KR102033642B1 - Processing apparatus for molten material - Google Patents

Abstract

The present invention, the melt receiving space is formed therein, the melt injection portion is disposed on one side, the melt discharge port is formed on the other side, and one side is located between the injection portion and the discharge port so as to directly face the injection portion, the bottom of the container It is installed and connected to both side walls in the longitudinal direction, at this time, is installed in the falling region of the melt of the lower side of the injection portion, the melt treatment apparatus including a dam, the upper surface is located in the upper portion of the melt, to increase the reach area of the upward flow, A melt processing apparatus is proposed that can reduce the stagnant area of the melt and improve the ability to remove inclusions.

Description

Melt Treatment Equipment {PROCESSING APPARATUS FOR MOLTEN MATERIAL}

The present invention relates to a melt processing apparatus, and more particularly, to a melt processing apparatus that can improve the ability to remove inclusions by reducing the stagnant area.

Conventional continuous casting facilities include ladles carrying molten steel, tundish for temporarily storing molten steel from ladle, and continuously receiving molten steel from tundish to slab. It consists of a mold which first solidifies, a cooling stand which performs a series of molding operations and cools the casting continuously drawn from the mold.

When performing a continuous casting process in which castings are cast using a continuous casting facility, it is important to keep molten steel in the tundish for a sufficient time. For example, the molten steel must be kept inside the tundish for a sufficient time to smoothly separate the inclusions from the molten steel. In order for the molten steel to remain in the tundish for a sufficient time, the upward flow of the molten steel must be actively induced in the tundish.

The following Patent Document 1 breaks away from the flow control method of molten steel using dams and weirs, constructs a plurality of refractory dams in tundish such as dams, auxiliary dams and induction dams, and then injects argon gas into the molten steel through auxiliary dams. As a method of inducing an upward flow of molten steel is presented. In addition, Patent Document 2 discloses that the impact pad and the separation wall are installed under the shroud nozzle, and then the molten steel is collided with the impact pad and passed through the space between the separation wall and the impact pad to actively induce upward flow of the molten steel. The way is presented.

However, the methods proposed in Patent Documents 1 and 2 add manufacturing costs for constructing a large number of dams in tundish, complicated installation work, and a large number of refractory dams and a rear surface of the dividing wall (the side facing the tundish outlet). And increasing the stagnant region where the flow rate of the molten steel is very low near the region far from the impact pad.

In particular, when the stagnant region of the molten steel increases in the tundish, the extent to which the molten steel stays in the stagnant region becomes severe, and the residence time of the molten steel becomes excessively long. In other words, if the stagnant area of molten steel increases in the tundish, the molten steel cannot secure an appropriate residence time in the tundish. In addition, when the inclusions enter the stagnant region, the inclusions stay in the center of the stagnant region due to the low flow rate of the molten steel, but are not separated from the molten steel, and flow into the mold and finally cause the interfering quality defects in the cast steel.

Therefore, it is important to secure proper residence time of molten steel as well as to secure sufficient residence time of molten steel for floating separation of inclusions present in molten steel. In addition, it is important to reduce the size of the congestion area. In other words, it is important to reduce the size of the stagnant region while keeping the molten steel in the tundish for a sufficient time. To this end, it is necessary to minimize the formation of stagnant areas while actively inducing the upward flow of molten steel in the tundish.

The background art of this invention is published in the following patent document.

KR 10-2014-0085127 A KR 10-1602301 B1

The present invention provides a melt processing apparatus capable of ensuring a sufficient and proper residence time of a melt contained in a container.

The present invention provides a melt processing apparatus that can reduce the stagnant area of the melt to improve inclusion removal ability.

The present invention provides a melt processing apparatus capable of widely distributing an upward flow reaching the upper surface of the melt.

Melt processing apparatus according to an embodiment of the present invention, the melt receiving space is formed therein, the melt injection portion is disposed on one side, the melt discharge port is formed on the other side; And a dam disposed between the injection portion and the discharge port so that one surface thereof directly faces the injection portion, and installed at a bottom of the container and connected to both sidewalls in the longitudinal direction, wherein the dam is formed of a melt formed below the injection portion. It is installed in the drop zone, the upper surface is located above the melt.

The dam may be installed at an edge of the falling area.

The other side of the dam may directly face the side wall in the width direction of the outlet side.

The size of the falling region may be proportional to the size of the inner diameter of the injection portion, and the distance between one surface of the dam and the injection portion may be proportional to the size of the falling region.

The distance between one surface of the dam and the injection portion may be formed in a range of 2.5 to 5 times the inner diameter of the injection portion.

The dam may have a top surface in a range of 0.5 times to 0.75 times the height of the melt surface.

It may further include a through-hole formed in the dam.

The through hole is formed in the lower portion of the dam, is formed in the direction from the one side toward the other side, the inner wall may be directly connected to the bottom.

According to the embodiment of the present invention, a dam may be installed at the bottom of the container so as to be located at the edge of the melted oil part of the melt, and the height of the upper surface of the dam may be optimized to optimize the flow field of the melt. As a result, a sufficient and proper residence time of the melt contained in the container can be secured, and the stagnant area of the melt can be reduced to improve the inclusion removal ability. In addition, a strong flow of the molten steel in the molten metal portion can be induced to the upper surface of the melt to form an upward flow, thereby allowing a wide distribution of the upward flow reaching the upper surface of the melt, and further improving the ability to remove inclusions.

Therefore, the inclusions in the melt can be smoothly floated and separated to improve the cleanliness of the melt and to improve the quality of the product made of the melt.

In addition, it is not necessary to install an additional structure for reducing the flow rate of the melt in the container, it is possible to minimize and optimize the size and number of refractory structures installed in the container, and to simplify the structure, thereby reducing the manufacturing cost .

1 is a view for explaining a modeling structure for the flow evaluation of the melt treatment apparatus according to the embodiment and comparative examples of the present invention.
2 is a view showing a flow evaluation result of the melt treatment apparatus according to the embodiment and comparative examples of the present invention.
3 is a view showing quantitative values of the flow characteristics of the melt derived from the flow evaluation results according to the embodiments and comparative examples of the present invention.
4 is a view for explaining a modeling structure for the flow evaluation of the melt treatment apparatus according to the embodiment and comparative examples of the present invention.
5 is a view showing quantitative values of the flow characteristics of the melt derived from the flow evaluation results according to embodiments and comparative examples of the present invention.
6 is a view showing a flow evaluation result according to embodiments of the present invention.
7 and 8 are schematic views of a melt processing apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described an embodiment of the present invention; However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. Only embodiments of the present invention are provided to complete the disclosure of the present invention and to fully inform those skilled in the art the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated to describe embodiments of the invention, and like reference numerals in the drawings indicate like elements.

Melt treatment apparatus according to an embodiment of the present invention to reduce the stagnant area of the melt while increasing the upflow reach area of the upper surface of the melt to present a technical feature that can improve the inclusion removal ability. Melt treatment apparatus according to an embodiment of the present invention is applied to the continuous casting process of steel mill, it can be applied to various casting processes using a variety of melts. An embodiment of the present invention will be described based on a continuous casting process.

7 and 8 are schematic views showing a melt processing apparatus according to an embodiment of the present invention. 7 is a sectional view of the melt processing apparatus, and FIG. 8 is a perspective view of the melt processing apparatus. Here, the direction in which the width direction one side wall 1a and the width direction other side wall 1b shown in FIG. 7 are spaced apart from each other is one direction, and the direction in which the injection part 2 extends is the vertical direction. In addition, the direction crossing both the one direction and the height direction is the other direction. For example, the direction in which the dam 3 of FIG. 8 extends is another direction. One direction may be referred to as a longitudinal direction, the other direction may be referred to as a width direction, and the vertical direction may be referred to as a height direction.

7 and 8, a melt processing apparatus according to an embodiment of the present invention will be described. The melt processing apparatus includes a container 1 in which an accommodating space is formed inside, a melt injecting unit 2 is disposed at one side, and a melt outlet 1c is formed at the other side thereof, and one side of the melt processing unit is formed. It is located between the injection portion 2 and the discharge port (1c) to face directly, and includes a dam (3) installed on the bottom of the container (1) connected to both longitudinal side walls (1d).

At this time, the dam 3 is installed in the fall region of the melt formed below the injection portion 2, and the upper surface is located above the melt.

The melt (not shown) may comprise molten steel. The melt may be conveyed in a conveying container such as a ladle (not shown) to the melt processing apparatus, disposed above the vessel 1, and connected to the injector 2. The melt may be injected into the container 1 through the injection part 2. Of course, the melt can vary in addition to molten steel.

On the other hand, the lower part of the melt is a section from the bottom of the container 1 to less than 0.5 times the height of the melt surface height. The upper part of the melt is a section from a height of 0.5 times the height of the melt surface to the melt surface height of the melt. For example, if the bottom height of the container 1 is 0, and the melt surface height of the melt is 1, the height from 0 to less than 0.5 is the lower portion of the melt, and the height from 0.5 or more to 1 is the upper portion of the melt.

Here, the melt surface height of the melt refers to the height of the melt formed at a constant height in the container 1 in a steady state during the continuous casting process. For example, the melt surface height of the melt may be referred to as a molten steel level or a melt surface level. On the other hand, the steady state means a steady state with respect to the melt flow inside the vessel 1.

The injection unit 2 is a refractory nozzle through which the melt can pass, and may be a shroud nozzle. The injection part 2 is mounted in a manipulator (not shown), and the opening of the upper end can be coupled to the collector nozzle (not shown) of the container by the raising of the manipulator. The injection part 2 is arranged on one side of the container 1, is spaced apart from the bottom of the container 1, an opening at the lower end is located inside the container 1, and at least a part thereof can be immersed in the melt.

The falling region (hereinafter, referred to as a falling region) of the melt is formed below the injection portion 2. The drop region is the region through which the melt injected into the container 1 passes through the injection section 2 first. In the dropping region, the melt supplied by dropping from the injection unit 2 may collide with the bottom of the container 1 and flow at a predetermined speed along the bottom with relatively high energy. The speed of the melt then gradually decreases away from the drop zone, and the melt can flow at normal flow rates with relatively low energy.

The dropping region is formed on the bottom of the container 1, and its center c is aligned in the vertical direction on a vertical axis (not shown) in the vertical direction passing through the center of the injection portion 2. The size of the drop region, for example, the width in one direction, is proportional to the size of the inner diameter of the injection section 2. As the inner diameter of the injection portion 2 increases, the size of the drop region also increases in proportion to the inner diameter of the injection portion 2. Here, the inner diameter of the injection part 2 is an inner diameter based on the opening of the lower end of the injection part 2, and one direction is an extension direction of the container 1, and is directed from the injection part 2 toward the discharge port 1c. Direction.

The distance between the edge end of the falling region in one direction and the center c may be 2.5 to 5 times the inner diameter d of the injection part 2. In the drop zone, the melt can actively flow at a predetermined range of speeds. The melt in the drop zone has a significant velocity.

In this case, the melt having a meaningful speed means that the melt has a speed enough to form an upward flow instead of falling after colliding with the dam 3 and flooding. The melt flow in the drop zone can influence the formation of the entire melt flow in the vessel 1, in which the drop zone is a significant area. On the other hand, a falling area is also called a hot water part.

The container 1 has a melt accommodating space formed therein, a melt injecting portion 2 is disposed at one side thereof, and a melt discharge port 1c is formed at the other side thereof. The container 1 may for example comprise a tundish. In this case, the tundish may be a rectangular tundish extending in one direction.

The container 1 has a rectangular bottom extending in one direction and another direction crossing one direction, each extending in one direction along both long sides of the edge of the bottom, and protruding in the vertical direction, respectively, And widthwise sidewalls 1a and widthwise other sidewalls 1b extending in the other directions along the both side short sides of the edge of the bottom and protruding in the vertical direction. The injection portion 2 is disposed relatively close to the one side wall 1a in the width direction, and the discharge port 1c is formed relatively in the vicinity of the other side wall 1b. The bottom of the container 1 may have a step shape in which the other height is lower than the height of one side.

The melt accommodating space is formed by the bottom, both side walls 1d in the longitudinal direction, one side wall 1a in the width direction, and the other side wall 1b in the width direction. The longitudinal side walls 1d face in the other direction, and the width direction one side wall 1a and the width direction other side wall 1b face in one direction.

The injection part 2 is disposed on one side of the bottom but spaced apart in the vertical direction from one side of the bottom, and the injection part 2 may be disposed on the upper part of the container 1. In addition, the outlet 1c may be formed by penetrating the other side of the bottom in the vertical direction. A discharge nozzle (not shown) such as an immersion nozzle is provided through the discharge port 1c under the container 1, and a mold (not shown) is disposed to surround the lower part of the immersion nozzle. The opening 1c may have an opening degree controlled by a slide gate (not shown), and may discharge the melt into the mold. The mold may solidify the melt into the slabs.

A cooling stand (not shown) is provided below the mold. The cooling stand can perform a series of forming operations while cooling and depressing continuously cast pieces in the mold. The cast steel passing through the cooling stand may be cut at the cutting unit (not shown), and may be transferred to a rolling facility, or may be transferred to various post-treatment facilities depending on the use.

The vessel 1 has a function of adjusting and dispensing a melt supply amount to a mold (not shown), a function of reducing a pressure such as iron static pressure by the load of the melt, and controlling the flow of the melt to remove the inclusions to improve cleanliness. Perform the function. At this time, the dam 4 is installed at the bottom of the container 1 to remove the inclusions. The dam 4 serves to control the flow of the melt to increase the residence time of the melt, thereby causing the slag and inclusions contained in the melt to rise to the upper surface of the melt, for example the hot water surface. As the slag and inclusions floating up the top of the melt are separated from the melt, incorporation of the inclusions and slag into the mold can be minimized.

The dam 3 is positioned between the injection part 2 and the discharge port 1c so that one surface thereof directly faces the injection part 2, and is installed at the bottom of the container 1, and extends in the other direction, so that both side walls in the longitudinal direction are extended. It is connected to the opposite faces of (1d). The dam 3 may be supplied from the inlet 2 to the vessel 1 to raise the flow of melt flowing along the bottom to the top of the vessel 1.

One surface of the dam 3 is a surface facing the side surface 1a and the injection portion 2 in the width direction among both side surfaces of the dam 3 extending in the width direction and the vertical direction. The other surface of the dam 3 is the surface which faces the other side wall 1b and the discharge port 1c of the width direction among the both sides of the dam 3 mentioned above. In this case, one surface of the dam 3 may be referred to as a front surface, and the other surface of the dam 3 may be referred to as a rear surface.

The fact that one side of the dam 3 is located between the injection part 2 and the discharge port 1c so as to directly face the injection part 2 means that no separate structure is installed between the dam 3 and the injection part 1. Means that. Here, the separate structures include various walls, including weirs and auxiliary dams, containers such as impact pads, and various structures having various shapes. That is, since no separate structure is installed between the dam 3 and the injection unit 2, one side of the dam 3 may directly face the injection unit 2. By installing the dam 3 directly facing the inlet 2, the melt supplied to the drop zone is directly affected by the dam 3 without disturbing and the flow can be controlled. In other words, after the melt falls to the bottom, the first impact may occur on the dam 3 to form an upward flow.

At this time, since the momentum of the melt decreases as it moves away from the drop zone, the dam 3 may be installed in the drop zone to effectively induce an upward flow of the melt. At this time, the dam 3 is provided in the other direction so as to face the melt in the falling region at the edge of the falling region so as to avoid direct collision with the falling melt. The dam 3 may first contact the melt flowing along the bottom of the container 1 in the direction from one side of the container 1 to the other side in this installation position. In other words, the dam 3 is directly exposed to the melt in the falling zone at the edge of the falling zone and can be in direct contact. In this case, direct contact means that the melt and the dam 3 preferentially contact before the melt is first brought into contact with a separate structure, for example, and the flow is controlled. Of course, since only the dam 3 is formed in the drop zone, the melt in the drop zone may be in contact with the dam 3 exclusively except for the bottom and sidewalls of the container 1.

On the other hand, as for the dam 3, the other surface can directly face the width direction side wall 1b by the side of the discharge port 1c. That is, no separate structure is installed between the dam 3 and the outlet 1c. As such, only one dam 3 is installed inside the container 1, and the melt may be controlled by one dam 3.

The distance between one surface of the dam 3 and the injection portion 2 may be proportional to the size of the falling region. As the size of the falling area increases, the distance L between one surface of the dam 3 and the injection part 2 may be increased. In this case, the distance between one surface of the dam 3 and the injection portion 2 may be formed in the range of 2.5 times to 5 times the inner diameter (d) of the injection portion. Thus, at least one surface of the dam 3 may be located at the edge of the falling region. The dam 3 may have an upper surface at the top of the melt. Based on the bottom near one side of the container (1), the upper surface height (H) of the dam (3) may be formed in the range of 0.5 to 0.75 times the height of the melt surface. If the height of the upper surface of the dam 3 is less than 0.5 times the height of the molten metal of the melt, a smooth upward flow cannot be formed, and the melt hardly rises to the large surface of the molten metal. If the melt surface exceeds 0.75 times the height of the melt, the dam 3 will not only prevent widespread upflow of the melt surface, but in particular, the top surface of the dam 3 will exceed 0.75 times the melt surface height. In this case, the melt may rise above the current level of the hot water surface and overflow to flow out of the container 1.

The melt processing apparatus described above is called a melt processing apparatus according to the first embodiment. Hereinafter, a melt processing apparatus according to a second embodiment of the present invention will be described. The melt processing apparatus according to the second embodiment of the present invention further includes a through hole (not shown) formed in the dam 3 while including the above-described components of the melt processing apparatus according to the first embodiment.

The through hole is formed in the lower portion of the dam (3), is formed in a direction from one side of the container 1 to the other side, the inner wall may be directly connected to the bottom of the container (1).

According to embodiments of the present invention, only the dam 3 is installed in the container 1, the installation position of which is the edge of the falling region, and the upper surface is positioned above the melt. By designing the inner profile of the vessel 1 and controlling the flow of the melt in this way, it is possible to create an upward flow from the drop zone and induce a flow of the melt so that the stagnant region in the vessel 1 is less than 10%. In this way, the inclusion removal efficiency may be improved by 50% or more. In addition, it is possible to reduce the production cost of refractory due to the non-use of the weir, and to reduce the cost of manufacturing molten steel. The dam structure of the melt treatment apparatus according to the embodiments of the present invention described above may be referred to as a tundish dam structure of less than 10% of the stagnation area for producing ultra-clean steel, for example.

Hereinafter, it will be described in detail in comparison with the comparative examples that the melt processing apparatus according to the above-described embodiments of the present invention can widely distribute the upward flow reaching the upper surface of the melt while reducing the stagnant region of the melt to improve inclusion removal ability. do.

1 is a view for explaining a modeling structure for the flow evaluation of the melt treatment apparatus according to the embodiment and comparative examples of the present invention. 2 is a view showing a flow evaluation result of the melt treatment apparatus according to the embodiment and comparative examples of the present invention. 3 is a view showing quantitative values of the flow characteristics of the melt derived from the flow evaluation results according to the embodiments and comparative examples of the present invention.

Melt treatment apparatus according to embodiments of the present invention is a device for reducing the inclusions in the melt as much as possible in accordance with the shape and design value of the dam in the continuous casting process, after building the structure in various forms inside the container (1), flow By analyzing the characteristics, the internal shape of the container 1, such as the shape and design value of the dam 3, is designed with an optimal profile.

1 (a) is a modeling structure of the melt processing apparatus according to the first embodiment of the present invention, wherein the upper surface height of the dam 3 may be, for example, 600mm, which is 2/3 of the melt surface height. FIG. 1B is a modeling structure of the melt processing apparatus according to the first comparative example, in which no integral structure is installed in the container 1. FIG. 1C is a modeling structure of the melt processing apparatus according to the second comparative example in which the impact pad 4 is installed directly under the injection unit 2, and (d) is an auxiliary surface having an upper surface of 40 mm having a lower height in the drop region. It is a modeling structure of the melt processing apparatus which concerns on the 3rd comparative example in which the dam 5 is provided and the dam provided with the through-hole is provided in the back. At this time, in the third comparative example, a dam having a through hole is not installed to directly face the injection unit 2. At this time, the upper surface height of the dam provided with the through-hole is 450 mm, which is 1/2 of the height of the melt surface, and the installation position is outside the drop zone. On the other hand, to be distinguished from the dam 3 of the first embodiment hereinafter, a dam provided with a through hole is referred to as 3 '.

FIG. 1E is a modeling structure of the melt processing apparatus according to the fourth comparative example of the present invention, in which only the auxiliary dam 5 is provided in the drop zone. Fig. 1 (f) shows a modeling structure of the melt processing apparatus according to the fifth comparative example of the present invention so as to be far from the drop zone and closer to the outlet 1c side than the injection section 2, for example from the center of the drop zone. The auxiliary dam 5 is installed in the position where the distance is 1500 mm. Meanwhile, in the modeling structures of FIG. 1, the injection hole inner diameter was 160 mm.

2 (a) to 2 (f) are the results of numerical analysis of the internal flow of the container 1 with the modeling structure of (a) to (f) of FIG. In the case of (c) showing the second comparative example, it is confirmed that the upward flow toward the molten surface of the melt is strongly formed, but the upward flow reaching area A is smaller than in Example 1. In the case of (a) of the first embodiment, it can be seen that the upflow reaching area A is most widely distributed. Thus, in the embodiment it can be seen that the opportunity of contact between the slag of the hot water and the inclusions of the melt increases than the comparative examples.

In contrast to Comparative Example 3 of Embodiments 1 and (d) of FIG. 2A, only the dam 3 is provided in the drop zone so that the dam 3 contacts the melt before the auxiliary dam 5, so that the rise It can be confirmed that the increase in the flow arrival area A is effective. In contrast to Comparative Example 4 of Embodiments 1 and (e) of FIG. 2A, it can be seen that the design value of the height of the dam 3 in the embodiment for increasing the upflow reach area A is quite effective. In contrast to Comparative Example 3 of Embodiments 1 and (d) of FIG. 2 (a) and Comparative Example 5 of (f), it can be seen that it is important to install the dam 3 in the falling region.

The structure of the dam 3 of the melt processing apparatus according to the embodiments of the present invention is an optimized profile for the purpose of increasing the plug volume and reducing the dead volume in the melt. The graph can assess the ability to remove inclusions in the melt.

FIG. 3 shows quantitative values for analyzing the flow characteristics of the melt through a residence time distribution curve graph for the modeling shapes of the examples and comparative examples shown in FIG. 1.

First, the residence time distribution curve constitutes a continuous casting facility for the water model experiment, and then, while performing a water model experiment of the continuous casting process, injects a predetermined amount of the experimental solution (dye) into the injection portion for 2 to 3 seconds, and discharges Detecting the concentration of the solution over time in the graph is represented on the dimensionless time axis.

In other words, the residence time distribution curve can be referred to as a standard concentration graph with dimensionless time measured at the outlet when dye is added to the inlet side of the flow. Of course, this curve can be derived using numerical analysis rather than numerical model experiments. The residence time distribution curve can be used to determine, for example, the degree of mixing of molten steel and the effects of inclusion separation by varying the capacity and internal shape of the tundish.

In the figure, the minimum time (Min. Time) is the time at which the concentration of the test solution was first detected. Peak time is the time when the concentration of the test solution is the highest. Mean Time is a value obtained by dividing the inner volume of the container 1 by the melt injection flow rate at the inlet 2. The melt injection flow rate is the same for both the examples and the comparative examples, but the contents of the vessel 1 vary depending on the internal profile of the vessel 1.

The active mean residence time is a value obtained by dividing the area of the curve when the dimensionless value of the measured average time is 2 or more by the average residence time. The active region fraction or active volume fraction is the fraction of the region where the mixing of the molten steel takes place and includes the plug volume fraction and the mixed volume fraction. The stagnant zone fraction or stagnant volume fraction is the fraction of the zone where the melt flows very slowly, twice as long as the average residence time of the melt in the vessel.

For example, the molten steel volume in the tundish is divided into an active volume and a dead volume. The active volume is an area in which molten steel is mixed, and the dead volume is an area in which no mixing occurs. The active volume is divided into a plug volume and a mixed volume. In the plug volume, molten steel is piped at the same velocity flow, and interlayer mixing is not performed, and the flow direction, that is, the mixing in the horizontal direction occurs in the whole region. The mixed volume is the area where the mixing is maximized and where mechanical stirring takes place. Dead volume, also known as stagnant zone, is a fluid zone that moves very slowly in a vessel and stays twice as long as the average residence time. Meanwhile, Vp in the drawing refers to the plug volume fraction, Vd refers to the static region fraction, and Vm refers to the mixed volume fraction.

In the drawing, the smaller the static volume fraction, the more favorable the separation separation inclusion, and the larger the Vp / Vd value and the Vp / Vm value, the more favorable the separation separation inclusion. Since the residence time distribution curve and the quantitative figures of the flow characteristics derived therefrom are well known in the field of flow analysis, a detailed description thereof is omitted.

The peak time is related to the plug volume, which can be seen to show the largest value in the embodiment. The case of Example 1 is the best result. Looking at the ratio of the stagnant region, it can be seen that Example 1 and Comparative Example 2 are less than 10%. All other comparative examples can be seen to exceed 10%. In contrast to Example 1 and Comparative Example 1, it can be seen that the reduction of the stagnant area is effective to 4.7% to 5.8%. This is the inclusion removal effect of 41% to 50% in terms of inclusion removal ability. In addition, in order to effectively remove the inclusions, the plug volume should be high and the retention area should be low. Example 1 and Comparative Example 2 show the best results.

However, when referring to FIG. 2 above, considering the arrival area of the upward flow, it can be confirmed that the case of the embodiment is more effective than the comparative example 2. In addition, Comparative Example 2 has a complicated structure, high cost, and weakness in durability, so that the embodiment can meet the purpose of reducing the congestion area, but the structure is simple and the upflow can be widely distributed on the surface of the water. Proved.

4 is a view for explaining a modeling structure for the flow evaluation of the melt treatment apparatus according to the embodiment and comparative examples of the present invention. 5 is a view showing quantitative values of the flow characteristics of the melt derived from the flow evaluation results according to embodiments and comparative examples of the present invention. 6 is a view showing a flow evaluation result according to embodiments of the present invention.

Hereinafter, the flow evaluation was further carried out by changing the installation position, the number, and whether or not the through hole with the design value of the upper surface of the dam 3 according to the embodiment of the present invention.

In the figure, P1 is a dam 3 installation position according to the first embodiment, P2 is a position spaced rearward from P1 by a distance L, and P3 is a position spaced rearwardly by a distance 2L from P1. At this time, L was set to 500 mm and flow evaluation was performed.

The position of FIG. 5 is a dam 3 installation position, for example, P1 + P2 of the comparative examples 10 and 11 means that the dam 3 was installed in the P1 position and the P2 position. The rest likewise indicate the installation position. Whether it is a hole means whether the outlet is formed.

FIG. 6A is a numerical result of the internal flow of the container 1 for Example 1 of FIG. 5, and (b) is a numerical result of the internal flow of the container 1 for Example 2. FIG.

Looking at the value of the congestion region, it can be seen that in Example 1 and Example 2 has a very small value. In other words, the dam is constructed as in Example 1, but when the outlet is installed, the inclusion removal ability is further improved. On the other hand, looking at Comparative Examples 6 to 17, it can be seen that installing the dam far away or installing several more in addition to the drop zone adversely affects the ability to remove inclusions. Thus, as in the embodiment of the present invention, if one dam is provided in the edge of the drop zone in the container 1 and its upper surface height is the upper part of the melt, the size of the stagnant zone can be considerably reduced to around 5%. As shown in (a) and (b) of FIG. 6, it can be seen that the upward flow can reach a wide area of the hot water surface, and thus it can be seen that the reduction of the amount of inclusions is possible.

On the other hand, if the design factors of the dam 3 designed as described above are further explained, the distance between the center c of the falling region and the one side wall 1a in the width direction is the center c of the falling region and the dam 3. It should be greater than the distance between one side of the surface, and less than the distance between the center c of the falling area and the other surface of the dam 3, and the width, for example, the thickness in one direction of the dam 3, should be in the range of 50 mm to 200 mm. Of course, the top height of the dam 3 should be greater than 1/2 of the melt bath height and less than 3/4. When the dam 3 is designed to have such a design value, since the size of the stagnant region is small and the distribution area of the upward flow is large, effective inclusion reduction as in the above-described flow evaluation results is possible.

The above embodiment of the present invention is for the description of the present invention, not for the limitation of the present invention. It is to be noted that the configurations and manners disclosed in the above embodiments of the present invention will be modified in various forms by combining or crossing each other, and such modifications can be regarded as the scope of the present invention. That is, the present invention will be implemented in various different forms within the scope of the appended claims and equivalent technical ideas, and various embodiments of the present invention may be made by those skilled in the art to which the present invention pertains. You will understand.

1: container 2: injection section
1c: outlet 3: dam
A: Upflow reach area d: Injection part inner diameter

Claims (8)

A container in which a melt accommodation space is formed, a melt injection unit is disposed at one side, and a melt discharge port is formed at the other side; And
A dam disposed between the injection part and the discharge port so that one surface thereof directly faces the injection part, the dam being installed at the bottom of the container and connected to both side walls in the longitudinal direction;
The container extends in the longitudinal direction so that the injection portion is disposed on one side thereof and the discharge port is formed on the other side thereof, and one dam is installed therein.
The container includes a rectangular bottom, the longitudinal sidewalls each extending along a long side of the bottom, a width sidewall extending along the short side of the bottom and the other sidewall in width direction, respectively.
The width direction one side wall and the dam are provided at the edge end of the falling region of the melt formed below the injection portion,
The center of the fall region is located between the width side wall and the dam,
The center of the injection unit is aligned in the vertical direction to the center of the falling area,
Wherein said dam has an upper surface height greater than one half of the melt surface height and less than three quarters. delete The method according to claim 1,
The dam is melt processing apparatus that the other surface directly facing the side wall in the width direction of the discharge port side. The method according to claim 1,
The size of the drop zone is proportional to the size of the inner diameter of the injection portion,
And a distance between one side of the dam and the injection portion is proportional to the size of the falling region. The method according to claim 1,
And a distance between the edge end of the drop region and the injection portion is in a range of 2.5 to 5 times the inner diameter of the injection portion. delete The method according to claim 1,
And a through-hole formed in the dam. The method according to claim 7,
The through hole is formed in the lower portion of the dam, is formed in the direction from the one side to the other side, the melt processing apparatus that the inner wall is directly connected to the bottom.

Images