Bottom spray gun for converter

Abstract

The utility model relates to a bottom spray gun for a converter, which comprises a spray pipe and a switching component, the spray pipe is used for extending into the converter, the tail of the spray pipe is connected with the switching component, the spray pipe comprises an outer pipe and an inner pipe sleeved in the outer pipe, and a gap between the inner pipe and the outer pipe forms a cooling gas channel. A cooling air inlet pipe is arranged on the switching assembly and communicated with the cooling air channel, and the tail of the inner pipe is used for being connected with a high-pressure oxygen source. According to the bottom spray gun for the converter, the spray pipe is buried in the refractory material and is burnt out along with consumption of the refractory material, natural gas or nitrogen passes through the gap between the inner pipe and the outer pipe to play a role in cooling the spray pipe, the spray pipe is prevented from being directly melted by the temperature of molten iron, and the service life of the bottom spray gun is prolonged.

Description

Technical Field

[0001] The utility model relates to parts or auxiliary equipment for carbon steel smelting, in particular to a bottom spray gun for a converter. Background Art

[0002] The oxygen lance is one of the main process equipment in oxygen converter steelmaking, which controls the contact area between the oxygen jet and the molten pool, the penetration depth of the oxygen jet, the stirring state of the molten pool, the oxidation degree of the elements, the heating rate of the molten pool, the iron oxide content in the slag, and other important process factors. The bottom blowing process of the converter greatly improves the stirring conditions of the converter molten pool, reduces the oxidizability of the slag and metal, and the slag-steel reaction is close to the equilibrium state. Carbon can be removed to the low-carbon field without increasing the (FeO) in the slag, which is suitable for mass production of low-carbon steel grades.

[0003] The bottom blowing process requires a bottom spray gun. The nozzle of the bottom spray gun is buried in the refractory of the converter to supply oxygen or lime (calcium oxide powder) into the converter. Due to the high temperature in the furnace, the nozzle needs to be cooled, otherwise the molten iron will quickly melt the nozzle. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a bottom spray gun for a converter to improve the service life of the converter.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] A bottom spray gun for a converter, whose key technology lies in: a nozzle and a adapter assembly used to extend into the interior of the converter, the tail of the nozzle being connected to the adapter assembly, the nozzle comprising an outer tube and an inner tube sleeved inside the outer tube, the gap between the inner tube and the outer tube forming a cooling gas channel, a cooling air inlet pipe being provided on the adapter assembly, the cooling air inlet pipe being communicated with the cooling gas channel, and the tail of the inner tube being used for connecting a high-pressure oxygen source.

[0007] As an implementation mode of the utility model, a support assembly for maintaining a gap between the inner tube and the outer tube is provided between the inner tube and the outer tube.

[0008] As an embodiment of the utility model, the support assembly is a plurality of evenly distributed ridges, the extension direction of the ridges is consistent with the axial direction of the nozzle, and the ridges are fixed on the inner wall of the outer tube and / or the outer wall of the inner tube.

[0009] As an embodiment of the utility model, the adapter assembly includes a cooling air inlet connecting seat and an oxygen inlet connecting seat for being fixedly connected to the furnace bottom, the cooling air inlet connecting seat is fixedly connected to the tail of the outer tube, an annular cavity is arranged inside the cooling air inlet connecting seat, a cooling air inlet port is arranged on the side wall of the cooling air inlet connecting seat, the cooling air inlet pipe is fixedly connected to the cooling air inlet connecting seat through the cooling air inlet port; the tail of the inner tube passes through the cooling air inlet connecting seat and is fixedly connected to the oxygen inlet connecting seat.

[0010] As an implementation manner of the utility model, the oxygen inlet connection seat and the inner tube are fixedly connected by an expansion sleeve.

[0011] As an embodiment of the utility model, it also includes a furnace bottom connecting seat and a transition connecting seat, the adapter assembly is connected to the furnace bottom through the furnace bottom connecting seat, the furnace bottom connecting seat is provided with a first flange, and the transition connecting seat is provided with a second flange, the first flange and the second flange are fixedly connected by a first bolt, so that the transition connecting seat, the oxygen inlet connecting seat and the cooling air inlet connecting seat are fixedly connected to the furnace bottom connecting seat.

[0012] As an implementation manner of the present utility model, the cooling air intake connection seat and the oxygen intake connection seat are fixedly connected by a second bolt.

[0013] As an embodiment of the utility model, it also includes an oxygen inlet pipe assembly, which includes an elbow with one end connected to the tail of the inner pipe, and the other end of the elbow is connected to the oxygen inlet interface, and the axis of the oxygen inlet interface is perpendicular to the axis of the nozzle.

[0014] As an implementation mode of the utility model, a first ball head is fixedly provided at the other end of the elbow, the first ball head is connected to a second ball head through a connecting pipe arranged to be inclined upward, and the oxygen inlet interface is provided on the second ball head.

[0015] As an implementation manner of the utility model, an observation window is provided on the elbow, and the observation window corresponds to the inner tube.

[0016] The beneficial effects of adopting the above technical solution are:

[0017] The utility model provides a bottom spray gun for a converter, the nozzle is buried in the refractory material, and burns out as the refractory material is consumed. Natural gas or nitrogen passes through the gap between the inner and outer tubes to cool the nozzle, thereby preventing the molten iron temperature from directly melting the nozzle and improving the service life of the bottom spray gun. Since the nozzle is relatively long (about 2 meters), a support component is set in the gap between the inner and outer tubes to maintain the annular gap between the inner and outer tubes, so that the gap between the inner and outer tubes remains uniform, thereby ensuring that the cooling gas at each position in the gap is evenly distributed, and ensuring the cooling effect of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 It is a partial structural schematic diagram of the utility model.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the nozzle in Example 1.

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the nozzle in Example 2.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the nozzle in Example 3.

[0023] Figure 6 It is a schematic diagram of the outer tube structure in Example 4.

[0024] Wherein: 1 nozzle, 1-1 outer tube, 1-2 inner tube, 1-3 convex ridge, 2 furnace bottom connecting seat, 3 first flange, 4 first bolt, 5 cooling air inlet connecting seat, 5-1 cooling air inlet, 6 oxygen inlet connecting seat, 7 cooling air inlet pipe, 8 sealing plate, 9 second flange, 10 transition connecting seat, 11 elbow, 12 observation window, 13 first ball head, 14 connecting pipe, 15 second ball head, 16 oxygen inlet interface, 17 fixed connecting block, 18 expansion sleeve, 19 sealing ring, 20 second bolt, 21 sealing gasket, 200 converter bottom. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model is clearly and completely described below in conjunction with specific embodiments.

[0026] like Figure 1 and 2 A bottom spray gun for a converter is shown, which includes an adapter assembly for fixedly connecting to the bottom 200 of the converter, an oxygen inlet pipe assembly connected to the adapter assembly, and a spray pipe 1 for extending into the interior of the converter. The oxygen inlet pipe assembly is used to connect to a high-pressure oxygen source, and the high-pressure oxygen source introduces high-pressure oxygen or lime (calcium oxide) into the oxygen inlet pipe assembly. This embodiment also includes a furnace bottom connecting seat 2, and the adapter assembly is fixedly connected to the bottom 200 of the converter via the furnace bottom connecting seat 2.

[0027] The tail of the nozzle 1 is fixed between the furnace bottom connection seat 2 and the adapter assembly. The nozzle 1 extends vertically upward from the furnace bottom connection seat 2 to the inside of the converter, and its length is about 2 meters.

[0028] like Figures 3 to 5As shown, the nozzle 1 includes an outer tube 1-1 and an inner tube 1-2 sleeved in the outer tube 1-1, the gap between the inner tube 1-2 and the outer tube 1-1 forms an annular cooling gas channel, the adapter assembly is provided with a cooling air intake pipe 7, the cooling air intake pipe 7 is communicated with the cooling gas channel, the tail of the inner tube 1-2 is used to connect to a high-pressure oxygen source, in this embodiment, the tail of the inner tube 1-2 is connected to the oxygen intake pipe assembly, and the high-pressure oxygen source is connected through the oxygen intake pipe assembly.

[0029] A support assembly is provided between the inner tube 1-2 and the outer tube 1-1 for maintaining the gap between the inner tube 1-2 and the outer tube 1-1. Since the nozzle 1 is relatively long, it is inevitable that it will bend and deform when it is inserted into the converter and during use. The support assembly can keep the gap between the inner tube 1-2 and the outer tube 1-1 uniform and unobstructed, which increases the strength of the nozzle 1 on the one hand and ensures uniform distribution of the cooling gas on the other hand.

[0030] The supporting assembly is a plurality of evenly distributed ridges 1-3, the extension direction of the ridges 1-3 is consistent with the axial direction of the nozzle 1, and the ridges 1-3 are fixed on the inner wall of the outer tube 1-1 and / or the outer wall of the inner tube 1-2.

[0031] like Figure 3 The example 1 of the arrangement of the convex ribs 1-3 is shown, wherein the convex ribs 1-3 are 6 in number and are arranged in a circular array on the inner wall of the outer tube 1-1.

[0032] like Figure 4 The example 2 of the arrangement of the convex ribs 1-3 is shown, wherein the convex ribs 1-3 are 6 in number and are arranged in a circular array on the outer wall of the inner tube 1-2.

[0033] like Figure 5 The example 3 of the convex ribs 1-3 is shown, wherein there are 6 convex ribs 1-3, three of which are arranged in circular arrays on the inner wall of the outer tube 1-1, and the other three are arranged in circular arrays on the outer wall of the inner tube 1-2, and the convex ribs on the inner tube and the outer tube are cross-distributed.

[0034] Figures 3 to 5 The convex ridges 1-3 shown are all continuous extension structures with the same length as the outer tube 1-1.

[0035] like Figure 6 Another embodiment of the arrangement of the convex ribs 1-3 is shown, wherein the convex ribs 1-3 are arranged in a plurality of groups, and the plurality of groups of convex ribs 1-3 are evenly distributed along the axial direction of the nozzle, that is, the convex ribs 1-3 are discontinuous structures extending discontinuously. Each group includes 6 convex ribs 1-3, and the 6 convex ribs 1-3 are arranged in a circular array on the inner wall of the outer tube 1-1. As an equivalent alternative form, in this embodiment, the convex ribs can also be arranged on the outer wall of the inner tube 1-2, or respectively arranged on the inner wall of the outer tube 1-1 and the outer wall of the inner tube 1-2.

[0036] like Figures 3 to 6 As shown in the figure, the number of convex ribs 1-3 is 6. As an equivalent alternative, the number of convex ribs 1-3 can also be 3 to 5 or more than 6. The cross section of the convex rib can be rectangular, body-shaped, triangular or arc-shaped.

[0037] like Figure 2 As shown, the adapter assembly includes a cooling air inlet connection seat 5 and an oxygen inlet connection seat 6 fixedly connected to the furnace bottom connection seat 2 , and the cooling air inlet connection seat 5 and the oxygen inlet connection seat 6 are fixedly connected by a second bolt 20 .

[0038] The cooling air inlet connection seat 5 is fixedly connected to the tail of the outer tube 1-1 by welding, an annular cavity is arranged inside the cooling air inlet connection seat 5, a cooling air inlet port 5-1 is arranged on the side wall of the cooling air inlet connection seat 5, the cooling air inlet pipe 7 is fixedly connected to the cooling air inlet connection seat 5 through the cooling air inlet port 5-1, the annular cavity connects the cooling air inlet pipe 7 and the cooling gas channel, and the annular cavity plays a role in uniformly distributing the cooling gas. A sealing gasket 21 is arranged between the top of the cooling air inlet connection seat 5 and the furnace bottom connection seat 2.

[0039] The tail of the inner tube 1-2 passes through the cooling air inlet connection seat 5 and is fixedly connected to the oxygen inlet connection seat 6. The oxygen inlet connection seat 6 and the inner tube 1-2 are fixedly connected via an expansion sleeve 18. A sealing ring 19 is also provided between the oxygen inlet connection seat 6 and the inner tube 1-2.

[0040] This embodiment further includes a transition connection seat 10 , which is disposed between the adapter assembly and the oxygen inlet pipe assembly. A sealing plate 8 is disposed between the transition connection seat 10 and the oxygen inlet connection seat 6 .

[0041] A first flange 3 is provided on the furnace bottom connection seat 2, and a second flange 9 is provided on the transition connection seat 10. The first flange 3 and the second flange 9 are fixedly connected by a first bolt 4, so that the transition connection seat 10, the oxygen inlet connection seat 6 and the cooling air inlet connection seat 5 are fixedly connected to the furnace bottom connection seat 2.

[0042] In this embodiment, the furnace bottom connecting seat 2 is welded to the bottom 200 of the converter. The furnace bottom connecting seat 2 is tubular as a whole, and has a channel inside for the nozzle 1 to pass through. The furnace bottom connecting seat 2 is used to connect the adapter component. On the one hand, the adapter component fixes the bottom ports of the inner tube 1-2 and the outer tube 1-1 respectively, and also connects the inner tube 1-2 to the supply channel, and the cooling gas channel between the outer tube 1-1 and the inner tube 1-2 is connected to the cooling intake pipe 7.

[0043] like Figure 1As shown, the oxygen inlet pipe assembly includes an elbow 11 fixedly connected to the adapter assembly at one end, and the other end of the elbow 11 is connected to the oxygen inlet interface 16, and the axis of the oxygen inlet interface 16 is perpendicular to the axis of the nozzle 1. The nozzle 1 is vertically arranged, and the oxygen inlet interface 16 is horizontally arranged, which is convenient for connection with a high-pressure oxygen source. The angle of the elbow 11 is 90 degrees.

[0044] A first ball head 13 is fixedly provided at the other end of the elbow 11, and the first ball head 13 is connected to a second ball head 15 through a connecting pipe 14 arranged upwardly tilted, and the second ball head 15 is provided with the oxygen inlet interface 16. A fixed connection block 17 for fixing the ball heads is provided on both the first ball head 13 and the second ball head 15. An observation window 12 is provided on the elbow 11, and the observation window 12 corresponds to the inner tube 1-2.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bottom spray gun for a converter, characterized in that: A nozzle (1) and a transition assembly are provided for extending into the interior of a converter, wherein the tail of the nozzle (1) is connected to the transition assembly, the nozzle (1) comprises an outer tube (1-1) and an inner tube (1-2) sleeved inside the outer tube (1-1), a gap between the inner tube (1-2) and the outer tube (1-1) forming a cooling gas channel, the transition assembly is provided with a cooling air inlet pipe (7), the cooling air inlet pipe (7) is communicated with the cooling gas channel, and the tail of the inner tube (1-2) is used for connecting to a high-pressure oxygen source.

2. The bottom spray gun for a converter according to claim 1, characterized in that: A support component for maintaining a gap between the inner tube (1-2) and the outer tube (1-1) is provided between the inner tube (1-2) and the outer tube (1-1).

3. The bottom spray gun for a converter according to claim 2, characterized in that: The support assembly comprises a plurality of evenly distributed convex ridges (1-3), the extension direction of the convex ridges (1-3) being consistent with the axial direction of the nozzle (1), and the convex ridges (1-3) being fixedly arranged on the inner wall of the outer tube (1-1) and / or the outer wall of the inner tube (1-2).

4. The bottom spray gun for a converter according to claim 1, characterized in that: The adapter assembly comprises a cooling air inlet connection seat (5) and an oxygen inlet connection seat (6) for being fixedly connected to the furnace bottom, the cooling air inlet connection seat (5) being fixedly connected to the tail of the outer tube (1-1), an annular cavity being arranged inside the cooling air inlet connection seat (5), a cooling air inlet port (5-1) being arranged on the side wall of the cooling air inlet connection seat (5), the cooling air inlet pipe (7) being fixedly connected to the cooling air inlet connection seat (5) through the cooling air inlet port (5-1); the tail of the inner tube (1-2) passes through the cooling air inlet connection seat (5) and is fixedly connected to the oxygen inlet connection seat (6).

5. The bottom spray gun for converter according to claim 4, characterized in that: The oxygen inlet connection seat (6) and the inner tube (1-2) are fixedly connected via an expansion sleeve (18).

6. The bottom spray gun for converter according to claim 4, characterized in that: The invention also comprises a furnace bottom connection seat (2) and a transition connection seat (10), wherein the adapter assembly is connected to the furnace bottom via the furnace bottom connection seat (2), a first flange (3) is arranged on the furnace bottom connection seat (2), and a second flange (9) is arranged on the transition connection seat (10), and the first flange (3) and the second flange (9) are fixedly connected via a first bolt (4), so that the transition connection seat (10), the oxygen inlet connection seat (6) and the cooling air inlet connection seat (5) are fixedly connected to the furnace bottom connection seat (2).

7. A bottom spray gun for a converter according to any one of claims 4 to 6, characterized in that: The cooling air intake connection seat (5) and the oxygen intake connection seat (6) are fixedly connected by a second bolt (20).

8. The bottom spray gun for a converter according to claim 1, characterized in that: It also includes an oxygen inlet pipe assembly, the oxygen inlet pipe assembly including an elbow (11) having one end connected to the tail of the inner pipe (1-2), the other end of the elbow (11) being connected to an oxygen inlet interface (16), the axis of the oxygen inlet interface (16) being perpendicular to the axis of the nozzle (1).

9. A bottom spray gun for a converter according to claim 8, characterized in that: A first ball head (13) is fixedly provided at the other end of the elbow (11); the first ball head (13) is connected to a second ball head (15) via a connecting pipe (14) arranged to be inclined upward; and the second ball head (15) is provided with the oxygen inlet interface (16).

10. The bottom spray gun for converter according to claim 8, characterized in that: An observation window (12) is provided on the elbow (11), and the observation window (12) corresponds to the inner tube (1-2).

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