Device for improving sealing effect of oxygen lance opening of converter

Abstract

The utility model discloses a device for improving the sealing effect of a converter oxygen lance muzzle, which comprises a hollow nitrogen sealing seat connected to an oxygen lance muzzle base body, the outer wall of the nitrogen sealing seat is connected with a high-pressure steam inlet pipe, the inner wall of the nitrogen sealing seat is provided with a plurality of nitrogen sealing seat air outlets, the inner side of the nitrogen sealing seat is provided with a nitrogen sealing plug, and the nitrogen sealing plug is connected with a high-pressure steam outlet pipe. The oxygen lance body is sleeved with the nitrogen sealing plug, the nitrogen sealing plug is hollow, a plurality of nitrogen sealing plug air inlet holes are formed in the outer wall of the nitrogen sealing plug, and nitrogen sealing plug annular air outlet holes are formed in the inner wall of the nitrogen sealing plug; a dust removal assembly is arranged on one side of the nitrogen sealing base. Steam flows into the gap between the nitrogen sealing plug and the outer wall of the oxygen lance body through the annular air outlet of the nitrogen sealing plug, an annular steam sealing effect is formed by utilizing a siphon effect formed in the inclination angle direction and high-pressure steam pressure, smoke is prevented from overflowing, the dust removal cover is arranged on one side of the oxygen lance body, smoke or dust is prevented from diffusing and overflowing, and the service life of the oxygen lance is prolonged. The converter gas recovery amount is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, in particular to a device for improving the sealing effect of a converter oxygen gun mouth. Background Art

[0002] Oxygen blowing is an important process in converter steelmaking. The so-called blowing is the process of using an oxygen lance to spray high-pressure, high-speed industrial pure oxygen onto the surface of the molten crude metal to oxidize the impurities into gases (such as carbon monoxide and sulfur dioxide) and escape, thereby obtaining a purer metal.

[0003] During blowing, the oxygen lance needs to pass through the oxygen lance mouth from top to bottom and then extend into the converter. A large amount of high-temperature flue gas and dust will be generated during blowing in the steelmaking converter. Most of the flue gas and dust will be sucked away by the primary dust removal fan, and a small amount will overflow from the poorly sealed area when the pressure changes. In order to prevent the oxygen lance from shaking significantly and a large amount of flue gas and dust from overflowing from the oxygen lance mouth, polluting the surrounding environment on site, most steel mills will design a nitrogen-sealed inner cone sleeve base at the nitrogen sealing port. By using a nitrogen sealing plug, a nitrogen sealing layer is formed, thereby preventing the oxygen lance from shaking and a large amount of flue gas and dust from overflowing under the large reaction force generated by the injection airflow, reducing the impact of flue gas and dust on the environment during the blowing process.

[0004] The nitrogen sealing principle of the traditional converter oxygen gun mouth is: when nitrogen enters the inner cavity of the nitrogen seal seat and passes through the annular hole on the inner wall of the nitrogen seal cone, the gap between the nitrogen seal seat and the nitrogen seal plug is sealed. However, the nitrogen sealing structure has the following defects: 1. There is no effective seal between the nitrogen plug and the oxygen gun, causing a large amount of flue gas and dust to overflow, and at the same time, air is sucked into the flue to form secondary combustion, which reduces the gas concentration and affects the converter gas recovery; 2. The nitrogen sealing method is not reliable enough and often fails to achieve a complete sealing effect, causing some flue gas and dust to overflow, especially during the intense carbon-oxygen reaction, the oxygen gun shakes greatly, and the flue gas and dust overflow is more serious. The main component of the flue gas is unburned CO, which poses a great safety hazard to normal safe production and fails to meet environmental protection requirements; 3. The nitrogen sealing method generally has the problem of high nitrogen consumption, which increases production costs. Utility Model Content

[0005] The utility model aims to provide a device for improving the sealing effect of the oxygen lance mouth of a converter, so as to solve the above-mentioned problem.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model relates to a device for improving the sealing effect of the oxygen lance nozzle of a converter, which comprises a nitrogen seal seat connected to the matrix of the oxygen lance nozzle. The interior of the nitrogen seal seat is hollow. A high-pressure steam inlet pipe is connected to the outer wall of the nitrogen seal seat. A plurality of nitrogen seal seat air outlet holes are formed in the inner wall of the nitrogen seal seat. A nitrogen seal plug is arranged inside the nitrogen seal seat. The nitrogen seal plug is sleeved on the oxygen lance body. The nitrogen seal plug is hollow. A plurality of nitrogen seal plug air inlet holes are formed in the outer wall of the nitrogen seal plug. A nitrogen seal plug annular air outlet hole is formed in the inner wall of the nitrogen seal plug. A dust removal assembly is arranged on one side of the nitrogen seal seat.

[0008] Further, the nitrogen seal seat is connected to the matrix of the oxygen lance nozzle through a flange and bolts.

[0009] Further, the nitrogen seal seat is provided with upper, middle and lower layers. A plurality of the nitrogen seal seat air outlet holes are formed in the upper, middle and lower layers of the nitrogen seal seat.

[0010] Further, the inner wall of the nitrogen seal seat is in a flared shape with the bottom diameter smaller than the top diameter.

[0011] Further, the nitrogen seal seat air outlet holes, the nitrogen seal plug air inlet holes and the nitrogen seal plug annular air outlet hole are all inclined, and the inclined angle is 30°.

[0012] Further, the nitrogen seal plug air inlet holes are provided with upper and lower layers. 14 nitrogen seal plug air inlet holes are formed in the upper layer, and the diameter is 10 cm. 4 nitrogen seal plug air inlet holes are formed in the lower layer, and the diameter is 15 cm.

[0013] Further, the dust removal assembly includes a dust removal hood arranged on one side of the matrix of the oxygen lance nozzle. A dust removal pipe is connected to the dust removal hood. The other end of the dust removal pipe is connected to a suction fan. The other end of the suction fan is connected to a collection box.

[0014] Further, the dust removal hood is 1.5 m away from the matrix of the oxygen lance nozzle.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0016] In the utility model, steam is introduced into the nitrogen seal seat through the high-pressure steam inlet pipe. Then the steam flows into the gap between the inner wall of the nitrogen seal seat and the outer wall of the nitrogen seal plug through the upper, middle and lower layers of nitrogen seal seat air outlet holes. Then the steam flows into the inside of the nitrogen seal plug through the upper and lower layers of nitrogen seal plug air inlet holes to form a sealed high-pressure gas storage chamber. Then the steam flows into the gap between the nitrogen seal plug and the outer wall of the oxygen lance body through the nitrogen seal plug annular air outlet hole. By using the siphon effect and the high-pressure steam pressure formed in the inclined angle direction, an annular steam sealing effect is formed to block the overflow of flue gas. And a dust removal hood is arranged on one side of the oxygen lance body to prevent the diffusion and overflow of flue gas or dust, and improve the recovery amount of converter gas. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a cross-sectional view of the device for improving the sealing effect of the oxygen lance nozzle of the converter of the present utility model;

[0019] Explanation of reference numerals in the drawings: 1. Oxygen lance nozzle base; 2. Nitrogen seal seat; 3. High-pressure steam inlet pipe; 4. Nitrogen seal seat air outlet; 5. Nitrogen seal plug; 6. Oxygen lance body; 7. Nitrogen seal plug air inlet; 8. Nitrogen seal plug annular air outlet; 9. Flange; 10. Bolt; 11. Dust removal hood; 12. Dust removal pipe. Specific embodiments

[0020] As Figure 1 shown, a device for improving the sealing effect of the oxygen lance nozzle of a converter includes a nitrogen seal seat 2 connected to the oxygen lance nozzle base 1, and the nitrogen seal seat 2 is connected to the oxygen lance nozzle base 1 through a flange 9 and bolts 10.

[0021] The interior of the nitrogen seal seat 2 is hollow, and the inner wall of the nitrogen seal seat 2 is in a flared shape with a bottom diameter smaller than the top diameter. A high-pressure steam inlet pipe 3 is connected to the outer wall of the nitrogen seal seat 2, and a plurality of nitrogen seal seat air outlets 4 are opened on the inner wall of the nitrogen seal seat 2. The nitrogen seal seat 2 has upper, middle, and lower layers, and a plurality of the nitrogen seal seat air outlets 4 are opened on the upper, middle, and lower layers of the nitrogen seal seat 2. A nitrogen seal plug 5 is provided inside the nitrogen seal seat 2, and the nitrogen seal plug 5 is sleeved on the oxygen lance body 6. The nitrogen seal plug 5 is hollow, and a plurality of nitrogen seal plug air inlets 7 are opened on the outer wall of the nitrogen seal plug 5. The nitrogen seal plug air inlets 7 are opened in two upper and lower layers. There are 14 nitrogen seal plug air inlets 7 in the upper layer, with a diameter of 10 cm, and 4 nitrogen seal plug air inlets 7 in the lower layer, with a diameter of 15 cm. A nitrogen seal plug annular air outlet 8 is opened on the inner wall of the nitrogen seal plug 5.

[0022] The nitrogen seal seat air outlets 4, the nitrogen seal plug air inlets 7, and the nitrogen seal plug annular air outlets 8 are all inclined, and the inclination angle is 30°.

[0023] A dust removal assembly is provided on one side of the nitrogen seal seat 2. The dust removal assembly includes a dust removal hood 11 provided on one side of the oxygen lance nozzle base 1. The dust removal hood 11 is 1.5 m away from the oxygen lance nozzle base 1. A dust removal pipe 12 is connected to the dust removal hood 11, and the other end of the dust removal pipe 12 is connected to a suction fan, and the other end of the suction fan is connected to a collection box.

[0024] The operation process of the present utility model is as follows:

[0025] During use, steam enters the nitrogen seal seat 2 through the high-pressure steam inlet pipe 3. The high-pressure steam in the nitrogen seal seat 2 is obliquely ejected through the nitrogen seal seat air outlet holes into the gap between the nitrogen seal seat 2 and the nitrogen seal plug 5 to form an annular steam seal. Then the high-pressure steam enters the nitrogen seal plug 5 through the nitrogen seal plug air inlet hole 7. After that, the steam in the nitrogen seal plug 5 is ejected through the nitrogen seal plug annular air outlet holes 8 into the gap between the nitrogen seal plug 5 and the oxygen lance body 6 to form an annular steam seal, improving the effect of the steam seal and reducing or eliminating the phenomenon of smoke emission at the oxygen lance mouth of the converter. When there is a small amount of flue gas and dust overflowing, the small amount of overflowing flue gas is sucked away by the dust removal hood 11 and the dust removal pipeline, completely eliminating the phenomenon of smoke emission at the oxygen lance mouth of the converter.

[0026] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for improving the sealing effect of the oxygen lance nozzle of a converter, characterized in that: It includes a nitrogen seal seat (2) connected to the oxygen lance nozzle base body (1). The inside of the nitrogen seal seat (2) is hollow. A high-pressure steam inlet pipe (3) is connected to the outer wall of the nitrogen seal seat (2). A number of nitrogen seal seat air outlet holes (4) are provided on the inner wall of the nitrogen seal seat (2). A nitrogen seal plug (5) is arranged inside the nitrogen seal seat (2). The nitrogen seal plug (5) is sleeved on the oxygen lance body (6). The nitrogen seal plug (5) is hollow. A number of nitrogen seal plug air inlet holes (7) are provided on the outer wall of the nitrogen seal plug (5). A nitrogen seal plug annular air outlet hole (8) is provided on the inner wall of the nitrogen seal plug (5); A dust removal assembly is arranged on one side of the nitrogen seal seat (2).

2. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The nitrogen seal seat (2) is connected to the oxygen lance nozzle base body (1) through a flange (9) and bolts (10).

3. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The nitrogen seal seat (2) has upper, middle and lower layers. A number of the nitrogen seal seat air outlet holes (4) are provided on the upper, middle and lower layers of the nitrogen seal seat (2).

4. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The inner wall of the nitrogen seal seat (2) is in a flared shape with the bottom diameter smaller than the top diameter.

5. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The nitrogen seal seat air outlet holes (4), the nitrogen seal plug air inlet holes (7) and the nitrogen seal plug annular air outlet holes (8) are all obliquely arranged, and the oblique angle of arrangement is 30°.

6. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The nitrogen seal plug air inlet holes (7) are arranged in upper and lower layers. There are 14 nitrogen seal plug air inlet holes (7) in the upper layer, and the diameter is 10 cm. There are 4 nitrogen seal plug air inlet holes (7) in the lower layer, and the diameter is 15 cm.

7. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 1, characterized in that: The dust removal assembly includes a dust removal hood (11) arranged on one side of the oxygen lance nozzle base body (1). A dust removal pipe (12) is connected to the dust removal hood (11). The other end of the dust removal pipe (12) is connected to a suction fan, and the other end of the suction fan is connected to a collection box.

8. The device for improving the sealing effect of the oxygen lance nozzle of a converter according to claim 7, characterized in that The dust removal hood (11) is 1.5 m away from the oxygen lance nozzle base body (1).

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