KR920008672B1 - Melting lance and method of torpedo ladle car - Google Patents

Abstract

An internal metal dissolution lance for a molten pig iron carrying vessel forms a vertical nozzle (12) and five to nine radical inclined nozzles (11) with thirty to ninety degree angle of inclination on its lower part. The dissolution lance is round cylindrical type, is able to be moved up and down, and connected with the air supply line (3) on it's upper part. The internal virgin metal dissolution method includes a step to put coke, an ignition agent, and burning materials in a Torpedo Ladle Car (TLC), a step to descent the lance until the distance between the end of the vertical nozzle of the lance and the break surface is three hundred to seven hundred mm, and a step to blow air in the TLC through the lance.

Description

Internal now melting lance of molten iron container and its method

1 is a state of use showing the state of dissolving the hot water coagulation and the inner wall attachment in the Topedo ladle car using a lance in accordance with the present invention.

2 is a sectional view taken along the line A-A of FIG.

3 is a bottom view of the illustrated lance of FIG.

* Explanation of symbols for main parts of the drawings

1: Torpedo Ladle Car 4: Steamed noodle

5: inner wall attachment 6: coke

7: combustion material 10: lance

11: oblique exposure 12: vertical nozzle.

The present invention relates to a lance and a method for dissolving the inner current of the molten iron carrier vessel used to repair and transport the molten iron drawn from the blast furnace plant of the steelworks to the steel mill, more specifically, topedo The present invention relates to a lance and a method for dissolving the surface coagulation and / or the inner wall attachment in a torpedo ladle car.

Conventionally, when the steelmaking molten iron is repaired on a transport container, the Topedo Ladle Car (hereinafter referred to as “TLC”), the molten iron temperature is maintained at a high temperature, but there is no problem. De-Si [de], de-S [S] and de- [P] treatments are widely performed in the interior, and these treatment processes are also rapidly developing.

Therefore, the molten iron temperature is lowered by the endothermic reaction due to the use of deregulator, degreaser, dephosphorizer, etc. during the preliminary molten iron treatment in the TLC, and the molten agent is melted to increase viscosity, resulting in poor fluidity. As the surface solidification phenomenon and slag adhesion of the inner wall accumulate, the descent of the lance becomes impossible, so preliminary treatment of the molten iron and steelmaking is impossible, and the amount of repair is insufficient due to the reduction of the TLC content. Therefore, there is a need in the art for a method for preventing TLC inner surface coagulation and TLC inner wall slag adhesion.

In order to solve the above problems, an attempt has been made to change the slag composition by adding fluorite to the slag as a solvent during the degassing treatment, or by adjusting the basicity using carbide, but there is no effect and the fluidity is good immediately after the desulfurization treatment. It was pre-exposed, but the TLC outlet was narrow and could not be completely excused.

In addition, an attempt was made to dispose of the residual slag after tilting the molten iron in the TLC in the steelmaking process by tilting the TLC 360 ° in the after-treatment plant, but it is impossible to completely dispose of the highly viscous slag attached inside the TLC. It was.

Accordingly, the present invention is to effectively dissolve the TLC water surface coagulum and / or adherents attached to the TLC inner wall by introducing a coke (coke) and / or a combustion material as a complexing agent in the TLC and blowing oxygen into the interior. have.

Hereinafter, the present invention will be described in detail.

The present invention relates to a lance for dissolving these coagulates and / or deposits when slag and molten iron is attached to the surface of the surface during the process of repairing the molten iron in the molten iron container vessel TLC, and described through these drawings. As follows.

As shown in FIG. 1, the lance 10 in accordance with the present invention is fixed to the frame 2 in a hoist so that up and down movement is possible at least in the TLC 1, and an oxygen supply valve 3a and It is connected to an oxygen supply line 3 provided with an oxygen control valve 3b.

As shown in FIGS. 2 and 3, the lance 10 has a plurality of inclined nozzles 11 and one vertical nozzle 12 formed on the bottom thereof, and the quantity of the inclined nozzles 11 is lower. 5-9 are preferred, most preferably 8, as in FIGS. 2 and 3.

In addition, the inclination of the inclined nozzle 11 can be changed according to the form of the coagulum and / or deposits in the TLC as in the selection of the quantity thereof, preferably 30-90 °, of which 50 ° is the most preferable. Do.

In addition, the inclined nozzle 12 is preferably formed slightly longer than the inclined nozzle 11.

In addition, in the invention, when slag and molten iron are attached to the surface of the surface of the molten iron during the process of repairing and treating the molten iron vessel, the TLC (1) molten iron, these melted solids 4 and / or the inner wall attachment 5 are dissolved. A method comprising the steps of: injecting coke (6) and / or a combusting material, which is a complexing agent, into a hot water surface in said TLC (1); The lance 10 formed with 5-9 inclined nozzles 11 and one vertical nozzle 12 inclined at 30-90 ° has a distance of 300-700 mm between the front end of the vertical nozzle 12 and the hot water surface. Lowering as much as possible; And blowing the oxygen through the lance 10 at a flow rate of 5-15 Nm ³ minutes and a pressure of 5-25 Kg / cm ² .

The coke 6 and the combustion material 7 injected into the hot water surface in the TLC 1 are burned by the injected oxygen to dissolve the hot water coagulated product 4 in the TLC 1 and to raise the ambient temperature therein. As a role, the combustion material furnace 7 is preferably a piece of wood of 1500 mm or less.

The inclination angle of the inclined nozzle 11 varies depending on the solidification and / or the shape of the attachments 4 and 5 in the TLC 1, and when the angle is less than 30 °, the inner wall attachment 5 of the TLC 1 is removed. Since it is difficult to dissolve and when it becomes 90 degrees or more, since it will result in blown from the bottom part to the top, it is preferable that the inclined nozzle 11 is inclined at 30-90 degrees, and the most preferable inclination is 50 degrees.

In addition, the amount of the inclined nozzle 11 may also vary depending on the solidification and / or adhesion materials 4 and 5 in the TLC, as in the inclined angle, and when the number is 5 or less, the inner wall Complete dissolution of the deposit 5 is impossible, and if the number is 9 or more, the blowing pressure drops, so about 5-9 is preferable, and the most preferable quantity is 8 as shown in FIG. 2 and FIG. .

The reason for limiting the distance between the tip of the vertical nozzle 12 and the water surface to 300-700 mm is that the nozzle may be damaged by heat at 300 mm or less, and when it is 700 mm or more, the oxygen blowing effect is deteriorated. The most preferred distance is 500 mm.

The reason why the flow rate is 5-15 Nm 3 / min is that there is no oxygen blowing effect at 5 Nm 3 / min or less, and above 15 Nm 3 / min is a problem in equipment, and the supply pressure is 5-25 Kg / cm 3. One reason is also the same as the reason for the limitation of the flow rate.

In the present invention, the coke (6) and the combustion material (7) is injected into the hot water, and then blowing oxygen to dissolve the slag and now is the heat of combustion and TLC of the coke (6) and the combustion material (7) by the blown oxygen Fe, FeO, CaO, SiO₂, MnO, MgO, Al₂O₃, Sio _2, etc., which are solidified inside, and Fe accounted for 60% of these components, and Fe is oxidized with oxygen when oxygen is injected. It is based on the heat of oxidation generated as

As described above, the slag and the present is dissolved by the method of injecting coke and blowing oxygen, and then slag skimmer (Slag Skimmer) after completely discharging the slag and re-solidification according to the time delay until steel removal It is desirable to avoid. Hereinafter, a description will be given of the oxygen injection method according to the T.L.C internal failure state standardized by the experiment over several times.

1) T.L.C's hot water solidification state

Thirty kilograms of wood, 40 kilograms of coke, and 20 kilograms of rice husk are introduced into the TLC, and the lance with one vertical nozzle and eight inclined nozzles is lowered so that the distance between the tip of the vertical nozzle and the tap surface is 500 mm. Oxygen is blown and dissolved at a flow rate of 6Nm 3 / min and a pressure of 10Kg / cm 2.

Next, 40 Kg of rice husk is added to blow in the desorbing agent for the dehydration reaction and to prevent coagulation.

2) Chartered Car Status of T.L.C

Inject 30Kg coke into T.L.C, blow out the desorbent, inject and dissolve oxygen under the same condition as the complete coagulation condition of water in the above 1), and add 40Kg of rice hull to prevent recoagulation.

3) T.L.C's chartered ship remnant is less than 100 tons

30Kg of coke is added to T.L.C. Oxygen is injected and dissolved under the same conditions as the complete solidification state of water in item 1). 40Kg of rice husk is added to prevent resolidification.

4) Charter Tolerance of T.L.C

40Kg of wood chips, 60Kg of coke, and 30Kg of rice husk were added into the TLC, except that the distance standard between the tip of the vertical nozzle and the TLC bath surface was changed to the distance between the tip of the vertical nozzle, the tip and the bottom of the TLC. 40Kg of rice husk is added to dissolve and dissolve oxygen in the same condition as the condition of complete coagulation. As described above, the present invention effectively injects coke and / or combustion material, and injects oxygen using one vertical nozzle and a lance formed with a plurality of inclined nozzles, thereby effectively removing the coarse water and / or internal deposits in the TLC. It has an effect that can be dissolved.

Claims (2)

At least up and down movements are maintained in a cylindrical shape, and an upper surface thereof is connected to the oxygen supply line 3; And the inner surface of the molten iron container of the molten iron container, characterized in that the bottom portion is formed with one vertical nozzle 12 and 5-9 inclined nozzles (11) extending radially inclined at 30-90 °. In the case of slag and molten iron in the process of repairing molten iron in the TLC 1, which is a molten iron container, when the molten iron is attached to the surface of the melt, the surface of the solidified material 4 and / or the wall attachment 5 are dissolved. Injecting coke (6) and a combustion material (7), which are complexing agents, into the hot water surface in the TLC (1); The distance between the tip of the vertical nozzle 12 and the hot water surface is 300-700 mm for the lance 3 formed with 5-9 inclined nozzles 11 and one vertical nozzle 12 which are formed to be inclined at 30-90 °. Lowering as much as possible; And blowing oxygen through the lance (3) at a flow rate of 5-15 Nm 3 / min and a pressure of 5-25 Kg / cm 2.