Nitrogen sealing device for oxygen lance of converter

Abstract

The utility model relates to a nitrogen sealing device for a converter oxygen lance, and belongs to the technical field of converter steelmaking equipment in the metallurgical industry. According to the technical scheme, the device comprises a conical disc (1) and a nitrogen sealing base (4), the conical disc (1) is of a hollow structure matched with an oxygen lance, the outer surface of the lower portion of the conical disc (1) is conical, and a circular seam (3) is formed in the lower portion of the conical disc (1) in the circumferential direction; the nitrogen sealing base (4) is provided with a conical hole matched with the conical disc (1), the conical disc (1) is arranged in the conical hole of the nitrogen sealing base (4), an annular nitrogen chamber (5) is arranged in the circumferential direction of the nitrogen sealing base (4), and the annular nitrogen chamber (5) is provided with two oppositely-arranged air inlet holes (6) and a plurality of air outlet holes (7) matched with the circular seam (3). The utility model has the beneficial effects that the sealing effect is good, the smoke can be effectively prevented from overflowing, and the nitrogen consumption is reduced.

Description

Technical Field

[0001] The utility model relates to a nitrogen sealing device for a converter oxygen lance, belonging to the technical field of converter steelmaking equipment in the metallurgical industry. Background Art

[0002] The oxygen lances of many converter manufacturers use a sealing method that combines a cone disk and a nitrogen sealing seat. Due to the unreasonable setting of the cone disk and the nitrogen sealing seat, the oxygen lance shakes during the blowing process, causing a large gap between the cone disk and the nitrogen sealing seat, affecting the sealing effect. In addition, when dealing with slag sticking to the oxygen lance, it is easy to block the air outlet of the nitrogen sealing seat. As a result, there is serious smoke overflow at the production site, the CO concentration exceeds the standard, and the nitrogen consumption is high. Utility Model Content

[0003] The utility model aims to provide a nitrogen sealing device for a converter oxygen lance, which has good sealing effect, can effectively prevent smoke from overflowing, reduce nitrogen consumption, and solve the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A nitrogen sealing device for a converter oxygen lance comprises a conical disc and a nitrogen sealing seat, wherein the conical disc is a hollow structure matched with the oxygen lance, the outer surface of the lower part of the conical disc is conical, and an annular gap is provided in the circumferential direction of the lower part of the conical disc; the nitrogen sealing seat is provided with a conical hole matched with the conical disc, the conical disc is arranged in the conical hole of the nitrogen sealing seat, an annular nitrogen chamber is provided in the circumferential direction of the nitrogen sealing seat, and the annular nitrogen chamber is provided with two oppositely arranged air inlet holes and a plurality of air outlet holes matched with the annular gap.

[0006] The gas outlet holes of the annular nitrogen chamber matched with the annular gap are arranged to be inclined downward.

[0007] The downwardly inclined angle β of the gas outlet hole matched with the annular nitrogen chamber and the annular gap is 10-15 degrees.

[0008] The annular gap in the circumferential direction of the lower part of the cone disc is inclined upward.

[0009] The width of the annular gap in the circumferential direction of the lower part of the cone disk is greater than the diameter of the air outlet.

[0010] The angle α between the conical outer surface at the lower part of the cone disk and the horizontal plane is 10-20 degrees.

[0011] The beneficial effects of the utility model are: good sealing effect, being able to effectively prevent smoke from overflowing and reducing nitrogen consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the cone disk of the utility model;

[0013] Figure 2This is a schematic diagram of the nitrogen sealing seat of the utility model;

[0014] Figure 3 It is a schematic diagram of the structure of the utility model;

[0015] In the figure: cone disk 1, sealing chamber 2, annular gap 3, nitrogen sealing seat 4, nitrogen chamber 5, air inlet 6, air outlet 7. DETAILED DESCRIPTION

[0016] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0017] See attached Figure 1 , 2 3. A nitrogen sealing device for a converter oxygen lance comprises a conical disk 1 and a nitrogen sealing seat 4. The conical disk 1 is a hollow structure matched with the oxygen lance. The outer surface of the lower part of the conical disk 1 is conical, and an annular gap 3 is provided in the circumferential direction of the lower part of the conical disk 1; the nitrogen sealing seat 4 is provided with a conical hole matched with the conical disk 1, the conical disk 1 is arranged in the conical hole of the nitrogen sealing seat 4, and an annular nitrogen chamber 5 is provided in the circumferential direction of the nitrogen sealing seat 4, and the annular nitrogen chamber 5 is provided with two oppositely arranged air inlet holes 6 and a plurality of air outlet holes 7 matched with the annular gap 3.

[0018] In this embodiment, refer to the attached Figure 1 , 3 The angle α between the conical outer surface of the lower part of the cone disk 1 and the horizontal plane is 10-20 degrees, which can make the oxygen lance replacement and the cone disk seat 4 cooperate more closely and reduce the overflow of flue gas caused by the shaking of the oxygen lance during the blowing process.

[0019] See attached Figure 2 , 3 Air is introduced through the air inlet holes 6 on both sides of the nitrogen sealing seat 4, so that the pressure in the annular sealing chamber 5 of the nitrogen sealing seat 4 is uniform, and protection is more effective.

[0020] The width of the annular gap 3 is greater than the diameter of the air outlet 7, and the air outlet 7 is arranged to be tilted downward, while the annular gap 3 is tilted upward. This arrangement can effectively prevent the air outlet 7 from being blocked during the oxygen gun cleaning process, and at the same time, the air outlet 7 forms an air curtain with a downward angle, so that the flue gas has downward pressure, which can effectively prevent the flue gas from overflowing.

Claims

1. A nitrogen sealing device for a converter oxygen lance, characterized in that: The invention comprises a cone disk (1) and a nitrogen sealing seat (4), wherein the cone disk (1) is a hollow structure matched with an oxygen gun, the outer surface of the lower part of the cone disk (1) is conical, and an annular slit (3) is provided in the circumferential direction of the lower part of the cone disk (1); the nitrogen sealing seat (4) is provided with a conical hole matched with the cone disk (1), the cone disk (1) is arranged in the conical hole of the nitrogen sealing seat (4), and an annular nitrogen chamber (5) is provided in the circumferential direction of the nitrogen sealing seat (4), and the annular nitrogen chamber (5) is provided with two oppositely arranged air inlet holes (6) and a plurality of air outlet holes (7) matched with the annular slit (3).

2. A converter oxygen lance nitrogen sealing device according to claim 1, characterized in that: The annular nitrogen chamber (5) and the gas outlet hole (7) matched with the annular gap (3) are arranged to be inclined downward.

3. A nitrogen sealing device for a converter oxygen lance according to claim 2, characterized in that: The gas outlet hole (7) matched with the annular nitrogen chamber (5) and the annular gap (3) is inclined downward at an angle β of 10-15 degrees.

4. A nitrogen sealing device for a converter oxygen lance according to claim 3, characterized in that: The annular gap (3) in the circumferential direction of the lower part of the conical disk (1) is inclined upward.

5. A nitrogen sealing device for a converter oxygen lance according to claim 4, characterized in that: The width of the annular gap (3) in the circumferential direction of the lower part of the cone disk (1) is greater than the diameter of the air outlet hole (7).

6. The nitrogen sealing device for a converter oxygen lance according to claim 1, characterized in that: The angle α between the conical outer surface of the lower part of the cone disk (1) and the horizontal plane is 10-20 degrees.

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