JPH026807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot metal transport device that transports hot metal from a blast furnace to a converter while suppressing heat radiation of the hot metal.

[Prior art] When transporting hot metal tapped from a blast furnace to a converter, hot metal is poured into a hot metal ladle placed on a hot metal ladle moving cart from above, and after the injection is completed, the hot metal ladle is moved. Move the cart to the converter. After charging the hot metal into the converter, iron ore is added as a cold material to the molten steel in the converter. This iron ore is reduced to iron in the converter, increasing the iron yield. However, during transport, the hot metal radiates heat, and the temperature of the hot metal drops by approximately 200°C by the time the hot metal ladle reaches the converter. In this way, when the hot metal temperature decreases, the amount of iron ore added must be reduced.
Since the amount of iron produced by reducing iron ore decreases, the iron yield decreases. Therefore, it is necessary to suppress the heat radiation of the hot metal during transportation.

Methods of suppressing heat radiation from hot metal include placing a heat insulating lid over the hot metal pot while transporting the hot metal;
Another possibility is to install a heat insulating material in the hot metal ladle.

[Problems to be solved by the invention] However, there are steps such as hot metal pretreatment and slag removal between the blast furnace and the converter, and when the hot metal ladle is covered with a lid, it is necessary to close the lid each time. Needs to be removed. In this case, the lid must be installed and removed using a crane, and this operation takes a long time. For this reason, the time required for the hot metal to arrive at the converter is extended due to the attachment and detachment of the lid, and the temperature of the hot metal ends up decreasing instead. Therefore, there is a problem in that the hot metal ladle can only be covered for a very short period during transportation, and a drop in the temperature of the hot metal cannot be sufficiently suppressed.

In addition, heat radiation from the surface of the hot metal is more intense than heat radiation from the outer circumferential surface of the hot metal ladle, so even if insulation is attached to the hot metal ladle, the temperature of the hot metal is only about 1°C lower than when no insulation is used. There is a problem that the heat dissipation of the hot metal cannot be sufficiently suppressed.

This invention was made in view of the above circumstances, and it is possible to keep the lid on at all times during transportation of hot metal and when work such as preliminary treatment of hot metal is not being performed, thereby suppressing heat radiation of hot metal. The purpose is to provide a hot metal transporting device that can.

[Means for Solving the Problems] A hot metal conveying device according to the present invention comprises a hot metal ladle into which hot metal is poured, a hot metal ladle moving means for conveying the hot metal ladle, and a hot metal ladle that is placed on the hot metal ladle. It is characterized by having a pair of heat-insulating lids that keep hot metal warm, and a means for opening and closing the heat-insulating lids installed on the hot metal pot moving means. In this case, it is preferable to attach a heat insulating material to the surface of the heat-insulating lid that is irradiated with radiant heat of the hot metal. Further, it is preferable to attach a heat insulating material to the hot metal ladle to block radiant heat from the lining refractory.

[Function] In this invention, a hot metal ladle is installed in the hot metal moving means, and hot metal is poured into the hot metal ladle. and,
A heat-insulating lid is placed over the hot metal pot using a heat-insulating lid opening/closing means attached to the hot metal moving means. and,
When performing work such as hot metal pretreatment and slag removal, open the heat insulating lid to expose the top of the hot metal pot, and after completing the work, place the heat insulating lid on top of the hot metal pot. In this way, the heat insulating lid can be easily attached and detached without using a crane, so the heat insulating cover can be quickly attached and detached. Therefore, even if the heat insulating lid is attached or removed for hot metal pretreatment or the like, the time required to transport the hot metal is about the same as in the conventional method. Therefore, the heat insulating lid can be placed on the hot metal ladle at all times during hot metal transportation and while hot metal preliminary treatment is not being performed, so that a drop in the temperature of the hot metal can be reliably suppressed. Further, by disposing a heat insulating material on at least one of the heat-insulating lid and the hot metal ladle, a drop in temperature of the hot metal is further suppressed.

[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a sectional view of a hot metal conveying device according to an embodiment of the present invention. The hot metal ladle 11 has an iron skin lined with a refractory, and hot metal 12 is poured into it from a blast furnace through an opening at the top. Between the refractory lined with this hot metal pot 11 and the iron skin,
A heat insulating material 15 made of silica-based refractory material is interposed to suppress heat radiation from the outer peripheral surface of the hot metal ladle. The hot metal pot moving trolley 14 is mounted on a track 23 via wheels 24 attached to its lower part.
The furnace is designed to move back and forth between the blast furnace and the converter. In the center of the hot metal pot moving cart 14, there is a pair of supports 43 on which the hot metal pot 11 is installed.
The hot metal ladle 11 is rotatably supported by a support 43 via a shaft 44. Hot metal pot 1
1 is being transported, the hot metal ladle 11 is held so as not to rotate by a stopper (not shown), and by removing this stopper at the converter, the hot metal ladle 11 is
1 is rotated to transfer the hot metal to the charging pot.

The pair of heat retaining lids 13 have a semicircular shape and are composed of an outer skin 16a made of metal or an alloy, and a heat insulating material 16b made of ceramic fiber and attached to the inside of the outer skin 16a. This semicircular heat-retaining lid 13 is combined at its diameter to form a disk shape.
By placing these on the hot metal pot 11,
The circular opening of the hot metal pot was almost completely blocked.
Heat radiation from the surface of the hot metal 12 is suppressed. FIG. 2 is a schematic diagram showing the structure of the heat-insulating lid. Expanded metal 40 is attached to the surface of the outer skin 16a that is irradiated with the radiant heat of the hot metal 12, and cement 41 is applied thereon.
The fixing pin 42 is made of ceramic, embedded in cement 41, and expanded metal 4.
Fixed to 0. The heat insulating material 16b is fixed by this pin 42. In addition, a heat insulating material 32 is attached to the periphery of the heat insulating lid 13 on the hot metal ladle 11 side, so that when the heat insulating lid 13 is placed on the hot metal ladle 11, the heat insulating lid 13 and the hot metal ladle 11 are connected to each other. This prevents heat from radiating between the parts. and,
This heat-insulating lid 13 is attached and detached by a mechanism described later.

Bases 25 are installed on both sides of the hot metal pot moving truck 14, sandwiching the hot metal pot 11 therebetween. The support member 19 has a rod shape, and one end thereof is rotatably connected to the end of the base 25 on the hot metal ladle 11 side by a coupling pin 26. At the other end of this support member 19 is a heat insulating lid 13.
are rotatably connected by a connecting pin 28. The cylinder 17 has its base end rotatably connected to the vicinity of the center of the support member 19 by a coupling pin 29, and the piston 18 of the cylinder 17 has its end located on the side of the base 25 opposite to the hot metal ladle 11 side. is rotatably connected to the end of the The piston 18 is configured to move forward or backward into the cylinder 17 by driving an electric motor (not shown). The heat-insulating lid 13 closes the open part of the hot metal ladle 11 by advancing the piston 18 from inside the cylinder 17, and is rotated in the directions of arrows 33 and 34 by moving the piston 18 back into the cylinder 17, thereby closing the hot metal ladle. 11 openings are opened.
The cylinder 20 has its base end rotatably connected to the outer edge of the heat insulation lid 13 by a coupling pin 31, and the piston 21 of the cylinder 20 has its end connected to a fixing member 22 fixed to the support member 19. They are rotatably connected by a connecting pin 30. Then, by driving an electric motor (not shown) with the insulation lid 13 open, the piston 21 moves into the cylinder 20 and moves the tip of the insulation lid 13 in the direction of arrows 35 and 36. It is designed to be lowered. As a result, even if the height of the tip of the thermal cover 13 is higher than the vehicle limit with the heat insulating lid 13 open, by lowering the tip, the height of the hot metal transport device can be brought within the vehicle limit. You can enter it.

Next, the operation of the device configured in this way will be explained. First, the hot metal ladle 11 is placed on the hot metal ladle moving cart 14. Next, hot metal 12 is poured into the hot metal ladle 11 from the blast furnace with the insulation lid 13 open. Thereafter, if the tip of the heat-insulating lid 13 is lowered, the piston 21 of the cylinder 20 is advanced to raise the tip of the heat-insulating lid 13. Then, the piston 18 of the cylinder 17 is advanced to rotate the heat insulating lid 13 over the hot metal ladle 11, and the opening of the hot metal ladle is closed by the heat insulating lid 13. Then, the hot metal pot moving cart 14 is moved toward the converter on the track 23. In processes such as hot metal treatment and slag removal, the piston 18 is moved into and out of the cylinder 17, and the insulation lid 13 is rotated in the direction of arrows 33 and 34 to the position shown by the dashed line to open the opening of the hot metal ladle 11. let When the insulation lid 13 is rotated in this manner, if the upper end of the insulation lid 13 becomes higher than the vehicle limit, the piston 21 is retracted into the cylinder 20 and the tip of the insulation lid 13 is moved to the arrow 35. , 36, and lowered to the position shown by the two-dot chain line in FIG. When the work such as hot metal treatment is completed, the piston 21 is advanced from the cylinder 20, and then the piston 18 is advanced from the cylinder 17, so that the insulation lid 13 is rotated and the opening of the hot metal ladle 11 is closed. It is blocked again. in this way,
By moving the piston forward and backward, the hot metal ladle 1
The heat-insulating lid 13 that keeps the hot metal 12 in the hot metal 1 warm can be easily opened and closed in a short time, so even if the heat-insulating lid 13 is opened and closed for hot metal pretreatment etc., the hot metal can be transported in the same amount of time as in the past. Can be done. Therefore, during transportation of the hot metal 12, the heat insulating lid 13 can be placed on the hot metal ladle 11 at all times outside of working hours such as hot metal pretreatment. Therefore, the heat retaining lid 13 is more effective in keeping the hot metal 12 warm.

Next, the heat retention effect of hot metal by the apparatus of this embodiment will be explained. FIG. 3 is a graph showing the temperature change of hot metal, with the elapsed time after tapping on the horizontal axis and the hot metal temperature on the vertical axis. a indicated by a solid line in the figure
This is a case where a conventional device is used to transport the hot metal ladle with a heat insulating material interposed between the refractory lining of the hot metal ladle and the steel shell, and the top of the ladle is opened. and c shown by a broken line is the case when the apparatus according to this embodiment is used. And, c is the case where a heat insulating material is interposed between the lining refractory and the iron skin of the hot metal ladle, and b is the case where no heat insulating material is interposed. According to FIG. 3, after 180 minutes, which is the average time required to transport hot metal to the converter, there is a temperature drop of 200°C in the case of the conventional equipment. On the other hand, b
Case 2 showed a temperature 30°C higher than the conventional case a, and case c showed a temperature 43°C higher than case a. In this way, by making it possible to easily attach and detach the heat insulating lid of the hot metal pot, the effect of suppressing the temperature drop of the hot metal becomes greater, and
Due to the effects of both the heat-insulating lid and the heat insulating material disposed in the hot metal pot, it is possible to further suppress the temperature drop of the hot metal.

In addition, in this example, a cylinder and a piston were used as the means for opening and closing the heat-insulating lid.
The present invention is not limited to this, and various means may be used, such as means for opening and closing the heat insulating lid by winding or unwinding a wire rope.

[Effects of the Invention] According to the present invention, there is no need to use a crane or the like to attach and detach the hot metal pot, so the heat-insulating lid of the hot metal pot can be easily and quickly attached and detached. Therefore, it is possible to attach and detach the heat retaining lid in a short time, and even if the heat retaining lid is attached and detached during molten metal pretreatment etc. while transporting hot metal, the hot metal can be transported in about the same amount of time as conventional methods. Therefore, the hot metal ladle can always be covered with a heat-insulating lid during the transportation of the hot metal and outside of working hours such as pre-treatment of the hot metal, which is extremely effective in suppressing a drop in the temperature of the hot metal.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a hot metal conveying device according to an embodiment of the invention, FIG. 2 is a schematic diagram showing the structure of a heat-insulating lid, and FIG. 3 is a graph showing the effects of the invention. 11; Hot metal pot, 12; Hot metal, 13; Heat insulation lid, 1
4; Hot metal pot moving trolley, 15, 16b, 32; Insulation material, 16a; Outer skin, 17, 20; Cylinder, 1
8, 21; Piston, 19; Support member, 22; Fixed member, 23; Track, 24; Wheel, 25; Base,
26, 27, 28, 29, 30, 31; connecting pin, 40; expanded metal, 41; cement, 42; fixing pin, 43; strut, 44; shaft.

Claims (1)

[Scope of Claims] 1. A hot metal ladle into which hot metal is injected, a hot metal ladle moving means for transporting the hot metal ladle, a pair of insulation lids placed on the hot metal ladle to keep the hot metal warm, and a hot metal ladle that is placed on the hot metal ladle to keep the hot metal hot. A hot metal transporting device comprising: opening/closing means installed on the hot metal ladle moving means so as to sandwich the ladle from the front and back, and opening and closing each of the heat insulation lids. 2. The hot metal transporting device according to claim 1, wherein a heat insulating material is pasted on a surface of the heat insulating lid that is irradiated with radiant heat of the hot metal. 3. The hot metal conveying device according to claim 1, wherein the hot metal ladle is provided with a heat insulating material that blocks radiant heat from the lining refractory.