Double-channel nitrogen blowing gun for molten iron treatment

Abstract

The utility model discloses a double-channel nitrogen blowing gun for molten iron treatment, which belongs to the technical field of iron smelting and comprises a double-air-inlet-channel gun body used for blowing out nitrogen, and the end portion, far away from an air outlet of the double-air-inlet-channel gun body, of the double-air-inlet-channel gun body is communicated with an external air source through an air inlet rotating joint. A rotary support used for supporting the double-air-inlet-channel gun body to rotate is arranged at the position, away from an air outlet of the double-air-inlet-channel gun body, of the double-air-inlet-channel gun body, and a rotary drive used for driving the rotary support and the double-air-inlet-channel gun body to rotate is arranged on one side of the rotary support. According to the nitrogen blowing device, the blocking risk can be reduced, meanwhile, the nitrogen blowing angle can be adjusted in combination with rotary driving, and the nitrogen blowing uniformity is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of iron smelting, and particularly relates to a double-channel nitrogen lance for molten iron treatment. BACKGROUND

[0002] Molten iron vanadium extraction is a key process for efficient recovery of vanadium resources, and the core lies in stirring the molten iron by nitrogen blowing to promote oxidation of vanadium elements and enrichment in the slag phase. In the traditional process, the nitrogen lance as a core equipment directly determines the vanadium oxidation rate, reaction period and equipment operation stability. With the improvement of the requirements of the steel industry on resource comprehensive utilization and green production, the technical optimization of the nitrogen lance has become an important direction for upgrading the steelmaking process.

[0003] The current industry commonly used nitrogen lance structure is shown in the accompanying drawings Figure 1 The single-channel double-nitrogen outlet design is fixed in position and angle, and the single-channel double-nitrogen outlet design needs to penetrate the high-viscosity slag layer when the nitrogen lance is inserted into the molten iron, which causes the dregs to easily adhere to and block the channel. According to statistics, the single-channel nitrogen lance has a blockage rate of up to 30%-40% in continuous operation, and is forced to frequently stop for slag removal, which seriously affects the production efficiency. Experimental data show that when the single side is blocked, the local vanadium oxidation rate of the molten iron fluctuates by more than 10%, the composition of the slag phase is uneven, and the grade of the vanadium slag finally decreases by 2%-3%. In addition, due to the fixed angle of the nitrogen outlet, only directional blowing can be achieved, which limits the stirring range of the molten iron.

[0004] In addition, the fixed blowing direction of the single-channel double-nitrogen outlet design of the nitrogen lance causes local heating and scouring of the lining material in the molten iron ladle, and the service life of the ladle lining is shortened by about 15% after the single-channel nitrogen lance is used, and the annual maintenance cost increases by more than 2 million yuan. UTILITY MODEL CONTENTS

[0005] In order to solve the problems of easy blockage and fixed blowing direction of the single-channel double-nitrogen outlet nitrogen lance in the prior art, the utility model provides a double-channel nitrogen lance for molten iron treatment, which can reduce the risk of blockage and adjust the blowing angle in combination with the rotary drive.

[0006] The utility model discloses a double-channel nitrogen lance for molten iron treatment, which adopts the technical scheme that:

[0007] A double-channel nitrogen lance for molten iron treatment, comprising a double-gas inlet channel lance body for blowing out nitrogen, the end of the double-gas inlet channel lance body away from the gas outlet thereof is connected in communication with an external gas source through a gas inlet rotary joint, a rotary support for supporting the rotation of the double-gas inlet channel lance body is arranged at the position of the double-gas inlet channel lance body away from the gas outlet thereof, and a rotary drive for driving the rotation of the rotary support and the double-gas inlet channel lance body is arranged on one side of the rotary support.

[0008] The further improvement in the technical scheme of the utility model lies in that two gas conveying channels are arranged side by side along the length direction of the double-inlet-channel gun body, each of the gas conveying channels is communicated with an external gas source through an inlet rotary joint, and each of the gas conveying channels is fixedly connected with a gas jet head at the end away from the inlet rotary joint, and the gas outlet directions of the two gas jet heads are opposite.

[0009] The further improvement in the technical scheme of the utility model lies in that the rotary support is a bearing, the inner ring of the bearing is sleeved on the double-inlet-channel gun body and fixedly connected with the double-inlet-channel gun body, and the outer ring of the bearing is fixed on the external support.

[0010] The further improvement in the technical scheme of the utility model lies in that the external support is connected with the inlet rotary joint through a connecting rod.

[0011] The further improvement in the technical scheme of the utility model lies in that the rotary drive includes a driving motor arranged on the external support, and the driving motor is connected with the inner ring of the rotary support through a speed reducer.

[0012] The further improvement in the technical scheme of the utility model lies in that the adjustable range of the rotating speed of the driving motor is 0.1-30 revolutions per minute.

[0013] The further improvement in the technical scheme of the utility model lies in that the inlet rotary joint is made of high-temperature-resistant material, and the working temperature is not lower than 1100 DEG C.

[0014] Thanks to the above technical scheme, the technical progress achieved by the utility model includes:

[0015] The inlet rotary joint arranged in the utility model can continuously introduce nitrogen when the double-inlet-channel gun body rotates, thereby preventing gas leakage; the rotary support arranged in the utility model can fix the double-inlet-channel gun body and make the double-inlet-channel gun body rotate at the same time; and the rotary drive arranged in the utility model can drive the double-inlet-channel gun body to rotate.

[0016] The double-inlet-channel gun body rotates and discharges gas into the ladle at the same time, the rotating double-inlet-channel gun body can agitate the slag layer in the ladle, thereby avoiding that the slag adheres to the double-inlet-channel gun body and blocks the gas jet head.

[0017] The double gas inlet channel gun body adopts parallel independent design, each gas inlet channel is equipped with independent gas inlet path and jet head.

[0018] The connecting rod is arranged, and when the rotary drive drives the double gas inlet channel gun body to rotate, the external support can be prevented from rotating with the double gas inlet channel gun body.

[0019] The driving motor speed is adjustable, and the speed of the driving motor can be adjusted conveniently according to the actual situation of molten iron.

[0020] The rotary drive drives the double gas inlet channel gun body to rotate, the blowing direction of nitrogen can be adjusted in the molten iron ladle, on one hand, the purpose of stirring molten iron can be achieved, on the other hand, the blowing uniformity of nitrogen can be improved, meanwhile, the local heating and washing of the lining refractory in the molten iron ladle caused by the fixed blowing direction can be prevented, the maintenance cost of the ladle lining is reduced, and the service life of the ladle lining is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the single-channel nitrogen blowing gun in the background art of the utility model;

[0022] Figure 2 is a structural schematic view of a double-channel nitrogen blowing gun for molten iron treatment.

[0023] In the drawings: 1, double gas inlet channel gun body; 11, gas inlet channel; 12, jet head;

[0024] 2, gas inlet rotary joint;

[0025] 3, rotary support; 4, external support; 41, connecting rod;

[0026] 5, rotary drive; 51, driving motor; 52, speed reducer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the utility model is further explained in detail below by combining with specific implementation manners and referring to the drawings. In the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0028] Example one

[0029] ReferenceFigure 2 It can be known that the utility model discloses a double inlet channel gun body 1 for blowing nitrogen, two gas conveying channels 11 are provided side by side along the length direction of the double inlet channel gun body 1, a gas jet head 12 is fixedly connected to the end of each gas conveying channel 11, the gas outlet directions of the two gas jet heads 12 are different, preferably, the gas outlet directions of the two gas jet heads 12 are opposite, the end of the double inlet channel gun body 1 away from the gas jet head 12 is connected with an external gas source through an inlet rotary joint 2, and nitrogen in the external gas source is sprayed to molten iron through the inlet rotary joint 2, the gas conveying channel 11 and the gas jet head 12 in sequence.

[0030] The utility model discloses a double inlet channel gun body 1 away from the position of the gas jet head 12 is equipped with the rotary support 3, the rotary support 3 preferably can adopt double row four point contact ball bearing or other bearing in prior art, and the inner ring of bearing is equipped on the outer wall of double inlet channel gun body 1 and is fixedly connected with the outer wall of double inlet channel gun body 1 through bolt.

[0031] The utility model discloses still including with the rotary support 3 fixed connection's external support 4, this external support 4 fixedly equipped in the outer ring of bearing, the specific external support 4 can be fixed together with the outer ring of bearing through bolt or welding etc. fixed mode, and the external direct through L type's connecting rod 41 is connected with inlet rotary joint 2.

[0032] The utility model discloses a rotary drive 5 for driving the rotation of the double inlet channel gun body 1 is arranged on the external support 4, the rotary drive 5 specifically includes the drive motor 51 fixed on the external support 4 through the motor base, the drive motor 51 adopts the motor of adjustable speed in prior art, and the adjustable speed range of drive motor 51 is 0.1-30 turns / minute, and the motor base and the external support 4 are also provided with damping rubber pad between, the rotary drive 5 still includes the speed reducer 52 fixed on the external support 4, and the output shaft of drive motor 51 is connected with speed reducer 52, and drive double inlet channel gun body 1 rotates through speed reducer 52. The connecting mode between speed reducer 52 and double inlet channel gun body 1 is preferably, the output shaft of speed reducer 52 is fixedly equipped with vertical bevel gear, and the top of the inner ring of bearing is coaxially fixedly provided with horizontal bevel gear, and horizontal bevel gear is meshed with vertical bevel gear, when drive motor 51 rotates, drives speed reducer 52 to rotate, and the output shaft of speed reducer 52 drives vertical bevel gear, horizontal bevel gear and the inner ring of bearing to rotate, thereby making double inlet channel gun body 1 rotate around the axial rotation of itself.

[0033] The working principle of the double-channel nitrogen blowing gun for molten iron treatment in the embodiment is as follows:

[0034] Firstly, the rotary drive 5 is started, the double air inlet channel gun body 1 is rotated by the rotary drive 5, the nitrogen is sprayed outwards by the air outlet head 12 of the double air inlet channel gun body 1, then the utility model is moved, the double air inlet channel gun body 1 is rotated, the nitrogen is sprayed and enters the ladle.

[0035] Since the double air inlet channel gun body 1 continues to rotate in the ladle, the nitrogen spraying direction in the ladle can be adjusted, on the one hand, the purpose of stirring the molten iron can be achieved, on the other hand, the spraying uniformity of the nitrogen can be improved, meanwhile, the local heating and washing of the ladle lining refractory caused by the fixed spraying direction can be prevented, the maintenance cost of the ladle lining is reduced, and the service life of the ladle lining is improved.

[0036] Example two

[0037] The utility model is located above the ladle in use, in order to prevent the influence caused by high temperature to the driving motor 51 and the speed reducer 52, the bottom of the external support 4 is provided with the temperature insulation refractory layer, meanwhile, the top of the external support 4 is provided with the heat shield for covering the driving motor 51 and the speed reducer 52, the vertical bevel gear is located outside the heat shield, the output shaft of the speed reducer 52 penetrates the heat shield and is connected with the vertical bevel gear. In the embodiment, the temperature insulation refractory layer and the heat shield are made of the high-temperature resistant heat insulation material (such as ceramic fiber material, multi-layer composite heat insulation material, hard ceramic material and the like) commonly used in the prior art.

[0038] In the above embodiment, the utility model provides a double channel nitrogen blowing gun for molten iron treatment, the utility model discloses a rotating joint is set up, nitrogen can be continuously introduced when the double air inlet channel gun body rotates, and air leakage is prevented;The utility model discloses a rotary support is set up, the double air inlet channel gun body can rotate while being fixed;The utility model discloses a rotary drive is set up, the double air inlet channel gun body can be driven to rotate;The double air inlet channel gun body of the utility model rotates and discharges into the ladle, the rotating double air inlet channel gun body can agitate the slag layer in the ladle, thereby avoiding that the slag adheres to the double air inlet channel gun body and blocks the air outlet head.

[0039] The above-described embodiments are merely preferred embodiments of the utility model, and do not limit the concept and scope of the utility model. Various modifications and improvements to the technical solutions of the utility model made by those skilled in the art without departing from the design concept of the utility model shall fall within the protection scope of the utility model, and the technical content claimed by the utility model has been fully recorded in the claims.

Claims

1. A double channel nitrogen lance for hot metal treatment, characterized by: The application relates to a double-inlet-channel gun body (1) for blowing nitrogen, wherein the end of the double-inlet-channel gun body (1) away from the self-outlet is connected with an external gas source through an inlet-rotation joint (2), a rotary support (3) for supporting the rotation of the double-inlet-channel gun body (1) is arranged at the position of the double-inlet-channel gun body (1) away from the self-outlet, and a rotary drive (5) for driving the rotation of the rotary support (3) and the double-inlet-channel gun body (1) is arranged on one side of the rotary support (3).

2. The double-channel nitrogen lance for hot metal treatment according to claim 1, characterized in that: Two gas conveying channels (11) are arranged side by side along the length direction of the double-inlet-channel gun body (1), each of the gas conveying channels (11) is connected with an external gas source through the inlet-rotation joint (2), and each of the gas conveying channels (11) is fixedly connected with a gas jet head (12) at the end away from the inlet-rotation joint (2), and the gas outlet directions of the two gas jet heads (12) are opposite.

3. The double-channel nitrogen lance for hot metal treatment according to claim 1, characterized in that: The rotary support (3) is a bearing, the inner ring of the bearing is sleeved on the double-inlet-channel gun body (1) and is fixedly connected with the double-inlet-channel gun body (1), and the outer ring of the bearing is fixed on an external support (4).

4. The double-channel nitrogen lance for hot metal treatment according to claim 3, characterized in that: The external support (4) is connected with the inlet-rotation joint (2) through a connecting rod (41).

5. The double-channel nitrogen lance for hot metal treatment according to claim 3, characterized in that: The rotary drive (5) comprises a driving motor (51) arranged on the external support (4), and the driving motor (51) is connected with the inner ring of the rotary support (3) through a speed reducer (52).

6. The double-channel nitrogen lance for hot metal treatment according to claim 5, characterized in that: The rotating speed of the driving motor (51) can be adjusted in the range of 0.1-30 rpm.

7. The double-channel nitrogen lance for hot metal treatment according to any one of claims 1-6, characterized in that: The inlet-rotation joint (2) is made of high-temperature-resistant material, and the working temperature is not lower than 1100 DEG C.

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