WO2022004119A1 - 転炉吹錬制御方法及び転炉吹錬制御システム - Google Patents
転炉吹錬制御方法及び転炉吹錬制御システム Download PDFInfo
- Publication number
- WO2022004119A1 WO2022004119A1 PCT/JP2021/017239 JP2021017239W WO2022004119A1 WO 2022004119 A1 WO2022004119 A1 WO 2022004119A1 JP 2021017239 W JP2021017239 W JP 2021017239W WO 2022004119 A1 WO2022004119 A1 WO 2022004119A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- converter
- hot metal
- blowing
- amount
- Prior art date
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004364 calculation method Methods 0.000 claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 30
- 239000001301 oxygen Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims description 211
- 238000003723 Smelting Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000000295 emission spectrum Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 5
- 229910052742 iron Inorganic materials 0.000 abstract 3
- 238000005259 measurement Methods 0.000 description 35
- 239000007789 gas Substances 0.000 description 22
- 238000002347 injection Methods 0.000 description 20
- 239000007924 injection Substances 0.000 description 20
- 230000003068 static effect Effects 0.000 description 20
- 238000009529 body temperature measurement Methods 0.000 description 11
- 239000004071 soot Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 5
- 238000013178 mathematical model Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 238000006114 decarboxylation reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000005469 synchrotron radiation Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/466—Charging device for converters
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/28—Arrangements of monitoring devices, of indicators, of alarm devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
-
- 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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
- F27D2021/026—Observation or illuminating devices using a video installation
Definitions
- the present invention relates to a converter smelting control method and a converter smelting control system for controlling the temperature and component concentration of molten steel at the end of smelting to target values.
- the converter operation is a steelmaking process in which molten steel is obtained by supplying oxygen to the main raw material consisting of hot metal and scrap charged in the converter and performing oxidative refining (blown smelting).
- the blowing control is performed by combining the static control and the dynamic control.
- static control the amount of oxygen supplied and the amount of cold or heat-heating material input required to control the temperature and component concentration of molten steel to the target value are blown using a mathematical model based on the heat balance and mass balance. Decide before the start.
- the mathematical model used for static control consists of two types of calculations: heat balance calculation and oxygen balance calculation. Of these, in the heat balance calculation, the amount of cold material or heat-increasing material input is calculated so that the total amount of heat input into the converter and the total amount of heat output are equal.
- the formula used for heat balance calculation consists of a heat input determination term, a heat output determination term, a cooling term or a heat rise term, an error term, and a temperature correction term by the operator.
- a method for obtaining an appropriate value has been studied.
- the temperature drop of molten steel in the subsequent smelting is based on the cooling curve obtained from the surface temperature and time information of the refractory lining of the converter measured by the radiation thermometer. Is disclosed as a method of predicting and incorporating into the heat balance calculation in static control.
- the decarboxylation efficiency attenuation constant and the maximum decarboxylation efficiency that characterize the decarboxylation characteristics during blowing are estimated by utilizing the exhaust gas information, and the temperature and carbon concentration of the molten steel are estimated using the estimation results.
- the method of estimating is disclosed. According to the method disclosed in Patent Document 2, the heat of reaction generated in the decarburization reaction is accurately reflected in the estimation of the temperature of the molten steel, so that the accuracy of controlling the temperature of the molten steel in the blow stop is improved. However, since there are factors other than the decarburization reaction that affect the temperature of the molten steel, the accuracy of controlling the temperature of the molten steel in the blow stop has not reached a satisfactory level.
- the present invention has been made in view of the above problems, and an object thereof is a converter smelting control method and a converter smelting control system capable of accurately controlling the temperature of molten steel at the end of smelting to a target value. Is to provide.
- the amount of oxygen supplied and the cold material or heat-heating material for controlling the temperature and component concentration of the molten steel at the end of blowing in the converter to the target values. It is a converter blowing control method that controls the blowing in the converter based on the calculated input oxygen amount and the input amount of cold material or heat-heating material. Therefore, as the charge hot metal temperature used in the heat balance calculation, the temperature of the hot metal measured during the period in which the hot metal used as the raw material for blowing, which is the target of the heat balance calculation, is charged into the converter. Use.
- the converter blowing control method calculates the heat balance during blowing based on the operating conditions and measured values of the converter obtained at the start of blowing in the converter and during blowing. And by sequentially performing material balance calculation, the temperature and component concentration of the molten metal at the time of the progress of blowing are estimated sequentially, and the blowing in the converter is controlled based on the estimated temperature and component concentration of the molten metal.
- the charge hot metal temperature used in the heat balance calculation was measured during the period in which the hot metal used as the raw material for blowing smelting, which is the target of the heat balance calculation, was charged into the converter. The temperature of the hot metal is used.
- the charge hot metal temperature used in the heat balance calculation is measured by using a non-contact optical method when the hot metal used as the raw material for blowing, which is the target of the heat balance calculation, flows into the converter from the hot metal holding container. It is advisable to use the temperature of the hot metal.
- the non-contact optical method is a method of measuring the emission spectrum emitted from the hot metal and calculating the temperature of the hot metal from the radiation energy ratios of two different wavelengths selected from the measured emission spectrum.
- both ⁇ 1 and ⁇ 2 are in the range of 400 nm to 1000 nm, and the absolute value of the difference between ⁇ 1 and ⁇ 2 is 50 nm or more and 600 nm or less.
- both ⁇ 1 and ⁇ 2 are in the range of 400 nm to 1000 nm, and the absolute value of the difference between ⁇ 1 and ⁇ 2 is 200 nm or more and 600 nm or less.
- the temperature of the hot metal during the period in which the hot metal used as a raw material for blowing in the converter is charged into the converter is used as the charging hot metal temperature.
- a temperature measuring instrument that measures optically and the charged hot metal temperature measured by the temperature measuring instrument
- a computer that calculates the amount of oxygen supplied to the furnace and the amount of cold or heat-heating material input by heat balance calculation and material balance calculation, and the amount of oxygen supplied to the converter and the cold or heat-heating material calculated by the calculator. It is equipped with a control device that controls blowing in a converter based on the input amount of the converter.
- the converter blowing control system measures the two-color temperature information of the hot metal during the period when the hot metal used as a raw material for blowing in the converter is charged into the converter.
- the first computer that calculates the temperature of the hot metal as the charging hot metal temperature using the two-color temperature information measured by the spectroscopic camera, and the charging hot metal temperature calculated by the first computer.
- heat balance calculation and material balance calculation the amount of oxygen supplied to the converter and the amount of cold or heat-heating material input to control the temperature and component concentration of molten steel at the end of blowing in the converter to the target value.
- It is provided with a second computer for calculation and a control device for controlling blowing in the converter based on the amount of oxygen supplied to the converter and the amount of cold material or heating material input calculated by the second computer. ..
- the temperature of the hot metal during the period in which the hot metal used as a raw material for blowing in the converter is charged into the converter is used as the charging hot metal temperature.
- a temperature measuring instrument that measures optically
- a computer that sequentially calculates the temperature of molten steel during smelting using the charged hot metal temperature measured by the temperature measuring instrument, and a molten steel during smelting calculated by the computer. It is equipped with a control device that controls blowing in a converter based on the temperature of the above.
- the converter blowing control system measures the two-color temperature information of the hot metal during the period in which the hot metal used as a raw material for blowing in the converter is charged into the converter.
- the first computer that calculates the temperature of the hot metal as the charging hot metal temperature using the two-color temperature information measured by the spectroscopic camera, and the charging hot metal temperature calculated by the first computer. It includes a second computer that sequentially calculates the temperature of the molten steel during smelting, and a control device that controls smelting in the converter based on the temperature of the molten steel during smelting calculated by the second computer.
- the temperature of the molten steel at the end of smelting can be accurately controlled to the target value.
- FIG. 1 is a schematic diagram showing a configuration of a converter blowing control system according to an embodiment of the present invention.
- FIG. 2 from measuring the temperature of the hot metal filled in the charging pot using a thermocouple to measuring the temperature of the hot metal when flowing from the charging pot into the converter using a two-color thermometer.
- FIG. 3 is a diagram showing the relationship between the intermediate estimated temperature and the intermediate actual temperature in the invention example and the comparative example when 300 to 350 tons of hot metal is blown using a 350 ton converter.
- FIG. 4 is a diagram showing the temperature error of the hot metal with respect to the target value at the end of the hot metal in the invention example and the comparative example when 300 to 350 tons of hot metal is blown using a 350 ton converter.
- the blowing is started and advanced based on the determined amount of oxygen supply and the amount of cold material added, and after continuing for a certain period of time (for example, 80 to 90% of the amount of oxygen supplied calculated by static control is blown).
- a certain period of time for example, 80 to 90% of the amount of oxygen supplied calculated by static control is blown.
- measure the temperature and component concentration of the molten metal using a sublance.
- the amount of oxygen supplied and the cold material determined by static control are input using a mathematical model based on the temperature and component concentration of the molten metal measured using the sublance, the heat balance, the mass balance, and the reaction model. Correct the amount and finally determine the amount of oxygen supplied to the blow stop and the amount of cold material to be added.
- the formula for calculating the heat balance in static control is composed of, for example, a heat input determination term, a heat output determination term, a cooling term or a temperature rise term, an error term, and a temperature correction term by the operator.
- the heat input determination term includes a term representing the sensible heat of the hot metal to be charged.
- the sensible heat of the hot metal to be charged is calculated by (specific heat of the hot metal) x (mass of the hot metal to be charged) x (temperature of the hot metal to be charged).
- specific heat of the hot metal the physical property values described in the handbook or the like are used.
- the mass of the hot metal to be charged is, for example, the weight of the charging pot (hot metal holding container) filled with the hot metal measured by the load cell or the like before the hot metal charging and the empty charging pot measured by the load cell or the like after the hot metal charging. Use the difference from the weight.
- a value measured by immersing a thermocouple in the hot metal filled in the charging pot is used as the temperature of the hot metal charged (charged hot metal temperature).
- the inventors of the present invention have found that the sensible heat of the hot metal charged in the heat balance calculation in static control and dynamic control is the reason why the control accuracy of the temperature of molten steel in blow-off does not improve. It was found that the value was inaccurate. In particular, it has been found that it may not always be appropriate to use the above-mentioned measured values of the temperature of the hot metal when calculating the sensible heat of the hot metal to be charged.
- the temperature of the hot metal is measured after the hot metal is charged into the charging pot and the slag is removed.
- the elapsed time from the temperature measurement until the hot metal is charged into the converter varies greatly depending on the operating conditions of the converter and the steelmaking process after the converter. For example, after measuring the temperature of the hot metal, it may be charged into the converter immediately to start blowing, or after measuring the temperature of the hot metal, it may be filled in the charging pot as it is and wait until it is charged into the converter. May be forced. That is, the actual temperature of the hot metal charged differs due to the difference in the amount of temperature drop of the hot metal during the period from the measurement of the temperature of the hot metal to the charging into the converter.
- the temperature distribution of the hot metal will occur in the depth direction of the charging pot due to heat convection.
- the depth of the hot metal bath at the time of hot metal filling is on the order of several meters, whereas the depth of immersion of the thermocouple at the time of temperature measurement is several tens of centimeters. Therefore, even if the temperature of the hot metal is measured again in the charging pot before charging into the converter, the influence of the temperature distribution of the hot metal is not sufficiently reflected in the temperature measurement value, which causes an error.
- the state of the charging pot used also affects the amount of temperature drop of the hot metal during the period from the measurement of the hot metal temperature to the charging of the converter. For example, a charging pot with a high ratio of filling time (time in which the hot metal is filled within a certain period) has a small amount of temperature drop of the hot metal, and conversely, a charging pot with a low ratio of filling time has a hot metal. The amount of temperature drop is large.
- the hot metal temperature measured in the converter at the end of the desiliconization / dephosphorization treatment or during the hot water discharge is corrected by the temperature drop of the hot metal during the hot water discharge.
- the problem is the same as the above, for example, the time from hot water discharge to charging varies greatly depending on the operating conditions.
- the inventors of the present invention measured the charging hot metal temperature used in the heat balance calculation during the period in which the hot metal used as the raw material for blowing, which is the object of the heat balance calculation, was charged into the converter. I decided to use the temperature of the hot metal. As a result, the accuracy of the heat balance calculation is improved as compared with the conventional case, and the temperature of the molten steel can be accurately controlled to the target value.
- the measured value is obtained after the influence of the waiting time in the charging pot is reflected, so that the above problem is solved.
- a temperature measurement method a method of immersing a thermocouple or the like in the injection flow when the hot metal flows into the converter from the charging pot can be considered, but it is a large-scale facility for immersing the thermocouple in the injection flow. Is required. Therefore, it is preferable to adopt a non-contact optical method capable of measuring the temperature more easily.
- a temperature measurement method using a two-color thermometer, a radiation thermometer, a thermoviewer, or the like can be exemplified. Further, when the temperature is measured by a non-contact optical method, accurate measurement may be difficult because the slag is floating on the bath surface in the stationary hot metal filled in the charging pot. On the other hand, if the measurement is performed on the injection flow when flowing into the converter from the charging pot, a portion where the hot metal surface is exposed appears, so that more accurate measurement becomes possible.
- a method of measuring the emission spectrum emitted from the hot metal and calculating the temperature from the radiation energy ratios of two different wavelengths selected from the obtained emission spectrum that is, a two-color thermometer is used.
- the method used is more preferred.
- the emissivity of the injection flow when flowing into the converter from the charging pot, which is the object of temperature measurement in the present invention, may fluctuate depending on the measurement conditions.
- ⁇ 1 and ⁇ 2 Assuming that the above two different wavelengths are ⁇ 1 and ⁇ 2 ( ⁇ 1 ⁇ 2), it is preferable to select the wavelength so that ⁇ 1 and ⁇ 2 satisfy the following relationship. That is, it is preferable that both ⁇ 1 and ⁇ 2 are in the range of 400 nm to 1000 nm, and the absolute value of the difference between ⁇ 1 and ⁇ 2 is 50 nm or more and 600 nm or less. Even in the method using a two-color thermometer, a measurement error occurs when the emissivity of two emission spectra having different wavelengths does not fluctuate in a proportional relationship with each other.
- the stray light from the oxide film on the hot metal surface and the furnace wall which is a factor of the fluctuation of the emissivity ratio R, has a large influence on the long wavelength side where the emissivity is relatively small. It is considered to be. Therefore, it is preferable to select the detection wavelength on the short wavelength side having a large emissivity.
- both ⁇ 1 and ⁇ 2 within the range of 400 nm to 1000 nm.
- the wavelength is less than 400 nm, it is difficult to detect the radiant energy with a normal spectroscopic camera because the wavelength is short.
- the wavelength exceeds 1000 nm, the influence of the emissivity ratio fluctuation becomes large because the wavelength is long.
- the absolute value of the difference between ⁇ 1 and ⁇ 2 is 50 nm or more and 600 nm or less. When the absolute value of the difference between ⁇ 1 and ⁇ 2 is less than 50 nm, the wavelengths of ⁇ 1 and ⁇ 2 are close to each other, which makes spectroscopy difficult with a normal spectroscopic camera.
- the absolute value of the difference between ⁇ 1 and ⁇ 2 is 200 nm or more and 600 nm or less because the influence of the fluctuation of the emissivity ratio R becomes small.
- the emissivity ratio R may be determined in advance based on an experiment or a literature value, and the measured value of the hot metal temperature may be corrected by the predetermined emissivity ratio R.
- a measurement error may occur even if the measured value of the hot metal temperature is corrected by a predetermined emissivity ratio R. For example, the intensity of the light emitted from the hot metal is attenuated by the soot generated by the reaction between the hot metal and oxygen in the atmosphere when the hot metal is charged.
- the inventors of the present invention further examined measures for reducing the influence of the above-mentioned soot and the like and enabling more accurate temperature measurement.
- the inventors of the present invention have focused on the fact that when soot and flame are measured, the radiant energy greatly differs depending on the wavelength in the wavelength range of 400 to 1000 nm.
- the upper and lower limit thresholds are set for the radiant energies I ( ⁇ 1) and I ( ⁇ 2) of ⁇ 1 and ⁇ 2, respectively, and the measured radiant energy value is measured only when I ( ⁇ 1) and I ( ⁇ 2) fall within the upper and lower limit threshold values.
- I decided to use it to calculate the temperature.
- the upper and lower thresholds of the above-mentioned radiant energy may be set as follows, for example. That is, the temperature T 0 is prepared known melt in advance by experiment facilities, radiant energy value of the scheduled measurement wavelength at temperature T 0 by using the spectroscopic camera ( ⁇ 1, ⁇ 2) (I ' ( ⁇ 1) T0, I' ( ⁇ 2) T0 ) is measured. For example, when the range of the molten metal temperature to be measured is 1200 to 1350 ° C., I'( ⁇ 1) 1200 and I'( ⁇ 2) 1200 at 1200 ° C. are measured, and these are measured as I ( ⁇ 1) and I ( ⁇ 1) in the actual measurement. Let it be the lower limit of I ( ⁇ 2). Similarly, I'( ⁇ 1) 1350 and I'( ⁇ 2) 1350 at 1350 ° C. are measured, and these are used as the upper limit values of I ( ⁇ 1) and I ( ⁇ 2) in the actual measurement.
- the lower limit values of I ( ⁇ 1) and I ( ⁇ 2) may be the values of I'( ⁇ 1) Tmin and I'( ⁇ 2) Tmin obtained in advance with T 0 as the minimum temperature T min in the planned measurement temperature range.
- T min may be set to a temperature within about 50 ° C. lower than the above minimum temperature.
- the radiant energy value becomes smaller as the temperature becomes lower, so that the values of I'( ⁇ 1) T0 and I'( ⁇ 2) T0 at a temperature lower than the above temperature are too small to function as a threshold value.
- the upper limit values of I ( ⁇ 1) and I ( ⁇ 2) may be the values of I'( ⁇ 1) Tmax and I'( ⁇ 2) Tmax obtained in advance with T 0 as the maximum temperature T max in the planned measurement temperature range. ..
- the reason for setting the upper limit is that since the value of radiant energy generated by sparks and flames is generally large, the influence of sparks and flames on the measured values becomes relatively large, and the accuracy of the hot metal temperature measurement value decreases. ..
- the temperature of the hot metal during the period in which the hot metal used as a raw material for blowing in the converter is charged into the converter is used as the charging hot metal temperature.
- the temperature measuring instrument that measures optically and the charged hot metal temperature measured by the temperature measuring instrument, the amount of oxygen supplied and the cold material, etc. for controlling the composition and temperature of the molten steel at the end of blowing to the target value, etc. It is equipped with a computer for calculating the input amount of the above and a control device for controlling blowing in the converter based on the amount of oxygen supplied to the converter and the amount of cold material charged to the converter calculated by the computer.
- the computer sequentially calculates the temperature of the molten metal during blowing using the charged hot metal temperature measured by the temperature measuring instrument, and the control device is based on the temperature of the molten metal during blowing calculated by the computer.
- the blowing in the converter may be controlled.
- the temperature measuring instrument a two-color thermometer, a radiation thermometer, a thermoviewer, or the like can be exemplified.
- the temperature measuring instrument is installed, for example, in a place where the injection flow when the hot metal flows into the converter from the charging pot can be observed. It is preferable to install the temperature measuring instrument at an angle that looks up at the injection flow because it is less susceptible to dust generation during hot metal charging.
- the temperature measuring instrument measures the temperature of the hot metal at a preset timing and period from the start to the end of charging the hot metal.
- the temperature of the hot metal measured by the temperature measuring instrument is transmitted to a computer installed in the operation room or the like, and the computer executes the blowing calculation such as static control calculation using the received hot metal temperature as the charged hot metal temperature.
- the hot metal 12 used as a raw material for blowing in the converter 11 is loaded from the charging pot 13 to the converter 11.
- the spectroscopic camera 2 that measures the two-color temperature information of the hot metal 12 during the charging period
- the first computer 3 that receives the two-color temperature information from the spectroscopic camera 2 and calculates the charged hot metal temperature
- the converter 11 It was measured by the exhaust gas flow meter 4 that measures the flow rate of the exhaust gas of the converter 11, the exhaust gas analyzer 5 that analyzes the composition of the exhaust gas of the converter 11, and the charge hot metal temperature and the exhaust gas flow meter 4 calculated by the first computer 3.
- a second computer 6 is provided, and a control device 7 for controlling blowing in the converter 11 based on the amount of oxygen supplied to the converter 11 calculated by the second computer 6 and the amount of cold material charged into the converter 11. ing.
- the control device 7 includes a gas flow rate control device 7a that controls the flow rate of a gas such as oxygen supplied to the converter 11, a sublance control device 7b that controls the measurement operation of the temperature and component concentration of the molten metal using the sublance, and the control device 7.
- the auxiliary material input control device 7c for controlling the operation of inputting the auxiliary material into the converter 11 is provided.
- the second computer 6 blows using the charge hot metal temperature calculated by the first computer 3, the flow rate of the exhaust gas measured by the exhaust gas flow meter 4, and the composition of the exhaust gas analyzed by the exhaust gas analyzer 5.
- the temperature of the molten metal in the molten metal may be sequentially calculated, and the control device 7 may control the blowing in the converter 11 based on the temperature of the molten metal in the molten metal calculated by the second computer 6.
- the spectroscopic camera 2 is a general term for cameras capable of capturing spectroscopic data in addition to a planar image of a measured temperature such as a so-called thermoviewer. Further, the spectroscopic data is data collected by dividing a large number of wavelengths contained in the synchrotron radiation for each wavelength. As a method of measuring the two-color temperature information by the spectroscopic camera 2, a large number of wavelength data may be collected by the spectroscopic camera 2 and data of any two wavelengths may be extracted from the obtained data by a computer or the like. If the camera has a band pass filter in the spectroscopic camera 2, any two wavelengths may be extracted by this band pass filter.
- the spectroscopic camera imaging is often performed by a CCD element, a plurality of CCD elements may be mounted and each CCD element may measure a different wavelength range.
- the spectroscopic camera 2 it is more preferable to adopt a type (line measurement) in which a linear region is a measurement point rather than a type (spot measurement) in which a point-shaped region is a measurement point. Since the exposed position always moves in the injection flow at the time of hot metal charging, accurate measurement may not be possible with the spot measurement type.
- the line measurement type the spectrum measurement of the injection flow is performed at a plurality of positions, and accurate measurement can be performed with high probability.
- a line measurement type spectroscopic camera it can be used as a representative value by averaging the measured values in the measurement area.
- the spectroscopic camera 2 is installed, for example, in front of the furnace on the converter charging side, in a place where the injection flow when the hot metal 12 flows into the converter 11 from the charging pot 13 can be observed. It is preferable to install the spectroscopic camera 2 at an angle that looks up at the injection flow because it is not easily affected by dust generation at the time of hot metal charging. If the spectroscopic camera 2 is installed above the injection flow at the time of hot metal charging, the amount of soot between the spectroscopic camera and the injection flow increases due to the increase in soot, and the measurement error becomes large. Normally, the operating floor on which the operation room is placed is below the injection flow position at the time of hot metal charging, so the spectroscopic camera 2 may be installed on the operating floor.
- the installation position of the spectroscopic camera 2 is below the injection flow at the time of hot metal charging, and the converter and charging are started from the position where the mouth of the converter furnace and the mouth of the charging pot are combined at the time of hot metal charging. It is more preferable to set the point moved horizontally by 5 to 15 ° from the line connecting the horizontal centers of the pot. Since the angles of the converter and the charging pot during the hot metal charging change with the progress of the hot metal charging, the field of view where the injection flow can be observed also changes. On the other hand, from the viewpoint of improving the measurement accuracy and the measurement accuracy and simplifying the measurement equipment, it is preferable that the measurement can be performed with the field of view of the spectroscopic camera 2 fixed during the hot metal injection.
- the injection flow moves up and down relatively large in the field of view of the spectroscopic camera 2 as the hot metal charging progresses. Move left and right.
- the injection flow does not move much within the field of view of the spectroscopic camera 2. No. However, if it is close to the converter, the spectroscopic camera 2 cannot withstand due to heat, and if it is far away, the view is obstructed by the converter and the charging pot, and the injection flow cannot be measured.
- the position where the spectroscopic camera 2 is installed is below the injection flow at the time of hot metal charging and is a point moved 5 to 15 ° in the horizontal direction from the line connecting the horizontal centers of the converter and the charging pot. good.
- the spectroscopic camera 2 is preferably separated from the converter by about 20 m or more. This is because if the distance from the converter is shorter than 20 m, the high-temperature melt scattered from the converter at the time of charging or blowing may come into contact with the spectroscopic camera 2 and damage the spectroscopic camera 2.
- the spectroscopic camera 2 collects two-color temperature information at a preset sampling rate (for example, every 1 second) from the start to the end of hot metal charging.
- the two-color temperature information collected by the spectroscopic camera 2 is transmitted to the first computer 3 installed in the operation room or the like, and the charge hot metal temperature is calculated by the first computer 3.
- Blow-in calculation such as static control calculation is performed using the calculated hot metal charge temperature.
- the first computer 3 for calculating the charge hot metal temperature and the second computer 6 for performing the blowing calculation may be the same computer or different computers.
- thermocouple from measuring the temperature of the hot metal filled in the charging pot using a thermocouple to measuring the temperature of the hot metal when flowing from the charging pot into the converter using a two-color thermometer. It is a figure which shows an example of the relationship between the elapsed time, the temperature of the hot metal measured by a two-color thermometer, and the temperature of the hot metal measured by a thermocouple (temperature difference). As shown in FIG. 2, although there is a correlation between the temperature difference and the elapsed time, the variation is large.
- the temperature of the hot metal measured in the charging pot is used as the charging hot metal temperature in the heat balance calculation.
- it can be seen that it becomes a factor that reduces the accuracy of heat balance calculation.
- FIG. 3 shows the temperature of the molten metal during blowing estimated from the operating conditions and the exhaust gas information in the invention example and the comparative example when 300 to 350 tons of hot metal is blown using a 350 ton converter. It is a figure which shows the relationship between the temperature (estimated temperature) and the temperature of the molten metal (actual temperature in the middle) measured by the sublance introduced during smelting.
- the invention example shows the intermediate estimated temperature when the temperature of the hot metal during charging is reflected in the heat balance calculation as the charging hot metal temperature
- the comparative example is the previous step (dephosphorization treatment in the converter).
- the estimated midway temperature calculated using the charge hot metal temperature estimated from the end point temperature and the estimated temperature drop is shown. As shown in FIG.
- Table 1 below shows the error of the actual molten steel temperature with respect to the target molten steel temperature at the end of blowing in the invention example and the comparative example when smelting 300 to 350 tons of hot metal using a 350 ton converter. .. Similar to the example shown in FIG. 3, the invention example is a case where the temperature of the hot metal measured during the hot metal charging is reflected in the heat balance calculation as the charging hot metal temperature, and the comparative example is the temperature at the end of the previous process. This is the case when the charged hot metal temperature estimated from the estimated temperature drop is used.
- the sublance temperature can be controlled in a narrow range, and as a result, the accuracy of the molten steel temperature at the time of blow-off is improved. It is improving. That is, it was confirmed that the molten steel temperature at the end of smelting can be accurately controlled by reflecting the temperature of the hot metal measured during the hot metal charging as the charged hot metal temperature in the heat balance calculation.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Radiation Pyrometers (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
転炉操業では、吹錬終了時(吹止め)における溶鋼の温度及び炭素濃度等の成分濃度を目標値に制御するために、スタティック制御とダイナミック制御とを組み合わせた吹錬制御が行われている。スタティック制御は、熱収支計算及び物質収支計算に基づいた数式モデルを用いて、溶鋼の温度及び成分濃度を目標値に制御するために必要な供給酸素量及び冷材又は昇熱材(以下、冷材等と表記)の投入量を吹錬開始前に決定する。そして、決定された供給酸素量及び冷材等の投入量に基づいて吹錬を開始、進行させ、一定時間継続した後(例えば、スタティック制御で計算された供給酸素量の80~90%を吹精した時点等)、サブランスを用いて溶湯の温度及び成分濃度を測定する。ダイナミック制御では、サブランスを用いて測定された溶湯の温度及び成分濃度並びに熱収支及び物質収支と反応モデルとに基づいた数式モデルを用いて、スタティック制御で決定した供給酸素量や冷材等の投入量を修正し、吹止めまでの供給酸素量及び冷材等の投入量を最終的に決定する。
本発明の第1の実施形態である転炉吹錬制御システムは、転炉での吹錬の原料として用いる溶銑が転炉へ装入されている期間中における溶銑の温度を装入溶銑温度として光学的に測定する温度計測器と、温度計測器によって測定された装入溶銑温度を用いて、吹錬終了時の溶鋼の成分及び温度を目標値に制御するための供給酸素量及び冷材等の投入量を算出する計算機と、計算機によって算出された転炉への供給酸素量及び冷材等の投入量に基づいて転炉での吹錬を制御する制御装置と、を備えている。
2 分光カメラ
3 第一計算機
4 排ガス流量計
5 排ガス分析計
6 第二計算機
7 制御装置
7a ガス流量制御装置
7b サブランス制御装置
7c 副原料投入制御装置
11 転炉
12 溶銑
13 装入鍋
Claims (11)
- 転炉での吹錬終了時の溶鋼の温度及び成分濃度を目標値に制御するための供給酸素量及び冷材又は昇熱材の投入量を熱収支計算及び物質収支計算により算出し、算出された供給酸素量及び冷材又は昇熱材の投入量に基づいて転炉での吹錬を制御する転炉吹錬制御方法であって、
前記熱収支計算で用いる装入溶銑温度として、前記熱収支計算の対象である吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中に測定された溶銑の温度を用いる、転炉吹錬制御方法。 - 転炉での吹錬開始時及び吹錬中に得られる転炉の操業条件及び計測値に基づいて吹錬中に熱収支計算及び物質収支計算を逐次行うことにより吹錬進行時点での溶湯の温度及び成分濃度を逐次推定し、推定された溶湯の温度及び成分濃度に基づいて転炉での吹錬を制御する転炉吹錬制御方法であって、
前記熱収支計算で用いる装入溶銑温度として、前記熱収支計算の対象である吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中に測定された溶銑の温度を用いる、転炉吹錬制御方法。 - 前記熱収支計算で用いる装入溶銑温度として、前記熱収支計算の対象である吹錬の原料として用いる溶銑が溶銑保持容器から前記転炉に流入する際に非接触の光学的方法を用いて測定された溶銑の温度を用いる、請求項1又は2に記載の転炉吹錬制御方法。
- 前記非接触の光学的方法が、溶銑から放射される発光スペクトルを測定し、測定された発光スペクトルより選ばれる異なる2波長の放射エネルギー比から溶銑の温度を算出する方法である、請求項3に記載の転炉吹錬制御方法。
- 前記異なる2波長をλ1及びλ2(>λ1)としたとき、λ1及びλ2が共に400nmから1000nmの範囲内にあり、λ1とλ2の差の絶対値が50nm以上600nm以下である、請求項4に記載の転炉吹錬制御方法。
- 前記異なる2波長をλ1及びλ2(>λ1)としたとき、λ1及びλ2が共に400nmから1000nmの範囲内にあり、λ1とλ2の差の絶対値が200nm以上600nm以下である、請求項4に記載の転炉吹錬制御方法。
- 予め定めた前記異なる2波長の発光スペクトルの放射率の比によって溶銑の温度の測定値を補正する、請求項4~6のうち、いずれか1項に記載の転炉吹錬制御方法。
- 転炉での吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中における溶銑の温度を装入溶銑温度として光学的に測定する温度計測器と、
前記温度計測器によって測定された装入溶銑温度を用いて、転炉での吹錬終了時の溶鋼の温度及び成分濃度を目標値に制御するための転炉への供給酸素量及び冷材又は昇熱材の投入量を熱収支計算及び物質収支計算により算出する計算機と、
前記計算機によって算出された転炉への供給酸素量及び冷材又は昇熱材の投入量に基づいて転炉での吹錬を制御する制御装置と、
を備える、転炉吹錬制御システム。 - 転炉での吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中における溶銑の2色温度情報を測定する分光カメラと、
前記分光カメラによって測定された2色温度情報を用いて前記溶銑の温度を装入溶銑温度として算出する第一計算機と、
前記第一計算機によって算出された装入溶銑温度を用いて、転炉での吹錬終了時の溶鋼の温度及び成分濃度を目標値に制御するための転炉への供給酸素量及び冷材又は昇熱材の投入量を熱収支計算及び物質収支計算により算出する第二計算機と、
前記第二計算機によって算出された転炉への供給酸素量及び冷材又は昇熱材の投入量に基づいて転炉での吹錬を制御する制御装置と、
を備える、転炉吹錬制御システム。 - 転炉での吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中における溶銑の温度を装入溶銑温度として光学的に測定する温度計測器と、
前記温度計測器によって測定された装入溶銑温度を用いて吹錬中の溶鋼の温度を逐次算出する計算機と、
前記計算機によって算出された吹錬中の溶鋼の温度に基づいて転炉での吹錬を制御する制御装置と、
を備える、転炉吹錬制御システム。 - 転炉での吹錬の原料として用いる溶銑が前記転炉へ装入されている期間中における溶銑の2色温度情報を測定する分光カメラと、
前記分光カメラによって測定された2色温度情報を用いて前記溶銑の温度を装入溶銑温度として算出する第一計算機と、
前記第一計算機によって算出された装入溶銑温度を用いて吹錬中の溶鋼の温度を逐次算出する第二計算機と、
前記第二計算機によって算出された吹錬中の溶鋼の温度に基づいて転炉での吹錬を制御する制御装置と、
を備える、転炉吹錬制御システム。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21832549.6A EP4177360A4 (en) | 2020-07-01 | 2021-04-30 | CONVERTER BLOW CONTROL METHOD AND SYSTEM |
US18/011,747 US20230243005A1 (en) | 2020-07-01 | 2021-04-30 | Converter blowing control method and converter blowing control system |
KR1020227044493A KR20230013096A (ko) | 2020-07-01 | 2021-04-30 | 전로 취련 제어 방법 및 전로 취련 제어 시스템 |
JP2021557858A JP7156551B2 (ja) | 2020-07-01 | 2021-04-30 | 転炉吹錬制御方法及び転炉吹錬制御システム |
BR112022026402A BR112022026402A2 (pt) | 2020-07-01 | 2021-04-30 | Método de controle de sopro de conversor e sistema de controle de sopro de conversor |
CN202180045527.4A CN115715331A (zh) | 2020-07-01 | 2021-04-30 | 转炉吹炼控制方法及转炉吹炼控制系统 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020113970 | 2020-07-01 | ||
JP2020-113970 | 2020-07-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022004119A1 true WO2022004119A1 (ja) | 2022-01-06 |
Family
ID=79315181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/017239 WO2022004119A1 (ja) | 2020-07-01 | 2021-04-30 | 転炉吹錬制御方法及び転炉吹錬制御システム |
Country Status (8)
Country | Link |
---|---|
US (1) | US20230243005A1 (ja) |
EP (1) | EP4177360A4 (ja) |
JP (1) | JP7156551B2 (ja) |
KR (1) | KR20230013096A (ja) |
CN (1) | CN115715331A (ja) |
BR (1) | BR112022026402A2 (ja) |
TW (1) | TWI789807B (ja) |
WO (1) | WO2022004119A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01229943A (ja) * | 1987-11-09 | 1989-09-13 | Nippon Steel Corp | 溶鉄成分の検出方法およびそれに基づく精錬方法 |
JPH0310012A (ja) * | 1989-06-07 | 1991-01-17 | Nippon Steel Corp | 転炉製鋼法 |
JPH07173516A (ja) * | 1993-12-20 | 1995-07-11 | Nkk Corp | 転炉の操業方法 |
JP2001011521A (ja) * | 1999-06-25 | 2001-01-16 | Sumitomo Metal Ind Ltd | 転炉吹錬時の溶鋼温度および炭素濃度の推定法、および転炉吹錬法 |
JP2012087345A (ja) | 2010-10-18 | 2012-05-10 | Sumitomo Metal Ind Ltd | 転炉における吹錬制御方法 |
JP2012117090A (ja) | 2010-11-29 | 2012-06-21 | Sumitomo Metal Ind Ltd | 転炉吹錬方法及び転炉吹錬システム |
JP2019073799A (ja) * | 2017-10-16 | 2019-05-16 | Jfeスチール株式会社 | 溶湯温度補正装置、溶湯温度補正方法、及び溶湯の製造方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3920447A (en) * | 1972-02-28 | 1975-11-18 | Pennsylvania Engineering Corp | Steel production method |
CN103451353A (zh) * | 2013-08-30 | 2013-12-18 | 武汉钢铁(集团)公司 | 基于模拟副枪静态检测的启动转炉动态控制模型的方法 |
CN105925750A (zh) * | 2016-05-13 | 2016-09-07 | 南阳理工学院 | 一种基于神经网络的炼钢终点预测方法 |
CN106979832B (zh) * | 2017-03-22 | 2023-08-15 | 河南北方红阳机电有限公司 | 一种光纤分光测温系统及其测温方法 |
CN110809629B (zh) * | 2017-06-30 | 2022-04-05 | 杰富意钢铁株式会社 | 转炉操作的监视方法及转炉的操作方法 |
CN110551867A (zh) * | 2018-06-01 | 2019-12-10 | 上海梅山钢铁股份有限公司 | 一种基于炉渣成分预测的转炉冶炼控制方法 |
CN109517937A (zh) * | 2019-01-10 | 2019-03-26 | 山东莱钢永锋钢铁有限公司 | 一种转炉冶炼热平衡方法 |
-
2021
- 2021-04-30 KR KR1020227044493A patent/KR20230013096A/ko not_active Application Discontinuation
- 2021-04-30 WO PCT/JP2021/017239 patent/WO2022004119A1/ja active Application Filing
- 2021-04-30 BR BR112022026402A patent/BR112022026402A2/pt unknown
- 2021-04-30 US US18/011,747 patent/US20230243005A1/en active Pending
- 2021-04-30 EP EP21832549.6A patent/EP4177360A4/en active Pending
- 2021-04-30 JP JP2021557858A patent/JP7156551B2/ja active Active
- 2021-04-30 CN CN202180045527.4A patent/CN115715331A/zh active Pending
- 2021-06-30 TW TW110124088A patent/TWI789807B/zh active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01229943A (ja) * | 1987-11-09 | 1989-09-13 | Nippon Steel Corp | 溶鉄成分の検出方法およびそれに基づく精錬方法 |
JPH0310012A (ja) * | 1989-06-07 | 1991-01-17 | Nippon Steel Corp | 転炉製鋼法 |
JPH07173516A (ja) * | 1993-12-20 | 1995-07-11 | Nkk Corp | 転炉の操業方法 |
JP2001011521A (ja) * | 1999-06-25 | 2001-01-16 | Sumitomo Metal Ind Ltd | 転炉吹錬時の溶鋼温度および炭素濃度の推定法、および転炉吹錬法 |
JP2012087345A (ja) | 2010-10-18 | 2012-05-10 | Sumitomo Metal Ind Ltd | 転炉における吹錬制御方法 |
JP2012117090A (ja) | 2010-11-29 | 2012-06-21 | Sumitomo Metal Ind Ltd | 転炉吹錬方法及び転炉吹錬システム |
JP2019073799A (ja) * | 2017-10-16 | 2019-05-16 | Jfeスチール株式会社 | 溶湯温度補正装置、溶湯温度補正方法、及び溶湯の製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP4177360A4 |
Also Published As
Publication number | Publication date |
---|---|
BR112022026402A2 (pt) | 2023-01-17 |
EP4177360A4 (en) | 2024-01-17 |
JPWO2022004119A1 (ja) | 2022-01-06 |
TW202206608A (zh) | 2022-02-16 |
KR20230013096A (ko) | 2023-01-26 |
CN115715331A (zh) | 2023-02-24 |
US20230243005A1 (en) | 2023-08-03 |
TWI789807B (zh) | 2023-01-11 |
EP4177360A1 (en) | 2023-05-10 |
JP7156551B2 (ja) | 2022-10-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7088439B1 (ja) | 転炉の操業方法及び転炉の吹錬制御システム | |
KR20170094560A (ko) | 제강 공정들의 예측, 제어 및/또는 조절 방법 및 그 장치 | |
CA2235499C (en) | Method and apparatus to determine and control the carbon content of steel in a bof vessel | |
JPH11326061A (ja) | 炉内溶湯の温度測定方法及び装置 | |
WO2022004119A1 (ja) | 転炉吹錬制御方法及び転炉吹錬制御システム | |
JP7156550B2 (ja) | 転炉吹錬制御方法及び転炉吹錬制御システム | |
RU2813298C1 (ru) | Способ управления продувкой конвертера и система управления продувкой конвертера | |
CN114838830A (zh) | 一种授铁工艺段温度检测方法、装置及系统 | |
RU2811549C1 (ru) | Способ управления продувкой конвертера и система управления продувкой конвертера | |
TWI450969B (zh) | 高爐鐵水溫度之估測方法 | |
KR100994047B1 (ko) | 노내 침수시 노열 보상방법 | |
TW201734214A (zh) | 熔融生鐵預備處理方法及熔融生鐵預備處理控制裝置 | |
KR100383277B1 (ko) | 고로 내의 가스류 변동측정방법 | |
JP2006177873A (ja) | 高炉出銑滓の温度及び溶銑・溶融スラグ混合比率測定方法 | |
Krasnyanskii et al. | Improvement of the thermal operating conditions of steel-teeming ladles | |
JP2022029570A (ja) | 減圧下における溶鋼温度の測定方法 | |
JPS6139374B2 (ja) | ||
JPH0219412A (ja) | 転炉吹錬方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2021557858 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21832549 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202217072675 Country of ref document: IN |
|
ENP | Entry into the national phase |
Ref document number: 20227044493 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022134319 Country of ref document: RU |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112022026402 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112022026402 Country of ref document: BR Kind code of ref document: A2 Effective date: 20221222 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2021832549 Country of ref document: EP Effective date: 20230201 |