Nitrogen increasing device for refining and smelting molten steel and smelting system

Abstract

The nitrogen increasing device and the smelting system for refining and smelting the molten steel comprise an argon supply unit and a nitrogen supply unit, the argon supply unit comprises an argon supply device and a gas inlet main pipe, and the two ends of the gas inlet main pipe are connected with the argon supply device and a gas inlet connector of a steel ladle respectively. A first stop valve and a first pneumatic valve are sequentially arranged on the air inlet main pipe; the nitrogen supply unit comprises a nitrogen supply device and an air inlet auxiliary pipe, the two ends of the air inlet auxiliary pipe are connected with the nitrogen supply device and the air inlet main pipe respectively, and a second stop valve and a second pneumatic valve are sequentially arranged on the air inlet auxiliary pipe. According to the nitrogen increasing device, molten steel in a steel ladle can be stirred through the argon supply unit, the slag inclusion removing effect is achieved, and the steel quality can be improved; and the nitrogen supply unit can increase nitrogen for the molten steel when the nitrogen content of the molten steel is too low, and compared with nitrogen ore, the production cost can be effectively reduced. The whole device is simple in structure, convenient to operate and maintain and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of smelting equipment technology, and in particular to a nitrogen-enhancing device and smelting system for refining molten steel. Background Technology

[0002] During the steelmaking process, various elements in the molten steel play different roles. Among them, increasing the nitrogen content in the molten steel can significantly improve the strength of the steel. At the same time, when producing some stainless steels, increasing the nitrogen content can also reduce the input of some precious metals. However, when producing some steel grades with high nitrogen content, the amount of nitrogen depends on the molten iron. If the nitrogen content in the molten iron is high, it is not a problem, as the nitrogen content can be reduced by adding alloys. If the nitrogen content is too low after the molten iron is smelted in the converter, then the produced steel cannot meet the production requirements of some steel grades.

[0003] Currently, when the nitrogen content in molten iron is too low, nitrogen is usually increased by adding ore to the molten steel. However, the production of each steel grade is often in large batches, and using ore to increase nitrogen will significantly increase the cost of steel production. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that in the prior art, when the nitrogen content in molten iron is too low, nitrogen is generally increased by adding ore to molten steel. However, the production of each steel grade is often in large batches, and using ore to increase nitrogen will significantly increase the cost of steel production.

[0005] To solve the above-mentioned technical problems, this utility model provides a nitrogen-enhancing device for refining molten steel, used to introduce nitrogen gas into the ladle on the ladle car to increase the nitrogen content of the molten steel, including,

[0006] An argon supply unit includes an argon supply device and an inlet pipe. The input end of the inlet pipe is connected to the output end of the argon supply device, and the output end of the inlet pipe is connected to the inlet connector of the ladle. A first shut-off valve and a first pneumatic valve are arranged sequentially on the inlet pipe from one end near its input end to the other end.

[0007] A nitrogen supply unit, comprising a nitrogen supply device and an intake manifold, wherein the input end of the intake manifold is connected to the output end of the nitrogen supply device, and the output end of the intake manifold is connected to the section of the main intake manifold located between the first pneumatic valve and the intake connector of the ladle, and wherein the intake manifold is provided with a second shut-off valve and a second pneumatic valve arranged sequentially from one end near its input end to the other end.

[0008] In one embodiment of this utility model, the intake sub-pipe includes a first intake sub-pipe and a second intake sub-pipe. The output end of the first intake sub-pipe is connected to the input end of the second intake sub-pipe via a quick-release connector. The input end of the first intake sub-pipe is connected to the output end of the nitrogen supply device. A second shut-off valve and a second pneumatic valve are sequentially arranged on the first intake sub-pipe. The output end of the second intake sub-pipe is connected to the main intake pipe.

[0009] In one embodiment of this utility model, a third shut-off valve is provided on the first intake manifold between the first pneumatic valve and the quick-release connector.

[0010] In one embodiment of this utility model, a fourth shut-off valve is provided on the second intake manifold.

[0011] In one embodiment of this utility model, a flow meter is also connected to the intake manifold near its output end.

[0012] In one embodiment of this utility model, the intake pipe is further provided with a flow regulating valve located between the first pneumatic valve and the flow meter.

[0013] In one embodiment of this utility model, a check valve located between the first pneumatic valve and the flow meter is also connected to the main intake pipe, and the connection point between the secondary intake pipe and the main intake pipe is located between the check valve and the flow regulating valve.

[0014] In one embodiment of this utility model, a first pressure sensor and a second pressure sensor are respectively provided on the main intake pipe and the secondary intake pipe.

[0015] In one embodiment of this utility model, a controller is also included, which is connected to the first pneumatic valve and the second pneumatic valve respectively.

[0016] A smelting system comprising a nitrogen enrichment device for refining molten steel as described in any of the preceding claims.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] This utility model discloses a nitrogen-enhancing device and smelting system for refining molten steel, comprising an argon supply unit and a nitrogen supply unit. The argon supply unit includes an argon supply device and an inlet main pipe. The input end of the inlet main pipe is connected to the output end of the argon supply device, and the output end of the inlet main pipe is connected to the inlet connector of the ladle. A first shut-off valve and a first pneumatic valve are sequentially arranged on the inlet main pipe. The nitrogen supply unit includes a nitrogen supply device and an inlet secondary pipe. The input end of the inlet secondary pipe is connected to the output end of the nitrogen supply device, and the output end of the inlet secondary pipe is connected to the section of the inlet main pipe located between the first pneumatic valve and the inlet connector of the ladle. A second shut-off valve and a second pneumatic valve are sequentially arranged on the inlet secondary pipe. This utility model's nitrogen-enhancing device for refining molten steel utilizes the argon supply unit to agitate and eliminate inclusions in the molten steel in the ladle, thus improving steel quality. The nitrogen supply unit, on the other hand, can enhance the nitrogen content of the molten steel when it is too low, effectively reducing production costs compared to using nitrogen ore. The entire device has a simple structure, is easy to operate and maintain, and is highly practical. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of a nitrogen-enhancing device for refining molten steel according to a preferred embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the argon supply unit of a nitrogen-enhancing device for refining molten steel according to a preferred embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the nitrogen supply unit of a nitrogen-enhancing device for refining molten steel, according to a preferred embodiment of the present invention.

[0023] Explanation of reference numerals in the accompanying drawings: 1. Argon supply unit; 11. Argon supply device; 12. Main inlet pipe; 13. First shut-off valve; 14. First pneumatic valve; 15. Flow meter; 16. Flow regulating valve; 17. Check valve; 2. Nitrogen supply unit; 21. Nitrogen supply device; 22. Secondary inlet pipe; 221. First secondary inlet pipe; 222. Secondary secondary inlet pipe; 223. Quick-release connector; 23. Second shut-off valve; 24. Second pneumatic valve; 25. Third shut-off valve; 26. Fourth shut-off valve; A. Ladle car. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example 1

[0025] Reference Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a nitrogen-enhancing device for refining molten steel, used to introduce nitrogen gas into the ladle on ladle car A to increase the nitrogen content of the molten steel, comprising:

[0026] Argon supply unit 1, which includes argon supply device 11 and inlet pipe 12. The input end of the inlet pipe 12 is connected to the output end of the argon supply device 11, and the output end of the inlet pipe 12 is connected to the inlet connector of the ladle. A first shut-off valve 13 and a first pneumatic valve 14 are arranged sequentially from one end near its input end to the other end.

[0027] Nitrogen supply unit 2 includes nitrogen supply device 21 and intake sub-pipe 22. The input end of intake sub-pipe 22 is connected to the output end of nitrogen supply device 21, and the output end of intake sub-pipe 22 is connected to the section of intake main pipe 12 located between the first pneumatic valve 14 and the intake connector of ladle. Second shut-off valve 23 and second pneumatic valve 24 are arranged sequentially from one end near its input end to the other end.

[0028] Specifically, in the initial state, the first shut-off valve 13 and the first pneumatic valve 14 are open, the second shut-off valve 23 and the second pneumatic valve 24 are closed, and the argon gas supply device 11 outputs argon gas and inputs it into the ladle through the gas inlet pipe 12. The argon gas is blown in from the bottom of the ladle, forming bubbles that rise to the surface. The disturbance generated by the rising bubbles accelerates the flow of molten steel and forms a stirring effect, which changes the uniformity of the composition and temperature of the molten steel. This helps to eliminate inclusions and impurities in the molten steel, reduce segregation, and improve the yield of deoxidizers and alloy materials. When the nitrogen content in the molten steel is too low and needs to be increased, the second shut-off valve 23 and the second pneumatic valve 24 are opened, and the quick-release connector 223 is manually connected. At the same time, the first pneumatic valve 14, the first shut-off valve 13, and the argon supply device 11 are closed. The nitrogen supply device 21 outputs nitrogen gas, which is then introduced into the ladle through the inlet auxiliary pipe 22 and the inlet main pipe 12. The nitrogen gas is blown in from the bottom of the ladle, which not only increases the nitrogen content of the molten steel but also acts as a stirrer, aiding in alloy melting and reducing the need for nitrogen ore input, thus lowering production costs. When the nitrogen content in the molten steel reaches a predetermined value, the second shut-off valve 23 and the second pneumatic valve 24 are closed, while the first shut-off valve 13 and the first pneumatic valve 14 are opened.

[0029] This invention discloses a nitrogen-enriching device for refining molten steel, comprising an argon supply unit 1 and a nitrogen supply unit 2. The argon supply unit 1 agitates the molten steel in the ladle and removes inclusions, thus improving steel quality. The nitrogen supply unit 2 adds nitrogen to the molten steel when its nitrogen content is too low, effectively reducing production costs compared to using nitrogen ore. The entire device has a simple structure, is easy to operate and maintain, and is highly practical.

[0030] Furthermore, the intake sub-pipe 22 includes a first intake sub-pipe 221 and a second intake sub-pipe 222. The output end of the first intake sub-pipe 221 and the input end of the second intake sub-pipe 222 are connected via a quick-release connector 223. The input end of the first intake sub-pipe 221 is connected to the output end of the nitrogen supply device 21. A second shut-off valve 23 and a second pneumatic valve 24 are sequentially installed on the first intake sub-pipe 221. The output end of the second intake sub-pipe 222 is connected to the main intake pipe 12. Specifically, the first intake sub-pipe 221 and the second intake sub-pipe 222 are connected via a quick-release connector 223. The quick-release connector 223 provides protection, preventing the air circuit from failing to close due to malfunctions in the valve structure, such as the second pneumatic valve 24, thus preventing safety accidents.

[0031] Furthermore, a third shut-off valve 25 is provided on the first intake manifold 221, located between the first pneumatic valve 14 and the quick-release connector 223.

[0032] Furthermore, a fourth shut-off valve 26 is provided on the second intake manifold 222. Specifically, the third shut-off valve 25 and the fourth shut-off valve 26 can prevent gas from escaping from the air passage.

[0033] Furthermore, a flow meter 15 is also connected to the intake manifold 12 near its output end.

[0034] Furthermore, the intake manifold 12 is also equipped with a flow regulating valve 16 located between the first pneumatic valve 14 and the flow meter 15. The flow meter 15 can measure the gas velocity and flow rate in the pipeline, and the flow velocity and flow rate can be adjusted according to the actual situation through the flow regulating valve 16.

[0035] Furthermore, a check valve 17 is connected to the intake main pipe 12 between the first pneumatic valve 14 and the flow meter 15, and the connection point between the intake secondary pipe 22 and the intake main pipe 12 is located between the check valve 17 and the flow regulating valve 16.

[0036] Furthermore, a first pressure sensor and a second pressure sensor are respectively installed on the main intake pipe 12 and the secondary intake pipe 22. The pressure sensors can monitor the pressure in the main intake pipe 12 and the secondary intake pipe 22 in real time to ensure the safe and smooth operation of the production process.

[0037] Furthermore, it also includes a controller, which is connected to the first pneumatic valve 14 and the second pneumatic valve 24 respectively. Specifically, the controller can interlock the first pneumatic valve 14 and the second pneumatic valve 24, so that when the first pneumatic valve 14 is open, the second pneumatic valve 24 is closed, and when the first pneumatic valve 14 is closed, the second pneumatic valve 24 is open, realizing rapid switching of the gas path. Specifically, the controller is connected to the argon gas supply device 11, the nitrogen gas supply device 21, the first pneumatic valve 14, the second pneumatic valve 24, the flow regulating valve 16, and the flow meter 15 respectively, and can realize automatic control of gas path switching and flow adjustment. Example 2

[0038] This utility model also discloses a smelting system, including a nitrogen-enhancing device for refining molten steel as described in Example 1.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A nitrogen-enhancing device for refining molten steel, used to introduce nitrogen gas into the ladle on a ladle car to increase the nitrogen content of the molten steel, characterized in that: include, An argon supply unit includes an argon supply device and an inlet pipe. The input end of the inlet pipe is connected to the output end of the argon supply device, and the output end of the inlet pipe is connected to the inlet connector of the ladle. A first shut-off valve and a first pneumatic valve are arranged sequentially on the inlet pipe from one end near its input end to the other end. A nitrogen supply unit, comprising a nitrogen supply device and an intake manifold, wherein the input end of the intake manifold is connected to the output end of the nitrogen supply device, and the output end of the intake manifold is connected to the section of the main intake manifold located between the first pneumatic valve and the intake connector of the ladle, and wherein the intake manifold is provided with a second shut-off valve and a second pneumatic valve arranged sequentially from one end near its input end to the other end.

2. The nitrogen-enhancing device for refining molten steel according to claim 1, characterized in that: The intake manifold includes a first intake manifold and a second intake manifold. The output end of the first intake manifold is connected to the input end of the second intake manifold via a quick-release connector. The input end of the first intake manifold is connected to the output end of the nitrogen supply device. A second shut-off valve and a second pneumatic valve are sequentially installed on the first intake manifold. The output end of the second intake manifold is connected to the main intake manifold.

3. The nitrogen-enhancing device for refining molten steel according to claim 2, characterized in that: A third shut-off valve is provided on the first intake manifold, located between the first pneumatic valve and the quick-release connector.

4. The nitrogen-enhancing device for refining molten steel according to claim 3, characterized in that: A fourth shut-off valve is installed on the second intake manifold.

5. The nitrogen-enhancing device for refining molten steel according to claim 1, characterized in that: The intake manifold is also connected to a flow meter near its output end.

6. The nitrogen-enhancing device for refining molten steel according to claim 5, characterized in that: The intake manifold is also equipped with a flow regulating valve located between the first pneumatic valve and the flow meter.

7. The nitrogen-enhancing device for refining molten steel according to claim 6, characterized in that: The main intake pipe is also connected to a check valve located between the first pneumatic valve and the flow meter, and the connection point between the secondary intake pipe and the main intake pipe is located between the check valve and the flow regulating valve.

8. The nitrogen-enhancing device for refining molten steel according to claim 1, characterized in that: The main intake pipe and the secondary intake pipe are respectively equipped with a first pressure sensor and a second pressure sensor.

9. The nitrogen-enhancing device for refining molten steel according to claim 1, characterized in that: It also includes a controller, which is connected to the first pneumatic valve and the second pneumatic valve respectively.

10. A smelting system, characterized in that: Includes a nitrogen-enhancing device for refining molten steel as described in any one of claims 1-9.

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