Method and system for diagnosing and preventing low-furnace-temperature material slipping of blast furnace

Abstract

The invention discloses a diagnosis and prevention method and system for low-furnace-temperature material slipping of a blast furnace, and the method comprises the steps: collecting real-time operation parameters during the production operation period of the blast furnace, and processing the parameters; on the basis of the processed parameters, an on-line diagnosis standard of low-furnace-temperature material slipping of the blast furnace is built, and the number of times of low-temperature material slipping within the set time is obtained; on the basis of the processed parameters, constructing an online diagnosis model for the length-height ratio of the tuyere convolute region; on the basis of the processed parameters, a soft melting zone position online diagnosis model is constructed; and constructing a blast furnace low-furnace-temperature material slippage cause diagnosis model, analyzing the root cause of low-furnace-temperature material slippage of the blast furnace, and formulating a corresponding coping method. The method can deeply excavate the influence factors causing the abnormal furnace condition, can effectively improve the furnace condition management of the blast furnace, improves the stable and smooth operation of the blast furnace, and has the advantages of convenience in operation and remarkable effect.

Description

Technical Field

[0001] The present invention relates to the technical field of diagnosing and preventing abnormal furnace conditions in blast furnace ironmaking, and particularly relates to a method and system for diagnosing and preventing low furnace temperature and stock slipping in a blast furnace. Background Art

[0002] In the process of ironmaking production, the descent of burden materials and the rise of gas are a pair of major contradictions. The phenomenon that the burden materials in the blast furnace suddenly drop rapidly is called stock slipping. The main reasons for its occurrence are as follows: excessively high or low furnace temperature, unreasonable gas distribution, equipment failure or deterioration of raw material quality, abnormal operation of the hearth, etc., which cause a significant reduction in the gas supporting force, resulting in a rapid drop of the burden materials. At present, most measures are taken to restore the furnace condition after stock slipping, such as reducing the smelting intensity, optimizing the charging and blowing systems accordingly, improving the fluidity of slag and iron, and re-spraying and patching the furnace wall.

[0003] Low-temperature stock slipping is a special manifestation of blast furnace stock slipping, which usually occurs when the quality of raw fuels is stable and the equipment operates normally. Its significant characteristics are that the furnace temperature (silicon content in hot metal) remains continuously low, and the effect of increasing the coal injection rate to raise the furnace temperature is not obvious, thus leading to the occurrence of stock slipping. The Chinese invention patent with the patent number CN 202111409691.7 discloses a secondary response method for low furnace temperature and stock slipping in a blast furnace, including measures such as expanding the ore batch, reducing the charging speed, reducing the dead coke bed, stabilizing the heat input, improving the fluidity, adding light materials, adding coal amount into the blast furnace, reducing the wind and oxygen, etc. This invention provides a passive response method for blast furnace operators facing low-temperature stock slipping, but there is no quantitative real-time characterization for low-temperature stock slipping, nor an analysis of the root causes of frequent low-temperature stock slipping and a targeted solution.

[0004] Therefore, it is necessary to establish a set of real-time diagnosis rules for low-temperature stock slipping, analyze the reasons for low-temperature stock slipping, and give corresponding countermeasures. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for diagnosing and preventing low furnace temperature and stock slipping in a blast furnace, which can effectively diagnose and prevent the abnormal furnace condition of low furnace temperature and stock slipping in the blast furnace production process, and provide a guiding basis for actual production.

[0006] The present invention adopts the following technical solutions: The present invention provides a method for diagnosing and preventing low furnace temperature and stock slipping in a blast furnace, including:

[0007] S1. Collect the real-time operation parameters during the operation of the blast furnace production and process the parameters.

[0008] S2. Based on the processed parameters in step S1, construct an online diagnosis standard for low furnace temperature and stock slipping in the blast furnace to obtain the number of times of low-temperature stock slipping within a set time.

[0009] S3. Based on the parameters processed in step S1, construct an online diagnosis model for the height-to-length ratio of the tuyere raceway.

[0010] S4. Based on the parameters processed in step S1, construct an online diagnosis model for the position of the cohesive zone.

[0011] S5. Based on steps S2 - S4, construct a diagnostic model for the causes of low hearth temperature and stock slipping in the blast furnace, analyze the root causes leading to low hearth temperature and stock slipping in the blast furnace, and formulate corresponding countermeasures.

[0012] Further, in step S1, use the data acquisition software Wonderware to collect real-time operating parameters from on-site PLC devices. The parameters include the lifter signal, burden line depth, silicon content in hot metal, cooling stave temperature, tuyere area, wind speed, blast kinetic energy, coal injection rate, coal ratio, number of tuyeres for coal injection, hearth temperature, number of laps set at each angle of coke and ore, and cooling water volume at the furnace bottom.

[0013] If the parameter exceeds the upper limit of the set index value or is lower than the lower limit of the set index value, it is an abnormal value. Delete it and replace it with the average value of the adjacent data before and after, and delete the abnormal values during blast furnace shutdown and equipment failures.

[0014] Further, in step S2, obtaining the number of times of low-temperature stock slipping within the set time includes the following:

[0015] Since ordinary stock slipping does not necessarily occur with low temperature, and ordinary low temperature does not necessarily occur with stock slipping, people have a set of countermeasures for both low temperature and stock slipping. However, low-temperature stock slipping often confuses people, resulting in ineffective countermeasures and adjustment effects falling short of predictions.

[0016] When the silicon content in hot metal of two consecutive heats is lower than the lower limit of the set silicon content in hot metal, the coal ratio is higher than the upper limit of the set coal ratio, and the burden line depth during lifter operation within 2 hours is higher than the upper limit of the set burden line depth, it indicates one occurrence of low-temperature stock slipping. Count the number of times N of low-temperature stock slipping within a day.

[0017] Further, in step S3, constructing the online diagnosis model for the height-to-length ratio of the tuyere raceway includes the following:

[0018] The calculation formulas for the height and length of the tuyere raceway are:

[0019] DR = 0.88 + 0.000092E - 0.00031*P c / n

[0020]

[0021] where DR represents the length of the tuyere raceway, HR represents the height of the tuyere raceway, v otv represents the wind speed, g represents the acceleration due to gravity, and d pc represents the average particle size of coke, E represents the blast kinetic energy, and P c represents the coal injection rate, and n represents the number of tuyeres.

[0022] The calculation formula for the ratio of the length to the height T of the raceway is:

[0023] T = DR / HR;

[0024] When the position of the cohesive zone is at the lower part, the height direction of the raceway is squeezed, and the gas flow develops towards the center; when the position of the cohesive zone is at the upper part, the length direction of the raceway shrinks, and the gas flow develops in the height direction; thus, the ratio of the length to the height T of the raceway changes.

[0025] Furthermore, in step S4, constructing an on-line diagnosis model for the position of the cohesive zone includes the following content:

[0026] Generally, there are more than a dozen elevations from the top to the bottom of the furnace body, and there are dozens of thermocouples around the furnace body at each elevation. Calculate the standard deviation of the temperatures of all the thermocouples at each elevation of the cooling stave in the past hour in the background using an SQL database, and obtain the corresponding average value TP 1 、TP 2 、.....、TP i 、.....、TP M ,and perform normalization processing on them, denoted as X 1 、X 2 、......、X i 、......、X M 。

[0027] Among them, TP i represents the average value of the standard deviation of the temperatures within one hour of the i-th layer of the cooling stave, TP M represents the average value of the standard deviation of the temperatures within one hour of the M-th layer of the cooling stave, X i represents the value after normalization of TP i ,X M represents the value after normalization of TP M ,i = 1, 2... M, M represents the total number of layers of the cooling stave, X i = TP i / TP a ,TP a represents TP 1 to TP M 's average value.

[0028] Define the elevation corresponding to the maximum value among X 1 、X 2 、......、X M as the position H of the cohesive zone.

[0029] Further, in step S5, formulating countermeasures includes the following:

[0030] Based on the statistically counted number N of low-temperature material slippage occurrences within a day, set a threshold value N 0 , compare the real-time operating parameters during the period of N > N 0 and the period of N = 0; when N = 0, obtain the position H of the cohesive zone during the period without low-temperature material slippage 0 , when N = 0, obtain the aspect ratio T of the raceway length and height during the period without low-temperature material slippage 0 .

[0031] When the hearth temperature is within the normal range, and H < H 0 , T > T 0 , it indicates that the reason for low-temperature material slippage is that the position of the root of the cohesive zone is too low. Then adjust the operating regime to develop the edge gas flow, increase the coke amount at the edge part or reduce the ore amount at the edge part by 5% - 10%, and expand the tuyere area by 5% - 15%.

[0032] When the hearth temperature is lower than the normal range, and H < H 0 , T > T 0 do not satisfy simultaneously, it indicates that the reason for low-temperature material slippage is that the hearth is not active. Then increase the coke amount per batch by 5% - 10%, increase the blast kinetic energy by 2% - 5%, and reduce the cooling water amount in the hearth by 5% - 10%.

[0033] Further, the present invention also proposes a diagnosis and prevention system for low hearth temperature material slippage in a blast furnace, including:

[0034] A parameter processing module, configured to collect real-time operating parameters during the production operation of the blast furnace and process the parameters.

[0035] A diagnosis standard construction module, configured to construct an online diagnosis standard for low hearth temperature material slippage in the blast furnace based on the processed parameters in the parameter processing module, and obtain the number of low-temperature material slippage occurrences within a set time.

[0036] A model construction module, configured to construct an online diagnosis model for the aspect ratio of the raceway length and height and construct an online diagnosis model for the position of the cohesive zone based on the processed parameters in the parameter processing module.

[0037] A countermeasure formulation module, configured to construct a cause diagnosis model for low hearth temperature material slippage in the blast furnace based on the diagnosis standard construction module and the model construction module, analyze the root cause of low hearth temperature material slippage in the blast furnace, and formulate corresponding countermeasures.

[0038] Furthermore, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the diagnosis and prevention method for low hearth temperature and slippery burden in blast furnace are implemented.

[0039] Furthermore, the present invention also provides a computer-readable storage medium storing a computer program, and when the computer program is run by a processor, the diagnosis and prevention method for low hearth temperature and slippery burden in blast furnace is executed.

[0040] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

[0041] The present invention summarizes the abnormal events of low hearth temperature and slippery burden in blast furnace, establishes relevant judgment algorithms through intelligent technology, deeply excavates the influencing factors causing such abnormal furnace conditions, constructs a cause diagnosis model, and forms a prevention method based on the model. Through the application of the present invention, the blast furnace condition management can be effectively improved, and the stable and smooth operation of the blast furnace can be enhanced. Description of the Drawings

[0042] Figure 1 is the overall implementation flowchart of the present invention. Detailed Embodiments

[0043] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0044] To achieve the above object, the present invention provides a diagnosis and prevention method for low hearth temperature and slippery burden in blast furnace. Taking a 2680m³ blast furnace started in 2023 as an example, 3 since the start-up of this blast furnace, the phenomenon of low hearth temperature and slippery burden has frequently occurred, bringing a great negative impact on the stable and smooth operation of the blast furnace. By tracking and studying the cases of low hearth temperature and slippery burden in this blast furnace, a technical theory for preventing and dealing with low hearth temperature and slippery burden is formed. As Figure 1 shown, the specific steps are as follows:

[0045] S1. Collect the real-time operation parameters of this blast furnace during the production operation period in 2023 from SQL sever and Oracle databases, and process these parameters. The specific content is:

[0046] Use the data acquisition software Wonderware to collect real-time operation parameters from on-site PLC devices. These parameters include lifting signal, burden line depth, silicon content of hot metal, cooling stave temperature, tuyere area, wind speed, blast kinetic energy, coal injection rate, coal ratio, number of coal injection tuyeres, hearth temperature, number of turns set for coke and ore at each angle, and cooling water volume at the furnace bottom.

[0047] Among them, the sounding rod data selects the "east sounding rod lifting" data according to the actual situation, and the remaining data is preprocessed according to the abnormal production and air volume (selecting data with a production ≥ 6500 t / d and an air volume ≥ 4500 Nm 3 / min).

[0048] If the parameter exceeds the upper limit of the set index value or is lower than the lower limit of the set index value, it is an abnormal value, which is deleted and replaced with the average value of the adjacent front and rear data, and the abnormal values of blast furnace shutdown and equipment failure are deleted.

[0049] S2. Based on the parameters processed in step S1, construct an online diagnosis standard for low hearth temperature and slippage in the blast furnace, and obtain the number of times of low temperature slippage within the set time. The specific content is as follows:

[0050] Since ordinary slippage does not necessarily accompany low temperature, and ordinary low temperature does not necessarily accompany slippage, there is a set of countermeasures for both low temperature and slippage. And low temperature slippage often confuses people, resulting in ineffective countermeasures and the adjustment effect being less than predicted.

[0051] When the silicon content of molten iron in two consecutive furnaces is lower than the lower limit of the set silicon content of molten iron (usually 0.3%), the coal ratio is higher than the upper limit of the set coal ratio, and the burden line depth at the time of lifting the rod within 2 hours is higher than the upper limit of the set burden line depth (usually 2.0 m), it indicates that there is one case of low temperature slippage, and the number of times of low temperature slippage N within a day is statistically counted.

[0052] S3. Based on the parameters processed in step S1, construct an online diagnosis model for the ratio of the height to the length of the tuyere raceway. The specific content is as follows:

[0053] The calculation formulas for the height and length of the tuyere raceway are as follows:

[0054] DR = 0.88 + 0.000092E - 0.00031*P c / n

[0055]

[0056] Among them, DR represents the length of the tuyere raceway, HR represents the height of the tuyere raceway, v ot represents the wind speed, g represents the acceleration of gravity, d pc represents the average particle size of coke, E represents the blast kinetic energy, P c represents the coal injection rate, and n represents the number of tuyeres.

[0057] The calculation formula for the ratio of the height to the length of the raceway T is:

[0058] T = DR / HR;

[0059] When the position of the cohesive zone is at the lower part, the height direction of the raceway is squeezed, and the gas flow develops towards the center; when the position of the cohesive zone is at the upper part, the length direction of the raceway shrinks, and the gas flow develops towards the height direction; thus, the aspect ratio T of the raceway changes.

[0060] S4. Based on the parameters processed in step S1, construct an on-line diagnosis model for the position of the cohesive zone. The specific content is as follows:

[0061] Generally, there are more than a dozen elevation levels from top to bottom of the furnace body, and there are dozens of thermocouples around the furnace body at each elevation level. Use an SQL database in the background to calculate the standard deviation of the temperatures of all thermocouples at each elevation level of the cooling stave in the past hour in real time, and obtain the corresponding average value TP 1 、TP 2 、.....、TP i 、.....、TP M , and perform normalization processing on it, denoted as X 1 、X 2 、......、X i 、......、X M .

[0062] Among them, TP i represents the average value of the standard deviation of the temperatures within one hour of the i-th layer of the cooling stave, TP M represents the average value of the standard deviation of the temperatures within one hour of the M-th layer of the cooling stave, X i represents the value after normalization of TP i , X M represents the value after normalization of TP M , i = 1, 2... M, M represents the total number of layers of the cooling stave, X i = TP i / TP a , TP a represents the average value of TP 1 to TP M .

[0063] Define the elevation corresponding to the maximum value among X 1 、X 2 、......、X M as the position H of the cohesive zone.

[0064] S5. Based on steps S2 - S4, construct a diagnosis model for the causes of low hearth temperature and slippage in the blast furnace, analyze the root causes leading to low hearth temperature and slippage in the blast furnace, and formulate corresponding countermeasures. The specific content is as follows:

[0065] Based on the number N of low-temperature slippages occurring within a day statistically, set a threshold value N 0 , and compare N > N 0Real-time operating parameters during the period when N = 0; when N = 0, the position H of the cohesive zone without the low-temperature burden charging period is obtained. 0 When N = 0, the aspect ratio T of the raceway length and height without the low-temperature burden charging period is obtained. 0 .

[0066] When the temperature of the hearth is within the normal range and H < H 0 and T > T 0 , it indicates that the reason for the low-temperature burden charging is that the position of the root of the cohesive zone is too low. Then, adjust the operating regime to develop the peripheral gas flow, increase the amount of coke in the peripheral part or reduce the amount of ore in the peripheral part by 5% - 10%, and expand the tuyere area by 5% - 15%.

[0067] When the temperature of the hearth is lower than the normal range and H < H 0 and T > T 0 do not satisfy simultaneously, it indicates that the reason for the low-temperature burden charging is that the hearth is inactive. Then, increase the amount of coke per batch by 5% - 10%, increase the blast kinetic energy by 2% - 5%, and reduce the cooling water volume in the hearth by 5% - 10%.

[0068] After applying the method proposed by the present invention to this blast furnace, the judgment accuracy rate of the low-hearth-temperature burden charging algorithm reaches more than 95%, and the average monthly number of low-temperature burden charging times is reduced by more than 70% before and after the application.

[0069] The embodiment of the present invention also proposes a diagnosis and response system for low-hearth-temperature burden charging in a blast furnace, including a parameter processing module, a diagnosis standard construction module, a model construction module, a response method formulation module, and a computer program that can run on a processor. It should be noted that each module in the above system corresponds to the specific steps of the method provided by the embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in this embodiment, reference can be made to the method provided by the embodiment of the present invention.

[0070] The embodiment of the present invention also proposes an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. It should be noted that when the processor executes the computer program, it corresponds to the specific steps of the method provided by the embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in this embodiment, reference can be made to the method provided by the embodiment of the present invention.

[0071] The embodiment of the present invention also proposes a computer-readable storage medium, and the computer-readable storage medium stores a computer program. It should be noted that when the computer program is run by a processor, it corresponds to the specific steps of the method provided by the embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in this embodiment, reference can be made to the method provided by the embodiment of the present invention.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for diagnosing and preventing blast furnace low-temperature slip, characterized in that: include: S1. Collecting real-time operating parameters during the blast furnace production operation and processing the parameters; S2. Based on the parameters processed in step S1, an online diagnostic standard for blast furnace low-temperature slip is constructed to obtain the number of low-temperature slips within a set time; S3, based on the parameters processed in step S1, construct an online diagnostic model for the length-to-height ratio of the tuyere raceway; S4, based on the parameters processed in step S1, construct an online diagnosis model for the position of the soft melting zone; S5. Based on steps S2-S4, a diagnosis model for the cause of low-temperature slip in the blast furnace is constructed to analyze the root cause of low-temperature slip in the blast furnace and formulate corresponding countermeasures.

2. The method for diagnosing and preventing blast furnace and low furnace temperature slip according to claim 1, characterized in that: In step S1, the real-time operating parameters include the ruler signal, the material line depth, the silicon content of the molten iron, the cooling wall temperature, the tuyere area, the wind speed, the kinetic energy of the blast, the coal injection amount, the coal ratio, the number of coal injection tuyere, the furnace core temperature, the number of circles set at each angle of coke and ore, and the amount of cooling water at the furnace bottom; If the parameter exceeds the set upper limit of the index value or is lower than the set lower limit of the index value, it is an abnormal value and will be deleted and replaced by the average value of the adjacent data before and after. Abnormal values ​​of wind failure and equipment failure will also be deleted.

3. The method for diagnosing and preventing blast furnace and low furnace temperature slip according to claim 1, characterized in that: In step S2, obtaining the number of low-temperature slippages within a set time includes the following: When the silicon content of molten iron in two consecutive furnaces is lower than the set lower limit of molten iron silicon content, the coal ratio is higher than the set upper limit of coal ratio, and the material line depth when the gauge is lifted is higher than the set upper limit of material line depth within 2 hours, it indicates that a low-temperature slip has occurred. The number of low-temperature slips N that occur in one day is counted.

4. The method for diagnosing and preventing blast furnace and low furnace temperature slippage according to claim 1, characterized in that: In step S3, constructing an online diagnostic model for the length-to-height ratio of the tuyere raceway includes the following contents: The calculation formula for the height and length of the tuyere raceway is: DR=0.88+0.000092E-0.00031*P c / n Among them, DR represents the length of the wind outlet turning zone, HR represents the height of the wind outlet turning zone, and v ot represents wind speed, g represents gravitational acceleration, d pc represents the average particle size of coke, E represents the kinetic energy of blast, P c represents the amount of coal injection, and n represents the number of tuyere; The calculation formula of the length-to-height ratio T of the raceway is: T = DR / HR; When the soft melting zone is located at the bottom, the height direction of the cyclotron is squeezed and the airflow develops toward the center; when the soft melting zone is located at the top, the length direction of the cyclotron shrinks and the airflow develops toward the height direction; thereby changing the length-to-height ratio T of the cyclotron.

5. The method for diagnosing and preventing blast furnace and low furnace temperature slip according to claim 1, characterized in that: In step S4, constructing an online diagnosis model for the soft melting zone position includes the following contents: Calculate the temperature standard deviation of all thermocouples at each level of the cooling wall in the past hour, and obtain the corresponding average values ​​TP1, TP2, ..., TP i ,.....,TP M , and normalize them, expressed as X1, X2, ..., X i ,......,X M ; Among them, TP i represents the average value of the standard deviation of the temperature of the i-th cooling wall within one hour, TP M represents the average value of the temperature standard deviation of the Mth layer cooling wall within one hour, X i Indicates TP i The normalized value, X M Indicates TP M Normalized value, i = 1, 2...M, M represents the total number of cooling wall layers, X i =TP i / TP a ,TP a Indicates TP1 to TP M The average value of Define X1, X2, ..., X M The elevation corresponding to the maximum value is the location H of the soft melting zone.

6. The method for diagnosing and preventing blast furnace and low furnace temperature slip according to claim 1, characterized in that: In step S5, the response method is formulated including the following contents: Based on the statistical number of low-temperature slippages N in one day, the limit value N0 is set, and the real-time operating parameters of the period N>N0 and the period N=0 are compared; when N=0, the soft melting zone position H0 in the period without low-temperature slippage is obtained, and when N=0, the height-to-length ratio T0 of the raceway in the period without low-temperature slippage is obtained; When the furnace core temperature is within the normal range and H<H0、T> At T0, it indicates that the reason for the low-temperature sliding is that the root of the soft melting zone is too low, so the operating system is adjusted to develop the edge airflow, increase the amount of coke at the edge or reduce the amount of ore at the edge by 5%-10%, and expand the tuyere area by 5%-15%; where T represents the length-to-height ratio of the cyclotron zone, and H represents the location of the soft melting zone; When the furnace core temperature is lower than the normal range and H<H0、T> When T0 is not satisfied at the same time, it indicates that the reason for low-temperature slippage is that the furnace is inactive. In this case, the amount of coke in each batch should be increased by 5%-10%, the blast kinetic energy should be increased by 2%-5%, and the amount of cooling water in the furnace should be reduced by 5%-10%.

7. A system for diagnosing and preventing blast furnace and low furnace temperature slipping material according to claim 1, characterized in that: include: The parameter processing module is used to collect the real-time operating parameters during the blast furnace production operation and process the parameters; The diagnostic standard construction module is used to construct the online diagnostic standard of blast furnace low-temperature slip based on the parameters processed in the parameter processing module, and obtain the number of low-temperature slips within a set time; A model building module, used to build an online diagnosis model of the length-to-height ratio of the tuyere whirlpool zone and an online diagnosis model of the soft melting zone position based on the parameters processed in the parameter processing module; The response method formulation module is used to construct a diagnosis model for the cause of low-temperature slip in the blast furnace based on the diagnosis standard construction module and the model construction module, analyze the root cause of low-temperature slip in the blast furnace, and formulate corresponding response methods.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for diagnosing and preventing blast furnace and low furnace temperature slippage as described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for diagnosing and preventing blast furnace and low furnace temperature slip material according to any one of claims 1 to 6 is executed.

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