Blast furnace gutter and construction method of blast furnace gutter

Abstract

To provide a blast furnace gutter that prevents opening in a joint between fire-resisting block members, thereby preventing a molten matter such as molten metal or slag from penetrating the joint, and also prevents the molten mater from leaking outside the gutter even when the molten matter has penetrated the joint.SOLUTION: A blast furnace gutter 1 including plural fire-resisting block members arrayed in a line includes: a groove-shaped first layer 2 formed by joining plural fire-resisting block members 20 in a line; a groove-shaped second layer 3 formed by plural joining fire-resisting block members 30 in a line above the first layer 2; and a locking part 4 that defines relative positions of the first layer 2 and of the second layer 3 in a longitudinal direction. A position of a joined part 24 of the fire-resisting block members 20 in the first layer 2 and a position of a joined part 34 of the fire-resisting block members 30 in the second layer 3 are displaced from each other in the longitudinal direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blast furnace trough having a groove-like melting passage formed by arranging a plurality of refractory block members in a row, and a method for constructing the same. [Background technology]

[0002] As conventional blast furnace troughs, for example, those manufactured by a precast method are known, as shown in the following Patent Documents 1 to 3. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-077167 A [Patent Document 2] JP 2014-077168 A [Patent Document 3] Japanese Patent Application Publication No. 08-001310 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Documents 1 and 2, the use of refractory block members in the blast furnace trough reduces labor and increases durability, and the refractory block members are divided into left and right sides in the direction of molten material flow, and the joint surfaces of the refractory block members are arranged discontinuously to reduce damage to the joints. However, the joint surfaces in the direction of molten material flow are prone to opening when cooled after operation has ended, making it difficult to use the structure multiple times. In addition, the increased number of joints increases the risk of low-viscosity molten material, such as molten pig iron, penetrating the joints when the material passes through.

[0005] On the other hand, in Patent Document 3, small bricks are connected by inserting bricks to prevent gaps from opening. However, if the inserting brick in contact with the molten material is damaged by erosion or the like, there is a high risk of gaps opening and the molten material entering the gaps.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a blast furnace runner that prevents the opening of joints between refractory block components, prevents molten materials such as molten metal and slag from entering the joints, and prevents the molten material from leaking out of the runner even if it does enter the joints. [Means for solving the problem]

[0007] The features of the blast furnace runner according to the present invention are as follows: A blast furnace trough having a plurality of refractory block members arranged in a row, a groove-shaped first layer formed by joining a plurality of the refractory block members in a row; a groove-shaped second layer formed by joining a plurality of the refractory block members in a row on the first layer; a locking portion that defines a relative position of the first layer and the second layer in a longitudinal direction; The position of the joint portion of the refractory block members in the first layer and the position of the joint portion of the refractory block members in the second layer are offset from each other in the longitudinal direction.

[0008] In the blast furnace trough according to the present invention, it is preferable that the locking portion is constituted by a recess provided on one of the first layer refractory block member and the second layer refractory block member, and a protrusion provided on the other.

[0009] In the blast furnace trough according to the present invention, it is preferable that one of the recessed portion and the protruding portion is divided into two of the refractory block members.

[0010] In the blast furnace trough according to the present invention, it is preferable that at least one of a step and an inclined surface is formed at a joint portion of the refractory block members of the second layer.

[0011] In the blast furnace trough according to the present invention, it is preferable that the locking portion of the second layer is provided on at least one of an outer side surface and an outer bottom surface of the second layer.

[0012] In the blast furnace trough according to the present invention, it is preferable that the locking portion is configured to include a locking refractory member that can be engaged across both the first layer and the second layer.

[0013] The features of the construction method for a blast furnace trough according to the present invention are as follows: The above-mentioned blast furnace trough construction method, forming a groove-shaped first layer by joining a plurality of refractory block members in a row; forming a groove-shaped second layer on the first layer by joining a plurality of refractory block members in a row; The first layer and the second layer are engaged with each other while the positions of the joints of the fire-resistant block members in the first layer and the second layer are offset from each other in the longitudinal direction. Effect of the Invention

[0014] According to the present invention, since the positions of the joints of the refractory block members in the first layer and the positions of the joints of the refractory block members in the second layer are offset from each other in the longitudinal direction, even if a molten material is inserted into the refractory block member of the second layer, it can be held in place by the refractory block member of the first layer. Furthermore, by providing a locking portion that defines the relative positions of the first layer and the second layer in the longitudinal direction, it is possible to prevent joints from opening at the joints of the refractory block members in each of the first and second layers. As a result, even in a blast furnace runner that has once stopped operating and been cooled, joints do not open between the refractory block members, and the risk of leakage of molten material such as pig iron can be significantly reduced. Furthermore, since it can be operated again without repair, it is possible to reduce the repair work period, workload, and refractory consumption. Furthermore, if there is no damage to the refractory block member of the first layer, it is possible to reduce the repair workload and refractory consumption by replacing only the refractory block member of the second layer. [Brief description of the drawings]

[0015] [Figure 1] FIG. [Diagram 2] FIG. 2 is a schematic diagram of a vertical cross section of a blast furnace trough as viewed from the direction in which the molten material flows. [Diagram 3] FIG. 2 is a schematic diagram of a longitudinal cross section of a blast furnace trough along its longitudinal direction. [Figure 4] FIG. 4 is a schematic diagram of a longitudinal cross section along the longitudinal direction of a blast furnace trough according to another embodiment. [Diagram 5] FIG. 4 is a schematic diagram of a longitudinal cross section along the longitudinal direction of a blast furnace trough according to another embodiment. [Figure 6] FIG. 4 is a schematic configuration diagram of a plane of a blast furnace trough according to another embodiment. [Figure 7] FIG. 4 is a schematic diagram of a vertical cross section of a blast furnace trough according to another embodiment when viewed from the direction in which the molten material flows. [Figure 8] FIG. 4 is a schematic diagram of a longitudinal cross section along the longitudinal direction of a blast furnace trough according to another embodiment. [Figure 9] FIG. 4 is a schematic configuration diagram of a plane of a blast furnace trough according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (Blast furnace trough) An embodiment of a blast furnace runner 1 according to the present invention will be described with reference to the drawings. 1 and 2, the blast furnace runner 1 according to this embodiment is a blast furnace runner 1 comprising a plurality of refractory block members arranged in a row, and comprises a groove-shaped first layer 2 formed by joining a plurality of first refractory block members 20 in a row, and a groove-shaped second layer 3 formed by joining a plurality of second refractory block members 30 in a row on the first layer 2. A groove-shaped molten metal passage 35 is formed in the longitudinal direction of the second layer 3.

[0017] The first refractory block member 20 constituting the first layer 2 includes a bottom 21, a right side wall portion 22 erected on the right end side of the bottom 21, and a left side wall portion 23 erected on the left end side of the bottom 21, and has a generally U-shaped vertical cross section. As in this embodiment, it is desirable that the inner surface of the right side wall portion 22 and the inner surface of the left side wall portion 23 of the first refractory block member 20 be inclined so that their widths become narrower toward the bottom 21 side.

[0018] The second refractory block member 30 constituting the second layer 3 includes a bottom 31, a right side wall 32 erected on the right end side of the bottom 31, and a left side wall 33 erected on the left end side of the bottom 31, and has a generally U-shaped vertical cross section. As in this embodiment, it is desirable that the inner surface of the right side wall 32 and the inner surface of the left side wall 33 are inclined so that the width becomes narrower toward the bottom 31 side.

[0019] The second refractory block member 30 is designed in such a way that it can be fitted inside the first refractory block member 20, and the outer surface of the right side wall portion 32, the outer surface of the left side wall portion 33, and the outer bottom surface of the second refractory block member 30 are in close contact with the inner surface of the right side wall portion 22, the inner surface of the left side wall portion 23, and the bottom 21 of the first refractory block member 20. Therefore, when the inner surface of the right side wall portion 22 and the inner surface of the left side wall portion 23 of the first refractory block member 20 are inclined so that their widths become narrower toward the bottom 21 side as in this embodiment, the outer surface of the right side wall portion 32 and the outer surface of the left side wall portion 33 of the second refractory block member 30 also become inclined surfaces that are inclined so that their widths become narrower toward the outer bottom surface side.

[0020] The blast furnace runner 1 in this embodiment has a locking portion 4 that determines the relative positions of the first layer 2 and the second layer 3 in the longitudinal direction, thereby fixing the position of the second layer 3 relative to the first layer 2 in the longitudinal direction.

[0021] In this embodiment, the locking portion 4 is composed of recesses 40, 42 provided on one of the first refractory block member 20 and the second refractory block member 30, and protrusions 41, 43 provided on the other. In addition, the protrusions are divided into two refractory block members to be joined.

[0022] 3, the first refractory block members 20 have a recess 40 in the middle with the joint portion 24 as both ends, and a portion of a protrusion 41 on each of the both ends, and by joining the first refractory block members 20 together, the protrusion 41 is formed at the joint portion 24. Similarly, the second refractory block members 30 have a recess 42 in the middle with the joint portion 34 as both ends, and a portion of a protrusion 43 on each of the both ends, and by joining the second refractory block members 30 together, the protrusion 43 is formed at the joint portion.

[0023] In this case, the locking portion 4 is configured to include a first locking portion configured to allow engagement between a recess 40 provided on the first fire-resistant block member 20 and a protrusion 43 provided on the second fire-resistant block member 30, and a second locking portion configured to allow engagement between a protrusion 41 provided on the first fire-resistant block member 20 and a recess 42 provided on the second fire-resistant block member 30.

[0024] Although not shown, the configuration of the first refractory block member 20 and the second refractory block member 30 is not limited to the above-mentioned form, and may be configured such that the joint portions are both ends, a convex portion is provided in the middle portion, and a portion of a concave portion is provided in each of the both end portions, and a concave portion is formed at the joint portion by joining a plurality of the first refractory block members 20 and the second refractory block members 30. In this case as well, the locking portion 4 is configured to include a first locking portion configured so that the concave portion provided in the refractory block member of the first layer 2 can be engaged with the convex portion provided in the refractory block member of the second layer 3, and a second locking portion configured so that the convex portion provided in the refractory block member of the first layer 2 can be engaged with the concave portion provided in the refractory block member of the second layer 3.

[0025] In the embodiment shown in Fig. 3, the joint 34 of the second refractory block member 30 is a vertical surface, but the present invention is not limited to this configuration, and for example, a step may be formed at the joint 34 of the second refractory block member 30 as shown in Fig. 4, or an inclined surface may be formed at the joint 34 of the second refractory block member 30 as shown in Fig. 5. By forming a step or an inclined surface at the joint in this manner, floating due to the flow of molten iron is less likely to occur, and displacement of the second refractory block member 30 can be prevented.

[0026] In the above-described embodiment, the recess 42 and the protrusion 43 provided in the second refractory block member 30 are provided on the outer bottom surface of the second refractory block member 30, and the recess 40 and the protrusion 41 provided in the first refractory block member 20 are provided on the upper surface of the bottom 21 of the first refractory block member 20, but this configuration is not limited to this.

[0027] 6, for example, a configuration may be adopted in which a recess 42 and a protrusion 43 are provided on the outer surface of the second refractory block member 30, i.e., the outer surface of the right side wall portion 32 and the outer surface of the left side wall portion 33 of the second refractory block member 30, and a recess 40 and a protrusion 41 are provided on the inner surface of the right side wall portion 22 and the inner surface of the left side wall portion 23 of the first refractory block member 20. In other words, a configuration may be adopted in which the recess 42 or the protrusion 43 provided on the second refractory block member 30 is provided on at least one of the outer surface and the outer bottom surface of the second refractory block member 30 (it goes without saying that the recess 40 or the protrusion 41 on the first refractory block member 20 is provided to correspond to the recess 42 or the protrusion 43 on the second refractory block member 30).

[0028] As shown in Figures 7 to 9, the locking portion 4 is not limited to the above-mentioned embodiment, and may be configured, for example, to include a locking fire-resistant member 5 that can engage with both the first layer 2 and the second layer 3.

[0029] In this embodiment, the first refractory block member 20 is formed with a recess 40. The second refractory block member 30 is configured such that the joint portion 34 is the both ends, a protrusion 43 is provided in the middle portion, and a part of the recess 42 is provided in each of the both end portions. By joining a plurality of the second refractory block members 30, the recess 42 is formed at the joint portion 34. The recess 40 in the first refractory block member 20 and the recess 42 in the second refractory block member 30 are configured to form an accommodation space S for accommodating the locking refractory member 5. By providing the locking refractory member 5 across both the first refractory block member 20 and the second refractory block member 30, the position of the second layer 3 relative to the first layer 2 in the longitudinal direction is fixed. According to this configuration, the locking refractory member 5 is provided between the first refractory block member 20 of the first layer 2 and the second refractory block member 30 of the second layer 3, and since the locking refractory member 5 does not directly contact the molten material, it is unlikely to be damaged by erosion or the like. As shown in FIG. 9, if a gap is generated after the locking fireproof member 5 is accommodated in the accommodation space S, the gap may be filled with a filler 6 such as mortar.

[0030] In the embodiment shown in Figures 7 to 9, a configuration is shown in which the locking fire-resistant member 5 is provided on both the outer side surface and the outer bottom surface of the second fire-resistant block member 30, but this configuration is not limited to this, and the locking fire-resistant member 5 may be provided on at least one of the outer side surface and the outer bottom surface of the second fire-resistant block member 30.

[0031] Examples of main raw materials that can be used for the first refractory block member 20, the second refractory block member 30, and the locking refractory member 5 include silica-alumina-based raw materials or MgO-Al 2 O 3 Examples of the raw material include, but are not limited to, a spinel raw material, a silicon carbide raw material, etc. Furthermore, various additives such as various binders, dispersants, curing time regulators, anti-explosion agents, antioxidants, etc. may be used as necessary.

[0032] The above-mentioned refractory block member and the locking refractory member can be manufactured by a known refractory manufacturing method including a raw material crushing step, a mixing / kneading step, a molding step, a drying / heat treatment step, a firing step, and a processing / finishing step.

[0033] (Construction method of blast furnace trough) The construction method of the blast furnace trough 1 in the above-mentioned embodiment includes a step of forming a groove-shaped first layer 2 by joining a plurality of first refractory block members 20 in a row, and a step of forming a groove-shaped second layer 3 on the first layer 2 by joining a plurality of second refractory block members 30 in a row, In the process of forming the second layer 3, the position of the joint portion 24 of the first refractory block member 20 and the position of the joint portion 34 of the second refractory block member 30 are shifted from each other in the longitudinal direction, while the second layer 3 is engaged with the first layer 2 via the engaging portion 4.

[0034] Other embodiments 1. The blast furnace trough in the above-described embodiment is configured to include a first layer and a second layer, but is not limited to this configuration, and may be configured to include further layers as necessary, such as a third layer, a fourth layer, etc.

[0035] 2. The construction method of the blast furnace trough according to the present invention is not limited to the above-mentioned embodiment, and may be, for example, a plurality of combinations of the refractory block members constituting the first layer and the refractory block members constituting the second layer may be prepared in advance, and the combinations may be joined together in the longitudinal direction at the site. This construction method also includes forming a groove-shaped first layer by joining a plurality of refractory block members in a row, and forming a groove-shaped second layer by joining a plurality of refractory block members in a row on the first layer.

[0036] Although the present invention has been described with reference to the drawings as described above, the present invention is not limited to the configuration of the drawings, and can be embodied in various forms without departing from the gist of the present invention. [Industrial Applicability]

[0037] The blast furnace runner according to the present invention can be suitably used as a slag runner, molten metal runner, tilting runner, main runner, etc., as a path for transporting molten metal, molten slag, etc. [Explanation of symbols]

[0038] 1 Blast furnace trough 2 First layer 20 First refractory block member 21 Bottom 22 Right side wall 23 Left side wall 24 Joint part 3 Second layer 30 Second fire-resistant block member 31 Bottom 32 Right side wall 33 Left side wall 34 Joint part 35 Molten metal passage 4 Locking part 40 Recess of first refractory block member 41 Convex portion of first refractory block member 42 Recess of second refractory block member 43 Convex portion of second refractory block member 5. Fireproof fastening members 6 Filling material S Storage space

Claims

1. A blast furnace trough having a plurality of refractory block members arranged in a row, a groove-shaped first layer formed by joining a plurality of the refractory block members in a row; a groove-shaped second layer formed by joining a plurality of the refractory block members in a row on the first layer; a locking portion that defines a relative position of the first layer and the second layer in a longitudinal direction; A blast furnace trough, in which the positions of joints of the refractory block members in the first layer and the positions of joints of the refractory block members in the second layer are offset from each other in the longitudinal direction.

2. 2. The blast furnace trough according to claim 1, wherein the engaging portion is constituted by a recess provided on one of the first layer refractory block member and the second layer refractory block member, and a protrusion provided on the other.

3. The blast furnace trough according to claim 2 , wherein one of the recessed portion and the protruding portion is divided into two of the refractory block members.

4. 4. The blast furnace trough according to claim 3, wherein at least one of a step and an inclined surface is formed at a joint portion of the refractory block members of the second layer.

5. The blast furnace trough according to any one of claims 2 to 4, wherein the engaging portion of the second layer is provided on at least one of an outer side surface and an outer bottom surface of the second layer.

6. 2. The blast furnace trough according to claim 1, wherein the locking portion is configured to include a locking refractory member that is engageable across both the first layer and the second layer.

7. A method for constructing a blast furnace trough according to claim 1, forming a groove-shaped first layer by joining a plurality of refractory block members in a row; forming a groove-shaped second layer on the first layer by joining a plurality of refractory block members in a row; A construction method for a blast furnace trough, in which the first layer and the second layer are engaged with each other while shifting the positions of the joints of the refractory block members in the first layer and the positions of the joints of the refractory block members in the second layer from each other in the longitudinal direction.

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