CN212560339U

CN212560339U - Nitrogen spraying gun for molten iron pretreatment

Info

Publication number: CN212560339U
Application number: CN202020947304.XU
Authority: CN
Inventors: 张中钦; 王建佩; 张佳佳; 张晓晨; 安振鹏; 王鹏飞; 卢松峰; 王朝现; 李建武
Original assignee: Gongyi Yixin Refractory Material Factory
Current assignee: Gongyi Yixin Refractory Material Factory
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-02-19
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses a molten iron preliminary treatment is with spouting nitrogen rifle relates to smelt indisputable technical field, the utility model discloses a barrel, barrel bottom distribution have at least one have a plurality of spray chambers, spray chamber end all is connected with L shape spray tube, and the mouth of pipe of all L shape spray tubes all is towards clockwise or anticlockwise, the utility model discloses the reaction force that produces when utilizing the mouth of pipe of gas blowout L shape spray tube drives the barrel rotation to produce certain stirring effect, have that structural design is nimble ingenious, reduced equipment cost, the advantage of assurance mixing effect.

Description

Nitrogen spraying gun for molten iron pretreatment

Technical Field

The utility model relates to a smelt indisputable technical field, concretely relates to hot metal preliminary treatment is with spouting nitrogen gun.

Background

The pretreatment of molten iron is to subject molten iron for steel making to desiliconization, dephosphorization and desulfurization treatment (referred to as "triple elimination" for short), and is mainly carried out in a tapping runner, a mixer car, a ladle and a mixer furnace. The molten iron pretreatment process method comprises the following steps: a molten iron bath continuous treatment method (a spreading method), a molten iron bath blowing method, a mechanical stirring method, a special furnace method, a ladle shaking method, a drum method, a bell jar method, a spraying method, and the like. The continuous treatment method of the molten iron ditch comprises the following steps: the method is the simplest method for pretreating molten iron and can be divided into an overhead method and a blowing method. The pretreatment agent only needs to be spread at a proper position of the molten iron ditch, and the pretreatment agent flows down along with the molten iron and reacts with the molten iron by stirring and impact to remove related impurity elements; in the latter case, the blowing stirring or powder spraying is needed to be arranged on the molten iron ditch, so that the pretreatment agent is blown and stirred to strengthen the contact with the molten iron. The hot metal ladle blowing method comprises the following steps: the pretreating agent is sprayed into the molten iron in the molten iron tank to make the pretreating agent and the molten iron fully react so as to achieve the purposes of purifying the molten iron and removing or extracting relevant elements. A mechanical stirring method: an efficient method for efficiently contacting a pretreating agent placed on the surface of molten iron with molten iron by stirring, which is frequently used for deep desulfurization.

The spray gun is commonly used in the molten iron pretreatment process flow, the nozzle of the spray gun extends into a molten iron ladle, and the nitrogen is used as a carrier to blow a pretreating agent (a dephosphorizing agent or a desulfurizing agent and the like) out of the nozzle, so that the pretreating agent is quickly contacted and mixed with molten iron.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pretreatment of molten iron is with spouting nitrogen gun solves current pretreatment of molten iron and uses spray gun function singleness, for improving the general agitating unit that sets up alone of mixed effect, has increased equipment cost's technical problem.

In order to solve the technical problem, the utility model adopts the following technical scheme:

nitrogen spraying gun for molten iron pretreatment comprises a gun barrel, wherein at least one spraying cavity is distributed at the bottom of the gun barrel, the tail ends of the spraying cavities are connected with L-shaped spraying pipes, and the pipe orifices of all the L-shaped spraying pipes face to the clockwise direction or the anticlockwise direction.

The further technical proposal is that the inner wall of the L-shaped spray pipe is provided with an anti-oxidation graphite layer.

The further technical proposal is that the L-shaped spray pipe is made of oxidation-proof graphite.

A further technical scheme is that the gun barrel and the outer wall of the spray cavity are both provided with a fire-resistant covering, the L-shaped spray pipe is located on the outer side of the fire-resistant covering, a plurality of anchoring pieces are arranged in the fire-resistant covering, and the anchoring pieces are connected to the outer side wall of the gun barrel.

According to a further technical scheme, a first bearing is arranged on the inner wall of the top of the gun tube, a material tube is movably connected to the top of the gun tube through the first bearing, a treating agent bin is arranged on the material tube, and a nitrogen cylinder is connected to the tail end of the material tube.

The technical scheme is that the supporting frame is provided with openings allowing the fire-resistant covering layer and all L-shaped spray pipes to pass through integrally, the supporting frame is provided with at least two groups of lifting mechanisms, the lifting mechanisms are uniformly distributed around the fire-resistant covering layer, the top of each lifting mechanism is connected with a supporting plate, a nitrogen cylinder is located on the supporting plate, and a second bearing matched with the fire-resistant covering layer is arranged on the supporting plate.

The further technical proposal is that the lifting mechanism is a hydraulic telescopic cylinder.

According to a further technical scheme, the lifting mechanism comprises a driving motor arranged on the supporting frame, the driving motor is connected with an adjusting screw rod penetrating through the supporting plate, and a threaded sleeve matched with the adjusting screw rod is arranged in the supporting plate.

Compared with the prior art, the beneficial effects of the utility model are one of following at least:

1. utilize gas in the barrel to spout the chamber with the pretreating agent to when spouting from L shape spray tube separately, thereby can produce certain reaction force and drive the barrel rotatory, can control the rotation rate through control jet-propelled pressure size, can reach certain stirring effect when the barrel is rotatory, utilize the nimble design of self structure to reach corresponding stirring effect, need not set up agitating unit in addition, reduced equipment cost's input, the functionality is stronger.

2. First bearing can cooperate the rotary motion of barrel, and the material pipe can not rotate thereupon, satisfies service conditions, and elevating system can drive annexes such as backup pad and barrel and wholly reciprocate to stretch into the ladle with the L shape spray tube of barrel below, degree of automation is high.

Drawings

Fig. 1 is a schematic structural view of a nitrogen spray gun for hot metal pretreatment according to the present invention.

Fig. 2 is a schematic sectional view at a-a in fig. 1.

Fig. 3 is a schematic structural view of another embodiment of the nitrogen lance for hot metal pretreatment according to the present invention.

Icon: 1-a barrel; 2-spraying a cavity; 3-L-shaped spray pipes; 4-refractory cladding; 5-an anchor member; 6-a first bearing; 7-a material pipe; 8-treating agent bin; 9-nitrogen gas cylinder; 10-a support frame; 10.1-through opening; 11-a support plate; 12-a second bearing; 13-hydraulic telescopic cylinder; 14-a drive motor; 15-adjusting the screw rod; 16-thread sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description of the present invention and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and therefore, the present invention should not be construed as being limited thereto. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a number" means at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example 1

Referring to fig. 1 to 3, the present embodiment provides a nitrogen lance for molten iron pretreatment, including a barrel 1, an inner cavity is formed in the barrel 1, used for blowing a pretreating agent, at least one spray cavity 2 is circumferentially distributed at the bottom of a gun barrel 1, the tail ends of the spray cavities 2 are connected with L-shaped spray pipes 3, the pipe orifices of all the L-shaped spray pipes 3 face to the clockwise direction or the anticlockwise direction, when the pretreatment agent is sprayed to the spray chamber 2 by the gas in the gun barrel 1 and is sprayed from the respective L-shaped spray pipes 3, thereby it is rotatory to produce certain reaction force at clockwise or anticlockwise and drive barrel 1, can control the rotation speed through control jet-propelled pressure size, can reach certain stirring effect when barrel 1 is rotatory, utilizes the nimble design of self structure to reach corresponding stirring effect, need not set up agitating unit in addition, has reduced equipment cost's input, and the functionality is stronger.

Here, the L-shaped lance 3 is generally provided in an amount of 2 to 6.

As a preferable embodiment, an oxidation-resistant graphite layer is provided on the inner wall of the L-shaped nozzle 3, or the material of the L-shaped nozzle 3 is oxidation-resistant graphite, that is, the whole L-shaped nozzle 3 is an oxidation-resistant graphite tube, the graphite material is chemically inert and corrosion-resistant, does not react with acid, alkali and the like easily, is insoluble in water, and satisfies the use condition.

As a preferred embodiment, the outer walls of the barrel 1 and the nozzle chamber 2 are provided with a refractory coating 4, the refractory coating 4 is generally cylindrical, the L-shaped nozzle 3 is located outside the refractory coating 4, a plurality of anchoring members 5 are arranged in the refractory coating 4, and the anchoring members 5 are connected to the outer side wall of the barrel 1, where the anchoring members 5 may be made of high temperature resistant stainless steel material to deal with the expansion of the steel material at high temperature and damage to the refractory coating 4.

In some other embodiments, the barrel 1 and the anchoring member 5 may be covered with a thermal insulation layer, and the refractory coating 4 is covered on the thermal insulation layer, so as to improve the service life of the barrel 1.

As a preferred embodiment, the inner wall of the top of the gun barrel 1 is provided with a first bearing 6, the top of the gun barrel 1 is movably connected with a material pipe 7 through the first bearing 6, the first bearing 6 can be matched with the rotating motion of the gun barrel 1, the material pipe 7 cannot rotate along with the rotating motion, the use condition is met, a treating agent bin 8 is arranged on the material pipe 7, a pretreating agent is filled in the treating agent bin 8, the tail end of the material pipe 7 is connected with a nitrogen bottle 9, when the pretreating agent is uniformly introduced into the material pipe 7 from the treating agent bin 8, nitrogen discharged from the nitrogen bottle 9 is used as a carrier to blow the pretreating agent into the gun barrel 1 from the material pipe 7, and finally the nitrogen is sprayed out from the L-shaped spray pipe 3, the chemical property of the nitrogen is inactive, the nitrogen hardly reacts.

As a preferred embodiment, the supporting frame 10 is provided with a through hole 10.1 allowing the refractory covering 4 and all the L-shaped nozzles 3 to pass through, the supporting frame 10 is provided with at least two sets of lifting mechanisms, the lifting mechanisms are uniformly distributed around the refractory covering 4, the top of each lifting mechanism is connected with a supporting plate 11, the nitrogen gas cylinder 9 is positioned on the supporting plate 11, the refractory covering 4 penetrates through the supporting plate 11, and therefore the supporting plate 11 is provided with a second bearing 12 matched with the refractory covering 4.

When the device is used, the lifting mechanism can drive the supporting plate 11, the gun barrel 1 and other accessories to integrally move downwards, so that the L-shaped spray pipe 3 below the gun barrel 1 extends into a ladle, the automation degree is high, and the second bearing 12 is used for matching with the rotation of the refractory coating 4.

As a preferred embodiment, the lifting mechanism is a hydraulic telescopic cylinder 13, the bearing capacity is large, and the use condition is met.

In some other embodiments, the lifting mechanism includes a driving motor 14 disposed on the supporting frame 10, the driving motor 14 is connected with an adjusting screw rod 15 penetrating through the supporting plate 11, a thread bushing 16 matched with the adjusting screw rod 15 is disposed in the supporting plate 11, when the driving motor 14 is started simultaneously to drive the adjusting screw rod 15 to rotate in the same direction, due to the presence of at least two adjusting screw rods 15, the supporting plate 11 is limited not to rotate therewith, under the matching effect of the thread bushing 16, so that the rotary motion of the adjusting screw rod 15 is converted into the vertical linear motion of the supporting plate 11, the use requirement is met, and the degree of automation is high.

It should be noted that the driving motor 14 generally adopts a stepping motor or a servo motor, and the stepping motor is an open-loop control element that converts an electric pulse signal into an angular displacement or a linear displacement. In the non-overload condition, the rotation speed and stop position of the motor only depend on the frequency and pulse number of the pulse signal, and are not influenced by the load change, when the stepping driver receives a pulse signal, the stepping driver drives the stepping motor to rotate by a fixed angle in a set direction, namely a stepping angle, and the rotation of the stepping motor is operated by one step at the fixed angle. The angular displacement can be controlled by controlling the number of pulses, so that the aim of accurate positioning is fulfilled; meanwhile, the rotating speed and the rotating acceleration of the motor can be controlled by controlling the pulse frequency, so that the aim of speed regulation is fulfilled. The servo motor can control the speed and position accuracy accurately, and can convert the voltage signal into torque and rotating speed to drive a control object. The rotation speed of the rotor of the servo motor is controlled by an input signal and can quickly respond, the servo motor is used as an actuating element in an automatic control system, has the characteristics of small electromechanical time constant, high linearity, starting voltage and the like, and can convert a received electric signal into angular displacement or angular speed on a motor shaft for output. The servo motor is divided into two categories of direct current servo motors and alternating current servo motors, and is mainly characterized in that when the signal voltage is zero, the signal voltage has no autorotation phenomenon, and the rotating speed is reduced at a constant speed along with the increase of the torque. The stepping motor or the servo motor can achieve the functions of forward and reverse rotation and speed regulation, so that the supporting plate 11 is driven to move up and down at a low speed, the control is convenient, and the use condition is met.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. Nitrogen spraying gun for molten iron pretreatment comprises a gun barrel (1) and is characterized in that at least one spraying cavity (2) is circumferentially distributed at the bottom of the gun barrel (1), the tail end of each spraying cavity (2) is connected with an L-shaped spraying pipe (3), and the pipe orifices of all the L-shaped spraying pipes (3) face clockwise or anticlockwise.

2. The nitrogen lance as claimed in claim 1, wherein the inner wall of the L-shaped lance (3) is provided with an oxidation-resistant graphite layer.

3. The nitrogen lance as claimed in claim 1, wherein the L-shaped lance (3) is made of oxidation-resistant graphite.

4. The nitrogen lance of claim 1, 2 or 3, wherein the lance tube (1) and the lance cavity (2) are provided with refractory coatings (4) on the outer walls, the L-shaped lance tube (3) is located on the outer side of the refractory coatings (4), the refractory coatings (4) are provided with a plurality of anchoring members (5), and the anchoring members (5) are connected to the outer side wall of the lance tube (1).

5. The nitrogen spraying gun for the hot metal pretreatment according to claim 4, wherein a first bearing (6) is arranged on the inner wall of the top of the gun tube (1), a material tube (7) is movably connected to the top of the gun tube (1) through the first bearing (6), a treating agent bin (8) is arranged on the material tube (7), and a nitrogen cylinder (9) is connected to the tail end of the material tube (7).

6. The nitrogen spraying gun for molten iron pretreatment according to claim 5, further comprising a support frame (10), wherein the support frame (10) is provided with a through hole (10.1) allowing the refractory cladding (4) and all L-shaped spray pipes (3) to integrally pass through, the support frame (10) is provided with at least two sets of lifting mechanisms, the lifting mechanisms are uniformly distributed around the refractory cladding (4), the top of each lifting mechanism is connected with a support plate (11), the nitrogen cylinder (9) is located on the support plate (11), and a second bearing (12) matched with the refractory cladding (4) is arranged in the support plate (11).

7. The nitrogen lance for pretreatment of molten iron according to claim 6, wherein the lifting mechanism is a hydraulic telescoping cylinder (13).

8. The nitrogen spray gun for molten iron pretreatment according to claim 6, wherein the lifting mechanism comprises a driving motor (14) arranged on the support frame (10), the driving motor (14) is connected with an adjusting screw rod (15) penetrating through the support plate (11), and a threaded sleeve (16) matched with the adjusting screw rod (15) is arranged in the support plate (11).