WO2021200225A1 - ガス吹き込み装置 - Google Patents

ガス吹き込み装置 Download PDF

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Publication number
WO2021200225A1
WO2021200225A1 PCT/JP2021/011103 JP2021011103W WO2021200225A1 WO 2021200225 A1 WO2021200225 A1 WO 2021200225A1 JP 2021011103 W JP2021011103 W JP 2021011103W WO 2021200225 A1 WO2021200225 A1 WO 2021200225A1
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WO
WIPO (PCT)
Prior art keywords
gas
blowing
plug
cleaning
flow path
Prior art date
Application number
PCT/JP2021/011103
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋佑 片岡
雄司 森井
孝文 今枝
Original Assignee
東京窯業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東京窯業株式会社 filed Critical 東京窯業株式会社
Priority to EP21780918.5A priority Critical patent/EP4129527A4/de
Publication of WO2021200225A1 publication Critical patent/WO2021200225A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • 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
    • C21C5/34—Blowing through the bath
    • 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
    • C21C7/072—Treatment with gases

Definitions

  • the present invention relates to a gas blowing device.
  • molten metal for example, molten steel
  • a storage container for example, a ladle
  • the molten steel to be stored is discharged to a tundish
  • hot water is poured from the tundish into a mold.
  • the ladle is transported to a predetermined position (original position), and the molten steel is poured again.
  • the stored and stored molten steel is processed, transported, and discharged. In a continuous casting machine, these steps are repeated.
  • the ladle is provided with a gas blowing plug (hereinafter, also referred to as a blowing plug) that blows gas (stirring gas) into the stored or stored molten steel.
  • a gas blowing plug (hereinafter, also referred to as a blowing plug) that blows gas (stirring gas) into the stored or stored molten steel.
  • the blowing plug is provided at the bottom of the tank-shaped ladle and blows a stirring gas such as argon or nitrogen into the molten steel.
  • a stirring gas such as argon or nitrogen
  • the blow plug may be, for example, a porous plug having a porous standard refractory with continuous pores, or a slit plug in which a slit (slit-shaped through hole) is formed in a non-porous (dense) standard refractory. I can give it.
  • the blowing plug blows a stirring gas that has passed through the continuous pores of the porous plug and the slit-shaped through holes of the slit plug into the molten steel.
  • the molten steel may infiltrate into the through holes (or pores) of the blowing plug (also called insertion). ..
  • the blowing plug also called insertion
  • the inserted molten steel solidifies in the through hole, and it becomes difficult for the stirring gas to pass through the through hole. That is, the amount of the agitated gas blown out is reduced, and the molten steel is not sufficiently agitated and processed.
  • a process cleaning of the blow plug
  • the ladle after cleaning the blow plug is reused.
  • the cleaning of the blowing plug is performed by blowing oxygen gas from the inner peripheral surface side of the ladle onto the inner surface of the blowing plug while blowing out the cleaning gas from the pores of the blowing plug.
  • the cleaning gas is a non-reactive gas such as Ar gas or N 2 gas.
  • This cleaning of the blow plug is also referred to as oxygen cleaning.
  • the ladle is transported to a predetermined position for oxygen cleaning during oxygen cleaning, and a blowing plug is connected to a cleaning gas supply source that supplies cleaning gas, so that cleaning gas can be blown out from the blowing plug.
  • Oxygen cleaning is performed by blowing oxygen gas from the blowing plug until the cleaning gas can be blown out at a predetermined flow rate. In other words, when the flow rate of the cleaning gas blown out from the blowing plug reaches a predetermined flow rate, the oxygen cleaning of the blowing plug is completed.
  • the ladle may be provided with multiple blow plugs.
  • a supply path for cleaning gas to be blown into the molten steel is provided for each blowing plug.
  • oxygen cleaning is performed for each blowing plug. Specifically, oxygen gas is blown while supplying cleaning gas to the first blowing plug (first blowing plug) to perform oxygen cleaning of the first blowing plug.
  • first blowing plug the connection between the first blowing plug and the cleaning gas supply source is disconnected, and the next blowing plug (second blowing plug) and the cleaning gas supply source are connected. Then, oxygen cleaning is performed by blowing oxygen gas while supplying cleaning gas to the second blowing plug.
  • blowing plug and the cleaning gas supply source are connected / disconnected each time the blowing plug that blows oxygen gas changes.
  • Cleaning a plurality of blow-in plugs requires extra time and effort for connecting and disconnecting the blow-in plugs and the cleaning gas supply source.
  • connection and disconnection is done manually by the operator.
  • the temperature around the ladle is high due to the heat of the molten metal remaining in the ladle itself and the inside of the ladle (particularly, the radiant heat from the ladle side). Therefore, when the number of times of connection and disconnection increases, there is a problem that the number and time of exposure of the worker to high heat increases. That is, there is a problem that the safety of the operator is lowered.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas blowing device provided with a storage container having a plurality of blowing plugs and capable of smoothly and safely cleaning the blowing plugs. ..
  • the gas blowing device of the present invention for solving the above problems has a first blowing plug for blowing gas into the molten metal provided at the bottom of a storage container for storing the molten metal, and the first blowing device for blowing gas into the bottom of the storage container. It has a second blowing plug for blowing gas into the molten metal and a gas receiving port for receiving the gas supply, which are provided at positions separated from the plug, and the first blowing plug or the first blowing plug which receives the gas supply. It is a gas blowing device having a gas supply circuit for supplying gas to the second blowing plug, and blowing out a predetermined gas from each of the blowing plugs at the time of cleaning each of the blowing plugs.
  • a switching device provided to switch the gas flow between the first gas flow path and the second gas flow path, and the gas provided in the first gas flow path and flowing through the first gas flow path.
  • a first gas flow meter for measuring the flow rate of the gas, a second gas flow meter provided in the second gas flow path and measuring the flow rate of the gas flowing through the second gas flow path, and the first gas flow meter.
  • the switching device When the second gas flowmeter is connected and the flow rate of the gas flowing through the first gas flow path or the second gas flow path becomes equal to or higher than a predetermined flow rate, the switching device is operated to operate the switching device of the gas. It is characterized by having a control device that switches the flow and operates a notification device to notify the change to the outside.
  • the flow of gas from the gas receiving port can be switched by the switching device and flowed to the first blowing plug (first gas flow path) or the second blowing plug (second gas flow path).
  • first blowing plug first gas flow path
  • second blowing plug second gas flow path
  • the gas blowing device of the present invention preferably operates at the time of cleaning the first blowing plug and the second blowing plug. According to this configuration, it is possible to reduce the number of connections with the gas source to each of the blow plugs for cleaning the blow plugs. That is, the operator can more safely clean the blow plug.
  • FIG. 1 It is the schematic which shows the structure of the ladle of Embodiment 1.
  • FIG. It is the schematic which shows the structure of the gas supply circuit of the ladle of Embodiment 1.
  • FIG. It is the schematic which shows the structure of the continuous casting machine using the ladle of Embodiment 1.
  • FIG. 1 is the schematic which shows the structure of the ladle of Embodiment 1.
  • the embodiment is an example in which the gas blowing device of the present invention is applied to a ladle for processing molten steel.
  • Molten steel corresponds to molten metal.
  • each of the following forms is an example of a specific form for carrying out the present invention, and the present invention is not limited to each of the following forms. Further, the configuration of each form may be appropriately combined.
  • the ladle 1 of the present embodiment includes a ladle body 2, a blowing plug 3, a cleaning gas supply circuit 4, and a cleaning gas supply device 5.
  • FIG. 1 schematically shows the configuration of the ladle 1.
  • FIG. 2 schematically shows the configuration of the cleaning gas supply circuit 4.
  • FIG. 3 schematically shows the configuration of the continuous casting machine 6 using the ladle 1.
  • the ladle body 2 corresponds to a storage container and is a tank-shaped container for storing molten steel (corresponding to molten metal).
  • the ladle body 2 is provided with a blow plug 3 at the bottom of the container.
  • the ladle body 2 is provided with a nozzle 21 at the bottom of the container for discharging the stored molten steel.
  • the nozzle 21 has a molten steel outflow hole for discharging the stored molten steel.
  • the structure of the ladle body 2 is not limited, and a conventional one can be used.
  • the ladle body 2 of this embodiment has a tank-shaped iron skin and a refractory material arranged on the inner peripheral side of the iron skin.
  • the blow plug 3 has a first blow plug 31 and a second blow plug 32.
  • the first blowing plug 31 is a member provided at the bottom of the ladle body 2 for blowing gas (cleaning gas and stirring gas) into molten steel (molten metal).
  • the second blowing plug 32 is a member provided at the bottom of the ladle body 2 at a position spaced apart from the first blowing plug 31 to blow gas into molten steel (molten metal).
  • the blowing plug 3 (first blowing plug 31 and second blowing plug 32) is provided by being embedded in a refractory material on the inner peripheral side of the ladle main body 2.
  • the configuration of the blow plug 3 (first blow plug 31 and second blow plug 32) is not limited, and conventional blow plugs 3 can be used. Examples of the blow plug 3 include a porous plug and a slit plug.
  • the cleaning gas supply circuit 4 has a gas receiving port 41 for receiving the cleaning gas from the cleaning gas supply device 5, and receives the cleaning gas from the gas receiving port 41 to receive the cleaning gas from the first blowing plug 31 and the second blowing plug 32. Supply cleaning gas to.
  • the cleaning gas supply circuit 4 has a pipeline that forms a flow path for the cleaning gas.
  • the cleaning gas supply circuit 4 includes a valve 42, a first gas flow path 43, a first gas flow meter 44, a second gas flow path 45, a second gas flow meter 46, a control device 47, and a notification device 48. Further, the cleaning gas supply circuit 4 is provided with a pressure adjusting valve V and a gas pressure gauge P. The cleaning gas supply circuit 4 has a valve 42 in a portion downstream of the gas receiving port 41. The gas receiving port 41 forms a connecting portion between the ladle 1 of the present embodiment and the cleaning gas supply device 5.
  • the valve 42 corresponds to the gas switching means, and switches the gas flow so that the gas from the gas receiving port 41 flows into the first gas flow path 43 or the second gas flow path 45.
  • the valve 42 is not limited as long as it is a member or device capable of switching the gas flow paths 43 and 45 so that the cleaning gas flows through either of the gas flow paths 43 and 45.
  • a solenoid valve is used for the valve 42 so that the cleaning gas flows only in one of the first gas flow path 43 and the second gas flow path 45.
  • the first gas flow path 43 is connected to the first blowing plug 31 and is formed so that the gas from the gas receiving port 41 flows into the first blowing plug 31.
  • the first gas flow meter 43 is provided with a first gas flow meter 44 in the flow path.
  • the second gas flow path 45 is connected to the second blowing plug 32 and is formed so that the gas from the gas receiving port 41 flows into the second blowing plug 32.
  • the second gas flow path 45 is provided with a second gas flow meter 46 in the flow path.
  • the first gas flow meter 44 and the second gas flow meter 46 are not limited as long as they can measure the flow rate of the gas flowing through the gas flow paths 43 and 45, and in this embodiment, the gas flow rate used for the conventional ladle. I am using a meter.
  • the control device 47 is connected to a valve 42, a first gas flow meter 44, a second gas flow meter 46, and a notification device 48.
  • the connection between the control device 47 and each of the valve 42, the first gas flow meter 44, the second gas flow meter 46, and the notification device 48 is not limited as long as it can transmit and receive necessary signals (information). It is possible to improve connection methods such as wired connection for transmitting and receiving electric signals, mechanical connection (physical connection) using actuators, and wireless connection using electromagnetic waves.
  • the control device 47 inputs the measurement results of the gas flow meters 44 and 46, and the flow rate of the gas flowing through the gas flow rate selected by the valve 42 among the gas flow rates 43 and 45 and the preset gas flow rate. Compare with (predetermined flow rate). Then, when the flow rate of the gas becomes equal to or higher than a predetermined flow rate, the end of oxygen cleaning is determined. When the control device 47 determines that the oxygen cleaning is completed, the control device 47 operates the valve 42 to switch the flow of the cleaning gas.
  • the notification device 48 When the control device 47 determines that the oxygen cleaning is completed, the notification device 48 is operated to notify the outside (particularly, the oxygen cleaning worker) of the switching of the gas flow.
  • the control device 47 operates the notification device 48, that is, notifies the outside for a predetermined time.
  • the notification device 48 stops operating after a predetermined time has elapsed.
  • the control device 47 of this embodiment controls the operation and stop of the notification device 48 (on / off control).
  • the notification device 48 may have a timer.
  • the timer stops the operation of the notification device 48 after a predetermined time elapses (control only off).
  • the control device 47 can control only the operation of the notification device 48 (control only on).
  • the notification device 48 is not limited as long as it is a device that can notify the outside (particularly, the operator around the ladle 1) of the switching of the gas flow.
  • a buzzer 481 and a light 482 are used.
  • the buzzer 481 indicates a device that audibly notifies the outside by using an audible sound (acoustic), and includes a device such as a speaker or a bell.
  • the light 482 indicates a means for visually notifying the outside using visible light, and includes a device such as a rotating light or a flashlight that emits blinking light, or a device such as a display that displays information such as characters and symbols. include.
  • the notification device 48 of the present embodiment sounds the buzzer 481 for a predetermined time and turns on the light 482 to notify the outside.
  • the pressure adjusting valve V is provided in the first gas flow path 43 and the second gas flow path 45, and adjusts the pressure of the cleaning gas flowing through the respective flow paths 43 and 45.
  • the gas pressure gauge P is provided in the first gas flow path 43 and the second gas flow path 45, and measures the pressure of the cleaning gas flowing through the respective flow paths 43 and 45.
  • the pressure adjusting valve V adjusts the pressure of the cleaning gas based on the measurement result of the gas pressure gauge P.
  • the measurement result of the gas pressure gauge P may be transmitted to the control device 47, and the transmitted gas pressure measurement result may be used for the gas flow switching determination.
  • the cleaning gas supply device 5 is connected to the gas receiving port 41 and supplies gas (cleaning gas) to the gas receiving port 41.
  • the configuration of the cleaning gas supply device 5 is not limited as long as it can supply cleaning gas to the gas receiving port 41.
  • the cleaning gas supply device 5 is, for example, a control valve that connects a gas cylinder for storing cleaning gas, a gas cylinder and a gas receiving port 41, and is provided in a pipeline or a pipeline through which the cleaning gas flows, and controls a gas flow rate. Can be mentioned as a device having.
  • the cleaning gas supplied by the cleaning gas supply device 5 is not limited, and is a gas used in conventional oxygen cleaning. Examples of the cleaning gas include non-reactive gases such as Ar gas and N 2 gas.
  • the ladle 1 of this embodiment is used for the continuous casting machine 6.
  • the continuous casting machine 6 has a ladle 1, a tundish 61, and a mold 62.
  • the continuous casting machine 6 pours molten steel from the outlet (not shown) into the ladle 1 (ladle body 2).
  • the ladle 1 (ladle body 2) stores the molten steel that has been poured.
  • the blowing plug 3 is connected to a stirring gas supply device (not shown) that supplies the stirring gas.
  • the blowing plug 3 and the stirring gas supply device are connected via a pipe (pipeline, path) different from that of the cleaning gas supply circuit 4.
  • the stirring gas from the stirring gas supply device is blown out from the blowing plug 3.
  • treatments such as stirring the molten steel, adjusting the temperature, and promoting the reaction for removing non-metal components are performed.
  • the ladle 1 is conveyed to a predetermined position (for example, the position shown in FIG. 3) above the tundish 61. Then, the molten steel is discharged to the tundish 61 through the nozzle 21. The molten steel discharged into the tundish 61 is poured into a mold 62 and continuously cast (formed). The ladle 1 is conveyed to a predetermined position (the original position where the molten steel can be poured from the outlet), and the molten steel is poured again. Then, in the continuous casting machine 6, the steps of storing molten steel, processing molten steel, transporting, and discharging are repeatedly performed.
  • the molten steel When the molten steel is processed, the molten steel infiltrates and solidifies into the through holes (or pores) of the blow plug 3, making it difficult for the stirring gas to pass through the through holes.
  • the blow plug 3 In response to this problem, in the ladle 1, the blow plug 3 is oxygen-cleaned every time the molten steel is discharged.
  • the molten steel is discharged from the ladle body 2 of the ladle 1 so that the ladle 1 (the ladle body 2) does not store the molten steel.
  • the ladle 1 is transported to a predetermined position (working position where oxygen cleaning is performed).
  • the ladle body 2 of the ladle 1 is tilted sideways so that the bottom of the ladle body 2 faces an operator (an operator who performs oxygen cleaning).
  • the blowing plug 3 and the cleaning gas supply circuit 4 are connected, and the gas receiving port 41 of the cleaning gas supply circuit 4 and the cleaning gas supply device 5 are connected.
  • the cleaning gas supply device 5 is operated to supply the cleaning gas to the gas receiving port 41.
  • the control device 47 of the cleaning gas supply circuit 4 sets the valve 42 so that the cleaning gas from the gas receiving port 41 flows into the first gas flow path 43.
  • the cleaning gas of the cleaning gas supply device 5 is supplied to the gas receiving port 41.
  • the cleaning gas flows to the first blowing plug 31 through the gas receiving port 41, the valve 42, and the first gas flow path 43, and is blown out from the first blowing plug 31.
  • the operator blows oxygen gas to the first blowing plug 31 from which the cleaning gas is blown out.
  • the oxygen gas is first blown by an operator who is located away from the opening of the sideways pan main body 2 using a long pipe-shaped cleaning lance 63.
  • Oxygen gas is blown onto the plug 31.
  • the molten steel that has penetrated into the through hole of the first blowing plug 31 reacts with the oxygen gas to generate heat and melt.
  • the cleaning gas from the gas receiving port 41 is supplied to the first blowing plug 31, and the molten steel melted along with the flow of the cleaning gas is blown out from the first blowing plug 31 to remove the molten steel.
  • the gas flow rate of the cleaning gas flowing through the first gas flow path 43 increases.
  • the increase in gas flow rate can be measured by the first gas flow meter 44.
  • the measurement result of the first gas flow meter 44 is input to the control device 47.
  • the control device 47 compares the flow rate of the cleaning gas flowing through the first gas flow path 43 with a preset flow rate (predetermined flow rate). Then, when the flow rate of the cleaning gas in the first gas flow path 43 becomes equal to or higher than a predetermined flow rate, the end of oxygen cleaning of the first blowing plug 31 is determined.
  • control device 47 determines that the oxygen cleaning of the first blowing plug 31 has been completed, the control device 47 operates the valve 42 to switch the flow of the cleaning gas. Then, the cleaning gas flows to the second blowing plug 32 through the gas receiving port 41, the valve 42, and the second gas flow path 45, and is blown out from the second blowing plug 32.
  • the buzzer 481 and the light 482 are operated for a predetermined time.
  • the operator confirms the end time of the oxygen cleaning of the first blowing plug 31, and performs the oxygen cleaning of the second blowing plug 32 in the same manner as in the case of the first blowing plug 31.
  • the ladle 1 of the present embodiment reduces the number of connection points between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow-in plug 3) to one, thereby reducing the connection points between the cleaning gas supply device 5 and the cleaning gas supply circuit 4. It is possible to reduce the labor (working cost) required for connection with 4 (blow-in plug 3).
  • connection between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 is such that the ladle 1 (ladle body 2) is in a molten state where the molten steel can be cleaned by oxygen cleaning immediately after the molten steel is discharged. ).
  • the ladle 1 (ladle body 2) is sufficiently hot, and the operator is exposed to the heat (particularly radiant heat) from the ladle 1 (ladle body 2).
  • the time when the operator is exposed to high heat can be shortened by reducing the number of connection points to one. That is, the ladle 1 of this embodiment improves the safety of the operator in oxygen cleaning.
  • the ladle 1 of the present embodiment determines the end time of oxygen cleaning by measuring the gas flow rate of the cleaning gas flowing through the first gas flow path 43 with the first gas flow meter 44. Therefore, the oxygen cleaning of the second blowing plug 32 can be performed immediately after the oxygen cleaning of the first blowing plug 31 is completed. That is, the oxygen cleaning of the first blowing plug 31 to the second blowing plug 32 can be smoothly switched. Oxygen cleaning of the first blowing plug 31 is not performed longer than necessary, and the working time required for oxygen cleaning can be shortened. Further, it is possible to prevent the refractory material disposed on the inner peripheral surface of the ladle body 2 from being excessively heated and damaged due to excessive oxygen cleaning. As described above, in the ladle 1 of this embodiment, the operator can smoothly and safely perform oxygen cleaning of the blowing plug 3.
  • the ladle 1 of this embodiment notifies the operator of the end time of oxygen cleaning of the first blowing plug 31 by operating the buzzer 481 and the light 482 for a predetermined time. According to this configuration, the operator can surely recognize the end time of oxygen cleaning. As a result, the above effect can be surely exhibited.
  • This embodiment is the same ladle 1 as in the first embodiment except that it further has a third blowing plug (and a third gas flow path).
  • the third blowing plug and the third gas flow path are the first blowing plug 31 (first gas flow path 43) and the second blowing plug 32 (second gas flow path 45) of the first embodiment.
  • the third gas flow path is connected to the third blowing plug and is formed so that the cleaning gas from the gas receiving port 41 flows into the third blowing plug.
  • the third gas flow path is provided with a third gas flow meter in the flow path.
  • the valve 42 switches the gas flow so that the cleaning gas from the gas receiving port 41 flows into any of the first gas flow path 43, the second gas flow path 45, and the third gas flow path.
  • the control device 47 inputs the measurement results of each gas flow meter, and the flow rate of the gas flowing through the gas flow path selected by the valve 42 in each gas flow rate and the flow rate of the preset gas (predetermined flow rate). To compare. Then, when the gas flow rate becomes equal to or higher than a predetermined flow rate, the valve 42 is operated to switch the gas flow. At the same time, the control device 47 operates the buzzer 481 and the light 482 for a predetermined time to switch the flow of the cleaning gas.
  • the ladle 1 of the present embodiment is the same as the ladle 1 of the first embodiment except that the number of the blowing plugs 3 is increased.
  • the ladle 1 of the present embodiment performs oxygen cleaning of the first blowing plug 31 and the second blowing plug 32 in the same manner as in the first embodiment.
  • the valve 42 is operated to switch the flow of the cleaning gas. Specifically, the valve 42 is switched so that the cleaning gas from the gas receiving port 41 flows from the second gas flow path 45 to the third gas flow path.
  • the buzzer 481 and the light 482 are operated for a predetermined time.
  • the operator confirms the end time of the oxygen cleaning of the second blowing plug 32, and the oxygen cleaning of the third blowing plug is the same as in the case of the first to second blowing plugs 31 and 32. I do.
  • the ladle 1 of the present embodiment has the same configuration as that of the first embodiment except that the number of the blowing plugs 3 is increased, and exhibits the same effect as that of the first embodiment. That is, the ladle 1 of this embodiment can reduce the labor (working cost) required for connecting the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow-in plug 3). Further, the ladle 1 of this embodiment has improved operator safety in oxygen cleaning. In particular, the ladle 1 of this embodiment has three blowing plugs 3, and the number of connection points between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow-in plug 3) is reduced to one. The above effect can be exhibited more reliably. Although the second embodiment includes three blowing plugs 3, the same effect can be exhibited even if the number of blowing plugs 3 is 4 or more.
  • This embodiment is the same ladle 1 as in the first embodiment, except that the control device 47 has a switch for instructing the operator to switch the valve 42.
  • the ladle 1 of this embodiment has an effect of being able to select the blowing plug 3 from which the cleaning gas is blown out, if necessary.
  • the valve 42 can flow gas not only to one of the first gas flow path 43 and the second gas flow path 45 but also to both the first gas flow path 43 and the second gas flow path 45. It is the same ladle 1 as in the first embodiment except that the valve is used.
  • the valve 42 of this embodiment allows gas from the gas receiving port 41 to flow through the first gas flow path 43, the second gas flow path 45, and both the first gas flow path 43 and the second gas flow path 45. Can be switched as follows.
  • the gas supplied to the gas receiving port 41 can be selectively supplied to one or both of the two blowing plugs 31 and 32.
  • the cleaning gas can be blown out from one of the first blowing plug 31 and the second blowing plug 32 at the time of oxygen cleaning. Then, when it is determined that the flow rate of the cleaning gas of one blowing plug 3 (first blowing plug 31) exceeds a predetermined flow rate (first predetermined flow rate), the other blowing plug 3 (second blowing plug 32) is used. Switch to blow out cleaning gas.
  • the valve 42 is connected from any of the three blowing plugs 3.
  • Cleaning gas can be blown out. That is, by blowing out the cleaning gas from two blowing plugs 3 (plural blowing plugs 3) that are close to each other, oxygen cleaning of the two blowing plugs 3 can be performed at the same time, and the workability of oxygen cleaning is improved. It is effective. At this time, the cleaning gas is not supplied to the remaining blowing plugs 3 that are not oxygen-cleaned.
  • the ladle 1 of the present embodiment has a pressure accumulating cylinder that stores the gas in a pressurized state in a circuit that supplies the stirring gas to the blowing plug 3.
  • gas (stirring gas stored in the tank) is supplied to the blowing plug 3 from this cylinder.
  • the ladle 1 of this embodiment moves by disconnecting the connection with the stirring gas supply device. At this time, by supplying the stirring gas stored in the tank to the blowing plug 3 and blowing it out, it is possible to prevent the molten steel from entering the inside of the through hole of the blowing plug 3 during movement. Therefore, the blockage of the through hole of the blowing plug 3 is suppressed, and the usage time when the ladle 1 is repeatedly used can be lengthened.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
PCT/JP2021/011103 2020-03-31 2021-03-18 ガス吹き込み装置 WO2021200225A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21780918.5A EP4129527A4 (de) 2020-03-31 2021-03-18 Gasblasvorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020065228A JP7346780B2 (ja) 2020-03-31 2020-03-31 ガス吹き込み装置
JP2020-065228 2020-03-31

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JP2009018321A (ja) * 2007-07-11 2009-01-29 Tokyo Yogyo Co Ltd 取鍋
JP2012135779A (ja) * 2010-12-24 2012-07-19 Sumitomo Metal Ind Ltd 取鍋の操業方法

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JP2017217695A (ja) 2016-06-10 2017-12-14 東京窯業株式会社 鋼の連続鋳造方法
JP6762168B2 (ja) 2016-08-29 2020-09-30 東京窯業株式会社 ガス供給装置

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JPH0554533U (ja) * 1991-12-24 1993-07-20 川崎炉材株式会社 溶融金属ガス吹込み攪拌装置
JP2009018321A (ja) * 2007-07-11 2009-01-29 Tokyo Yogyo Co Ltd 取鍋
JP2012135779A (ja) * 2010-12-24 2012-07-19 Sumitomo Metal Ind Ltd 取鍋の操業方法
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