Oxygen lance device of converter smelting oxygen supply equipment

Abstract

The utility model discloses an oxygen lance device of converter smelting oxygen supply equipment, and relates to the technical field of converter smelting. The oxygen lance device of the converter smelting oxygen supply equipment comprises an oxygen lance body, and the upper end of the oxygen lance body is fixedly connected with a straight pipe; the gas mixing assembly comprises a nitrogen sealing disc, the nitrogen sealing disc is connected to the surface of the straight pipe in a sleeving mode, two nitrogen inlet pipes are fixedly connected to the eccentric position of the surface of the nitrogen sealing disc, and two oxygen inlet pipes are fixedly connected to the eccentric position of the surface of the straight pipe; a rotating shaft is rotationally connected into the straight pipe, a plurality of first fan blades and a plurality of second fan blades are fixedly connected to the surface of the rotating shaft, and through arrangement of an oxygen inlet pipe, a nitrogen inlet pipe, a first nitrogen inlet groove and a second nitrogen inlet groove, the first fan blades and the second fan blades can be conveniently driven in the process that oxygen and nitrogen are introduced into the straight pipe; the oxygen and the nitrogen rotate in the straight pipe, so that mixing of the oxygen and the nitrogen can be enhanced, uniform distribution of the gas is ensured, and the mixing effect of the oxygen and the nitrogen is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to converter smelting technical field, especially a converter smelting oxygen supply equipment oxygen lance device. BACKGROUND

[0002] The current industry application more extensive nitrogen increasing measure: through the nitrogen gas to molten steel blow, and make molten steel reach certain nitrogen content, can greatly reduce the production cost of steel, the existing nitrogen gas blowing method mainly has the nitrogen gas and converter bottom blowing nitrogen gas.

[0003] Oxygen lance rich nitrogen technology is unique, in the converter smelting middle and late period, oxygen lance mixes nitrogen gas and oxygen and sprays into molten steel, reaches the purpose of increasing nitrogen, through the operation of oxygen lance mixed nitrogen gas and oxygen, nitrogen gas is decomposed into nitrogen atom at high temperature ignition point, under the impact of high pressure mixed gas, is shot into molten steel, reaches the effect of increasing nitrogen.

[0004] Chinese utility model patent, authorized announcement number "CN209873003U", discloses a kind of oxygen lance device of converter smelting oxygen supply equipment, including oxygen lance body, nitrogen seal disc and fixed seat, the oxygen lance body includes straight pipe, reducing pipe, transition pipe, tapered tube, spray head and spray hole, fixed seat is fixed on straight pipe, straight pipe passes through nitrogen seal disc, the smaller end of reducing pipe diameter is connected with straight pipe, the larger end of reducing pipe diameter is connected with the larger end of tapered tube by transition pipe, the smaller end of tapered tube diameter is equipped with spray head.

[0005] The above technical scheme reduces the amount of slag sticking to the oxygen blowing equipment, shortens the cleaning time, frequency and maintenance frequency of the oxygen supply equipment, improves the sealing effect of the converter oxygen lance insertion port, and prevents the overflow of furnace flue gas. However, the above technical scheme still has certain defects. The oxygen lance directly introduces oxygen and nitrogen into the inner part of the oxygen lance body. Since there is no structure for mixing nitrogen and oxygen, it is inconvenient to mix oxygen and nitrogen. If the oxygen and nitrogen in the oxygen lance are not uniformly mixed, the local nitrogen content of the molten steel may be too high or too low, causing fluctuations in the overall nitrogen content. Fluctuations in nitrogen content can cause instability in the yield limit, strength limit, hardness, and plasticity of steel, affecting product quality. In the tapping process, nitrogen-containing alloys (such as vanadium-nitrogen alloy and silicon-iron nitride) are added to the molten steel. Micro-alloying is used. The addition of nitrogen-containing alloys may contaminate the molten steel and reduce its purity. The nitrogen recovery rate is low, and the nitrogen content in the steel is difficult to control. Therefore, the utility model proposes a new solution. UTILITY MODEL CONTENTS

[0006] The utility model discloses a converter smelting oxygen supply equipment oxygen lance device can solve the oxygen lance is directly in the oxygen lance body respectively and passes into oxygen and nitrogen, because not set up the structure of mixed nitrogen and oxygen, it is inconvenient to mix oxygen and nitrogen, can lead to the partial nitrogen content of liquid steel too high or too low, thereby make the overall nitrogen content fluctuation, and nitrogen content fluctuation can lead to the yield limit, strength limit, hardness and plasticity etc. of steel performance are unstable, influence product quality's problem.

[0007] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a converter smelting oxygen supply equipment oxygen lance device, including oxygen lance main part, the upper end fixed connection of oxygen lance main part has straight pipe;

[0008] Gas mixing assembly, gas mixing assembly sets up in the inside of straight pipe, and gas mixing assembly includes nitrogen seal disc, and nitrogen seal disc sleeve joint is at the surface of straight pipe, and the surface eccentricity of nitrogen seal disc is fixedly connected with two nitrogen gas inlet pipes, and the surface eccentricity of straight pipe is fixedly connected with two oxygen gas inlet pipes;

[0009] Nitrogen seal disc is close to the one end of straight pipe and is seted up with second nitrogen gas inlet groove, and the surface of straight pipe is close to nitrogen seal disc one side and is seted up with first nitrogen gas inlet groove, and the number of first nitrogen gas inlet groove and second nitrogen gas inlet groove all has multiple, and all sets up in the eccentricity of corresponding straight pipe and nitrogen seal disc;

[0010] The inside rotation of straight pipe is connected with the pivot, and the surface of pivot is fixedly connected with a plurality of first vane and a plurality of second vane, and the inclination angle of a plurality of first vane and a plurality of second vane is opposite.

[0011] Preferably, the lower end of the oxygen lance main body is fixedly connected with a spray head, and the lower end of the oxygen lance main body is conical.

[0012] Preferably, the inside of the oxygen lance main body is fixedly connected with an oxygen lance reducing pipe, and the outer surface of the oxygen lance reducing pipe is fixedly connected with a water baffle.

[0013] Preferably, the water baffle divides the cavity composed of the oxygen lance main body and the oxygen lance reducing pipe into two parts, and the lower ends of the two parts are communicated.

[0014] Preferably, the surface of the oxygen lance main body is fixedly connected with a water inlet pipe and a water outlet pipe.

[0015] Preferably, the water inlet pipe extends to the inside of the oxygen lance main body and penetrates one side inner wall of the water baffle.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. The converter smelting oxygen supply equipment oxygen lance device, through the setting of oxygen inlet pipe, nitrogen inlet pipe, first nitrogen inlet groove and second nitrogen inlet groove, the first fan blade and the second fan blade are driven in the process of oxygen and nitrogen entering the straight pipe, oxygen and nitrogen rotate in the straight pipe, through the opposite setting of the inclination angle of the first fan blade and the second fan blade, oxygen and nitrogen can impact the inner wall of the straight pipe in the rotating process, the mixing between oxygen and nitrogen can be strengthened, the uniform distribution of gas is ensured, the mixing effect of oxygen and nitrogen is improved, the fluctuation degree of local nitrogen content of molten steel is reduced, and the product quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further illustrated below in combination with the drawings and examples:

[0019] Figure 1 It is a structure schematic view of the oxygen lance device of the converter smelting oxygen supply equipment of the utility model;

[0020] Figure 2 It is an oxygen lance reducing pipe schematic view of the utility model;

[0021] Figure 3 It is a straight pipe schematic view of the utility model;

[0022] Figure 4 It is a rotating shaft schematic view of the utility model.

[0023] The drawings show that 1 is the oxygen lance main body, 2 is the straight pipe, 3 is the nitrogen seal disc, 4 is the spray head, 5 is the oxygen inlet pipe, 6 is the nitrogen inlet pipe, 7 is the first nitrogen inlet groove, 8 is the second nitrogen inlet groove, 9 is the first fan blade, 10 is the second fan blade, 11 is the water inlet pipe, 12 is the water outlet pipe, 13 is the oxygen lance reducing pipe, 14 is the water baffle cover, and 15 is the rotating shaft. DETAILED DESCRIPTION

[0024] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings are used to supplement the description of the text part in the form of graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0025] In the description of the utility model, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like based on the orientation or position relationship shown in the drawings is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as the limitation of the utility model.

[0026] In the description of the utility model, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described as first, second, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0027] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood in a broad sense, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0028] Please refer to Figures 1-4 The utility model provides a technical scheme: a converter smelting oxygen supply equipment oxygen lance device, including oxygen lance main part 1, the upper end of oxygen lance main part 1 is fixedly connected with straight pipe 2, gas mixing subassembly, gas mixing subassembly is set up in the inside of straight pipe 2, and gas mixing subassembly includes nitrogen seal disc 3, nitrogen seal disc 3 is sleeved on the surface of straight pipe 2, and the eccentricity of the surface of nitrogen seal disc 3 is fixedly connected with two nitrogen gas inlet pipes 6, and the eccentricity of the surface of straight pipe 2 is fixedly connected with two oxygen gas inlet pipes 5, and the end close to straight pipe 2 of nitrogen seal disc 3 is provided with second nitrogen gas inlet groove 8, and the side close to nitrogen seal disc 3 of the surface of straight pipe 2 is provided with first nitrogen gas inlet groove 7, the number of first nitrogen gas inlet groove 7 and second nitrogen gas inlet groove 8 is multiple, and is all set up in the eccentricity of corresponding straight pipe 2 and nitrogen seal disc 3, and the inside of straight pipe 2 is rotatably connected with pivot 15, and the surface of pivot 15 is fixedly connected with multiple first fan blade 9 and multiple second fan blade 10, and the inclination angle of multiple first fan blade 9 and multiple second fan blade 10 is opposite.

[0029] The lower end of oxygen lance main part 1 is fixedly connected with spray head 4, and the lower end of oxygen lance main part 1 is conical.

[0030] The inside of oxygen lance main part 1 is fixedly connected with oxygen lance reducing pipe 13, the outer surface of oxygen lance reducing pipe 13 is fixedly connected with water baffle 14, water baffle 14 divides the cavity formed by oxygen lance main part 1 and oxygen lance reducing pipe 13 into two parts, and the lower ends of the two parts are communicated.

[0031] The surface of oxygen lance main part 1 is fixedly connected with water inlet pipe 11 and water outlet pipe 12, water inlet pipe 11 extends to the inside of oxygen lance main part 1 and penetrates one side inner wall of water baffle 14.

[0032] In use of the oxygen lance, first, the nitrogen sealing disc 3 is sleeved on the surface of the straight pipe 2, oxygen is introduced into the interior of the straight pipe 2 from the oxygen inlet pipe 5, nitrogen is introduced into the interior of the nitrogen sealing disc 3 from the nitrogen sealing disc 3, and is introduced into the interior of the straight pipe 2 from the first nitrogen inlet groove 7 and the second nitrogen inlet groove 8. Since the oxygen inlet pipe 5, the nitrogen inlet pipe 6, the first nitrogen inlet groove 7 and the second nitrogen inlet groove 8 are eccentrically arranged, the first vane 9 and the second vane 10 can be driven in the process of introduction of the oxygen and the nitrogen into the interior of the straight pipe 2, the first vane 9 and the second vane 10 rotate, the inclination angles of the first vane 9 and the second vane 10 are opposite, the mixing between the oxygen and the nitrogen can be enhanced, the gas can be uniformly distributed, and the mixing effect of the oxygen and the nitrogen is improved.

[0033] The oxygen lance variable diameter pipe 13 is arranged in the interior of the oxygen lance body 1. When the mixed gas passes from the position with large cross section to the position with small cross section, the flow rate of the mixed gas is enhanced, and the pressure can be locally increased. The mixed gas is pressurized by the two times of cross section changes of the oxygen lance variable diameter pipe 13, so that the pressure of the mixed gas is enhanced when the mixed gas passes through the nozzle 4.

[0034] Since the mixed gas in the interior of the oxygen lance body 1 is heated in the process of use of the oxygen lance in the converter smelting, the cooling water is introduced into the interior of the water inlet pipe 11, flows from the cavity of the oxygen lance variable diameter pipe 13 and the water retaining cover 14 to the cavity of the oxygen lance body 1, and finally flows out from the water outlet pipe 12. The cooling effect is effectively improved, the oxygen lance body 1 is protected from high temperature damage, the deformation and melting of the equipment due to overheating are prevented, the safety and stable operation of the equipment are protected, the thermal stress of the oxygen lance body 1 is reduced, the thermal fatigue is reduced, and the service life of the oxygen lance body 1 is prolonged.

[0035] The lower end of the oxygen lance body 1 is conical, the slag can be prevented from adhering to the lower end of the oxygen lance body 1, the conical design can optimize the flow state of the gas, the mixed gas can flow more smoothly when passing through the oxygen lance, the flow resistance is reduced, and the jet effect of the oxygen lance is improved.

[0036] Further, the first vane 9 and the second vane 10 are driven in the process of introduction of the oxygen and the nitrogen into the interior of the straight pipe 2 by the oxygen inlet pipe 5, the nitrogen inlet pipe 6, the first nitrogen inlet groove 7 and the second nitrogen inlet groove 8. The oxygen and the nitrogen rotate in the interior of the straight pipe 2. The oxygen and the nitrogen impact the inner wall of the straight pipe 2 in the rotating process by the opposite inclination angles of the first vane 9 and the second vane 10. The mixing between the oxygen and the nitrogen can be enhanced, the gas can be uniformly distributed, the mixing effect of the oxygen and the nitrogen is improved, the fluctuation degree of the local nitrogen content of the steel liquid is reduced, and the product quality is improved.

[0037] The water inlet pipe 11, the water outlet pipe 12, the oxygen lance reducer pipe 13 and the water baffle 14 are arranged, so that the flow rate of the mixed gas is enhanced when the mixed gas passes through the oxygen lance reducer pipe 13, and the cooling water is introduced into the cavities formed by the oxygen lance reducer pipe 13 and the water baffle 14 and the water baffle 14 and the oxygen lance body 1, so as to cool the oxygen lance body 1, protect the oxygen lance body 1 from high temperature damage, prevent the equipment from being deformed, melted and damaged due to overheating, thereby protecting the safety and stable operation of the equipment, effectively reducing the thermal stress of the oxygen lance body 1, reducing thermal fatigue, and prolonging the service life of the oxygen lance body 1.

[0038] Working principle: when the oxygen lance is used, the nitrogen sealing disc 3 is sleeved on the surface of the straight pipe 2, the oxygen is introduced into the inside of the straight pipe 2 from the oxygen inlet pipe 5, the nitrogen is introduced into the inside of the nitrogen sealing disc 3 from the nitrogen sealing disc 3, and the nitrogen is introduced into the inside of the straight pipe 2 from the first nitrogen inlet groove 7 and the second nitrogen inlet groove 8. Since the oxygen inlet pipe 5, the nitrogen inlet pipe 6, the first nitrogen inlet groove 7 and the second nitrogen inlet groove 8 are eccentrically arranged, the first fan blade 9 and the second fan blade 10 can be driven during the introduction of the oxygen and the nitrogen into the inside of the straight pipe 2, so that the first fan blade 9 and the second fan blade 10 rotate, the inclination angles of the first fan blade 9 and the second fan blade 10 are opposite, the mixing between the oxygen and the nitrogen can be enhanced, the gas can be uniformly distributed, and the mixing effect of the oxygen and the nitrogen can be improved.

[0039] The oxygen lance reducer pipe 13 is arranged in the inside of the oxygen lance body 1, so that when the mixed gas passes through the position with a smaller cross section from the position with a larger cross section, the flow rate of the mixed gas is enhanced, the pressure may be locally increased, and the mixed gas is pressurized through the change of the two cross sections of the oxygen lance reducer pipe 13, so that the pressure of the mixed gas is enhanced when the mixed gas passes through the nozzle 4.

[0040] Since the mixed gas in the inside of the oxygen lance body 1 is heated during the use of the oxygen lance in the process of converter smelting, the cooling water is introduced into the inside of the water inlet pipe 11, flows from the cavity between the oxygen lance reducer pipe 13 and the water baffle 14 to the cavity between the water baffle 14 and the oxygen lance body 1, and finally flows out from the water outlet pipe 12, so as to effectively improve the cooling effect, protect the oxygen lance body 1 from high temperature damage, prevent the equipment from being deformed, melted and damaged due to overheating, thereby protecting the safety and stable operation of the equipment, effectively reducing the thermal stress of the oxygen lance body 1, reducing thermal fatigue, and prolonging the service life of the oxygen lance body 1.

[0041] The lower end of the oxygen lance body 1 is conical, which can prevent the slag from adhering to the lower end of the oxygen lance body 1, the conical design can optimize the flow state of the gas, make the mixed gas pass through the oxygen lance more smoothly, reduce the flow resistance, and improve the jet effect of the oxygen lance.

[0042] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range of ordinary skill in the art person who has possessed under the premise of not departing from the utility model tenet.

Claims

1. A converter smelting oxygen supply device lance device, characterized by: Including oxygen lance body (1), the upper end of oxygen lance body (1) is fixedly connected with straight pipe (2); The gas mixing assembly is arranged in the inside of the straight pipe (2), and the gas mixing assembly comprises a nitrogen seal disc (3), the nitrogen seal disc (3) is sleeved on the surface of the straight pipe (2), two nitrogen gas inlet pipes (6) are fixedly connected to the eccentric surface of the nitrogen seal disc (3), and two oxygen gas inlet pipes (5) are fixedly connected to the eccentric surface of the straight pipe (2); The nitrogen seal disc (3) is provided with a second nitrogen gas inlet groove (8) near one end of the straight pipe (2), the surface of the straight pipe (2) is provided with a first nitrogen gas inlet groove (7) near the nitrogen seal disc (3), the number of the first nitrogen gas inlet groove (7) and the second nitrogen gas inlet groove (8) is multiple, and they are arranged at the eccentric positions of the corresponding straight pipe (2) and nitrogen seal disc (3); The inside of the straight pipe (2) is rotatably connected with a rotating shaft (15), the surface of the rotating shaft (15) is fixedly connected with a plurality of first vanes (9) and a plurality of second vanes (10), and the inclination angles of the plurality of first vanes (9) and the plurality of second vanes (10) are opposite.

2. A converter smelting oxygen supply device lance apparatus according to claim 1, characterized in that: The lower end of the oxygen lance body (1) is fixedly connected with a spray head (4), and the lower end of the oxygen lance body (1) is conical.

3. The oxygen lance device of claim 1, wherein: The inside of the oxygen lance body (1) is fixedly connected with an oxygen lance reducing pipe (13), and the outer surface of the oxygen lance reducing pipe (13) is fixedly connected with a water baffle (14).

4. A lance device for an oxygen supply apparatus for a converter smelting according to claim 3, characterized in that: The water baffle (14) divides the cavity composed of the oxygen lance body (1) and the oxygen lance reducing pipe (13) into two parts, and the lower ends of the two parts are communicated.

5. The oxygen lance device of claim 1, wherein: The surface of the oxygen lance body (1) is fixedly connected with a water inlet pipe (11) and a water outlet pipe (12).

6. A converter oxygen lancing device according to claim 5 wherein: The water inlet pipe (11) extends to the inside of the oxygen lance body (1) and penetrates one side inner wall of the water baffle (14).

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