TW202039116A - Casting apparatus for steel continuous casting process - Google Patents

Abstract

A casting apparatus for steel continuous casting process is described, which includes a ladle, a tundish and an air ring. The ladle is used to accommodate molten steel. The tundish connected to the ladle and is configured to distribute molten steel from the ladle to undertake the continuous casting of molten steel. The air ring surrounds a connection interface between the ladle and the tundish. The air ring includes an inner wall and an upper surface connected to the inner wall. There are plural side outlets disposed on the inner wall, and there are plural upper outlets disposed on the upper surface. The air ring is configured to guide air flow and to output the air flow from the side outlets and the upper outlets.

Description

Casting device for steelmaking and continuous casting process

The present invention relates to a casting device, and more particularly to a casting device used in a steelmaking continuous casting process.

In the continuous casting process of steelmaking, the molten steel is transported from the ladle to the molten steel distributor. Long nozzles or casting pipes are often used. During the casting process, argon gas is introduced into the pipe to prevent molten steel. Oxidize on contact with air. However, in the event of poor airtight operation, the molten steel that has been refined will be suspected of being contaminated.

Generally, during continuous casting operations, the operator will try to keep the bottom of the ladle as close to the casting pipe as possible to reduce the gap and improve the air tightness. However, in actual operation, due to the viewing angle, the gap can not be approached and the outside world Air pollution of molten steel and renitrogenation or reoxygenation. In addition, when the bottom of the ladle is too close to the casting pipe, problems such as collisions and dumping of the molten steel distributor are likely to occur.

Therefore, one purpose of the present invention is to provide a casting device for steelmaking and continuous casting process, which can solve the problem of poor air tightness during traditional continuous casting and casting operations. To maintain the quality of molten steel.

According to the above objective of the present invention, a casting device for steelmaking and continuous casting process is provided. The casting device of this steelmaking continuous casting process includes a ladle, a molten steel distributor and an air flow output ring. The ladle is used to contain molten steel. The molten steel distributor is connected to the ladle to receive molten steel for continuous casting. The air output ring surrounds the connection interface between the ladle and the molten steel distributor. Wherein, the air flow output ring has an inner wall and an upper surface connecting the inner wall. A plurality of side air outlet holes are arranged on the inner wall, and a plurality of upper air outlet holes are arranged on the upper surface. The air flow output ring is configured to introduce air flow to output through the side air outlet and the upper air outlet.

According to an embodiment of the present invention, the above-mentioned ladle has a long casting nozzle underneath, and a casting pipe above the molten steel distributor. The air flow output ring is arranged on the casting pipe, and the inner wall of the air output ring and the casting pipe The opening is butted, and the long casting nozzle is placed in the air flow output ring.

According to an embodiment of the present invention, there is a gap between the air flow output ring and the ladle, and the air flow output from the air outlet above the air flow output ring forms an upward air curtain in the gap.

According to an embodiment of the present invention, the flow rate of the above-mentioned airflow is 600LPM, and the gap range is 10mm-30mm.

According to an embodiment of the present invention, the above-mentioned air flow output ring further includes an air inlet, a first passage, and a second passage. Wherein, the first channel communicates with the air inlet and the upper air outlet, and the second channel communicates with the air inlet and the side air outlet.

According to an embodiment of the present invention, the above-mentioned air flow output ring has an outer wall, the outer wall and the inner wall are connected on opposite sides of the upper surface, and the air inlet holes are provided Placed on the outer wall.

It can be seen from the above that the design of the air flow output ring of the present invention can change the air flow field in the steelmaking casting pipe under the condition that there is a gap between the ladle and the air flow output ring. Moreover, an upward air curtain flows out from the gap by the air outlet on the air output ring, so it can block the outside air from entering the casting pipe to maintain a positive pressure in the casting pipe, which can effectively improve the existence of the gap. Air tightness to maintain the quality of molten steel. On the other hand, the use of the air output ring can provide a larger operating space for the operator, and there is no need to close the ladle to the casting pipe, so collisions or accidents of the molten steel distributor can be avoided.

100‧‧‧Steelmaking continuous casting process casting device

110‧‧‧Steel drum

111‧‧‧Long Cast Mouth

120‧‧‧Molten steel distributor

121‧‧‧Casting tube

121a‧‧‧Open

122‧‧‧Pouring nozzle

130‧‧‧Air flow output ring

131‧‧‧Outer wall

133a‧‧‧Upper vent

132‧‧‧Inner wall

132a‧‧‧Side air outlet

133‧‧‧Upper surface

134‧‧‧Air inlet

135‧‧‧The first channel

136‧‧‧Second Channel

G1‧‧‧Gap

For a more complete understanding of the embodiments and their advantages, now refer to the following description in conjunction with the accompanying drawings, in which: [FIG. 1] shows a casting device of a steelmaking continuous casting process according to an embodiment of the present invention Schematic diagram; [FIG. 2] is a three-dimensional cross-sectional schematic diagram of a casting device for a steelmaking continuous casting process according to an embodiment of the present invention; and [FIG. 3] is a schematic diagram of a simulated gas flow according to an embodiment of the present invention Schematic diagram of the field.

Please refer to FIG. 1, which is a schematic diagram of a casting device for a steelmaking continuous casting process according to an embodiment of the present invention. Of this embodiment The casting device 100 for the steelmaking continuous casting process mainly includes a ladle 110, a molten steel distributor 120 and an air flow output ring 130. The steel bucket 110 is used to contain molten steel. The molten steel distributor 120 is arranged under the ladle 110 to receive the molten steel and further distribute the molten steel for subsequent continuous casting operations. In this embodiment, the air flow output ring 130 is arranged between the ladle 110 and the molten steel distributor 120 to prevent outside air from affecting the quality of the molten steel transmitted from the ladle 110 to the molten steel distributor 120.

As shown in FIG. 1, in one embodiment, the bottom of the ladle 110 is provided with a long casting nozzle 111, and the top and bottom of the molten steel distributor 120 are respectively provided with a casting pipe 121 and a casting nozzle 122. The long casting nozzle 111 of the ladle 110 is arranged above the casting pipe 121 of the molten steel distributor 120, so the molten steel flowing out from the long casting nozzle 111 can enter the molten steel distributor 120 from the casting pipe 121. In other embodiments, the long casting nozzle 111 of the ladle 110 can also be placed in the casting pipe 121 of the molten steel distributor 120, and the molten steel can also enter the molten steel distributor 120 from the casting pipe 121. In this embodiment, the air flow output ring 130 is arranged between the ladle 110 and the molten steel distributor 120 and surrounds the connection interface between the ladle 110 and the molten steel distributor 120. The aforementioned “connection interface” refers to the connection interface between the long nozzle 111 and the casting tube 121. For those who want to clarify, the connection interface between the ladle and the molten steel distributor is not limited to this, as long as the design of the ladle can transmit the molten steel to the molten steel distributor can be applied.

Please also refer to FIGS. 1 and 2 at the same time, in which FIG. 2 is a three-dimensional cross-sectional schematic diagram of a casting device for a steelmaking continuous casting process according to an embodiment of the present invention. For those who want to clarify, in order to show the overall structure of the air flow output ring 130 more clearly, Figure 2 only shows the truncated (half) air output ring, complete The air flow output ring 130 is a ring shape. The air output ring 130 is mainly used to introduce the dull gas into the connection interface between the ladle 110 and the molten steel distributor 120 described above. As shown in FIG. 2, the air flow output ring 130 has an outer wall 131, an inner wall 132 and an upper surface 133. The outer wall 131 is opposite to the inner wall 132, and the outer wall 131 and the inner wall 132 are connected to two opposite sides of the upper surface 133.

Please continue to refer to FIGS. 1 and 2, the inner wall 132 of the air flow output ring 130 is provided with a plurality of side air outlet holes 132 a, and the upper surface 133 is provided with a plurality of upper air outlet holes 133 a. In addition, the air flow output ring 130 further includes an air inlet 134, a first channel 135 and a second channel 136. The air inlet 134 is arranged on the outer wall 131 of the air flow output ring 130, the first channel 135 communicates with the air inlet 134 and the upper air outlet 133 a, and the second channel 136 communicates with the air inlet 134 and the side outlet 132. Wherein, the air inlet 134 is configured to be connected to an air supply source, whereby the air can enter the air output ring 130 through the air inlet 134, and the air entering the air output ring 130 can respectively exit from the top through the first channel 135 The air hole 133a flows out and flows out from the side air outlet hole 132a through the second passage 136.

Please refer to FIGS. 1 and 3 together, where FIG. 3 is a schematic diagram of a gas flow field simulated according to an embodiment of the present invention. In this embodiment, as shown in FIG. 1, the air flow output ring 130 is disposed above the casting tube 121 of the molten steel distributor 120, and the inner wall 132 of the air flow output ring 130 is butted with the opening 121 a of the casting tube 121. There is a gap G1 between the ladle 110 and the air flow output ring 130. Therefore, the airflow output from the upper air outlet 133a can form an upward air curtain in the gap G1 (for example, as shown by the upward arrow in FIG. 3), and the airflow output from the side air outlet 132a can surround the ladle 110 and the steel. Around the connecting interface of the liquid distributor 120 to block air (for example, the virtual The line arrow indicates the function entered. In some specific examples, depending on the steel type of the molten steel, the gas flow can be selected as other suitable gases such as nitrogen or argon.

Please also refer to Figure 1, Figure 2 and Table 1 below. Table 1 shows the simulated gas flow fields of this embodiment and a comparative example under the condition that the flow of the protective atmosphere (argon) is 600LPM. With different gaps G1 (in mm), the measured oxygen concentration (%) change list in the casting pipe. Among them, the air flow output ring of the comparative example is only provided with side air outlet holes on its inner wall, and does not have air outlet holes on the upper surface. It can be seen from Table 1 that under the condition that the flow of argon gas is 600LPM and the gap G1 is 10mm~30mm, the oxygen concentration in the casting tube is less than 1%, which means that the upper vent hole of the gas flow output ring 130 of this embodiment The design of 133a with side air outlet 132a can form an air curtain in the gap G1 to achieve airtightness, thereby effectively preventing the molten steel from oxidizing. On the other hand, when the gap G1 is increased to 30mm, the oxygen concentration (0.61%) in the casting pipe measured using the airflow output ring of the embodiment of the present invention is still less than that of the airflow output ring of the comparative example when the gap G1 is 10mm. The measured oxygen concentration in the casting pipe (1%). This means that the use of the air flow output ring 130 of this embodiment can exert a good airtight effect under the condition of a large gap G1, so the operator does not need to close the ladle 110 to the casting tube 121, thereby obtaining a larger The operating space can avoid collisions or dumping accidents of the molten steel distributor 120.

It can be seen from the above embodiments of the present invention that the airflow output of the present invention The design of the ring can change the air flow field in the steelmaking casting pipe under the condition that there is a gap between the ladle and the air output ring. Moreover, an upward air curtain flows out from the gap by the air outlet on the air output ring, so it can block the outside air from entering the casting pipe to maintain a positive pressure in the casting pipe, which can effectively improve the existence of the gap. Air tightness to maintain the quality of molten steel. On the other hand, the use of the air output ring can provide a larger operating space for the operator, and there is no need to close the ladle to the casting pipe, so collisions or accidents of the molten steel distributor can be avoided.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

130‧‧‧Air flow output ring

131‧‧‧Outer wall

133a‧‧‧Upper vent

132‧‧‧Inner wall

132a‧‧‧Side air outlet

133‧‧‧Upper surface

134‧‧‧Air inlet

135‧‧‧The first channel

136‧‧‧Second Channel

Claims (6)

A casting device for a steelmaking continuous casting process, comprising: a ladle for containing a molten steel; a molten steel distributor connected to the ladle to receive the molten steel for continuous casting; and an air flow output ring , Surrounding the connection interface between the ladle and the molten steel distributor, wherein the air flow output ring has an inner wall and an upper surface connected to the inner wall, the inner wall is provided with a plurality of side air outlets, and the The upper surface is provided with a plurality of upper air outlets, and the air flow output ring is configured to introduce air flow to output through the side air outlets and the upper air outlets. The casting device for the steel-making continuous casting process described in the first item of the patent application, wherein the ladle has a long casting nozzle below the ladle, and the molten steel distributor is provided with a casting pipe above the gas flow output ring On the casting pipe, the inner wall of the air flow output ring is butted with an opening of the casting pipe, and the long casting nozzle is placed in the air flow output ring. The casting device for the steelmaking continuous casting process described in the first item of the patent application, wherein there is a gap between the airflow output ring and the ladle, and the airflow output from the upper air outlet holes of the airflow output ring is The gap forms an upward air curtain. For the casting device of the steelmaking continuous casting process described in item 3 of the scope of patent application, the flow rate of the airflow is 600LPM, and the range of the gap is 10mm~30mm. The casting device of the steel-making continuous casting process described in the scope of patent application 1, wherein the air flow output ring further includes an air inlet, a first channel, and a second channel, wherein the first channel communicates with the air inlet Hole and the upper air outlet holes, and the second channel communicates with the air inlet hole and the side air outlet holes. The casting device of the steelmaking continuous casting process as described in the scope of the patent application, wherein the air flow output ring has an outer wall, the outer wall and the inner wall are connected on opposite sides of the upper surface, and the air inlet is arranged at The outer wall.

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