WO2017163902A1 - Procédé de prétraitement de fonte brute en fusion et dispositif de commande de prétraitement de fonte brute en fusion - Google Patents

Procédé de prétraitement de fonte brute en fusion et dispositif de commande de prétraitement de fonte brute en fusion Download PDF

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Publication number
WO2017163902A1
WO2017163902A1 PCT/JP2017/009453 JP2017009453W WO2017163902A1 WO 2017163902 A1 WO2017163902 A1 WO 2017163902A1 JP 2017009453 W JP2017009453 W JP 2017009453W WO 2017163902 A1 WO2017163902 A1 WO 2017163902A1
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Prior art keywords
hot metal
dephosphorization
carbon concentration
exhaust gas
amount
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PCT/JP2017/009453
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English (en)
Japanese (ja)
Inventor
健 岩村
兼安　孝幸
太一 中江
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Priority to CN201780003670.0A priority Critical patent/CN108138246B/zh
Priority to JP2018507205A priority patent/JP6547901B2/ja
Priority to KR1020187010776A priority patent/KR102133215B1/ko
Publication of WO2017163902A1 publication Critical patent/WO2017163902A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter

Definitions

  • the present invention relates to a hot metal pretreatment method and a hot metal pretreatment control device for estimating a carbon concentration in hot metal after dephosphorization in hot metal pretreatment using a converter.
  • the converter blowing in the steelmaking process is based on static control and sublance measurement in order to bring the molten steel component concentration (for example, carbon concentration, etc.) and the molten steel temperature to the target values at the time of blowing stop (at the end of decarburization treatment).
  • Blowing control combined with dynamic control is performed.
  • static control before starting smelting, based on hot metal data such as component concentration in hot metal, using a mathematical model based on the material balance and heat balance, the molten steel component concentration and molten steel temperature at the time of blowing The amount of blown oxygen and the amount of various auxiliary materials required to bring the target to the target value are determined, and blowing is performed according to this.
  • the molten steel component concentration and molten steel temperature are actually measured using a sublance, and based on these measured values, using a mathematical model based on the material balance and heat balance, etc.
  • the blown oxygen amount and the input amounts of various auxiliary materials determined by static control are updated, and blowing is performed using these updated values.
  • MURC MUlti Refining Converter
  • the static control is not performed based on the actual value of the carbon concentration in the hot metal at the start of the dephosphorization process, not at the start of the decarburization process. It is required to determine the amount of oxygen blown in and the amount of various auxiliary materials charged.
  • the carbon concentration in the hot metal may be greatly reduced or not significantly reduced from the initial assumption.
  • the carbon concentration in the molten steel after the decarburization treatment may greatly deviate from the target carbon concentration. Therefore, in order to reliably obtain molten steel having a target carbon concentration, it is necessary to perform static control based on the carbon concentration in the hot metal after the dephosphorization treatment, not before the dephosphorization treatment. Since it is difficult to directly measure the carbon concentration in the hot metal after the dephosphorization treatment, a technique for theoretically estimating the carbon concentration in the hot metal after the dephosphorization treatment is required.
  • Patent Document 1 a parameter regarding decarbonation efficiency is calculated using exhaust gas data discharged from a converter in a decarburization process, and the decarburization process is performed using the parameter in the molten steel.
  • a technique for estimating the carbon concentration is disclosed. In this technique, in the decarburization treatment, the blown oxygen and the carbon in the molten steel are in a ratio of approximately 1: 1 (here, the ratio of 1: 1 corresponds to 1: 1 in the molar ratio).
  • a model is used that combines the behavior in which the decarbonation efficiency is constant at the stage of the decarburization peak period that reacts with the behavior in which the decarbonation efficiency decreases when the carbon concentration in the molten steel falls below the critical value. Yes. Thereby, since the estimation of the carbon concentration reflecting the transition of the decarburization process is possible, the estimation accuracy of the carbon concentration in the molten steel and the molten steel temperature is improved.
  • the carbon concentration in the molten steel estimated by the technique described in Patent Document 1 is merely an estimate of the carbon concentration in the hot metal in the decarburization process.
  • the oxygen flow rate blown into the converter differs from the decarburization process. Specifically, in the decarburization process, oxygen is blown from the top lance at high speed for decarburization of the molten steel, but in the dephosphorization process, iron oxide slag is generated efficiently to promote dephosphorization. To do so, oxygen is blown at a low speed. When the flow rate of oxygen blown into the converter is different, the mechanism of the oxidation reaction occurring in the converter is also different.
  • Patent Document 1 Even if the technique related to the estimation of the carbon concentration disclosed in Patent Document 1 is applied as it is to the estimation of the carbon concentration in the hot metal in the dephosphorization process, the carbon concentration in the hot metal after the dephosphorization process is highly accurate. It is difficult to estimate.
  • the present invention has been made in view of the above problems, and an object of the present invention is a novel and improved technique capable of accurately estimating the carbon concentration in hot metal after dephosphorization. Another object is to provide a hot metal pretreatment method and a hot metal pretreatment control device.
  • hot metal data relating to hot metal before dephosphorization treatment and exhaust gas discharged from the converter during dephosphorization treatment are provided.
  • a data acquisition step for acquiring exhaust gas data including components and exhaust gas flow rate, and a correction for calculating the decarburization amount at the time of dephosphorization processing calculated based on the exhaust gas data based on the operating factors at the time of the dephosphorization processing is provided.
  • a hot metal pretreatment method that includes a carbon concentration estimation step that corrects using a value and estimates a carbon concentration after dephosphorization based on the corrected decarburization amount and the hot metal data.
  • the correction value may be calculated by a regression equation having the operation factor as an explanatory variable.
  • the operation factor during the dephosphorization treatment may include an operation factor indicating the hatching status of the slag during the dephosphorization treatment.
  • the operation factor indicating the hatching status of the slag may include an operation factor related to acoustic information in the converter.
  • the target carbon concentration after the dephosphorization process and the amount of oxygen blown into the converter in the decarburization process performed after the dephosphorization process are further acquired.
  • the method may further include an oxygen amount correction step of correcting the blown oxygen amount based on a comparison result of the estimated carbon concentration after the dephosphorization treatment and the target carbon concentration after the dephosphorization treatment.
  • hot metal pretreatment control apparatus for controlling hot metal pretreatment using a converter, hot metal data relating to hot metal before dephosphorization treatment, A data acquisition unit that acquires exhaust gas data including exhaust gas components and exhaust gas flow rate discharged from the converter during the phosphorus treatment, and a decarburization amount calculated based on the exhaust gas data for the dephosphorization treatment.
  • a carbon concentration estimator that corrects using a correction value calculated based on the operating factor of the time and estimates the carbon concentration after dephosphorization based on the corrected decarburization amount and the molten iron data
  • a hot metal pretreatment control device is provided.
  • the hot metal preliminary treatment method uses a corrected decarburization amount obtained by correcting the decarburization amount obtained using the exhaust gas data with a correction value expressed by a regression equation with the operating factors during dephosphorization as explanatory variables. Estimate the carbon concentration in the hot metal after phosphorus treatment. Thereby, the carbon concentration in the hot metal after the dephosphorization process can be estimated with high accuracy without performing the sublance measurement after the dephosphorization process. Therefore, it becomes possible to more reliably obtain molten steel having a target carbon concentration after decarburization treatment.
  • FIG. 3 is a diagram illustrating an estimation error of a carbon concentration C deP in Example 1. It is a figure which shows the estimation error of the carbon concentration CdeP in Example 2.
  • FIG. 3 is a diagram illustrating an estimation error of a carbon concentration C deP in Example 1. It is a figure which shows the estimation error of the carbon concentration CdeP in Example 2.
  • pig iron or steel may be present in the converter at the time of decarburization depending on the carbon concentration, but in the following explanation, in order to avoid complicated explanation, For convenience, the molten steel will be referred to as molten steel.
  • the word hot metal is used for the dephosphorization process.
  • “after dephosphorization” is used to mean “when dephosphorization is completed (when dephosphorization is completed)” unless otherwise specified. That is, “after the dephosphorization process” does not include the time point after the start of the decarburization process.
  • the hot metal pretreatment method according to an embodiment of the present invention assumes that the carbon concentration in the hot metal after the dephosphorization process by MURC is estimated
  • the present invention is not limited to such an example.
  • the hot metal pretreatment method according to an embodiment of the present invention is a carbon in hot metal after dephosphorization treatment using another converter blowing method such as SRP (Simple Refining Process). It is also possible to estimate the concentration. That is, the hot metal pretreatment method according to one embodiment of the present invention estimates the carbon concentration in the hot metal after dephosphorization regardless of the converter blowing method used for hot metal pretreatment (particularly, dephosphorization). It is possible.
  • FIG. 1 is a diagram showing a configuration example of a hot metal pretreatment system 1 according to an embodiment of the present invention.
  • a hot metal preliminary treatment system 1 according to the present embodiment includes a converter blowing equipment 10, a hot metal preliminary treatment control device 20, and a measurement control device 30.
  • the converter blowing facility 10 includes a converter 11, a flue 12, an upper blowing lance 13, an exhaust gas component analyzer 101, and an exhaust gas flow meter 102.
  • the converter blowing facility 10 may further include a sound meter 111 and a sound collecting microphone 112.
  • the converter blowing facility 10 starts and stops the supply of oxygen to the hot metal by the top blowing lance 13, inputs the cold material, and converts the converter 11 based on the control signal output from the measurement control device 30. Performs processing related to hot metal and slag drainage.
  • the converter blowing equipment 10 is a sub lance for measuring the hot metal component density
  • a general converter such as a cold material charging device having a drive system for charging a cold material to 11 and an auxiliary material charging device having a drive system for charging an auxiliary material to the converter 11
  • Various devices used for blowing can be provided.
  • An upper blowing lance 13 used for blowing is inserted from the furnace port of the converter 11, and oxygen 14 sent from the acid feeding device is supplied to the molten iron in the furnace through the upper blowing lance 13.
  • an inert gas such as nitrogen gas or argon gas can be introduced from the bottom of the converter 11 as the bottom blowing gas 15 for stirring the hot metal.
  • hot metal discharged from the blast furnace a small amount of iron scrap, a cold material for adjusting the hot metal temperature, and auxiliary raw materials for slag formation such as quick lime are charged / input.
  • the auxiliary material is powder, it may be supplied into the converter 11 together with the oxygen 14 through the top blowing lance 13.
  • the carbon in the hot metal undergoes an oxidation reaction with oxygen supplied from the top blowing lance 13 (decarburization reaction). Thereby, CO or CO 2 exhaust gas is generated. These exhaust gases are discharged from the converter 11 to the flue 12.
  • the blown oxygen reacts with carbon, phosphorus, silicon, or the like in the hot metal to produce an oxide.
  • the generated oxide is discharged as exhaust gas or stabilized as slag.
  • Carbon is removed by an oxidation reaction in blowing, and phosphorus and the like are taken into and removed from the slag, thereby producing a steel with low carbon and less impurities.
  • a sub lance (not shown) can be inserted into the furnace from the furnace port of the converter 11.
  • the component concentration in the molten steel including the carbon concentration, the molten steel temperature, and the like are measured.
  • This measurement of the component concentration and / or molten steel temperature by the sublance is called sublance measurement.
  • the result of the sublance measurement is transmitted to the hot metal preliminary processing control device 20 via the measurement control device 30.
  • unmelted scrap may be present in the converter 11, and thus the sublance measurement is not performed, but the sublance measurement can be performed at a predetermined timing during the decarburization process.
  • the exhaust gas generated by blowing flows into a flue 12 provided outside the converter 11.
  • the flue 12 is provided with an exhaust gas component analyzer 101 and an exhaust gas flow meter 102.
  • the exhaust gas component analyzer 101 analyzes components contained in the exhaust gas.
  • the exhaust gas component analyzer 101 analyzes, for example, the concentrations of CO and CO 2 contained in the exhaust gas.
  • the exhaust gas flow meter 102 measures the flow rate of the exhaust gas.
  • the exhaust gas component analyzer 101 and the exhaust gas flow meter 102 sequentially analyze and measure exhaust gas at a predetermined sampling period (for example, 5 to 10 (sec) period).
  • exhaust gas data The data related to the exhaust gas component analyzed by the exhaust gas component analyzer 101 and the data related to the exhaust gas flow rate measured by the exhaust gas flow meter 102 (hereinafter, these data are referred to as “exhaust gas data”) Is output to the hot metal preliminary processing control device 20 as time series data.
  • the exhaust gas data may be sequentially output to the hot metal preliminary treatment control device 20, or may be output collectively to the hot metal preliminary treatment control device 20 when the dephosphorization processing is completed.
  • the converter blowing facility 10 may include a sound meter 111 and a sound collecting microphone 112.
  • the sound collection microphone 112 acquires a sound generated from the converter 11 and outputs a signal related to the sound to the sound meter 111.
  • the sound meter 111 performs signal processing on the acquired signal and generates a processing result as acoustic information.
  • the acoustic information generated here is output to the hot metal preliminary processing control device 20 via the measurement control device 30.
  • This acoustic information is information reflecting the hatching state of the slag in the converter 11 during the dephosphorization process, and can be used as a parameter of an operation factor during the dephosphorization process. The operating factors during the dephosphorization process will be described later in detail.
  • the converter blowing facility 10 is an apparatus for obtaining operating factor parameters indicating the hatching state of the slag in the converter 11 during the dephosphorization process. May be provided. For example, by irradiating microwaves into the converter 11 and measuring the slag level of the converter 11, the hatching state of the slag can be grasped. When acquiring the said slag level as a parameter of an operation factor, in the converter blowing equipment 10, the microwave irradiation apparatus for irradiating a microwave in the converter 11, for example, the microwave reflected on the molten metal surface is received. And an slag level measuring device for analyzing the slag level based on the microwave received by the antenna.
  • the hot metal pretreatment control device 20 includes a data acquisition unit 201, a carbon concentration estimation unit 202, a correction amount calculation unit 203, a hot metal pretreatment database 21, and an input / output unit 22.
  • the hot metal preliminary processing control device 20 includes hardware configurations such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage, a communication device, and the like. Functions of the unit 201, the carbon concentration estimation unit 202, the correction amount calculation unit 203, and the hot metal preliminary processing database 21 are realized.
  • the input / output unit 22 is realized by an input device such as a keyboard, a mouse, or a touch panel, an output device such as a display or a printer, and a communication device.
  • the hot metal pretreatment control device 20 has a general function required when performing control related to the hot metal pretreatment in addition to the functions shown in the drawing.
  • the hot metal pretreatment control device 20 has a function of controlling the entire process related to hot metal pretreatment such as blowing oxygen into the converter 11 and charging a cooling material and auxiliary materials.
  • the hot metal preliminary treatment control device 20 uses a predetermined mathematical model or the like, which is performed in general static control, and uses a predetermined mathematical model or the like, and inputs the amount of oxygen blown into the converter 11 and the cooling material. It has a function of determining an amount (hereinafter referred to as a cold material amount), an input amount of auxiliary materials, and the like.
  • the hot metal preliminary treatment control device 20 has a function of controlling the measurement object, the measurement timing, and the like of the sublance measurement performed in general dynamic control.
  • the hot metal pretreatment control device 20 estimates the carbon concentration in the hot metal after the dephosphorization treatment using various data stored in the hot metal pretreatment database 21 and the exhaust gas data as input values. Then, the hot metal preliminary treatment control device 20 corrects the indicated values of the blown oxygen amount and the cold material amount determined by the static control before the dephosphorization treatment based on the estimated carbon concentration in the hot metal. The hot metal pretreatment control device 20 further outputs the estimated carbon concentration in the hot metal, and the indicated values of the corrected blown oxygen amount and cold material amount to the input / output unit 22. Moreover, each instruction value output to the input / output unit 22 is output to the measurement control device 30 that controls the operation of the converter blowing facility 10. The measurement control device 30 performs control relating to the feeding of the acid into the converter 11 and the introduction of the cold material according to each indicated value acquired from the hot metal pretreatment control device 20.
  • the hot metal pretreatment database 21 is a database that stores various data used in the hot metal pretreatment control device 20, and is realized by a storage device such as a storage. As shown in FIG. 1, for example, the hot metal preliminary processing database 21 stores hot metal data 211, parameters 212, target data 213, and the like. These data may be added, updated, changed, or deleted via an input device or a communication device (not shown). Various data stored in the hot metal preliminary processing database 21 are called by the data acquisition unit 201.
  • the hot metal preliminary treatment database 21 stores the estimation result by the carbon concentration estimation unit 202 (for example, the carbon concentration in the hot metal after the dephosphorization process) or the correction result by the correction amount calculation unit 203 (for example, correction of the amount of blown oxygen) The later indicated value) may be stored.
  • the storage device having the hot metal preliminary processing database 21 according to the present embodiment is configured integrally with the hot metal preliminary processing control device 20 as shown in FIG. 1, but in other embodiments, the hot metal preliminary processing database 21 is configured.
  • the storage device having the processing database 21 may be separated from the hot metal preliminary processing control device 20.
  • the hot metal data 211 is various data relating to the hot metal in the converter 11.
  • the hot metal data 211 includes information about the hot metal (initial hot metal weight for each charge, concentration of hot metal components (carbon, phosphorus, silicon, iron, manganese, etc.), hot metal temperature, hot metal ratio, etc.).
  • the hot metal data 211 includes various other information generally required in hot metal preliminary treatment and decarburization processing (for example, information on the addition of auxiliary raw materials and cold materials (information on auxiliary raw materials and cold material amounts). ), Information on the sublance measurement (information on the measurement target, measurement timing, etc.), information on the insufflated oxygen amount, etc.).
  • the parameter 212 is various parameters used by the carbon concentration estimation unit 202 and the correction amount calculation unit 203.
  • the parameter 212 includes a parameter in a regression equation having an operation factor as an explanatory variable, and a parameter for calculating a correction amount.
  • the target data 213 includes data such as target component concentration and target temperature in hot metal (in molten steel) after dephosphorization, after decarburization, and during sublance measurement.
  • the input / output unit 22 has a function of acquiring a correction result such as a carbon concentration estimation result by the carbon concentration estimation unit 202 or a correction value of the blown oxygen amount by the correction amount calculation unit 203 and outputting the result to various output devices.
  • a correction result such as a carbon concentration estimation result by the carbon concentration estimation unit 202 or a correction value of the blown oxygen amount by the correction amount calculation unit 203 and outputting the result to various output devices.
  • the input / output unit 22 may output the instruction value after correction of the blown oxygen amount acquired from the correction amount calculation unit 203 to the converter blowing facility 10. Thereby, the blowing which reflected the instruction value after correction of the amount of blowing oxygen is performed. Further, the input / output unit 22 may cause the operator to display the estimated carbon concentration in the molten iron or the corrected instruction value of the blown oxygen amount.
  • the input / output unit 22 may further output to the converter blowing facility 10 information related to an instruction such as acid feeding or cold material input that is input by an operator who has viewed the displayed information. Further, the input / output unit 22 may output an estimation result or the like stored in the hot metal preliminary processing database 21.
  • the measurement control device 30 includes a hardware configuration such as a CPU, ROM, RAM, storage, and communication device.
  • the measurement control device 30 communicates with each device provided in the converter blowing facility 10 and has a function of controlling the entire operation of the converter blowing facility 10. For example, the measurement control device 30 controls the charging of the cold material and the auxiliary material to the converter 11 in accordance with an instruction from the hot metal pretreatment control device 20.
  • the measurement control device 30 acquires data obtained from each device of the converter blowing facility 10 such as the exhaust gas component analyzer 101 and the exhaust gas flow meter 102 and transmits the data to the hot metal preliminary treatment control device 20.
  • the data acquisition unit 201 acquires hot metal data 211, parameters 212 and target data 213 stored in the hot metal pretreatment database 21, and exhaust gas data output from the exhaust gas component analyzer 101 and the exhaust gas flow meter 102.
  • the data acquisition unit 201 may acquire data sequentially measured by the exhaust gas component analyzer 101 and the exhaust gas flow meter 102 during the dephosphorization process or may be acquired collectively after the dephosphorization process.
  • the data acquisition unit 201 outputs the acquired data to the carbon concentration estimation unit 202.
  • the carbon concentration estimation unit 202 estimates the carbon concentration in the hot metal after the dephosphorization process based on various data acquired by the data acquisition unit 201. Hereinafter, a method for estimating the carbon concentration by the carbon concentration estimating unit 202 will be described.
  • the carbon concentration in the hot metal after the dephosphorization treatment can be estimated from the material balance regarding the carbon in the hot metal before and after the dephosphorization treatment. That is, it is considered that the difference in the mass of carbon contained in the hot metal before and after the dephosphorization treatment coincides with the mass of carbon contained in the exhaust gas generated by the dephosphorization treatment (that is, the material balance is balanced).
  • the present inventors examined using such a material balance model for carbon to estimate the carbon concentration in hot metal after dephosphorization.
  • the mass (decarburization amount) of carbon contained in the exhaust gas generated by the dephosphorization process is calculated based on the exhaust gas data.
  • the decarburization amount ⁇ C offgas (ton) based on the exhaust gas data is represented by the following formula (2).
  • the decarburization amount wc [i] (g / sec) per unit time obtained from the exhaust gas data is calculated by the following equation (3).
  • CO [i + N] (%) is the CO concentration in the exhaust gas
  • CO 2 [i + N] (%) is the CO 2 concentration in the exhaust gas
  • V offgas [i] (Nm 3 / hr (NTP)) is the total exhaust gas.
  • Flow rate. CO [i] (%) and CO 2 [i] (%) can be acquired by the exhaust gas component analyzer 101.
  • V offgas [i] (Nm 3 / hr (NTP)) can be acquired by the exhaust gas flow meter 102.
  • i in square brackets [] represents the sampling period by the exhaust gas component analyzer 101 and the exhaust gas flow meter 102.
  • N in square brackets [] corresponds to an analysis delay by the exhaust gas component analyzer 101 (a time delay until the exhaust gas reaches the installation position of the exhaust gas component analyzer 101).
  • a specific value of the analysis delay N may be appropriately determined according to the installation position of the exhaust gas component analyzer 101 in the flue 12 or the like.
  • NTP means Normal Temperature Pressure.
  • the value obtained by multiplying V offgas [i] by 1000 is divided by 3600 in order to convert the unit to (L / sec). Also, the reason why it is divided by 22.4 (L / mol) is to convert it into the number of moles. 12 is the atomic weight of carbon.
  • the amount of decarburization (hereinafter, the amount of decarburization based on component change) ⁇ C c (ton) based on the component measurement results of the carbon concentration in the hot metal before and after the dephosphorization treatment is expressed by the following equation (4). Indicated.
  • C HM (%) is the carbon concentration in the hot metal before dephosphorization
  • W HM (ton) is the weight of the hot metal before dephosphorization
  • C SC (%) is in the converter 11 before dephosphorization.
  • the carbon concentration in the scrap charged in the reactor, W SC (ton) is the weight of the scrap charged in the converter 11 before the dephosphorization process, and C CM (%) is in the cold before the dephosphorization process.
  • the carbon concentration, W CM (ton) is the weight of the cold water before the dephosphorization treatment
  • C sub, j (%) is the carbon concentration in the auxiliary raw material j introduced into the converter 11 before the dephosphorization treatment
  • W sub, j (ton) is the weight of the auxiliary raw material j put into the converter 11 before the dephosphorization process.
  • C deP (%) is the carbon concentration in the hot metal after the dephosphorization treatment.
  • the decarburization amount ⁇ C offgas based on the exhaust gas data and the decarburization amount ⁇ C C based on the component change can be equal. That is, the relationship between the decarburization amount [Delta] C C based on the decarburization amount ⁇ C offgas and component change based on exhaust gas data is shown as the following equation (5).
  • the carbon concentration C deP in the hot metal after the dephosphorization treatment is expressed as the following formula (6) by applying the above formulas (2) to (4) to the above formula (5).
  • the carbon concentration C deP in molten iron after the dephosphorization process it is possible to calculate theoretically.
  • the carbon concentration C deP in the hot metal after the dephosphorization treatment based on the exhaust gas data obtained by the above formula (6) is the actual value C deP, a of the carbon concentration obtained from the hot metal sampled after the dephosphorization treatment.
  • the present inventors have found that there is a large deviation from This is because the decarburization amount ⁇ C offgas based on the exhaust gas data calculated in the above formulas (2) and (3) includes many errors.
  • the above error is mainly caused by a measurement error by the exhaust gas flow meter 102.
  • dust such as soot generated from the converter 11 may enter the piping.
  • the passage of the exhaust gas in the pipe becomes unstable, and the measurement error by the exhaust gas flow meter 102 increases. Since the internal state of the piping of the exhaust gas flow meter 102 changes every moment, it is difficult to suppress the measurement error itself caused by the exhaust gas flow meter 102.
  • the above equation (5) is incorporated by incorporating a correction term ⁇ C correct (ton), which is a correction value for correcting the decarburization amount ⁇ C offgas based on the exhaust gas data. and conceived to improve the estimation accuracy of the carbon concentration C deP in molten iron after the dephosphorization treatment obtained by (6).
  • the above equation (5) is expressed as the following equation (7) by incorporating the correction term ⁇ C correct .
  • the estimation model of the correction term ⁇ C correct is constructed by various statistical methods.
  • the correction term ⁇ C correct according to the present embodiment is an objective variable calculated by a regression equation using various operation factors X as explanatory variables, which is obtained by a known multiple regression analysis method.
  • the correction term ⁇ C correct is expressed as the following formula (8).
  • ⁇ k is a regression coefficient corresponding to the k-th operation factor X k
  • ⁇ 0 is a constant.
  • Specific examples of the operation factor X include those shown in Table 1 below. However, the operation factor shown in the following Table 1 is merely an example, and any operation factor X may be considered in the estimation of the correction term ⁇ C correct . In addition, all or part of the operation factors included in Table 1 below may be used for estimating the correction term ⁇ C correct .
  • the present inventors have improved the estimation accuracy of the carbon concentration C deP in the molten iron after dephosphorization. Found.
  • the operating factors which reflect the slag formation conditions of the slag can be further improved estimation accuracy of the carbon concentration C deP in molten iron after the dephosphorization treatment, slag formation condition of slag in the converter 11 during dephosphorization treatment This is thought to reflect decarbonation efficiency.
  • the decarbonation efficiency is an index indicating the efficiency of the reaction between oxygen blown into the converter 11 and carbon in the hot metal. When the blown oxygen touches the hot metal exposed on the hot water surface, a decarburization reaction occurs. However, in the dephosphorization process, phosphorus is preferentially taken into the slag. Therefore, a large amount of slag exists on the surface of the hot metal.
  • the slag hatching situation may have some influence on the decarburization reaction. That is, it is considered that the hatching state of the slag in the converter 11 affects the ease of the decarburization reaction, that is, the decarbonation efficiency.
  • the operating factor reflecting the slag hatching status is reflected in the correction term ⁇ C correct to take into account the effect of the change in the decarbonation efficiency of the converter 11 during the dephosphorization process, and the molten iron after the dephosphorization process.
  • the carbon concentration CdeP in the medium can be estimated. Accordingly, the present inventors that the carbon concentration C deP estimation accuracy of the molten iron after the dephosphorization process is improved and conceived.
  • the operating factors that reflect the slag hatching status during the dephosphorization process include, for example, a sound meter value (db) and a measured value (m) of microwave slag height. .
  • the sound meter value is a value output by the sound meter 111.
  • the sound meter 111 acquires the sound in the converter 11 as an acoustic signal via the sound collection microphone 112 and outputs it as a sound meter value.
  • the sound meter value varies depending on the slag hatching condition in the converter 11. By using the sound meter value as an operation factor, the slag hatching state can be reflected in the correction term ⁇ C correct .
  • the slag level is a value output from a slag level measuring device (not shown).
  • the slag level measuring apparatus acquires the microwave irradiated into the converter 11 via an antenna, and analyzes the slag level from the microwave.
  • the slag level varies depending on the hatching state of the slag in the converter 11. Similar to the sound meter value, the slag hatching state can be reflected in the correction term ⁇ C correct by using the slag level as an operation factor.
  • the measurement results obtained by these measurement methods may be used as operation factors.
  • the sound meter value it has been found that it is preferable to use the sound meter value as an operating factor that reflects the slag hatching status.
  • the estimation model of the correction term ⁇ C correct is constructed by multiple regression analysis, but the estimation model may be constructed by other statistical methods.
  • the other statistical method may be, for example, a neural network or a statistical method using a machine learning algorithm such as a random forest.
  • the estimation method of the correction term ⁇ C correct has been described above.
  • the carbon concentration C deP in the hot metal after the dephosphorization treatment is obtained by applying the above formulas (2) to (4) and the above formula (8) to the above formula (7) as shown in the following formula (9). expressed.
  • the carbon concentration estimation unit 202 estimates the carbon concentration C deP in the hot metal after the dephosphorization process by substituting various data acquired by the data acquisition unit 201 into the above equation (9).
  • the carbon concentration estimation unit 202 outputs the estimated carbon concentration C deP to the correction amount calculation unit 203.
  • the carbon concentration estimation unit 202 may output the estimated carbon concentration C deP to the input / output unit 22.
  • the correction amount calculation unit 203 is included in the target data 213 based on a comparison result between the carbon concentration C deP estimated by the carbon concentration estimation unit 202 and the target carbon concentration C aim after the dephosphorization process included in the target data 213.
  • the amount of oxygen blown in the decarburization process is corrected.
  • the target carbon concentration C aim after the dephosphorization treatment and the blown oxygen amount O 2, aim in the decarburization treatment are amounts determined by static control before the dephosphorization treatment.
  • the correction amount calculation unit 203 calculates the correction amount ⁇ O 2, correct of the blown oxygen amount using the above-described estimation result and the like. Then, the correction amount calculation unit 203 updates the blown oxygen amount O2 , aim initially determined using the correction amount ⁇ O2 , correct of the blown oxygen amount, and updates the blown oxygen amount O2 , corrected after the update. To get.
  • the correction amount of the oxygen amount can be calculated by the following equation (10).
  • ⁇ is a parameter.
  • a theoretical value corresponding to the chemical equivalent of oxygen reacting with carbon can be substituted for this parameter.
  • the amount of oxygen corresponding to the difference between the estimated carbon concentration C deP and the target carbon concentration C aim is calculated.
  • the correction amount calculation unit 203 outputs information about the corrected oxygen injection amount O 2 and corrected to the input / output unit 22.
  • the correction amount calculation unit 203 may correct not only the initially determined blowing oxygen amount O 2, im but also the initial amount of cold material. For example, when the corrected blown oxygen amount O2 , corrected is smaller than the initially determined blown oxygen amount O2 , aim , the hot metal temperature of the converter 11 can be lowered in the decarburization process. Therefore, the correction amount calculation unit 203 performs a correction to reduce the amount of cold material put into the converter 11 based on, for example, the corrected blown oxygen amount O 2, corrected and the hot metal temperature (molten steel temperature). May be. Thereby, even when the amount of oxygen blown in the decarburization process is corrected to be small after the dephosphorization process, the initially determined target molten steel temperature can be reached. The correction amount calculation unit 203 outputs information about the corrected cold material amount to the input / output unit 22.
  • FIG. 2 is a view showing a flowchart of a hot metal preliminary processing method by the hot metal preliminary processing system 1 according to the present embodiment.
  • FIG. 2 the flow of the hot metal pretreatment method by the hot metal pretreatment system 1 according to the present embodiment will be described.
  • Each process shown in FIG. 2 corresponds to each process executed by the hot metal preliminary process control device 20 shown in FIG. Therefore, the details of each process shown in FIG. 2 are omitted, and only an outline of each process is described.
  • the data acquisition unit 201 acquires hot metal data and exhaust gas data (step S101). Specifically, the data acquisition unit 201 acquires hot metal data 211, parameters 212, and target data 213 shown in FIG. 1, and exhaust gas data measured by the exhaust gas component analyzer 101 and the exhaust gas flow meter 102.
  • the carbon concentration estimation unit 202 estimates the carbon concentration in the hot metal after the dephosphorization process based on the acquired various data (step S103). Specifically, the carbon concentration estimation unit 202 estimates the carbon concentration in the hot metal after the dephosphorization process by substituting various data included in the hot metal data and the exhaust gas data into the above equation (9). In the estimation of the correction term ⁇ C correct in the above equation (9), various operating factors can be selected. For example, in order to further improve the carbon concentration in the hot metal after the dephosphorization treatment, it is preferable to select an operation factor that reflects the slag hatching state in the estimation of ⁇ C correct .
  • the correction amount calculation unit 203 uses the converter 11 in the decarburization process based on the comparison result between the estimated carbon concentration in the hot metal after the dephosphorization process and the target carbon concentration in the hot metal after the dephosphorization process.
  • the amount of oxygen blown in is corrected (step S105).
  • it is preferable that the amount of cold material during the decarburization process is corrected in order to match the hot metal temperature with the target hot metal temperature after the dephosphorization process in conjunction with the correction of the blown oxygen amount.
  • the input / output unit 22 issues an instruction to the converter blowing equipment 10 so as to inject oxygen and supply the cold material based on the corrected oxygen amount and cold material amount.
  • the converter blowing facility 10 performs a process relating to the feeding of the acid and the cooling material to the converter 11 according to the instruction.
  • both the amount of oxygen blown into the converter 11 and the amount of cold material to be injected are corrected based on the estimated carbon concentration in the hot metal after the dephosphorization treatment.
  • the present embodiment is not limited to such an example.
  • only the amount of blown oxygen so that the carbon concentration in the molten steel satisfies the target value may be corrected.
  • step S105 based on the estimated carbon concentration in the molten iron after the dephosphorization treatment, only the blown oxygen amount that the carbon concentration in the molten steel satisfies the target value may be calculated.
  • the corrected decarburization in which the decarburization amount obtained using the exhaust gas data is corrected by the correction value expressed by the regression equation using the operation factor at the time of dephosphorization as an explanatory variable.
  • the amount is used to estimate the carbon concentration in the hot metal after dephosphorization.
  • the decarburization efficiency in the converter 11 is set to the correction term described above. It can be reflected. Thereby, the carbon concentration in the hot metal after the dephosphorization treatment can be estimated with higher accuracy.
  • the amount of oxygen blown in during the decarburization process is corrected using the estimation result of the carbon concentration.
  • the configuration shown in FIG. 1 is merely an example of the hot metal pretreatment system 1 according to the present embodiment, and the specific configuration of the hot metal pretreatment system 1 is not limited to this example.
  • the hot metal pretreatment system 1 only needs to be configured so as to realize the functions described above, and can take any configuration that can be generally assumed.
  • all the functions of the hot metal preliminary processing control device 20 may not be executed by one device, but may be executed by cooperation of a plurality of devices.
  • one device having only one or a plurality of functions of the data acquisition unit 201, the carbon concentration estimation unit 202, and the correction amount calculation unit 203 can communicate with other devices having other functions.
  • a function equivalent to the hot metal pretreatment control device 20 shown in the figure may be realized.
  • a computer program for realizing each function of the hot metal preliminary processing control device 20 according to the present embodiment shown in FIG. 1 and mount it on a processing device such as a PC.
  • a computer-readable recording medium storing such a computer program can be provided.
  • the recording medium is, for example, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, or the like.
  • the above computer program may be distributed via a network, for example, without using a recording medium.
  • the decarburization amount ⁇ C c based on the component change, the decarburization amount ⁇ C offgas and the correction term ⁇ C correct based on the exhaust gas data were calculated using the exhaust gas data, the hot metal data, and the operation factors.
  • the decarburization amount ⁇ C offgas based on the exhaust gas data was calculated using the above formulas (2) and (3), and the correction term ⁇ C correct was calculated using the above formula (8). Further, the decarburization amount ⁇ C c based on the component change was calculated using the formula (4).
  • the decarburization amount ⁇ C c based on the component change, the decarburization amount ⁇ C offgas based on the exhaust gas data, and the correction term ⁇ C correct have the relationship of the formula (7).
  • the decarburization amount ⁇ C c based on the component change and the decarburization amount ⁇ C offgas based on the exhaust gas data were calculated using the exhaust gas data and the hot metal data.
  • the calculation method of the decarburization amount ⁇ C offgas based on the exhaust gas data and the decarburization amount ⁇ C c based on the component change is the same as in this embodiment.
  • the correction term ⁇ C correct is not used, and the relationship of the above formula (5) is assumed between the decarburization amount ⁇ C c based on the component change and the decarburization amount ⁇ C offgas based on the exhaust gas data.
  • the actual value of the carbon concentration in the hot metal sampled from the converter after the dephosphorization treatment is included in C deP in the above formula (4) in order to verify the effectiveness of the correction term ⁇ C correct. Is substituted. That is, in this embodiment, the decarburization amount ⁇ C c based on the component change is a value obtained based on the actual value.
  • Example 2 shows a list of data and operating factors used in the estimation of the carbon concentration in the hot metal after the dephosphorization treatment in Example 1, Example 2, and Comparative Example. In this example, a sound meter value was used as an operation factor reflecting the slag hatching status.
  • the decarburization amount ⁇ C offgas (corrected decarburization amount obtained by adding the correction term ⁇ C correct to the exhaust gas data calculated in Example 1, Example 2 and Comparative Example)
  • the error (estimation error) from the decarburization amount ⁇ C c based on the component change was calculated, respectively, and the standard deviation ⁇ of the estimation error was obtained. It can be said that as the standard deviation ⁇ is smaller, the estimation error is smaller, that is, the effectiveness of the correction term ⁇ C correct is higher.
  • the carbon concentration C deP estimated using the above formula (9) in Example 1 and Example 2 and the hot metal sampled from the converter after the dephosphorization treatment An error from the actual value of the carbon concentration was calculated, and a standard deviation ⁇ of the estimation error was obtained. It can be said that the smaller the standard deviation ⁇ , the smaller the estimation error, that is, the higher the estimation accuracy.
  • FIG. 3 is a diagram illustrating an estimation error of the decarburization amount ⁇ C offgas based on the exhaust gas data in the comparative example.
  • FIG. 4 is a diagram showing an estimation error of the decarburization amount ⁇ C offgas + correction term ⁇ C correct based on the exhaust gas data in the first embodiment.
  • FIG. 5 is a diagram showing an estimation error of the decarburization amount ⁇ C offgas + correction term ⁇ C correct based on the exhaust gas data in the second embodiment.
  • the x-axis shows the decarburization amount based on the actual value obtained by the component analysis of the carbon concentration
  • the y-axis shows the decarburization amount based on the exhaust gas data (including the correction term ⁇ C correct ).
  • the standard deviation ⁇ of the estimation error in Comparative Example 1 was 0.80, whereas the standard deviation ⁇ of the estimation error in Example 1 was 0.51.
  • the standard deviation ⁇ of the estimation error in was 0.40. From the result, it can be confirmed that the error of the decarburization amount with respect to the actual data is reduced by the correction by the correction term ⁇ C correct . Furthermore, since the standard deviation ⁇ in the second embodiment is smaller than the standard error ⁇ in the first embodiment, it is more effective to incorporate an operation factor that reflects the slag hatching state in the correction term ⁇ C correct. It was shown that.
  • FIG. 6 is a diagram illustrating an estimation error of the carbon concentration CdeP in the first embodiment.
  • FIG. 7 is a diagram showing an estimation error of the carbon concentration CdeP in Example 2.
  • the x-axis shows the actual value by the component analysis of the carbon concentration
  • the y-axis shows the estimated value of the carbon concentration estimated using the hot metal pretreatment method according to the present embodiment.
  • the standard deviation ⁇ of the estimation error in Example 1 was 0.15, and the standard deviation ⁇ of the estimation error in Example 2 was 0.11. Since all the standard deviations ⁇ are low, it can be said that the estimation accuracy of the carbon concentration C deP is high. In addition, since the standard deviation ⁇ in Example 2 was smaller than the standard error ⁇ in Example 1, the estimation accuracy of the carbon concentration C deP can be improved by using an operation factor that reflects the slag hatching status. It was confirmed that it could be further increased.
  • the carbon concentration C deP can be estimated with higher accuracy in this example by introducing the correction term ⁇ C correct than in the comparative example.
  • the operational factors that reflect the slag formation conditions of the slag to estimate the correction term [Delta] C correct, it has been found that it is possible to further enhance the estimation accuracy of the carbon concentration C deP.
  • the hot metal preliminary treatment method according to this embodiment was verified whether or not the hot metal preliminary treatment method according to this embodiment can be applied to operations using past operation result data. Specifically, with respect to the past operation result data, the estimation result of the carbon concentration in the hot metal after the dephosphorization treatment obtained by the hot metal pretreatment method according to the embodiment, the amount of injected oxygen during the decarburization treatment, and The correction result of the amount of cold material was verified.
  • Table 3 is a table showing an application example of the estimation result of the carbon concentration and the correction result such as the oxygen amount to the operation result data.
  • Table 3 the history of the planned value, the actual value, and the estimated value or the corrected instruction value for each of the carbon concentration in the hot metal, the hot metal temperature, the amount of blown oxygen, and the amount of cold material is shown.
  • the planned value is a value estimated in advance by static control before dephosphorization.
  • the actual value is a value measured or set in the past operation.
  • the estimated value and the corrected instruction value are an estimated value of the carbon concentration obtained by the hot metal pretreatment method according to the present embodiment, and an indicated value of the corrected amount of the blown oxygen amount and the cold material amount.
  • the instruction value for the correction amount of the blown oxygen amount corresponds to, for example , the corrected blown oxygen amount O 2 and corrected obtained based on the above formula (10).
  • the carbon concentration in the hot metal at the end of the dephosphorization treatment is 4.0%, and when the sublance is measured during the decarburization treatment, the carbon concentration in the molten steel is 0. It is assumed that the carbon concentration (target carbon concentration) in the molten steel at the end of the decarburization process is 0.1%. Accordingly, the blown oxygen amount is 7.0 Nm 3 / ton at the start of the decarburization process and 25.0 Nm 3 / ton (7. 0 + 18.0), and is determined to be 30.0 Nm 3 / ton (7.0 + 18.0 + 5.0) at the end of the decarburization process.
  • the value of the amount of cold material is 2.0 ton during dephosphorization blowing and 5.0 ton from the start of decarburization treatment to the time of sublance measurement.
  • the carbon concentration in the molten steel at the time of sublance measurement in actual operation was 0.10%.
  • the hot metal temperature at the time of measuring the sublance remained at the planned value of 1600 ° C.
  • the carbon concentration in the molten steel was 0.04%, which was lower than the original target carbon concentration. This is presumably because the carbon concentration in the hot metal at the end of the dephosphorization process was lower than the originally determined 4.0%.
  • the carbon concentration in the hot metal at the end of the dephosphorization process is estimated to be 3.5%. Further, according to this estimation result, the oxygen amount at the time of the sublance measurement from the start of the decarburization process is corrected from 18.0 to 13.0 Nm 3 / ton. Further, the amount of cold material is corrected to 2.5 ton according to the estimation result of carbon concentration and the correction result of oxygen amount. If the operation is performed based on this modification, the carbon concentration at the time of sublance measurement will satisfy the 0.5% previously assumed, so the carbon concentration in the molten steel at the end of the decarburization process should be blown down.
  • the target carbon concentration can be made closer to the target carbon concentration. That is, by applying the hot metal preliminary treatment method according to the present embodiment to actual operations, the carbon concentration in the molten steel can be more accurately hit the target carbon concentration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Le problème à résoudre dans le cadre de la présente invention consiste à estimer la concentration en carbone dans la fonte brute en fusion après déphosphoration avec une grande précision. La solution consiste en un procédé de prétraitement de fonte brute en fusion utilisant un four de convertisseur comprenant : une étape d'acquisition de données consistant à acquérir des données de fonte brute en fusion se rapportant à de la fonte brute en fusion avant déphosphoration et des données de gaz d'échappement comportant les composants du gaz d'échappement évacués du four de convertisseur pendant la déphosphoration et une vitesse de circulation des gaz d'échappement ; et une étape d'estimation de la concentration en carbone consistant à corriger, à l'aide d'une valeur de correction calculée sur la base de facteurs d'opération pendant la déphosphoration, la quantité de décarbonation pendant la déphosphoration étant calculée sur la base des données de gaz d'échappement, et à estimer la concentration en carbone après la déphosphoration sur la base de la quantité de décarbonation corrigée et des données de fonte brute en fusion.
PCT/JP2017/009453 2016-03-23 2017-03-09 Procédé de prétraitement de fonte brute en fusion et dispositif de commande de prétraitement de fonte brute en fusion Ceased WO2017163902A1 (fr)

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