KR100584724B1 - Refractory block manufacturing method for skid pipe of heating furnace - Google Patents

Abstract

The present invention relates to a refractory block for a skid pipe of a furnace and a method of manufacturing the same, which can quickly and easily be installed on a skid pipe, thereby reducing the work load and extending the furnace repair cycle. It is about.

The present invention is a refractory block for protecting the skid pipe of the hot-rolled heating furnace in the steelmaking process, a preliminary production of a plurality of refractory semicircular members formed in two divisions, the refractory semicircular members are made of a heat-resistant castable and a heat insulating castable In addition, the inner side of the insulating castable to be in contact with the skid pipe, and the iron block is installed, and the refractory block for the heating furnace skid pipe, characterized in that the welded through the hole through the refractory semi-circular member and the skid pipe combined. Provide a method.

According to the present invention, by adopting the block construction method of the refractory for the furnace skid pipe, the construction method is simple, not only shorten the repair period of the furnace at least 2-3 days, but also improve the construction quality and insulation insulation By applying to prevent the breakage of anchors and refractory damage fall off, the refractory repair cycle of the furnace can be extended by about 1.5 times or more.

Hot Rolled Furnace, Skid Pipe, Refractory Block, Heat Resistant Castable, Insulated Castable

Description

REFRACTORY BLOCK MANUFACTURING METHOD FOR SKID PIPE OF HEATING FURNACE}

1 is a schematic diagram showing a conventional skid pipe and slab in the furnace;

2 is a cross-sectional view showing a state of constructing a refractory block for a skid pipe in a conventional furnace;

3 is an explanatory view showing a state in which refractory is dropped in a refractory block for a skid pipe in a conventional furnace;

4 is an exploded perspective view of a refractory block for a skid pipe according to the present invention;

5 is an exemplary view for explaining a method of manufacturing a refractory block for skid pipe according to the present invention;

6 is a schematic diagram of a refractory block and slab for a skid pipe according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... semi-circular members 20 ... Insulated castable

30 .... heat resistant castable 40 ....

45 .... Anchor 50 .... Fixture

60 ... hole 70 ... welder

100 ... skid pipe 110 ... skid pipe member

112 ... coolant

The present invention relates to a refractory block that protects a skid pipe of a hot rolled furnace in a steelmaking process, and a method of manufacturing the same. More specifically, it is possible to quickly and easily install a skid pipe, thereby reducing the workload and improving the furnace repair cycle. The present invention relates to a refractory block for a skid pipe of a heating furnace which greatly improves maintenance workability by extending, and a method of manufacturing the same.

In general, the hot-rolling furnace in the steelmaking process is a facility for heating the slab cast in the reproducing process to the temperature required for rolling, as shown in Figure 1 the slab (s) of the plurality of skid pipes 100 through which the coolant flows Moved by the forward, backward and vertical reciprocating motion, the slab (s) is supported on the skid pipe (100), the skid pipe (100) and the pillars 120 supporting it flow down from the high heat and slab (s) In order to prevent deterioration damage from the scale or the like, the surface of the pipe member 110 is constructed of a castable amorphous refractory 130.

In general, the construction work of the refractory 130 for the skid pipe of the heating furnace as described above, as shown in Figure 2, the anchor 123 and the ceramic wool on the outer peripheral surface of the pipe member 110 through which the coolant 112 is introduced ( After the construction of the first 125, and then install the mold 135 of the hollow-cylindrical cylindrical shape around it to inject and cast the castable refractory 130 by a pressure feeder to make a refractory block. However, such a conventional construction method is because the repair work in the heating furnace is made in a narrow and closed space to give the worker a burden on the working environment to reduce the efficiency.

In addition, the repair work of the furnace is generally carried out at a cycle of about 1 to 2 years, the refractory for the skid pipe 130 should be constructed to withstand a long time in the high temperature (about 1250 ℃) atmosphere in the furnace. However, in the conventional method as described above, it is difficult to secure sufficient curing and drying time for the construction refractory 130 due to the limitation of the repair period, and as shown in FIG. The refractories and cracks occur in the refractory 130, causing local refractory to fall off during use.

In addition, the ceramic wool 125 inserted into the middle portion of the castable refractory 130 and the skid pipe member 110 in order to secure the thermal insulation does not have a fixed shape due to the fragility and elasticity of the structural strength, Since there is little strength, it causes dimensional deviation during construction, and during long-term use, sintering and compression occur due to high temperature, thereby causing structural problems in the castable refractory 130. In particular, due to the difference in the coefficient of linear expansion between the ceramic wool and the ceramic wool such as 0.2% of the castable refractory 130 and 1% of the ceramic wool 125 at a temperature of 1200 ° C. in the furnace, As a result, oxidation occurs on the outer surface of the skid pipe member 110 and the anchors 123, and the refractory dropout occurs due to loss of support force due to loss of external stress.

As described above, the conventional refractory block for skid pipes and a construction method thereof have a high work load, increase cooling water temperature in the skid pipe member 110 due to dropping of the refractory 130, and cause operation instability. There was a problem of shortening the cost and causing a rise in cost.

The present invention is to solve the conventional problems as described above, it is possible to repair and repair the refractory block in a short time in a narrow space, and to prevent the refractory falling off due to structural spalling and anchor (ANCHOR) breakage occurring in the refractory block. It is an object of the present invention to provide a refractory block for a skid pipe of an improved furnace and a method of manufacturing the same to extend a repair cycle of a furnace to reduce costs and perform stable operation.

The present invention to achieve the above object,

delete

delete

In the manufacturing method of the refractory block to protect the skid pipe of the hot-rolling furnace in the steelmaking process, a plurality of anchors each having a semi-circular curvature arranged symmetrically to form a circle, and a plurality of anchors extending from the respective iron strips Preparing a tennis ball having stools; Forming a pair of insulating castable layers each having a semicircular cross-sectional structure in the fixture; Forming refractory semicircular members by molding heat-resistant castable layers that are integrally formed on the outer circumferential surface of the insulating castable layer; and mounting the refractory semicircular members to a skid pipe. By providing a method for producing a refractory block for the skid pipe of the furnace.

And the present invention is the step of mounting the refractory semicircular members to the skid pipe, forming a plurality of holes extending through the refractory semicircular members to the metal strip; and wrap the molded refractory semicircular members on the outer peripheral surface of the skid pipe And arranging and welding the steel strip and the skid pipe through the holes, thereby providing a method for manufacturing a refractory block for a skid pipe of a heating furnace.

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

The refractory block 1 for the skid pipe of the furnace according to the present invention is a refractory block for protecting the skid pipe member 110 of the hot rolled furnace in each steelmaking process as shown in FIG. The refractory block 1 of the present invention is made in advance of a plurality of refractory semicircular members 10 formed in two divisions, and the refractory semicircular members 10 are heat-resistant castables 30 and heat insulating castables 20. They have a semi-circular cross-sectional structure, each of which is a pair of insulating castable 20 layer and the outer peripheral surface of the insulating castable 20 layer that is interviewed on the outer circumferential surface of the skid pipe member 110, respectively. It is provided with a heat-resistant castable 30 layer formed integrally. And, extending from the plurality of iron strips 40 and the metal strips 40 respectively inserted into the inner circumferential surface of the insulating castable 20 layer, the insulating castable 20 layer and the heat-resistant castable 30 It has a fastener 50 having a plurality of anchors 45 that are inserted to firmly bind the bar 50, the fastener 50 is in the inner side of the insulating castable 20 in contact with the skid pipe member 110 The iron strip 40 will be installed.

In addition, the welded steel band 40 and the skid pipe member 110 through the hole 60 through the refractory semi-circular member 10, the hole 60 is the insulating castable 20 layer and The skid pipe member 110 penetrates the heat-resistant castable 30 layer and extends to the metal strip 40, and a welding rod is inserted therein to bond the metal strip 40 to the outer circumferential surface of the skid pipe member 110. To form a refractory block on the outer peripheral surface of the.

In the refractory block for the skid pipe member 110 of the present invention as shown in Figure 4, the heat-resistant castable 30 located on the outer side in contact with the atmosphere gas inside the furnace is generally a furnace skid pipe member ( Insulating castable 20 and steel strip 40 using the same material that is constructed in an indeterminate shape in the 110 and two blocks in which the welding hole 60 for fastening to the skid pipe member 110 is divided into two. It is formed through. The two welding parts are for attaching the refractory block to the skid pipe member 110 so as not to fall off, and the diameter of the welding hole 60 is 20 to 30 mm so that the welding rod can be inserted smoothly.

On the other hand, the insulating castable 20 is located inside the heat-resistant castable 30, the thermal conductivity at 1200 ° C is 0.2 ~ 0.4 Kcal to secure the thermal insulation effect on the cooling water inside the skid pipe member 110 Use / mh ℃. When using a material with a thermal conductivity higher than 0.4 Kcal / mh ° C., the coolant flowing inside the skid pipe member 110 may cause overheating, which may hinder operation. In general, when the thermal conductivity is lower than 0.2 Kcal / mh ° C., the strength is weak. . The thickness of the insulating castable 20 is preferably about 1/2 of the total thickness so that the strength of the construction body can be secured.

The iron strip 40 located on the inner side of the skid pipe member 110 is welded to the refractory support anchor 45 to integrate the entire refractory semicircular member 10. The anchor 45 is not particularly limited in shape using a general Y-type, V-type, T-type, etc., the length is preferably about 2/3 of the total thickness of the refractory for the skid pipe member 110. Also, when the block is fastened to the skid pipe member 110, a hole formed in the iron strip 40 to weld the surface of the skid pipe member 110 and the strip 40 using the welding machine 70 by using the welding hole 60. The diameter of the 60 is about 10 mm and after the welding is finished, the space for the welding hole 60 is closed by injecting the indentation refractory, as shown in FIG.

Hereinafter, a method for manufacturing a refractory block for a skid pipe of a heating furnace according to the present invention will be described.

The refractory block for skid pipe of the present invention is constructed in a heating furnace in a state in which water is completely removed through sufficient drying by making a block divided in advance using a mold (not shown). As shown in FIG. 4, first, a plurality of iron bands 40, each having a semi-circular curvature and symmetrically arranged to form a circle, and a plurality of anchors 45 extending from the respective bands 40 are formed. The step of providing a fixture 50 is provided, this step is to weld the anchor 45 to the metal strip 40 in advance to prepare a fixture 50 and then heat-resistant castable 30 and heat insulation castable ( 20) will be injected in advance to produce each.

And, forming a pair of insulating castable 20 layer having a semi-circular cross-sectional structure in each of the fasteners 50, and a heat-resistant keke integrally formed on the outer peripheral surface of the insulating castable 20 layer, respectively The refractory semicircular members 10 are formed by molding the sable 30 layer, and the refractory semicircular members 10 manufactured as described above are ceramic wool 125 and the castable 130 as in the related art. ), It is possible to produce much higher strength (more than 100 ℃ dry strength of 10kg / ㎠) as well as to make accurate jig than when it is installed directly in the furnace.

In addition, the thermally insulated castable 20 has a small difference in the coefficient of linear expansion with the heat-resistant castable 30 compared with the ceramic wool 125 and forms a dense construction body, so that the furnace gas penetrates into the refractory. By suppressing, oxidation and breakage of the anchor 45 are prevented.

And finally, when constructing the skid pipe refractory material of the present invention to the outside of the skid pipe member 110, to form a plurality of holes 60 extending through the refractory semi-circular member 10 to the metal strip 40 And wrapping the molded refractory semicircular members 10 on the outer circumferential surface of the skid pipe member 110 and welding the steel strip 40 and the skid pipe member 110 through the holes 60. Is done. These steps cover one of the two divided semi-circular members 10 outside the skid pipe member 110 as shown in FIG. 5 and use the welder 70 for the two welding holes 60 for the skid pipe member. The steel strip 40 is attached to (110) and welded. The other semi-circular member 10 is attached to the opposite side of the skid pipe member 110 so as to be symmetrical to the first constructed block, so that the work can be easily performed through the welding hole 60.

The welded semi-circular member 10 is simply injected with a heat insulating castable 20 through a small indenter, etc., between the welding holes 60 to block the inflow of the skid pipe member 110 through which the coolant flows and external heat. do.

This construction of the refractory block is repeated to the construction of the skid pipe member 110, as shown in Figure 6, the construction quality is excellent, even after prolonged elapsed due to thermal and mechanical impact or erosion damage to the scale It is possible to extend the repair cycle by about 1.5 times more than the conventional method.

According to the present invention as described above, by adopting the block construction method of the refractory for the heating furnace skid pipe, the construction method is simple, not only shorten the repair period of the furnace at least 2-3 days, but also improve the construction quality and insulation The application of the castable 20 can prevent the breakage of the anchor 45 and the fall off of the refractory damage to extend the furnace refractory repair cycle by about 1.5 times or more.

In addition, the conventional heating furnace refractory replacement repair work was performed in a high-temperature atmosphere and a narrow work space, but the working environment is very poor, safety accidents are prevented by the simple manufacturing method according to the present invention, and the service life of the refractory for skid pipe is improved. And cost reduction, as well as the effect of improving the working environment and reducing waste.

Claims (4)

delete delete In the manufacturing method of the refractory block to protect the skid pipe of the hot-rolled heating furnace in the iron-making process, each of the iron strips (40) having a semi-circular curvature arranged symmetrically arranged to form a circle, and each of the iron strips (40) Providing a fixture 50 having a plurality of anchors 45 extending therefrom; Molding a pair of insulating castable (20) layers each having a semicircular cross-sectional structure in the fixture (50); Shaping the refractory semicircular members 10 by forming a heat resistant castable 30 layer integrally formed on an outer circumferential surface of the insulating castable 20 layer; and skid refractory semicircular members 10. Mounting on the pipe member (110); Refractory block manufacturing method for a skid pipe of a heating furnace comprising a. 4. The method of claim 3, wherein the mounting of the refractory semicircular members 10 to the skid pipe member 110 comprises a plurality of holes 60 extending through the refractory semicircular members 10 to the metal strip 40. And forming and wrapping the molded refractory semicircular members 10 on the outer circumferential surface of the skid pipe member 110 and welding the iron strip 40 and the skid pipe member 110 through the holes 60. Refractory block manufacturing method for a skid pipe of a heating furnace characterized in that it comprises a.

Images