them integrated.

Then, depending on the operating conditions of the blast furnace, one of these sections is determined as the target cohesive zone shape (Fig. 4 (a) for high production and low fuel ratio, and the first for low production and low fuel ratio). 4 (g) is the target cohesive zone), and the operating conditions are determined in advance based on the analysis result of past operation information according to the "deviation" characteristic between the target cohesive zone shape and each cohesive zone classification. To be done. For example, in the case of an extremely bad cohesive zone shape classification, it is not always necessary to suddenly determine the operating conditions that approach the target cohesive zone shape. When the shape is classified, the operating condition for approaching the target cohesive zone shape may be determined.

As described above, the cohesive zone shapes are divided into at least 5 or more, which are pre-segmented according to the levels of various measured values and / or time series trends as shown in FIG. Judgment of which category of
The operation condition is determined based on the "deviation" characteristic from the target cohesive zone classification.

However, since there is a large delay time (about 20 to 70 hours) from the time when the cohesive zone shape changes to the end after the operation action is taken, that is, there is a time between the operation timing and the reaction occurrence, consider this. It is desirable to determine the operating conditions.

The time delay characteristic of the blast furnace also affects the timing of executing the operating condition according to the determination result. If the time delay characteristic is not taken into consideration, the same operation condition will be set for each subsequent judgment made during the large delay time until the effect of the operation condition executed by the judgment based on the measured value at a certain time comes out. Since it will be repeatedly executed, when the effect begins after the large delay time has passed,
After that, the number of times of execution becomes a positive feedback loop that causes an excessive effect, which causes a divergence phenomenon.
Therefore, when the operation condition is changed according to the determination result, it is not appropriate unless it is determined in consideration of the operation content in the past delay time. Furthermore, there are various modes in the operation of the blast furnace, such as a dormant state, a reduced wind state, a heavy rain state, a peculiar state of raw materials, and a failure state of equipment, and make it possible to recognize the states that are strongly affected by them. Be careful
If the final (or executed) operating condition is corrected according to the mode, the applicable range of the present invention can be extended not only to the steady state but also to almost the entire period.

Now, the second subject of the present invention is to be formed in the present blast furnace based on the measured values from various present measuring instruments from the section of the cohesive zone shape determined by the operating side. The technology for determining the shape of the cohesive zone to which the cohesive zone shape belongs has been studied for many years. As a result, it was confirmed that the following measured values are closely related to the shape of the cohesive zone.

Stave temperature in the height direction of the blast furnace wall ... [Stave thermometer] In-furnace pressure in the height direction of the blast furnace wall ... [Inner pressure gauge] Radial sonde information (gas analysis value or temperature in the blast furnace section) Etc.) [Sonde measuring device] Sintered ore particle size and coke particle size [Sieve or particle size distribution meter, not shown] Fig. 3 shows the positional relationship between them in the blast furnace.

It was found that among them are related to both the present value of the cohesive zone shape and the time series variation, and are related to the time series variation of the cohesive zone shape.

Next, as a result of investigating the reliability of the measured values and the response time characteristics with changes in operating conditions, and the like, and examining the measured values having a strong relationship with the cohesive zone shape, the stave temperature of the blast furnace furnace wall is It was found to be the first. The stave temperature is an average value in the circumferential direction at the same height of the blast furnace, and in the height direction, it is determined in consideration of the shape of the cohesive zone. In the case of the division by, the two representative values, that is, the upper and lower representative values, may be calculated, and in the case of the upper, middle, and lower divisions, three representative values may be calculated.

As part 1 of the blast furnace operation technology that combines the above findings, the stave temperature is measured by the stave thermometer groups T _S and T _B provided on the blast furnace wall, and representative values at multiple points in the height direction are calculated. The determination based on the representative value or a combination of the representative value and its time series trend will be described. As is well known, the cohesive zone of ore in the blast furnace has a very low porosity and impedes the passage of gas in the furnace, so that the gas in the furnace selectively flows laterally through the slit coke layer and heats the furnace wall. The amount of movement increases. It is known that if the amount of heat transfer increases too much, the measured value of the stave temperature in the vicinity thereof becomes high. Speaking this in relation to the cohesive zone shape, when the measured value of the shaft stave temperature becomes high, the softening fusion start site of the ores moves upward, and the cohesive zone external shape L _G Is estimated to be approaching the furnace wall. Moreover, when the measured value of the Bosch stave temperature becomes low, it can be estimated that the cohesive zone root L _K is located in the vicinity thereof. It has been empirically found that when the shaft stave temperature is high, there is no case where the Bosch stave temperature drops extremely, and conversely, when the shaft stave temperature is low, there are many cases where the Bosch stave temperature drops. ing. Utilizing this new knowledge, the present cohesive zone shape or it and its change trend are judged. That is, when the shaft portion stave temperature is high and the Bosch portion stave temperature is low, the upper part from the center of the cohesive zone is closer to the furnace wall side, and the cohesive zone root L _K position is located at the Bosch portion B. There is. Therefore, the shape of the cohesive zone can be determined to be "hot head cold type" shown in FIG. 4 (f). In addition, the change trend of the cohesive zone shape is determined by calculating the positional relationship between the installation locations of the stave thermometers T _S and T _B and the time series trend of the measured values, that is, the level difference between the past measured value and the present measured value. To do.
In this case, for example, the positional relationship between the installation positions of the stave thermometers T _S and T _B will be explained. Since the shaft part stave temperature is high, the heating condition of the ores is good, and the cohesive zone is in the upward moving direction. Of course, the cohesive zone root position is also in the direction of moving upward. Therefore, the trend of changes in the shape of the cohesive zone is shown in Fig. 4 (f) from "head heat foot cold type" to Fig. 4 (c).
It is judged to be a change to the "head heat foot heat type" shown in. As shown in FIGS. 4 (c) and 4 (f), the change trend of the cohesive zone shape has a considerable “deviation” from the target cohesive zone shape (also referred to as a management type) shown in FIG. 4 (a). I understand. Based on this determination result, it is necessary to protect the furnace body, suppress the heat dissipated in the furnace body, and the like as operating conditions, and when the raw fuel is charged in batches from the upper part of the furnace, the particle size is relatively large ( Select an operation operation (hereinafter simply referred to as increasing coke kick ratio) in which coke having better air permeability is deposited on the center side of the furnace, and determine the execution timing in consideration of past operation content and operation mode. Then, a message is displayed to the operator, and the blast furnace can be operated according to the contents of the operation.

The final decision of the operation amount and the execution timing of the operation condition in consideration of the past operation content and operation mode may be performed by the operator after the display.

Of the measurement values deeply related to the shape of the cohesive zone, the second is the pressure value in the furnace in the height direction of the blast furnace, and the pressure value is the average value in the circumferential direction at almost the same height of the blast furnace. Using, calculate the ventilation resistance index in the height direction of the blast furnace, and this calculated ventilation resistance index,
It is determined in consideration of the above-mentioned fusion zone shape division pattern, and when the division is the upper and lower two divisions, the ventilation resistance index in the upper and lower portions is determined by using the furnace pressure values in the upper, middle and lower portions. Calculate and use. When this ventilation resistance index is used in combination with the first in-furnace stave temperature, the accuracy of the selection determination of the cohesive zone shape sections and / or the determination of the change trend between the cohesive zone shape sections can be improved. confirmed. That is, the pressure of each part is measured with the pressure gauges P _S1 , P _S2 , and P _H provided on the upper, middle, and tuyere of the blast furnace wall, and the ventilation resistance index of the upper and lower parts of the furnace is calculated from the measured values. The determination based on the current value of the ventilation resistance index or a combination of the current value and the time series trend will be described. Empirically, if the value of the ventilation resistance index in the upper part of the furnace is large, the measured values of the shaft pressure and stave temperature near the upper part of the furnace fluctuate greatly, and conversely, if the value of the ventilation resistance index is small, the measured values of the shaft pressure and stave temperature. Is stable and low. On the other hand, in the lower part of the furnace, if the value of the ventilation resistance index is large, the measured value of the shaft pressure near the middle part of the furnace is low and stable, the measured value of the stave temperature of the lower part of the furnace is low, and the pressure of the tuyere The measured value of is higher and the fluctuation is a little larger. On the contrary, it has been found that when the value of the ventilation resistance index is small, the measured value of the stave temperature particularly in the lower part of the furnace, especially in the Bosch part, is often high. Utilizing this new knowledge, the present cohesive zone shape or it and its change trend are judged. That is, when the value of the ventilation resistance index of the upper part of the furnace is large and the value of the ventilation resistance index of the lower part of the furnace is also large, the upper part from the center of the cohesive zone is closer to the furnace wall side, and the cohesive zone root part L _K
The position is near the Bosch portion B. Therefore, the shape of the cohesive zone can be determined to be "hot head cold type" shown in FIG. 4 (f). The change trend of the cohesive zone shape is determined by calculating the time series trend of the measured values, that is, the level difference between the past measured value and the present measured value. In this case, if the level difference in the ventilation resistance index in the upper part of the furnace is "absent" and the difference in the level in the ventilation resistance index in the lower part of the furnace is "decreased", the change trend of the cohesive zone shape is It is estimated that the banding shape changes from "head heat foot cold type" to "head heat foot heat type". As shown in FIGS. 4 (c) and 4 (f), it is understood that the change trend of the cohesive zone shape has a considerable “deviation” from the target cohesive zone shape shown in FIG. 4 (a). Based on the comprehensive determination result obtained by combining the selection result based on the stave temperature of the No. 1 with the selection result, the operation content is “increasing the coke kick ratio” from the viewpoint of furnace body protection, furnace body heat dissipation suppression, etc. The execution timing is determined in consideration of past operation contents and operation modes. Then, a message is displayed to the operator, and the blast furnace can be operated according to the contents of the operation.

By the way, among the measured values deeply related to the shape of the cohesive zone, the third
The figure shows the gas components (CO and CO
₂ ) Analytical value and / or measured value of gas or raw material temperature distribution in the furnace in the radial direction. The measured value in the radial direction should be divided into at least 3 in consideration of the above-mentioned cohesive zone shape section, and the measurement interval cannot be shortened because it must be inserted into the furnace by using a sonde. If there is a deviation in the radial direction and it becomes a disturbance, similar to the pressure value in the furnace described above, the determination of the cohesive zone shape from this measurement value It is used in combination with the selection result to select an operation condition, and the execution timing is determined in consideration of past operation contents and the like. The operator may be allowed to determine the execution timing.

The above-mentioned sondes are a furnace top sonde Z _{T at the} top of the blast furnace, a shaft sonde Z _{S at} the upper, middle and lower parts of the shaft, and a belly sonde at the furnace belly.

Therefore, as part 3, the radial direction measurement value (CO, CO ₂ or temperature) of the shaft sonde Z _S should be divided into at least three parts in the radial direction, and the representative value of each divided area or its representative value and its time series trend. The determination based on the combination will be described. From the gas component values CO and CO ₂ , the CO gas utilization rate (hereinafter ηCO
Call) and use that value. As a conventional knowledge, when the position of the entire cohesive zone is low, the lumpy zone region Y expands, so that the contact time of the gas and the charge increases, and the ηCO of the entire blast furnace increases.
Is known to improve. Empirically shaft probe
From the η CO distribution in the radial direction of Z _S , η near the center of the furnace in the radial direction
When CO is high and ηCO near the periphery is low, the measured stave temperature in the Bosch part B is high, and when ηCO near the center in the radial direction of the furnace is low and ηCO near the periphery is extremely low, the shaft part It has been found that in many cases, the measured values of the stave temperature of S and the Bosch portion B both show high temperatures.
Utilizing this new knowledge, the present cohesive zone shape or it and its change trend are judged. ΗCO near the periphery in the furnace radial direction
Is low and ηCO near the center is high, the lower part from the center of the cohesive zone is closer to the furnace wall side, and the upper part of the cohesive zone is far from the furnace wall. Therefore, the present cohesive zone shape is the fourth
It can be determined to be a "head cold foot type" shown in FIG. Further, the change trend of the cohesive zone shape is estimated by calculating the level difference between the past measured value and the present measured value. In this case, the level difference of ηCO near the center in the furnace radial direction “decreases”, and ηCO near the periphery is reduced.
If there is no level difference, the change trend of the cohesive zone shape is from the cohesive zone shape of "head cold foot thermal type" to "head hot foot thermal type"
Change is estimated. As shown in FIG. 4 (c), the tendency of the change in the cohesive zone shape is a considerable “deviation” from the target cohesive zone shape.
I know that there is. Based on the comprehensive determination result obtained by combining the determination result of the 1 or 2 with the determination result, the operation content is “increasing the coke kick ratio” from the viewpoint of protection of the furnace body, suppression of heat dissipation of the furnace body, etc. The execution timing is determined in the same manner as the second case. Then, a message is displayed to the operator, and the blast furnace can be operated according to the contents of the operation.

Now, fourthly, in the charged raw fuel information, in particular, the values of the sinter particle size and the coke particle size change as the charged raw material whose particle size changes approaches the position of the cohesive zone shape. It was confirmed that it would greatly influence the trend. Therefore, the change trend of the cohesive zone shape classification is judged from those particle size measurement values, and the judgment results of the above 1 to 3 are combined to obtain the comprehensive judgment result, and the operation condition is selected from the comprehensive judgment result. Then, the execution timing is determined in the same manner as the above-mentioned No. 2.

That is, a description will be given of the determination based on the particle size status value obtained by obtaining the respective average particle sizes from the measured values of the sinter particle size and the coke particle size and determining the average particle size combination. Empirically, the particle size condition value and the measured values of the stave temperature of the shaft portion S and the Bosch portion B have a positive correlation. Using this new knowledge, we will estimate the trend of changes in the cohesive zone. For example, if the particle size status value is higher than the reference value, the measured value of the stave temperature is often made to the shaft portion S and the Bosch part B together hot trends, external shape L _G of the cohesive zone in the furnace wall side It is estimated that it will approach. Moreover, the ηCO of the entire blast furnace tends to fluctuate greatly, and the level tends to increase, and it is estimated that the flow of ore into the middle and near the center of the furnace. Also, if the particle size situation value is lower than the reference value, the measured value of the stave temperature tends to be a low temperature trend in both the shaft portion and the Bosch portion, and the external shape L _G of the cohesive zone is far from the furnace wall, It is estimated that the root L _K position of the cohesive zone moves downward and is located near the Bosch portion B. In addition, the ηCO of the entire blast furnace has small fluctuations, and the level tends to be down, and it is estimated that the ore deposits in the vicinity of the furnace and the inflow to the middle of the furnace and the vicinity of the center decrease.
Based on this idea, the particle size situation value is classified into the standard, out of the upper limit, and out of the lower limit, and "previously good flow of ore into the middle of the furnace and near the center""premature failure of flow of ore into the middle of the furnace and near the center" Put it in a pattern in three stages of "within the standard". The operation contents and the like are selected by the comprehensive judgment by combining the judgment results of No. 2 and No. 3, and the execution timing is decided similarly to No. 2.

Further, there is also a total combination in which the combination of 1, 2, and 3 and the combination thereof is further combined with 4.

FIG. 2 is a summary of the above-mentioned techniques for determining the cohesive zone shape and / or determining the change trend between the cohesive zone shape sections. The judgment technology flows from left to right,
First, signal processing is performed from the measurement value on the left to convert it to intermediate information,
The above determination is performed from the intermediate information, and the determination results are combined to make a comprehensive determination based on the determination information.
However, the measured value of the particle size of the raw fuel can be determined only by the change trend between the cohesive zone shape sections, so Part 2 and Part 5
Combined with the judgment of No.4, the total judgment is made and 4 is obtained.
The fifth is a comprehensive judgment that combines judgment based on stave temperature, judgment based on furnace pressure and judgment based on sonde information.

FIG. 1 is a flow chart of the present invention.
Since the processes up to F are the determination techniques shown in FIG. 2, duplicate description will be avoided and omitted. F is means for determining the overall judgment F by combining the first judgment C and D with the second and subsequent judgments E. Specifically, the judgments are integrated by using weighting characteristics.
As an example, C is "head heat foot heat type", D is "head heat foot heat type continuation", E is "head heat foot cold type", trend is "head heat foot cold type → head heat" If the weighting characteristics are equal, the present condition of F is that head is equal to head heat and foot equals foot heat and foot cold to become “head heat type”. The increase in foot heat is averaged as "Continued" and the overall judgment is "Continued head heat type". Further, if the weighting characteristics are changed, the comprehensive judgment naturally changes. G is an operation condition (also referred to as operation content) for blast furnace operation which is read from, for example, a predetermined table based on the comprehensive determination of F. In I, the execution timing of the G operating condition is determined based on the autonomous characteristics of the blast furnace, and the operating condition is also taken into consideration to correct the determination and finally determine the operating condition. J displays the final result of I to the operator and provides it as basic information for the operator to operate the blast furnace, and the operator further considers other information to determine the operation content and timing to be executed, Do it. In addition, other information can also be taken in, and if the other information is no longer important, the blast furnace can be automatically operated without an operator. In this case, limiting the range of the operation end is also an effective method.

Further, as the operating condition of the blast furnace, the case where the coke kick ratio is changed has been described, but the present invention is not limited to this, and when the raw fuel is charged batchwise from the upper part of the furnace, the particle size comparison is performed. "Coke ratio" that adjusts the distribution of ore of relatively small (poor air permeability) in the furnace radial direction, and "Coke that adjusts the distribution of charge in the furnace radial direction by increasing or decreasing the amount of coke charged at one time" By adjusting the "base", "adjusting the furnace top pressure" to adjust the ventilation, "adjusting the ventilation conditions" such as air volume and air humidity related to the ventilation, and changing the falling trajectory of the charge. "Adjustment of charge stock line (surface level)" that will change the distribution of ore and coke in the furnace, charging order when charging ore and coke in batch (coke, coke, ore, ore Changing) And more will change the ore and furnace distribution of coke "the charging mode adjustment" may be carried out alone or in combination.

Further, as means for embodying the above operating method, it is appropriate to use a computer, a programmable sequencer or a control microcomputer, and program in a computer language, that is, FORTRAN or PL-1 high-level language. There is a system in which a system and an expert system are introduced and the above-mentioned comprehensive judgment rule is created as a knowledge base to make inference judgment.

〔Example〕

As Example 1, the stave temperature was measured by stave thermometers T _S and T _B provided in the circumferential direction and the height direction of the blast furnace wall, and the shaft portion S and the Bosch B in the height direction were measured.
Table 1 shows an example of calculating the representative value of the points and selecting the cohesive zone shape from the representative value. From the measured values of the plurality of stave temperatures, the measured value of the shaft portion and the measured value of the Bosch portion are used as the representative values to determine the current cohesive zone shape. At this time, the standard value of the stave temperature level of the target cohesive zone is set to the upper limit of 250 ° C and the lower limit of 150 ° C for the shaft and the upper limit of 110 for the Bosch part.
℃, lower limit 60 ℃.

The current operating performance value of the shaft portion is 260 ° C., the current operating performance value of the Bosch portion is 120 ° C., and the level determination results are both “out of upper limit”, that is, the stave temperature of the target cohesive zone or higher. Therefore, the "head heat foot heat type" shown in FIG. 4 (c) is selected as the current shape of the cohesive zone from among the previously classified cohesive zone shapes. The operation content is set in advance according to the "deviation" characteristic of the cohesive zone shape from the operation content "head heat foot thermal type" and the "deviation" characteristic of the target cohesive zone shape, that is, furnace body protection, furnace body release. “Coke kick ratio 7
% Increase ”. The judgment results are displayed to the operator, and the blast furnace is operated according to the contents of the operation. If necessary, the past determination of the operation content may be included in consideration of past data of the operation content, or the operator may be allowed to include it.

As an example thereof 2, the upper portion of the blast furnace wall, to measure the furnace pressure at the pressure gauge P _S1 provided in the central and tuyere, P _S2, P _H, the ventilation resistance index of the furnace top and lower part of the furnace from the measured value Table 2 shows an example in which the cohesive zone shape is selected from the comprehensive determination result obtained by calculating the above-mentioned determination result of Example 1 and the determination result of the present value of the ventilation resistance index. As shown in Table 2, the current cohesive zone shape is determined using the ventilation resistance index in the upper part of the furnace and the ventilation resistance index in the lower part of the furnace. The level judgment reference value of the target cohesive zone ventilation resistance index is the upper limit of the ventilation resistance index of the furnace upper part 0.45, the lower limit value
0.30, the ventilation resistance index of the lower part of the furnace is 1.70 upper limit, lower limit
Set to 1.40.

First, the current value of the ventilation resistance index in the upper part of the blast furnace is 0.47, the current value of the ventilation resistance index in the lower part of the furnace is 1.80, and the level determination results are both "outside the upper limit". Therefore, it is determined that the current cohesive zone shape is “head hot-foot cold type” (FIG. 4 (f)) from among the previously classified cohesive zone shapes.

Furthermore, by combining this determination result with the determination result of Example 1, the overall determination based on the preset weighting characteristics indicates that the cohesive zone shapes are matched and the "head heat" shown in FIG. Type ".

The operation content set in advance from the "deviation" characteristic of the cohesive zone shape is "head heat type" and the "deviation" characteristic of the target cohesive zone shape,
That is, the coke kicking ratio is increased by 3% from the viewpoint of preventing the furnace upper stave temperature from increasing. These judgment results are displayed to the operator, and the blast furnace is operated according to the contents of the operation.

As Example 3, an example in which the radial direction measurement value (CO, CO ₂ ) of the shaft sonde Z _S is divided into at least three in the radial direction and estimation is performed from the determination result of the representative value of each divided area is shown in Table 3
Shown in. CO and C in the gas components in the furnace by the shaft probe Z _S
The amount of O ₂ was measured at 8 points in the radial direction of the blast furnace, and the measured value was divided into 3 in the blast furnace radial direction, that is, near the furnace, near the middle of the furnace, and near the center of the furnace, and ηCO was calculated from the representative measured values of each. The present cohesive zone shape is judged by this calculated ηCO value. At this time, the reference values for the ηCO level of the target cohesive zone are 52% upper limit and 45% lower limit near the furnace, 54% upper limit and 50% lower limit in the middle of the furnace, and upper limit near the center of the furnace. 20% and lower limit 5%.

First, the current value in the vicinity of the furnace is 50% and the level judgment result is “within the standard”. The current value in the middle of the furnace is 48% and the level judgment is “out of the lower limit”, and the current value in the vicinity of the furnace center is 3%. The level determination result is “out of lower limit”. Therefore, the "head-heat type" (Fig. 4 (g)) shown in Fig. 4 (b) is selected as the present cohesive band shape from the previously divided cohesive band shapes. Furthermore, by combining this determination result and the overall determination result of the second embodiment, the "head heat type" is determined as a match from the cohesive zone shape sections by the overall determination based on the weighting characteristics. Further, the operation content preset from the "deviation" characteristic of the cohesive zone shape is "head heat type" of the cohesive zone shape and "deviation" characteristic of the target cohesive zone shape, that is, the furnace upper stave temperature high temperature. Select "coke kick ratio increase by 3%" from the viewpoint of preventing liquefaction. In addition to this selection, “quiet watching” is finally determined in consideration of past operation content and operation mode, the determination result is displayed to the operator, and the operation of the blast furnace is performed according to the operation content.

As Example 4, the stave temperature of the furnace wall of the blast furnace was measured, and representative values of a plurality of points in the height direction and the circumferential direction were calculated,
Table 4 shows an example of judgment based on the combination of the representative value and the time series trend of the representative value. As shown in Table 4, the measured values of the stave temperature are used as the representative values of the shaft portion measurement value and the Bosch portion measurement value, and the trend of the change in the cohesive zone shape due to the level difference between the present value and the past value. To judge. The standard value for the stave temperature level of the target cohesive zone is 250 ° C for the shaft and 150 ° C for the shaft, and 110 for the Bosch.
℃, lower limit 60 ℃. Also, the time series trend judgment reference values are ΔT = + 10 ° C and ΔT = -10 ° C for the shaft part, and ΔT = + 5 ° C and ΔT = -5 ° C for the Bosch part.

First, the current value of the shaft portion is 260 ° C., the current value of the Bosch portion is 120 ° C., and the stave temperature level determination results of the target cohesive zone are both “out of upper limit”. Therefore, the "head heat foot heat type" shown in FIG. 4 (c) is selected as the current shape of the cohesive zone from among the previously classified cohesive zone shapes.

Next, if the level difference ΔT between the current value and the past value of the shaft portion S is within ± 10 ° C, the current cohesive zone shape is continued, and the change in the cohesive zone shape is judged to be more than that. For example, it is judged that the head heat direction has changed, and if it is less than that, it is judged that the head heat direction has changed. In the Bosch part B,
If the level difference ΔT is within ± 5 ° C, the current cohesive zone shape is continued, and if it is more than that, it changes to the foot heat type direction, and if it is more than that, it goes to the foot cold type direction. It is judged that it is fluctuating. That is, in this example, the stave temperature level difference ΔT of the shaft portion S is + 3 ° C., and the Bosch portion B is
The level difference ΔT thereof is + 4 ° C., and the determination results of the time series trends are both “within the standard”. Therefore, while considering the positional relationship of the installation parts of the stave thermometers T _S and T _B as the change trend between the sections of the cohesive zone shape that have been patterned in advance, the “head heat foot thermal type From "," it is determined as "head heat foot heat type", that is, "head heat foot heat type continues". The operation content is set in advance from the "deviation" characteristic of the cohesive zone shape from the operation content "continuation of head heat foot thermal type" and the "deviation" characteristic of the target cohesive zone shape, that is, furnace body protection, furnace Select “Coke kick ratio increase of 7%” from the viewpoint of suppressing body heat dissipation. These judgment results are displayed to the operator as a comprehensive judgment, and the blast furnace is operated according to the operation contents.

As Example 5, the pressure inside the furnace was measured with pressure gauges P _S1 , P _S2 , and P _H provided at the upper part, the middle part, and the tuyeres of the furnace wall of the blast furnace, and the ventilation resistance of the upper part and the lower part of the furnace was determined from the measured values. An example in which the index is calculated and estimated from the combination of the present value of the ventilation resistance index and the combination determination result of the time series trend thereof and Example 4 will be described in Table 5. As shown in Table 5, using the ventilation resistance index of the upper part of the furnace and the ventilation resistance index of the lower part of the furnace, the current cohesive zone shape is selected with the current value, and the level difference ΔU between the current value and the past value is selected.
The change trend of the cohesive zone shape is determined by K and ΔLK. The upper limit of the ventilation resistance index of the furnace is 0.45 and the lower limit is 0.30, and the ventilation resistance index of the lower part of the furnace is the upper limit of 1.70 and the lower limit of 1.40. Also, the time series trend judgment reference value is the level difference ΔUK,
Set both ΔLK to +0.03 to −0.03.

First, the current value of the ventilation resistance index in the upper part of the furnace is 0.4 and the current value of the ventilation resistance index in the lower part of the furnace is 1.80, and both the level determination results are “out of upper limit”. Therefore, it is determined that the current cohesive zone shape among the pre-separated cohesive zone shapes is "head heat foot cold type" shown in FIG. 4 (f).

Next, the change trend of the cohesive zone shape is judged as the level difference ΔUK between the current value and the past value of the ventilation resistance index at the upper part of the furnace is +0.02, and the judgment result of the time series trend is “within the standard” When the level difference ΔLK of −0.05 is −0.05, the determination result of the time series trend is “decrease”. From the pre-separated cohesive zone shape, the change trend between the sections of the cohesive zone shape is determined to be "head heat foot cold type" to "head heat type". Furthermore, this determination result and the example 4
The determination results are combined and the overall determination based on the weighting characteristics is used to determine a match among the sections of the cohesive zone shape, and the operation content is selected according to the determination. The judgment is the result of the judgment of Example 4 "continuation of head heat foot heat type"
Based on the combination of the weighting characteristics of “the head heat foot cold type → head heat type”, which is the current determination, a comprehensive determination is made as “continuation of the head heat type” shown in FIG. 4 (b). It can be presumed that the operation content set in advance from the "deviation" characteristic of the cohesive zone shape is that the change trend of the cohesive zone shape is approaching the target cohesive zone shape,
Select "Waiting". These judgment results are displayed to the operator as a comprehensive judgment, and the blast furnace is operated according to the contents of the operation.

As a sixth example, the radial direction measurement value (CO, CO ₂ ) of the shaft sonde Z _S is divided into at least three in the radial direction, and the representative value of each divided area and the combination determination result of the time series trend of the representative value are determined. Table 6 describes an example inferred from a combination of the determination result of Example 5 and Example 5. As shown in Table 6, (in this embodiment, ηCO is calculated from CO and CO ₂ of gas component values, and the value is used). Radial measurement values of the shaft sonde Z _S are measured near the furnace, near the middle of the furnace, and near the furnace. It divides into 3 near the center and each measured value is used. The change trend of the cohesive zone shape is judged by the present value and the present cohesive zone shape and the level difference ΔηCO between the present value and the past value. The upper limit of the level judgment reference value is 52% near the furnace and the lower limit is 45%. The upper limit is 54 near the middle of the furnace.
%, The lower limit value is 50%, and the upper limit value is 20% and the lower limit value is 5% near the center of the furnace. The time series trend judgment reference values are ΔηCO = + 0.2% to ΔηCO = -0.2% near the furnace, ΔηCO = + 0.3% to ΔηCO = -0.3% near the furnace, and ΔηCO = +0 near the furnace center. 5% to ΔηCO = -0.5% is set.

First, the current value ηCO near the furnace is 50.0% and the level judgment result is “within the standard”, and the current value ηCO near the middle of the furnace is 48.9%.
The level judgment is “outside of the lower limit”, and η is the current value near the center of the furnace.
When CO is 3.0%, the level judgment result is "below the lower limit". Therefore, it is determined that the current cohesive zone shape is "head heat type" from among the preliminarily classified cohesive zone shapes. Next, the change trend judgment of the cohesive zone shape is that the level difference ΔηCO between the present value and the past value near the furnace is −0.3%, and the judgment result of the time series trend is “decrease”. ΔηCO is −0.1
In%, the determination result of the time series trend is “within the standard”, and when the level difference ΔηCO near the center of the reactor is ± 0%, the determination result of the time series trend is “within the standard”. Therefore, it is determined from "head heat type" to "head heat foot heat type" as the change tendency between the sections of the cohesive zone shape among the previously divided cohesive zone shapes.

Further, by combining this determination result and the determination result of the fifth embodiment, a comprehensive determination based on the weighting characteristics is used to determine a match from the cohesive zone shape categories, and the operation content is selected according to the determination. Specifically, the determination is newly performed by a combination of weighting characteristics of “continuation of head heat type” which is the determination result of Example 5 and “head heat type → head heat foot type” which is the current judgment. It is judged comprehensively as "continuation of head heat foot heat type". The operation content preset from the "deviation" characteristic of the cohesive zone shape is "head heat foot thermal type" of the change trend of the cohesive zone shape and the "deviation" characteristic of the target cohesive zone shape, that is, the furnace body. From the viewpoints of protection and suppression of heat dissipation from the furnace body, select "increasing coke kick ratio".

Next, when the operation content information in the past was checked, the same operation content was being executed at the time of the determination twice before, and thus the final determination was made as a wait-and-see in this determination. The final judgment result is displayed as a comprehensive judgment to the operator, and the blast furnace is operated according to the contents of the operation.

As Example 7 of the judgment result of the particle size situation value obtained by obtaining the average particle size from the measured values of the sinter particle size and the coke particle size and the combination of the average particle size and the judgment result of Example 5 Examples estimated from the combination will be described in Table 7. As shown in Table 7, using the particle size status value, the change trend between the cohesive zone sections is determined based on the current value. The level judgment reference value is set to an upper limit value of 30.0 and a lower limit value of 28.0.

First, the current value of the particle size situation value ((sintered ore average particle size / coke average particle size) × 100) is 27.0, and the level determination result is “out of the lower limit”. Therefore, the outer shape of the cohesive zone tends to move away from the furnace wall due to the deposition of ore near the furnace, that is, the decrease in the flow into the middle and near the center of the furnace, and the root of the cohesive zone is located near the Bosch part. Tends to move downwards. As the determination result of the change tendency of the cohesive zone, "poor inflow of the ore into the middle of the furnace or near the center" is selected from among the aforementioned change trends of the cohesive zone.

Next, by combining this determination result and the determination result of the fifth embodiment, a matching determination is made from the cohesive zone shape division patterns by the overall determination based on the weighting, and the operation content is selected according to the determination. Specifically, the determination is newly made by a combination of the weighting characteristics of the determination result of Example 5 “continuation of head heat type” and the determination of this time “poor inflow of ore into the middle of the furnace, near the center”. The overall judgment is "Head heat type → Head heat foot cold type". The "coupling" of the previously fused band shape
From the viewpoint of preventing lowering of the measured temperature of the furnace lower stave temperature, select "Increase ore kick ratio" as the operation content set from the characteristics. These judgment results are displayed to the operator as a comprehensive judgment, the operator checks the operation contents in the past to make a final decision, and operates the blast furnace according to the operation contents.

As Example 8, an example in which the average particle size is obtained from the measured values of the sinter particle size and the coke particle size and estimated from the combination of the determination result from the average particle size ratio and Example 6 will be described in Table 8. To do. As shown in Table 8, the change trend of the cohesive zone is determined based on the current value using the particle size status value. The level judgment reference value is set to an upper limit value of 30.0 and a lower limit value of 28.0.

First, the current value of the particle size status value is 27.0, and the level determination result is “out of the lower limit”. Therefore, the outer shape of the cohesive zone tends to move away from the furnace wall due to the deposition of ore near the furnace, that is, the decrease in the flow into the middle and near the center of the furnace, and the root of the cohesive zone is located near the Bosch part. Tends to move downwards. As the determination result of the change trend of the cohesive zone, "poor inflow of ore into the middle of the furnace or near the center" is selected from among the patterns of the change trend of the cohesive zone in advance.

Next, this determination result and the determination result of Example 6 are combined, and a match is determined from the preliminarily classified fused zone shapes by the overall determination by the weighting, and the operation content is determined according to the determination. select. Specifically, the determination is "Continuation of head heat and foot heat type" in Example 6 and "Failure of ore flowing into the vicinity of the center of the furnace" which is the current determination.
Based on the combination of the weighting characteristics of, a new comprehensive determination is made as “head heat foot heat type → head heat type”. It is possible to presume that the change content of the cohesive zone shape is approaching the target cohesive zone shape based on the operation contents set in advance from the "deviation" characteristic of the cohesive zone shape, and "quiet view" is selected. Next, the past operation contents are checked, and this comprehensive judgment is used as it is as the final judgment.
These judgment results are displayed as a comprehensive judgment to the operator, and the blast furnace is operated according to the contents of the operation.

EFFECTS OF THE INVENTION According to the present invention, the conventional cohesive zone detection method is fundamentally different from the analysis means, and the cohesive zone shape is classified based on the result of research and development as a blast furnace operation technique. Based on, it is possible to detect the overall shape of the cohesive zone in real time, and in addition, it is also possible to detect how the current cohesive zone shape will change in the future.
It reflects the results of the investigation of the autonomous action of the cohesive zone, is excellent in the speed and accuracy of the actual operation of the blast furnace, is persuasive to the actual operator, is convincing, and greatly helps prevent misjudgment. By this, while maintaining stable operation, it is possible to secure the flexibility of productivity and reduce the fuel ratio, which greatly contributes to the development of comprehensive blast furnace operation technology, and the present invention is extremely useful industrially. .

[Brief description of drawings]

FIG. 1 is a flow chart of the present invention, FIG. 2 is a schematic view of the technique relating to the determination of the cohesive zone shape and / or its change trend of the present invention, and FIG. 3 is a vertical sectional view of the inside of a blast furnace. FIG. 4 is a layout drawing of the measuring instruments in FIG. 4 and a name drawing of facilities and the like, and FIG. 4 is a view showing a relationship between each fusing zone shape formed in the blast furnace, the stave temperature, the ventilation resistance index, and ηCO.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Sanai 1 Nishinosu, Oita-shi, Oita Pref. Nippon Steel Co., Ltd. Oita Works (72) Inventor Yoshihiro Inoue 1 Nishinosu, Oita-shi, Oita Pref. Oita Steel Works, Ltd. (56) Reference JP-A-51-151209 (JP, A) JP-A-56-136906 (JP, A) JP-A-62-243702 (JP, A) JP-B-52- 724 (JP, B2)

Claims (14)

[Claims] 1. A shape of a cohesive zone formed in a blast furnace is determined based on a measurement value from a measuring instrument provided in the blast furnace, and the shape of the cohesive zone determined is determined as a target cohesive zone shape. In the method of determining operating conditions and operating the blast furnace based on the operating conditions, the stave temperature at a plurality of points in the blast furnace height direction and the circumferential direction is measured by the stave thermometer as the measuring device, and at least the shaft portion And a representative value of the Bosch portion is calculated, and the present cohesive zone shape is selected from the predetermined cohesive zone shape classification based on the representative value. 2. In addition to the shape of the cohesive zone selected by the stave temperature of claim 1, the pressure inside the blast furnace is measured by a pressure gauge as the measuring instrument, and the measured values are measured. Calculate the ventilation resistance index of the furnace upper part and the furnace lower part from this, select the current fusion zone shape from the predetermined fusion zone shape from this calculated ventilation resistance index, and combine both fusion zone shapes Method of operating a blast furnace, characterized by determining the shape of a cohesive zone. 3. In addition to the shape of the cohesive zone selected by the stave temperature of claim 1, gas components in blast furnaces are measured at a plurality of points in the blast furnace radial direction by a sonde as the measuring instrument, and the measured values are measured. At least three divisions are made in the radial direction, the carbon monoxide gas utilization rate is calculated from the representative value of each of the divided areas, and the present fusion zone shape is determined from the carbon monoxide gas utilization rate. A method for operating a blast furnace, characterized by selecting from categories and combining both cohesive zone shapes to determine a comprehensive cohesive zone shape. 4. In addition to the shape of the cohesive zone determined by the combination of the measured values of stave temperature and furnace pressure of claim 2, the gas component in the blast furnace is moved in the radial direction of the blast furnace by a sonde as the measuring device. Measure at multiple points, divide by at least 3 in the radial direction of the blast furnace from this measured value, calculate the carbon monoxide gas utilization rate from the representative value of each divided area, and from this carbon monoxide gas utilization rate, the current fusion zone A method for operating a blast furnace, which comprises selecting a shape from a predetermined cohesive zone shape classification and combining both cohesive zone shapes to determine a comprehensive cohesive zone shape. 5. The shape of the cohesive zone formed in the furnace of the blast furnace is determined based on a measurement value from a measuring instrument provided in the blast furnace, and the determined cohesive zone shape of the blast furnace is adjusted so as to become a target cohesive zone shape. In the method of determining operating conditions and operating the blast furnace based on the operating conditions, the stave temperature at a plurality of points in the blast furnace height direction and the circumferential direction is measured by the stave thermometer as the measuring device, and at least the shaft portion And the representative value of the Bosch part is calculated, and from the representative value and the time-series change trend of the representative value, the current cohesive zone shape is selected from the predetermined cohesive zone shape categories and A method for operating a blast furnace, characterized by determining trends. 6. In addition to the fusing zone shape selected according to the measured value of the stave temperature and the trend between the fusing zone shape sections according to claim 5, the pressure gauge as the measuring instrument is used to measure the upper, middle and tuyere of the blast furnace. The furnace pressure of the part is measured, and the ventilation resistance index of the furnace upper part and the furnace lower part is calculated from this measured value, and the present fusion zone shape is calculated in advance from this calculated ventilation resistance index and the time-series change trend of the ventilation resistance index. Select from the determined cohesive zone shape categories and determine the trends between the cohesive zone shape categories, and combine the two cohesive zone shapes and the variations between the cohesive zone shape categories and the overall cohesive zone shape and its A method for operating a blast furnace, characterized by determining trends. 7. In addition to the trend of the cohesive zone shape and the cohesive zone shape section selected based on the measured value of the stave temperature of claim 5, the gas component in the blast furnaces is controlled by a sonde as the measuring instrument. Direction is measured at multiple points, and the measured value is divided into at least 3 in the radial direction of the blast furnace, and the carbon monoxide gas utilization rate is calculated from the representative value of each divided area. The calculated carbon monoxide gas utilization rate and its time series From the change trend, the cohesive zone shape is selected from the predetermined cohesive zone shape sections and the trend between the cohesive zone shape sections is determined, and the cohesive zone shape and the variation between the cohesive zone shape sections are combined. A method for operating a blast furnace, which is characterized by determining a comprehensive cohesive zone shape and its trend together. 8. A blast furnace using a sonde as the measuring instrument, in addition to the trend of the cohesive zone shape and the zone of cohesive zone determined by the combination of the measured values of stave temperature and in-furnace pressure of claim 6. The gas components inside are measured at multiple points in the radial direction of the blast furnace,
From this measurement value, divide it into at least 3 parts in the radial direction of the blast furnace,
The carbon monoxide gas utilization rate is calculated from the representative value of each of the divided areas, and the present cohesive zone shape is selected from the predetermined cohesive zone shape categories based on the carbon monoxide gas utilization rate and its time series change trend. Together with the trend of fusion zone shape classification,
A method for operating a blast furnace, characterized in that a comprehensive cohesive zone shape and its trend are determined by combining both cohesive zone shapes and variations between the cohesive zone shapes. 9. In addition to the trend between the cohesive zone shape sections determined by the combination of the measured values of stave temperature and in-furnace pressure of claim 6, the sinter ore particle size and coke particle size charged in the furnace Obtain each average particle size from the measured values, determine the trend between the cohesive zone shape categories from the time series trend of this average particle size, and combine the variations between both cohesive zone shape categories to create a comprehensive fusion bond. A method for operating a blast furnace, which is characterized by determining trends between band shape divisions. 10. The particle size of the sintered ore charged in the furnace, in addition to the trend between the cohesive zone shape sections determined by the combination of the stave temperature, the furnace pressure and the carbon monoxide gas utilization rate according to claim 8. The average particle size is calculated from the measured values of the coke particle size and the coke particle size, the trend between the cohesive zone shape categories is determined from the time series trend of the average particle size, and the variation between both cohesive zone shape categories is combined and combined. A method for operating a blast furnace, characterized by determining the trend between the cohesive zone shape categories. 11. The operating condition corresponding to the final judgment and the predetermined judgment is displayed to an operator, and the blast furnace is operated in consideration of the display.
11. The method of operating a blast furnace according to claim 10. 12. The blast furnace operating method according to claim 1, wherein the blast furnace is operated according to a predetermined operating condition corresponding to the final determination. 13. The operation condition corresponding to the final judgment and the predetermined judgment is corrected based on the operation condition taken in the past and displayed to an operator, and the blast furnace is operated in consideration of the display. The method for operating a blast furnace according to any one of claims 1 to 10, characterized in that. 14. The final judgment and predetermined operating conditions corresponding to the judgment are corrected and displayed to an operator according to each mode based on planned downwind, precipitation, raw material abnormality, equipment failure, or the like. The blast furnace operating method according to any one of claims 1 to 10, wherein the blast furnace is operated in consideration of the indication.