CN217192579U

CN217192579U - Tundish structure of vacuum atomizing furnace for improving flow field

Info

Publication number: CN217192579U
Application number: CN202220418490.7U
Authority: CN
Inventors: 彭春霖; 朱晓雷; 杨骥; 魏崇一; 许孟春; 康伟; 李德军; 杨光; 刘志明; 范思鹏
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-08-16
Anticipated expiration: 2032-02-28

Abstract

The utility model relates to a tundish structure of a vacuum atomizing furnace for improving a flow field, which comprises a tundish and a water gap arranged at the bottom of the tundish; a vertical retaining wall is arranged in the tundish, the retaining wall divides the tundish into 2 areas, and the water gap is positioned at the bottom of the tundish in one area; the retaining wall is provided with a communication hole at one end close to the side wall of the tundish, and the distance between the lower edge of the communication hole and the inner bottom surface of the tundish is H1. The tundish structure can purify the gas atomization metal melt, avoids or reduces the slag and improves the flow field, thereby improving the quality of the finished metal powder.

Description

Tundish structure of vacuum atomizing furnace for improving flow field

Technical Field

The utility model relates to a powder metallurgy technical field especially relates to a vacuum aerosol gasification furnace tundish structure in improvement flow field.

Background

With the development and improvement of powder metallurgy technology, the tundish structure becomes a key link for ensuring the quality of finished products. The quality of the metal powder produced at home at present has a small gap compared with the foreign advanced technology, and mainly the content of impurities in the metal powder is high.

The impurity content of the metal powder directly depends on the cleanliness of molten metal, during the metal smelting process, refractory materials can be dissolved into the molten metal to form impurities, most of the impurities can float up to the surface of the molten metal to form a slag layer, during the atomization process of high-pressure inert gas flow or high-pressure and ultrahigh-pressure water flow, no technical means or measures for controlling and improving the cleanliness of the molten metal are provided, the slag layer on the surface of the molten metal is also atomized at the later stage of atomization, and the finished product quality of the metal powder is seriously influenced.

Disclosure of Invention

The utility model provides an improve vacuum aerosol gasifier tundish structure in flow field can purify gas atomization metal melt, avoids or reduces the lower sediment and improves the flow field to improve finished product metal powder's quality.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a tundish structure of a vacuum aerosol gasifier for improving a flow field comprises a tundish and a water gap arranged at the bottom of the tundish; a vertical retaining wall is arranged in the tundish, the retaining wall divides the tundish into 2 areas, and the water gap is positioned at the bottom of the tundish in one area; the retaining wall is provided with a communicating hole at one end close to the side wall of the tundish, and the distance between the lower edge of the communicating hole and the bottom surface of the inner side of the tundish is H1.

The distance H1 is 30-100 mm.

The tundish is of a cylindrical structure or a cone structure, and the diameter of the top of the cone structure is larger than that of the bottom of the cone structure.

The tundish consists of an outer shell and an inner lining, wherein the outer shell is formed by knotting or firing refractory materials, and the inner lining is formed by knotting the refractory materials or is a refractory material prefabricated part.

The retaining wall is made of an alumina refractory material.

The communicating holes are rectangular holes or parallelogram holes, the top surfaces and the bottom surfaces of the communicating holes are horizontal planes, and the side surfaces of the communicating holes are parallel to the side wall of the tundish; the height of the communicating hole is not less than 1/2 of the inner height of the tundish.

Of the 2 regions partitioned by the retaining wall, the volume of the region on the side where the nozzle is not provided is larger than the volume of the region on the side where the nozzle is provided.

Compared with the prior art, the beneficial effects of the utility model are that:

the defects that the buffer area of the tundish of the traditional vacuum aerosol furnace is narrow, the metal melt is violently overturned during pouring, and the flow field of the metal melt in the tundish is unreasonable are overcome, so that the tundish has the functions of preventing slag atomization and homogenizing the components and temperature of the metal melt, can avoid or reduce slag falling (enabling impurities in the metal melt, namely the slag to be left in the tundish) and improve the flow field, thereby purifying the metal melt and improving the quality of finished metal powder.

Drawings

Fig. 1 is a front sectional view of the tundish of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a view a-a in fig. 1.

In the figure: 1. tundish 11, shell 12, lining 2, water gap 3, retaining wall 31 and communicating hole

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in fig. 1-3, the tundish structure of a vacuum aerosol gasifier for improving a flow field of the present invention comprises a tundish 1 and a nozzle 2 disposed at the bottom of the tundish 1; a vertical retaining wall 3 is arranged in the tundish 1, the retaining wall 3 divides the tundish 1 into 2 areas, and the water gap 2 is positioned at the bottom of the tundish 1 in one area; the retaining wall 3 is provided with a communication hole 31 at one end close to the side wall of the tundish 1, and the distance between the lower edge of the communication hole 31 and the inner bottom surface of the tundish 1 is H1.

The distance H1 is 30-100 mm.

The tundish 1 is of a cylindrical structure or a truncated cone structure, and the diameter of the top of the truncated cone structure is larger than that of the bottom of the truncated cone structure.

The tundish 1 is composed of an outer shell 11 and an inner lining 12, wherein the outer shell 11 is formed by knotting or firing refractory materials, the inner lining 12 is formed by knotting refractory materials, or the inner lining 12 is a refractory material prefabricated part.

The retaining wall 3 is made of an alumina refractory material.

The communicating holes 31 are rectangular holes or parallelogram holes, the top surfaces and the bottom surfaces of the communicating holes 31 are horizontal planes, and the side surfaces of the communicating holes 31 are parallel to the side wall of the tundish 1; the height of the communication hole 31 is not less than 1/2 of the inner height of the tundish 1.

Of the 2 regions partitioned by the retaining wall 3, the volume of the region on the side where the nozzle 2 is not provided is larger than the volume of the region on the side where the nozzle is provided.

According to a traditional tundish for metal melt atomization, a bottom outlet (inlet of a water gap) is flush with the inner bottom surface of the tundish, after metal melt is poured into the tundish, the melt flows out of the water gap and is atomized by high-pressure gas or high-pressure water, and the liquid level of the metal melt in the tundish is gradually reduced along with the atomization process until all the metal melt in the tundish and a slag layer covering the surface of the metal melt all flow out of the water gap and are atomized.

The function principle of tundish structure is as follows:

1. the package is separated into 2 regions by the barricade in the middle of the package, and the regional bottom in one side is equipped with the mouth of a river, and the intercommunicating pore is seted up to the one end of barricade. In the gas atomization process, the metal melt enters the tundish from the area on the side where the nozzle is not provided (hereinafter referred to as an impingement area), and the area on the side where the nozzle is provided corresponds to a buffer area for the metal melt (hereinafter referred to as a buffer area). The metal melt is injected into the tundish from the impact area to cause the rotation of the fluid in the impact area, so that the impact kinetic energy is converted into the rotation potential energy, the impact and the overturning of the metal melt are slowed down, and the condition that the slag is involved in the metal melt is reduced.

2. The asymmetric structure with the hole at one end of the retaining wall is adopted, so that the influence of the earth attraction and the autorotation on the potential vortex generated by the flow of the metal melt at the pouring gate is fully considered, the rotating flow direction of the metal melt in the tundish is opposite to the converging flow direction caused by the earth attraction, and the entrainment effect of the converging negative pressure on the slag is counteracted.

3. After the retaining wall is arranged, the flow field of the metal melt in the tundish rotates and flows in the horizontal direction. If slag is present in the metal melt, separation can be achieved due to the natural separation effect of spiral flow in the horizontal direction (which is disturbed by a downward flow field in a traditional tundish), so that floating of the slag is promoted.

4. After the retaining wall is arranged, the flow field and the temperature field in the tundish are distributed more uniformly.

The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation processes are given, but the scope of the present invention is not limited to the following examples.

[ example 1 ]

In this embodiment, use in 50kg vacuum atomization stove the utility model discloses the pouring basket, the concrete structure and the parameter of pouring basket are as follows:

as shown in fig. 1 to 3, the tundish 1 is of a truncated cone structure, and the outer shell 11 and the inner liner 12 are formed by knotting fused magnesia. The inner diameter of the top of the tundish 1 is 350mm, and the inner diameter of the bottom of the tundish 1 is 250 mm; the middle part is provided with a vertical retaining wall 3, the thickness of the retaining wall 3 is 20mm, and the retaining wall is made of alumina refractory material. The water gap 2 is of a cone structure and is arranged at the bottom of the tundish 1 at one side of the retaining wall 3.

The distance D1 between the center of the retaining wall 3 and the inner side edge of the bottom of the tundish 1 at the side without the water gap 2 is 130 mm; the distance H1 between the bottom edge of the communication hole 31 on the retaining wall 3 and the inner bottom surface of the tundish 1 is 50mm, the height H2 of the communication hole 31 in the vertical direction is 150mm, the distance between the top surface of the communication hole 31 and the top surface of the tundish 1 is H3, and H1+ H2+ H3 is equal to the inner height of the tundish 1; the width D1 of the communication hole 31 is 30 mm.

This embodiment compares with production 65 high-silicon powder, uses the powder total oxygen content of middle package production has reduced more than 55% than the powder total oxygen content that uses conventional middle package production.

[ example 2 ]

In this embodiment, use in 100kg vacuum atomization stove the utility model discloses the pouring basket, the concrete structure and the parameter of pouring basket are as follows:

as shown in fig. 1 to 3, the tundish 1 is of a truncated cone structure, and the outer shell 11 and the inner liner 12 are formed by knotting fused magnesia. The inner diameter of the top of the tundish 1 is 550mm, and the inner diameter of the bottom of the tundish 1 is 350 mm; the middle part is provided with a vertical retaining wall 3, the thickness of the retaining wall 3 is 35mm, and the material is an alumina refractory material. The water gap 2 is of a cone structure and is arranged at the bottom of the tundish 1 at one side of the retaining wall 3.

The distance D1 between the center of the retaining wall 3 and the inner side edge of the bottom of the tundish 1 at the side without the water gap 2 is 200 mm; the distance H1 between the bottom edge of the communication hole 31 on the retaining wall 3 and the inner bottom surface of the tundish 1 is 80mm, the height H2 of the communication hole 31 in the vertical direction is 230mm, the distance between the top surface of the communication hole 31 and the top surface of the tundish 1 is H3, and H1+ H2+ H3 is equal to the inner height of the tundish 1; the width D1 of the communication hole 31 is 35 mm.

This embodiment compares with production high sulphur powder, uses the powder total oxygen content of package production has reduced more than 45% than using the powder total oxygen content of package production in the middle of the conventional.

The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the concept of the present invention within the technical scope disclosed in the present invention.

Claims

1. A tundish structure of a vacuum aerosol gasifier for improving a flow field comprises a tundish and a water gap arranged at the bottom of the tundish; the tundish is characterized in that a vertical retaining wall is arranged in the tundish, the retaining wall divides the tundish into 2 areas, and a water port is positioned at the bottom of the tundish in one area; the retaining wall is provided with a communication hole at one end close to the side wall of the tundish, and the distance between the lower edge of the communication hole and the inner bottom surface of the tundish is H1.

2. The tundish structure of a vacuum atomizing furnace with an improved flow field according to claim 1, wherein the distance H1 is 30-100 mm.

3. The tundish structure of a vacuum atomizing furnace for improving a flow field according to claim 1, wherein the tundish is a cylindrical structure or a truncated cone structure, and the diameter of the top of the truncated cone structure is larger than that of the bottom of the truncated cone structure.

4. The tundish structure of a vacuum atomizing furnace for improving a flow field according to claim 1, wherein the tundish is composed of an outer shell and an inner lining, the outer shell is formed by knotting or firing refractory materials, the inner lining is formed by knotting refractory materials, or the inner lining is a refractory prefabricated member.

5. The tundish structure of a vacuum atomizing furnace for improving flow field according to claim 1, wherein the retaining wall is made of alumina refractory.

6. The tundish structure of a vacuum atomizing furnace for improving the flow field according to claim 1, wherein the communication holes are rectangular holes or parallelogram holes, the top surface and the bottom surface of each communication hole are horizontal planes, and the side surfaces of the communication holes are parallel to the side wall of the tundish; the height of the communicating hole is not less than 1/2 of the inner height of the tundish.

7. The tundish structure of a vacuum atomizing furnace for improving flow field according to claim 1, wherein the volume of the area without nozzle is larger than the volume of the area with nozzle in the 2 areas divided by the retaining wall.