KR940003653Y1 - Lance cooling device - Google Patents

Abstract

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Description

Lance chiller

Figure 1a is a front sectional structural view of the lance (Lance) used in the conventional desulfurization operation of molten iron (b) is a cross-sectional view of the AA line of Figure 1a, Figure 2a is a front sectional structural view of the lance according to the present invention (b) is a 2a 3 is a schematic diagram of a lance cooling apparatus according to the present invention, and FIG. 4 is a main structure diagram of the lance cooling apparatus.

* Explanation of symbols for main parts of the drawings

1: Lance 2: Raw material blowing pipe

3: lance nozzle 4: castable

5: mixed cars 6: blown pipes

7: Nitrogen gas automatic opening and closing valve for cooling 8: Lance raising and lowering device

9: platform

10a, 10b, 10c: first, second and third limit switches

The present invention relates to a lance cooling device for a molten iron reductor for introducing a desulfurization raw material into the molten iron for the desulfurization work of the molten iron, more specifically, by installing a nitrogen gas automatic opening and closing valve for cooling in the intake pipe of the upper lance The present invention relates to a lance cooling apparatus which cools a raw material blowing pipe and a castable inside a lance by ejecting nitrogen gas by operating a limit switch after completion of desulfurization of the lance.

In the structure of the lance which deposits the lance in a molten iron and injects desulfurization raw material at the time of desulfurization of a molten iron | metal conventionally, as shown in FIG. 1, the raw material injection pipe 32 is provided in the inside of the lance 31. As shown in FIG. It is fixed by four metal supports 33, the lance nozzle 34 is installed at the lower end of the raw material intake pipe 32, while the refractory caster 35, which is a refractory, is installed at the outer periphery of the lance. Made of structure.

In the conventional lance having such a structure, after the lance 31 is deposited inside the Torpedo Ladle Car, it is deposited at a molten iron temperature of about 1400 ° C., and nitrogen gas (N ₂ Gas) is transferred to the carrier gas. The desulfurization raw material in powder form is introduced into the molten iron to remove the sulfur (S).

At this time, after the addition of the desulfurization raw material, the lance 31 is raised, and the caster fire 35 installed at the outer circumference of the lance 31 in the state where there is no air flow in the raw material intake pipe 32 has a molten iron temperature. Due to the high heat remaining, the high heat is conducted to the raw material intake pipe 32 of the inner metal support 33 so that the cracks as shown in FIG. There is a disadvantage that occurs in the (35), as the above-mentioned cracks caster fire 35 immerses the lance 31 in the molten iron during the desulfurization work to break the hole in the metal support 33 of the lance 31 This is a problem that occurs.

In addition, when the desulfurization operation is completed, the caster 35 is melted by the high temperature of the molten iron when the desulfurization operation is performed again without the high temperature of the caster 35 of the lance 31 having completed the desulfurization work. There were many problems, such as reducing the number of times.

The present invention was devised to improve the conventional problems as described above, the purpose of which is to prevent the melting caused by the high heat remaining in the caster, and to further extend the life of the lance, as well as the raw material in the lance It is to provide a lance cooling device that can prevent the occurrence of crack of the castor fire by excluding the metal support installed in the blown pipe.

As a technical configuration for achieving the above object, the present invention, a raw material blowing pipe is installed inside, a lance nozzle is provided at the lower end thereof, a lance that is a refractory castor is installed at the outer periphery of the raw material blowing pipe. First, second and lance lifting device for moving the lance up and down, and the lance lifting device is mounted on the upper, center and lower side of the platform equipped with the lance lifting device to control the supply of desulfurization material in the molten iron through the lance In the molten iron in the molten iron having a three-limit switch, a nitrogen pipe for cooling is connected to the intake pipe of the lance, the nitrogen pipe for cooling is equipped with a nitrogen gas automatic on-off valve, the nitrogen gas self-opening valve When the lance elevating device electrically connected to the second limit switch is in contact with the second limit switch, the nitrogen gas is automatically opened and closed. The valve is opened to provide a lance cooling device, characterized in that for supplying nitrogen gas for a predetermined time into the raw material blowing pipe of the lance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2a and b is a cross-sectional view of the sectional structure of the lance according to the present invention and a cross-sectional view taken along the line BB of FIG. As the control valve 12, the desulfurization raw material is pressurized, and when the desalination raw material is supplied to the lance 1 through the discharge valve 13, the nitrogen gas through the carrier gas valve (N ₂ , Carrier Gas) of the carrier gas valve (14). Desulfurization raw material is supplied to the lance.

In the configuration of the lance 1 deposited in the molten iron of the Torpedo Ladle Car 5, a raw material inlet pipe 2 is provided inside, and a lance nozzle 3 is provided at the lower end thereof. At the outer periphery of (2), the caster fire 4 which is a refractory is provided.

In addition, as a configuration for cooling the lance 1, the cooling nitrogen gas is automatically cooled in the upper blowing pipe 6 of the lance 1 so as to supply the raw material injection pipe 2 and the lance nozzle 3 automatically. A nitrogen gas automatic opening and closing valve 7 is installed on the nitrogen pipe 7a and connected to the nitrogen pipe 7a. In order to remove this, the upper and upper portions of the lifting platform 9 of the lance elevating device 8 are removed. And the first, second and third limit switches 10a, 10b and 10c are respectively provided downward, so that the lance elevating device 8 and the first, The second and third limit switches 10a, 10b and 10c are in contact with each other to control the cooling nitrogen opening and closing valve 7 for cooling.

Referring to the operation and effects of the present invention made of such a configuration as follows.

As shown in Figs. 2 to 4, when the crosstalk vehicle 5, which is a molten iron transportation container, enters, the lance 1 is deposited in the molten iron of the crosstalk vehicle 5, and the desulfurization raw material is absorbed by the lance nozzle 3. To desulfurization.

Secondly, the desulfurization raw material is pressurized with nitrogen gas supplied through a nitrogen gas control valve 12 in a blow tank 11 and is installed on the lifting platform 9 of the lance lifting device 8. When the lance 1 waiting on the first limit switch 10a descends and comes into contact with the second limit switch 10b installed at the center, the carrier gas valve 14 and the discharge valve 13 are opened to open the nitrogen carrier gas and the desulfurization raw material. Is supplied to the raw material intake pipe 2 of the lance 1, the lance 1 is further lowered and the lance lifting device 8 and the third limit switch 10c is in contact with the lance 1 is stopped Desulfurization agent is sprayed by a predetermined amount into the melt through the lance nozzle (3).

After completion of the desulfurization work as described above, when the lance elevating device 8 contacts the second limit switch 10b when the lance 1 is raised, the carrier gas valve 14 and the discharge valve 13 are blocked. Further, when further raised to contact the portion of the first limit switch 10a, the lance 1 is stopped, and usually until the next work.

At this time, the nitrogen gas automatic opening and closing valve (7) installed in the upper injection pipe (6) of the lance (1), the lance lifting device (8) is moved upward to raise the lance (1) after the desulfurization work is completed. When the second limit switch 10b in the center of the lifting platform 9 comes into contact with each other, the nitrogen gas for cooling the raw material injection pipe 2 and the lance nozzle 3 is opened by an electrical signal generated at this time. Will be supplied.

Therefore, the caster 4 is cooled by the lance 1 by the cooling gas.

In addition, the lance (1) is made of only the raw material intake pipe (2) without installing a metal support with the outer edge of the internal material injection pipe (2) as in the prior art, cracks and lance pore generation due to thermal shrinkage and expansion It can be minimized.

Comparative results of the conventional lance and the lance of the present invention are shown in Table 1 below.

TABLE 1

As described above, the lance in which the cooling device according to the present invention is installed can be prevented from melting by cooling the high heat of the caster fire 4 with nitrogen, thereby improving the number of times of use of the lance 1.

As described above, according to the lance cooling device of the present invention, it is possible to prevent melting caused by the high heat remaining in the caster 4, and the lance 1 can further extend the service life, as well as the inside of the lance 1. By excluding the metal support to be installed in the raw material intake pipe (2) is an excellent effect that can prevent the occurrence of cracks of the castor fire.

Claims (1)

A raw material inlet pipe 32 is provided inside, a lance nozzle 34 is provided at the lower end thereof, and a lance in which a refractory caster 35, which is a refractory, is installed at an outer periphery of the raw material inlet pipe 32 ( 31, the lance elevating device 8 for moving the lance 31 up and down, and the lance 31 is mounted on the upper, the center and the lower side of the platform 9 mounted with the lance elevating device 8; In the molten iron desulfurization apparatus having the first, second and third limit switches 10a, 10b, and 10c for controlling the supply of desulfurization material in the molten iron through a), nitrogen for cooling on the inlet pipe 6 of the lance. A pipe 7a is connected, and the nitrogen gas opening / closing valve 7 is mounted on the cooling nitrogen pipe 7a, and the nitrogen gas opening / closing valve 7 is electrically connected to the second limit switch 10b. When the lance elevating device 8, which is connected and moved upward, is in contact with the second limit switch 10b, the nitrogen gas is automatically opened. A lance cooling device, characterized in that the closing valve (7) is opened to supply nitrogen gas to the inside of the raw material intake pipe for a predetermined time.