A cooling water circulation structure of an oxygen lance and an oxygen lance with the same

Abstract

The present application relates to converter oxygen lance technical field, especially to a kind of oxygen lance cooling water circulation structure and oxygen lance with the structure.Oxygen lance cooling water circulation structure includes the water inlet passage between oxygen lance inner tube and oxygen lance middle tube, and the backwater passage between oxygen lance middle tube and oxygen lance outer tube, annular backwater cyclone groove is arranged on oxygen lance middle tube close to oxygen lance head, and the outlet end of backwater cyclone groove is rounded radius greater than the inlet end of backwater cyclone groove.This application sets backwater cyclone groove on backwater passage, and the flow rate and flow of cooling water are improved by the fact that oxygen lance water inlet passage is slightly wider than backwater passage, thereby improving the oxygen lance circulation cooling effect, effectively prolonging the service life of oxygen lance, and ensuring the safety of converter production process.

Description

Technical Field

[0001] This invention relates to the field of converter oxygen lance technology, and more particularly to an oxygen lance cooling water circulation structure and an oxygen lance having the structure. Background Technology

[0002] The oxygen lance for a converter is a water-cooled composite sleeve device that injects high-pressure industrial pure oxygen into the converter's molten pool in the form of a supersonic jet. Typically, the inner tube of the oxygen lance is the oxygen channel, used to transport high-purity oxygen; the annular gap between the middle and inner layers is the cooling water inlet channel; and the annular gap between the outer and middle layers is the cooling water outlet channel. The core function of the oxygen lance is to achieve decarburization, dephosphorization, and temperature increase through the vigorous oxidation reaction between oxygen and elements such as C, Si, Mn, and P in the molten iron. Simultaneously, it agitates the molten pool to accelerate slag formation and promote uniform composition. The oxygen lance relies on forced-circulation cooling water to withstand the furnace's high temperatures exceeding 1600℃, preventing lance body burn-out.

[0003] The oxygen lance is one of the key pieces of equipment in converter steelmaking. Its performance directly affects the smelting effect and energy consumption, which in turn affects the quality and yield of steel. The service life and operational safety of the oxygen lance are crucial indicators. The working environment inside the converter is hot, and each heat of oxygen lance blowing lasts approximately 10-15 minutes. The entire lance operates at high temperatures and is subject to severe heat radiation. Ineffective water cooling will directly affect the service life and blowing effect of the oxygen lance. Furthermore, poor water cooling can lead to uneven heating of the entire lance, easily causing weld breakage at the outer tube weld. If cooling water flows into the converter along the weld breakage, it can cause a major production accident, endangering the lives of operators.

[0004] Chinese utility model patent CN221662967U discloses "an oxygen lance cooling device," which includes a water-cooled sleeve. In use, the water-cooled sleeve is nested around the outside of the oxygen lance nozzle for cooling. Coolant enters the inlet chamber through the inlet port, flows into the outlet chamber, and exits through the outlet port, completing the cooling cycle. This external water-cooled sleeve makes the oxygen lance inconvenient to use and affects the oxygen lance blowing effect. Furthermore, it essentially still relies on cooling water circulation to cool the oxygen lance body, without fundamentally improving the circulation cooling efficiency. Summary of the Invention

[0005] This invention provides an oxygen lance cooling water circulation structure and an oxygen lance with the structure. By setting a return water vortex in the return water passage and making the oxygen lance inlet channel slightly wider than the return water channel, the flow rate and flow of cooling water are increased, thereby improving the oxygen lance circulation cooling effect, effectively extending the service life of the oxygen lance, and ensuring the safety of the converter production process.

[0006] To achieve the above objectives, the present invention employs the following technical solution: An oxygen lance cooling water circulation structure includes an inlet passage between the inner tube and the middle tube of the oxygen lance, and a return passage between the middle tube and the outer tube of the oxygen lance. The inlet passage and the return passage are interconnected through an oxygen lance head connecting structure. An annular return water vortex is provided on the middle tube of the oxygen lance near the oxygen lance head. The return water vortex has a groove on the side facing the return water passage. The inlet end of the groove is rounded, and the outlet end of the groove is rounded. The radius of the rounded end of the outlet end is larger than the radius of the rounded end of the inlet end. The length of the return water vortex is ≥80mm.

[0007] The radius of the rounded end at the water inlet is 10-15 mm, and the radius of the rounded end at the water outlet is 200-230 mm. The distance between the outer ends of the rounded ends at the water inlet and the water outlet is 70-100 mm.

[0008] The return water vortex is an integrally formed structure, which is welded to the oxygen lance tube.

[0009] The return water vortex is formed by forging.

[0010] The radial width of the water inlet passage is 3 to 5 mm greater than the radial width of the water return passage.

[0011] An oxygen lance having the aforementioned oxygen lance cooling water circulation structure.

[0012] Compared with the prior art, the beneficial effects of the present invention are: (1) A return water vortex is set up in the return water passage. The rounded ends of the return water vortex are used to increase the return water velocity and flow rate, so that the cooling water per unit flow rate can carry out more heat, thereby enhancing the cooling effect of the oxygen gun.

[0013] (2) The return water vortex channel adopts an integrated structure without welding points to minimize the resistance of cooling water.

[0014] (3) The return water vortex is an independently installed structure, which can be independently designed and processed according to the size of the oxygen lance, resulting in lower production costs.

[0015] (4) The oxygen lance inlet passage is slightly wider than the return passage, which effectively increases the cooling water flow rate and makes the cooling water circulation efficiency higher.

[0016] (5) By increasing the flow rate and volume of cooling water, the heat transfer efficiency is increased, the overall heat dissipation effect of the oxygen lance is guaranteed, the service life of the oxygen lance is effectively extended, and safety accidents are prevented. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an oxygen lance structure for accelerating water return, as described in this invention.

[0018] Figure 2 This is a schematic diagram of the structure of the return water vortex channel described in this invention.

[0019] In the diagram: 1. Return water vortex 2. Oxygen lance outer tube 3. Oxygen lance inner tube 4. Water inlet passage 5. Return water passage 6. Oxygen lance middle tube 1-1. Water inlet end rounded 1-2. Water outlet end rounded Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figure 1 As shown, the oxygen lance cooling water circulation structure of the present invention includes an inlet passage 4 between the oxygen lance inner tube 3 and the oxygen lance middle tube 6, and a return passage 5 between the oxygen lance middle tube 6 and the oxygen lance outer tube 2. The inlet passage 4 and the return passage 5 are interconnected through an oxygen lance head communication structure. An annular return water vortex 1 is provided on the oxygen lance middle tube 6 near the oxygen lance head. The return water vortex 1 has a groove on the side facing the return water passage 5. The inlet end of the groove has an inlet end rounded 1-1, and the outlet end of the groove has an outlet end rounded 1-2. The radius of the outlet end rounded 1-2 is larger than the radius of the inlet end rounded 1-1. The length of the return water vortex 1 is ≥80mm.

[0021] Furthermore, such as Figure 2 As shown, the radius of the inlet end rounding 1-1 is 10-15mm, and the radius of the outlet end rounding 1-2 is 200-230mm.

[0022] Furthermore, the distance between the outer ends of the inlet end rounded 1-1 and the outlet end rounded 1-2 is 70-100mm.

[0023] Furthermore, the return water vortex 1 is an integrally formed structure and is welded to the oxygen lance tube 6.

[0024] Furthermore, the return water vortex 1 is formed by forging.

[0025] Furthermore, the radial width of the water inlet passage 4 is 3 to 5 mm greater than the radial width of the water return passage 5.

[0026] The oxygen lance of the present invention has the oxygen lance cooling water circulation structure described above.

[0027] The present invention discloses an oxygen lance cooling water circulation structure in which cooling water enters the oxygen lance through the inlet passage 4, turns at the oxygen lance head (jet end), and then flows out of the oxygen lance through the return passage 5. Unlike the prior art, the present invention provides a return water vortex 1 near the oxygen lance head in the oxygen lance tube 6. The return water vortex 1 is located on the return water passage 5 to increase the flow rate of the cooling water return. The accelerated water flow can carry away heat in time, thereby ensuring a better cooling effect.

[0028] The structural features, working principle, and effects of the oxygen lance cooling water circulation structure described in this invention are as follows: 1. The return water vortex 1 is preferably formed by one-piece forging, with a smooth surface and no weld joints, resulting in low mechanical resistance and maximizing the smooth flow of cooling water. The return water vortex 1 is preferably an independent structure, which is welded and assembled with the oxygen lance tube 6. It can be designed differently according to the size of the oxygen lance and the cooling requirements, and is easy to replace and has a lower cost (compared to the overall casting structure).

[0029] 2. When the cooling water return flows through the rounded end 1-1 of the return water vortex 1, the radius of the rounded end 1-1 is small and the slope is large, which can significantly increase the return water velocity. When the cooling water return flows through the rounded end 1-2, the radius of the rounded end 1-2 is large and the slope is also large, which is conducive to the cooling water returning faster and more smoothly flowing out of the return water vortex 1, further accelerating the return water velocity.

[0030] 3. The oxygen lance's inlet passage 4 is slightly wider than the return passage 5 (radial dimension), which increases the cooling water flow rate when the cooling water return flow rate is greater than the inlet flow rate, thereby improving the cooling water circulation efficiency.

[0031] 4. The oxygen lance using the cooling water circulation structure described in this invention can effectively increase the flow rate and volume of cooling water, thereby increasing the heat transfer efficiency, enhancing the cooling effect of the oxygen lance, improving the service life of the oxygen lance, saving steel companies' production costs, and effectively preventing safety accidents.

[0032] To more intuitively illustrate the present invention, the embodiments of the present invention will be further described in conjunction with the examples. The following examples are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solutions that can be obviously obtained by those skilled in the art within the scope of the technology disclosed in the present invention, including simple variations or equivalent substitutions, are all within the scope of protection of the present invention.

[0033]

Example

[0034] In this embodiment, the radius of the inlet end rounded corner 1-1 is 12mm, the radius of the outlet end rounded corner 1-2 is 220mm, and the distance between the outer ends of the inlet end rounded corner 1-1 and the outlet end rounded corner 1-2 is 80mm.

[0035] In this embodiment, the return water vortex 1 is an integral forged structure, which is welded to the oxygen lance tube 6.

[0036] In this embodiment, the radial width of the water inlet passage 4 is 4 mm greater than the radial width of the water return passage 5.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An oxygen lance cooling water circulation structure, comprising a water inlet passage disposed between the inner tube and the middle tube of the oxygen lance, and a water return passage disposed between the middle tube and the outer tube of the oxygen lance, wherein the water inlet passage and the water return passage are interconnected through an oxygen lance head communication structure; characterized in that, An annular return water vortex is provided on the middle tube of the oxygen lance near the head of the oxygen lance. The return water vortex has a groove on the side facing the return water passage. The water inlet end of the groove is rounded, and the water outlet end of the groove is rounded. The radius of the rounded end of the water outlet end is larger than the radius of the rounded end of the water inlet end. The length of the return water vortex is ≥80mm.

2. The oxygen lance cooling water circulation structure according to claim 1, characterized in that, The inlet end has a rounding radius of 10-15mm, and the outlet end has a rounding radius of 200-230mm.

3. The oxygen lance cooling water circulation structure according to claim 1, characterized in that, The distance between the outer ends of the rounded inlet end and the rounded outlet end is 70-100mm.

4. The oxygen lance cooling water circulation structure according to claim 1, characterized in that, The return water vortex is an integrally formed structure, which is welded to the oxygen lance tube.

5. The oxygen lance cooling water circulation structure according to claim 4, characterized in that, The return water vortex is formed by forging.

6. The oxygen lance cooling water circulation structure according to claim 1, characterized in that, The radial width of the water inlet passage is 3 to 5 mm greater than the radial width of the water return passage.

7. An oxygen lance, characterized in that, It has the oxygen lance cooling water circulation structure as described in any one of claims 1 to 6.

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