CN103849708A - Converter slagging device and method for controlling converter slagging - Google Patents

Abstract

The invention discloses a converter slag lowering device and a method for controlling converter slag lowering. The device comprises: a slag lowering flow channel with a plate-shaped structure, which is obliquely fixed on a ladle car and arranged on the steel tapping direction of the converter In front of the ladle, the lower slag runner includes a first surface facing away from the ladle car body and a second surface facing the ladle car body, and the lower slag runner includes a first end and a lower side than the first end along the height direction. The second end; and the retaining wall, including a first retaining wall and a second retaining wall, the first retaining wall and the second retaining wall are respectively fixed on the left and right sides of the first surface of the lower slag flow channel to limit the flow of the converter slag aisle. The converter slag lowering device and the method for controlling converter lower slag using the device according to the present invention can avoid the phenomenon of steel slag falling into the ladle during the process of reducing the tilting angle of the converter after the converter molten steel is exhausted, improve the quality of molten steel, and at the same time avoid The steel slag splashes on the ladle car and causes the burning loss of the ladle car and its supporting equipment.

Description

Converter slag lowering device and method for controlling converter slag lowering

technical field

The invention belongs to the technical field of slag blocking in converter tapping. Specifically, the invention relates to a converter slag lowering device and a method for controlling converter slag lowering by using the device.

Background technique

In the prior art, a tapping slag blocking device is used to carry out the slag blocking operation for converter tapping. In the process of reducing the tilting angle of the converter when the molten steel is exhausted at the end of tapping, the ladle car needs to move with the change of the tilting angle of the converter to receive the steel slag flowing from the tapping hole and prevent the high temperature steel slag from burning the steel Chartered vehicles and their supporting equipment. The steel slag flowing into the ladle will react violently with the carbon in the molten steel to cause boiling, and the steel slag overflowing the ladle will burn out the supporting equipment of the ladle car, hindering the smooth progress of the converter tapping. In addition, handling the ladle cars welded to the cooled steel slag also increases the labor intensity of the on-site workers.

Contents of the invention

An object of the present invention is to overcome the disadvantages of the above-mentioned technologies, and provide a converter slag discharging device that can improve the quality of molten steel and a method for controlling converter slag discharging using the device.

Another object of the present invention is to overcome the disadvantages of the above-mentioned technologies, and provide a converter slag removal device that can avoid steel slag burning and damaging the ladle car and its supporting equipment during the tapping process of the converter, and a method for controlling converter slag removal using the device.

According to one aspect of the present invention, there is provided a device for lowering slag in a converter, the device includes: a slag lowering flow channel with a plate-like structure, which is obliquely fixed on a ladle car, and is arranged on the ladle in the tapping direction of the converter In the front, the lower slag runner includes a first surface facing away from the ladle car body and a second surface facing the ladle car body, and the lower slag runner includes a first end and a second side lower than the first end along the height direction. end; retaining wall, including a first retaining wall and a second retaining wall, the first retaining wall and the second retaining wall are respectively fixed on the left and right sides of the first surface of the lower slag flow channel, so as to limit the flow channel of the converter slag.

According to the device of the present invention, the lower slag runner can be formed by welding steel plates and welded on the ladle car, and the first surface of the lower slag runner can be laid with refractory bricks.

According to the device of the present invention, the lower slag flow channel and the horizontal plane can form an included angle of 45°.

According to the device of the present invention, the first end can be in contact with the ladle and not higher than the opening of the ladle.

According to the device of the present invention, the first retaining wall and/or the second retaining wall may be made of steel plates.

According to the device of the present invention, the length of the first retaining wall may be equal to the length of the second retaining wall and not greater than the length of the lower slag runner.

According to another aspect of the present invention, there is provided a method for controlling converter slag using the above-mentioned device, the method includes the following steps: at the end of converter tapping, operating the ladle car to make the converter tapping steel flow close to the above-mentioned converter slag Device; when the molten steel is exhausted, the furnace is lifted to increase the tilting angle of the converter, so that the converter slag flows into the slag flow channel.

According to the method of the present invention, when the converter is tapping, a slag monitoring device can be installed near the converter and/or a tapping slag blocking device can be installed in the converter.

The converter slag lowering device and the method for controlling converter lower slag using the device according to the present invention can avoid steel slag falling into the ladle during the process of reducing the converter tilting angle after the converter molten steel is exhausted, and improve the quality of molten steel. In addition, the use of the device can also avoid the burning loss of the ladle car and its supporting equipment caused by steel slag splashing on the ladle car.

Description of drawings

These and/or other aspects and advantages of the present invention will become apparent and more comprehensible from the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which:

1 is a schematic diagram of a converter slag removal device according to an exemplary embodiment of the present invention;

Fig. 2 is a perspective view of a converter slagging device according to an exemplary embodiment of the present invention.

Explanation of reference signs:

1 ladle car

2 ladles

3 slag runner

4 retaining wall

Detailed ways

The converter slagging device and the method for controlling converter slagging using the device of the present invention will be described in detail below with reference to the accompanying drawings and exemplary embodiments.

FIG. 1 is a schematic diagram of a converter slag removal device according to an exemplary embodiment of the present invention, and FIG. 2 is a perspective view of a converter slag removal device according to an exemplary embodiment of the present invention. The converter slagging device and the method for controlling converter slagging using the device of the present invention will be described in detail below with reference to FIG. 1 and FIG. 2 .

Referring to FIG. 1 and FIG. 2 , a converter slag lowering device according to an exemplary embodiment of the present invention includes a slag lowering flow channel 3 and a retaining wall 4 . The lower slag runner 3 is a plate structure with a first surface and a second surface, the first surface is away from the ladle car 1 vehicle surface, and the second surface faces the ladle car 1 vehicle surface. The lower slag runner 3 is fixed on the ladle car 1 with a certain inclination angle, and is arranged in front of the ladle 2 in the tapping direction of the converter. The lower slag runner 3 includes a first end and a second end along its height direction, the first end is close to the ladle 2, the second end is away from the ladle 2, and the height of the first end is higher than that of the second end. The lower slag runner 3 can introduce the steel slag poured out of the converter into the steel slag tank located below the second end of the lower slag runner 3 . The retaining wall 4 is divided into a first retaining wall and a second retaining wall, and is respectively fixed on the left and right sides of the first surface of the lower slag runner 3, so that the retaining wall 4 and the lower slag runner 3 together define a channel for steel slag flow. At the end of tapping, adjust the position of the converter to make it close to the first end of the lower slag runner 3, and carry out the furnace lifting operation in time when the molten steel is exhausted, so that the steel slag in the converter is poured into the lower slag runner 3 and along the The first surface of the lower slag runner 3 flows into the steel slag tank from the second end of the lower slag runner 3 . At this time, the retaining walls 4 located on the left and right sides of the lower slag runner 3 can block the splashing generated during the process of the converter pouring steel slag into the lower slag runner 3, thereby avoiding the impact of the splashed high-temperature steel slag on the left and right car body equipment of the ladle car 1. burn out. Although the lower slag runner 3 has a plate-like structure, the present invention is not limited thereto, that is to say, the lower slag runner 3 may have a certain radian, and the radian may be determined according to specific conditions.

According to an exemplary embodiment of the present invention, the lower slag runner 3 can be made by welding metal plates (for example, steel plates), or can be built by refractory materials. When the lower slag runner 3 is made of a metal plate, refractory bricks can be laid on the metal plate of the lower slag runner 3 to reduce the corrosion of the metal plate by the steel slag, and it is also beneficial for the bonded steel slag on the first surface of the lower slag runner of clearing. The thickness of the lower slag runner 3 is not particularly required, and may be the minimum thickness capable of withstanding the high-speed impact of the slag flow. The width of the lower slag runner 3 can be determined according to the amount of slag discharged from the converter, the speed of slag pouring and the viscosity of the slag.

According to an exemplary embodiment of the present invention, the length of the lower slag runner 3 can be determined according to the positions of the first end and the second end of the lower slag runner 3 and the angle between the lower slag runner 3 and the horizontal plane, so that the lower slag flow The first end of the track 3 is close to or in contact with the ladle 2, the second end is located on the upper part of the slag tank, and the first end is higher than the second end. Preferably, the length of the slag lowering channel 3 can be increased to lower the level of the second end, which can reduce the range of splashing caused when steel slag flows into the steel slag tank from the second end. But the present invention is not limited thereto, that is to say, a slag storage device can be set so that steel slag flows into the slag storage device through the second end of the lower slag flow channel 3, at this time, the height of the slag storage device can be controlled to reduce The range of splashing caused by steel slag flowing into the slag storage equipment can reduce the length of the slag lower flow channel 3 .

According to an exemplary embodiment of the present invention, preferably, the included angle between the lower slag runner 3 and the horizontal plane is 45°, which can facilitate the drainage of the steel slag by the lower slag runner 3 and reduce the dumping of steel slag from the converter into the The height of the back splash during the lower slag runner 3 is also conducive to the treatment of the remaining cooled slag accumulated on the lower slag runner 3 .

According to an exemplary embodiment of the present invention, the retaining wall 4 can be welded to the left and right sides of the first surface of the lower slag runner 3 by metal plates (for example, steel plates) perpendicular to the first surface of the lower slag runner 3, so as to Prevent the splashing and burning of the left and right car body equipment of the ladle car 1 generated during the pouring of steel slag into the lower slag flow channel 3 . The height of the retaining wall 4 can be the minimum height to prevent the splashing generated during the pouring of steel slag into the slag lowering channel 3 . But the present invention is not limited thereto, that is to say, the retaining wall 4 can be formed by laying refractory bricks, and the angle between the first retaining wall and/or the second retaining wall and the first surface of the lower slag runner 3 Can be obtuse or acute.

According to an exemplary embodiment of the present invention, the length of the first retaining wall and the second retaining wall may be equal and not greater than the length of the lower slag runner 3 . But the present invention is not limited thereto, that is to say, the length of the first retaining wall and the second retaining wall can prevent the steel slag falling into the slag flow channel 3 from splashing and prevent the steel slag from flowing to the car body equipment of the ladle car 1 of any length.

According to an exemplary embodiment of the present invention, the first end of the lower slag runner 3 may not be higher than the ladle opening of the ladle 2 , but the present invention is not limited thereto.

Hereinafter, the method for controlling converter slag by using the above-mentioned device will be described in detail with reference to the accompanying drawings and in combination with exemplary embodiments of the present invention.

First, at the end of the converter tapping period, the ladle car 1 is operated to make the converter tapping steel stream approach the device. Specifically, at the end of steel tapping, the ladle car 1 is operated to jog, so that the steel flow is close to the first end of the slag flow channel 3, and the steel flow is ensured to flow into the ladle 2. The tilting angle of the large converter can pour molten steel and/or steel slag into the lower slag runner 3 .

Secondly, when the molten steel in the converter is exhausted, the furnace lifting operation is performed to increase the tilting angle of the converter, so that the converter slag flows into the lower slag flow channel 3 . Specifically, the furnace lifting operation is performed when the molten steel is exhausted, and the ladle car 1 does not follow the flow (that is, does not follow the slag flow and moves). As the tilting angle of the converter increases, the slag flow in the converter directly flows out from the tap hole and falls into the lower slag runner 3, and flows along the first surface of the lower slag runner 3 from the second end of the lower slag runner 3 to the In the slag storage tank below the second end. At this time, since the ladle car does not follow the flow, the steel slag is prevented from being poured into the ladle, and the quality of molten steel is improved.

According to an exemplary embodiment of the present invention, when tapping the converter, preferably, a slag monitoring device can be installed near the converter and/or a tapping slag stop device can be installed in the converter, so that the slagging of the converter can be controlled more precisely Operation, in order to reduce the entrainment of too much molten steel in the steel slag and avoid the steel slag from flowing into the ladle 2 during the slag discharge process of the converter.

According to the converter slag lowering device and the method for controlling converter lower slag using the device of the present invention, when the molten steel is exhausted, it only takes 1 second to pour the steel slag into the slag lowering channel 3 and introduce it into the slag storage tank by lifting the furnace Inside, avoiding the pollution of steel slag flowing into ladle 2 to molten steel. In addition, the retaining walls 4 arranged on the left and right sides of the lower slag flow channel 3 also prevent the equipment on the left and right sides of the ladle car from being splashed and burned by steel slag poured into the lower slag flow channel 3 during the converter slag discharge process.

While the present invention has been described with reference to specific embodiments and drawings, it is to be understood that the present invention is not limited to the above embodiments.

Claims (8)

1. A device for lowering slag in a converter, said device comprising: The lower slag runner with a plate-like structure is obliquely fixed on the ladle car and arranged in front of the steel ladle in the direction of converter tapping. The lower slag runner includes the first surface facing away from the ladle car and the first surface facing the steel The second surface of the package car surface, and the lower slag runner includes a first end and a second end lower than the first end along the height direction; The retaining wall includes a first retaining wall and a second retaining wall, and the first retaining wall and the second retaining wall are respectively fixed on the left and right sides of the first surface of the lower slag runner, so as to limit the flow channel of the converter slag. 2. The device according to claim 1, wherein the lower slag runner is formed by welding steel plates and welded on the ladle car, and the first surface of the lower slag runner is laid with refractory bricks. 3. The device according to claim 1, wherein the lower slag runner forms an included angle of 45° with the horizontal plane. 4. The apparatus of claim 1, wherein the first end is in contact with the ladle and is no higher than the mouth of the ladle. 5. The device of claim 1, wherein the first and/or second retaining wall is made of steel plate. 6. The device according to claim 1, wherein the length of the first retaining wall is equal to the length of the second retaining wall and not greater than the length of the slag lowering channel. 7. A method of controlling converter slag, said method comprising the following steps: At the end of the converter tapping process, the ladle car is operated to make the converter tapping steel flow close to the converter slag removal device described in claim 1; When the molten steel is exhausted, the furnace is lifted to increase the tilting angle of the converter, so that the converter slag flows into the slag flow channel. 8. The method according to claim 7, further comprising: installing a slag monitoring device near the converter and/or installing a tapping slag stop device in the converter when tapping the converter.

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