KR200177702Y1 - Raw material injection device in refining furnace - Google Patents

Abstract

The present invention relates to a split feeding device of raw materials for preventing chemical erosion and mechanical wear of local soft wires in the refining furnace, and a chute guide fixed through one side of the dust collecting hood, and a raw material feeding pipe. A chute formed inside the chute guide and having a lower portion of a raw material outlet opening therein; a cooling device passing through the coolant to protect the chute guide and the chute due to the high temperature of the refining furnace in the chute guide and chute; Consists of hydraulic cylinders for forward and backward, which increases the life of the furnace due to local erosion of the refinery, prevents local collision of oxygen lances and raw materials, and contributes to the improvement of working efficiency. As a result, the quality of molten steel can be improved.

Description

Raw Material Injection Device in Refining Furnace

The present invention relates to a raw material charging device of a refining furnace, and more particularly, to a raw material input device capable of dividing the raw material into the raw material in order to prevent chemical erosion and mechanical abrasion of the local lead when adding ferroalloy and auxiliary materials in the refining furnace. It is about.

Refining of stainless steel using a refining furnace is carried out by decarburization and reduction degassing operation by charging molten metal in the refining furnace, and during decarburization, oxygen (O ₂ ), carbon (C), chromium (Cr), Silicon (Si) reacts and the furnace temperature rapidly increases due to the reaction heat caused by the oxidation reaction.

Therefore, for effective decarburization in the furnace, it is preferable to operate in a high temperature range of 1700 ° C or higher. However, when the furnace temperature is increased to 1720 ° C or higher, the furnace protection refractory is rapidly melted and the life of the furnace is significantly reduced. It causes a decrease in productivity.

To prevent this, 5 ~ 6 ton / ch of coolant should be added to manage furnace temperature below 1720 ℃, and ferroalloy for component adjustment and auxiliary material for slag preparation should be added at the same time. Typically, ferrous alloys and subsidiary materials (CaO) are added at about 10 to 15 ton / ch, and the input of these raw materials causes local erosion and mechanical abrasion of lead in the refinery.

5 is a perspective view of a raw material input device of a conventional refining furnace.

As shown in FIG. 5, the refining facility for refining the molten steel 150 is accompanied by a high temperature so that a special fire retardant foil 101 is constructed on the inner wall of the refining furnace 100 in order to minimize melting damage. Since the smelting furnace 100 is manufactured in a state in which the molten steel 150 is vertically positioned, the part where the slag is contacted is specified, and only a certain portion is severely damaged.

In addition, since the ferroalloy and the sub-raw material discharged from the above ground storage container are introduced into the refining furnace 100 through the raw material feeding pipe 50 inclined in the diagonal direction, the raw material falls in the diagonal direction on the refining furnace 100 (60). ) Always strikes the central side of the oxygen lance 40 constantly, causing a problem in which the lance 40 is worn early and needs to be replaced periodically.

In this way, the ferroalloy and the sub-raw material charged in the diagonal direction are concentrated on the refractory wire 101 on the side of the refining furnace 100 as shown in the temporary part of FIG. 5 to prevent the frontal collision and the local chemical reaction between the ferroalloy and the refractory. As a result, a phenomenon in which the service life is significantly shortened occurs.

In addition, the local reaction of each raw material by local input of raw materials starts from the side of the conventional raw material dropping point, and the diffusion reaction is delayed to the whole inside of the furnace, so that the added alloying components are not uniformly distributed in the molten metal until homogenization. The production time is remarkably long, which leads to many problems in productivity reduction and refining unit.

On the other hand, when the raw material is introduced into the refining furnace 100, a part of the raw material 61 is not thrown into the furnace without waste into the fusion splicing 102 on the furnace opening of the refining furnace 100, and expensive raw materials are wasted.

The present invention is to solve the problems as described above, the purpose of the present invention is to divide the raw material when the raw material input such as ferroalloy and secondary raw materials in the refining furnace to prevent chemical erosion and mechanical wear of locally eroded lead It is to provide a raw material input device that can improve the quality by the input.

1 is a raw material input device of the refining furnace according to the present invention,

2 is a perspective view of the raw material input device of the present invention,

3 is a cross-sectional view taken along line A-A of FIG. 2 according to the present invention;

4 is a cross-sectional view of the raw material dispersion device of the raw material input device of the present invention,

5 is a raw material input device diagram of a conventional refining furnace.

Explanation of symbols on the main parts of the drawings

10: feeder 11: chute

12: raw material partitioning plate 14: chute bottom liner

15: weight plate 20: guide roller

21, 22: cooling water line 23: chute guide

30: cylinder 50: raw material input pipe

40: Lance 60: Raw Materials

100: refinery 101: nogu

150: molten steel 200: hood

The present invention for achieving the object as described above,

A chute guide fixedly penetrating through one surface of the dust collection hood, a chute formed in the chute guide connected to the raw material input pipe and having a lower portion of the raw material discharge opening opened, and in the chute guide and the chute. In order to protect the chute guide and the chute due to high temperature, the cooling device passes through the cooling water, and the hydraulic cylinder for the forward and backward of the chute characterized in that it is composed of.

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

1 is a perspective view of the raw material drop by the raw material input device of the refining furnace according to the present invention, Figure 2 is a perspective view of the raw material input device of the present invention, Figure 3 is a cross-sectional view taken along line AA of Figure 2 according to the present invention, Figure 4 Is sectional drawing of the raw material dispersion apparatus of this invention raw material input device.

According to the drawings, the present invention is a chute guide 23 is coupled to and fixed through one surface of the dust collection hood 200, a chute 11 installed inside the chute guide 23, and the chute 11 inside And a hydraulic cylinder (30) for forward and backward of the chute (11).

As shown in FIG. 1, the chute guide 23 is steeply inclined at an angle of 40 to 45 ° with respect to the vertical direction, and the lower portion penetrates one surface of the dust collecting hood 200 by refining. The chute guide 23 of the quadrangular shape is fixed to the hood 200 main body.

The chute 11 is inserted into the raw material input pipe 50 as shown in FIG. 2, and is installed inside the chute guide 23 with the lower part of the raw material discharge port opened. On the bottom surface of the chute 11, a 30 mm thick iron plate is combined with the chute 11 inner wall. When the raw material is introduced into the refining furnace, the chute 11 moves forward into the hood 200 and backwards into the standby state. You will come across.

Forward and backward of the chute 11 is operated by a hydraulic cylinder 30 installed on the chute guide 23. In addition, four guide rollers 20 are provided on the upper, lower and both side surfaces of the chute guide 23 as shown in FIG. 3 in order to prevent fluctuations occurring during the forward and backward movement of the chute 11.

Then, as shown in Figure 2 as a raw material dispersing device for preventing the unbalanced input of the raw material when the raw material is introduced into the refining furnace 100, the fixed pin 13 to the end of the chute bottom liner 14 Install by hinge coupling.

In addition, in order to prevent the fluctuation of the raw material splitting plate 12 generated when the chute 11 for inputting the raw material falls to the furnace port direction of the refining furnace due to its own weight, the multifunctional weight The plate 15 is installed at the rear end of the raw material splitting input plate 12.

To this end, as shown in FIG. 4, the fixed pin 16 is biasedly installed on the weight plate 15 in the opposite direction of the raw material feed plate 12, so that the raw material feed plate 12 is in the refining furnace furnace direction. When falling, the weight plate 15 is rotated down by its own weight so as to span the rear surface of the raw material splitting plate 12. At this time, the release preventing pin 17 is fixed to the chute bottom liner 14 in the opposite direction to limit the rotation of the weight plate 15 by its own weight.

On the other hand, as a cooling device for protecting the chute 11 and the chute guide 23 by the high heat generated in the refining furnace 100, the coolant pipes 21, 22 in the chute 11 as shown in Figs. ) To pass through the coolant only in the 'c' shape, and the coolant pipes 21-1 and 22-1 are also installed in the chute guide 23 to pass through the coolant.

Hereinafter, the operation of the present invention will be described.

When the raw material 60 is injected into the refining furnace 100, the raw material is weighed by the metering equipment of the ground hopper and then dropped by the vibrating feeder to reach the raw material input pipe 50, and the raw material is passed through the chute 11 through the chute 11 ( 100). At this time, since the chute 11 is installed in the chute guide 23 fixedly coupled to the dust collecting hood 200 at an angle of 40 to 45 ° with respect to the vertical direction of the refining furnace, the raw material 60 to be charged is a refining furnace. 100 is smoothly injected into the interior.

When the raw material 60 is introduced into the refining furnace 100, the chute 11 is shrunk by shrinking the cylinder 30 mounted on the upper side of the quadrilateral chute guide 23 of the present invention as shown in FIG. From 23, the dust collecting hood 200 enters the main body to the input position of the raw material. At this time, the chute 11 is moved forward while guided by the guide roller 20 hypothesized in the chute guide 23 at the time of entry, and is in contact with the raw material input pipe 50 even after entry.

Then, the raw material separating input plate 12 bound to the lower end of the chute bottom liner 14 is positioned in the furnace opening direction of the refining furnace by its own weight around the fixing pin 13, whereby the raw material is divided into the raw material inputting plate 12. By dispersing.

On the other hand, in order to prevent the fluctuation generated around the fixing pin 13 when the raw material split plate 12 is operated downward, the weight plate 15 is chute behind the raw material split plate 12 as shown in FIG. It is provided in the bottom liner 14, and the escape prevention pin 17 is tied to the chute bottom liner 14. As shown in FIG.

Accordingly, when the chute 11 is advanced, the raw material splitting plate 12 falls by the weight in the furnace opening direction of the refining furnace, and then the weight plate 15-1 of the dotted line in the standby state is fixed by the weight 16. By rotating in the direction of the furnace ball around the center, it is spread over the back surface of the raw material splitting input plate 12 like the heavy weight plate 15 of the solid line to prevent the shaking.

In this way, the chute 11 enters the dust collection hood 200 and injects the raw material 60 in the downward direction 62 immediately above the raw material feeding place, thereby causing a drop in the raw material 60 by the conventional raw material input device. The wear of the oxygen lance 40 and the falling of the raw material to the fusion splicing 102 on the furnace port of the refining furnace 100 are prevented.

Then, after the input of the raw material is finished, the cylinder 30 is extended to return to the dotted line while the A portion is guided by the dust collecting hood 200 while the weight plate 15 is inclined downward, and the raw material splitting plate 12 and the chute 11 enter the chute guide 23 to be in a standby state.

As described above, the refining furnace raw material input device according to the present invention prevents local erosion of the refining furnace, contributing to the cost reduction of quality by increasing the life of the furnace, and prevents local collision between the oxygen lance and the raw material to prevent By increasing the number of times of use, it contributes to the improvement of working efficiency, and the quality of molten steel can be improved by preventing the dropping of the raw materials in the refinery.

Claims (4)

In the charging device of ferroalloy and secondary raw materials in the refining furnace, A chute guide fixedly inclined to penetrate one surface of the dust collecting hood, a chute installed inside the chute guide and having a lower portion of the raw material discharge opening opened, a raw material introduction pipe installed in the chute, and for forward and backward movement of the chute. Refining furnace raw material input device comprising a chute guide and a hydraulic cylinder connected to the chute. According to claim 1, wherein the chute is installed on the bottom surface of the chute end to prevent the unbalanced input of the raw material, and the weight to prevent the fluctuation of the raw material split plate to be installed at the rear end of the raw material split plate Refining furnace raw material input device comprising a plate and a fixing pin for biasing the weight plate in a direction opposite to the raw material inlet. The refining furnace raw material input device according to claim 1, further comprising guide rollers provided on upper and lower sides of the chute guide and on both sides thereof in order to prevent the chute from moving forward and backward of the chute. The refining furnace raw material input device according to any one of claims 1 to 3, further comprising a cooling device through which the coolant passes through the chute guide and the chute.