Method of supplying power to a mixed iron cart

Abstract

To provide a method for supplying electric power to a torpedo car capable of supplying electric power for driving a tilting device of a furnace body to the torpedo car stopped in an emergency in a highly cost-effective manner.SOLUTION: Provided is a method for supplying electric power to a torpedo car having a furnace body for receiving hot metal through a hot metal receiving port and a tilting device for tilting the furnace body. An electric vehicle capable of outputting electric power necessary for driving the tilting device is made close to the torpedo car, electric power is supplied to the torpedo car from a secondary battery mounted on the electric vehicle, and the hot metal is discharged by tilting the furnace body.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention particularly relates to a method for supplying power to a mixer car that has stopped in an emergency.

Background Art

[0002] When a mixer car such as a torpedo car stops in an emergency such as a power outage while molten iron discharged from a blast furnace or the like is charged into the furnace body of the mixer car, the temperature of the molten iron in the furnace body of the mixer car decreases, and after a certain period of time, the molten iron may solidify and adhere to the inside of the furnace body. Such an adherent made of solidified molten iron reduces the capacity of the furnace body, and in some cases, the mixer car itself may become unusable. Further, when such solidified molten iron adheres to the inside of the furnace body, more energy is required than when only liquid molten iron is tilted. Furthermore, since such adhesion causes an imbalance in the weight balance, if an attempt is made to tilt the furnace body by driving the tilting device to discharge the molten iron, there is a risk that the mixer car will tip over.

[0003] Therefore, when the mixer car stops for a certain period of time or more due to a power outage or the like, it is necessary to drive the tilting device at the stop position to tilt the furnace body and take measures such as discharging the molten iron on the spot. However, usually, the driving of the tilting device of the mixer car is only performed at a specific location, such as when discharging the molten iron into a ladle at a steelmaking plant. Therefore, it is normal that the mixer car itself is not equipped with a power source for driving the tilting device, and it is not possible to tilt the furnace body at the stop position in an emergency.

[0004] On the other hand, as a technology for securing power in an emergency such as a power outage, Patent Document 1 discloses a technology in which a storage battery (secondary battery) is mounted on a mixer car in advance. Further, Patent Document 2 discloses an emergency charging system in which power is supplied by a power supply vehicle in an emergency of an electric vehicle.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, the technology described in Patent Document 1 is a technology that generates electricity from the axle to charge and mainly operates control systems such as coupling parts, and it is difficult to supply enough power to operate a tilting device. Furthermore, installing a large-capacity emergency secondary battery on a molten iron truck would require securing a large separate space, and installing a secondary battery that would only be used infrequently, such as in emergencies, is not cost-effective. In addition, the technology described in Patent Document 2 is a technology that supplies power so that an electric vehicle can travel to a charging station, and it is not a technology that supplies the power necessary to tilt a furnace body containing several hundred tons of molten iron.

[0007] Furthermore, in the event of an emergency where the iron mixing truck stops, it is conceivable to deploy a vehicle equipped with a large external battery to supply power to the truck and drive the tilting mechanism. However, this would be difficult to connect without someone familiar with maintenance, and since large external batteries are not used under normal circumstances, it would not be cost-effective.

[0008] In view of the aforementioned problems, the present invention aims to provide a method for supplying power to a molten iron cart that is cost-effective and capable of supplying power to drive the furnace tilting device when the molten iron cart is stopped in an emergency. [Means for solving the problem]

[0009] The present invention is as follows: (1) A method for supplying power to a molten iron cart, comprising a furnace body that receives molten iron through a receiving port, and a tilting device for tilting the furnace body, The tilting device is, The system includes a tilting motor for tilting the furnace body, an electromagnetic brake and an eddy current brake for controlling the rotation of the furnace body, and a gear grease pump for circulating lubricating oil in a gearbox that controls the rotational speed of the tilting motor. An electric vehicle capable of outputting the power necessary to drive the tilting device is brought close to the iron mixing vehicle. Using the first DC-DC converter From the secondary battery installed in the aforementioned electric vehicle The voltage is adjusted to the voltage to be input to the first DC-AC inverter. After adjusting the voltage, the first DC-AC inverter is used to convert from DC to AC and supply power to the tilting motor, the second DC-DC converter is used to supply DC power to the electromagnetic brake and the eddy current brake, and the second DC-AC inverter is used to convert from DC to AC and supply power to the gear grease pump. A method for supplying power to a molten iron cart, characterized by supplying power to the cart and tilting the furnace body to discharge molten iron. (2) The method for supplying power to a molten iron cart according to (1) above, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body so that the receiving port is in a position lower than directly above, thereby oscillating the molten iron. (3) A method for supplying power to a molten iron cart according to (1) or (2) above, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body at regular time intervals in a first direction with respect to the main shaft and in a second direction opposite to the first direction. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a method for supplying power to a molten iron cart that is cost-effective and capable of supplying power to drive the furnace body tilting device to a molten iron cart that has stopped in an emergency. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing the external appearance of a mixed iron cart. [Figure 2] This diagram illustrates the circuit configuration when connected to a commercial power supply. [Figure 3] This diagram illustrates the circuit configuration when power is supplied from an electric vehicle. [Modes for carrying out the invention]

[0012] The embodiments of the present invention will be described below with reference to the drawings. First, the mixed iron cart to which power is supplied in this embodiment will be described.

[0013] FIG. 1 is a diagram schematically showing the appearance of a hot metal mixer. As shown in FIG. 1, the hot metal mixer 10 includes a furnace body 11, a carriage 12, and a tilting device 13. The hot metal mixer receives the hot metal discharged from the blast furnace into the furnace body 11 and transports the hot metal to a converter or the like. The furnace body 11 is provided with a receiving port (not shown) and has a capacity to receive about 150 to 300 t of hot metal. The carriage 12 is for transporting the furnace body 11 from the blast furnace to the hot metal discharging site and travels on the rails.

[0014] The tilting device 13 includes a tilting motor for tilting the furnace body 11, and tilts the furnace body 11 to discharge the hot metal from the receiving port. That is, the tilting device 13 tilts the furnace body 11 in the clockwise direction or the counterclockwise direction with respect to the main shaft connecting to the tilting device 13 on the opposite side of the furnace body 11, and discharges the hot metal in the furnace body 11 so that the receiving port is at a position lower than directly above. Further, the tilting device 13 can tilt the furnace body 11 so that the receiving port is at a position lower than directly above to swing the hot metal, or tilt the furnace body 11 in the clockwise direction and the counterclockwise direction at regular time intervals in order to reduce heat dissipation and delay the solidification due to the soaking of the hot metal.

[0015] In addition, in order to drive the tilting device 13 and tilt the furnace body 11 as described above, external power is required. In the present embodiment, not only can power be received through fixed equipment at the hot metal discharging site or the like, but also power can be received from an electric vehicle through portable equipment. First, an example of receiving power through fixed equipment will be described.

[0016] FIG. 2 is a diagram for explaining a system for supplying power using a commercial power supply. A connection plug 203 is provided on the tilting device 13 of the hot metal mixer 10, and power is supplied from a commercial power supply (3φ, 200V) to the tilting device 13 by connecting to the connection connector 202 of the fixed equipment.

[0017] On one hand, the tilting device 13 is provided with a tilting motor 204, an electromagnetic brake 205, an eddy current brake 206 and a gear grease pump 207. When power is supplied to the tilting motor 204, the electromagnetic brake 205 and the eddy current brake 206, they are driven to drive the gearbox 208.

[0018] The tilting motor 204 rotates by the supplied alternating current power to tilt the furnace body. The electromagnetic brake 205 releases the disk brake by the supplied direct current power to release the prevention of the furnace body rotation. The eddy current brake 206 generates a force to inhibit rotation by the supplied direct current power to adjust the tilting speed of the furnace body. The gear grease pump 207 circulates the lubricating oil in the gearbox. The gearbox 208 reduces the rotational speed of the tilting motor to the rotational speed matching the tilting speed of the furnace body.

[0019] Here, since the electromagnetic brake 205 and the eddy current brake 206 are driven by a direct current, a DC brake AC-DC converter 201 is provided in the fixed equipment. A part of the power from the commercial power supply 200 is converted from alternating current to direct current by the DC brake AC-DC converter 201, and the power by direct current is supplied to the electromagnetic brake 205 and the eddy current brake 206.

[0020] Normally, the milling mixer 10 travels to the milling yard, connects the connection connector 202 of the fixed equipment in the milling yard and the connection plug of the tilting device 13, and the tilting device 13 is driven by the power supplied from the commercial power supply 200 to tilt the furnace body 11 to discharge the molten iron. However, when natural disasters such as earthquakes and typhoons occur and the milling mixer 10 cannot travel due to fallen trees or the like, the molten iron remains accommodated in the furnace body 11 for several hours or more until restoration and arrival at the milling yard.

[0021] Therefore, in this embodiment, in such an emergency, by receiving power from a generally popular electric vehicle, it is possible to discharge the molten iron at an emergency discharging yard before the molten iron solidifies. Next, an example of receiving power from an electric vehicle will be described.

[0022] Figure 3 illustrates a system for supplying power using an electric vehicle. The configuration on the mixed iron truck side is the same as in Figure 2, so a detailed explanation is omitted.

[0023] The electric vehicle 300 is, for example, an electric vehicle that complies with the CHAdeMO standard Ver. 2.0 or higher and is capable of outputting 10kW or more of power as the power required to drive the tilting device 13. Note that, in order to protect the on-board secondary battery, the CHAdeMO standard imposes power supply limitations on some vehicle models, and some vehicle models cannot supply 10kW or more of power. The reason for requiring the output of 10kW or more of power is that if the output is less than 10kW, there will be insufficient power to tilt the furnace body containing the molten iron, making it impossible to tilt the furnace body. In this embodiment, the invention is not limited to the CHAdeMO standard; by providing connectors compliant with other standards and modifying the communication software, an electric vehicle capable of outputting 10kW or more of power compliant with other standards may also be used. Furthermore, the electric vehicle 300 is not limited to so-called EVs (Electric Vehicles), but may also be a fuel cell vehicle or the like, as long as it is capable of supplying power to the tilting device.

[0024] Next, the portable equipment will be described. The portable equipment is mainly stored in the trunk of an electric vehicle, and connects the secondary battery of the electric vehicle 300 to a CHAdeMO standard connector 301, and further connects the connection connector 306 to the connection plug 203 on the mixing truck side. This supplies power from the electric vehicle to the tilting device 13. However, unlike commercial power, the electric vehicle 300 is a DC power source, so the combination of inverter and converter differs from the fixed equipment shown in Figure 2.

[0025] The isolated DC-DC converter 302 adjusts the voltage from the electric vehicle's secondary battery to the voltage input to the DC-AC inverter 303 for the tilting motor. The DC-AC inverter 303 for the tilting motor is an inverter that converts DC to AC in order to supply power to the AC-driven tilting motor 204. The DC-DC converter 304 for the DC brake is for supplying DC power to the electromagnetic brake 205 and the eddy current brake 206. The DC-AC inverter 305 for the gear grease pump is an inverter that converts DC to AC in order to supply power to the AC-driven gear grease pump 207.

[0026] In addition to the configurations shown in Figures 2 and 3 for the mixing tank side, it is also possible to supply power to other equipment on the mixing tank side. In that case, a converter or inverter will be added to the fixed or portable equipment side as needed.

[0027] Next, a simulation was conducted to determine whether the solidification of molten iron inside the furnace could be prevented by supplying power using electric vehicles in the event of a disaster. The types of disasters considered were: a typhoon causing numerous fallen trees on the route of the torpedo truck due to strong winds, and a magnitude 6 earthquake occurring within the steelworks, resulting in the truck becoming immobile and making an emergency stop due to partial building collapse. For the damage caused by fallen trees due to strong winds, the time required for recovery (in this case, moving to the tapping area) was set at 5 hours, and for the damage caused by the earthquake, the time required for recovery was set at 10 hours.

[0028] Furthermore, if power is supplied from commercial power, the molten iron mixer is moved to the tapping area, the tilting device is driven using the tapping area's commercial power, and the molten iron is discharged from the furnace. If power is supplied from an electric vehicle or a large external battery, the washing pan is transported, the tilting device is driven using power from the electric vehicle or large external battery, the washing pan is positioned in place with a crane, and the molten iron is discharged from the furnace. In addition, the molten iron mixer is assumed to contain 150 tons of molten iron. The simulation results are shown in Table 1.

[0029] [Table 1]

[0030] The example shows normal operation when no disaster has occurred. In this case, the tilting device is driven using the fixed power supply of the tapping area, and the furnace body is tilted to discharge the molten iron. The molten iron did not solidify, and the discharge rate was 100%.

[0031] Example 1 is a simulation result in which, when a molten iron truck became immobile due to fallen trees caused by strong winds, an electric vehicle (vehicle type A) capable of outputting more than 10kW of power, used as a mobile service vehicle within the steelworks, immediately arrived, and preparations for transporting the washing pan, setting it up near the furnace body with a crane, and preparing to supply power from the electric vehicle to the molten iron truck using portable equipment were all accomplished within one hour. In this case, since the molten iron inside the furnace body had not yet solidified, the molten iron discharge rate was 100%, and there were no solidified deposits inside the furnace body.

[0032] Example 2 is a simulation result in which, in the event of an earthquake of magnitude 6 causing the vehicle to become inoperable, the same electric vehicle (model A) as in Example 1, located within the steelworks, immediately arrives, and preparations for transporting the washing ladle, setting it up near the furnace body with a crane, and supplying power from the electric vehicle to the molten iron truck using portable equipment are all completed within one hour. In this case, since the molten iron inside the furnace body had not yet solidified, the molten iron discharge rate was 100%, and there were no solidified deposits inside the furnace body.

[0033] Example 3 is a simulation result showing that when an earthquake of magnitude 6 rendered the vehicle immobile, the same electric vehicle (model A) as in Example 1 arrived immediately from within the steelworks. However, the preparation to transport the washing ladle and position it near the furnace body with a crane took more time than in Example 2, and including the preparation to supply power to the mixing truck, it took 1.5 hours. In this example, while the washing ladle was being positioned near the furnace body with a crane, power from the electric vehicle was used to tilt the furnace body so that the receiving port was lower than directly above, and the solidification of the molten iron was delayed by oscillating within an angle that did not cause molten iron leakage. As a result, 100% of the molten iron was discharged, and there was no solidified residue inside the furnace body.

[0034] Example 4 is a simulation result showing that when an earthquake of magnitude 6 rendered the vehicle immobile, the same electric vehicle (model A) as in Example 1 arrived immediately from within the steelworks. However, the preparation to transport the washing pan and position it near the furnace body with a crane took even longer than in Example 3, and including the preparation to supply power to the mixing truck, it took 2 hours. In this example, while the washing pan was being positioned near the furnace body with a crane, power from the electric vehicle was used to tilt the furnace body clockwise and counterclockwise at regular time intervals to delay the solidification of the molten iron. As a result, 100% of the molten iron was discharged, and there were no solidified deposits inside the furnace body.

[0035] Comparative Example 1 is a simulation result of preparing a large external battery from outside the steelworks when a molten iron truck became immobile due to fallen trees caused by strong winds. In this example, a lot of time was spent preparing the large external battery, including transporting it and connecting it, and this, along with transporting the washing pan and preparing to set it up near the furnace body with a crane, took 3 hours. Because so much time was required to supply power to the molten iron truck, it was not possible to tilt the furnace body to delay the solidification of the molten iron, and 50% of the molten iron inside the furnace body solidified during the discharge of the molten iron, resulting in a 50% discharge rate.

[0036] Comparative Example 2 shows the simulation results of a situation where a molten iron truck became immobile due to fallen trees caused by strong winds, and waited until it was restored. In this example, it took 5 hours for the molten iron truck to become operational again. After restoration, when the molten iron was discharged at the tapping plant, 70% of the molten iron in the furnace solidified, and 30% of the molten iron was discharged.

[0037] Comparative Example 3 is a simulation result in which, when a molten iron truck became immobile due to fallen trees caused by strong winds, an electric vehicle (vehicle type B) capable of outputting less than 10kW of power arrived immediately, and preparations for transporting the washing pan, setting it up near the furnace body with a crane, and supplying power from the electric vehicle to the molten iron truck using portable equipment were all completed within one hour. However, due to insufficient power output, the tilting device could not be driven, so it took 5 hours to wait until the molten iron truck was able to move again. As a result, when the molten iron was discharged at the tapping area after the restoration, 70% of the molten iron in the furnace body had solidified, and the amount of molten iron discharged was 30%.

[0038] Comparative Example 4 shows the simulation results of waiting for a vehicle to be restored after it became immobile due to an earthquake of magnitude 6. In this example, it took 10 hours for the molten iron truck to become operational again. After restoration, when an attempt was made to discharge the molten iron at the tapping plant, 100% of the molten iron inside the furnace had solidified and could not be discharged as molten iron.

[0039] As described above, according to this embodiment, even if the molten iron mixer truck stops in an emergency, power can be supplied from an electric vehicle used as a mobile service vehicle within the steelworks. This allows the tilting device to be quickly driven to discharge the molten iron from the furnace before it solidifies. As a result, even in the event of a disaster, the solidification of the molten iron inside the furnace can be prevented, and the molten iron mixer truck can be easily prevented from becoming unusable.

[0040] (Other embodiments) This embodiment includes the following methods.

[0041] (Method 1) A method for supplying power to a molten iron mixing vehicle having a furnace body that receives molten iron through a receiving port and a tilting device for tilting the furnace body, characterized in that an electric vehicle capable of outputting the power necessary to drive the tilting device is brought close to the molten iron mixing vehicle, power is supplied to the molten iron mixing vehicle from a secondary battery mounted on the electric vehicle, and the furnace body is tilted to discharge the molten iron.

[0042] (Method 2) A method for supplying power to a molten iron cart according to Method 1, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body so that the receiving port is in a position lower than directly above, thereby oscillating the molten iron.

[0043] (Method 3) A method for supplying power to a molten iron cart according to method 1 or 2, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body at regular time intervals in a first direction with respect to the main shaft and in a second direction opposite to the first direction. [Explanation of Symbols]

[0044] 10 Mixed iron car 11 Furnace body 12 bogies 13 Tilt device 200 Commercial power supply 201 AC-DC converter for DC brakes 202, 306 connection connectors 203 Connection Plug 204 Tilting motor 205 Electromagnetic brake 206 Vortex Brake 207 Gear Grease Pump 208 Gearbox 300 Electric Vehicles 301 Connector 302 Isolated DC-DC Converter 303 DC-AC inverter for tilting motors 304 DC-DC converter for DC brakes 305 DC-AC Inverter for Gear Grease Pump

Claims

1. A method for supplying power to a molten iron cart, comprising a furnace body that receives molten iron through a receiving port, and a tilting device for tilting the furnace body, The tilting device is, The system includes a tilting motor for tilting the furnace body, an electromagnetic brake and an eddy current brake for controlling the rotation of the furnace body, and a gear grease pump for circulating lubricating oil in a gearbox that controls the rotational speed of the tilting motor. An electric vehicle capable of outputting the power necessary to drive the tilting device is brought close to the iron mixing vehicle, and the voltage from the secondary battery mounted on the electric vehicle is adjusted using a first DC-DC converter to a voltage to be input to the first DC-AC inverter. A method for supplying power to a molten iron cart, characterized by adjusting the voltage, then using the first DC-AC inverter to convert from direct current to alternating current and supply power to the tilting motor, using the second DC-DC converter to supply direct current power to the electromagnetic brake and the eddy current brake, using the second DC-AC inverter to convert from direct current to alternating current and supply power to the gear grease pump, and tilting the furnace body to discharge the molten iron.

2. The method for supplying power to a molten iron cart according to claim 1, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body so that the receiving port is in a position lower than directly above, thereby oscillating the molten iron.

3. A method for supplying power to a molten iron cart according to claim 1 or 2, characterized in that, before discharging the molten iron, the tilting device is driven to tilt the furnace body at regular time intervals in a first direction with respect to the main shaft and in a second direction opposite to the first direction.

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