Steel ladle bottom blowing gas medium rapid conversion device

Abstract

The utility model relates to the technical field of refining furnace ladle bottom blowing, in particular to a ladle bottom blowing gas medium quick conversion device which comprises a main pipeline, the main pipeline is communicated with a first pipeline, a first movable joint is arranged at the gas inlet end of the first pipeline, and a first valve is installed on the first pipeline. When a gas medium for bottom blowing of the steel ladle is switched, connection between a gas source of unwanted gas and the main pipeline can be rapidly and thoroughly cut off through the first movable joint, and then a gas source of needed gas is rapidly connected into the main pipeline through the first movable joint; the tail end of the gas conveying pipe of which gas is required is connected with the first movable joint of the first pipeline, so that the required gas is introduced into the main pipeline and the air brick, different types of gas are prevented from being communicated, and different types of gas are prevented from being introduced into the bottom of the steel ladle.

Description

Technical Field

[0001] The utility model relates to the technical field of ladle bottom blowing in a refining furnace, in particular to a ladle bottom blowing gas medium rapid conversion device. Background Art

[0002] Argon blowing from the bottom of the ladle is a simple refining method for degassing molten steel and removing non-metallic inclusions. This method has simple process, cheap equipment and significant refining effect. According to the structure of the molten steel at room temperature (such as austenite, ferrite, etc.) and the purpose of treatment, the gas blown into the molten steel can be argon, nitrogen, carbon monoxide, water vapor, air, or nitrogen, carbon monoxide, water vapor, air, and then argon.

[0003] Argon blowing at the bottom of the ladle is carried out through a special air-permeable brick for the ladle. Its purpose is to make the hydrogen bubbles in the molten steel small and dispersed, so as to slow down the rising speed of the bubbles in the molten steel and improve the purification effect. The principle of argon blowing at the ladle is to blow argon gas of a certain pressure into the bottom of the ladle. The argon gas is transported to the molten steel through the air-permeable bricks for stirring to form bubbles. The bubbles float up due to the buoyancy. During the floating process, the molten steel is drawn and caused to flow from bottom to top in the gas-liquid area. When the bubbles reach the top, they turn horizontally and flow to the ladle wall. After that, they flow back downward near the ladle wall and are drawn to the gas-liquid area again in the middle and lower part of the ladle. In this way, the circulation forms a circulation. Argon stirring is conducive to the chemical reaction between steel and slag. During the circulation process, large particle inclusions and deoxidation products are transferred into the top slag when flowing through the lower area of ​​the top slag, which can accelerate the material transfer between steel and slag and facilitate the deoxidation and desulfurization reactions of the molten steel. The bubbles formed by argon blowing create a relative vacuum in the molten steel, which captures and removes the gas in the steel. At the same time, argon blowing and stirring can make the composition and temperature of the molten steel uniform, making it easier to control the composition.

[0004] At present, in order to save costs, the ladle bottom blowing gas medium is usually two or more. Each gas transmission pipeline is equipped with a flow meter to measure the flow of the gas medium into the ladle bottom. Each gas transmission pipeline has a branch pipeline, and each branch pipeline is respectively connected to the main pipeline leading to the air-permeable brick. A valve is provided on each branch pipeline. The connection between the branch pipeline and the main pipeline is controlled by switching the valve. The gas medium entering the main pipeline is switched by switching different valves. The switching of the gas medium needs to be completed within 3 minutes, otherwise it will cause production interruption. However, in the prior art, in the process of switching the gas medium, the branch pipelines between different gas media may be connected in series, thereby affecting the precise measurement of a single gas medium and also affecting the refining effect. Utility Model Content

[0005] In order to solve the technical problem in the prior art that in the process of switching gas media, the pipelines between different gas media may be connected, affecting the accurate measurement of a single gas medium and affecting the refining effect, the utility model provides a ladle bottom blowing gas medium rapid conversion device.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The beneficial effects of the utility model include:

[0008] A ladle bottom blowing gas medium rapid conversion device comprises a main pipeline, the main pipeline is connected with a first pipeline, the air inlet end of the first pipeline is provided with a first flexible joint, and a first valve is installed on the first pipeline.

[0009] One end of the main pipeline is connected to the air-permeable brick, and the other end is connected to the first pipeline. The air inlet end of the first pipeline is provided with a first flexible joint, and the first flexible joint is flexibly connected to the tail end of the gas supply pipe of the gas source. Taking the switching of nitrogen and argon as an example, when the gas blown at the bottom of the ladle is nitrogen, the first flexible joint is connected to the tail end of the nitrogen gas supply pipe, and the first valve is opened, so that the nitrogen can enter the main pipeline through the first pipeline, and then enter the air-permeable brick at the bottom of the ladle. When it is necessary to switch nitrogen to argon, first close the first valve, then quickly disassemble and separate the first flexible joint from the tail end of the nitrogen gas supply pipe, then quickly plug and connect the first flexible joint to the tail end of the argon gas supply pipe, and finally open the first valve to allow argon to gradually enter the main pipeline and then enter the air-permeable brick at the bottom of the ladle. When argon is switched to nitrogen, the principle is the same and will not be repeated. In this way, when switching the gas medium for blowing the bottom of the ladle, the present application can quickly and completely cut off the connection between the gas source of unnecessary gas and the main pipeline through the first flexible joint, and then quickly connect the gas source of required gas to the main pipeline through the first flexible joint. The tail end of the gas pipe of the required gas is connected to the first flexible joint of the first pipeline, so that the required gas is introduced into the main pipeline and the air-permeable bricks, avoiding the connection between different types of gases and avoiding the introduction of different types of gases into the bottom of the ladle.

[0010] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, the main pipeline is also connected to the second pipeline, the air inlet end of the second pipeline is provided with a second flexible joint, and the second pipeline is installed with a second valve. The second pipeline can be used as an emergency pipeline. When the first pipeline is damaged and it is impossible to ventilate into the main pipeline, in order to avoid production interruption, the second pipeline can be used as an emergency pipeline. The method of using the second pipeline is the same as that of the first pipeline. When the first pipeline is used normally, the second valve should be closed, and when the second pipeline is used in an emergency, the first valve should be closed.

[0011] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, the first valve and the second valve are locked by a valve interlocking device, and the first valve and the second valve are in an interlocking relationship. The first valve and the second valve cannot be opened at the same time, which provides a double guarantee to prevent the second pipeline and the first pipeline from being connected to each other.

[0012] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, the first flexible joint and the second flexible joint are plug-in flexible joints, which can be quickly plugged in and out, thereby improving the switching speed of the gas medium.

[0013] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, the first pipeline and the second pipeline are installed together on the cabinet body of the control cabinet. The overall structure is stable and reliable.

[0014] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, the first pipeline and the second pipeline are arranged in parallel, which facilitates distinguishing the first pipeline and the second pipeline and reduces the linear distance between the first pipeline and the second pipeline.

[0015] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, a rapid shut-off valve is connected to the main pipeline, which can cut off the gas in an emergency and improve the safety of ladle bottom blowing.

[0016] As a preferred implementation scheme of a ladle bottom blowing gas medium rapid conversion device, a pressure relief valve is connected to the main pipeline to avoid excessive gas pressure in the main pipeline and improve the safety of ladle bottom blowing.

[0017] The beneficial effects of the utility model are:

[0018] When switching the gas medium for blowing the bottom of the ladle, the present application can quickly and completely cut off the connection between the gas source of unnecessary gas and the main pipeline through the first flexible joint, and then quickly connect the gas source of required gas to the main pipeline through the first flexible joint. The tail end of the gas pipe of the required gas is connected to the first flexible joint of the first pipeline, so that the required gas is introduced into the main pipeline and the air-permeable bricks, avoiding the connection between different types of gases and avoiding the introduction of different types of gases into the bottom of the ladle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a structural schematic diagram of a ladle bottom blowing gas medium rapid conversion device in a specific implementation manner of the utility model.

[0021] List of parts and reference numerals:

[0022] 1. Main pipeline; 2. First pipeline; 3. Second pipeline; 4. First valve; 5. Second valve; 6. Control cabinet. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0024] Reference Figure 1 The present embodiment proposes a ladle bottom blowing gas medium rapid conversion device, which includes a main pipeline 1, a quick shut-off valve is connected to the main pipeline 1, a pressure relief valve is connected to the main pipeline 1, the main pipeline 1 is respectively connected to the first pipeline 2 and the second pipeline 3, the second pipeline 3 is an emergency pipeline, when the first pipeline 2 is damaged, the second pipeline 3 can replace the first pipeline 2 to ventilate the main pipeline 1 and the ladle bottom air brick, the first pipeline 2 and the second pipeline 3 are installed on the cabinet of the control cabinet 6, the first pipeline 2 and the second pipeline 3 are arranged in parallel, the air inlet end of the first pipeline 2 is provided with a first flexible joint, the first pipeline 2 is installed with a first valve 4, the air inlet end of the second pipeline 3 is provided with a second flexible joint, the first flexible joint and the second flexible joint are plug-in flexible joints, the second pipeline 3 is installed with a second valve 5, the first valve 4 and the second valve 5 are valve interlocking device locks, the first valve 4 and the second valve 5 are in an interlocking relationship, and the first valve 4 and the second valve 5 cannot be opened at the same time.

[0025] The working principle of this embodiment is as follows: taking the switching between nitrogen and argon as an example, the first flexible joint is connected to the tail end of the nitrogen gas pipeline, and the first valve 4 is opened, so that the nitrogen can enter the main pipeline 1 through the first pipeline 2, and then enter the air-permeable brick at the bottom of the ladle. When it is necessary to switch nitrogen to argon, first close the first valve 4, then quickly disassemble and separate the first flexible joint from the tail end of the nitrogen gas pipeline, then quickly plug and connect the first flexible joint to the tail end of the argon gas pipeline, and finally open the first valve 4 to allow argon to gradually enter the main pipeline 1, and then enter the air-permeable brick at the bottom of the ladle. When argon is switched to nitrogen, the principle is the same and will not be repeated.

[0026] In this embodiment, nitrogen and argon are used as examples. In actual use, other gas media, such as carbon monoxide, water vapor, air, etc., can also be quickly switched.

[0027] In this way, when switching the gas medium for bottom blowing of the ladle, this embodiment can quickly and completely cut off the connection between the gas source of the unnecessary gas and the main pipeline through the first flexible joint, and then quickly connect the gas source of the required gas to the main pipeline 1 through the first flexible joint. The tail end of the gas pipeline of the required gas is connected to the first flexible joint of the first pipeline 2, so that the required gas is introduced into the main pipeline 1 and the air-permeable brick to avoid the connection between different types of gases and avoid the connection between different types of gases at the bottom of the ladle. This embodiment can quickly switch between a variety of gas media, and the multiple gas media will not be connected. This embodiment also provides an interlocking first valve 4 and a second valve 5 to provide a double guarantee to prevent the second pipeline 3 and the first pipeline 2 from being connected to each other.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ladle bottom blowing gas medium rapid conversion device, comprising a main pipeline (1), the main pipeline (1) being connected to a first pipeline (2), characterized in that: A first flexible joint is provided at the air inlet end of the first pipeline (2), and a first valve (4) is installed on the first pipeline (2); The main pipeline (1) is also connected to the second pipeline (3); a second flexible joint is provided at the air inlet end of the second pipeline (3); and a second valve (5) is installed on the second pipeline (3); The first valve (4) and the second valve (5) are locked by a valve interlocking device, and the first valve (4) and the second valve (5) are in an interlocking relationship.

2. The ladle bottom blowing gas medium rapid conversion device according to claim 1 is characterized in that: The first flexible joint and the second flexible joint are plug-in type flexible joints.

3. The ladle bottom blowing gas medium rapid conversion device according to claim 1, characterized in that: The first pipeline (2) and the second pipeline (3) are installed together on a cabinet body of a control cabinet (6).

4. The ladle bottom blowing gas medium rapid conversion device according to claim 1, characterized in that: The first pipeline (2) and the second pipeline (3) are arranged in parallel.

5. The ladle bottom blowing gas medium rapid conversion device according to claim 1, characterized in that: A quick shut-off valve is connected to the main pipeline (1).

6. The ladle bottom blowing gas medium rapid conversion device according to claim 1, characterized in that: A pressure relief valve is connected to the main pipeline (1).

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