8-shaped dip pipe and use method thereof

Abstract

The invention relates to the technical field of metal smelting, and provides an 8-shaped dip pipe and a using method thereof. The 8-shaped dip pipe comprises an ascending pipe and a descending pipe which are communicated with a bottom plate of a vacuum tank; the first partition plate is located between the ascending pipe and the descending pipe, the first partition plate is provided with a first feeding port and a first spraying pipeline, and the first feeding port is communicated with the ascending pipe; the second partition plate is provided with a second feeding hole and a second spraying pipeline; the material mixing channel is located between the first partition plate and the second partition plate, an outlet of the second material spraying pipeline and an outlet of the first material spraying pipeline are both communicated with the material mixing channel, and the material mixing channel is communicated with the downcomer; the first material spraying pipeline and the second material spraying pipeline are both communicated with air supply pipes. By means of the technical scheme, the problem that internal gas is not prone to escaping when liquid flowing circularly is located at the bottom in the vacuum tank is solved.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to an 8-shaped immersion pipe and a use method thereof. Background Art

[0002] The RH vacuum furnace includes a vacuum tank, an ascending pipe, a downcomer, a ladle and a gas supply system, etc., which allow the liquid in the ladle to circulate for degassing and refining.

[0003] In the prior art, the circulation flow of the liquid is generally increased by increasing the gas supply flow of argon gas, increasing the diameter of the riser and downcomer, etc., and the number of liquid circulation flows is reduced, thereby improving the refining efficiency. However, there is an upper limit to the increase in the circulation flow, and due to the limitations of existing equipment and space capacity in the factory, the refining efficiency can no longer be effectively improved. When the liquid raw material in the ladle circulates, gas escape and some chemical reactions are mainly completed at the bottom of the vacuum tank. If the liquid residence time is short, the escape amount and reaction amount are greatly reduced. Therefore, during the circulation process, the residence time of the liquid at the bottom of the vacuum tank and the flow form have a great influence on the refining efficiency.

[0004] In the prior art, the problem that the circulating liquid has a short residence time at the bottom of the vacuum tank and the internal gas has a slow escape efficiency needs to be solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an 8-shaped immersion tube and a method for using the same in view of the above-mentioned technical deficiencies, which solves the problem in the prior art that internal gas is not easy to escape when the circulating liquid is at the bottom of the vacuum tank.

[0006] The technical solution adopted by the present invention is: to provide an 8-shaped immersion pipe, comprising an ascending pipe and a descending pipe connected to the bottom plate of the vacuum tank, wherein a connecting wall is provided between the ascending pipe and the descending pipe; and characterized in that it also comprises:

[0007] A first baffle, disposed at the upper end of the bottom plate and located between the ascending pipe and the descending pipe, the first baffle having a first feed port and a first spraying pipe, the first spraying pipe being connected to the first feed port, and the first feed port being connected to the ascending pipe;

[0008] A second baffle is disposed at the upper end of the bottom plate and is located between the ascending pipe and the descending pipe, the second baffle has a second feed port and a second spraying pipe, the second spraying pipe is connected to the second feed port, and the second feed port is connected to the ascending pipe;

[0009] A mixing channel is located between the first baffle and the second baffle, the outlet of the second spraying pipe and the outlet of the first spraying pipe are both connected to the mixing channel, and the mixing channel is connected to the downcomer;

[0010] There are a plurality of air supply pipes, the first material spraying pipe and the second material spraying pipe are both connected to the air supply pipes, and the air supply pipes supply air to the first material spraying pipe and the second material spraying pipe respectively;

[0011] A portion of the liquid above the ascending tube passes through the first feed port, the first spraying pipe and the mixing channel in sequence and then enters the downcomer, and a portion of the liquid above the ascending tube passes through the second feed port, the second spraying pipe and the mixing channel in sequence and then enters the downcomer.

[0012] To further optimize the technical solution, the upper end of the first baffle is higher than the liquid level above the riser, the second spray pipe and the first spray pipe are both inclined, and the outlet of the second spray pipe and the outlet of the first spray pipe are relatively arranged and are both higher than the liquid level at the mixing channel.

[0013] To further optimize the technical solution, there are a plurality of the first spraying pipes and a plurality of the second spraying pipes, and the outlets of the second spraying pipes are opposite to the outlets of the first spraying pipes one by one.

[0014] To further optimize the technical solution, the vacuum groove has a first side wall and a second side wall on the front and rear sides respectively, the front end of the first partition plate abuts against the first side wall, and there is a gap between the rear end of the first partition plate and the second side wall; the rear end of the second partition plate abuts against the second side wall, and there is a gap between the front end of the second partition plate and the first side wall; the rear end of the first partition plate is connected to the second partition through a baffle, and the mixing channel is formed between the first partition plate, the baffle plate and the second partition.

[0015] To further optimize the technical solution, the first partition plate and the second partition plate are both inserted and arranged at the bottom of the vacuum tank.

[0016] A method for using an 8-shaped dip tube is also proposed, and refining is performed using the 8-shaped dip tube, comprising the following steps:

[0017] Step 1: After the ascending pipe and the descending pipe enter the ladle below, the vacuum tank is in a negative pressure state, and driving gas is introduced into the ascending pipe, and the liquid in the ladle enters the bottom of the vacuum tank from the ascending pipe and is located above the ascending pipe;

[0018] Step 2: A portion of the liquid above the riser enters the first spraying pipe through the first feed port, and a portion enters the second spraying pipe through the second feed port. The air supply pipe supplies air to the first spraying pipe and the second spraying pipe respectively, and the liquid in the first spraying pipe and the second spraying pipe is sprayed from the outlet into the mixing channel, and the liquid scatters into the mixing channel in the form of water droplets;

[0019] Step 3: The liquid in the mixing channel is mixed and gathered and flows to the downcomer and then flows back to the ladle. The beneficial effects of the present invention are:

[0020] 1. After the liquid enters the vacuum tank through the riser, it is ejected through the first and second spray pipes under the thrust of the bubbles ejected from the air supply pipe, and is ejected from the outlets of the first and second spray pipes and the bubbles are broken, so that the liquid can be sprayed and dispersed, the surface area is increased, and the distinction between the upper and lower layers of the liquid is reduced, which is beneficial to increasing the escape amount and escape efficiency of the gas in the liquid. At the same time, if oxygen and other substances are added in the vacuum tank to carry out chemical reactions to refine the liquid, it is beneficial to improve the reaction efficiency.

[0021] 2. Compared with the liquid flowing directly from the top of the riser to the downcomer, the liquid after spraying flows to the downcomer through the mixing channel, and the flow path of the liquid inside the vacuum tank is extended, thereby extending the residence time.

[0022] 3. When the gas supply pipe supplies gas to the first spray pipe and the second spray pipe, bubbles can be formed inside to push the liquid to spray out in sections, with good spraying effect, and the liquid has a good raindrop-like scattering effect, which greatly increases the surface area. The gas supplied by the gas supply pipe can be a driving gas or a refining reaction gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the bottom structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the present invention viewed from above;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at the AA position;

[0027] Figure 5 For the present invention Figure 4 A schematic diagram of the local enlarged structure at point a in the middle;

[0028] Figure 6 It is a schematic diagram of the structure of the first partition and the second partition of the present invention;

[0029] Figure 7 For the present invention Figure 6 A schematic diagram of the structure from the other side of the perspective;

[0030] Figure 8 For the present invention Figure 7 State plane structure diagram;

[0031] Fig. 9 For the present invention Figure 8 Schematic diagram of the cross-sectional structure at the middle BB position;

[0032] Fig.10 It is a schematic diagram of the first baffle structure of the present invention;

[0033] Markings in the figure are as follows: 1. Vacuum tank; 101. Bottom plate; 102. Riser; 103. Downcomer; 104. Connecting wall; 105. First side wall; 106. Second side wall; 2. First partition; 201. First feed port; 202. First spraying pipe; 2021. Outlet; 3. Second partition; 301. Second feed port; 302. Second spraying pipe; 4. Mixing channel; 5. Air supply pipe; 6. Baffle. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0036] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] like Figure 1-10As shown, an 8-shaped impregnation pipe includes an ascending pipe 102 and a descending pipe 103 connected to the bottom plate 101 of the vacuum tank 1, and a connecting wall 104 is provided between the ascending pipe 102 and the descending pipe 103; and further includes: a first partition plate 2, which is arranged at the upper end of the bottom plate 101 and is located between the ascending pipe 102 and the descending pipe 103, and the first partition plate 2 has a first feed port 201 and a first spraying pipe 202, and the first spraying pipe 202 is connected to the first feed port 201, and the first feed port 201 is connected to the ascending pipe 102; a second partition plate 3, which is arranged at the upper end of the bottom plate 101 and is located between the ascending pipe 102 and the descending pipe 103, and the second partition plate 3 has a second feed port 301 and a second spraying pipe 302, and the second spraying pipe 302 is connected to the second feed port 301, and the second feed port 301 and the ascending pipe 102 is connected; the mixing channel 4 is located between the first baffle 2 and the second baffle 3, the outlet 2021 of the second spraying pipe 302 and the outlet 2021 of the first spraying pipe 202 are both connected to the mixing channel 4, and the mixing channel 4 is connected to the downcomer 103; there are several air supply pipes 5, the first spraying pipe 202 and the second spraying pipe 302 are both connected to the air supply pipe 5, and the air supply pipe 5 supplies air to the first spraying pipe 202 and the second spraying pipe 302 respectively; a part of the liquid above the ascending pipe 102 passes through the first feed port 201, the first spraying pipe 202 and the mixing channel 4 in sequence and then enters the downcomer 103, and a part of the liquid above the ascending pipe 102 passes through the second feed port 301, the second spraying pipe 302 and the mixing channel 4 in sequence and then enters the downcomer 103. The upper end of the first baffle 2 is higher than the liquid level above the riser 102, the second spraying pipe 302 and the first spraying pipe 202 are both inclined, the outlet 2021 of the second spraying pipe 302 and the outlet 2021 of the first spraying pipe 202 are oppositely arranged and both are higher than the liquid level at the mixing channel 4. The first spraying pipe 202 and the second spraying pipe 302 each have a plurality of outlets, and the outlets 2021 of the second spraying pipe 302 and the outlets 2021 of the first spraying pipe 202 are opposite one by one.

[0039] The first feed port 201 is connected to the ascending pipe 102, the second feed port 301 is connected to the ascending pipe 102, and the mixing channel 4 is connected to the descending pipe 103. The communication refers to the communication at the horizontal height or through an independent channel. The liquid can flow in a certain flow direction in the two connected channels in a circulating flow state. The bottom plate 101 is located at the bottom end of the vacuum tank 1. The vacuum tank 1, the ascending pipe 102 and the descending pipe 103 are all existing structures.

[0040] When in use, in the first partition 2, the first feed port 201 can be located at the front side, and a plurality of first spray pipes 202 are spaced apart in the first partition 2 along the front-to-back direction, which can extend the flow path of a portion of the liquid entering the first spray pipe 202 at the rear side. Of course, a long strip opening can be opened along the front-to-back direction on the left side of the first partition 2 as the first feed port 201, and each first spray pipe 202 is connected to the first feed port 201 and is connected with an air supply pipe 5, and the air outlet end of the air supply pipe 5 can be located below the liquid level in the first spray pipe 202 under static conditions. The second partition 3 has a similar structure to the first partition 2, and the second feed port 301 can be located at the rear side, and a plurality of second spray pipes 302 are spaced apart in the second partition 3 along the front-to-back direction, and each second spray pipe 302 is connected with an air supply pipe 5.

[0041] The gas supply pipe 5 is connected to an external gas supply device, and the gas supply device can provide different gases according to demand. The gas supply pipe 5 can be an independent pipe structure, which can pass through the bottom plate 101 or the connecting wall 104 to communicate with the outside. The gas supply pipe 5 can also be composed of an internal channel structure in the partition, and a gas pipeline can be arranged inside the connecting wall 104 to connect with the internal channel of the partition (gas supply pipe 5) to achieve communication with the external gas supply device.

[0042] The vacuum tank 1 is in a negative pressure state. The liquid enters the lower part of the vacuum tank 1 through the riser 102 and is located above the riser 102. Then, part of the liquid flows into each first spraying pipe 202 through the first feed port 201, and part of the liquid flows into each second spraying pipe 302 through the second feed port 301. The gas supply pipe 5 starts to supply gas, and bubbles are intermittently formed in the first spraying pipe 202 and the second spraying pipe 302 by increasing the gas supply amount and rate and controlling the gas supply cycle. The liquid in the spraying pipe is also segmented. Under the drive of the gas, segments of liquid are continuously sprayed from the first spraying pipe and the second spraying pipe, and after spraying, they can be scattered in the shape of water droplets. The first partition 2 and the second partition 3 are arranged opposite to each other, with a mixing channel 4 in the middle. The liquid sprayed from both sides of the mixing channel 4 can be further dispersed in the middle by liquid collision, which is conducive to releasing the gas and bubbles inside the liquid. After the liquid falls into the mixing channel 4, it flows to the downcomer 103.

[0043] The first partition 2 and the second partition 3 can separate the ascending tube 102 and the descending tube 103 on the bottom plate 101, and the liquid level above the ascending tube 102 is lower than the first partition 2 and the second partition 3, so that the liquid above the ascending tube 102 can only be sprayed out through the first spraying pipe 202 and the second spraying pipe 302. Alternatively, the liquid level above the ascending tube 102 can be slightly higher than the upper end of the first partition 2, most of the liquid flows in the form of spraying, and part of the liquid directly flows over the first partition 2 into the mixing channel 4; or the mixing channel 4 is connected to the ascending tube 102, and part of the liquid flows directly from the ascending tube 102 to the descending tube 103 through the mixing channel 4.

[0044] The second spray pipe 302 and the first spray pipe 202 are both inclined, which is conducive to the two spraying liquid to the middle high position. The outlet 2021 is higher than the liquid level at the mixing channel 4, which is conducive to the sprayed liquid forming a raindrop dispersion state, avoiding the sprayed liquid being blocked by the liquid surface and only forming bubbles at the liquid surface.

[0045] The outlet 2021 of the second spraying pipe 302 is opposite to the outlet 2021 of the first spraying pipe 202, which is beneficial for the liquid sprayed from both sides to collide, enhance the dispersion state, and enhance the escape efficiency of gas and bubbles.

[0046] like Figure 5 As shown, the feed port and the spray pipe can be completely located inside the partition, such as the state shown by the second partition 3, with the lower end in a sealed state; or the state shown by the first partition 2, with the lower end being open, and the bottom plate 101 is blocked by the first partition 2 after being fixed on the bottom plate 101, which is conducive to the first feed port 201 to communicate at a low position, avoiding the appearance of steps blocking the liquid. Of course, a slot can be set on the bottom plate 101, and the second partition 3 is inserted into the slot, and the second feed port 301 can also achieve low-level communication.

[0047] Furthermore, the vacuum tank 1 has a first side wall 105 and a second side wall 106 on the front and rear sides respectively; the front end of the first partition plate 2 abuts against the first side wall 105, and there is a gap between the rear end of the first partition plate 2 and the second side wall 106; the rear end of the second partition plate 3 abuts against the second side wall 106, and there is a gap between the front end of the second partition plate 3 and the first side wall 105; the rear end of the first partition plate 2 is connected to the second partition plate 3 through the baffle plate 6, and a mixing channel 4 is formed between the first partition plate 2, the baffle plate 6 and the second partition plate 3.

[0048] When in use, the first baffle 2 and the second baffle 3 can be installed in the structure shown in the figure, and the two can be arranged in parallel and spaced apart, and a semi-enclosed mixing channel 4 is formed by the baffle 6. The mixing channel 4 is not horizontally connected to the top of the riser 102. The mixing channel 4 is horizontally connected to the top of the downcomer 103 through the interval between the second baffle 3 and the first side wall 105.

[0049] Furthermore, the first partition plate 2 and the second partition plate 3 are both inserted and arranged at the bottom of the vacuum tank 1 .

[0050] When in use, the first partition plate 2 and the second partition plate 3 can be detachably installed on the bottom plate 101 in the form of plug-in, which is convenient for individual maintenance and replacement and easy to install.

[0051] A method for using the figure-8 dip tube is also proposed. Refining is performed using the figure-8 dip tube, comprising the following steps:

[0052] Step 1: After the riser 102 and the downcomer 103 enter the ladle below, the vacuum tank 1 is in a negative pressure state, and the driving gas is introduced into the riser 102. The liquid in the ladle enters the bottom of the vacuum tank 1 from the riser 102 and is located above the riser 102;

[0053] Step 2: A portion of the liquid above the riser 102 enters the first spraying pipe 202 through the first feed port 201, and a portion enters the second spraying pipe 302 through the second feed port 301. The air supply pipe 5 supplies air to the first spraying pipe 202 and the second spraying pipe 302 respectively, and the liquid in the first spraying pipe 202 and the second spraying pipe 302 is sprayed from the outlet 2021 into the mixing channel 4. The liquid scatters into the mixing channel 4 in the shape of water droplets.

[0054] Step 3: The liquid in the mixing channel 4 is mixed and gathered, then flows to the downcomer 103 and flows back to the ladle.

[0055] When in use, the gas supply pipe 5 can supply gas intermittently or continuously when supplying gas to the injection pipe. The riser 102 and the downcomer 103 are connected by the wall 104 to form an "8"-shaped structure, which enhances the structural strength and eliminates the gap, which is beneficial to reduce the impact of slag when entering the ladle.

[0056] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An 8-shaped immersion pipe, comprising an ascending pipe (102) and a descending pipe (103) connected to a bottom plate (101) of a vacuum tank (1), wherein a connecting wall (104) is provided between the ascending pipe (102) and the descending pipe (103); characterized in that: Also includes: a first baffle (2), arranged at the upper end of the bottom plate (101) and located between the ascending pipe (102) and the descending pipe (103); the first baffle (2) having a first feed port (201) and a first spraying pipe (202); the first spraying pipe (202) and the first feed port (201) being in communication with each other; and the first feed port (201) being in communication with the ascending pipe (102); a second baffle (3) arranged at the upper end of the bottom plate (101) and located between the ascending pipe (102) and the descending pipe (103); the second baffle (3) having a second feed port (301) and a second spraying pipe (302); the second spraying pipe (302) and the second feed port (301) are in communication; and the second feed port (301) and the ascending pipe (102) are in communication; a mixing channel (4), located between the first baffle (2) and the second baffle (3); an outlet (2021) of the second spraying pipe (302) and an outlet (2021) of the first spraying pipe (202) are both in communication with the mixing channel (4); and the mixing channel (4) is in communication with the downcomer (103); There are a plurality of air supply pipes (5), wherein the first material spraying pipe (202) and the second material spraying pipe (302) are both connected to the air supply pipe (5), and the air supply pipe (5) supplies air to the first material spraying pipe (202) and the second material spraying pipe (302) respectively; A portion of the liquid above the ascending pipe (102) passes through the first feed port (201), the first spraying pipe (202) and the mixing channel (4) in sequence before entering the descending pipe (103), and a portion of the liquid above the ascending pipe (102) passes through the second feed port (301), the second spraying pipe (302) and the mixing channel (4) in sequence before entering the descending pipe (103).

2. The 8-shaped immersion pipe according to claim 1, characterized in that: The upper end of the first baffle (2) is higher than the liquid level above the riser (102); the second spraying pipe (302) and the first spraying pipe (202) are both arranged at an angle; the outlet (2021) of the second spraying pipe (302) and the outlet (2021) of the first spraying pipe (202) are arranged opposite to each other and are both higher than the liquid level at the mixing channel (4).

3. The 8-shaped immersion pipe according to claim 2, characterized in that: The first material spraying pipe (202) and the second material spraying pipe (302) are both in plurality, and the outlets (2021) of the second material spraying pipe (302) are opposite to the outlets (2021) of the first material spraying pipe (202) one by one.

4. The 8-shaped immersion pipe according to claim 1, characterized in that: The vacuum tank (1) has a first side wall (105) and a second side wall (106) on the front and rear sides respectively; the front end of the first partition plate (2) abuts against the first side wall (105), and a gap is formed between the rear end of the first partition plate (2) and the second side wall (106); the rear end of the second partition plate (3) abuts against the second side wall (106), and a gap is formed between the front end of the second partition plate (3) and the first side wall (105); the rear end of the first partition plate (2) and the second partition plate (3) are connected via a baffle plate (6), and the mixing channel (4) is formed between the first partition plate (2), the baffle plate (6) and the second partition plate (3).

5. The 8-shaped immersion pipe according to claim 1, characterized in that: The first partition plate (2) and the second partition plate (3) are both inserted and arranged at the bottom of the vacuum tank (1).

6. A method for using an 8-shaped dip tube, using the 8-shaped dip tube according to any one of claims 1 to 5 for refining, characterized in that: The steps include: Step 1: After the ascending pipe (102) and the descending pipe (103) enter the ladle below, the vacuum tank (1) is in a negative pressure state, a driving gas is introduced into the ascending pipe (102), and the liquid in the ladle enters the bottom of the vacuum tank (1) from the ascending pipe (102) and is located above the ascending pipe (102); Step 2: a portion of the liquid above the rising pipe (102) enters the first spraying pipe (202) through the first feed port (201), and a portion of the liquid enters the second spraying pipe (302) through the second feed port (301), and the air supply pipe (5) supplies air to the first spraying pipe (202) and the second spraying pipe (302) respectively, so that the liquid in the first spraying pipe (202) and the second spraying pipe (302) is sprayed from the outlet (2021) into the mixing channel (4), and the liquid scatters into the mixing channel (4) in the form of water droplets; Step 3: The liquid in the mixing channel (4) is mixed and gathered, then flows to the downcomer (103) and flows back to the ladle.

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