JP3161267B2 - Blast furnace shaft furnace inner wall repair method and repair support block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing abrasion and damage of a refractory of a blast furnace shaft portion by spraying an amorphous refractory (castable furnace material, hereinafter referred to as castable), particularly when the refractory is sprayed on a furnace inner wall. The present invention relates to a method for repairing a shaft portion of a blast furnace, which can surely hold a fixed refractory and greatly extend the life of a sprayed castable, and a support block used for the method.

[0002]

2. Description of the Related Art In a blast furnace having a cooling box system with a shaft portion, the bricks of the furnace are constantly spalled, collapsed, or dropped due to temperature fluctuations in the furnace, impacts due to erosive gases, or impacts, wear, etc. with the furnace age. Is placed in a state where The occurrence of such an environment not only affects the life of the blast furnace, but also has a great effect on the operation of the blast furnace. For this reason, from the point in time when the wear of the bricks has progressed to some extent, it is necessary to repair the shaft section profile to maintain stable operation and repair the furnace wall as a measure to extend the life of the blast furnace.

[0003] As a conventional general method of repairing a furnace wall, a method has been adopted in which a castable support is installed on a damaged or damaged portion of a brick, and the castable is sprayed to repair the damaged portion. Various proposals have been made for this castable support structure. Japanese Patent Application Laid-Open No. 54-15930 discloses this type of proposal.
No. 6 (method) and Japanese Utility Model Application Laid-Open No. Sho 59-178354 (Japanese Utility Model Application Publication No. Sho 63-15323). These are respectively as follows.

Japanese Patent Application Laid-Open No. 54-159306: A heat-resistant wire mesh is suspended from the front of a damaged furnace wall, and a mounting hole is previously formed in the furnace wall. A method of repairing the furnace wall by spraying with a long nozzle an amorphous refractory material that is fixed to the furnace wall and made to flow by adding water to the wire net. This is called the A method.

[0005] Japanese Utility Model Application Laid-Open No. Sho 59-178354; a number of refractory support members are protruded from the surface of a serpentine panel formed by bending a tube into a serpentine tube, and both ends of the serpentine panel are outside the furnace. Has a straight pipe part to protrude into and fix it to the steel skin,
A blast furnace shaft repair panel having a structure in which a cooling medium flows through the straight pipe portion. This is called the B number panel.

[0006]

In the above method (A), since the wire mesh has a weak mounting portion, the metal fittings of the wire mesh are sheared by the shearing force parallel to the furnace wall caused by the fall of the charge during the operation of the blast furnace. As a result, there is a problem that the spray material falls off together with the wire net at an early stage, and the life of the repaired part is extremely short.

[0007] In the device disclosed in Japanese Patent Application Laid-Open No. H11-157, the refractory support metal protrudingly provided on the surface of the flexible tube is not able to withstand the above-mentioned shearing force and cuts off. There is a problem.

[0008]

The present invention solves the above problems by the following method and support block.

[0009] The method is to cool the place where the furnace wall is to be repaired.
One or more support blocks cooled by the refrigerant are arranged on the body , and the ends of the refrigerant inflow pipe and the discharge pipe are taken out of the furnace from the holes opened in the blast furnace steel shell, and fixed to the blast furnace steel shell,
After that, a furnace wall is formed by spraying an indefinite refractory furnace material into the upper refractory material deficient space of the support block.

[0010] The support block used in the above-mentioned method is formed by casting a cooling pipe in a rectangular parallelepiped block, projecting both ends of the cooling pipe from the block, and using one as a refrigerant inlet pipe and the other as a discharge pipe. Forming and further on the block
That protrusions are formed at intervals in the length direction of the surface.
Which is characterized by forming at an interval of protrusions on top of the block, it is possible to more firmly fix the spraying material, also prevents the falling off into the furnace.

[0011]

According to the present invention, a rectangular support block in which a cooling pipe is cast is used. The support block is arranged on the upper surface of the cooling plate at the location where the refractory of the furnace wall is missing. Since the fixing member is fixedly mounted on the fixing member, the spraying material for repair can be reliably supported for a long period of time. Further, the refractory material sprayed through the block can be cooled to extend its life. If the protrusions are formed at intervals on the upper surface of the block, the contact area with the spray material increases, and the adhesive force between the spray material and the block increases. Further, the projections prevent the spraying material from moving, and prevent the spraying material from falling in the furnace.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail. FIG. 1 is a perspective view of a support block for a sprayed indefinite refractory used in the method of the present invention. In FIG. 1, reference numeral 10 denotes a support block, and reference numeral 11 denotes a substantially rectangular parallelepiped block, the long sides of which are formed to substantially match the curvature of the furnace wall to be repaired. As the material, spheroidal graphite cast iron, copper casting or the like having good thermal conductivity is used. And inside this rectangular block,
The cooling pipe 13 is inserted along the long side direction. The cooling pipe 13 is bent into a U-shape, a part 13a of which is located inside the block 11, and the remaining part protrudes substantially perpendicularly from the rear surface of the block. One protruding portion is a cooling medium inflow pipe 13b, and the other is a discharge pipe 13c. As the cooling pipe 13, a steel pipe or a copper pipe is used. In addition, it is preferable that the part cast inside the block 11 be a double pipe in consideration of melting of the outer wall of the cooling pipe at the time of casting. As shown in the figure, it is preferable to form protrusions 12 on the upper surface of the block 11 at intervals in the long side direction thereof in order to increase the bonding strength with the spray material and prevent the block from falling into the furnace. Projection 12
The shape of is preferably a cube, a rectangular parallelepiped, or a head-cut bank.

Next, a method of attaching the support block 10 to the blast furnace shell will be described with reference to FIG. 1 is a steel shell of a shaft portion of a blast furnace, 2 is a worn lining refractory brick, and 3 is a cooling body (cooling plate or cooling cylinder). First, the wind level is reduced and the charge level is reduced to the repair location. Holes for passing the inflow pipe 13b and the discharge pipe 13c are formed on the steel cooling plate 3 at each repair location. A reinforcing ring 6 is attached at the position of the hole, and a guide pipe 5 for guiding and supporting the inflow pipe 13b and the discharge pipe 13c is provided on the inner surface of the steel shell. The support block 10 is hung down from a furnace manhole or the like, drawn to the repaired portion, and the inflow pipe 13 b and the discharge pipe 13 c are connected to the guide pipe 5.
And fix it. After the mounting of the support block at each repair location is completed, a blowing material is sprayed from the inside of the furnace to a brick-deficient space on the support block 10 to bury and repair the furnace wall. The inflow pipe 13b is connected to a water supply pipe of a cooling plate (not shown) around the shaft or a newly installed water supply pipe (or another refrigerant supply pipe), and the discharge pipe 13c is connected to a cooling water discharge pipe of a cooling body (not shown) or Connected to the newly installed discharge pipe. The present invention can be performed without cutting off the skin as described above.

FIG. 2 shows a state in which the support block of the present invention is disposed on a cooling plate 3a which is a normal cooling body. Also,
Recently, a technique has been practiced in which a furnace wall is formed by spraying and lining a non-standard refractory with a refractory material lining a shaft portion instead of a conventional molded refractory brick. In this case, the cooling cylinder 3b is used as a cooling body. This example is shown in FIG. Also in the example of FIG. 2 and FIG. 3, the support block 10 has a long side length of two cooling plates 3a or
The length spans the cooling cylinder 3b.

In the above example, the case where the support block 10 according to the present invention is applied to a blast furnace in operation has been described. However, if the support block 10 is previously mounted on a cooling plate of a shaft portion when a blast furnace is newly installed or renovated, the furnace wall refractory brick can be used. The effect of extending the life of the device can be expected.

When the support block of the present invention was used for repairing the furnace wall of an actual blast furnace, the conventional refractory, which was simply sprayed with only 3 to 6 months, was significantly extended to one year or more. It was confirmed that it was possible.

[0017]

According to the method and the support block of the present invention, since the sprayed refractory is cooled, the support block is fixed to the steel shell and supported by the cooling plate, the life of the sprayed refractory can be extended. In addition, the effect of stabilizing the operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a support block for sprayed indefinite refractory used in the method of the present invention.

FIG. 2 is a front view from the inside of the furnace showing a state where the support block of the present invention is attached to a blast furnace shaft portion of a normal lining brick.

FIG. 3 is a front view from the inside of the furnace, showing a state in which the support block of the present invention is attached to a blast furnace shaft forming a furnace wall with an irregular refractory.

FIG. 4 is a partial longitudinal sectional view showing a state where the support block of the present invention is attached to a blast furnace shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron shell 2 Molded refractory brick 3 Cooling body 3a Cooling plate 3b Cooling cylinder 5 Guide pipe 10 Support block 11 Block 12 Projection 13a Cooling pipe 13b Inflow pipe 13c Discharge pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) C21B 7/06 C21B 7/10 F27D 1/12 F27D 1/16

Claims (2)

(57) [Claims] 1. A hole in which one or a plurality of support blocks cooled by a refrigerant are arranged on a cooling body at a place where a furnace wall is to be repaired, and ends of the refrigerant inlet pipe and the discharge pipe are opened in a blast furnace steel shell. A blast furnace, wherein the furnace wall is formed by spraying an irregular-shaped refractory material into the upper refractory material-deficient space of the support block and burying the furnace wall. How to repair the shaft furnace inner wall. Wherein insert casting a cooling tube inside a box-shaped blocks, with both ends of the cooling pipes protrude from the block to form one inlet pipe of the refrigerant, as the other exhaust pipe, and
In addition, the protrusions are spaced apart in the length direction of the
A support block for repairing a blast furnace shaft portion, the support block being formed.