Converter throwing type nitrogen feeding device
Through the design of the air injection warehouse and ring -shaped pores in the roll -up of nitrogen throwing, nitrogen can fully enter the steel water, solve the problem of difficulty entering steel water in the existing technology, and improve the quality of steel and reduce production costs.
Patent Information
- Application Number
- CN202420440697.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-03-07
AI Technical Summary
In the prior art, it is difficult for the input of nitrogen to fully enter the molten steel, which makes it difficult for the molten steel to fully mix nitrogen, and thus it is difficult to play a predictive role.
There is a type of turning furnace throwing nitrogen throttle device, including the transit body, the gas pipe injection, and the air injection bin. The outer side of the injection warehouse is opened with a hole in a ring array. The limit is located in the transition furnace body through the limit block, so that the nitrogen can be discharged from the gap between the bottom of the air injection warehouse and the bottom of the inside of the turntable body to fully enter the steel water.
The full mixing of nitrogen with steel water is achieved, the quality of steel is improved, the content of impurities in steel water is reduced, and the purpose of improving steel quality and reducing production costs is achieved.
Smart Images
Figure CN222411664U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel smelting, in particular to a drop-type nitrogen injection device for a converter. Background Art
[0002] Bottom blowing nitrogen means injecting high-pressure nitrogen into the converter through the orifice at the bottom of the converter. After the action of the charge and slag, the nitrogen will react with oxygen, carbon and other elements in the molten steel, thus playing the following roles: Bottom blowing nitrogen can increase the temperature of the molten steel, promote the dissolution of carbon, increase the solubility and diffusion rate, reduce the carbon load, and improve the quality of steel. At the same time, bottom blowing nitrogen can also accelerate the reaction rate between molten steel and slag, thereby reducing the content of iron oxide in the slag, reducing the process of slag desulfurization, and further increasing the output of steel. During steelmaking, nitrogen bubbles invade the molten steel, which can accelerate the turbidity and homogenization of the molten steel, making it easier for impurities and gases to escape from the steel. At the same time, bottom blowing nitrogen can also strengthen the flow, make the temperature distribution inside and outside the molten steel uniform, reduce the crystallization and separation of the molten steel, and improve the purity and uniformity of the steel. Bottom blowing nitrogen can form a protective atmosphere to separate the lining from the molten steel, prevent the molten steel from invading the cracks of the lining, reduce the wear of the lining, and thus increase the life of the lining. Bottom blowing nitrogen has been widely used in the traditional converter steelmaking process. At present, many large steel mills at home and abroad adopt bottom blowing nitrogen technology, such as Anshan Iron and Steel, Shagang, Baosteel, etc. Especially in low temperature and ultra-low temperature steelmaking, the role of bottom blowing nitrogen is more obvious. This is because in low temperature and ultra-low temperature steelmaking, the viscosity of molten steel is relatively large, and it is difficult to make oxygen and slag fully contact. Bottom blowing nitrogen can improve the bubble structure, so that oxygen and slag are more fully contacted, thereby accelerating the reduction and decomposition of metal oxides. In short, bottom blowing nitrogen is a very important technical means. It can effectively improve the quality and output of converter steelmaking and reduce production costs. It is an essential technology for today's steelmaking industry.
[0003] Chinese utility model patent: Publication number CN207143282U discloses a converter that is resistant to slag splashing. At least one circle of compressed gas main pipe is provided on the outer wall of the converter. Compressed gas branch pipes are distributed along the compressed gas main pipe. The outlet of the compressed gas branch pipe is connected to a refractory nozzle brick. The refractory nozzle bricks are evenly distributed around the axis of the converter and the outlet is located inside the converter. The compressed gas main pipe is connected to a compressed gas source. A valve is provided on the compressed gas pipeline consisting of the compressed gas source, the compressed gas main pipe and the compressed gas branch pipe.
[0004] In the prior art, when CN207143282U is in use, when the oxygen lance descends to the blowing position for blowing, the valve is opened, and the refractory nozzle bricks blow compressed gas above the surface of the foam slag in the converter, which can prevent the converter slag from splashing, reduce the loss of steel materials, reduce production costs, reduce slag sticking to the furnace mouth and furnace cap, avoid the negative torque of the converter, and ensure the safe and normal smelting of the converter. When the oxygen lance stops blowing, the valve is closed and the blowing of compressed gas is stopped.
[0005] However, when performing nitrogen dosing, since the steel melt seal is greater than the nitrogen density, it is difficult for nitrogen to fully enter the steel melt, which makes it difficult for the steel melt to fully mix with nitrogen, making it difficult for the nitrogen dosing to have the expected effect. Therefore, a converter drop-type nitrogen dosing device is needed to solve the above problems. Utility Model Content
[0006] The utility model aims to provide a converter drop-type nitrogen injection device, which has the advantage of fully mixing nitrogen with molten steel and solves the problem that the nitrogen injected in the prior art device is difficult to enter the molten steel when in use.
[0007] To achieve the above object, the utility model provides the following technical solutions: a converter drop-type nitrogen injection device, comprising a converter body, a gas injection pipe is movably inserted in an upper hole on one side of the converter body, and also includes a gas injection bin;
[0008] The gas injection bin is connected to the bottom end of the gas injection pipe installed inside the converter body;
[0009] Among them, through holes are opened in a circular array on the outer side of the bottom of the gas injection bin.
[0010] When using a converter throwing-type nitrogen injection device in the technical solution, the converter body is movably installed through the mounting frame, and the nitrogen pipeline is connected and installed with the connecting pipe on the sealing valve, and the raw material is injected into the converter body through the feeding pipe. After the raw material is melted in the converter body, the sealing valve is opened to allow nitrogen to be directly injected into the converter body through the gas injection pipe. Since the bottom of the gas injection bin is limited in the converter body by the limiting block, the nitrogen that enters the gas injection bin through the gas injection pipe can be discharged from the gap between the bottom of the gas injection bin and the bottom of the inner side of the converter body, so that the nitrogen can fully enter the molten steel, thereby achieving the purpose of improving the quality of steel and reducing impurities in the molten steel.
[0011] Preferably, the top of the converter body is open and connected to a feed pipe, the other side of the converter body is opened and connected to a discharge pipe, mounting frames are rotatably installed on both the front and rear sides of the converter body, and a limit block is fixedly installed in the middle of the bottom inner side of the converter body.
[0012] By opening the top of the converter body and connecting it with a feed pipe, raw materials can be added into the converter body through the feed pipe. At the same time, a hole is opened on the other side of the converter body and connected with a discharge pipe, so that molten steel can be discharged through the discharge pipe after steelmaking is completed. At the same time, mounting frames are rotatably installed on both the front and rear sides of the converter body, so that the converter body can be rotated through the mounting frames.
[0013] Preferably, the top of the gas injection pipe passes through the converter body and is fixedly provided with a sealing valve.
[0014] By passing the top of the gas injection pipe through the converter body and fixing a sealing valve thereon, the inside of the gas injection pipe inside the converter body can be relatively sealed after the sealing valve is closed, and the backflow of molten steel can be prevented under the action of gas pressure. At the same time, nitrogen can be injected into the molten steel in the converter body through the gas injection pipe after the sealing valve is opened.
[0015] Preferably, a connecting pipe is provided at one end of the sealing valve away from the gas injection pipe, and the sealing valve adopts a manual ball valve structure design.
[0016] A connecting pipe is provided at the end of the sealing valve away from the gas injection pipe, so that the sealing valve can be connected and installed with the nitrogen pipeline through the connecting pipe. At the same time, the sealing valve adopts a manual ball valve structure design, so as to avoid significant damage to the sealing valve due to high temperature during use.
[0017] Preferably, a limiting groove is provided in the middle of the bottom of the gas injection bin, the size of the limiting groove matches the size of the limiting block, and the bottom of the gas injection bin contacts the bottom of the inner wall of the converter body but is not fixedly connected.
[0018] By opening a limiting groove in the middle of the bottom of the gas injection bin and matching the size of the limiting groove with the size of the limiting block, the gas injection bin can be positioned and installed at the bottom inner side of the converter body through the limiting block. At the same time, the bottom of the gas injection bin is in contact with the bottom of the inner wall of the converter body but not fixedly connected, thereby preventing molten steel from entering the gas injection bin, so that a relatively sealed environment can be created inside the gas injection pipe.
[0019] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0020] The utility model provides a gas injection bin, and at the same time, connects the gas injection bin to the bottom end of the gas injection pipe installed on the inner side of the converter body, and a through hole is opened on the outer side of the bottom of the gas injection bin in a ring array, so that when in use, the converter body is movably installed through the mounting frame, and the nitrogen pipeline is connected and installed with the connecting pipe on the sealing valve, and raw materials are injected into the converter body through the feeding pipe, and after the raw materials are melted in the converter body, the sealing valve is opened, so that nitrogen is directly injected into the converter body through the gas injection pipe, and because the bottom of the gas injection bin is limited in the converter body by the limiting block, the nitrogen entering the gas injection bin through the gas injection pipe can be discharged from the gap between the bottom of the gas injection bin and the bottom of the inner side of the converter body, so that the nitrogen can fully enter the molten steel, thereby achieving the purpose of improving the quality of steel and reducing impurities in the molten steel, and achieving the effect of fully mixing the nitrogen with the molten steel. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the main structure of the utility model;
[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;
[0023] Figure 3 For the utility model Figure 2 The structural diagram of the enlarged part in the middle;
[0024] Figure 4 It is a front view structural schematic diagram of the utility model.
[0025] In the figure: 1. converter body; 2. mounting frame; 3. discharge pipe; 4. feed pipe; 5. gas injection pipe; 6. sealing valve; 7. limit block; 8. gas injection bin. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Example
[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the utility model provides an embodiment: a converter drop-type nitrogen injection device, comprising a converter body 1, a gas injection pipe 5 is movably inserted in an upper hole on one side of the converter body 1, and also includes a gas injection bin 8;
[0029] Specifically,
[0030] The gas injection bin 8 is connected to the bottom end of the gas injection pipe 5 installed inside the converter body 1;
[0031] Among them, the outer side of the bottom of the gas injection bin 8 is provided with through holes in a circular array.
[0032] By setting up a gas injection bin 8, at the same time, the gas injection bin 8 is connected to the bottom end of the gas injection pipe 5 installed on the inner side of the converter body 1, and through holes are opened in a circular array on the outer side of the bottom of the gas injection bin 8, so that when in use, the converter body 1 is movably installed through the mounting frame 2, and the nitrogen pipeline is connected and installed with the connecting pipe on the sealing valve 6, and the raw materials are injected into the converter body 1 through the feeding pipe 4, and after the raw materials are melted in the converter body 1, the sealing valve 6 is opened to allow nitrogen to be directly injected into the converter body 1 through the gas injection pipe 5. Since the bottom of the gas injection bin 8 is limited in the converter body 1 by the limit block 7, the nitrogen entering the gas injection bin 8 through the gas injection pipe 5 can be discharged from the gap between the bottom of the gas injection bin 8 and the bottom of the inner side of the converter body 1, so that the nitrogen can fully enter the molten steel, thereby achieving the purpose of improving the quality of steel and reducing impurities in the molten steel, and achieving the effect of fully mixing the nitrogen with the molten steel.
[0033] Furthermore, the top of the converter body 1 is opened and connected to a feed pipe 4, the other side of the converter body 1 is opened and connected to a discharge pipe 3, mounting frames 2 are rotatably installed on both the front and rear sides of the converter body 1, and a limit block 7 is fixedly installed in the middle of the bottom inner side of the converter body 1.
[0034] By opening the top of the converter body 1 and connecting it with a feed pipe 4, raw materials can be added into the converter body 1 through the feed pipe 4. At the same time, a hole is opened on the other side of the converter body 1 and connected with a discharge pipe 3, so that molten steel can be discharged through the discharge pipe 3 after steelmaking is completed. At the same time, mounting frames 2 are rotatably installed on both the front and rear sides of the converter body 1, so that the converter body 1 can be rotated through the mounting frame 2.
[0035] Furthermore, the top of the gas injection pipe 5 passes through the converter body 1 and is fixedly mounted with a sealing valve 6 .
[0036] By passing the top of the gas injection pipe 5 through the converter body 1 and fixing a sealing valve 6 thereon, the inside of the gas injection pipe 5 on the inner side of the converter body 1 can be relatively sealed after the sealing valve is closed, and the backflow of the molten steel can be prevented under the action of gas pressure. At the same time, nitrogen can be injected into the molten steel in the converter body 1 through the gas injection pipe 5 after the sealing valve 6 is opened.
[0037] Furthermore, a connecting pipe is provided at one end of the sealing valve 6 away from the gas injection pipe 5, and the sealing valve 6 adopts a manual ball valve structure design.
[0038] A connecting pipe is provided at the end of the sealing valve 6 away from the gas injection pipe 5, so that it can be connected and installed with the nitrogen pipeline through the connecting pipe. At the same time, the sealing valve 6 adopts a manual ball valve structure design, so as to avoid significant damage to the sealing valve 6 due to high temperature during use.
[0039] Furthermore, a limiting groove is provided in the middle of the bottom of the gas injection bin 8 , the size of which matches the size of the limiting block 7 , and the bottom of the gas injection bin 8 contacts the bottom of the inner wall of the converter body 1 but is not fixedly connected.
[0040] By opening a limiting groove in the middle of the bottom of the gas injection bin 8 and matching the size of the limiting groove with the size of the limiting block 7, the gas injection bin 8 can be positioned and installed on the inner bottom of the converter body 1 through the limiting block 7. At the same time, the bottom of the gas injection bin 8 is in contact with the bottom of the inner wall of the converter body 1 but not fixedly connected, thereby preventing molten steel from entering the gas injection bin 8, so that a relatively sealed environment can be created inside the gas injection pipe 5.
[0041] When the utility model is used, the converter body 1 is movably installed through the mounting frame 2, and the nitrogen pipeline is connected and installed with the connecting pipe on the sealing valve 6, and the raw material is injected into the converter body 1 through the feeding pipe 4, and after the raw material is melted in the converter body 1, the sealing valve 6 is opened to allow nitrogen to be directly injected into the converter body 1 through the gas injection pipe 5. Since the bottom of the gas injection bin 8 is limited in the converter body 1 by the limiting block 7, the nitrogen that enters the gas injection bin 8 through the gas injection pipe 5 can be discharged from the gap between the bottom of the gas injection bin 8 and the bottom of the inner side of the converter body 1, so that the nitrogen can fully enter the molten steel, thereby achieving the purpose of improving the quality of steel and reducing impurities in the molten steel.
[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A drop-type nitrogen injection device for a converter, comprising a converter body (1), wherein a gas injection pipe (5) is movably inserted into an upper hole on one side of the converter body (1), characterized in that: Also includes: A gas injection bin (8) connected to the bottom end of a gas injection pipe (5) installed inside the converter body (1); The outer side of the bottom of the gas injection bin (8) is provided with through holes in a circular array.
2. The converter drop-type nitrogen injection device according to claim 1, characterized in that: The top of the converter body (1) is open and connected to a feed pipe (4), the other side of the converter body (1) is opened and connected to a discharge pipe (3), the front and rear sides of the converter body (1) are both rotatably mounted with mounting frames (2), and a limit block (7) is fixedly mounted in the middle of the bottom of the inner side of the converter body (1).
3. The converter drop-type nitrogen injection device according to claim 1, characterized in that: The top of the gas injection pipe (5) passes through the converter body (1) and is fixedly provided with a sealing valve (6).
4. The converter drop-type nitrogen injection device according to claim 3, characterized in that: A connecting pipe is provided at one end of the sealing valve (6) which is away from the gas injection pipe (5), and the sealing valve (6) adopts a manual ball valve structure design.
5. The converter drop-type nitrogen injection device according to claim 1, characterized in that: A limiting groove is provided in the middle of the bottom of the gas injection bin (8), the size of which matches the size of the limiting block (7), and the bottom of the gas injection bin (8) contacts the bottom of the inner wall of the converter body (1) but is not fixedly connected.
Citation Information
Patent Citations
Prevent converter of slag splash
CN207143282U