CN211645310U

CN211645310U - Dynamic free molten iron pretreatment desulfurization spray gun

Info

Publication number: CN211645310U
Application number: CN201922424310.7U
Authority: CN
Inventors: 陈学冬; 于林辉; 陈树村
Original assignee: Yingkou Dong Bang Environmental Protection Polytron Technologies Inc
Current assignee: Yingkou Dong Bang Environmental Protection Polytron Technologies Inc
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-09
Anticipated expiration: 2029-12-30

Abstract

The utility model belongs to the technical field of molten iron pretreatment desulphurization, in particular to a dynamic free molten iron pretreatment desulphurization spray gun, wherein a spray gun body (1) comprises a main pipe (2) and a nozzle component (3); a core pipe (4) is fixedly arranged in the main pipe (2); the nozzle component (3) comprises a refractory sleeve (301) and a tail nozzle (302); the refractory casing (301) is fixedly sleeved on the outer wall of the tail nozzle (302); a magnesium agent inlet (6) and a cooling gas inlet (7) are fixedly arranged at the upper part of a flange (5) at the end part of the spray gun body (1); the bottom of the cooling gas cavity (8) is communicated with a cooling gas nozzle (9); a suspension chain (10) is fixedly arranged on the flange (5); a clamping mechanism (11) is fixedly arranged on the suspension chain (10); a lifting frame (12) is fixedly arranged on the clamping mechanism (11). The utility model discloses in air current stirring space, all be showing in the aspect of magnesium powder utilization ratio and desulfurization efficiency and improve.

Description

Dynamic free molten iron pretreatment desulfurization spray gun

Technical Field

The utility model belongs to the technical field of molten iron pretreatment desulfurization, in particular to a dynamic free molten iron pretreatment desulfurization spray gun.

Background

The desulfurization pretreatment of molten iron is an important means for optimizing the process flow and improving the smelting quality in the modern steel industry. Currently, the mainstream desulfurization methods are classified into a blowing method and a KR desulfurization method. The blowing method equipment is complicated, compares in the KR technology, and disposable input is big, simultaneously, because the jetting adopts the powdered magnesium calcium powder technology, the desulfurization flux cost of jetting technology is far higher than the KR technology.

The spray gun is an important component of the blowing desulfurization equipment, the working condition of the spray gun is severe, and thermal shock is frequently borne in molten iron at 1350-1400 ℃. The difference between the physical parameters of the refractory materials of the injection tube and the gun body of the spray gun is overlarge, and the phenomena of cracks, even perforation and the like of the gun body of the spray gun can be caused frequently by thermal stress caused by different temperature gradients in a high-temperature state. The problems of short service life, high cost and the like of the gun body generally exist. In addition, the fixed lance molten iron desulphurization has been used industrially in the seventies of the last century, and has certain limitations in terms of gas flow stirring space, magnesium powder utilization rate and desulphurization efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcomings of the prior art and providing a stable structure, can effectively avoid the slag iron to block up the injection hole, has high utilization rate of particle magnesium and long service life.

In order to solve the technical problem, the utility model discloses a realize like this:

the dynamic free molten iron pretreatment desulphurization spray gun comprises a spray gun body; the spray gun body comprises a main pipe and a nozzle assembly; a core pipe is fixedly arranged in the main pipe; the nozzle component comprises a refractory sleeve and a tail nozzle; the refractory sleeve is fixedly sleeved on the outer wall of the tail spray pipe; a magnesium agent inlet and a cooling gas inlet are fixedly arranged at the upper part of the end flange of the spray gun body; the magnesium agent inlet is communicated with the upper port of the core pipe; the cooling gas inlet is communicated with a cooling gas cavity formed by the outer wall of the core pipe and the inner wall of the main pipe; the bottom of the cooling gas cavity is communicated with a cooling gas nozzle; a fireproof material protective layer is fixedly arranged outside the lower area of the main pipe; a suspension chain is fixedly arranged on the flange; a clamping mechanism is fixedly arranged on the suspension chain; and the clamping mechanism is fixedly provided with a lifting frame.

As a preferred scheme, the utility model discloses fixed helical blade that is equipped with on the refractory material inoxidizing coating.

Furthermore, the bottom of spray gun body is the hemisphere type.

The utility model discloses in air current stirring space, all be showing in the aspect of magnesium powder utilization ratio and desulfurization efficiency and improve. The utility model discloses a granule magnesium and cooling gas carry respectively, and cooling gas forms the protection protective screen to granule magnesium when the jetting, avoids granule magnesium to melt and takes place to block up. The measures greatly improve the reaction environment of the particle magnesium blowing desulfurization, increase the contact area of the magnesium agent and the molten iron, obviously improve the desulfurization effect and reduce the desulfurization cost. In addition, the cooling gas in the cooling gas cavity can effectively improve the operation environment of the core pipe, and has a certain positive effect on prolonging the service life of the gun body.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description. The scope of the present invention is not limited to the following description.

Bottom of window

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1. a spray gun body; 2. a main pipe; 3. a spout assembly; 301. a refractory casing; 302. a tail nozzle; 4. a core tube; 5. a flange; 6. a magnesium agent inlet 6; 7. a cooling gas inlet; 8. cooling the gas cavity; 9. a cooling gas jet; 10. a suspension chain; 11. a clamping mechanism; 12. a lifting frame; 13. a refractory protective layer; 14. a helical blade.

Detailed Description

As shown in the figure, the dynamic free molten iron pretreatment desulphurization spray gun comprises a spray gun body 1; the spray gun body 1 comprises a main pipe 2 and a nozzle component 3; a core pipe 4 is fixedly arranged in the main pipe 2; the nozzle assembly 3 comprises a refractory sleeve 301 and a tail nozzle 302; the refractory casing 301 is fixedly sleeved on the outer wall of the tail nozzle 302; a magnesium agent inlet 6 and a cooling gas inlet 7 are fixedly arranged at the upper part of the flange 5 at the end part of the spray gun body 1; the magnesium agent inlet 6 is communicated with the upper port of the core tube 4; the cooling gas inlet 7 is communicated with a cooling gas cavity 8 formed by the outer wall of the core pipe 4 and the inner wall of the main pipe 2; the bottom of the cooling gas cavity 8 is communicated with a cooling gas nozzle 9; a refractory material protective layer 13 is fixedly arranged outside the lower area of the main pipe 2; a suspension chain 10 is fixedly arranged on the flange 5; a clamping mechanism 11 is fixedly arranged on the suspension chain 10; and a lifting frame 12 is fixedly arranged on the clamping mechanism 11. The utility model discloses fixed helical blade 14 that is equipped with on the refractory material inoxidizing coating 13. The bottom of spray gun body 1 is the hemisphere type, can effectively reduce the impact of molten iron to spray gun body 1 bottom. The helical blade 14 fixedly arranged on the refractory material protective layer 13 can strengthen the stirring effect of the spray gun body 1 on the melt.

The utility model discloses core pipe 4 is fixed nested in being responsible for 2, forms two independent passageways. The magnesium agent inlet 6 is communicated with the core tube 4 for conveying the granular magnesium and the carrier gas thereof. The cooling gas inlet 7 communicates with the cooling gas chamber 8 for delivering inert shielding gas. The refractory casing 301 is fixedly sleeved on the outer wall of the tail nozzle 302 and used for protecting the tail nozzle 302. The magnesium agent is uniformly dispersed and sprayed into the molten iron through the tail nozzle 302. The cooling gas is sprayed out from the cooling gas cavity 8 to form an annular gas barrier for the granular magnesium sprayed out from the tail pipe 302, so that the granular magnesium is prevented from being adhered to the blowing opening to block the blowing opening.

The utility model discloses when jetting, the spray gun is in dynamic state. The technological process and the blowing system do not need to be changed, the spray gun is provided with a clamping mechanism, and a nozzle at the bottom end of the spray gun can randomly and freely move in molten iron by the action force of the self-injected gas during blowing. The freely swinging spray gun changes the vibration of the fixed spray gun into the random movement of the whole spray gun, reduces the internal stress of the spray gun and prolongs the service life of the spray gun. Through the design of cold test and top suspension of a 2m long refractory spray gun, the stress analysis of spray gun swing and the relation of the spray gun swing, buoyancy force applied to the spray gun and the spray gun weight are analyzed in a dimensional mode. The swing of the free spray gun can enlarge the stirring space of the air flow, so that a gas-liquid interface is unstable, bubbles are broken and become small, the liquid is better mixed, the air flow is not easy to break down the liquid to form a channel, and the liquid pool can be stirred by utilizing the potential energy of the air flow better. The free spray gun is used for torpedo ladle desulfurization, and can make up for the shortcoming that the spray gun is not deeply immersed in molten iron. The magnesium powder desulfurizing device is used for desulfurizing granular magnesium, can dispersedly blow in magnesium powder on different points of an iron pool, reduces molten iron splashing and spray gun vibration, and is expected to improve the utilization rate and the desulfurization efficiency of the magnesium powder. The utility model discloses the length of suspension chain 6 is 200 ~ 300mm, and it moves about and can slow down a great deal of negative effects, and reaction efficiency is best. When the desulfurization operation is carried out, when the gun body is required to swing freely, the lifting frame on the clamping mechanism can be started, so that the gun body can also play a role in mixing and stirring molten iron and a desulfurizing agent while the desulfurizing agent is sprayed through the spray pipe of the spray gun.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The dynamic free molten iron pretreatment desulfurization spray gun is characterized by comprising a spray gun body (1), wherein the spray gun body (1) comprises a main pipe (2) and a nozzle assembly (3); a core pipe (4) is fixedly arranged in the main pipe (2); the nozzle assembly (3) comprises a refractory sleeve (301) and a tail nozzle (302); the refractory casing (301) is fixedly sleeved on the outer wall of the tail nozzle (302); a magnesium agent inlet (6) and a cooling gas inlet (7) are fixedly arranged at the upper part of the end flange (5) of the spray gun body (1); the magnesium agent inlet (6) is communicated with the upper port of the core pipe (4); the cooling gas inlet (7) is communicated with a cooling gas cavity (8) formed by the outer wall of the core pipe (4) and the inner wall of the main pipe (2); the bottom of the cooling gas cavity (8) is communicated with a cooling gas nozzle (9); a fireproof material protective layer (13) is fixedly arranged outside the lower area of the main pipe (2); a suspension chain (10) is fixedly arranged on the flange (5); a clamping mechanism (11) is fixedly arranged on the suspension chain (10); and a lifting frame (12) is fixedly arranged on the clamping mechanism (11).

2. The dynamic free molten iron pretreatment desulfurization lance of claim 1, characterized in that: and a spiral blade (14) is fixedly arranged on the refractory material protective layer (13).

3. The dynamic free molten iron pretreatment desulfurization lance of claim 2, characterized in that: the bottom of the spray gun body (1) is hemispherical.