A supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace

Abstract

This utility model discloses a supersonic clustered carbon-oxygen lance burner for a cyclone electric arc furnace, relating to the field of carbon-oxygen lances. It addresses the problem that existing carbon-oxygen lances use welded connections between all components, requiring the entire lance to be replaced if a single component fails, resulting in high maintenance costs. The new design features a threaded connection: a first internally threaded tube is fixedly connected to the front end of the outer protective tube at the rear end of a first circular opening; a second internally threaded tube is fixedly connected to the front end of the outer protective tube at the rear end of a second circular opening; a carbon powder tube is connected to the rear end of the first internally threaded tube; and an oxygen tube is connected to the rear end of the second internally threaded tube. A connecting ring is fixedly connected to the rear end of the outer wall of the outer protective tube, and a connecting plate is fixedly connected to the rear end of the connecting ring. This threaded connection structure replaces the traditional welding method, allowing the carbon powder tube and oxygen tube to be independently disassembled and replaced, avoiding the need for complete scrapping due to damage to a single component and significantly reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of carbon-oxygen lances, specifically a supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace. Background Technology

[0002] A carbon-oxygen lance is a spraying device used in the steelmaking process in the metallurgical industry. It mainly consists of the lance body, a cooling system, and a nozzle. Its core function is to inject a mixture of oxygen and carbon powder (or hydrocarbon fuel) into molten steel under high pressure. The oxidation reaction generates high temperatures (up to 2000°C or higher) and intense stirring, achieving decarburization, dephosphorization, temperature increase, and composition homogenization. In electric arc furnace (EAC) or converter steelmaking, the carbon-oxygen lance can significantly shorten smelting time, improve energy efficiency, and reduce impurity content. Its nozzle typically employs a copper water-cooled design to withstand extreme high temperatures.

[0003] For example, the authorization announcement number CN 206828559 U relates to an electric furnace carbon-oxygen lance, including a nozzle and a lance body. The lance body includes an outer tube, a middle tube welded assembly, an inner tube welded assembly, and a liner. The distance between the centerline of the liner and the centerline of the lance body is 21mm. This utility model shortens the smelting time by more than 20%, improves the quality of molten steel, reduces the labor intensity of workers, and improves production efficiency by more than 30%.

[0004] However, in the above-mentioned technologies, all the components of the carbon-oxygen lance are connected by welding, which means that if a single component is damaged, the entire carbon-oxygen lance needs to be replaced, resulting in high maintenance costs. Therefore, there is an urgent need in the market to develop a supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide a supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace, in order to solve the problem mentioned in the background art that the various pipes of the carbon-oxygen lance are all connected by welding, which means that when a single pipe is damaged, the entire carbon-oxygen lance needs to be replaced, resulting in high maintenance costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a supersonic clustered carbon-oxygen lance burner for a cyclone electric arc furnace, comprising an outer protective tube, wherein a first circular opening and a second circular opening are respectively provided at the upper and lower ends of the middle of the front end face of the outer protective tube; a first internally threaded tube is fixedly connected to the front end face of the inner side of the outer protective tube at the rear end of the first circular opening; a second internally threaded tube is fixedly connected to the front end face of the inner side of the outer protective tube at the rear end of the second circular opening; a carbon powder tube is connected to the rear end of the first internally threaded tube; an oxygen tube is connected to the rear end of the second internally threaded tube; a connecting ring is fixedly connected to the rear end of the outer wall of the outer protective tube; and a connecting plate is fixedly connected to the rear end of the connecting ring.

[0007] Preferably, a toner nozzle is fixedly connected to the front end of the toner tube, and a first external thread is fixedly provided on the front end of the outer wall of the toner tube. The front end of the toner tube is inserted into the interior of the first internal thread tube, and the first external thread is threadedly connected and fixed to the first internal thread tube. After the front end of the toner tube is inserted into the interior of the first internal thread tube, the toner nozzle extends out of the front end of the outer protective tube through the first circular opening. A second sealing ring is provided between the front end of the toner tube and the front end face of the inner side of the outer protective tube.

[0008] Preferably, an oxygen nozzle is fixedly connected to the front end of the oxygen tube, and a second external thread is fixedly provided on the front end of the outer wall of the oxygen tube. The front end of the oxygen tube is inserted into the interior of the second internal thread tube, and the second external thread is threadedly connected and fixed to the second internal thread tube. After the front end of the oxygen tube is inserted into the interior of the second internal thread tube, the oxygen nozzle extends out of the front end of the outer protective tube through the second circular opening. A third sealing ring is provided between the front end of the oxygen tube and the front end face of the inner side of the outer protective tube.

[0009] Preferably, a fixing ring is fixedly connected to the middle of the inner wall of the outer protective tube, a circular partition plate is provided at the rear end of the fixing ring, a first sealing ring is provided between the rear end of the fixing ring and the circular partition plate, the middle of the toner tube and the oxygen tube both pass through the interior of the circular partition plate, a first tightening ring and a second tightening ring are fixedly connected to the middle of the outer wall of the toner tube and the oxygen tube at the rear end of the circular partition plate, respectively, and a fourth sealing ring and a fifth sealing ring are provided between the first tightening ring and the second tightening ring and the circular partition plate, respectively.

[0010] Preferably, a cooling chamber is provided inside the outer protective tube and at the front end of the circular partition plate. A cooling water inlet pipe is fixedly connected to one side of the upper end of the cooling chamber and to the outer wall of the outer protective tube, and a cooling water outlet pipe is fixedly connected to the other side of the lower end of the cooling chamber and to the outer wall of the outer protective tube.

[0011] Preferably, the connecting plate and the connecting ring are connected by bolts. The connecting plate has a first through hole and a second through hole at its upper and lower ends in the middle. A first rectangular limiting groove is provided on both sides of the first through hole, and a second rectangular limiting groove is provided on both sides of the second through hole.

[0012] Preferably, the rear ends of the toner tube and the oxygen tube extend out of the rear end face of the connecting plate through the first through hole and the second through hole, respectively. A first rectangular limiting strip is fixedly connected to both sides of the rear end of the toner tube, and a second rectangular limiting strip is fixedly connected to both sides of the rear end of the oxygen tube. The two first rectangular limiting strips slide into the two first rectangular limiting grooves, and the two second rectangular limiting strips slide into the two second rectangular limiting grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, a threaded connection structure is used to replace the traditional welding method. The carbon powder tube and oxygen tube can be disassembled and replaced independently, avoiding the overall scrapping due to damage to a single tube and greatly reducing maintenance costs.

[0015] (2) In this utility model, the sealing performance of the carbon-oxygen gun is ensured under high temperature and high pressure environment through the multi-layer sealing ring design; at the same time, the circulating water cooling structure is adopted to effectively protect the carbon powder tube and oxygen tube and extend the service life.

[0016] (3) In this utility model, the connecting plate restricts the rotation of the toner tube and oxygen tube by a rectangular limiting strip, preventing the threaded connection from loosening due to vibration during operation, thereby improving the stability and safety of the equipment operation. Attached Figure Description

[0017] Figure 1 This is a front view of a supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to this utility model;

[0018] Figure 2 This is a side sectional view of the present invention;

[0019] Figure 3 This is a main sectional view of the connecting plate of this utility model;

[0020] Figure 4 This is a detailed enlarged view of part A of this utility model;

[0021] Figure 5 This is a detailed enlarged view of part B of this utility model.

[0022] In the diagram: 1. Outer protective tube; 101. First circular opening; 102. Second circular opening; 103. First internally threaded tube; 104. Second internally threaded tube; 105. Retaining ring; 106. First sealing ring; 107. Cooling chamber; 108. Cooling water inlet pipe; 109. Cooling water outlet pipe; 110. Connecting ring; 2. Toner tube; 201. First external thread; 202. Toner nozzle; 203. Second sealing ring; 204. First clamping ring. 205. Ring; 3. First rectangular limiting strip; 4. Oxygen pipe; 501. Second external thread; 6. Oxygen nozzle; 7. Third sealing ring; 8. Second tightening ring; 9. Second rectangular limiting strip; 10. Circular partition plate; 11. Fourth sealing ring; 12. Fifth sealing ring; 13. Connecting plate; 14. Bolt; 15. First through hole; 16. First rectangular limiting groove; 17. Second through hole; 18. Second rectangular limiting groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-5 This utility model provides an embodiment of a supersonic clustered carbon-oxygen lance burner for a cyclone electric arc furnace, comprising an outer protective tube 1. A first circular opening 101 and a second circular opening 102 are respectively provided at the upper and lower ends of the middle of the front end face of the outer protective tube 1. A first internally threaded tube 103 is fixedly connected to the front end face of the inner side of the outer protective tube 1 at the rear end of the first circular opening 101. A second internally threaded tube 104 is fixedly connected to the front end face of the inner side of the outer protective tube 1 at the rear end of the second circular opening 102. A carbon powder tube 2 is connected to the rear end of the first internally threaded tube 103, and an oxygen tube 3 is connected to the rear end of the second internally threaded tube 104. A carbon powder nozzle 202 is fixedly connected to the front end of the carbon powder tube 2. A first external thread 201 is fixedly provided on the front end of the outer wall of the carbon powder tube 2. The front end of the carbon powder tube 2 is inserted into the first internally threaded tube 103, and the first external thread 201 is threadedly connected and fixed to the first internally threaded tube 103. After the front end of the carbon powder tube 2 is inserted into the first internally threaded tube 103, the carbon powder nozzle 202 extends out of the outer protective tube 1 through the first circular opening 101. A second sealing ring 203 is provided between the front end of the toner tube 2 and the inner front end face of the outer protective tube 1. An oxygen nozzle 302 is fixedly connected to the front end of the oxygen tube 3. A second external thread 301 is fixedly provided on the front end of the outer wall of the oxygen tube 3. The front end of the oxygen tube 3 is inserted into the second internal thread tube 104 and the second external thread 301 is threadedly connected and fixed to the second internal thread tube 104. After the front end of the oxygen tube 3 is inserted into the second internal thread tube 104, the oxygen nozzle 302 extends out of the front end of the outer protective tube 1 through the second circular opening 102. A third sealing ring 303 is provided between the front end of the oxygen tube 3 and the inner front end face of the outer protective tube 1. The second sealing ring 203 and the third sealing ring 303 seal the toner tube 2 and the oxygen tube 3 with the inner front end face of the outer protective tube 1. By rotating the toner tube 2 and the oxygen tube 3, the front ends of the toner tube 2 and the oxygen tube 3 are separated from the first internal thread tube 103 and the second internal thread tube 104, respectively. The toner tube 2 and the oxygen tube 3 can then be pulled out from the rear end of the outer protective tube 1 for easy replacement.

[0025] Please see Figure 2 and Figure 5A fixing ring 105 is fixedly connected to the middle of the inner wall of the outer protective tube 1. A circular partition plate 4 is provided at the rear end of the fixing ring 105. A first sealing ring 106 is provided between the rear end of the fixing ring 105 and the circular partition plate 4. The middle parts of the toner tube 2 and the oxygen tube 3 both pass through the interior of the circular partition plate 4. A first tightening ring 204 and a second tightening ring 304 are fixedly connected to the middle of the outer wall of the toner tube 2 and the rear end of the circular partition plate 4, respectively. A fourth sealing ring 401 and a fifth sealing ring 402 are provided between the first tightening ring 204 and the second tightening ring 304 and the circular partition plate 4, respectively. A cooling chamber 107 is provided inside the outer protective tube 1 at the front end of the circular partition plate 4. A cooling chamber 107 is fixed on one side of the upper end of the outer protective tube 1 on the outer wall. A cooling water inlet pipe 108 is fixedly connected to the cooling chamber 107. A cooling water outlet pipe 109 is fixedly connected to the other side of the lower end of the cooling chamber 107 and to the outer wall of the outer protective pipe 1. The connection between the toner pipe 2 and the oxygen pipe 3 allows the first tightening ring 204 and the second tightening ring 304 to push the circular partition plate 4 and the fixed ring 105 together to tighten them. The first sealing ring 106, the fourth sealing ring 401 and the fifth sealing ring 402 seal each connection point, thereby sealing the cooling chamber 107. When the whole device is in use, cooling water is supplied to the cooling chamber 107 through the cooling water inlet pipe 108 and discharged from the cooling water outlet pipe 109, so that the cooling water flows inside the cooling chamber 107 and cools the toner pipe 2 and the oxygen pipe 3 at the same time.

[0026] Please see Figure 2 and Figure 3 A connecting ring 110 is fixedly connected to the rear end of the outer protective tube 1. A connecting plate 5 is fixedly connected to the rear end of the connecting ring 110. The connecting plate 5 and the connecting ring 110 are connected by bolts. The middle of the connecting plate 5 has a first through hole 502 and a second through hole 504 at its upper and lower ends, respectively. A first rectangular limiting groove 503 is provided on both sides of the first through hole 502, and a second rectangular limiting groove 505 is provided on both sides of the second through hole 504. The rear ends of the toner tube 2 and the oxygen tube 3 extend out of the rear end face of the connecting plate 5 through the first through hole 502 and the second through hole 504, respectively. A first rectangular limiting strip 205 is fixedly connected to both sides of the rear end of the toner tube 2, and a first rectangular limiting strip 205 is fixedly connected to both sides of the rear end of the oxygen tube 3. There is a second rectangular limiting strip 305, and two first rectangular limiting strips 205 slide into two first rectangular limiting grooves 503 respectively. Two second rectangular limiting strips 305 slide into two second rectangular limiting grooves 505 respectively. The connecting plate 5 seals the rear end of the outer protective tube 1. The first rectangular limiting strips 205 slide into the first rectangular limiting grooves 503 to restrict the rotation of the toner tube 2. The second rectangular limiting strips 305 slide into the second rectangular limiting grooves 505 to restrict the rotation of the oxygen tube 3. This prevents the toner tube 2 and oxygen tube 3 from rotating due to vibration during use and from detaching from the first internal thread tube 103 and the second internal thread tube 104 respectively.

[0027] Working principle: During use, cooling water enters the sealed cooling chamber 107 through the cooling water inlet pipe 108, circulates along the outer walls of the toner pipe 2 and oxygen pipe 3, and is discharged from the cooling water outlet pipe 109, effectively removing high-temperature heat. When maintenance is required, loosen the bolts 501 of the connecting plate 5 to separate the connecting plate 5 from the outer protective pipe 1. After releasing the limiting effect of the first rectangular limiting strip 205 and the second rectangular limiting strip 305, the toner pipe 2 and oxygen pipe 3 can be rotated to separate them from the first internal threaded pipe 103 and the second internal threaded pipe 104, and pulled out from the rear end of the outer protective pipe 1, realizing independent replacement of individual pipe components. Each sealing ring group (second sealing ring 203, third sealing ring 303, etc.) ensures the sealing of the medium transportation and cooling system, while the first tightening ring 204 and the second tightening ring 304 automatically press the circular partition plate 4 during assembly, forming a stable multi-layer sealing protection.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace, comprising an outer protective tube (1), characterized in that: The outer protective tube (1) has a first circular opening (101) and a second circular opening (102) at the top and bottom of the middle of the front end face. The outer protective tube (1) has a first internal threaded tube (103) fixedly connected to the front end face of the inner side and the rear end of the first circular opening (101). The outer protective tube (1) has a second internal threaded tube (104) fixedly connected to the front end face of the inner side and the rear end of the second circular opening (102). The rear end of the first internal threaded tube (103) is connected to a toner tube (2). The rear end of the second internal threaded tube (104) is connected to an oxygen tube (3). The rear end of the outer wall of the outer protective tube (1) is fixedly connected to a connecting ring (110). The rear end of the connecting ring (110) is fixedly connected to a connecting plate (5).

2. The supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 1, characterized in that: The toner tube (2) is fixedly connected to the front end of the toner nozzle (202). The front end of the outer wall of the toner tube (2) is fixedly provided with a first external thread (201). The front end of the toner tube (2) is inserted into the first internal thread tube (103) and the first external thread (201) is threadedly connected and fixed to the first internal thread tube (103). After the front end of the toner tube (2) is inserted into the first internal thread tube (103), the toner nozzle (202) extends out of the front end of the outer protective tube (1) through the first circular opening (101). A second sealing ring (203) is provided between the front end of the toner tube (2) and the front end face of the inner side of the outer protective tube (1).

3. The supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 1, characterized in that: The oxygen tube (3) is fixedly connected to an oxygen nozzle (302) at its front end. The front end of the outer wall of the oxygen tube (3) is fixedly provided with a second external thread (301). The front end of the oxygen tube (3) is inserted into the interior of the second internal thread tube (104) and the second external thread (301) is threadedly connected and fixed to the second internal thread tube (104). After the front end of the oxygen tube (3) is inserted into the interior of the second internal thread tube (104), the oxygen nozzle (302) passes through the second circular opening (102) and extends out of the front end of the outer protective tube (1). A third sealing ring (303) is provided between the front end of the oxygen tube (3) and the front end face of the inner side of the outer protective tube (1).

4. The supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 1, characterized in that: A fixing ring (105) is fixedly connected to the middle of the inner wall of the outer protective tube (1). A circular partition plate (4) is provided at the rear end of the fixing ring (105). A first sealing ring (106) is provided between the rear end of the fixing ring (105) and the circular partition plate (4). The middle of the toner tube (2) and the oxygen tube (3) both pass through the interior of the circular partition plate (4). A first tightening ring (204) and a second tightening ring (304) are fixedly connected to the middle of the outer wall of the toner tube (2) and the rear end of the circular partition plate (4), respectively. A fourth sealing ring (401) and a fifth sealing ring (402) are provided between the first tightening ring (204) and the second tightening ring (304) and the circular partition plate (4), respectively.

5. The supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 1, characterized in that: A cooling chamber (107) is provided inside the outer protective pipe (1) and at the front end of the circular partition plate (4). A cooling water inlet pipe (108) is fixedly connected to one side of the upper end of the cooling chamber (107) and to the outer wall of the outer protective pipe (1). A cooling water outlet pipe (109) is fixedly connected to the other side of the lower end of the cooling chamber (107) and to the outer wall of the outer protective pipe (1).

6. The supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 1, characterized in that: The connecting plate (5) and the connecting ring (110) are connected by bolts. The connecting plate (5) has a first through hole (502) and a second through hole (504) at the upper and lower ends of the middle part, respectively. The first through hole (502) has a first rectangular limiting groove (503) on both sides, and the second through hole (504) has a second rectangular limiting groove (505) on both sides.

7. A supersonic clustered carbon-oxygen lance burner for a vortex electric arc furnace according to claim 6, characterized in that: The rear ends of the toner tube (2) and the oxygen tube (3) extend out of the rear end face of the connecting plate (5) through the first through hole (502) and the second through hole (504), respectively. The rear ends of the toner tube (2) are fixedly connected to both sides of the rear end of the toner tube (2), and the rear ends of the oxygen tube (3) are fixedly connected to both sides of the rear end of the oxygen tube (3). The two first rectangular limit bars (205) slide into the two first rectangular limit grooves (503), and the two second rectangular limit bars (305) slide into the two second rectangular limit grooves (505).

Images