KR100646253B1 - Refractory blocks of heat treating furnace - Google Patents

Abstract

A refractory block of a furnace is disclosed. The refractory block of such a heating furnace is provided with a heat insulating material which prevents heat from being transferred to the cooling beam by surrounding the outer surface of the cooling beam of the heating furnace, and is provided outside the heat insulating material so that the heat of the heating furnace is applied to the heat insulating material and the cooling beam. And a refractory body for preventing the transfer, and at least one anchor member for integrally connecting the refractory body and the heat insulating material to the cooling beam. Such a refractory block can be easily connected to the cooling beam by inserting the anchor into the refractory block to improve the structure, thereby shortening the air for the repair of the furnace and extending the period of the repair, thereby reducing the construction cost and the production cost. There is an advantage. In addition, the refractory block is in the form of a ceramic castable in the form of an amorphous powder using organic and inorganic binders by processing ceramic fibers. Since the ceramic fibers are formed in the form of a bonded structure, the refractory blocks are spalled even in thermal shocks such as quenching and quenching. There is no crack phenomenon, which brings the life improvement of the furnace than the existing refractory, and has the advantage of having a property of a combination of heat insulation and fire resistance.

Furnace, Cooling Beam, Skid Pipe, Post Beam, Refractory Block, Castable, Anchor, Joint, Welding, Ceramic

Description

REFRACTORY BLOCKS OF HEAT TREATING FURNACE

1 is a state diagram showing a state in which the slab is transported by the skid pipe and the post beam in the furnace according to the prior art.

2 is a cross-sectional view showing the internal structure of the skid pipe shown in FIG.

3 is an exploded perspective view showing a refractory block applicable to a post beam of a heating furnace according to a preferred embodiment of the present invention.

4A and 4B are cross-sectional views of the refractory block shown in FIG. 3.

5 is a cross-sectional view taken along the line VI-VI of FIG. 4A.

6a to 6c are perspective views showing various embodiments of the fixing anchor shown in FIG.

7 and 8 are cross-sectional views showing the junction of the refractory block shown in FIG.

FIG. 9 is a sectional view showing a state in which the refractory block shown in FIG. 3 is applied to a skid pipe. FIG.

10 is an exploded perspective view of a refractory block applicable to a post beam of a furnace according to another preferred embodiment of the present invention.

11 is a cross-sectional view of the refractory block shown in FIG. 12.

12 is a cross-sectional view taken along the line XIII-XIII of FIG. 11.

FIG. 13 is a sectional view showing a junction of the refractory block shown in FIG. 10; FIG.

14 to 16 are cross-sectional views showing a state in which the refractory block shown in FIG. 13 is applicable to a skid pipe.

17A is a cross-sectional view of a refractory block in accordance with another preferred embodiment of the present invention.

FIG. 17B is a sectional view of another embodiment of the junction of the refractory block shown in FIG. 17A; FIG.

18 is a sectional view taken along line XIX-XIX in FIG. 17A;

The present invention relates to a refractory block of a hot rolled furnace, and more particularly, by improving its structure, shortening air for repair of a furnace to heat the slab and extending the period of repair to reduce construction costs and reduce production costs. It relates to a refractory block of one furnace.

In general, a heating furnace in a hot rolling steelmaking process is a device for heating the slab cast in the casting process to the temperature required for rolling.

Such a furnace is required to heat the slab at a high temperature so as to facilitate rolling, and therein, a refractory block for withstanding high temperature and a cooling device for appropriately cooling the refractory block are provided.

1 and 2 schematically show the interior of such a conventional furnace. As shown, a plurality of skid pipes (2) for supporting and transporting the slab (1), a post beam (3) for supporting the skid pipes (2), and the skid pipe (2) inside the heating furnace And a castable irregular refractory block 16 provided on the surface of the casing to prevent the skid pipe 2 from being deteriorated and damaged from high heat and scale flowing down from the slab 1.

And the cooling water 11 flows in the skid pipe 2, and it cools suitably. In addition, the outer peripheral surface of the skid pipe (2) is provided with a ceramic wool 14 performs a heat insulating function.

In addition, a plurality of anchors 13 protrude from the outer circumferential surface of the skid pipe 2. Thus, the refractory block 16 can be fixed to the skid pipe 2 by an anchor 13.

The skid pipe 4 having such a structure is first constructed with an anchor 13 and a ceramic wool 14 on its outer circumferential surface, and then a hollow cylindrical mold 15 is installed around it, and the castable refractory material 16 is driven by a pressure feeder. It is injected and molded to make a refractory block.

However, such a conventional construction method has a problem in that the repair work is narrow in the heating furnace and is made in a closed space, which imposes a burden on the working environment for the worker and lowers the efficiency.

In addition, the repair work of the furnace is generally carried out at intervals of about 1 to 2 years, the refractory for the skid pipe or post beam should be constructed to withstand long periods in the high temperature (about 1400 ℃) atmosphere in the furnace.

However, in the conventional method as described above, due to the limitation of the repair period, it is difficult to secure sufficient curing time and drying time for the construction refractory material, and the internal vapor pressure during the heating causes the explosion of the castable refractory material and cracks, and it is local during use. There is a problem that causes the drop of phosphorus refractory.

In addition, the ceramic wool inserted in the middle of the castable refractory and the pipe in order to ensure insulation has no fixed shape due to the fragility and elasticity of the structural strength, and there is little strength, causing dimensional deviation during construction. During long-term use, sintering and squeezing may occur due to high temperature, resulting in structural problems in the castable refractory.

Particularly, due to the difference in coefficient of linear expansion between castable refractory and ceramic wool at 1400 ℃ of heating furnace, oxidation phenomenon occurs on the outer surface of the skid pipe and anchors due to the gas infiltrating into the interface during long-term use. The loss of refractories occurs due to the loss of bearing capacity.

As described above, the conventional refractory block for skid pipes has a high workload and causes operation instability by raising the temperature of the cooling water inside the skid pipes due to the dropping of the refractory, and causes cost increase by shortening the repair cycle of the refractory block in the furnace. There is this.

In addition, Korean Patent Laid-Open Publication No. 2001-0048087, filed under the name of "Refractory block for a skid pipe in a heating furnace and its manufacturing method", also discloses a refractory block for preventing deterioration of such a skid pipe.

However, in the above invention, since the fixing anchor is formed in a semi-circular member in advance, a separate anchor installation work is required, and the construction and dismantling work for such anchors and steel strips is required, as well as curing and firing time are required. And, there is a problem in that the weight is very high due to the use of the castable is very high.

The present invention is to solve the conventional problems as described above, the object of the present invention is to insert the anchor from the outside of the refractory block by applying a method of welding to the cooling beam to the refractory block of the furnace to simplify the work process To provide.

In order to achieve the above object, a preferred embodiment of the present invention includes an insulation for preventing heat from being transferred to the cooling beam by surrounding an outer surface of a cooling beam of a heating furnace; A refractory body provided outside the heat insulating material to prevent heat from the heating furnace from being transferred to the heat insulating material and the cooling beam; And it provides a refractory block including at least one anchor member for connecting the refractory body and the heat insulating material integrally and fixed to the cooling beam.

Hereinafter, with reference to the accompanying drawings will be described in detail the refractory block of the heating furnace according to an embodiment of the present invention.

As shown in Figure 3, the refractory block 100 proposed by the present invention is provided with a heat insulating material 101 for performing a heat insulating function by surrounding the cooling beam 4 of the heating furnace therein, the heat insulating material 101 It is provided on the outer surface of the) includes a refractory body 102 to prevent the transfer of high temperature heat.

In the refractory block having such a structure, the heat insulating material 101 preferably includes ceramic wool. Thus, heat is prevented from being transferred to the cooling beam 4.

The refractory body 102 is preferably formed of mullite alumina and silica, and fired at about 1000 ° C. or higher.

In addition, the refractory body 102 has a semi-circular structure of two upper and lower portions, and as shown in Fig. 4a, is bonded to each other using an adhesive, preferably a mortar (103).

The refractory body 102 has a plurality of holes 110 penetrate inwards thereof, and the holes 110 are also formed in the ceramic wool 101.

In addition, a step 111 is formed in the hole 110. Therefore, the anchor 120 is inserted into the hole 110 so that the refractory body 102 and the ceramic wool 101 can be integrally fixed to the cooling beam 4.

The anchor 120 is composed of a head portion 121 that is caught on the step 111 and the leg portion 122 protruding from the head portion. The interior of the anchor 120 has a hollow shape by forming a space.

Accordingly, after the anchor 120 is inserted into the hole 110, a welder and a welding rod (not shown) are inserted through the inside of the anchor 120, and then welded to the leg 122. An end portion and an outer circumferential surface of the cooling beam 4 are integrally connected to each other to form a weld portion 160.

As a result, the ceramic wool 101 and the refractory body 102 may be integrally fixed to the outer circumferential surface of the cooling beam 4 by the anchors 120.

In this case, as shown in FIG. 4B, the ceramic wool 101 may form a deeper inclination at a portion through which the hole 110 penetrates.

Referring to the process of integrally fixing the refractory block 100 to the cooling beam 4 by the anchor 120 in detail, first remove the existing refractory that was constructed in the cooling beam 4, the refractory body 102 ) And the surface of the cooling beam (4) to clean the welding beam (4) well.

Then, one refractory body 102 is seated on the portion of the cooling beam 4 to be constructed, and the anchor 120 is inserted into the hole 110. After inserting the anchor 120, while using the welder and the welding rod (not shown) while pressing the head 121 of the anchor 120 firmly as shown in Figure 5 the end of the leg 120 and the cooling beam ( By welding each other 4), one refractory body 102 is fixed to the cooling beam 4.

Thereafter, the other one refractory body 102 is welded and fixed to the cooling beam 4 as described above, and then the portion of the hole 110 into which the anchor 120 is inserted is closed using a material similar to that of the refractory block 102.

Through this process, the refractory block 100 may be integrally fixed to the cooling beam 4, and may be easily repaired by assembling or releasing the anchor 120 as necessary.

In addition, the anchor 120 may have various shapes. That is, as shown in FIG. 6A, the anchor 120 has a square head shape, a rectangular shape as shown in FIG. 6B, or a circular head 121 as shown in FIG. 6C. )

At this time, the inlet of the holes 110 of the refractory block body 102 preferably has the same shape as the shape of the head 121, but may have various shapes such as a pentagonal hexagon other than the illustrated shape.

On the other hand, as shown in Figure 7 and 8, the upper and lower refractory body 102 is integrally bonded to each other by forming the bonding portion (102a) by the adhesive.

Such an adhesive preferably comprises mortar, which can of course be replaced with the same material used to close the holes 110 of the refractory body 102.

When the refractory body 102 is constructed in this way, it is preferable to prevent heat from penetrating by blocking the gap using an adhesive so as to exert a heat insulating effect.

This adhesive forms a junction 103, which may be formed in a shape as shown in FIG. 7.

That is, it is also possible to form the protrusion part 102a which the center part of the junction part 103 protrudes to the lower part or upper part.

In addition, as shown in FIG. 9, the junction 102a may have a stepped portion 102a formed in the middle thereof.

The construction of the refractory block having a dual structure of the present invention as described above is very simple, the dismantling operation is also simple, during the dismantling operation can be simply dismantled only a part of the partially damaged block, clean without the need to clean the cooling beam Can be dismantled.

In addition, the refractory block according to the present invention has excellent thermal insulation because the high-temperature ceramic fibers are made of a bonding structure, and does not cause cracks and chipping due to heat shock, thereby improving the life of the water-cooled beam.

In addition, since the block of the present invention is made of a ceramic fiber, the specific gravity is very low compared to the conventional castable block, so it is lightweight, so it is excellent in workability in a narrow or high space.

And, Figure 9 shows that the refractory block is applied to the skid pipe as another preferred embodiment of the present invention. As shown, the refractory body 102 and the heat insulating material 101 is mounted to the lower portion of the skid pipe 4, the anchor 120 is welded to the skid pipe 4 through the hole 110 to weld (160) It has a structure to form.

Therefore, the refractory body 102 and the heat insulating material 101 may be integrally fixed to the skid pipe 4 by the anchor 120.

Meanwhile, FIGS. 10 to 13 show a refractory block applicable to a post beam of a heating furnace according to still another preferred embodiment of the present invention.

As shown, the refractory block 200 according to the present embodiment has a structure similar to the refractory block applied in the above embodiments, but there is a difference having a single structure that is not provided with a heat insulating material therein.

That is, the refractory block 200 includes upper and lower refractory bodies 202 disposed to surround the cooling beam 4, and iron pieces 204 provided in the circumferential direction inside the upper and lower refractory bodies 202. And an anchor 205 which integrally fixes the cooling beam 4 and the refractory body 202 by welding to the iron piece 204.

In addition, a plurality of welding holes 220 are drilled in the refractory body 202 and the iron pieces 204, and after the welding rod 210 is inserted through the welding holes 220, the iron pieces 204 are cooled by a cooling beam ( 4) to be fixed integrally.

In addition, the upper and lower refractory bodies 202 are integrally joined by joining portions 202a such as mortar.

At this time, the junction portion 202a has a concave-convex shape as shown in FIG. 11 or a stepped shape as shown in FIG. 13 as in the above-described embodiments.

The shape of the joint 202a can be appropriately selected according to the product specification and the working conditions.

14 to 16 illustrate various types of cooling beams to which such a refractory block is applied. That is, in FIG. 14, a pair of cooling beams 4 forms a pair, and a pair of refractory bodies 202 is formed outside the pair of cooling beams 4, and the iron piece 204 and the refractory body 202 are anchored. The one fixed by the 205 and the junction part 202a is shown.

FIG. 15 shows an example applied to a skid pipe, and a refractory body 202 is provided below the skid pipe 4, and the iron piece 204 and the cooling beam 4 are integrally fixed by the anchor 205. It has a structure.

And an oval refractory block is shown by FIG. That is, the pair of cooling beams 4 are arranged side by side, the refractory body 202 is provided on the outside thereof, and some sections of the refractory body 202 are removed. The iron piece 204 has a structure in which the iron piece 204 is integrally fixed to the cooling beam 4 by the anchor 205.

Meanwhile, another embodiment of the present invention is shown in Figs. 17A, 17B and 17C. In this embodiment, the heat insulating material 230 is provided inside the refractory body 202 to surround the cooling beam 4 to perform a heat insulating function.

That is, the refractory block 200 includes upper and lower refractory bodies 202 disposed to surround the cooling beam 4, and iron pieces 204 provided in the circumferential direction inside the upper and lower refractory bodies 202. And an anchor 205 which integrally fixes the cooling beam 4 and the refractory body 202 by welding to the iron piece 204.

In addition, a plurality of welding holes 220 are drilled in the refractory body 202 and the iron pieces 204, and after the welding rod 210 is inserted through the welding holes 220, the iron pieces 204 are cooled by a cooling beam ( 4) to be fixed integrally.

In addition, the upper and lower refractory bodies 202 are integrally joined by joining portions 202a such as mortar.

At this time, the junction portion 202a has a concave-convex shape as shown in FIG. 17A or a stepped shape as shown in FIG. 17B as in the above-described embodiments.

The shape of the joint 202a can be appropriately selected according to the product specification and the working conditions.

In addition, the heat insulator 230 may be made of ceramic paper or blanket, or may be made of other materials for heat insulation.

As described above, the refractory block according to an embodiment of the present invention improves its structure, thereby easily connecting the anchor to the cooling beam by inserting the refractory block, thereby shortening the air for repair of the furnace and extending the repair period. There is an advantage that can reduce the cost and production cost.

In addition, the refractory block is in the form of a ceramic castable in the form of an amorphous powder using organic and inorganic binders by processing ceramic fibers. Since the ceramic fibers are formed in the form of a bonded structure, the refractory blocks are spalled even in thermal shocks such as quenching and quenching. There is no crack phenomenon, which brings the life improvement of the furnace than the existing refractory, and has the advantage of having a property of a combination of heat insulation and fire resistance.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it is within the scope of the present invention.

Claims (12)

An insulating material surrounding the cooling beam outer surface of the heating furnace to prevent heat from being transferred to the cooling beam; A refractory body provided outside the heat insulating material to prevent heat from the heating furnace from being transferred to the heat insulating material and the cooling beam; And At least one anchor member for integrally connecting the refractory body and the heat insulating material to be fixed to the cooling beam, A plurality of holes are formed in the refractory body and the heat insulating material so that the anchor is inserted and fixed through the hole to connect the refractory body and the heat insulating material integrally. The refractory body is composed of the upper and lower refractory body, the upper and lower refractory body is a refractory block that is integrally bonded to each other by making a joint by an adhesive. delete A refractory body provided to surround the outer surface of the cooling beam of the heating furnace to block heat from being transferred to the cooling beam; At least one connection piece provided on an inner surface of the refractory body; And At least one anchor member protruding from the at least one connection piece to be connected to the refractory body to be fixed to the cooling beam, A plurality of holes are formed in the refractory body so that the anchor is inserted through the hole and fixed to the connecting piece so that the refractory body and the connecting piece are integrally connected. The refractory body is composed of the upper and lower refractory body, the upper and lower refractory body is a refractory block that is integrally bonded to each other by making a joint by an adhesive. delete The method according to claim 1 or 3, The anchor is a refractory block consisting of a head portion and a leg portion protruding from the head portion and inserted into the hole. The method of claim 5, The head of the anchor is a refractory block selectively comprises a shape of any one of rectangular, square or circular. delete The method according to claim 1 or 3, The joint portion selectively includes any one of a shape in which the irregularities are formed in the middle portion or the shape in which the step is formed. The method according to claim 1 or 3, The adhesive block comprises a mortar. The method according to claim 1 or 3, The refractory body is a refractory block made of mullite alumina and silica. The method of claim 1, The insulating material is a refractory block selectively comprises any one of ceramic paper, blanket, ceramic fiber, vermiculite, or glass fiber. The method according to claim 1 or 3, Refractory block to perform a warming function by further comprising a heat insulating material between the refractory body and the cooling beam.

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