KR20020070416A - runner for guiding a flow of liquid metal or slag - Google Patents

Abstract

PURPOSE: A runner which has a long service life by reducing damages of a permanent lining part due to mechanical abrasion, thermal stress or chemical action and has a structure so that the runner is simply repaired. CONSTITUTION: The runner for guiding a flow of molten metal or slag comprises a steel casing(2) which is formed in a long gutter shape; a permanent lining part which is arranged on the bottom of the steel casing(2) and on the inner side of the wall; a variable layer(8) which is arranged on the inner side of the permanent lining part; and a block(10) which is arranged on the inner side of the variable layer(8), wherein the permanent lining part comprises an outer layer(3) which is positioned on the inner side of the steel casing(2); and a refractory material layer(7) which is positioned on the inner side of the outer layer(3), the outer layer(3) in which a duct is installed is formed in a SiC based cast concrete, the duct is connected to an exhaust can having a high height for cooling through natural ventilation, the refractory material layer is formed of fireproofing concrete having a high Al2O3 content, the runner further comprises an anchor(6) one end of which is inserted into the refractory material layer(7) by passing through the outer layer(3), and the other end of which is welded to the steel casing(2), the variable layer(8) comprises a gap which is filled with a crushed granular refractory material or fireproofing felt, and a slab(9) for supporting the gap, and the block(10) comprises a tapered passageway(1).

Description

Runner for guiding a flow of molten metal or slag {runner for guiding a flow of liquid metal or slag}

The present invention relates to a runner for guiding the flow of molten metal or slag, which is formed of a permanent lining portion and a wear lining portion therein, and has a variable layer therebetween to guide the flow of hot molten metal or slag. It is an invention for a runner that can maintain a constant low temperature without deforming at high temperature.

Conventionally, runners exist to guide the flow of molten metal or slag. The runner is used in the furnace, and molten metal or slag made therein after opening the tap opening of the furnace is filled in a ladle or a container through the runner. As it travels through the runner, the molten slag layer, separated from iron and filled in a separate ladle, floats on the molten metal. In this series of processes, runners, which consist of conventional permanent linings and wear linings inside them, are subject to considerable heat shock and aggressive action of molten metal and slag, and wear caused by the flow of iron and slag passing through at high speed. This necessitates a runner structure with long life and simple repair.

In general, in the conventional runner structure, part of the lining is designed for permanent lining and the other part is designed for wear lining. The reason for this is to allow the wear lining which is damaged over time to be completely replaced while the permanent lining can be used for a long time. However, such a structure is still damaged from mechanical wear and thermal stress of the permanent lining and needs a structure that can be used for a longer time.

Various attempts have been made to cool the exterior of the runner in order to protect the runner from heat, but it has not been satisfactory as it is deformed due to heat imbalance between runners. There is still a need for a structure that can cool the runner from the high temperature of molten metal or slag and keep it at a low temperature.

There is a prior art in this regard.

US Pat No. 4508323 (Runner for molten metal) has a patent for a runner structure for water-cooling permanent lining. The runner is not formed in a strong casing but is formed in a recess of a reinforced concrete foundation. And formed in the steel casing have many advantages over that formed in the reinforced concrete. This means that it can be built more quickly, can be preassembled elsewhere, better accessible from all directions, and can be runner mounted in relation to longitudinal thermal expansion. It is an advantage. In addition, the United States patent is different from the present invention does not have a variable layer.

There is a patent application registered in advance with respect to the runner (registration No. 1993-001001; a channel structure for guiding the flow of molten pig iron and a cooling method thereof). This patent is also formed in the reinforcement concrete is different from the present invention formed in a strong casing, such as the US patent. The prior patent also does not have a variable layer, which is different from the present invention.

The present invention has been invented to solve the above problems, an object of the present invention is to provide a runner having a structure with a long life, the permanent lining portion has a long life by reducing damage due to mechanical wear, thermal stress or chemical action It is. In order to achieve the above object, it is characterized in that the variable layer between the permanent lining and wear lining.

1 is a cross-sectional view of an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: passage 2: strong casing

3: outer layer 4: side duct

5: lower duct 6: anchor

7: fireproof layer 8: variable layer

9: slab 10: block

1 is a cross-sectional view of an embodiment of the present invention.

The configuration of the present invention can be largely divided into a strong casing, a permanent lining, a wear lining.

The runner is formed inside the strong casing 2, and the strong casing 2 itself has the form of an elongated trough. This steel casing 2 may, if appropriate, provide linings of insulation therein. The length of this runner structure will vary depending on the situation, but will be approximately 12m to 20m.

A permanent lining part is formed inside the strong casing 2. The permanent lining comprises an outer layer 3 ducts 4, 5, an anchor 6, and a fireproof layer 7.

With respect to the outer layer 3, the outer layer 3 is made of a fireproof material having a relatively high thermal conductivity. At this time, the thermal conductivity is appropriate if it has about 4 ~ 7 (W / m ² * K). The outer layer 3 is generally composed of SiC-based cast concrete.

In the outer layer 3 a plurality of ducts 4 having a rounded cross section extends through the side wall and a plurality of ducts 5 having a rectangular cross section extend through the floor. In this embodiment, although the cross-sectional shape of the duct uses a rounded cross section on the side wall and a rectangular cross section on the bottom, it is not limited thereto. Ducts 4 and 5 are typically formed from thick walled steel pipes that are introduced into the cast concrete. In order to prevent the concrete, which is a constituent of the ducts 4 and 5 and the outer layer 3 from adhering to each other, a layer such as a paint layer and a paraffin layer is formed on the ducts 4 and 5. And by forming the ducts 4 and 5 not limited to the runner end, the ducts 4 and 5 can be expanded under the influence of temperature. The duct 5 at the bottom is separated from the strong casing 2 by a thin insulating layer. The thin insulating layer is generally made of refractory felt.

Ducts 4 and 5 are connected to the forced cooling system. The cooling system may be air-cooled, water-cooled, etc., in which the embodiment uses air-cooled. This is more stable against the risk of explosion when the molten iron breaks through the air-cooled structure than the water-cooled structure. Ducts 4, 5 may be formed to locally cool a portion of the steel casing 2. However, according to the invention it is preferred that the ducts 4 and 5 are connected in the longitudinal direction of the runner. According to another embodiment, the ducts can be connected vertically in the sidewall of the permanent lining. In this case, it is necessary to provide means at the end of the runner for supplying and removing the refrigerant. Although not shown in the figure, the ducts 4 and 5 connect to the forced air cooling system. More specifically, the end of the duct connects to the vent via a manifold. In another embodiment, the general portion of the ducts 4 and 5 may be connected to a sufficiently high exhaust cylinder to maintain natural ventilation. Due to the high thermal conductivity of the outer layer 3, the outer layer is cooled uniformly throughout, despite cooling only around the ducts 4 and 5.

As the permanent lining part, the fireproof material layer 7 is located inside the outer layer 3. The refractory layer 7 is generally composed of refractory concrete having a high Al ₂ O ₃ content. Through this, it has the property of fireproof material.

It looks at the anchor 6 of the permanent lining. The anchor 6 is formed to be inserted into the fireproof material layer 7 through the outer layer 3, the other end is welded to the steel casing (2). As a result, the strong casing 2 and the permanent lining part (outer layer and fireproof material layer) become a strong monolith. The reason for forming a strong monolith is to reduce this, since the outer side of the steel pipes of the ducts 4 and 5 can be mechanically damaged and damage the permanent lining again.

The wear lining part is located inside the permanent lining part. Looking at the wear lining, the wear lining consists of the deformable layer 8, the slab 9 and the block 10.

In order to form the deformable layer 8, the slab 9 is first formed. The slab 9 is generally made of a solid, but may be composed of prefabricated concrete slabs, but is not limited thereto. That is, it may be composed of refractory concrete having a high Al ₂ O ₃ content, but may be composed of a compressed refractory material containing carbon and graphite. The slab 9 is settled at a distance from the fireproof layer 7, which creates a definite gap between the slab 9 and the fireproof layer 7. This gap is filled with one of a group of materials consisting of a dry refractory shred mixture and refractory felt (particularly filled with crushed granular refractory or refractory felt), and the gap thus filled is called the variable layer 8. The deformable layer 8 may act as an expansion joint or a sliding joint for absorbing thermal expansion.

Inside the slab 9 is a block 10 made of refractory cast concrete of a conventionally used form. The block 10 has a tapered passage 1 through which molten metal or slag is guided, the angle of which the tapered passage forms with the vertical plane is 9 degrees. As the block 10 wears, the temperature of the material in the deformable layer 8 will rise further, and in the long term the materials will begin to sinter each other. This can prevent the iron broken through the block 10 and the slab 9 from further penetrating through the deformable layer 8, thereby making the permanent lining unaffected.

As described above, a variable layer is formed between the permanent lining and the wear lining to mechanically protect the permanent lining by absorption of thermal expansion by the variable layer, thereby maintaining a long service life. In addition, by forming a strong casing outside the permanent lining, a simpler repair can be performed, and uniform cooling of the outer layer is achieved through cooling inside the strong casing.

Claims (14)

Strong casing formed in the shape of an elongated gutter A permanent lining portion disposed inside the bottom and the wall of the strong casing; A variable layer disposed inside the permanent lining, Runner for guiding the flow of molten metal or slag comprising a block disposed inside the variable layer The method according to claim 1, The permanent lining portion and the outer layer located inside the strong casing, Runner for guiding the flow of molten metal or slag comprising a fireproof material layer located inside the outer layer The method according to claim 2, Runner for guiding the flow of molten metal or slag, characterized in that the outer layer is formed of SiC-based cast concrete and includes a duct therein The method according to claim 3, Runner for guiding the flow of molten metal or slag, characterized in that the duct is composed of a steel pipe The method according to claim 3, Runner for guiding the flow of molten metal or slag, characterized in that the duct extends in the longitudinal direction of the runner The method according to claim 3, Runner for guiding the flow of molten metal or slag, characterized in that the duct extends in a direction perpendicular to the side wall of the permanent lining The method according to claim 3, A runner for guiding the flow of molten metal or slag, said duct being connected to a forced cooling system The method according to claim 7, The forced cooling system is a runner for guiding the flow of molten metal or slag, characterized in that the forced air cooling system The method according to claim 3, Runner for guiding the flow of molten metal or slag, characterized in that the duct is connected to a high height exhaust pipe for cooling through natural ventilation The method according to claim 2 The refractory layer is runner for guiding the flow of molten metal or slag, characterized in that formed of refractory concrete having a high Al ₂ O ₃ content The method according to claim 2, One end is inserted into the refractory layer through the outer layer, the other end is runner for guiding the flow of molten metal or slag further comprises an anchor welded to the steel casing The method according to claim 1, The variable layer comprises a gap filled with crushed granular refractory material or refractory felt, A runner for guiding the flow of molten metal or slag comprising a slab for supporting the gap The method according to claim 12, Runner for guiding the flow of molten metal or slag, characterized in that the slab is a prefabricated concrete slab The method according to claim 1, Runner for guiding the flow of molten metal or slag, characterized in that the block comprises a tapered passageway