Sealing device for oxygen lance opening of converter

Abstract

The utility model provides a sealing device for an oxygen lance opening of a converter, which comprises a shell, an oxygen lance opening sealing device and an oxygen lance opening sealing device, and the shell comprises a cover plate, an outer side annular plate and a bottom plate; the shell is connected with the outer wall of the sliding through pipe, and the sliding through pipe is provided with a connecting hole; the first blowing ring and the second blowing ring are arranged on the inner wall of the sliding through pipe in a nested mode, a plurality of blowing holes are formed in the inner wall of the first blowing ring and the inner wall of the second blowing ring in the circumferential direction, and the blowing holes communicate with the connecting holes; the connecting holes and the blowing holes are inclined by a certain angle to the bottom plate relative to the horizontal plane where the second blowing ring is located in the longitudinal section, and the blowing holes are inclined by a certain angle relative to the radial direction in the overlook section of the first blowing ring and the second blowing ring. By changing the positions and the angles of the injection holes in the first injection ring and the second injection ring, the direction and the strength of airflow ejected by nitrogen are changed, so that the airflow is tangent to the outer wall of the oxygen lance after being ejected, the intensity of the airflow is prevented from being weakened, smoke is prevented from rising along the inner wall of the sliding through pipe, and the working environment is improved.

Description

Technical Field

[0001] The utility model relates to the field of converter oxygen lance mouth sealing, in particular to a converter oxygen lance mouth sealing device. Background Art

[0002] During the smelting process of the converter, an oxygen lance is installed directly above the converter mouth to spray high-purity oxygen into the converter, thereby accelerating the reduction of carbon content in the converter. However, when the oxygen lance sprays oxygen, the converter will produce a large amount of gas, dust and other particulate matter that will fly out from the converter mouth and the oxygen lance. If effective sealing measures are not taken, it will not only be detrimental to the safe operation of the equipment, causing smoke in the factory and polluting the environment, but also cause the gas concentration in the factory tower to exceed the alarm value, making it impossible to inspect, maintain and repair the equipment. In order to prevent smoke and flames from overflowing from the oxygen lance mouth of the converter, conventional technology usually uses nitrogen to seal the oxygen lance mouth. The specific method is to fix a hollow circular ring with a diameter slightly larger than the oxygen lance directly above the oxygen lance mouth of the converter, and evenly open several holes on the inner wall of the circular ring that are tilted upward at a certain angle. Nitrogen is sprayed from each hole to achieve the sealing of the oxygen lance mouth.

[0003] In the prior art, such as Figure 1 As shown, the original nitrogen sealing plug is provided with an upper and lower layer of hollow rings, and the hollow rings are provided with nitrogen sealing holes, and the nitrogen sealing holes are arranged radially so that the blowing airflow is perpendicular to the outer wall of the oxygen lance, so that the nitrogen airflow contacts the outer wall of the oxygen lance to offset part of the nitrogen blowing pressure. During the smelting process, the converter generates an upward airflow with high intensity, which will exceed the nitrogen pressure after the nitrogen sealing plug is ejected and attenuated, thereby causing smoke and dust overflow.

[0004] The utility model attempts to solve the above problems and proposes a sealing device for the oxygen lance mouth of a converter. By arranging a first blowing ring and a second blowing ring, and by arranging a plurality of jet holes with special positions and angles on the inner walls of the first blowing ring and the second blowing ring, nitrogen enters the chamber between the nitrogen seal plug and the oxygen lance from the blowing holes, forming a spiral airflow with a certain pressure, which can better suppress the upward movement of smoke, reduce the smoke and dust dispersion effect, and improve the working environment. Utility Model Content

[0005] The utility model provides a sealing device for a converter oxygen lance mouth. By arranging a first blowing ring and a second blowing ring, and specifying the position angles of the connecting hole of a sliding through pipe and the blowing holes of the first blowing ring and the second blowing ring, an inert gas enters the blowing hole from the connecting hole and is then sprayed out from the blowing hole. The sprayed airflow is sprayed downward in a spiral and the sprayed nitrogen airflow is tangent to the outer wall of the oxygen lance, thereby reducing the air pressure loss of the nitrogen airflow directly blowing the outer wall of the oxygen lance, so that the sprayed nitrogen airflow has pressure, effectively preventing the converter smoke from overflowing upward, and improving the working environment.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a sealing device for a converter oxygen lance, comprising:

[0007] A shell, wherein the cross-sectional view of the shell is trapezoidal, the shell comprises a cover plate, an outer ring plate and a bottom plate, the outer ring plate is arranged between the cover plate and the bottom plate at a certain angle, and the outer ring plate is provided with a plurality of air inlet holes;

[0008] A sliding through pipe, wherein the cover plate and the bottom plate of the shell are connected to the outer wall of the sliding through pipe, and after the shell and the sliding through pipe are connected, the hollow portion is an annular cavity, and the sliding through pipe is provided with a connecting hole, and the connecting hole and the air inlet hole are respectively connected to the annular cavity; and

[0009] The sealing device of the converter oxygen lance mouth also includes a first blowing ring and a second blowing ring. The structure of the first blowing ring is the same as that of the second blowing ring. The first blowing ring and the second blowing ring are nested on the inner wall of the sliding through pipe. The first blowing ring is arranged close to the bottom plate, and the second blowing ring is arranged directly above the first blowing ring. The inner walls of the first blowing ring and the second blowing ring are provided with a plurality of blowing holes along the circumferential direction. The blowing holes are connected with the connecting holes. In the longitudinal section, the connecting holes and the blowing holes are inclined at a certain angle toward the bottom plate relative to the horizontal plane where the first blowing ring and the second blowing ring are located, and the blowing holes are inclined at a certain angle relative to the radial direction in the top view section of the first blowing ring and the second blowing ring.

[0010] Furthermore, the sealing device of the converter oxygen gun mouth also includes a third blow ring, the structure of the third blow ring is the same as the structure of the first blow ring and the second blow ring, the third blow ring is nested on the inner wall of the sliding pipe, the third blow ring is close to the cover plate, and the third blow ring is located directly above the second blow ring.

[0011] Furthermore, the sealing device of the converter oxygen lance port also includes an oxygen lance, the oxygen lance extends into the sliding passage, and the central axis of the oxygen lance coincides with the central axis of the hollow portion of the sliding passage.

[0012] Furthermore, the third blowing ring is provided with a plurality of the blowing holes, and the positions of the blowing holes provided on the third blowing ring are the same as the positions of the blowing holes provided on the first blowing ring and the second blowing ring.

[0013] Compared with the prior art, a sealing device for a converter oxygen lance mouth according to an embodiment of the utility model changes the position and angle arrangement of the connecting hole of the sliding through pipe and the blowing holes on the first blowing ring and the second blowing ring, so that the nitrogen gas flow is in a downward-blowing spiral airflow after being ejected from the blowing holes, thereby changing the original nitrogen gas flow direction and intensity, so that the nitrogen gas flow is tangent to the outer wall of the oxygen lance after being ejected through the blowing holes, avoiding the weakening of the gas flow intensity, and its spiral downward blowing airflow further prevents the smoke from rising at the bottom plate, thereby improving the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a sealing device for a converter oxygen lance in the prior art;

[0015] Figure 2 It is a schematic diagram of the overall structure of an oxygen lance assembled with a sealing device for a converter oxygen lance port according to the utility model;

[0016] Figure 3 This is a schematic diagram of the monomer structure of a sealing device for a converter oxygen lance port according to the utility model;

[0017] Figure 4 It is a longitudinal structure of the inner wall and a partial cross-sectional schematic diagram of a first blowing ring of a sealing device for a converter oxygen lance port according to the utility model; and

[0018] Figure 5 The utility model is a schematic diagram of a top view and a cross-sectional structure of a first blowing ring of a sealing device for a converter oxygen lance port.

[0019] Reference numerals:

[0020] 1. Shell; 101. Cover plate; 102. Outer ring plate; 103. Bottom plate;

[0021] 2. Inlet hole; 3. Sliding pipe; 4. Connecting hole; 5. Annular cavity; 6. First blowing ring; 7. Second blowing ring; 8. Third blowing ring; 9. Injection hole; 10. Oxygen gun; D1. Original nitrogen plug;

[0022] T1. The distance between the inner hole wall of the original nitrogen plug and the outer wall of the oxygen lance; T2. The distance between the inner wall of the sliding tube and the outer wall of the oxygen lance;

[0023] α1. The angle of inclination of the blowing hole relative to the radial direction; α2. The angle of inclination of the connecting hole and the blowing hole relative to the horizontal plane where the first blowing ring and the second blowing ring are located toward the bottom plate. DETAILED DESCRIPTION

[0024] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0025] like Figure 2 As shown, a sealing device for a converter oxygen gun mouth provided according to an embodiment of the utility model includes: a shell 1, the shell 1 is connected to an outer air intake assembly to introduce inert gas; a sliding pipe 3, the cavity enclosed by the shell 1 and the sliding pipe 3 is an annular cavity 5, the annular cavity 5 is used to store inert gas, and the sliding pipe 3 is provided with a plurality of connected connecting holes 4; a first blowing ring 6 and a second blowing ring 7, the first blowing ring 6 and the second blowing ring 7 have the same structure, and the first blowing ring 6 and the second blowing ring 7 are arranged on the inner wall of the sliding pipe 3, and the first blowing ring 6 and the second blowing ring 7 are provided with a plurality of blowing holes 9 along the circumferential direction, wherein one end of the blowing hole 9 is connected to the connecting hole 4, so that the inert gas is ejected from the connecting hole 4 and the blowing hole 9, thereby realizing the inert gas blocking of the inner wall space of the sliding pipe 3.

[0026] like Figure 2 and Figure 3 As shown, the shell 1 has a trapezoidal cross-sectional view, and the shell 1 includes a cover plate 101, an outer ring plate 102 and a bottom plate 103, wherein the outer ring plate 102 is arranged between the cover plate 101 and the bottom plate 103 at a certain angle, and the outer ring plate 102 is provided with a plurality of air inlet holes 2. The shell 1 has the functions of protecting the oxygen lance 10 and positioning the oxygen lance 10, and at the same time, the inert gas of the external air intake assembly enters through the air inlet hole 2 of the shell 1, while the bottom plate 103 is close to the converter, and the cover plate 101 is far away from the converter.

[0027] like Figure 3 As shown, the sliding tube 3 is a hollow tubular component, wherein the outer wall of the sliding tube 3 is connected to the cover plate 101 and the bottom plate 103 of the shell 1, so that after the shell 1 and the sliding tube 3 are connected, the hollow part is an annular cavity 5, wherein the cross-sectional structure of the annular cavity 5 is trapezoidal, and the tube wall of the sliding tube 3 is provided with a plurality of connected connecting holes 4, so that the connecting holes 4 are connected to the annular cavity 5, and the connecting holes 4 are inclined at a certain angle α2 relative to the horizontal plane where the second blowing ring 7 and the first blowing hole 6 are located to the bottom plate 103, so that the connecting holes 4 have a downward inclination, thereby reducing excessive resistance loss caused by direct gas blowing, and offsetting the rising smoke to limit the rising of the smoke.

[0028] like Figure 4 and Figure 5 As shown, the first blowing ring 6 and the second blowing ring 7 have the same structure. The first blowing ring 6 and the second blowing ring 7 are nested on the inner wall of the sliding tube 3, wherein the first blowing ring 6 is arranged close to the bottom plate 103 as the first line of defense to prevent smoke and dust from escaping, and the second blowing ring 7 is located directly above the first blowing ring 6 as the second line of defense to prevent smoke and dust from escaping. Figure 4As shown, the first blowing ring 6 and the second blowing ring 7 are located on the same central axis, and a plurality of connected blowing holes 9 are provided in the first blowing ring 6 and the second blowing ring 7, and one end of the blowing hole 9 is connected to the connecting hole 4 of the sliding passage 3, as shown in FIG. Figure 4 As shown, the blowing hole 9 is also inclined at a certain angle α2 toward the bottom plate 103 relative to the horizontal plane where the first blowing ring 6 and the second blowing ring 7 are located, so that the central axis of the blowing hole 9 coincides with the central axis of the connecting hole 4 to form a central axis, as shown in FIG. Figure 5 As shown, the injection holes 9 in the top view of the first injection ring 6 and the second injection ring 7 are inclined at a certain angle α1 relative to the radial direction, so that the injection airflow is spiral. After being ejected from the first injection ring 6 and the second injection ring 7, the inert gas is sprayed downward counterclockwise, and its airflow is tangent to the outer wall of the oxygen lance 10, thereby inhibiting the upward movement of the flue gas and greatly reducing the pressure loss caused by the inert gas airflow directly blowing the outer wall of the oxygen lance 10.

[0029] Further, such as Figure 2 As shown, the sealing device of the converter oxygen lance port further includes a third blowing ring 8, the structure of the third blowing ring 8 is the same as that of the first blowing ring 6 and the second blowing ring 7, and the third blowing ring 8 is nested on the inner wall of the sliding passage 3, the third blowing ring 8 is arranged close to the cover plate 101, and the third blowing ring 8 is arranged directly above the second blowing ring 7. The third blowing ring 8 is located at the sliding passage 3 close to the cover plate 101, so that the third blowing ring 8 serves as a third line of defense to prevent smoke and dust from escaping.

[0030] Further, such as Figure 1 and Figure 2 As shown, the sealing device of the converter oxygen lance port also includes an oxygen lance 10, which extends into the sliding tube 3, wherein the central axis of the oxygen lance 10 coincides with the central axis of the hollow part of the sliding tube 3, so that the oxygen lance 10 can freely move up and down at the center of the sliding tube 3 to complete the oxygen blowing process. In the oxygen blowing process, the distance from the inner wall of the sliding tube 3 to the outer wall of the oxygen lance 10 is T2, while the distance from the inner hole wall of the original nitrogen seal plug to the outer wall of the oxygen lance in the prior art is T1, wherein T2 is less than T1, so that the gap between the oxygen lance 10 and the sliding tube 3 is reduced, and the smoke and dust dispersion space is compressed.

[0031] Further, such as Figure 2 As shown, the third blowing ring 8 is provided with a plurality of blowing holes 9 at the same position angle as the first blowing ring 6 and the second blowing ring 7. The third blowing ring 8 is located close to the cover plate 101, so that the nitrogen spiral airflow sprayed by the third blowing ring 8 strengthens the nitrogen spiral airflow sprayed by the first blowing ring 6 and the second blowing ring 7, further preventing the smoke from rising.

[0032] Preferably, Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the distance T1 between the inner wall of the hollow circular ring of the original nitrogen sealing plug and the outer wall of the oxygen lance is 15 mm, the distance T2 between the inner wall of the sliding tube 3 and the outer wall of the oxygen lance 10 is 10 mm, the angle α1 of the relative radial inclination of the injection hole and the angle α2 of the connection hole and the injection hole relative to the horizontal plane where the first injection ring and the second injection ring are located toward the bottom plate are both 15 degrees. Among them, T2 is smaller than T1, and will not affect the normal rise and fall of the oxygen lance 10, so that the distance from the inner wall of the sliding tube 3 to the outer wall of the oxygen lance 10 is shortened, and the space for smoke and dust to escape is further reduced, and the angles of α1 and α2 can make the ejected nitrogen gas flow not contact the outer wall of the oxygen lance 10 while spraying downward.

[0033] In the present utility model, if Figure 2 and Figure 5 As shown, the external air intake assembly is connected to the shell 1, and its inert gas (such as nitrogen) is introduced by the external air intake assembly, enters and fills the annular chamber 5 through the air intake hole 2 of the outer ring side plate 102 of the shell 1, and waits for the annular chamber 5 to be filled with gas, and then the inert gas entering the annular chamber 5 will be ejected from the connecting hole 4 of the slide pipe 3 at a certain pressure, wherein the connecting hole 4 is connected with the first blowing ring 6, the second blowing ring 7 and the third blowing ring 8. The blowing hole 9 allows the inert gas to be ejected to the slide through the connecting hole 4 and the blowing hole 9. In the gap formed by the passage pipe 3 and the oxygen lance 10, the connecting hole 4 and the injection hole 9 both spray downward at an angle of α2, so that the airflow is downward and impacts the rising flue gas. At the same time, the injection hole 9 is inclined at α2 in the transverse section, so that the inert gas is sprayed downward in a spiral manner to further suppress the rising flue gas below. At the same time, the third injection ring 9 near the cover plate also sprays an inert gas flow, further strengthening the inert gas flow sprayed by the first injection ring 6 and the second injection ring 7, so that the inert gas is completely sealed to prevent the flue gas from rising.

[0034] According to a sealing device for a converter oxygen gun mouth according to an embodiment of the utility model, a shell and a sliding tube are provided, and the shell and the sliding tube form an annular cavity, and inert gas enters from the air inlet provided in the shell, and is first stored in the annular cavity. After the annular cavity is full, it is ejected from the connecting hole provided in the sliding tube, so that the inert gas ejected from the connecting hole has a certain pressure, thereby satisfying the inhibitory effect of a certain pressure. In the utility model, a first blowing ring, a second blowing ring and a third blowing ring are provided, and the first blowing ring, the second blowing ring and the third blowing ring are nested on the inner wall of the sliding tube, and the first blowing ring, the second blowing ring and the third blowing ring are provided with blowing holes, wherein the first blowing ring and the second blowing ring are connected to the connecting hole, so as to realize that the inert gas is ejected from the blowing hole into the gap between the sliding tube and the oxygen gun. In the utility model, the position angles of the connecting holes and the blowing holes are limited, wherein the connecting holes and the blowing holes are inclined at a certain angle toward the bottom plate in the longitudinal cross-sectional view, so that the direction of the airflow is obliquely downward, and the blowing holes are limited by being inclined at a certain angle in the radial direction, so that the blowing holes have a counterclockwise rotation direction, so that the airflow ejected from the latter blowing holes of the first blowing ring, the second blowing ring and the third blowing ring accelerates the airflow ejected from the previous blowing hole, thereby forming a spiral airflow, and continuously and forcefully blowing downward. In the utility model, by setting the third blowing ring directly above the second blowing ring, the third blowing ring is close to the position of the cover plate, wherein the third blowing ring has the same structure as the first blowing ring and the second blowing ring, and has the same angle of the blowing holes, further strengthening the airflow intensity of the inert gas between the inner wall of the sliding pipe and the outer wall of the oxygen gun, and greatly increasing the working efficiency of the first blowing ring and the second blowing ring.

[0035] In the description of the present invention, it is necessary to understand that the terms “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A sealing device for a converter oxygen lance, comprising: A shell, wherein the cross-sectional view of the shell is trapezoidal, the shell comprises a cover plate, an outer ring plate and a bottom plate, the outer ring plate is arranged between the cover plate and the bottom plate at a certain angle, and the outer ring plate is provided with a plurality of air inlet holes; A sliding through pipe, wherein the cover plate and the bottom plate of the shell are connected to the outer wall of the sliding through pipe, and after the shell and the sliding through pipe are connected, the hollow portion is an annular cavity, and the sliding through pipe is provided with a connecting hole, and the connecting hole and the air inlet hole are respectively connected to the annular cavity; It is characterized in that the sealing device of the converter oxygen gun mouth also includes a first blowing ring and a second blowing ring, the structure of the first blowing ring is the same as that of the second blowing ring, the first blowing ring and the second blowing ring are nested on the inner wall of the sliding through pipe, the first blowing ring is arranged close to the bottom plate, and the second blowing ring is arranged directly above the first blowing ring, and the inner walls of the first blowing ring and the second blowing ring are provided with a plurality of blowing holes along the circumferential direction, the blowing holes are connected with the connecting holes, and the connecting holes and the blowing holes are inclined at a certain angle toward the bottom plate relative to the horizontal plane where the first blowing ring and the second blowing ring are located in the longitudinal section, and the blowing holes are inclined at a certain angle relative to the radial direction in the top view section of the first blowing ring and the second blowing ring.

2. The sealing device for the converter oxygen lance according to claim 1, characterized in that: It also includes a third blow ring, the structure of the third blow ring is the same as the structure of the first blow ring and the second blow ring, the third blow ring is nested on the inner wall of the sliding tube, the third blow ring is arranged close to the cover plate, and the third blow ring is located directly above the second blow ring.

3. The sealing device for the converter oxygen lance according to claim 1, characterized in that: It also includes an oxygen lance, which extends into the sliding tube, and the central axis of the oxygen lance coincides with the central axis of the hollow part of the sliding tube.

4. The sealing device for the converter oxygen lance according to claim 2, characterized in that: The third blowing ring is provided with a plurality of the blowing holes, and the positions of the blowing holes provided in the third blowing ring are the same as the positions of the blowing holes provided in the first blowing ring and the second blowing ring.

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