Novel oxygen lance nozzle for converter

Abstract

The utility model provides a novel oxygen lance nozzle for a converter, which comprises an oxygen spraying pipe, a plurality of oxygen spraying holes I arranged at the end part of the oxygen spraying pipe and an oxygen distributing pipe arranged in the oxygen spraying pipe in a penetrating manner, one end of the oxygen distributing pipe is communicated with an oxygen spraying hole II, the plurality of oxygen spraying holes I are arranged at the periphery of the oxygen spraying hole II in an annular array manner, and the oxygen spraying holes II are communicated with the oxygen distributing pipe. A distribution assembly used for distributing oxygen to the second oxygen spraying holes is arranged at the other end of the oxygen distributing pipe, a plurality of long holes are formed in the side portion of the oxygen distributing pipe in an array mode, internal threads are arranged on the inner side of the other end of the oxygen distributing pipe, and the distribution assembly comprises a valve rod with one end movably arranged at the long holes in the oxygen distributing pipe and a valve head connected with the other end of the valve rod. According to the novel oxygen lance nozzle for the converter, the length of a jet flow core area is enhanced through high-Mach-number jetting of the outlet of the second oxygen spraying hole so as to improve the slagging rate, splashing of liquid metal is reduced through low-Mach-number jetting of the outlet of the first oxygen spraying hole, the splashing of the liquid metal is reduced while the smelting efficiency is improved, and the oxygen lance is safer to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical technical field, concretely relates to a new type oxygen lance nozzle for converter. BACKGROUND

[0002] Converter steelmaking is the main steelmaking method of smelting high-quality steel in the world, and the progress and development of its technology have a huge driving effect on energy saving, emission reduction, cost reduction and efficiency increase of the steel industry. Oxygen lance is the key equipment for converter steelmaking, and the structural parameters of its nozzle will directly affect the oxygen jet characteristics and smelting performance. At present, the oxygen lance nozzle used by steel enterprises in China mainly includes traditional symmetrical structure, rotational flow structure, secondary combustion structure and staggered structure. In order to shorten the blowing time of metal and improve the efficiency of smelting, the way of improving the jet intensity of oxygen lance nozzle is often adopted, but after improving the jet intensity, it is easy to cause the splashing of smelting metal liquid in the converter, and the smelting metal liquid splashing on the oxygen lance will further cause adhesion and gun burning, and safety accidents.

[0003] When the jet intensity of the existing oxygen lance nozzle is high, it is easy to cause the splashing of smelting liquid in the converter, and the smelting liquid adheres to the oxygen lance to cause gun burning, so the use of the oxygen lance nozzle is not safe, and the present scheme solves this technical problem. CONTENT OF THE UTILITY MODEL

[0004] In view of the defects of the prior art, the utility model provides a new type oxygen lance nozzle for converter, the outlet high Mach number jet of the second oxygen injection hole is strengthened to improve the length of the slagging rate core area, the outlet low Mach number of the first oxygen injection hole reduces the splashing of liquid metal, the oxygen reaching the optimal double Mach number matching parameters through the outlet of the first oxygen injection hole and the second oxygen injection hole improves the smelting efficiency while reducing the splashing of liquid metal, and the use of the oxygen lance is safer.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme: a new type oxygen lance nozzle for converter, comprising an oxygen injection pipe, a plurality of first oxygen injection holes are arranged at the end of the oxygen injection pipe, a oxygen distribution pipe is arranged in the oxygen injection pipe, a second oxygen injection hole is arranged at one end of the oxygen distribution pipe, a plurality of first oxygen injection holes are arranged in the outer periphery of the second oxygen injection hole in a ring array, and a distribution assembly for distributing oxygen to the second oxygen injection hole is arranged at the other end of the oxygen distribution pipe.

[0006] A plurality of long holes are arranged in the side of the oxygen distribution pipe, an internal thread is arranged on the inner side of the other end of the oxygen distribution pipe, the distribution assembly comprises a valve rod movably arranged at the long hole of the oxygen distribution pipe and a valve head connected to the other end of the valve rod, and an external thread corresponding to the internal thread is arranged on the side of the valve rod.

[0007] A fastening nut is arranged on the outer side of the valve rod, and the fastening nut abuts against the end of the oxygen distribution pipe.

[0008] The oxygen injection hole one and the oxygen injection hole two are both Laval nozzle structures.

[0009] The outer gap of the oxygen injection pipe is sleeved with a spacing sleeve, the outer gap of the spacing sleeve is sleeved with an outer protective tube, the end of the outer protective tube is connected with the end of the oxygen injection pipe, the oxygen injection pipe and the spacing sleeve form a water inlet cavity allowing cooling water to enter, the outer protective tube and the spacing sleeve form a water outlet cavity allowing cooling water to outlet, and the water inlet cavity communicates with the water outlet cavity through the end of the spacing sleeve.

[0010] The outer side of the oxygen injection pipe is provided with a spiral structure.

[0011] The inner side of the outer protective tube is provided with a spiral structure.

[0012] The oxygen lance nozzle is made of red copper.

[0013] The Mach number of the outlet of the oxygen injection hole one is 1.9-2.1, and the Mach number of the outlet of the oxygen injection hole two is 2.0-2.2.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] (1) the high Mach number injection of the outlet of the oxygen injection hole two strengthens the length of the jet core area, thereby improving the slagging rate, the low Mach number of the outlet of the oxygen injection hole one reduces the splashing of the liquid metal, reduces the loss of the liquid metal, the adjustment of the distribution assembly makes the oxygen gas passing through the outlets of the oxygen injection hole one and the oxygen injection hole two reach the parameters of optimal double Mach number cooperation, improves the smelting efficiency while reducing the splashing of the liquid metal, so that the use of the oxygen lance is safer;

[0016] (2) the spiral structure provided on the outer side of the oxygen injection pipe and the spiral structure provided on the inner side of the outer protective tube make the cooling water flow faster in the water inlet cavity and the water outlet cavity, improve the heat exchange effect of the outer protective tube, make the use of the oxygen lance safer, and on the other hand, the protruding edges of the spiral structure mechanically reinforce the oxygen injection pipe and the outer protective tube, so that the use of the oxygen lance is safer and more reliable;

[0017] (3) the fastening nut sleeved on the outer side of the valve rod avoids the movement of the valve rod, so that the adjustment of the distribution assembly is more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the sectional view structure schematic diagram of the utility model.

[0019] Figure 2 is the external structure schematic diagram of the distribution assembly of the utility model.

[0020] Wherein, in the figure: 1, oxygen injection pipe; 2, oxygen injection hole one; 3, oxygen distribution pipe; 31, long hole; 4, oxygen injection hole two; 5, distribution assembly; 51, valve stem; 52, valve head; 53, fastening nut; 6, spacer sleeve; 7, outer protective tube; 8, water inlet cavity; 9, water return cavity. DETAILED DESCRIPTION

[0021] In order to make the technical features of the scheme clearer, the scheme will be described below through specific embodiments.

[0022] Reference Figure 1 , Figure 2 A new oxygen lance nozzle for converter, comprising an oxygen injection pipe 1, the end of the oxygen injection pipe 1 is provided with a plurality of oxygen injection holes one 2, further comprising an oxygen distribution pipe 3 arranged in the oxygen injection pipe 1, one end of the oxygen distribution pipe 3 is provided with an oxygen injection hole two 4, the plurality of oxygen injection holes one 2 are arranged in an annular array outside the oxygen injection hole two 4, the other end of the oxygen distribution pipe 3 is provided with a distribution assembly 5 for distributing oxygen to the oxygen injection hole two 4, specifically, the oxygen lance nozzle is connected with the oxygen lance in a separable manner.

[0023] The side of the oxygen distribution pipe 3 is arranged with a plurality of long holes 31, the other end of the oxygen distribution pipe 3 is provided with an internal thread, the distribution assembly 5 comprises a valve stem 51 movably arranged at the long hole 31 in the oxygen distribution pipe 3, and a valve head 52 connected with the other end of the valve stem 51, the side of the valve stem 51 is provided with an external thread corresponding to the internal thread.

[0024] The outer side of the valve stem 51 is sleeved with a fastening nut 53, and the fastening nut 53 abuts against the end of the oxygen distribution pipe 3.

[0025] The oxygen injection hole one 2 and the oxygen injection hole two 4 are both Laval nozzle structures.

[0026] The outer side of the oxygen injection pipe 1 is sleeved with a spacer sleeve 6, the outer side of the spacer sleeve 6 is sleeved with an outer protective tube 7, the end of the outer protective tube 7 is connected with the end of the oxygen injection pipe 1, the oxygen injection pipe 1 and the spacer sleeve 6 form a water inlet cavity 8 allowing cooling water to enter, the outer protective tube 7 and the spacer sleeve 6 form a water return cavity 9 allowing cooling water to discharge, and the water inlet cavity 8 communicates with the water return cavity 9 through the end of the spacer sleeve 6.

[0027] The outer side of the oxygen injection pipe 1 is provided with a spiral structure, and the water inlet cavity 8 is provided with a water inlet pipe in the tangential direction of the oxygen injection pipe 1.

[0028] The inner side of the outer protective tube 7 is provided with a spiral structure, and the water return cavity 9 is provided with a drain pipe.

[0029] The Mach number of the outlet of the oxygen injection hole one 2 is 1.9-2.1, and the Mach number of the outlet of the oxygen injection hole two 4 is 2.0-2.2, specifically, the Mach number of the outlet of the oxygen injection hole two 4 is greater than the Mach number of the outlet of the oxygen injection hole one 2.

[0030] The total flow of oxygen entering the oxygen injection pipe 1 in the embodiment is 20000-3000Nm 3 The number of the first oxygen injection holes 2 is 5, the number of the second oxygen injection holes 4 is 1, and the angle between the first oxygen injection holes 2 and the central axis of the nozzle is 10-15 degrees.

[0031] The specific working process and principle of the utility model are as follows:

[0032] The oxygen enters the oxygen lance nozzle through the oxygen injection pipe 1, part of the oxygen is sprayed out through the first oxygen injection holes 2, and the other part of the oxygen is sprayed out through the second oxygen injection holes 4 after passing through the long hole 31 of the oxygen distribution pipe 3. The metal in the metal bath is blown and smelt through the first oxygen injection holes 2 and the second oxygen injection holes 4. When it is necessary to adjust the Mach number of the outlet of the second oxygen injection holes 4 and the first oxygen injection holes 2, the oxygen lance is extracted from the converter and cooled, then the nozzle is detached from the oxygen lance, and then the valve head 52 of the distribution assembly 5 is screwed to rotate the valve rod 51 in the oxygen distribution pipe 3, the cross section of the long hole 31 is blocked by the valve rod 51, the Mach number parameters of the outlet of the second oxygen injection holes 4 and the first oxygen injection holes 2 are adjusted, the Mach number of the outlet of the second oxygen injection holes 4 is greater than that of the outlet of the first oxygen injection holes 2, when the oxygen through the first oxygen injection holes 2 and the second oxygen injection holes 4 is adjusted to the set Mach number, the high Mach number of the outlet of the second oxygen injection holes 4 strengthens the length of the jet core area, and the smelting efficiency is improved, the spatter of the liquid metal through the outlet of the first oxygen injection holes 2 is reduced, the loss of the liquid metal is reduced, the oxygen through the outlet of the first oxygen injection holes 2 and the second oxygen injection holes 4 reaches the optimal Mach number parameters through the adjustment of the distribution assembly 5, the smelting efficiency is improved, the spatter of the liquid metal is reduced, and the use of the oxygen lance is safer.

[0033] Before the oxygen lance nozzle is inserted into the converter, cooling water is introduced into the water inlet cavity 8 between the oxygen injection pipe 1 and the spacing sleeve 6, the cooling water rotates along the outer wall of the oxygen injection pipe 1 under the guidance of the spiral structure, passes through the end of the spacing sleeve 6, enters the water return cavity 9, and is discharged through the drain pipe under the guidance of the spiral structure in the water return cavity 9. When the oxygen lance is inserted into the metal bath, the heat of the outer protective pipe 7 is taken away by the cooling water in the water return cavity 9. By arranging the spiral structure on the outside of the oxygen injection pipe 1 and the inside of the outer protective pipe 7, on the one hand, the flow rate of the cooling water in the water inlet cavity 8 and the water return cavity 9 is faster, the heat exchange effect of the outer protective pipe 7 is improved, and the use of the oxygen lance is safer. On the other hand, the protruding edges of the spiral structure mechanically reinforce the oxygen injection pipe 1 and the outer protective pipe 7, so that the use of the oxygen lance is safer and more reliable.

[0034] By sleeving the fastening nut 53 on the outside of the valve rod 51, the movement of the valve rod 51 is avoided, and the adjustment of the distribution assembly 5 is more reliable.

[0035] The technical features not described in the utility model can be realized by or using the prior art, and will not be described here again, of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples, the changes, modifications, additions or replacements made by the ordinary skilled in the art within the essential scope of the utility model should also belong to the protection scope of the utility model.

Claims

1. A new type of oxygen lance nozzle for converter, comprising an oxygen injection pipe (1), the end of the oxygen injection pipe (1) is provided with a plurality of oxygen injection holes (2), characterized in that, The oxygen injection pipe (1) is provided with an oxygen distribution pipe (3) arranged in the oxygen injection pipe (1), one end of the oxygen distribution pipe (3) is provided with a second oxygen injection hole (4), a plurality of first oxygen injection holes (2) are arranged in an annular array outside the second oxygen injection hole (4), and the other end of the oxygen distribution pipe (3) is provided with a distribution assembly (5) for distributing oxygen to the second oxygen injection hole (4). The side of the oxygen distribution pipe (3) is provided with a plurality of elongated holes (31), the other end of the oxygen distribution pipe (3) is provided with an internal thread, the distribution assembly (5) comprises a valve rod (51) movably arranged in the elongated hole (31) of the oxygen distribution pipe (3), and a valve head (52) connected to the other end of the valve rod (51), and the side of the valve rod (51) is provided with an external thread corresponding to the internal thread.

2. A new type of oxygen lance nozzle for converter as claimed in claim 1, wherein, The outer side of the valve rod (51) is provided with a fastening nut (53) abutting against the end of the oxygen distribution pipe (3).

3. A new type of oxygen lance nozzle for converter as claimed in claim 1, wherein, The first oxygen injection hole (2) and the second oxygen injection hole (4) are both Laval nozzles.

4. The new type of oxygen lance nozzle for converter as claimed in claim 1, wherein, The outer side of the oxygen injection pipe (1) is provided with a spacing sleeve (6), the outer side of the spacing sleeve (6) is provided with an outer protective pipe (7), the end of the outer protective pipe (7) is connected to the end of the oxygen injection pipe (1), the oxygen injection pipe (1) and the spacing sleeve (6) form a water inlet cavity (8) allowing cooling water to enter, the outer protective pipe (7) and the spacing sleeve (6) form a water outlet cavity (9) allowing cooling water to be discharged, and the water inlet cavity (8) communicates with the water outlet cavity (9) through the end of the spacing sleeve (6).

5. The new type of oxygen lance nozzle for converter as claimed in claim 4, wherein, The outer side of the oxygen injection pipe (1) is provided with a spiral structure.

6. A new type of oxygen lance nozzle for converter as claimed in claim 5, wherein, The inner side of the outer protective pipe (7) is provided with a spiral structure.

7. A new type of oxygen lance nozzle for converter as claimed in claim 3, wherein, The Mach number of the outlet of the first oxygen injection hole (2) is 1.9-2.1, and the Mach number of the outlet of the second oxygen injection hole (4) is 2.0-2.2.

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